# Questionnaire

A step-by-step form that shows one question at a time, with choices, text answers, validation, skipping and a submit step.

Questionnaire is an open-source mobile component from suiss/uim for React Native and Expo, with SwiftUI and Jetpack Compose versions built from the same design tokens. The @esuiss/uim CLI copies its source into your project, so you own the code.

Source: https://uim.suiss.app/docs/components/questionnaire

![Preview](https://uim.suiss.app/previews/components-questionnaire--default.light.webp)

```tsx
import * as React from "react"
import { View } from "react-native"
import { Questionnaire, QuestionnaireActions, QuestionnaireChoice, QuestionnaireChoices, QuestionnaireDescription, QuestionnaireError, QuestionnaireInput, QuestionnaireItem, QuestionnaireNext, QuestionnairePrevious, QuestionnaireProgress, QuestionnaireSkip, QuestionnaireSubmit, QuestionnaireTitle, type QuestionnaireValues } from "@/components/ui/questionnaire"
import { Text } from "@/components/ui/text"

function Actions() {
  return (
    <QuestionnaireActions>
      <QuestionnairePrevious />
      <QuestionnaireSkip />
      <QuestionnaireNext />
      <QuestionnaireSubmit />
    </QuestionnaireActions>
  )
}

function Result({ values }: { values: QuestionnaireValues | null }) {
  if (!values) return null
  return (
    <Text role="status" className="text-sm text-label-secondary">
      {`Submitted: ${JSON.stringify(values)}`}
    </Text>
  )
}

function Onboarding({
  defaultItem,
  attempted = false,
}: {
  defaultItem?: string
  attempted?: boolean
}) {
  const [values, setValues] = React.useState<QuestionnaireValues | null>(null)
  return (
    <View className="w-full gap-4">
      <Questionnaire defaultItem={defaultItem} onSubmit={setValues}>
        <QuestionnaireProgress />
        <QuestionnaireItem name="role" required invalid={attempted}>
          <QuestionnaireTitle>
            What best describes your role?
          </QuestionnaireTitle>
          <QuestionnaireDescription>
            This helps us tailor the setup to your team.
          </QuestionnaireDescription>
          <QuestionnaireChoices>
            <QuestionnaireChoice value="engineering">
              Engineering
            </QuestionnaireChoice>
            <QuestionnaireChoice value="design">Design</QuestionnaireChoice>
            <QuestionnaireChoice value="product">Product</QuestionnaireChoice>
            <QuestionnaireChoice value="other">
              Something else
            </QuestionnaireChoice>
          </QuestionnaireChoices>
          <QuestionnaireError />
        </QuestionnaireItem>
        <QuestionnaireItem name="team-size">
          <QuestionnaireTitle>How large is your team?</QuestionnaireTitle>
          <QuestionnaireChoices>
            <QuestionnaireChoice value="solo">Just me</QuestionnaireChoice>
            <QuestionnaireChoice value="small" defaultChecked>
              2 to 10 people
            </QuestionnaireChoice>
            <QuestionnaireChoice value="medium">
              11 to 50 people
            </QuestionnaireChoice>
            <QuestionnaireChoice value="large">
              More than 50 people
            </QuestionnaireChoice>
          </QuestionnaireChoices>
          <QuestionnaireError />
        </QuestionnaireItem>
        <QuestionnaireItem name="company" required>
          <QuestionnaireTitle>What is your company called?</QuestionnaireTitle>
          <QuestionnaireInput placeholder="Acme Inc." />
          <QuestionnaireError>
            Enter a company name to continue.
          </QuestionnaireError>
        </QuestionnaireItem>
        <Actions />
      </Questionnaire>
      <Result values={values} />
    </View>
  )
}

export function QuestionnaireExample() {
  return (
    <Onboarding />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QuestionnaireStoryActions: View {
  var body: some View {
    QuestionnaireActions {
      QuestionnairePrevious()
      QuestionnaireSkip()
      QuestionnaireNext()
      QuestionnaireSubmit()
    }
  }
}

struct QuestionnaireOnboarding: View {
  var attempted = false

  @State private var controller: QuestionnaireController
  @State private var submitted: String?

  init(defaultItem: String? = nil, attempted: Bool = false) {
    self.attempted = attempted
    _controller = State(initialValue: QuestionnaireController(
      defaultItem: defaultItem,
      defaultValues: ["team-size": ["small"]]
    ))
  }

  var body: some View {
    VStack(alignment: .leading, spacing: 16) {
      Questionnaire(controller: controller) {
        QuestionnaireProgress()
        QuestionnaireItem(name: "role", required: true, invalid: attempted) {
          QuestionnaireTitle("What best describes your role?")
          QuestionnaireDescription("This helps us tailor the setup to your team.")
          QuestionnaireChoices {
            QuestionnaireChoice("Engineering", value: "engineering")
            QuestionnaireChoice("Design", value: "design")
            QuestionnaireChoice("Product", value: "product")
            QuestionnaireChoice("Something else", value: "other")
          }
          QuestionnaireError()
        }
        QuestionnaireItem(name: "team-size") {
          QuestionnaireTitle("How large is your team?")
          QuestionnaireChoices {
            QuestionnaireChoice("Just me", value: "solo")
            QuestionnaireChoice("2 to 10 people", value: "small")
            QuestionnaireChoice("11 to 50 people", value: "medium")
            QuestionnaireChoice("More than 50 people", value: "large")
          }
          QuestionnaireError()
        }
        QuestionnaireItem(name: "company", required: true) {
          QuestionnaireTitle("What is your company called?")
          QuestionnaireInput("Acme Inc.")
          QuestionnaireError("Enter a company name to continue.")
        }
        QuestionnaireStoryActions()
      }
      if let submitted {
        Text(verbatim: submitted)
          .textStyle(.sm)
          .foregroundStyle(Color.labelSecondary)
          .accessibilityAddTraits(.updatesFrequently)
      }
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .onAppear {
      let controller = controller
      controller.onSubmit = { answers in
        let fields = controller.sequence.compactMap { name -> String? in
          guard let value = answers[name]?.first else { return nil }
          return "\"\(name)\":\"\(value)\""
        }
        submitted = "Submitted: {\(fields.joined(separator: ","))}"
      }
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Questionnaire
import com.esuiss.ui.components.QuestionnaireActions
import com.esuiss.ui.components.QuestionnaireChoice
import com.esuiss.ui.components.QuestionnaireChoices
import com.esuiss.ui.components.QuestionnaireDescription
import com.esuiss.ui.components.QuestionnaireError
import com.esuiss.ui.components.QuestionnaireInput
import com.esuiss.ui.components.QuestionnaireItem
import com.esuiss.ui.components.QuestionnaireNext
import com.esuiss.ui.components.QuestionnairePrevious
import com.esuiss.ui.components.QuestionnaireProgress
import com.esuiss.ui.components.QuestionnaireSkip
import com.esuiss.ui.components.QuestionnaireSubmit
import com.esuiss.ui.components.QuestionnaireTitle
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.rememberQuestionnaireState
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

fun questionnaireJson(values: Map<String, List<String>>): String =
    values.entries.joinToString(",", "{", "}") { (key, list) ->
        "\"$key\":" + list.joinToString(",", "[", "]") { "\"$it\"" }
    }

@Composable
fun QuestionnaireActionsRow() {
    QuestionnaireActions {
        QuestionnairePrevious()
        QuestionnaireSkip()
        QuestionnaireNext()
        QuestionnaireSubmit()
    }
}

@Composable
fun QuestionnaireResult(values: String?) {
    if (values == null) return
    Text(
        "Submitted: $values",
        modifier = Modifier.semantics { liveRegion = LiveRegionMode.Polite },
        style = Typography.sm,
        color = EsuissTheme.colors.labelSecondary,
    )
}

@Composable
fun QuestionnaireOnboarding(defaultItem: String? = null, attempted: Boolean = false) {
    var values by rememberSaveable { mutableStateOf<String?>(null) }
    val state = rememberQuestionnaireState(defaultItem = defaultItem)
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Questionnaire(state = state, onSubmit = { values = questionnaireJson(it) }) {
            QuestionnaireProgress()
            QuestionnaireItem(name = "role", required = true, invalid = attempted) {
                QuestionnaireTitle("What best describes your role?")
                QuestionnaireDescription("This helps us tailor the setup to your team.")
                QuestionnaireChoices {
                    QuestionnaireChoice("Engineering", value = "engineering")
                    QuestionnaireChoice("Design", value = "design")
                    QuestionnaireChoice("Product", value = "product")
                    QuestionnaireChoice("Something else", value = "other")
                }
                QuestionnaireError()
            }
            QuestionnaireItem(name = "team-size") {
                QuestionnaireTitle("How large is your team?")
                QuestionnaireChoices {
                    QuestionnaireChoice("Just me", value = "solo")
                    QuestionnaireChoice("2 to 10 people", value = "small", defaultChecked = true)
                    QuestionnaireChoice("11 to 50 people", value = "medium")
                    QuestionnaireChoice("More than 50 people", value = "large")
                }
                QuestionnaireError()
            }
            QuestionnaireItem(name = "company", required = true) {
                QuestionnaireTitle("What is your company called?")
                QuestionnaireInput(placeholder = "Acme Inc.")
                QuestionnaireError("Enter a company name to continue.")
            }
            QuestionnaireActionsRow()
        }
        QuestionnaireResult(values)
    }
}
```

`Questionnaire` is a `View` that tracks which question is active, collects answers and validates them. Each `QuestionnaireItem` is one question; only the active item is shown, and moving between items slides the content horizontally with a Reanimated keyframe that follows the layout direction.

Items hold `QuestionnaireChoice` rows, which are `Pressable` radios or, with `multiple`, checkboxes, or a `QuestionnaireInput` for a typed answer. `QuestionnaireActions` holds the Previous, Skip, Next and Submit buttons, each of which only appears when it applies.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add questionnaire
```

```bash title="Terminal"
npx @esuiss/uim@latest add questionnaire --platform swift
```

```bash title="Terminal"
npx @esuiss/uim@latest add questionnaire --platform kotlin
```

The CLI also adds what it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Text](/docs/components/text).

### Manual

**Uniwind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`, `components/primitives/hooks.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/ui/questionnaire.tsx`:

```tsx title="uniwind/components/ui/questionnaire.tsx"
import { cn } from "cn"
import { CheckIcon } from "phosphor-react-native"
import * as React from "react"
import {
  type GestureResponderEvent,
  I18nManager,
  Pressable,
  View,
} from "react-native"
import Animated, { Keyframe, ReduceMotion } from "react-native-reanimated"
import { useHaptics } from "@/components/primitives/haptics"
import { useEffectEvent } from "@/components/primitives/hooks"
import { resolveClassName } from "@/components/primitives/use-render"
import { Button, type ButtonProps } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { Text, TextClassContext } from "@/components/ui/text"

type QuestionnaireItemStatus = "unanswered" | "answered" | "skipped"

type QuestionnaireItemDefinition = {
  name: string
  required?: boolean
  disabled?: boolean
}

type QuestionnaireValues = Record<string, string | string[]>

type QuestionnaireState = {
  current: number
  first: boolean
  last: boolean
  total: number
}

type QuestionnaireDirection = "forward" | "backward"

type QuestionnaireAnswer = { choices: string[]; text: string }

type ItemRecord = {
  name: string
  required: boolean
  disabled: boolean
  invalid: boolean
  multiple: boolean
}

type QuestionnaireInputType =
  | "text"
  | "email"
  | "number"
  | "tel"
  | "url"
  | "password"
  | "search"

type QuestionnaireContextValue = QuestionnaireState & {
  activeItemName: string | null
  activeItemRequired: boolean | null
  shownItemName: string | null
  direction: QuestionnaireDirection
  animated: boolean
  values: QuestionnaireValues
  goNext: () => void
  goPrevious: () => void
  skipCurrent: () => void
  submit: () => void
  reset: () => void
  registerItem: (record: ItemRecord) => () => void
  updateItem: (record: ItemRecord) => void
  answerOf: (name: string) => QuestionnaireAnswer
  statusOf: (name: string) => QuestionnaireItemStatus
  invalidOf: (name: string) => boolean
  requiredOf: (name: string) => boolean
  select: (
    name: string,
    value: string,
    selected: boolean,
    multiple: boolean
  ) => void
  setText: (name: string, text: string) => void
  setDefault: (
    name: string,
    answer: { choice?: string; text?: string },
    on: boolean
  ) => void
}

type QuestionnaireItemContextValue = {
  name: string
  multiple: boolean
  required: boolean
  disabled: boolean
  invalid: boolean
  status: QuestionnaireItemStatus
  answer: QuestionnaireAnswer
  titleId: string
}

type UseQuestionnaireParameters = {
  defaultItem?: string
  item?: string
  items?: readonly QuestionnaireItemDefinition[]
  onItemChange?: (item: string) => void
  onSubmit?: (values: QuestionnaireValues) => void
}

const EMPTY: QuestionnaireAnswer = { choices: [], text: "" }

const SHIFT = I18nManager.isRTL ? -48 : 48

const EASING_DURATION = 280

function slideIn(from: number) {
  return new Keyframe({
    0: { opacity: 0, transform: [{ translateX: from }] },
    100: { opacity: 1, transform: [{ translateX: 0 }] },
  })
    .duration(EASING_DURATION)
    .reduceMotion(ReduceMotion.System)
}

function slideOut(to: number) {
  return new Keyframe({
    0: { opacity: 1, transform: [{ translateX: 0 }] },
    100: { opacity: 0, transform: [{ translateX: to }] },
  })
    .duration(200)
    .reduceMotion(ReduceMotion.System)
}

const TRANSITIONS = {
  forward: { entering: slideIn(SHIFT), exiting: slideOut(-SHIFT) },
  backward: { entering: slideIn(-SHIFT), exiting: slideOut(SHIFT) },
}

const QuestionnaireContext =
  React.createContext<QuestionnaireContextValue | null>(null)

const QuestionnaireItemContext =
  React.createContext<QuestionnaireItemContextValue | null>(null)

function useQuestionnaireContext(component = "useQuestionnaireContext") {
  const context = React.useContext(QuestionnaireContext)
  if (!context) {
    throw new Error(`${component} must be used within a <Questionnaire />`)
  }
  return context
}

function useQuestionnaireItemContext(component: string) {
  const context = React.useContext(QuestionnaireItemContext)
  if (!context) {
    throw new Error(`${component} must be used within a <QuestionnaireItem />`)
  }
  return context
}

function hasAnswer(answer: QuestionnaireAnswer) {
  return answer.choices.length > 0 || answer.text.trim().length > 0
}

function wrapText(children: React.ReactNode, className?: string) {
  if (typeof children === "string" || typeof children === "number") {
    return <Text className={className}>{children}</Text>
  }
  return children
}

function useQuestionnaire({
  defaultItem,
  item,
  items,
  onItemChange,
  onSubmit,
}: UseQuestionnaireParameters) {
  const [records, setRecords] = React.useState<ItemRecord[]>([])
  const [answers, setAnswers] = React.useState<
    Record<string, QuestionnaireAnswer>
  >({})
  const [defaults, setDefaults] = React.useState<
    Record<string, QuestionnaireAnswer>
  >({})
  const [skipped, setSkipped] = React.useState<Record<string, boolean>>({})
  const [attempted, setAttempted] = React.useState<Record<string, boolean>>({})
  const [uncontrolledItem, setUncontrolledItem] = React.useState<string | null>(
    defaultItem ?? null
  )
  const [submitRequest, setSubmitRequest] = React.useState(0)
  const defaultsRef = React.useRef(defaults)
  defaultsRef.current = defaults

  const controlled = item !== undefined
  const requested = controlled ? item : uncontrolledItem
  const definitionByName = React.useMemo(
    () => new Map((items ?? []).map((entry) => [entry.name, entry])),
    [items]
  )
  const recordByName = React.useMemo(
    () => new Map(records.map((record) => [record.name, record])),
    [records]
  )
  const sequence = React.useMemo(
    () =>
      (items ?? records)
        .filter((entry) => !entry.disabled)
        .map((entry) => entry.name),
    [items, records]
  )
  const activeItemName =
    requested !== null && sequence.includes(requested)
      ? requested
      : (sequence[0] ?? null)
  const index = activeItemName ? sequence.indexOf(activeItemName) : -1
  const total = sequence.length
  const current = index < 0 ? 0 : index + 1
  const first = total > 0 && index === 0
  const last = total > 0 && index === total - 1

  const [shownItemName, setShownItemName] = React.useState(activeItemName)
  const [lastDirection, setLastDirection] =
    React.useState<QuestionnaireDirection>("forward")
  const [animated, setAnimated] = React.useState(false)
  const shownIndex = shownItemName ? sequence.indexOf(shownItemName) : -1
  const direction: QuestionnaireDirection =
    shownItemName !== activeItemName && shownIndex >= 0 && index >= 0
      ? index > shownIndex
        ? "forward"
        : "backward"
      : lastDirection

  React.useLayoutEffect(() => {
    if (shownItemName === activeItemName) return
    setLastDirection(direction)
    setShownItemName(activeItemName)
  }, [shownItemName, activeItemName, direction])

  React.useEffect(() => {
    if (shownItemName !== null && !animated) setAnimated(true)
  }, [shownItemName, animated])

  const answerOf = React.useCallback(
    (name: string) => answers[name] ?? defaults[name] ?? EMPTY,
    [answers, defaults]
  )

  const statusOf = React.useCallback(
    (name: string): QuestionnaireItemStatus => {
      if (skipped[name]) return "skipped"
      return hasAnswer(answerOf(name)) ? "answered" : "unanswered"
    },
    [skipped, answerOf]
  )

  const requiredOf = React.useCallback(
    (name: string) => {
      const definition = definitionByName.get(name)
      if (definition) return !!definition.required
      return recordByName.get(name)?.required ?? false
    },
    [definitionByName, recordByName]
  )

  const satisfied = React.useCallback(
    (name: string) => {
      const record = recordByName.get(name)
      if (!record || record.disabled) return true
      const status = statusOf(name)
      if (status === "skipped" && !requiredOf(name)) return true
      return !record.invalid && status === "answered"
    },
    [recordByName, statusOf, requiredOf]
  )

  const invalidOf = React.useCallback(
    (name: string) => {
      const record = recordByName.get(name)
      if (!record || record.disabled) return false
      if (statusOf(name) === "skipped" && !requiredOf(name)) return false
      return record.invalid || (!!attempted[name] && !satisfied(name))
    },
    [recordByName, statusOf, requiredOf, attempted, satisfied]
  )

  const validate = React.useCallback(
    (name: string) => {
      setAttempted((state) => ({ ...state, [name]: true }))
      return satisfied(name)
    },
    [satisfied]
  )

  const navigate = React.useCallback(
    (name: string) => {
      if (name === activeItemName) return
      if (!controlled) setUncontrolledItem(name)
      onItemChange?.(name)
    },
    [activeItemName, controlled, onItemChange]
  )

  const values = React.useMemo(() => {
    const result: QuestionnaireValues = {}
    for (const name of sequence) {
      if (skipped[name]) continue
      const answer = answers[name] ?? defaults[name] ?? EMPTY
      if (!hasAnswer(answer)) continue
      if (recordByName.get(name)?.multiple) {
        result[name] = answer.text.trim()
          ? [...answer.choices, answer.text]
          : answer.choices
      } else {
        result[name] = answer.choices[0] ?? answer.text
      }
    }
    return result
  }, [sequence, skipped, answers, defaults, recordByName])

  const goPrevious = React.useCallback(() => {
    const previous = sequence[index - 1]
    if (previous) navigate(previous)
  }, [sequence, index, navigate])

  const goNext = React.useCallback(() => {
    const next = sequence[index + 1]
    if (!activeItemName || !next) return
    if (!validate(activeItemName)) return
    navigate(next)
  }, [sequence, index, activeItemName, validate, navigate])

  const submit = React.useCallback(() => {
    const invalid = sequence.find((name) => !validate(name))
    if (invalid) {
      navigate(invalid)
      return
    }
    onSubmit?.(values)
  }, [sequence, validate, navigate, onSubmit, values])

  const runSubmit = useEffectEvent(submit)

  React.useEffect(() => {
    if (submitRequest > 0) runSubmit()
  }, [submitRequest, runSubmit])

  const skipCurrent = React.useCallback(() => {
    if (!activeItemName || requiredOf(activeItemName)) return
    setAnswers((state) => ({ ...state, [activeItemName]: EMPTY }))
    setSkipped((state) => ({ ...state, [activeItemName]: true }))
    if (last) {
      setSubmitRequest((count) => count + 1)
      return
    }
    const next = sequence[index + 1]
    if (next) navigate(next)
  }, [activeItemName, requiredOf, last, sequence, index, navigate])

  const reset = React.useCallback(() => {
    setAnswers({})
    setSkipped({})
    setAttempted({})
    const target =
      defaultItem && sequence.includes(defaultItem) ? defaultItem : sequence[0]
    if (target) navigate(target)
  }, [defaultItem, sequence, navigate])

  const registerItem = React.useCallback((record: ItemRecord) => {
    setRecords((state) => [
      ...state.filter((entry) => entry.name !== record.name),
      record,
    ])
    return () => {
      setRecords((state) => state.filter((entry) => entry.name !== record.name))
    }
  }, [])

  const updateItem = React.useCallback((record: ItemRecord) => {
    setRecords((state) =>
      state.map((entry) => (entry.name === record.name ? record : entry))
    )
  }, [])

  const select = React.useCallback(
    (name: string, value: string, selected: boolean, multiple: boolean) => {
      setSkipped((state) => (state[name] ? { ...state, [name]: false } : state))
      setAnswers((state) => {
        const answer = state[name] ?? defaultsRef.current[name] ?? EMPTY
        const choices = !selected
          ? answer.choices.filter((entry) => entry !== value)
          : multiple
            ? answer.choices.includes(value)
              ? answer.choices
              : [...answer.choices, value]
            : [value]
        return { ...state, [name]: { ...answer, choices } }
      })
    },
    []
  )

  const setText = React.useCallback((name: string, text: string) => {
    if (text.trim()) {
      setSkipped((state) => (state[name] ? { ...state, [name]: false } : state))
    }
    setAnswers((state) => {
      const answer = state[name] ?? defaultsRef.current[name] ?? EMPTY
      return { ...state, [name]: { ...answer, text } }
    })
  }, [])

  const setDefault = React.useCallback(
    (name: string, answer: { choice?: string; text?: string }, on: boolean) => {
      setDefaults((state) => {
        const previous = state[name] ?? EMPTY
        const { choice, text } = answer
        const choices =
          choice === undefined
            ? previous.choices
            : on
              ? previous.choices.includes(choice)
                ? previous.choices
                : [...previous.choices, choice]
              : previous.choices.filter((entry) => entry !== choice)
        const nextText = text === undefined ? previous.text : on ? text : ""
        if (choices === previous.choices && nextText === previous.text) {
          return state
        }
        return { ...state, [name]: { choices, text: nextText } }
      })
    },
    []
  )

  const activeItemRequired =
    activeItemName === null ? null : requiredOf(activeItemName)

  const context = React.useMemo<QuestionnaireContextValue>(
    () => ({
      activeItemName,
      activeItemRequired,
      shownItemName,
      direction,
      animated,
      current,
      first,
      last,
      total,
      values,
      goNext,
      goPrevious,
      skipCurrent,
      submit,
      reset,
      registerItem,
      updateItem,
      answerOf,
      statusOf,
      invalidOf,
      requiredOf,
      select,
      setText,
      setDefault,
    }),
    [
      activeItemName,
      activeItemRequired,
      shownItemName,
      direction,
      animated,
      current,
      first,
      last,
      total,
      values,
      goNext,
      goPrevious,
      skipCurrent,
      submit,
      reset,
      registerItem,
      updateItem,
      answerOf,
      statusOf,
      invalidOf,
      requiredOf,
      select,
      setText,
      setDefault,
    ]
  )

  const state: QuestionnaireState = { current, first, last, total }

  return { context, state }
}

function Questionnaire({
  defaultItem,
  item,
  items,
  onItemChange,
  onSubmit,
  className,
  ...props
}: React.ComponentProps<typeof View> &
  React.RefAttributes<View> &
  UseQuestionnaireParameters) {
  const questionnaire = useQuestionnaire({
    defaultItem,
    item,
    items,
    onItemChange,
    onSubmit,
  })
  return (
    <QuestionnaireContext.Provider value={questionnaire.context}>
      <View
        className={cn("w-full min-w-0 flex-col gap-6", className)}
        {...props}
      />
    </QuestionnaireContext.Provider>
  )
}

function QuestionnaireProgress({
  className,
  children,
  ...props
}: Omit<React.ComponentProps<typeof View>, "children"> &
  React.RefAttributes<View> & {
    children?:
      | React.ReactNode
      | ((state: QuestionnaireState) => React.ReactNode)
  }) {
  const { current, first, last, total } = useQuestionnaireContext(
    "QuestionnaireProgress"
  )
  const text = total ? `Question ${current} of ${total}` : undefined
  const content =
    typeof children === "function"
      ? children({ current, first, last, total })
      : children
  return (
    <View
      role="progressbar"
      accessibilityLabel="Questionnaire progress"
      accessibilityLiveRegion="polite"
      accessibilityValue={
        total ? { min: 1, max: total, now: current, text } : undefined
      }
      className={cn("min-h-4 self-start", className)}
      {...props}
    >
      {content === undefined ? (
        <Text className="text-xs text-label-secondary tabular-nums">
          {text}
        </Text>
      ) : (
        wrapText(content, "text-xs text-label-secondary tabular-nums")
      )}
    </View>
  )
}

function QuestionnaireItem({
  name,
  required = false,
  disabled = false,
  invalid: invalidProp = false,
  multiple = false,
  onStatusChange,
  className,
  children,
  ...props
}: React.ComponentProps<typeof View> &
  React.RefAttributes<View> & {
    name: string
    required?: boolean
    disabled?: boolean
    invalid?: boolean
    multiple?: boolean
    onStatusChange?: (status: QuestionnaireItemStatus) => void
  }) {
  const root = useQuestionnaireContext("QuestionnaireItem")
  const titleId = React.useId()
  const record = React.useMemo<ItemRecord>(
    () => ({ name, required, disabled, invalid: invalidProp, multiple }),
    [name, required, disabled, invalidProp, multiple]
  )
  const recordRef = React.useRef(record)
  recordRef.current = record
  const { registerItem, updateItem } = root

  React.useLayoutEffect(
    () => registerItem({ ...recordRef.current, name }),
    [name, registerItem]
  )

  React.useLayoutEffect(() => {
    updateItem(record)
  }, [record, updateItem])

  const status = root.statusOf(name)
  const statusRef = React.useRef(status)
  React.useEffect(() => {
    if (statusRef.current === status) return
    statusRef.current = status
    onStatusChange?.(status)
  }, [status, onStatusChange])

  const answer = root.answerOf(name)
  const invalid = root.invalidOf(name)
  const context = React.useMemo<QuestionnaireItemContextValue>(
    () => ({
      name,
      multiple,
      required: root.requiredOf(name),
      disabled,
      invalid,
      status,
      answer,
      titleId,
    }),
    [
      name,
      multiple,
      root.requiredOf,
      disabled,
      invalid,
      status,
      answer,
      titleId,
    ]
  )
  const shown = !disabled && root.shownItemName === name
  const transition = TRANSITIONS[root.direction]

  return (
    <QuestionnaireItemContext.Provider value={context}>
      {shown ? (
        <Animated.View
          key="shown"
          role={multiple ? "group" : "radiogroup"}
          accessibilityLabelledBy={titleId}
          entering={root.animated ? transition.entering : undefined}
          exiting={transition.exiting}
          className={cn("min-w-0 flex-col gap-5", className)}
          {...props}
        >
          {children}
        </Animated.View>
      ) : (
        <View key="hidden" style={{ display: "none" }}>
          {children}
        </View>
      )}
    </QuestionnaireItemContext.Provider>
  )
}

function QuestionnaireTitle({
  className,
  ...props
}: Omit<React.ComponentProps<typeof Text>, "nativeID"> &
  React.RefAttributes<typeof Text>) {
  const { titleId } = useQuestionnaireItemContext("QuestionnaireTitle")
  return (
    <Text
      role="heading"
      nativeID={titleId}
      className={cn("text-base font-semibold", className)}
      {...props}
    />
  )
}

function QuestionnaireDescription({
  className,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  useQuestionnaireItemContext("QuestionnaireDescription")
  return (
    <Text
      className={cn("-mt-3.5 text-sm text-label-secondary", className)}
      {...props}
    />
  )
}

function QuestionnaireChoices({
  className,
  ...props
}: React.ComponentProps<typeof View> & React.RefAttributes<View>) {
  useQuestionnaireItemContext("QuestionnaireChoices")
  return <View className={cn("min-w-0 gap-3", className)} {...props} />
}

function QuestionnaireChoice({
  value,
  checked,
  defaultChecked = false,
  disabled: disabledProp = false,
  onCheckedChange,
  className,
  children,
  onPress,
  ...props
}: Omit<React.ComponentProps<typeof Pressable>, "children"> &
  React.RefAttributes<View> & {
    value: string
    checked?: boolean
    defaultChecked?: boolean
    disabled?: boolean
    onCheckedChange?: (checked: boolean) => void
    children?: React.ReactNode
  }) {
  const root = useQuestionnaireContext("QuestionnaireChoice")
  const item = useQuestionnaireItemContext("QuestionnaireChoice")
  const haptics = useHaptics()
  const { name, multiple } = item
  const disabled = item.disabled || disabledProp
  const isChecked =
    item.status !== "skipped" && item.answer.choices.includes(value)
  const { select, setDefault } = root

  React.useLayoutEffect(() => {
    if (!defaultChecked) return
    setDefault(name, { choice: value }, true)
    return () => setDefault(name, { choice: value }, false)
  }, [defaultChecked, name, value, setDefault])

  React.useLayoutEffect(() => {
    if (checked === undefined || checked === isChecked) return
    select(name, value, checked, multiple)
  }, [checked, isChecked, name, value, multiple, select])

  const handlePress = (event: GestureResponderEvent) => {
    onPress?.(event)
    if (disabled) return
    const next = multiple ? !isChecked : true
    if (next === isChecked) return
    onCheckedChange?.(next)
    if (checked !== undefined) return
    select(name, value, next, multiple)
    haptics.selection()
  }

  return (
    <Pressable
      role={multiple ? "checkbox" : "radio"}
      accessibilityState={{ checked: isChecked, disabled }}
      disabled={disabled}
      onPress={handlePress}
      className={cn(
        "relative min-h-11 flex-row items-start gap-2.5 rounded-xl border border-separator px-4 py-3 active:bg-item-pressed",
        item.invalid && "border-danger bg-danger/5 dark:bg-danger/10",
        isChecked && "border-2 border-accent px-3.75 py-2.75",
        className
      )}
      {...props}
    >
      <View
        className={cn(
          "mt-1 size-4 shrink-0 items-center justify-center bg-label-quaternary",
          multiple ? "rounded-xs" : "rounded-full",
          isChecked && "bg-accent"
        )}
      >
        {isChecked ? (
          multiple ? (
            <Icon
              as={CheckIcon}
              weight="bold"
              className="size-3.5 text-on-accent"
            />
          ) : (
            <View className="size-2 rounded-full bg-on-accent dark:size-2.5" />
          )
        ) : null}
      </View>
      <TextClassContext.Provider
        value={cn(
          "text-base",
          disabled ? "text-label-quaternary" : "text-label"
        )}
      >
        <View className="min-w-0 flex-1 gap-1">
          {React.Children.map(children, (child) => wrapText(child))}
        </View>
      </TextClassContext.Provider>
    </Pressable>
  )
}

function QuestionnaireChoiceDescription({
  className,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  return <Text className={cn("text-label-secondary", className)} {...props} />
}

function inputTypeProps(
  type: QuestionnaireInputType
): Partial<React.ComponentProps<typeof Input>> {
  switch (type) {
    case "email":
      return {
        keyboardType: "email-address",
        autoCapitalize: "none",
        autoComplete: "email",
        textContentType: "emailAddress",
      }
    case "number":
      return { keyboardType: "numeric" }
    case "tel":
      return {
        keyboardType: "phone-pad",
        autoComplete: "tel",
        textContentType: "telephoneNumber",
      }
    case "url":
      return {
        keyboardType: "url",
        autoCapitalize: "none",
        textContentType: "URL",
      }
    case "password":
      return {
        secureTextEntry: true,
        autoCapitalize: "none",
        textContentType: "password",
      }
    case "search":
      return { returnKeyType: "search" }
    default:
      return {}
  }
}

function QuestionnaireInput({
  type = "text",
  value,
  defaultValue,
  onValueChange,
  disabled = false,
  className,
  accessibilityLabel,
  ...props
}: Omit<React.ComponentProps<typeof Input>, "name" | "required"> & {
  type?: QuestionnaireInputType
}) {
  const root = useQuestionnaireContext("QuestionnaireInput")
  const item = useQuestionnaireItemContext("QuestionnaireInput")
  const { name } = item
  const { setText, setDefault } = root

  React.useLayoutEffect(() => {
    if (!defaultValue) return
    setDefault(name, { text: defaultValue }, true)
    return () => setDefault(name, { text: defaultValue }, false)
  }, [defaultValue, name, setDefault])

  React.useLayoutEffect(() => {
    if (value !== undefined) setText(name, value)
  }, [value, name, setText])

  return (
    <Input
      {...inputTypeProps(type)}
      value={value ?? item.answer.text}
      onValueChange={(next, details) => {
        onValueChange?.(next, details)
        if (value === undefined && !details.isCanceled) setText(name, next)
      }}
      disabled={item.disabled || disabled}
      accessibilityLabel={accessibilityLabel}
      accessibilityLabelledBy={
        accessibilityLabel === undefined ? item.titleId : undefined
      }
      className={(state) =>
        cn(
          item.invalid && "border-danger bg-danger/5 dark:bg-danger/10",
          resolveClassName(className, state)
        )
      }
      {...props}
    />
  )
}

function QuestionnaireError({
  className,
  children,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  const { invalid, required } =
    useQuestionnaireItemContext("QuestionnaireError")
  if (!invalid) return null
  return (
    <Text
      role="alert"
      accessibilityLiveRegion="polite"
      className={cn("text-sm text-danger", className)}
      {...props}
    >
      {children ??
        (required
          ? "Choose an answer to continue."
          : "Choose an answer or skip this question.")}
    </Text>
  )
}

function QuestionnaireActions({
  className,
  ...props
}: React.ComponentProps<typeof View> & React.RefAttributes<View>) {
  return (
    <View
      className={cn(
        "min-h-11 w-full flex-row items-center justify-end gap-2",
        className
      )}
      {...props}
    />
  )
}

type QuestionnaireNavigationProps = Omit<ButtonProps, "children"> & {
  children?: React.ReactNode
}

function NavigationButton({
  visible,
  action,
  label,
  children,
  className,
  onPress,
  ...props
}: QuestionnaireNavigationProps & {
  visible: boolean
  action: () => void
  label: string
}) {
  if (!visible) return null
  return (
    <Button
      className={cn("min-h-11", className)}
      onPress={(event) => {
        onPress?.(event)
        action()
      }}
      {...props}
    >
      {wrapText(children ?? label)}
    </Button>
  )
}

function QuestionnairePrevious({
  variant = "outline",
  className,
  ...props
}: QuestionnaireNavigationProps) {
  const { first, total, goPrevious } = useQuestionnaireContext(
    "QuestionnairePrevious"
  )
  return (
    <NavigationButton
      variant={variant}
      className={cn("me-auto", className)}
      visible={total > 1 && !first}
      action={goPrevious}
      label="Previous"
      {...props}
    />
  )
}

function QuestionnaireSkip({
  variant = "outline",
  ...props
}: QuestionnaireNavigationProps) {
  const { activeItemRequired, skipCurrent } =
    useQuestionnaireContext("QuestionnaireSkip")
  return (
    <NavigationButton
      variant={variant}
      visible={activeItemRequired === false}
      action={skipCurrent}
      label="Skip"
      {...props}
    />
  )
}

function QuestionnaireNext({
  variant = "default",
  ...props
}: QuestionnaireNavigationProps) {
  const { last, total, goNext } = useQuestionnaireContext("QuestionnaireNext")
  return (
    <NavigationButton
      variant={variant}
      visible={total > 1 && !last}
      action={goNext}
      label="Next"
      {...props}
    />
  )
}

function QuestionnaireSubmit({
  variant = "default",
  ...props
}: QuestionnaireNavigationProps) {
  const { last, total, submit } = useQuestionnaireContext("QuestionnaireSubmit")
  return (
    <NavigationButton
      variant={variant}
      visible={total > 0 && last}
      action={submit}
      label="Submit"
      {...props}
    />
  )
}

export type {
  QuestionnaireItemDefinition,
  QuestionnaireItemStatus,
  QuestionnaireState,
  QuestionnaireValues,
}
export {
  Questionnaire,
  QuestionnaireActions,
  QuestionnaireChoice,
  QuestionnaireChoiceDescription,
  QuestionnaireChoices,
  QuestionnaireDescription,
  QuestionnaireError,
  QuestionnaireInput,
  QuestionnaireItem,
  QuestionnaireNext,
  QuestionnairePrevious,
  QuestionnaireProgress,
  QuestionnaireSkip,
  QuestionnaireSubmit,
  QuestionnaireTitle,
  useQuestionnaire,
  useQuestionnaireContext,
}
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`, `components/primitives/hooks.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/ui/questionnaire.tsx`:

```tsx title="nativewind/components/ui/questionnaire.tsx"
import { cn } from "cn"
import { CheckIcon } from "phosphor-react-native"
import * as React from "react"
import {
  type GestureResponderEvent,
  I18nManager,
  Pressable,
  View,
} from "react-native"
import Animated, { Keyframe, ReduceMotion } from "react-native-reanimated"
import { useHaptics } from "@/components/primitives/haptics"
import { useEffectEvent } from "@/components/primitives/hooks"
import { resolveClassName } from "@/components/primitives/use-render"
import { Button, type ButtonProps } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { Text, TextClassContext } from "@/components/ui/text"

type QuestionnaireItemStatus = "unanswered" | "answered" | "skipped"

type QuestionnaireItemDefinition = {
  name: string
  required?: boolean
  disabled?: boolean
}

type QuestionnaireValues = Record<string, string | string[]>

type QuestionnaireState = {
  current: number
  first: boolean
  last: boolean
  total: number
}

type QuestionnaireDirection = "forward" | "backward"

type QuestionnaireAnswer = { choices: string[]; text: string }

type ItemRecord = {
  name: string
  required: boolean
  disabled: boolean
  invalid: boolean
  multiple: boolean
}

type QuestionnaireInputType =
  | "text"
  | "email"
  | "number"
  | "tel"
  | "url"
  | "password"
  | "search"

type QuestionnaireContextValue = QuestionnaireState & {
  activeItemName: string | null
  activeItemRequired: boolean | null
  shownItemName: string | null
  direction: QuestionnaireDirection
  animated: boolean
  values: QuestionnaireValues
  goNext: () => void
  goPrevious: () => void
  skipCurrent: () => void
  submit: () => void
  reset: () => void
  registerItem: (record: ItemRecord) => () => void
  updateItem: (record: ItemRecord) => void
  answerOf: (name: string) => QuestionnaireAnswer
  statusOf: (name: string) => QuestionnaireItemStatus
  invalidOf: (name: string) => boolean
  requiredOf: (name: string) => boolean
  select: (
    name: string,
    value: string,
    selected: boolean,
    multiple: boolean
  ) => void
  setText: (name: string, text: string) => void
  setDefault: (
    name: string,
    answer: { choice?: string; text?: string },
    on: boolean
  ) => void
}

type QuestionnaireItemContextValue = {
  name: string
  multiple: boolean
  required: boolean
  disabled: boolean
  invalid: boolean
  status: QuestionnaireItemStatus
  answer: QuestionnaireAnswer
  titleId: string
}

type UseQuestionnaireParameters = {
  defaultItem?: string
  item?: string
  items?: readonly QuestionnaireItemDefinition[]
  onItemChange?: (item: string) => void
  onSubmit?: (values: QuestionnaireValues) => void
}

const EMPTY: QuestionnaireAnswer = { choices: [], text: "" }

const SHIFT = I18nManager.isRTL ? -48 : 48

const EASING_DURATION = 280

function slideIn(from: number) {
  return new Keyframe({
    0: { opacity: 0, transform: [{ translateX: from }] },
    100: { opacity: 1, transform: [{ translateX: 0 }] },
  })
    .duration(EASING_DURATION)
    .reduceMotion(ReduceMotion.System)
}

function slideOut(to: number) {
  return new Keyframe({
    0: { opacity: 1, transform: [{ translateX: 0 }] },
    100: { opacity: 0, transform: [{ translateX: to }] },
  })
    .duration(200)
    .reduceMotion(ReduceMotion.System)
}

const TRANSITIONS = {
  forward: { entering: slideIn(SHIFT), exiting: slideOut(-SHIFT) },
  backward: { entering: slideIn(-SHIFT), exiting: slideOut(SHIFT) },
}

const QuestionnaireContext =
  React.createContext<QuestionnaireContextValue | null>(null)

const QuestionnaireItemContext =
  React.createContext<QuestionnaireItemContextValue | null>(null)

function useQuestionnaireContext(component = "useQuestionnaireContext") {
  const context = React.useContext(QuestionnaireContext)
  if (!context) {
    throw new Error(`${component} must be used within a <Questionnaire />`)
  }
  return context
}

function useQuestionnaireItemContext(component: string) {
  const context = React.useContext(QuestionnaireItemContext)
  if (!context) {
    throw new Error(`${component} must be used within a <QuestionnaireItem />`)
  }
  return context
}

function hasAnswer(answer: QuestionnaireAnswer) {
  return answer.choices.length > 0 || answer.text.trim().length > 0
}

function wrapText(children: React.ReactNode, className?: string) {
  if (typeof children === "string" || typeof children === "number") {
    return <Text className={className}>{children}</Text>
  }
  return children
}

function useQuestionnaire({
  defaultItem,
  item,
  items,
  onItemChange,
  onSubmit,
}: UseQuestionnaireParameters) {
  const [records, setRecords] = React.useState<ItemRecord[]>([])
  const [answers, setAnswers] = React.useState<
    Record<string, QuestionnaireAnswer>
  >({})
  const [defaults, setDefaults] = React.useState<
    Record<string, QuestionnaireAnswer>
  >({})
  const [skipped, setSkipped] = React.useState<Record<string, boolean>>({})
  const [attempted, setAttempted] = React.useState<Record<string, boolean>>({})
  const [uncontrolledItem, setUncontrolledItem] = React.useState<string | null>(
    defaultItem ?? null
  )
  const [submitRequest, setSubmitRequest] = React.useState(0)
  const defaultsRef = React.useRef(defaults)
  defaultsRef.current = defaults

  const controlled = item !== undefined
  const requested = controlled ? item : uncontrolledItem
  const definitionByName = React.useMemo(
    () => new Map((items ?? []).map((entry) => [entry.name, entry])),
    [items]
  )
  const recordByName = React.useMemo(
    () => new Map(records.map((record) => [record.name, record])),
    [records]
  )
  const sequence = React.useMemo(
    () =>
      (items ?? records)
        .filter((entry) => !entry.disabled)
        .map((entry) => entry.name),
    [items, records]
  )
  const activeItemName =
    requested !== null && sequence.includes(requested)
      ? requested
      : (sequence[0] ?? null)
  const index = activeItemName ? sequence.indexOf(activeItemName) : -1
  const total = sequence.length
  const current = index < 0 ? 0 : index + 1
  const first = total > 0 && index === 0
  const last = total > 0 && index === total - 1

  const [shownItemName, setShownItemName] = React.useState(activeItemName)
  const [lastDirection, setLastDirection] =
    React.useState<QuestionnaireDirection>("forward")
  const [animated, setAnimated] = React.useState(false)
  const shownIndex = shownItemName ? sequence.indexOf(shownItemName) : -1
  const direction: QuestionnaireDirection =
    shownItemName !== activeItemName && shownIndex >= 0 && index >= 0
      ? index > shownIndex
        ? "forward"
        : "backward"
      : lastDirection

  React.useLayoutEffect(() => {
    if (shownItemName === activeItemName) return
    setLastDirection(direction)
    setShownItemName(activeItemName)
  }, [shownItemName, activeItemName, direction])

  React.useEffect(() => {
    if (shownItemName !== null && !animated) setAnimated(true)
  }, [shownItemName, animated])

  const answerOf = React.useCallback(
    (name: string) => answers[name] ?? defaults[name] ?? EMPTY,
    [answers, defaults]
  )

  const statusOf = React.useCallback(
    (name: string): QuestionnaireItemStatus => {
      if (skipped[name]) return "skipped"
      return hasAnswer(answerOf(name)) ? "answered" : "unanswered"
    },
    [skipped, answerOf]
  )

  const requiredOf = React.useCallback(
    (name: string) => {
      const definition = definitionByName.get(name)
      if (definition) return !!definition.required
      return recordByName.get(name)?.required ?? false
    },
    [definitionByName, recordByName]
  )

  const satisfied = React.useCallback(
    (name: string) => {
      const record = recordByName.get(name)
      if (!record || record.disabled) return true
      const status = statusOf(name)
      if (status === "skipped" && !requiredOf(name)) return true
      return !record.invalid && status === "answered"
    },
    [recordByName, statusOf, requiredOf]
  )

  const invalidOf = React.useCallback(
    (name: string) => {
      const record = recordByName.get(name)
      if (!record || record.disabled) return false
      if (statusOf(name) === "skipped" && !requiredOf(name)) return false
      return record.invalid || (!!attempted[name] && !satisfied(name))
    },
    [recordByName, statusOf, requiredOf, attempted, satisfied]
  )

  const validate = React.useCallback(
    (name: string) => {
      setAttempted((state) => ({ ...state, [name]: true }))
      return satisfied(name)
    },
    [satisfied]
  )

  const navigate = React.useCallback(
    (name: string) => {
      if (name === activeItemName) return
      if (!controlled) setUncontrolledItem(name)
      onItemChange?.(name)
    },
    [activeItemName, controlled, onItemChange]
  )

  const values = React.useMemo(() => {
    const result: QuestionnaireValues = {}
    for (const name of sequence) {
      if (skipped[name]) continue
      const answer = answers[name] ?? defaults[name] ?? EMPTY
      if (!hasAnswer(answer)) continue
      if (recordByName.get(name)?.multiple) {
        result[name] = answer.text.trim()
          ? [...answer.choices, answer.text]
          : answer.choices
      } else {
        result[name] = answer.choices[0] ?? answer.text
      }
    }
    return result
  }, [sequence, skipped, answers, defaults, recordByName])

  const goPrevious = React.useCallback(() => {
    const previous = sequence[index - 1]
    if (previous) navigate(previous)
  }, [sequence, index, navigate])

  const goNext = React.useCallback(() => {
    const next = sequence[index + 1]
    if (!activeItemName || !next) return
    if (!validate(activeItemName)) return
    navigate(next)
  }, [sequence, index, activeItemName, validate, navigate])

  const submit = React.useCallback(() => {
    const invalid = sequence.find((name) => !validate(name))
    if (invalid) {
      navigate(invalid)
      return
    }
    onSubmit?.(values)
  }, [sequence, validate, navigate, onSubmit, values])

  const runSubmit = useEffectEvent(submit)

  React.useEffect(() => {
    if (submitRequest > 0) runSubmit()
  }, [submitRequest, runSubmit])

  const skipCurrent = React.useCallback(() => {
    if (!activeItemName || requiredOf(activeItemName)) return
    setAnswers((state) => ({ ...state, [activeItemName]: EMPTY }))
    setSkipped((state) => ({ ...state, [activeItemName]: true }))
    if (last) {
      setSubmitRequest((count) => count + 1)
      return
    }
    const next = sequence[index + 1]
    if (next) navigate(next)
  }, [activeItemName, requiredOf, last, sequence, index, navigate])

  const reset = React.useCallback(() => {
    setAnswers({})
    setSkipped({})
    setAttempted({})
    const target =
      defaultItem && sequence.includes(defaultItem) ? defaultItem : sequence[0]
    if (target) navigate(target)
  }, [defaultItem, sequence, navigate])

  const registerItem = React.useCallback((record: ItemRecord) => {
    setRecords((state) => [
      ...state.filter((entry) => entry.name !== record.name),
      record,
    ])
    return () => {
      setRecords((state) => state.filter((entry) => entry.name !== record.name))
    }
  }, [])

  const updateItem = React.useCallback((record: ItemRecord) => {
    setRecords((state) =>
      state.map((entry) => (entry.name === record.name ? record : entry))
    )
  }, [])

  const select = React.useCallback(
    (name: string, value: string, selected: boolean, multiple: boolean) => {
      setSkipped((state) => (state[name] ? { ...state, [name]: false } : state))
      setAnswers((state) => {
        const answer = state[name] ?? defaultsRef.current[name] ?? EMPTY
        const choices = !selected
          ? answer.choices.filter((entry) => entry !== value)
          : multiple
            ? answer.choices.includes(value)
              ? answer.choices
              : [...answer.choices, value]
            : [value]
        return { ...state, [name]: { ...answer, choices } }
      })
    },
    []
  )

  const setText = React.useCallback((name: string, text: string) => {
    if (text.trim()) {
      setSkipped((state) => (state[name] ? { ...state, [name]: false } : state))
    }
    setAnswers((state) => {
      const answer = state[name] ?? defaultsRef.current[name] ?? EMPTY
      return { ...state, [name]: { ...answer, text } }
    })
  }, [])

  const setDefault = React.useCallback(
    (name: string, answer: { choice?: string; text?: string }, on: boolean) => {
      setDefaults((state) => {
        const previous = state[name] ?? EMPTY
        const { choice, text } = answer
        const choices =
          choice === undefined
            ? previous.choices
            : on
              ? previous.choices.includes(choice)
                ? previous.choices
                : [...previous.choices, choice]
              : previous.choices.filter((entry) => entry !== choice)
        const nextText = text === undefined ? previous.text : on ? text : ""
        if (choices === previous.choices && nextText === previous.text) {
          return state
        }
        return { ...state, [name]: { choices, text: nextText } }
      })
    },
    []
  )

  const activeItemRequired =
    activeItemName === null ? null : requiredOf(activeItemName)

  const context = React.useMemo<QuestionnaireContextValue>(
    () => ({
      activeItemName,
      activeItemRequired,
      shownItemName,
      direction,
      animated,
      current,
      first,
      last,
      total,
      values,
      goNext,
      goPrevious,
      skipCurrent,
      submit,
      reset,
      registerItem,
      updateItem,
      answerOf,
      statusOf,
      invalidOf,
      requiredOf,
      select,
      setText,
      setDefault,
    }),
    [
      activeItemName,
      activeItemRequired,
      shownItemName,
      direction,
      animated,
      current,
      first,
      last,
      total,
      values,
      goNext,
      goPrevious,
      skipCurrent,
      submit,
      reset,
      registerItem,
      updateItem,
      answerOf,
      statusOf,
      invalidOf,
      requiredOf,
      select,
      setText,
      setDefault,
    ]
  )

  const state: QuestionnaireState = { current, first, last, total }

  return { context, state }
}

function Questionnaire({
  defaultItem,
  item,
  items,
  onItemChange,
  onSubmit,
  className,
  ...props
}: React.ComponentProps<typeof View> &
  React.RefAttributes<View> &
  UseQuestionnaireParameters) {
  const questionnaire = useQuestionnaire({
    defaultItem,
    item,
    items,
    onItemChange,
    onSubmit,
  })
  return (
    <QuestionnaireContext.Provider value={questionnaire.context}>
      <View
        className={cn("w-full min-w-0 flex-col gap-6", className)}
        {...props}
      />
    </QuestionnaireContext.Provider>
  )
}

function QuestionnaireProgress({
  className,
  children,
  ...props
}: Omit<React.ComponentProps<typeof View>, "children"> &
  React.RefAttributes<View> & {
    children?:
      | React.ReactNode
      | ((state: QuestionnaireState) => React.ReactNode)
  }) {
  const { current, first, last, total } = useQuestionnaireContext(
    "QuestionnaireProgress"
  )
  const text = total ? `Question ${current} of ${total}` : undefined
  const content =
    typeof children === "function"
      ? children({ current, first, last, total })
      : children
  return (
    <View
      role="progressbar"
      accessibilityLabel="Questionnaire progress"
      accessibilityLiveRegion="polite"
      accessibilityValue={
        total ? { min: 1, max: total, now: current, text } : undefined
      }
      className={cn("min-h-4 self-start", className)}
      {...props}
    >
      {content === undefined ? (
        <Text className="text-xs text-label-secondary tabular-nums">
          {text}
        </Text>
      ) : (
        wrapText(content, "text-xs text-label-secondary tabular-nums")
      )}
    </View>
  )
}

function QuestionnaireItem({
  name,
  required = false,
  disabled = false,
  invalid: invalidProp = false,
  multiple = false,
  onStatusChange,
  className,
  children,
  ...props
}: React.ComponentProps<typeof View> &
  React.RefAttributes<View> & {
    name: string
    required?: boolean
    disabled?: boolean
    invalid?: boolean
    multiple?: boolean
    onStatusChange?: (status: QuestionnaireItemStatus) => void
  }) {
  const root = useQuestionnaireContext("QuestionnaireItem")
  const titleId = React.useId()
  const record = React.useMemo<ItemRecord>(
    () => ({ name, required, disabled, invalid: invalidProp, multiple }),
    [name, required, disabled, invalidProp, multiple]
  )
  const recordRef = React.useRef(record)
  recordRef.current = record
  const { registerItem, updateItem } = root

  React.useLayoutEffect(
    () => registerItem({ ...recordRef.current, name }),
    [name, registerItem]
  )

  React.useLayoutEffect(() => {
    updateItem(record)
  }, [record, updateItem])

  const status = root.statusOf(name)
  const statusRef = React.useRef(status)
  React.useEffect(() => {
    if (statusRef.current === status) return
    statusRef.current = status
    onStatusChange?.(status)
  }, [status, onStatusChange])

  const answer = root.answerOf(name)
  const invalid = root.invalidOf(name)
  const context = React.useMemo<QuestionnaireItemContextValue>(
    () => ({
      name,
      multiple,
      required: root.requiredOf(name),
      disabled,
      invalid,
      status,
      answer,
      titleId,
    }),
    [
      name,
      multiple,
      root.requiredOf,
      disabled,
      invalid,
      status,
      answer,
      titleId,
    ]
  )
  const shown = !disabled && root.shownItemName === name
  const transition = TRANSITIONS[root.direction]

  return (
    <QuestionnaireItemContext.Provider value={context}>
      {shown ? (
        <Animated.View
          key="shown"
          role={multiple ? "group" : "radiogroup"}
          accessibilityLabelledBy={titleId}
          entering={root.animated ? transition.entering : undefined}
          exiting={transition.exiting}
          className={cn("min-w-0 flex-col gap-5", className)}
          {...props}
        >
          {children}
        </Animated.View>
      ) : (
        <View key="hidden" style={{ display: "none" }}>
          {children}
        </View>
      )}
    </QuestionnaireItemContext.Provider>
  )
}

function QuestionnaireTitle({
  className,
  ...props
}: Omit<React.ComponentProps<typeof Text>, "nativeID"> &
  React.RefAttributes<typeof Text>) {
  const { titleId } = useQuestionnaireItemContext("QuestionnaireTitle")
  return (
    <Text
      role="heading"
      nativeID={titleId}
      className={cn("text-base font-semibold", className)}
      {...props}
    />
  )
}

function QuestionnaireDescription({
  className,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  useQuestionnaireItemContext("QuestionnaireDescription")
  return (
    <Text
      className={cn("-mt-3.5 text-sm text-label-secondary", className)}
      {...props}
    />
  )
}

function QuestionnaireChoices({
  className,
  ...props
}: React.ComponentProps<typeof View> & React.RefAttributes<View>) {
  useQuestionnaireItemContext("QuestionnaireChoices")
  return <View className={cn("min-w-0 gap-3", className)} {...props} />
}

function QuestionnaireChoice({
  value,
  checked,
  defaultChecked = false,
  disabled: disabledProp = false,
  onCheckedChange,
  className,
  children,
  onPress,
  ...props
}: Omit<React.ComponentProps<typeof Pressable>, "children"> &
  React.RefAttributes<View> & {
    value: string
    checked?: boolean
    defaultChecked?: boolean
    disabled?: boolean
    onCheckedChange?: (checked: boolean) => void
    children?: React.ReactNode
  }) {
  const root = useQuestionnaireContext("QuestionnaireChoice")
  const item = useQuestionnaireItemContext("QuestionnaireChoice")
  const haptics = useHaptics()
  const { name, multiple } = item
  const disabled = item.disabled || disabledProp
  const isChecked =
    item.status !== "skipped" && item.answer.choices.includes(value)
  const { select, setDefault } = root

  React.useLayoutEffect(() => {
    if (!defaultChecked) return
    setDefault(name, { choice: value }, true)
    return () => setDefault(name, { choice: value }, false)
  }, [defaultChecked, name, value, setDefault])

  React.useLayoutEffect(() => {
    if (checked === undefined || checked === isChecked) return
    select(name, value, checked, multiple)
  }, [checked, isChecked, name, value, multiple, select])

  const handlePress = (event: GestureResponderEvent) => {
    onPress?.(event)
    if (disabled) return
    const next = multiple ? !isChecked : true
    if (next === isChecked) return
    onCheckedChange?.(next)
    if (checked !== undefined) return
    select(name, value, next, multiple)
    haptics.selection()
  }

  return (
    <Pressable
      role={multiple ? "checkbox" : "radio"}
      accessibilityState={{ checked: isChecked, disabled }}
      disabled={disabled}
      onPress={handlePress}
      className={cn(
        "relative min-h-11 flex-row items-start gap-2.5 rounded-xl border border-separator px-4 py-3 active:bg-item-pressed",
        item.invalid && "border-danger bg-danger-5 dark:bg-danger-10",
        isChecked && "border-2 border-accent px-[0.9375rem] py-[0.6875rem]",
        className
      )}
      {...props}
    >
      <View
        className={cn(
          "mt-1 size-4 shrink-0 items-center justify-center bg-label-quaternary",
          multiple ? "rounded-xs" : "rounded-full",
          isChecked && "bg-accent"
        )}
      >
        {isChecked ? (
          multiple ? (
            <Icon
              as={CheckIcon}
              weight="bold"
              className="size-3.5 text-on-accent"
            />
          ) : (
            <View className="size-2 rounded-full bg-on-accent dark:size-2.5" />
          )
        ) : null}
      </View>
      <TextClassContext.Provider
        value={cn(
          "text-base",
          disabled ? "text-label-quaternary" : "text-label"
        )}
      >
        <View className="min-w-0 flex-1 gap-1">
          {React.Children.map(children, (child) => wrapText(child))}
        </View>
      </TextClassContext.Provider>
    </Pressable>
  )
}

function QuestionnaireChoiceDescription({
  className,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  return <Text className={cn("text-label-secondary", className)} {...props} />
}

function inputTypeProps(
  type: QuestionnaireInputType
): Partial<React.ComponentProps<typeof Input>> {
  switch (type) {
    case "email":
      return {
        keyboardType: "email-address",
        autoCapitalize: "none",
        autoComplete: "email",
        textContentType: "emailAddress",
      }
    case "number":
      return { keyboardType: "numeric" }
    case "tel":
      return {
        keyboardType: "phone-pad",
        autoComplete: "tel",
        textContentType: "telephoneNumber",
      }
    case "url":
      return {
        keyboardType: "url",
        autoCapitalize: "none",
        textContentType: "URL",
      }
    case "password":
      return {
        secureTextEntry: true,
        autoCapitalize: "none",
        textContentType: "password",
      }
    case "search":
      return { returnKeyType: "search" }
    default:
      return {}
  }
}

function QuestionnaireInput({
  type = "text",
  value,
  defaultValue,
  onValueChange,
  disabled = false,
  className,
  accessibilityLabel,
  ...props
}: Omit<React.ComponentProps<typeof Input>, "name" | "required"> & {
  type?: QuestionnaireInputType
}) {
  const root = useQuestionnaireContext("QuestionnaireInput")
  const item = useQuestionnaireItemContext("QuestionnaireInput")
  const { name } = item
  const { setText, setDefault } = root

  React.useLayoutEffect(() => {
    if (!defaultValue) return
    setDefault(name, { text: defaultValue }, true)
    return () => setDefault(name, { text: defaultValue }, false)
  }, [defaultValue, name, setDefault])

  React.useLayoutEffect(() => {
    if (value !== undefined) setText(name, value)
  }, [value, name, setText])

  return (
    <Input
      {...inputTypeProps(type)}
      value={value ?? item.answer.text}
      onValueChange={(next, details) => {
        onValueChange?.(next, details)
        if (value === undefined && !details.isCanceled) setText(name, next)
      }}
      disabled={item.disabled || disabled}
      accessibilityLabel={accessibilityLabel}
      accessibilityLabelledBy={
        accessibilityLabel === undefined ? item.titleId : undefined
      }
      className={(state) =>
        cn(
          item.invalid && "border-danger bg-danger-5 dark:bg-danger-10",
          resolveClassName(className, state)
        )
      }
      {...props}
    />
  )
}

function QuestionnaireError({
  className,
  children,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  const { invalid, required } =
    useQuestionnaireItemContext("QuestionnaireError")
  if (!invalid) return null
  return (
    <Text
      role="alert"
      accessibilityLiveRegion="polite"
      className={cn("text-sm text-danger", className)}
      {...props}
    >
      {children ??
        (required
          ? "Choose an answer to continue."
          : "Choose an answer or skip this question.")}
    </Text>
  )
}

function QuestionnaireActions({
  className,
  ...props
}: React.ComponentProps<typeof View> & React.RefAttributes<View>) {
  return (
    <View
      className={cn(
        "min-h-11 w-full flex-row items-center justify-end gap-2",
        className
      )}
      {...props}
    />
  )
}

type QuestionnaireNavigationProps = Omit<ButtonProps, "children"> & {
  children?: React.ReactNode
}

function NavigationButton({
  visible,
  action,
  label,
  children,
  className,
  onPress,
  ...props
}: QuestionnaireNavigationProps & {
  visible: boolean
  action: () => void
  label: string
}) {
  if (!visible) return null
  return (
    <Button
      className={cn("min-h-11", className)}
      onPress={(event) => {
        onPress?.(event)
        action()
      }}
      {...props}
    >
      {wrapText(children ?? label)}
    </Button>
  )
}

function QuestionnairePrevious({
  variant = "outline",
  className,
  ...props
}: QuestionnaireNavigationProps) {
  const { first, total, goPrevious } = useQuestionnaireContext(
    "QuestionnairePrevious"
  )
  return (
    <NavigationButton
      variant={variant}
      className={cn("me-auto", className)}
      visible={total > 1 && !first}
      action={goPrevious}
      label="Previous"
      {...props}
    />
  )
}

function QuestionnaireSkip({
  variant = "outline",
  ...props
}: QuestionnaireNavigationProps) {
  const { activeItemRequired, skipCurrent } =
    useQuestionnaireContext("QuestionnaireSkip")
  return (
    <NavigationButton
      variant={variant}
      visible={activeItemRequired === false}
      action={skipCurrent}
      label="Skip"
      {...props}
    />
  )
}

function QuestionnaireNext({
  variant = "default",
  ...props
}: QuestionnaireNavigationProps) {
  const { last, total, goNext } = useQuestionnaireContext("QuestionnaireNext")
  return (
    <NavigationButton
      variant={variant}
      visible={total > 1 && !last}
      action={goNext}
      label="Next"
      {...props}
    />
  )
}

function QuestionnaireSubmit({
  variant = "default",
  ...props
}: QuestionnaireNavigationProps) {
  const { last, total, submit } = useQuestionnaireContext("QuestionnaireSubmit")
  return (
    <NavigationButton
      variant={variant}
      visible={total > 0 && last}
      action={submit}
      label="Submit"
      {...props}
    />
  )
}

export type {
  QuestionnaireItemDefinition,
  QuestionnaireItemStatus,
  QuestionnaireState,
  QuestionnaireValues,
}
export {
  Questionnaire,
  QuestionnaireActions,
  QuestionnaireChoice,
  QuestionnaireChoiceDescription,
  QuestionnaireChoices,
  QuestionnaireDescription,
  QuestionnaireError,
  QuestionnaireInput,
  QuestionnaireItem,
  QuestionnaireNext,
  QuestionnairePrevious,
  QuestionnaireProgress,
  QuestionnaireSkip,
  QuestionnaireSubmit,
  QuestionnaireTitle,
  useQuestionnaire,
  useQuestionnaireContext,
}
```

4. Update the import paths to match your project.

**StyleSheet**

1. Install the dependencies:

```bash title="Terminal"
npx expo install phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`, `components/primitives/hooks.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/ui/questionnaire.tsx`:

```tsx title="stylesheet/components/ui/questionnaire.tsx"
import { CheckIcon } from "phosphor-react-native"
import * as React from "react"
import {
  type GestureResponderEvent,
  I18nManager,
  Pressable,
  type PressableStateCallbackType,
  type StyleProp,
  StyleSheet,
  type TextStyle,
  View,
  type ViewStyle,
} from "react-native"
import Animated, { Keyframe, ReduceMotion } from "react-native-reanimated"
import { useHaptics } from "@/components/primitives/haptics"
import { useEffectEvent } from "@/components/primitives/hooks"
import { Button, type ButtonProps } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { Text, TextStyleContext } from "@/components/ui/text"
import { fontSize, radius, useTheme } from "@/components/ui/theme"

type QuestionnaireItemStatus = "unanswered" | "answered" | "skipped"

type QuestionnaireItemDefinition = {
  name: string
  required?: boolean
  disabled?: boolean
}

type QuestionnaireValues = Record<string, string | string[]>

type QuestionnaireState = {
  current: number
  first: boolean
  last: boolean
  total: number
}

type QuestionnaireDirection = "forward" | "backward"

type QuestionnaireAnswer = { choices: string[]; text: string }

type ItemRecord = {
  name: string
  required: boolean
  disabled: boolean
  invalid: boolean
  multiple: boolean
}

type QuestionnaireInputType =
  | "text"
  | "email"
  | "number"
  | "tel"
  | "url"
  | "password"
  | "search"

type QuestionnaireContextValue = QuestionnaireState & {
  activeItemName: string | null
  activeItemRequired: boolean | null
  shownItemName: string | null
  direction: QuestionnaireDirection
  animated: boolean
  values: QuestionnaireValues
  goNext: () => void
  goPrevious: () => void
  skipCurrent: () => void
  submit: () => void
  reset: () => void
  registerItem: (record: ItemRecord) => () => void
  updateItem: (record: ItemRecord) => void
  answerOf: (name: string) => QuestionnaireAnswer
  statusOf: (name: string) => QuestionnaireItemStatus
  invalidOf: (name: string) => boolean
  requiredOf: (name: string) => boolean
  select: (
    name: string,
    value: string,
    selected: boolean,
    multiple: boolean
  ) => void
  setText: (name: string, text: string) => void
  setDefault: (
    name: string,
    answer: { choice?: string; text?: string },
    on: boolean
  ) => void
}

type QuestionnaireItemContextValue = {
  name: string
  multiple: boolean
  required: boolean
  disabled: boolean
  invalid: boolean
  status: QuestionnaireItemStatus
  answer: QuestionnaireAnswer
  titleId: string
}

type UseQuestionnaireParameters = {
  defaultItem?: string
  item?: string
  items?: readonly QuestionnaireItemDefinition[]
  onItemChange?: (item: string) => void
  onSubmit?: (values: QuestionnaireValues) => void
}

const EMPTY: QuestionnaireAnswer = { choices: [], text: "" }

const SHIFT = I18nManager.isRTL ? -48 : 48

const EASING_DURATION = 280

function slideIn(from: number) {
  return new Keyframe({
    0: { opacity: 0, transform: [{ translateX: from }] },
    100: { opacity: 1, transform: [{ translateX: 0 }] },
  })
    .duration(EASING_DURATION)
    .reduceMotion(ReduceMotion.System)
}

function slideOut(to: number) {
  return new Keyframe({
    0: { opacity: 1, transform: [{ translateX: 0 }] },
    100: { opacity: 0, transform: [{ translateX: to }] },
  })
    .duration(200)
    .reduceMotion(ReduceMotion.System)
}

const TRANSITIONS = {
  forward: { entering: slideIn(SHIFT), exiting: slideOut(-SHIFT) },
  backward: { entering: slideIn(-SHIFT), exiting: slideOut(SHIFT) },
}

const QuestionnaireContext =
  React.createContext<QuestionnaireContextValue | null>(null)

const QuestionnaireItemContext =
  React.createContext<QuestionnaireItemContextValue | null>(null)

function useQuestionnaireContext(component = "useQuestionnaireContext") {
  const context = React.useContext(QuestionnaireContext)
  if (!context) {
    throw new Error(`${component} must be used within a <Questionnaire />`)
  }
  return context
}

function useQuestionnaireItemContext(component: string) {
  const context = React.useContext(QuestionnaireItemContext)
  if (!context) {
    throw new Error(`${component} must be used within a <QuestionnaireItem />`)
  }
  return context
}

function hasAnswer(answer: QuestionnaireAnswer) {
  return answer.choices.length > 0 || answer.text.trim().length > 0
}

function wrapText(children: React.ReactNode, style?: StyleProp<TextStyle>) {
  if (typeof children === "string" || typeof children === "number") {
    return <Text style={style}>{children}</Text>
  }
  return children
}

function withAlpha(color: string, alpha: number) {
  if (!color.startsWith("#") || color.length !== 7) return color
  const r = Number.parseInt(color.slice(1, 3), 16)
  const g = Number.parseInt(color.slice(3, 5), 16)
  const b = Number.parseInt(color.slice(5, 7), 16)
  return `rgba(${r}, ${g}, ${b}, ${alpha})`
}

const styles = StyleSheet.create({
  root: { width: "100%", minWidth: 0, flexDirection: "column", gap: 24 },
  progress: { minHeight: 16, alignSelf: "flex-start" },
  progressText: { ...fontSize.xs, fontVariant: ["tabular-nums"] },
  item: { minWidth: 0, flexDirection: "column", gap: 20 },
  hidden: { display: "none" },
  title: { ...fontSize.base, fontWeight: "600" },
  description: { ...fontSize.sm, marginTop: -14 },
  choices: { minWidth: 0, gap: 12 },
  choice: {
    position: "relative",
    minHeight: 44,
    flexDirection: "row",
    alignItems: "flex-start",
    gap: 10,
    borderRadius: radius.xl,
    borderWidth: 1,
    paddingHorizontal: 16,
    paddingVertical: 12,
  },
  choiceChecked: {
    borderWidth: 2,
    paddingHorizontal: 15,
    paddingVertical: 11,
  },
  indicator: {
    marginTop: 4,
    width: 16,
    height: 16,
    flexShrink: 0,
    alignItems: "center",
    justifyContent: "center",
  },
  dot: { width: 8, height: 8, borderRadius: radius.full },
  dotDark: { width: 10, height: 10 },
  label: { minWidth: 0, flex: 1, gap: 4 },
  error: { ...fontSize.sm },
  actions: {
    minHeight: 44,
    width: "100%",
    flexDirection: "row",
    alignItems: "center",
    justifyContent: "flex-end",
    gap: 8,
  },
  navigation: { minHeight: 44 },
  previous: { marginEnd: "auto" },
})

function useQuestionnaire({
  defaultItem,
  item,
  items,
  onItemChange,
  onSubmit,
}: UseQuestionnaireParameters) {
  const [records, setRecords] = React.useState<ItemRecord[]>([])
  const [answers, setAnswers] = React.useState<
    Record<string, QuestionnaireAnswer>
  >({})
  const [defaults, setDefaults] = React.useState<
    Record<string, QuestionnaireAnswer>
  >({})
  const [skipped, setSkipped] = React.useState<Record<string, boolean>>({})
  const [attempted, setAttempted] = React.useState<Record<string, boolean>>({})
  const [uncontrolledItem, setUncontrolledItem] = React.useState<string | null>(
    defaultItem ?? null
  )
  const [submitRequest, setSubmitRequest] = React.useState(0)
  const defaultsRef = React.useRef(defaults)
  defaultsRef.current = defaults

  const controlled = item !== undefined
  const requested = controlled ? item : uncontrolledItem
  const definitionByName = React.useMemo(
    () => new Map((items ?? []).map((entry) => [entry.name, entry])),
    [items]
  )
  const recordByName = React.useMemo(
    () => new Map(records.map((record) => [record.name, record])),
    [records]
  )
  const sequence = React.useMemo(
    () =>
      (items ?? records)
        .filter((entry) => !entry.disabled)
        .map((entry) => entry.name),
    [items, records]
  )
  const activeItemName =
    requested !== null && sequence.includes(requested)
      ? requested
      : (sequence[0] ?? null)
  const index = activeItemName ? sequence.indexOf(activeItemName) : -1
  const total = sequence.length
  const current = index < 0 ? 0 : index + 1
  const first = total > 0 && index === 0
  const last = total > 0 && index === total - 1

  const [shownItemName, setShownItemName] = React.useState(activeItemName)
  const [lastDirection, setLastDirection] =
    React.useState<QuestionnaireDirection>("forward")
  const [animated, setAnimated] = React.useState(false)
  const shownIndex = shownItemName ? sequence.indexOf(shownItemName) : -1
  const direction: QuestionnaireDirection =
    shownItemName !== activeItemName && shownIndex >= 0 && index >= 0
      ? index > shownIndex
        ? "forward"
        : "backward"
      : lastDirection

  React.useLayoutEffect(() => {
    if (shownItemName === activeItemName) return
    setLastDirection(direction)
    setShownItemName(activeItemName)
  }, [shownItemName, activeItemName, direction])

  React.useEffect(() => {
    if (shownItemName !== null && !animated) setAnimated(true)
  }, [shownItemName, animated])

  const answerOf = React.useCallback(
    (name: string) => answers[name] ?? defaults[name] ?? EMPTY,
    [answers, defaults]
  )

  const statusOf = React.useCallback(
    (name: string): QuestionnaireItemStatus => {
      if (skipped[name]) return "skipped"
      return hasAnswer(answerOf(name)) ? "answered" : "unanswered"
    },
    [skipped, answerOf]
  )

  const requiredOf = React.useCallback(
    (name: string) => {
      const definition = definitionByName.get(name)
      if (definition) return !!definition.required
      return recordByName.get(name)?.required ?? false
    },
    [definitionByName, recordByName]
  )

  const satisfied = React.useCallback(
    (name: string) => {
      const record = recordByName.get(name)
      if (!record || record.disabled) return true
      const status = statusOf(name)
      if (status === "skipped" && !requiredOf(name)) return true
      return !record.invalid && status === "answered"
    },
    [recordByName, statusOf, requiredOf]
  )

  const invalidOf = React.useCallback(
    (name: string) => {
      const record = recordByName.get(name)
      if (!record || record.disabled) return false
      if (statusOf(name) === "skipped" && !requiredOf(name)) return false
      return record.invalid || (!!attempted[name] && !satisfied(name))
    },
    [recordByName, statusOf, requiredOf, attempted, satisfied]
  )

  const validate = React.useCallback(
    (name: string) => {
      setAttempted((state) => ({ ...state, [name]: true }))
      return satisfied(name)
    },
    [satisfied]
  )

  const navigate = React.useCallback(
    (name: string) => {
      if (name === activeItemName) return
      if (!controlled) setUncontrolledItem(name)
      onItemChange?.(name)
    },
    [activeItemName, controlled, onItemChange]
  )

  const values = React.useMemo(() => {
    const result: QuestionnaireValues = {}
    for (const name of sequence) {
      if (skipped[name]) continue
      const answer = answers[name] ?? defaults[name] ?? EMPTY
      if (!hasAnswer(answer)) continue
      if (recordByName.get(name)?.multiple) {
        result[name] = answer.text.trim()
          ? [...answer.choices, answer.text]
          : answer.choices
      } else {
        result[name] = answer.choices[0] ?? answer.text
      }
    }
    return result
  }, [sequence, skipped, answers, defaults, recordByName])

  const goPrevious = React.useCallback(() => {
    const previous = sequence[index - 1]
    if (previous) navigate(previous)
  }, [sequence, index, navigate])

  const goNext = React.useCallback(() => {
    const next = sequence[index + 1]
    if (!activeItemName || !next) return
    if (!validate(activeItemName)) return
    navigate(next)
  }, [sequence, index, activeItemName, validate, navigate])

  const submit = React.useCallback(() => {
    const invalid = sequence.find((name) => !validate(name))
    if (invalid) {
      navigate(invalid)
      return
    }
    onSubmit?.(values)
  }, [sequence, validate, navigate, onSubmit, values])

  const runSubmit = useEffectEvent(submit)

  React.useEffect(() => {
    if (submitRequest > 0) runSubmit()
  }, [submitRequest, runSubmit])

  const skipCurrent = React.useCallback(() => {
    if (!activeItemName || requiredOf(activeItemName)) return
    setAnswers((state) => ({ ...state, [activeItemName]: EMPTY }))
    setSkipped((state) => ({ ...state, [activeItemName]: true }))
    if (last) {
      setSubmitRequest((count) => count + 1)
      return
    }
    const next = sequence[index + 1]
    if (next) navigate(next)
  }, [activeItemName, requiredOf, last, sequence, index, navigate])

  const reset = React.useCallback(() => {
    setAnswers({})
    setSkipped({})
    setAttempted({})
    const target =
      defaultItem && sequence.includes(defaultItem) ? defaultItem : sequence[0]
    if (target) navigate(target)
  }, [defaultItem, sequence, navigate])

  const registerItem = React.useCallback((record: ItemRecord) => {
    setRecords((state) => [
      ...state.filter((entry) => entry.name !== record.name),
      record,
    ])
    return () => {
      setRecords((state) => state.filter((entry) => entry.name !== record.name))
    }
  }, [])

  const updateItem = React.useCallback((record: ItemRecord) => {
    setRecords((state) =>
      state.map((entry) => (entry.name === record.name ? record : entry))
    )
  }, [])

  const select = React.useCallback(
    (name: string, value: string, selected: boolean, multiple: boolean) => {
      setSkipped((state) => (state[name] ? { ...state, [name]: false } : state))
      setAnswers((state) => {
        const answer = state[name] ?? defaultsRef.current[name] ?? EMPTY
        const choices = !selected
          ? answer.choices.filter((entry) => entry !== value)
          : multiple
            ? answer.choices.includes(value)
              ? answer.choices
              : [...answer.choices, value]
            : [value]
        return { ...state, [name]: { ...answer, choices } }
      })
    },
    []
  )

  const setText = React.useCallback((name: string, text: string) => {
    if (text.trim()) {
      setSkipped((state) => (state[name] ? { ...state, [name]: false } : state))
    }
    setAnswers((state) => {
      const answer = state[name] ?? defaultsRef.current[name] ?? EMPTY
      return { ...state, [name]: { ...answer, text } }
    })
  }, [])

  const setDefault = React.useCallback(
    (name: string, answer: { choice?: string; text?: string }, on: boolean) => {
      setDefaults((state) => {
        const previous = state[name] ?? EMPTY
        const { choice, text } = answer
        const choices =
          choice === undefined
            ? previous.choices
            : on
              ? previous.choices.includes(choice)
                ? previous.choices
                : [...previous.choices, choice]
              : previous.choices.filter((entry) => entry !== choice)
        const nextText = text === undefined ? previous.text : on ? text : ""
        if (choices === previous.choices && nextText === previous.text) {
          return state
        }
        return { ...state, [name]: { choices, text: nextText } }
      })
    },
    []
  )

  const activeItemRequired =
    activeItemName === null ? null : requiredOf(activeItemName)

  const context = React.useMemo<QuestionnaireContextValue>(
    () => ({
      activeItemName,
      activeItemRequired,
      shownItemName,
      direction,
      animated,
      current,
      first,
      last,
      total,
      values,
      goNext,
      goPrevious,
      skipCurrent,
      submit,
      reset,
      registerItem,
      updateItem,
      answerOf,
      statusOf,
      invalidOf,
      requiredOf,
      select,
      setText,
      setDefault,
    }),
    [
      activeItemName,
      activeItemRequired,
      shownItemName,
      direction,
      animated,
      current,
      first,
      last,
      total,
      values,
      goNext,
      goPrevious,
      skipCurrent,
      submit,
      reset,
      registerItem,
      updateItem,
      answerOf,
      statusOf,
      invalidOf,
      requiredOf,
      select,
      setText,
      setDefault,
    ]
  )

  const state: QuestionnaireState = { current, first, last, total }

  return { context, state }
}

function Questionnaire({
  defaultItem,
  item,
  items,
  onItemChange,
  onSubmit,
  style,
  ...props
}: React.ComponentProps<typeof View> &
  React.RefAttributes<View> &
  UseQuestionnaireParameters) {
  const questionnaire = useQuestionnaire({
    defaultItem,
    item,
    items,
    onItemChange,
    onSubmit,
  })
  return (
    <QuestionnaireContext.Provider value={questionnaire.context}>
      <View style={[styles.root, style]} {...props} />
    </QuestionnaireContext.Provider>
  )
}

function QuestionnaireProgress({
  style,
  children,
  ...props
}: Omit<React.ComponentProps<typeof View>, "children"> &
  React.RefAttributes<View> & {
    children?:
      | React.ReactNode
      | ((state: QuestionnaireState) => React.ReactNode)
  }) {
  const { colors } = useTheme()
  const { current, first, last, total } = useQuestionnaireContext(
    "QuestionnaireProgress"
  )
  const text = total ? `Question ${current} of ${total}` : undefined
  const content =
    typeof children === "function"
      ? children({ current, first, last, total })
      : children
  const textStyle = [styles.progressText, { color: colors.labelSecondary }]
  return (
    <View
      role="progressbar"
      accessibilityLabel="Questionnaire progress"
      accessibilityLiveRegion="polite"
      accessibilityValue={
        total ? { min: 1, max: total, now: current, text } : undefined
      }
      style={[styles.progress, style]}
      {...props}
    >
      {content === undefined ? (
        <Text style={textStyle}>{text}</Text>
      ) : (
        wrapText(content, textStyle)
      )}
    </View>
  )
}

function QuestionnaireItem({
  name,
  required = false,
  disabled = false,
  invalid: invalidProp = false,
  multiple = false,
  onStatusChange,
  style,
  children,
  ...props
}: React.ComponentProps<typeof View> &
  React.RefAttributes<View> & {
    name: string
    required?: boolean
    disabled?: boolean
    invalid?: boolean
    multiple?: boolean
    onStatusChange?: (status: QuestionnaireItemStatus) => void
  }) {
  const root = useQuestionnaireContext("QuestionnaireItem")
  const titleId = React.useId()
  const record = React.useMemo<ItemRecord>(
    () => ({ name, required, disabled, invalid: invalidProp, multiple }),
    [name, required, disabled, invalidProp, multiple]
  )
  const recordRef = React.useRef(record)
  recordRef.current = record
  const { registerItem, updateItem } = root

  React.useLayoutEffect(
    () => registerItem({ ...recordRef.current, name }),
    [name, registerItem]
  )

  React.useLayoutEffect(() => {
    updateItem(record)
  }, [record, updateItem])

  const status = root.statusOf(name)
  const statusRef = React.useRef(status)
  React.useEffect(() => {
    if (statusRef.current === status) return
    statusRef.current = status
    onStatusChange?.(status)
  }, [status, onStatusChange])

  const answer = root.answerOf(name)
  const invalid = root.invalidOf(name)
  const context = React.useMemo<QuestionnaireItemContextValue>(
    () => ({
      name,
      multiple,
      required: root.requiredOf(name),
      disabled,
      invalid,
      status,
      answer,
      titleId,
    }),
    [
      name,
      multiple,
      root.requiredOf,
      disabled,
      invalid,
      status,
      answer,
      titleId,
    ]
  )
  const shown = !disabled && root.shownItemName === name
  const transition = TRANSITIONS[root.direction]

  return (
    <QuestionnaireItemContext.Provider value={context}>
      {shown ? (
        <Animated.View
          key="shown"
          role={multiple ? "group" : "radiogroup"}
          accessibilityLabelledBy={titleId}
          entering={root.animated ? transition.entering : undefined}
          exiting={transition.exiting}
          style={[styles.item, style]}
          {...props}
        >
          {children}
        </Animated.View>
      ) : (
        <View key="hidden" style={styles.hidden}>
          {children}
        </View>
      )}
    </QuestionnaireItemContext.Provider>
  )
}

function QuestionnaireTitle({
  style,
  ...props
}: Omit<React.ComponentProps<typeof Text>, "nativeID"> &
  React.RefAttributes<typeof Text>) {
  const { titleId } = useQuestionnaireItemContext("QuestionnaireTitle")
  return (
    <Text
      role="heading"
      nativeID={titleId}
      style={[styles.title, style]}
      {...props}
    />
  )
}

function QuestionnaireDescription({
  style,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  const { colors } = useTheme()
  useQuestionnaireItemContext("QuestionnaireDescription")
  return (
    <Text
      style={[styles.description, { color: colors.labelSecondary }, style]}
      {...props}
    />
  )
}

function QuestionnaireChoices({
  style,
  ...props
}: React.ComponentProps<typeof View> & React.RefAttributes<View>) {
  useQuestionnaireItemContext("QuestionnaireChoices")
  return <View style={[styles.choices, style]} {...props} />
}

function QuestionnaireChoice({
  value,
  checked,
  defaultChecked = false,
  disabled: disabledProp = false,
  onCheckedChange,
  style,
  children,
  onPress,
  ...props
}: Omit<React.ComponentProps<typeof Pressable>, "children" | "style"> &
  React.RefAttributes<View> & {
    value: string
    checked?: boolean
    defaultChecked?: boolean
    disabled?: boolean
    onCheckedChange?: (checked: boolean) => void
    children?: React.ReactNode
    style?:
      | StyleProp<ViewStyle>
      | ((state: PressableStateCallbackType) => StyleProp<ViewStyle>)
  }) {
  const { colors, isDark } = useTheme()
  const root = useQuestionnaireContext("QuestionnaireChoice")
  const item = useQuestionnaireItemContext("QuestionnaireChoice")
  const haptics = useHaptics()
  const { name, multiple } = item
  const disabled = item.disabled || disabledProp
  const isChecked =
    item.status !== "skipped" && item.answer.choices.includes(value)
  const { select, setDefault } = root

  React.useLayoutEffect(() => {
    if (!defaultChecked) return
    setDefault(name, { choice: value }, true)
    return () => setDefault(name, { choice: value }, false)
  }, [defaultChecked, name, value, setDefault])

  React.useLayoutEffect(() => {
    if (checked === undefined || checked === isChecked) return
    select(name, value, checked, multiple)
  }, [checked, isChecked, name, value, multiple, select])

  const handlePress = (event: GestureResponderEvent) => {
    onPress?.(event)
    if (disabled) return
    const next = multiple ? !isChecked : true
    if (next === isChecked) return
    onCheckedChange?.(next)
    if (checked !== undefined) return
    select(name, value, next, multiple)
    haptics.selection()
  }

  return (
    <Pressable
      role={multiple ? "checkbox" : "radio"}
      accessibilityState={{ checked: isChecked, disabled }}
      disabled={disabled}
      onPress={handlePress}
      style={(state) => [
        styles.choice,
        { borderColor: colors.separator },
        state.pressed && { backgroundColor: colors.itemPressed },
        item.invalid && {
          borderColor: colors.danger,
          backgroundColor: withAlpha(colors.danger, isDark ? 0.1 : 0.05),
        },
        isChecked && [styles.choiceChecked, { borderColor: colors.accent }],
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    >
      <View
        style={[
          styles.indicator,
          {
            borderRadius: multiple ? radius.xs : radius.full,
            backgroundColor: isChecked ? colors.accent : colors.labelQuaternary,
          },
        ]}
      >
        {isChecked ? (
          multiple ? (
            <Icon
              as={CheckIcon}
              weight="bold"
              size={14}
              color={colors.onAccent}
            />
          ) : (
            <View
              style={[
                styles.dot,
                isDark && styles.dotDark,
                { backgroundColor: colors.onAccent },
              ]}
            />
          )
        ) : null}
      </View>
      <TextStyleContext.Provider
        value={{
          ...fontSize.base,
          color: disabled ? colors.labelQuaternary : colors.label,
        }}
      >
        <View style={styles.label}>
          {React.Children.map(children, (child) => wrapText(child))}
        </View>
      </TextStyleContext.Provider>
    </Pressable>
  )
}

function QuestionnaireChoiceDescription({
  style,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  const { colors } = useTheme()
  return <Text style={[{ color: colors.labelSecondary }, style]} {...props} />
}

function inputTypeProps(
  type: QuestionnaireInputType
): Partial<React.ComponentProps<typeof Input>> {
  switch (type) {
    case "email":
      return {
        keyboardType: "email-address",
        autoCapitalize: "none",
        autoComplete: "email",
        textContentType: "emailAddress",
      }
    case "number":
      return { keyboardType: "numeric" }
    case "tel":
      return {
        keyboardType: "phone-pad",
        autoComplete: "tel",
        textContentType: "telephoneNumber",
      }
    case "url":
      return {
        keyboardType: "url",
        autoCapitalize: "none",
        textContentType: "URL",
      }
    case "password":
      return {
        secureTextEntry: true,
        autoCapitalize: "none",
        textContentType: "password",
      }
    case "search":
      return { returnKeyType: "search" }
    default:
      return {}
  }
}

function QuestionnaireInput({
  type = "text",
  value,
  defaultValue,
  onValueChange,
  disabled = false,
  style,
  accessibilityLabel,
  ...props
}: Omit<React.ComponentProps<typeof Input>, "name" | "required"> & {
  type?: QuestionnaireInputType
}) {
  const { colors, isDark } = useTheme()
  const root = useQuestionnaireContext("QuestionnaireInput")
  const item = useQuestionnaireItemContext("QuestionnaireInput")
  const { name } = item
  const { setText, setDefault } = root

  React.useLayoutEffect(() => {
    if (!defaultValue) return
    setDefault(name, { text: defaultValue }, true)
    return () => setDefault(name, { text: defaultValue }, false)
  }, [defaultValue, name, setDefault])

  React.useLayoutEffect(() => {
    if (value !== undefined) setText(name, value)
  }, [value, name, setText])

  return (
    <Input
      {...inputTypeProps(type)}
      value={value ?? item.answer.text}
      onValueChange={(next, details) => {
        onValueChange?.(next, details)
        if (value === undefined && !details.isCanceled) setText(name, next)
      }}
      disabled={item.disabled || disabled}
      accessibilityLabel={accessibilityLabel}
      accessibilityLabelledBy={
        accessibilityLabel === undefined ? item.titleId : undefined
      }
      style={(state) => [
        item.invalid && {
          borderColor: colors.danger,
          backgroundColor: withAlpha(colors.danger, isDark ? 0.1 : 0.05),
        },
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    />
  )
}

function QuestionnaireError({
  style,
  children,
  ...props
}: React.ComponentProps<typeof Text> & React.RefAttributes<typeof Text>) {
  const { colors } = useTheme()
  const { invalid, required } =
    useQuestionnaireItemContext("QuestionnaireError")
  if (!invalid) return null
  return (
    <Text
      role="alert"
      accessibilityLiveRegion="polite"
      style={[styles.error, { color: colors.danger }, style]}
      {...props}
    >
      {children ??
        (required
          ? "Choose an answer to continue."
          : "Choose an answer or skip this question.")}
    </Text>
  )
}

function QuestionnaireActions({
  style,
  ...props
}: React.ComponentProps<typeof View> & React.RefAttributes<View>) {
  return <View style={[styles.actions, style]} {...props} />
}

type QuestionnaireNavigationProps = Omit<ButtonProps, "children"> & {
  children?: React.ReactNode
}

function NavigationButton({
  visible,
  action,
  label,
  children,
  style,
  onPress,
  ...props
}: QuestionnaireNavigationProps & {
  visible: boolean
  action: () => void
  label: string
}) {
  if (!visible) return null
  return (
    <Button
      style={(state) => [
        styles.navigation,
        typeof style === "function" ? style(state) : style,
      ]}
      onPress={(event) => {
        onPress?.(event)
        action()
      }}
      {...props}
    >
      {wrapText(children ?? label)}
    </Button>
  )
}

function QuestionnairePrevious({
  variant = "outline",
  style,
  ...props
}: QuestionnaireNavigationProps) {
  const { first, total, goPrevious } = useQuestionnaireContext(
    "QuestionnairePrevious"
  )
  return (
    <NavigationButton
      variant={variant}
      style={(state) => [
        styles.previous,
        typeof style === "function" ? style(state) : style,
      ]}
      visible={total > 1 && !first}
      action={goPrevious}
      label="Previous"
      {...props}
    />
  )
}
function QuestionnaireSkip({
  variant = "outline",
  ...props
}: QuestionnaireNavigationProps) {
  const { activeItemRequired, skipCurrent } =
    useQuestionnaireContext("QuestionnaireSkip")
  return (
    <NavigationButton
      variant={variant}
      visible={activeItemRequired === false}
      action={skipCurrent}
      label="Skip"
      {...props}
    />
  )
}

function QuestionnaireNext({
  variant = "default",
  ...props
}: QuestionnaireNavigationProps) {
  const { last, total, goNext } = useQuestionnaireContext("QuestionnaireNext")
  return (
    <NavigationButton
      variant={variant}
      visible={total > 1 && !last}
      action={goNext}
      label="Next"
      {...props}
    />
  )
}

function QuestionnaireSubmit({
  variant = "default",
  ...props
}: QuestionnaireNavigationProps) {
  const { last, total, submit } = useQuestionnaireContext("QuestionnaireSubmit")
  return (
    <NavigationButton
      variant={variant}
      visible={total > 0 && last}
      action={submit}
      label="Submit"
      {...props}
    />
  )
}

export type {
  QuestionnaireItemDefinition,
  QuestionnaireItemStatus,
  QuestionnaireState,
  QuestionnaireValues,
}
export {
  Questionnaire,
  QuestionnaireActions,
  QuestionnaireChoice,
  QuestionnaireChoiceDescription,
  QuestionnaireChoices,
  QuestionnaireDescription,
  QuestionnaireError,
  QuestionnaireInput,
  QuestionnaireItem,
  QuestionnaireNext,
  QuestionnairePrevious,
  QuestionnaireProgress,
  QuestionnaireSkip,
  QuestionnaireSubmit,
  QuestionnaireTitle,
  useQuestionnaire,
  useQuestionnaireContext,
}
```

4. Update the import paths to match your project.

**SwiftUI**

1. Target iOS 17 or later.

2. Add the Swift package to your app:

```swift title="Package.swift"
.package(url: "https://github.com/phosphor-icons/swift", from: "2.1.0")
```

3. Copy the theme files every view uses:

```swift title="swift/Theme/Theme.swift"
import SwiftUI
import UIKit

struct RGBA: Sendable {
  let red: CGFloat
  let green: CGFloat
  let blue: CGFloat
  let alpha: CGFloat

  init(_ hex: UInt32, _ alpha: CGFloat = 1) {
    red = CGFloat((hex >> 16) & 0xFF) / 255
    green = CGFloat((hex >> 8) & 0xFF) / 255
    blue = CGFloat(hex & 0xFF) / 255
    self.alpha = alpha
  }

  var uiColor: UIColor {
    UIColor(red: red, green: green, blue: blue, alpha: alpha)
  }
}

extension Color {
  static func adaptive(light: RGBA, dark: RGBA) -> Color {
    let lightColor = light.uiColor
    let darkColor = dark.uiColor
    return Color(uiColor: UIColor { traits in
      traits.userInterfaceStyle == .dark ? darkColor : lightColor
    })
  }
}

public struct TextStyle: Sendable, Hashable {
  public let size: CGFloat
  public let lineHeight: CGFloat
  public let letterSpacing: CGFloat

  public init(size: CGFloat, lineHeight: CGFloat, letterSpacing: CGFloat) {
    self.size = size
    self.lineHeight = lineHeight
    self.letterSpacing = letterSpacing
  }

  public func font(weight: Font.Weight = .regular) -> Font {
    .system(size: size, weight: weight)
  }

  public var lineSpacing: CGFloat {
    max(0, lineHeight - UIFont.systemFont(ofSize: size).lineHeight)
  }
}

extension Hashable where Self == Font {
  public static func textStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> Font {
    style.font(weight: weight)
  }
}

private struct TextStyleModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  func body(content: Content) -> some View {
    content
      .font(style.font(weight: weight))
      .tracking(style.letterSpacing)
      .lineSpacing(style.lineSpacing)
      .padding(.vertical, style.lineSpacing / 2)
  }
}

extension View {
  public func textStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(TextStyleModifier(style: style, weight: weight))
  }
}

public struct Shadow: Sendable, Hashable {
  public let color: Color
  public let radius: CGFloat
  public let x: CGFloat
  public let y: CGFloat

  public init(color: Color, radius: CGFloat, x: CGFloat = 0, y: CGFloat = 0) {
    self.color = color
    self.radius = radius
    self.x = x
    self.y = y
  }
}

extension View {
  public func shadow(_ shadow: Shadow) -> some View {
    self.shadow(color: shadow.color, radius: shadow.radius, x: shadow.x, y: shadow.y)
  }
}
```

```swift title="swift/Theme/Tokens.swift"
import SwiftUI

extension Color {
  public static let surface = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x000000))
  public static let surfaceSecondary = Color.adaptive(light: .init(0xF5F5F7), dark: .init(0x161617))
  public static let surfaceTertiary = Color.adaptive(light: .init(0xE8E8ED), dark: .init(0x2C2C2E))
  public static let surfaceRaised = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x1D1D1F))
  public static let label = Color.adaptive(light: .init(0x1D1D1F), dark: .init(0xF5F5F7))
  public static let labelSecondary = Color.adaptive(light: .init(0x6E6E73), dark: .init(0xA1A1A6))
  public static let labelTertiary = Color.adaptive(light: .init(0x86868B), dark: .init(0x86868B))
  public static let labelQuaternary = Color.adaptive(light: .init(0xD2D2D7), dark: .init(0x424245))
  public static let control = Color.adaptive(light: .init(0x000000, 0.04), dark: .init(0xFFFFFF, 0.1))
  public static let controlPressed = Color.adaptive(light: .init(0x000000, 0.12), dark: .init(0xFFFFFF, 0.22))
  public static let controlSelected = Color.adaptive(light: .init(0x1D1D1F), dark: .init(0xF5F5F7))
  public static let controlDisabled = Color.adaptive(light: .init(0x000000, 0.03), dark: .init(0xFFFFFF, 0.05))
  public static let onControlSelected = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x000000))
  public static let itemPressed = Color.adaptive(light: .init(0x000000, 0.08), dark: .init(0xFFFFFF, 0.12))
  public static let itemSelected = Color.adaptive(light: .init(0x000000, 0.06), dark: .init(0xFFFFFF, 0.1))
  public static let separator = Color.adaptive(light: .init(0xD2D2D7), dark: .init(0x424245))
  public static let separatorStrong = Color.adaptive(light: .init(0x86868B), dark: .init(0x6E6E73))
  public static let accent = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let accentPressed = Color.adaptive(light: .init(0x005BB8), dark: .init(0x004D9E))
  public static let accentSelected = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let accentDisabled = Color.adaptive(light: .init(0x0071E3, 0.4), dark: .init(0x0071E3, 0.4))
  public static let onAccent = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0xFFFFFF))
  public static let accentSurface = Color.adaptive(light: .init(0x0071E3, 0.09), dark: .init(0x0071E3, 0.18))
  public static let accentSurfacePressed = Color.adaptive(light: .init(0x0071E3, 0.18), dark: .init(0x0071E3, 0.3))
  public static let link = Color.adaptive(light: .init(0x0066CC), dark: .init(0x2997FF))
  public static let focus = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let scrim = Color.adaptive(light: .init(0x000000, 0.48), dark: .init(0x000000, 0.48))
  public static let media = Color.adaptive(light: .init(0x000000), dark: .init(0x000000))
  public static let onMedia = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0xFFFFFF))
  public static let danger = Color.adaptive(light: .init(0xD0000A), dark: .init(0xFF5447))
  public static let dangerSurface = Color.adaptive(light: .init(0xD70015, 0.08), dark: .init(0xFF453A, 0.2))
  public static let dangerSurfacePressed = Color.adaptive(light: .init(0xD70015, 0.16), dark: .init(0xFF453A, 0.36))
  public static let success = Color.adaptive(light: .init(0x008009), dark: .init(0x30D158))
  public static let successSurface = Color.adaptive(light: .init(0xEFFAF1), dark: .init(0x30D158, 0.16))
  public static let warning = Color.adaptive(light: .init(0xB64400), dark: .init(0xFF9F0A))
  public static let warningSurface = Color.adaptive(light: .init(0xFFF5EA), dark: .init(0xFF9F0A, 0.16))
}

public enum Radius {
  public static let xs: CGFloat = 3
  public static let sm: CGFloat = 5
  public static let md: CGFloat = 8
  public static let lg: CGFloat = 10
  public static let xl: CGFloat = 12
  public static let xl2: CGFloat = 18
  public static let xl3: CGFloat = 28
  public static let full: CGFloat = 9999
}

extension TextStyle {
  public static let xs3 = TextStyle(size: 11, lineHeight: 13, letterSpacing: 0.066)
  public static let xs2 = TextStyle(size: 12, lineHeight: 16, letterSpacing: 0)
  public static let xs = TextStyle(size: 13, lineHeight: 18, letterSpacing: -0.078)
  public static let sm = TextStyle(size: 15, lineHeight: 20, letterSpacing: -0.24)
  public static let md = TextStyle(size: 16, lineHeight: 21, letterSpacing: -0.32)
  public static let base = TextStyle(size: 17, lineHeight: 22, letterSpacing: -0.442)
  public static let lg = TextStyle(size: 20, lineHeight: 25, letterSpacing: -0.46)
  public static let xl = TextStyle(size: 22, lineHeight: 28, letterSpacing: -0.264)
  public static let xl2 = TextStyle(size: 28, lineHeight: 34, letterSpacing: 0.392)
  public static let xl3 = TextStyle(size: 34, lineHeight: 41, letterSpacing: 0.408)

  public static let allCases: [TextStyle] = [.xs3, .xs2, .xs, .sm, .md, .base, .lg, .xl, .xl2, .xl3]
}

extension Shadow {
  public static let md = Shadow(color: .black.opacity(0.08), radius: 6, x: 2, y: 4)
  public static let lg = Shadow(color: .black.opacity(0.12), radius: 12, y: 4)
}
```

4. Copy the source and every file it uses:

```swift title="swift/Components/Questionnaire.swift"
import Observation
import PhosphorSwift
import SwiftUI

public enum QuestionnaireItemStatus: CaseIterable, Sendable {
  case unanswered, answered, skipped
}

public enum QuestionnaireDirection: Sendable {
  case forward, backward
}

public struct QuestionnaireItemDefinition: Hashable, Sendable {
  public var name: String
  public var required: Bool
  public var multiple: Bool
  public var disabled: Bool
  public var invalid: Bool

  public init(_ name: String, required: Bool = false, multiple: Bool = false, disabled: Bool = false, invalid: Bool = false) {
    self.name = name
    self.required = required
    self.multiple = multiple
    self.disabled = disabled
    self.invalid = invalid
  }
}

@MainActor
@Observable
public final class QuestionnaireController {
  public private(set) var activeItem: String?
  public private(set) var direction: QuestionnaireDirection = .forward
  public var values: [String: [String]]

  public var onItemChange: ((String) -> Void)?
  public var onSubmit: (([String: [String]]) -> Void)?

  private(set) var registered: [QuestionnaireItemDefinition] = []
  private(set) var skipped: Set<String> = []
  private(set) var attempted: Set<String> = []

  @ObservationIgnored private let explicitItems: [QuestionnaireItemDefinition]?
  @ObservationIgnored private let defaultItem: String?
  @ObservationIgnored private let defaultValues: [String: [String]]

  public init(
    items: [QuestionnaireItemDefinition]? = nil,
    defaultItem: String? = nil,
    defaultValues: [String: [String]] = [:]
  ) {
    explicitItems = items
    self.defaultItem = defaultItem
    self.defaultValues = defaultValues
    values = defaultValues
    activeItem = QuestionnaireController.initialItem(in: items ?? [], preferred: defaultItem)
  }

  var definitions: [QuestionnaireItemDefinition] {
    explicitItems ?? registered
  }

  public var sequence: [String] {
    definitions.filter { !$0.disabled }.map(\.name)
  }

  public var total: Int { sequence.count }

  var index: Int? {
    guard let activeItem else { return nil }
    return sequence.firstIndex(of: activeItem)
  }

  public var current: Int { index.map { $0 + 1 } ?? 0 }

  public var isFirst: Bool { total > 0 && index == 0 }

  public var isLast: Bool { total > 0 && index == total - 1 }

  public var activeItemRequired: Bool? {
    guard let activeItem, index != nil else { return nil }
    return definition(activeItem)?.required ?? false
  }

  public var activeItemStatus: QuestionnaireItemStatus? {
    guard let activeItem, index != nil else { return nil }
    return status(of: activeItem)
  }

  func definition(_ name: String) -> QuestionnaireItemDefinition? {
    definitions.first { $0.name == name }
  }

  public func status(of name: String) -> QuestionnaireItemStatus {
    if skipped.contains(name) { return .skipped }
    return hasAnswer(name) ? .answered : .unanswered
  }

  func hasAnswer(_ name: String) -> Bool {
    (values[name] ?? []).contains { !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }
  }

  func isSatisfied(_ name: String) -> Bool {
    let definition = definition(name) ?? QuestionnaireItemDefinition(name)
    if definition.disabled { return true }
    let status = status(of: name)
    if status == .skipped && !definition.required { return true }
    return !definition.invalid && status == .answered
  }

  public func isInvalid(_ name: String) -> Bool {
    let definition = definition(name) ?? QuestionnaireItemDefinition(name)
    if definition.disabled { return false }
    if status(of: name) == .skipped && !definition.required { return false }
    return definition.invalid || (attempted.contains(name) && !isSatisfied(name))
  }

  public func isSelected(_ value: String, in name: String) -> Bool {
    !skipped.contains(name) && (values[name] ?? []).contains(value)
  }

  public func select(_ value: String, in name: String, selected: Bool = true) {
    guard let definition = definition(name), !definition.disabled else { return }
    skipped.remove(name)
    var current = values[name] ?? []
    if !selected {
      current.removeAll { $0 == value }
    } else if definition.multiple {
      if !current.contains(value) { current.append(value) }
    } else {
      current = [value]
    }
    values[name] = current
  }

  public func toggle(_ value: String, in name: String) {
    let multiple = definition(name)?.multiple ?? false
    let selected = isSelected(value, in: name)
    select(value, in: name, selected: multiple ? !selected : true)
  }

  public func text(for name: String) -> String {
    values[name]?.first ?? ""
  }

  public func setText(_ text: String, for name: String) {
    if !text.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty { skipped.remove(name) }
    values[name] = [text]
  }

  @discardableResult
  public func validate(_ name: String) -> Bool {
    attempted.insert(name)
    return isSatisfied(name)
  }

  public func go(to name: String) {
    guard name != activeItem, sequence.contains(name) else { return }
    let from = index ?? -1
    let to = sequence.firstIndex(of: name) ?? 0
    direction = to >= from ? .forward : .backward
    activeItem = name
    onItemChange?(name)
  }

  public func goPrevious() {
    guard let index, index > 0 else { return }
    go(to: sequence[index - 1])
  }

  @discardableResult
  public func goNext() -> Bool {
    guard let index, let activeItem, index + 1 < sequence.count else { return false }
    guard validate(activeItem) else { return false }
    go(to: sequence[index + 1])
    return true
  }

  @discardableResult
  public func advance() -> Bool {
    guard let activeItem else { return false }
    guard validate(activeItem) else { return false }
    if isLast { return submit() }
    return goNext()
  }

  @discardableResult
  public func skip() -> Bool {
    guard let activeItem, let index, activeItemRequired == false else { return false }
    values[activeItem] = []
    skipped.insert(activeItem)
    if index + 1 < sequence.count {
      go(to: sequence[index + 1])
      return true
    }
    return submit()
  }

  @discardableResult
  public func submit() -> Bool {
    for name in sequence where !validate(name) {
      go(to: name)
      return false
    }
    onSubmit?(answers)
    return true
  }

  public var answers: [String: [String]] {
    var result: [String: [String]] = [:]
    for name in sequence where !skipped.contains(name) {
      let entries = (values[name] ?? []).filter { !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }
      if !entries.isEmpty { result[name] = entries }
    }
    return result
  }

  public func reset() {
    values = defaultValues
    skipped = []
    attempted = []
    if let target = QuestionnaireController.initialItem(in: definitions, preferred: defaultItem) {
      go(to: target)
    }
  }

  func register(_ items: [QuestionnaireItemDefinition]) {
    var seen = Set<String>()
    let unique = items.filter { seen.insert($0.name).inserted }
    if unique != registered { registered = unique }
    guard explicitItems == nil else { return }
    if index == nil, let target = QuestionnaireController.initialItem(in: unique, preferred: activeItem ?? defaultItem) {
      if activeItem == nil {
        activeItem = target
      } else {
        go(to: target)
      }
    }
  }

  static func initialItem(in items: [QuestionnaireItemDefinition], preferred: String?) -> String? {
    if let preferred, let match = items.first(where: { $0.name == preferred }), !match.disabled {
      return match.name
    }
    return items.first { !$0.disabled }?.name
  }
}

struct QuestionnaireItemsKey: PreferenceKey {
  static var defaultValue: [QuestionnaireItemDefinition] { [] }

  static func reduce(value: inout [QuestionnaireItemDefinition], nextValue: () -> [QuestionnaireItemDefinition]) {
    value.append(contentsOf: nextValue())
  }
}

struct QuestionnaireSlotKey: LayoutValueKey {
  static let defaultValue = false
}

struct QuestionnaireItemContext {
  var name: String
  var multiple: Bool
  var invalid: Bool
  var disabled: Bool
}

extension EnvironmentValues {
  @Entry var questionnaire: QuestionnaireController?
  @Entry var questionnaireDisplayed: String?
  @Entry var questionnaireItem: QuestionnaireItemContext?
}

struct QuestionnaireLayout: Layout {
  let spacing: CGFloat

  private func rows(_ subviews: Subviews, width: CGFloat?) -> [(indices: [Int], height: CGFloat)] {
    var rows: [(indices: [Int], height: CGFloat)] = []
    var slot: Int?
    for (offset, subview) in subviews.enumerated() {
      let size = subview.sizeThatFits(ProposedViewSize(width: width, height: nil))
      if subview[QuestionnaireSlotKey.self] {
        if let slot {
          rows[slot].indices.append(offset)
          rows[slot].height = max(rows[slot].height, size.height)
        } else {
          slot = rows.count
          rows.append((indices: [offset], height: size.height))
        }
      } else {
        rows.append((indices: [offset], height: size.height))
      }
    }
    return rows
  }

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    let visible = rows(subviews, width: proposal.width).filter { $0.height > 0 }
    let height = visible.reduce(0) { $0 + $1.height } + spacing * CGFloat(max(visible.count - 1, 0))
    let width = proposal.width ?? subviews.map { $0.sizeThatFits(.unspecified).width }.max() ?? 0
    return CGSize(width: width, height: height)
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    var y = bounds.minY
    for row in rows(subviews, width: bounds.width) {
      for index in row.indices {
        subviews[index].place(
          at: CGPoint(x: bounds.minX, y: y),
          anchor: .topLeading,
          proposal: ProposedViewSize(width: bounds.width, height: nil)
        )
      }
      if row.height > 0 { y += row.height + spacing }
    }
  }
}

public struct Questionnaire<Content: View>: View {
  let controller: QuestionnaireController
  let content: Content

  @State private var displayed: String?
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(controller: QuestionnaireController, @ViewBuilder content: () -> Content) {
    self.controller = controller
    self.content = content()
    _displayed = State(initialValue: controller.activeItem)
  }

  public var body: some View {
    let controller = controller
    QuestionnaireLayout(spacing: 24) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .environment(\.questionnaire, controller)
    .environment(\.questionnaireDisplayed, displayed ?? controller.activeItem)
    .onPreferenceChange(QuestionnaireItemsKey.self) { items in
      MainActor.assumeIsolated { controller.register(items) }
    }
    .onChange(of: controller.activeItem) { _, name in
      let animation: Animation = reduceMotion ? .linear(duration: 0.2) : .timingCurve(0.32, 0.72, 0, 1, duration: 0.45)
      withAnimation(animation) { displayed = name }
    }
  }
}

public struct QuestionnaireProgress<Label: View>: View {
  let label: (Int, Int) -> Label

  @Environment(\.questionnaire) private var questionnaire

  public init(@ViewBuilder label: @escaping (_ current: Int, _ total: Int) -> Label) {
    self.label = label
  }

  public var body: some View {
    let current = questionnaire?.current ?? 0
    let total = questionnaire?.total ?? 0
    label(current, total)
      .scaledFont(.xs)
      .monospacedDigit()
      .foregroundStyle(Color.labelSecondary)
      .frame(minHeight: TextStyle.xs.lineHeight, alignment: .leading)
      .accessibilityElement(children: .ignore)
      .accessibilityLabel(Text("Questionnaire progress"))
      .accessibilityValue(total > 0 ? Text("Question \(current) of \(total)") : Text(verbatim: ""))
  }
}

extension QuestionnaireProgress where Label == Text {
  public init() {
    self.init { current, total in
      total > 0 ? Text("Question \(current) of \(total)") : Text(verbatim: " ")
    }
  }
}

public struct QuestionnaireItem<Content: View>: View {
  let definition: QuestionnaireItemDefinition
  let onStatusChange: ((QuestionnaireItemStatus) -> Void)?
  let content: Content

  @Environment(\.questionnaire) private var questionnaire
  @Environment(\.questionnaireDisplayed) private var displayed

  public init(
    name: String,
    required: Bool = false,
    multiple: Bool = false,
    disabled: Bool = false,
    invalid: Bool = false,
    onStatusChange: ((QuestionnaireItemStatus) -> Void)? = nil,
    @ViewBuilder content: () -> Content
  ) {
    definition = QuestionnaireItemDefinition(name, required: required, multiple: multiple, disabled: disabled, invalid: invalid)
    self.onStatusChange = onStatusChange
    self.content = content()
  }

  public var body: some View {
    let name = definition.name
    let active = !definition.disabled && displayed == name
    let forward = questionnaire?.direction != .backward
    let multiple = questionnaire?.definition(name)?.multiple ?? definition.multiple
    let invalid = questionnaire?.isInvalid(name) ?? definition.invalid
    let status = questionnaire?.status(of: name) ?? .unanswered
    ZStack(alignment: .topLeading) {
      if active {
        VStack(alignment: .leading, spacing: 20) {
          content
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .environment(\.questionnaireItem, QuestionnaireItemContext(name: name, multiple: multiple, invalid: invalid, disabled: definition.disabled))
        .environment(\.isInvalid, invalid)
        .accessibilityElement(children: .contain)
        .transition(
          .asymmetric(
            insertion: .move(edge: forward ? .trailing : .leading),
            removal: .move(edge: forward ? .leading : .trailing)
          )
          .combined(with: .opacity)
        )
      }
    }
    .layoutValue(key: QuestionnaireSlotKey.self, value: true)
    .preference(key: QuestionnaireItemsKey.self, value: [definition])
    .onChange(of: status) { _, value in onStatusChange?(value) }
  }
}

public struct QuestionnaireTitle: View {
  let text: Text

  public init(_ title: LocalizedStringKey) {
    text = Text(title)
  }

  public init(verbatim title: String) {
    text = Text(verbatim: title)
  }

  public var body: some View {
    text
      .scaledTextStyle(.base, weight: .semibold)
      .foregroundStyle(Color.label)
      .fixedSize(horizontal: false, vertical: true)
      .accessibilityAddTraits(.isHeader)
  }
}

public struct QuestionnaireDescription: View {
  let text: Text

  public init(_ description: LocalizedStringKey) {
    text = Text(description)
  }

  public init(verbatim description: String) {
    text = Text(verbatim: description)
  }

  public var body: some View {
    text
      .scaledTextStyle(.sm)
      .foregroundStyle(Color.labelSecondary)
      .fixedSize(horizontal: false, vertical: true)
      .padding(.top, -16)
  }
}

public struct QuestionnaireChoices<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 12) {
      content
    }
    .accessibilityElement(children: .contain)
  }
}

public struct QuestionnaireChoice<Label: View>: View {
  let value: String
  let disabled: Bool
  let label: Label

  @Environment(\.questionnaire) private var questionnaire
  @Environment(\.questionnaireItem) private var item
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.colorScheme) private var colorScheme
  @State private var taps = 0

  public init(value: String, disabled: Bool = false, @ViewBuilder label: () -> Label) {
    self.value = value
    self.disabled = disabled
    self.label = label()
  }

  public var body: some View {
    let name = item?.name ?? ""
    let multiple = item?.multiple ?? false
    let checked = questionnaire?.isSelected(value, in: name) ?? false
    let invalid = item?.invalid ?? false
    let enabled = isEnabled && !disabled && !(item?.disabled ?? false)
    Button {
      questionnaire?.toggle(value, in: name)
      taps += 1
    } label: {
      HStack(alignment: .firstTextBaseline, spacing: 10) {
        indicator(checked: checked, multiple: multiple, enabled: enabled)
          .alignmentGuide(.firstTextBaseline) { $0[VerticalAlignment.center] + 5 }
        VStack(alignment: .leading, spacing: 4) {
          label
        }
        .scaledFont(.base)
        .foregroundStyle(enabled ? Color.label : .labelQuaternary)
        .frame(maxWidth: .infinity, alignment: .leading)
        .fixedSize(horizontal: false, vertical: true)
      }
      .padding(.horizontal, 16)
      .padding(.vertical, 12)
      .frame(minHeight: 44)
      .contentShape(RoundedRectangle(cornerRadius: Radius.xl, style: .continuous))
    }
    .buttonStyle(QuestionnaireChoiceStyle(checked: checked, invalid: invalid, dark: colorScheme == .dark))
    .disabled(!enabled)
    .hapticFeedback(.selection, trigger: taps)
    .accessibilityAddTraits(checked ? .isSelected : [])
  }

  @ViewBuilder
  private func indicator(checked: Bool, multiple: Bool, enabled: Bool) -> some View {
    let shape = RoundedRectangle(cornerRadius: multiple ? Radius.xs : 8, style: .continuous)
    ZStack {
      shape.fill(checked ? (enabled ? Color.accent : .accentDisabled) : .labelQuaternary)
      if checked {
        if multiple {
          Ph.check.bold
            .frame(width: 12, height: 12)
            .foregroundStyle(Color.onAccent)
        } else {
          Circle()
            .fill(Color.onAccent)
            .frame(width: colorScheme == .dark ? 10 : 8, height: colorScheme == .dark ? 10 : 8)
        }
      }
    }
    .frame(width: 16, height: 16)
    .accessibilityHidden(true)
  }
}

extension QuestionnaireChoice where Label == Text {
  public init(_ title: LocalizedStringKey, value: String, disabled: Bool = false) {
    self.init(value: value, disabled: disabled) { Text(title) }
  }

  public init(verbatim title: String, value: String, disabled: Bool = false) {
    self.init(value: value, disabled: disabled) { Text(verbatim: title) }
  }
}

private struct QuestionnaireChoiceStyle: ButtonStyle {
  let checked: Bool
  let invalid: Bool
  let dark: Bool

  func makeBody(configuration: Configuration) -> some View {
    let shape = RoundedRectangle(cornerRadius: Radius.xl, style: .continuous)
    configuration.label
      .background {
        shape.fill(fill(pressed: configuration.isPressed))
      }
      .overlay {
        shape.strokeBorder(border, lineWidth: checked && !invalid ? 2 : 1)
      }
      .animation(.easeOut(duration: 0.15), value: checked)
  }

  private func fill(pressed: Bool) -> Color {
    if invalid { return Color.danger.opacity(dark ? 0.1 : 0.05) }
    return pressed ? .itemPressed : .clear
  }

  private var border: Color {
    if invalid { return .danger }
    return checked ? .accent : .separator
  }
}

public struct QuestionnaireChoiceDescription: View {
  let text: Text

  public init(_ description: LocalizedStringKey) {
    text = Text(description)
  }

  public init(verbatim description: String) {
    text = Text(verbatim: description)
  }

  public var body: some View {
    text
      .foregroundStyle(Color.labelSecondary)
      .fixedSize(horizontal: false, vertical: true)
  }
}

public struct QuestionnaireInput: View {
  let placeholder: Text
  let keyboard: UIKeyboardType
  let contentType: UITextContentType?
  let disabled: Bool

  @Environment(\.questionnaire) private var questionnaire
  @Environment(\.questionnaireItem) private var item
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.colorScheme) private var colorScheme

  public init(
    _ placeholder: LocalizedStringResource = "",
    keyboard: UIKeyboardType = .default,
    contentType: UITextContentType? = nil,
    disabled: Bool = false
  ) {
    self.placeholder = Text(verbatim: String(localized: placeholder))
    self.keyboard = keyboard
    self.contentType = contentType
    self.disabled = disabled
  }

  public var body: some View {
    let name = item?.name ?? ""
    let invalid = item?.invalid ?? false
    let enabled = isEnabled && !disabled && !(item?.disabled ?? false)
    let controller = questionnaire
    let shape = RoundedRectangle(cornerRadius: Radius.lg, style: .continuous)
    TextField(
      text: Binding(
        get: { controller?.text(for: name) ?? "" },
        set: { controller?.setText($0, for: name) }
      ),
      prompt: placeholder.foregroundStyle(Color.labelSecondary)
    ) {
      placeholder
    }
    .keyboardType(keyboard)
    .textContentType(contentType)
    .textInputAutocapitalization(keyboard == .emailAddress || keyboard == .URL ? .never : nil)
    .autocorrectionDisabled(keyboard == .emailAddress || keyboard == .URL)
    .submitLabel(controller?.isLast == true ? .done : .next)
    .onSubmit { controller?.advance() }
    .scaledFont(.base)
    .foregroundStyle(enabled ? Color.label : .labelQuaternary)
    .tint(Color.accent)
    .padding(.horizontal, 12)
    .frame(height: 44)
    .background(invalid ? Color.danger.opacity(colorScheme == .dark ? 0.1 : 0.05) : .control, in: shape)
    .overlay { shape.strokeBorder(invalid ? Color.danger : .clear, lineWidth: 1) }
    .disabled(!enabled)
  }
}

public struct QuestionnaireError: View {
  let text: Text?

  @Environment(\.questionnaire) private var questionnaire
  @Environment(\.questionnaireItem) private var item

  public init() {
    text = nil
  }

  public init(_ message: LocalizedStringKey) {
    text = Text(message)
  }

  public init(verbatim message: String) {
    text = Text(verbatim: message)
  }

  public var body: some View {
    let name = item?.name ?? ""
    let invalid = item?.invalid ?? false
    let required = questionnaire?.definition(name)?.required ?? false
    if invalid {
      (text ?? (required ? Text("Choose an answer to continue.") : Text("Choose an answer or skip this question.")))
        .scaledTextStyle(.sm)
        .foregroundStyle(Color.danger)
        .fixedSize(horizontal: false, vertical: true)
        .transition(.opacity)
        .onAppear {
          AccessibilityNotification.Announcement(
            String(localized: required ? "Choose an answer to continue." : "Choose an answer or skip this question.")
          ).post()
        }
    }
  }
}

public struct QuestionnaireActions<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    QuestionnaireActionsLayout(spacing: 8) {
      content
    }
    .frame(maxWidth: .infinity, minHeight: 44)
  }
}

struct QuestionnaireActionPlacementKey: LayoutValueKey {
  static let defaultValue = QuestionnaireActionPlacement.end
}

enum QuestionnaireActionPlacement {
  case start, end
}

struct QuestionnaireActionsLayout: Layout {
  let spacing: CGFloat

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    let sizes = subviews.map { $0.sizeThatFits(.unspecified) }.filter { $0.width > 0 }
    let height = sizes.map(\.height).max() ?? 0
    let width = sizes.reduce(0) { $0 + $1.width } + spacing * CGFloat(max(sizes.count - 1, 0))
    return CGSize(width: proposal.width ?? width, height: height)
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    var leading = bounds.minX
    var trailing = bounds.maxX
    for subview in subviews where subview[QuestionnaireActionPlacementKey.self] == .start {
      let size = subview.sizeThatFits(.unspecified)
      guard size.width > 0 else { continue }
      subview.place(at: CGPoint(x: leading, y: bounds.midY), anchor: .leading, proposal: ProposedViewSize(size))
      leading += size.width + spacing
    }
    for subview in subviews.reversed() where subview[QuestionnaireActionPlacementKey.self] == .end {
      let size = subview.sizeThatFits(.unspecified)
      guard size.width > 0 else { continue }
      subview.place(at: CGPoint(x: trailing, y: bounds.midY), anchor: .trailing, proposal: ProposedViewSize(size))
      trailing -= size.width + spacing
    }
  }
}

private struct QuestionnaireNavigationButton: View {
  let title: Text
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size
  let visible: Bool
  let action: () -> Void

  var body: some View {
    if visible {
      Button(action: action) { title }
        .buttonStyle(.variant(variant, size: size))
        .transition(.opacity)
    }
  }
}

public struct QuestionnairePrevious: View {
  let title: Text
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size

  @Environment(\.questionnaire) private var questionnaire

  public init(_ title: LocalizedStringKey = "Previous", variant: VariantButtonStyle.Variant = .outline, size: VariantButtonStyle.Size = .default) {
    self.title = Text(title)
    self.variant = variant
    self.size = size
  }

  public var body: some View {
    let visible = (questionnaire?.total ?? 0) > 1 && questionnaire?.isFirst == false
    QuestionnaireNavigationButton(title: title, variant: variant, size: size, visible: visible) {
      questionnaire?.goPrevious()
    }
    .layoutValue(key: QuestionnaireActionPlacementKey.self, value: .start)
  }
}

public struct QuestionnaireSkip: View {
  let title: Text
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size

  @Environment(\.questionnaire) private var questionnaire

  public init(_ title: LocalizedStringKey = "Skip", variant: VariantButtonStyle.Variant = .outline, size: VariantButtonStyle.Size = .default) {
    self.title = Text(title)
    self.variant = variant
    self.size = size
  }

  public var body: some View {
    QuestionnaireNavigationButton(title: title, variant: variant, size: size, visible: questionnaire?.activeItemRequired == false) {
      questionnaire?.skip()
    }
  }
}

public struct QuestionnaireNext: View {
  let title: Text
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size

  @Environment(\.questionnaire) private var questionnaire

  public init(_ title: LocalizedStringKey = "Next", variant: VariantButtonStyle.Variant = .default, size: VariantButtonStyle.Size = .default) {
    self.title = Text(title)
    self.variant = variant
    self.size = size
  }

  public var body: some View {
    let visible = (questionnaire?.total ?? 0) > 1 && questionnaire?.isLast == false
    QuestionnaireNavigationButton(title: title, variant: variant, size: size, visible: visible) {
      questionnaire?.goNext()
    }
  }
}

public struct QuestionnaireSubmit: View {
  let title: Text
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size

  @Environment(\.questionnaire) private var questionnaire

  public init(_ title: LocalizedStringKey = "Submit", variant: VariantButtonStyle.Variant = .default, size: VariantButtonStyle.Size = .default) {
    self.title = Text(title)
    self.variant = variant
    self.size = size
  }

  public var body: some View {
    let visible = (questionnaire?.total ?? 0) > 0 && questionnaire?.isLast == true
    QuestionnaireNavigationButton(title: title, variant: variant, size: size, visible: visible) {
      questionnaire?.submit()
    }
  }
}
```

```swift title="swift/Components/Button.swift"
import SwiftUI

public struct VariantButtonStyle: ButtonStyle {
  public enum Variant: CaseIterable, Sendable {
    case `default`, outline, secondary, tinted, ghost, plain, destructive, link
  }

  public enum Size: CaseIterable, Sendable {
    case `default`, xs, sm, lg, xl, icon, iconXs, iconSm, iconLg, iconXl

    var height: CGFloat {
      switch self {
      case .xs, .iconXs: 24
      case .sm, .iconSm: 32
      case .default, .icon: 36
      case .lg, .iconLg: 44
      case .xl, .iconXl: 56
      }
    }

    var horizontalPadding: CGFloat {
      switch self {
      case .xs: 11
      case .sm: 12
      case .default: 16
      case .lg: 22
      case .xl: 31
      case .icon, .iconXs, .iconSm, .iconLg, .iconXl: 0
      }
    }

    var spacing: CGFloat {
      switch self {
      case .xs, .sm, .iconXs, .iconSm: 4
      case .xl, .iconXl: 8
      default: 6
      }
    }

    var textStyle: TextStyle {
      switch self {
      case .xs, .iconXs: .xs2
      case .lg, .xl: .base
      default: .sm
      }
    }

    public var iconSize: CGFloat {
      switch self {
      case .xs, .iconXs: 12
      default: 16
      }
    }

    var blockRadius: CGFloat {
      switch self {
      case .xs, .iconXs: Radius.sm
      case .lg, .iconLg: Radius.lg
      case .xl, .iconXl: Radius.xl
      default: Radius.md
      }
    }

    var isIcon: Bool {
      switch self {
      case .icon, .iconXs, .iconSm, .iconLg, .iconXl: true
      default: false
      }
    }
  }

  let variant: Variant
  let size: Size
  let block: Bool
  var metrics: ButtonMetrics?

  public init(_ variant: Variant = .default, size: Size = .default, block: Bool = false) {
    self.variant = variant
    self.size = size
    self.block = block
  }

  init(_ variant: Variant, size: Size, metrics: ButtonMetrics) {
    self.variant = variant
    self.size = size
    self.block = false
    self.metrics = metrics
  }

  public func makeBody(configuration: Configuration) -> some View {
    StyledButton(configuration: configuration, variant: variant, size: size, block: block, metrics: metrics)
  }
}

struct ButtonMetrics: Sendable {
  var horizontalPadding: CGFloat
  var spacing: CGFloat
  var iconSize: CGFloat
  var textStyle: TextStyle
}

private struct StyledButton: View {
  let configuration: ButtonStyleConfiguration
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size
  let block: Bool
  let metrics: ButtonMetrics?

  @Environment(\.colorScheme) private var colorScheme
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.buttonGroup) private var group

  var body: some View {
    let joined = group != nil && variant != .ghost && variant != .plain
    let rounded = RoundedRectangle(
      cornerRadius: block ? size.blockRadius : Radius.full,
      style: .continuous
    )
    let shape = joined ? AnyShape(Rectangle()) : AnyShape(rounded)
    configuration.label
      .labelStyle(ButtonLabelStyle(spacing: metrics?.spacing ?? size.spacing, iconSize: metrics?.iconSize ?? size.iconSize))
    .font((metrics?.textStyle ?? size.textStyle).font())
    .tracking((metrics?.textStyle ?? size.textStyle).letterSpacing)
    .underline(variant == .link && pressed && isEnabled)
    .lineLimit(1)
    .foregroundStyle(foreground)
    .padding(.horizontal, metrics?.horizontalPadding ?? size.horizontalPadding)
    .frame(width: size.isIcon && !block ? size.height : nil, height: size.height)
    .frame(maxWidth: block || group == .vertical ? .infinity : nil)
    .background(background, in: shape)
    .overlay {
      if variant == .outline && !joined {
        rounded.strokeBorder(Color.separator)
      }
    }
    .contentShape(shape)
    .anchorPreference(key: ButtonGroupFramesKey.self, value: .bounds) { anchor in
      joined ? [ButtonGroupFrame(bounds: anchor, outlined: variant == .outline)] : []
    }
  }

  private var isDark: Bool { colorScheme == .dark }
  private var pressed: Bool { configuration.isPressed }

  private var foreground: Color {
    switch variant {
    case .default:
      .onAccent
    case .outline, .secondary, .ghost:
      isEnabled ? .label : .labelQuaternary
    case .tinted, .plain:
      isEnabled ? .link : .link.opacity(0.4)
    case .destructive:
      isEnabled ? .danger : .danger.opacity(0.4)
    case .link:
      isEnabled ? .link : .labelQuaternary
    }
  }

  private var background: Color {
    switch variant {
    case .default:
      !isEnabled ? .accentDisabled : pressed ? .accentPressed : .accent
    case .outline:
      isEnabled && pressed ? .itemPressed : isDark ? .clear : .surface
    case .secondary:
      !isEnabled ? .controlDisabled : pressed ? .controlPressed : .control
    case .tinted:
      isEnabled && pressed ? .accentSurfacePressed : .accentSurface
    case .ghost:
      isEnabled && pressed ? .itemPressed : .clear
    case .plain:
      isEnabled && pressed ? .itemPressed : .clear
    case .destructive:
      isEnabled && pressed ? .dangerSurfacePressed : .dangerSurface
    case .link:
      .clear
    }
  }
}

struct ButtonLabelStyle: LabelStyle {
  let spacing: CGFloat
  let iconSize: CGFloat

  func makeBody(configuration: Configuration) -> some View {
    HStack(spacing: spacing) {
      configuration.icon
        .frame(width: iconSize, height: iconSize)
      configuration.title
    }
  }
}

extension ButtonStyle where Self == VariantButtonStyle {
  public static func variant(
    _ variant: VariantButtonStyle.Variant = .default,
    size: VariantButtonStyle.Size = .default,
    block: Bool = false
  ) -> VariantButtonStyle {
    VariantButtonStyle(variant, size: size, block: block)
  }
}
```

```swift title="swift/Components/ButtonGroup.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry var buttonGroup: Axis? = nil
  @Entry var buttonGroupSize: CGSize = .zero
}

enum ButtonGroupSpace: Hashable {
  case group
}

struct ButtonGroupFrame {
  let bounds: Anchor<CGRect>
  let outlined: Bool
}

struct ButtonGroupFramesKey: PreferenceKey {
  static var defaultValue: [ButtonGroupFrame] { [] }

  static func reduce(value: inout [ButtonGroupFrame], nextValue: () -> [ButtonGroupFrame]) {
    value.append(contentsOf: nextValue())
  }
}

struct ButtonGroupNestedKey: PreferenceKey {
  static var defaultValue: Bool { false }

  static func reduce(value: inout Bool, nextValue: () -> Bool) {
    value = value || nextValue()
  }
}

public struct ButtonGroup<Content: View>: View {
  let orientation: Axis
  let content: Content

  @State private var nested = false
  @State private var size: CGSize = .zero

  public init(orientation: Axis = .horizontal, @ViewBuilder content: () -> Content) {
    self.orientation = orientation
    self.content = content()
  }

  public var body: some View {
    let shape = orientation == .horizontal
      ? AnyShape(Capsule())
      : AnyShape(RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
    stack
      .coordinateSpace(.named(ButtonGroupSpace.group))
      .onGeometryChange(for: CGSize.self) { $0.size } action: { size = $0 }
      .environment(\.buttonGroup, nested ? nil : orientation)
      .environment(\.buttonGroupSize, size)
      .onPreferenceChange(ButtonGroupNestedKey.self) { nested = $0 }
      .modifier(ButtonGroupClip(shape: nested ? nil : shape))
      .overlayPreferenceValue(ButtonGroupFramesKey.self) { frames in
        if !nested {
          GeometryReader { proxy in
            outline(frames.map { (proxy[$0.bounds], $0.outlined) }, shape: shape)
          }
        }
      }
      .transformPreference(ButtonGroupFramesKey.self) { $0 = [] }
      .transformPreference(ButtonGroupNestedKey.self) { $0 = true }
      .fixedSize(horizontal: orientation == .vertical, vertical: orientation == .horizontal)
      .accessibilityElement(children: .contain)
  }

  @ViewBuilder private var stack: some View {
    switch orientation {
    case .horizontal:
      HStack(spacing: nested ? 8 : 0) { content }
    case .vertical:
      VStack(spacing: nested ? 8 : 0) { content }
    }
  }

  @ViewBuilder private func outline(_ frames: [(CGRect, Bool)], shape: AnyShape) -> some View {
    if frames.contains(where: \.1) {
      ZStack(alignment: .topLeading) {
        shape
          .stroke(Color.separator, lineWidth: 1)
          .padding(0.5)
          .mask {
            Path { path in
              for (rect, outlined) in frames where outlined {
                path.addRect(rect)
              }
            }
          }
        ForEach(Array(frames.dropLast().enumerated()), id: \.offset) { _, frame in
          if frame.1 {
            divider(frame.0)
          }
        }
      }
      .clipShape(shape)
      .allowsHitTesting(false)
    }
  }

  private func divider(_ rect: CGRect) -> some View {
    let horizontal = orientation == .horizontal
    return Rectangle()
      .fill(Color.separator)
      .frame(width: horizontal ? 1 : rect.width, height: horizontal ? rect.height : 1)
      .position(
        x: horizontal ? rect.maxX - 0.5 : rect.midX,
        y: horizontal ? rect.midY : rect.maxY - 0.5
      )
  }
}

struct ButtonGroupItem<Content: View>: View {
  let radius: CGFloat
  let content: (UnevenRoundedRectangle) -> Content

  @State private var frame: CGRect = .zero
  @Environment(\.buttonGroup) private var group
  @Environment(\.buttonGroupSize) private var groupSize

  init(radius: CGFloat, @ViewBuilder content: @escaping (UnevenRoundedRectangle) -> Content) {
    self.radius = radius
    self.content = content
  }

  var body: some View {
    if let group {
      content(shape(group))
        .onGeometryChange(for: CGRect.self) { $0.frame(in: .named(ButtonGroupSpace.group)) } action: { frame = $0 }
    } else {
      content(UnevenRoundedRectangle(cornerRadii: RectangleCornerRadii(
        topLeading: radius,
        bottomLeading: radius,
        bottomTrailing: radius,
        topTrailing: radius
      ), style: .continuous))
    }
  }

  private func shape(_ group: Axis) -> UnevenRoundedRectangle {
    let horizontal = group == .horizontal
    let first = horizontal ? frame.minX <= 0.5 : frame.minY <= 0.5
    let last = horizontal
      ? frame.maxX >= groupSize.width - 0.5
      : frame.maxY >= groupSize.height - 0.5
    let round = horizontal ? frame.height / 2 : Radius.xl2
    let start: CGFloat = first ? round : 0
    let end: CGFloat = last ? round : 0
    let radii = horizontal
      ? RectangleCornerRadii(topLeading: start, bottomLeading: start, bottomTrailing: end, topTrailing: end)
      : RectangleCornerRadii(topLeading: start, bottomLeading: end, bottomTrailing: end, topTrailing: start)
    return UnevenRoundedRectangle(cornerRadii: radii, style: .continuous)
  }
}

private struct ButtonGroupClip: ViewModifier {
  let shape: AnyShape?

  func body(content: Content) -> some View {
    if let shape {
      content.clipShape(shape)
    } else {
      content
    }
  }
}

public struct ButtonGroupText<Content: View>: View {
  let content: Content

  @Environment(\.buttonGroup) private var group

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    let shape = group == nil ? AnyShape(Capsule()) : AnyShape(Rectangle())
    HStack(spacing: 8) {
      content
    }
    .labelStyle(ButtonLabelStyle(spacing: 8, iconSize: 16))
    .scaledFont(.sm)
    .lineLimit(1)
    .foregroundStyle(Color.label)
    .padding(.horizontal, 10)
    .frame(minHeight: 36)
    .frame(maxWidth: group == .vertical ? .infinity : nil, maxHeight: group == .horizontal ? .infinity : nil)
    .background(Color.control, in: shape)
    .anchorPreference(key: ButtonGroupFramesKey.self, value: .bounds) { anchor in
      group == nil ? [] : [ButtonGroupFrame(bounds: anchor, outlined: false)]
    }
  }
}

extension ButtonGroupText where Content == Text {
  public init(_ title: LocalizedStringKey) {
    self.init { Text(title) }
  }

  public init(verbatim title: String) {
    self.init { Text(verbatim: title) }
  }
}

public struct ButtonGroupSeparator: View {
  let orientation: Axis

  public init(_ orientation: Axis = .vertical) {
    self.orientation = orientation
  }

  public var body: some View {
    let vertical = orientation == .vertical
    Rectangle()
      .fill(Color.label.opacity(0.2))
      .frame(width: vertical ? 1 : nil, height: vertical ? nil : 1)
      .padding(vertical ? .vertical : .horizontal, 9)
      .frame(maxWidth: vertical ? nil : .infinity, maxHeight: vertical ? .infinity : nil)
      .padding(vertical ? .trailing : .bottom, -1)
      .zIndex(1)
      .accessibilityHidden(true)
  }
}
```

```swift title="swift/Components/Checkbox.swift"
import PhosphorSwift
import SwiftUI

extension Shadow {
  static let control = Shadow(color: .black.opacity(0.08), radius: 0.5, y: 0.5)
  static let thumb = Shadow(color: .black.opacity(0.12), radius: 1.5, y: 1)
}

struct SelectionIndicator<Mark: View>: View {
  let checked: Bool
  let pressed: Bool
  let cornerRadius: CGFloat
  let mark: Mark

  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme

  init(checked: Bool, pressed: Bool, cornerRadius: CGFloat, @ViewBuilder mark: () -> Mark) {
    self.checked = checked
    self.pressed = pressed
    self.cornerRadius = cornerRadius
    self.mark = mark()
  }

  var body: some View {
    let shape = RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
    ZStack {
      shape.fill(fill)
      shape.strokeBorder(border, lineWidth: 1)
      if checked {
        mark
      }
    }
    .frame(width: 16, height: 16)
    .shadow(raised ? .control : Shadow(color: .clear, radius: 0))
  }

  private var isDark: Bool { colorScheme == .dark }

  private var raised: Bool { !checked && isEnabled && !isDark }

  private var fill: Color {
    if checked {
      return !isEnabled ? .accentDisabled : pressed ? .accentPressed : .accent
    }
    if !isEnabled { return .controlDisabled }
    if isDark { return pressed ? .labelTertiary.opacity(0.6) : .labelQuaternary }
    return pressed ? .control : .surface
  }

  private var border: Color {
    if checked {
      return !isEnabled ? .clear : pressed ? .accentPressed : .accent
    }
    if !isEnabled { return isDark ? .clear : .label.opacity(0.1) }
    if invalid { return .danger }
    return isDark ? .clear : .label.opacity(0.25)
  }
}

struct PressReader<Content: View>: ButtonStyle {
  let content: (Bool) -> Content

  init(@ViewBuilder content: @escaping (Bool) -> Content) {
    self.content = content
  }

  func makeBody(configuration: Configuration) -> some View {
    content(configuration.isPressed)
  }
}

public struct CheckboxStyle: ToggleStyle {
  public init() {}

  public func makeBody(configuration: Configuration) -> some View {
    HapticButton(style: PressReader { pressed in
      HStack(spacing: 12) {
        SelectionIndicator(
          checked: configuration.isOn || configuration.isMixed,
          pressed: pressed,
          cornerRadius: 4
        ) {
          (configuration.isMixed ? Ph.minus.regular : Ph.check.regular)
            .frame(width: 14, height: 14)
            .foregroundStyle(Color.onAccent)
        }
        configuration.label
      }
      .contentShape(Rectangle().inset(by: -8))
    }) {
      configuration.isOn.toggle()
      return true
    }
    .accessibilityElement(children: .combine)
    .accessibilityRemoveTraits(.isButton)
    .accessibilityAddTraits(.isToggle)
    .accessibilityValue(
      configuration.isMixed
        ? Text("Mixed")
        : configuration.isOn ? Text("Checked") : Text("Unchecked")
    )
  }
}

extension ToggleStyle where Self == CheckboxStyle {
  public static var checkbox: CheckboxStyle { CheckboxStyle() }
}
```

```swift title="swift/Components/Field.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry public var isInvalid = false
  @Entry var fieldInset = false
  @Entry var fieldGroupInset = false
  @Entry var fieldSetInset = false
}

extension View {
  public func invalid(_ isInvalid: Bool = true) -> some View {
    environment(\.isInvalid, isInvalid)
  }
}

public enum FieldOrientation: CaseIterable, Sendable {
  case vertical, horizontal
}

public struct Field<Content: View>: View {
  let orientation: FieldOrientation
  let invalid: Bool?
  let content: Content

  @Environment(\.fieldGroupInset) private var inset
  @Environment(\.isInvalid) private var inheritedInvalid

  public init(
    orientation: FieldOrientation = .vertical,
    invalid: Bool? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.orientation = orientation
    self.invalid = invalid
    self.content = content()
  }

  public var body: some View {
    Group {
      switch orientation {
      case .vertical:
        VStack(alignment: .leading, spacing: 12) { content }
      case .horizontal:
        HStack(alignment: .center, spacing: 12) { content }
      }
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .padding(.horizontal, inset ? 16 : 0)
    .padding(.vertical, inset ? 6 : 0)
    .frame(minHeight: inset ? 44 : nil)
    .overlay(alignment: .top) {
      if inset {
        Color.separator
          .frame(height: 1)
          .padding(.leading, 16)
          .offset(y: -1)
      }
    }
    .environment(\.fieldInset, inset)
    .environment(\.fieldGroupInset, false)
    .environment(\.isInvalid, invalid ?? inheritedInvalid)
  }
}

public struct FieldContent<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 4) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
  }
}

public struct FieldTitle: View {
  let text: Text

  @Environment(\.isEnabled) private var isEnabled

  public init(_ title: LocalizedStringKey) {
    text = Text(title)
  }

  public init<S: StringProtocol>(_ title: S) {
    text = Text(title)
  }

  public var body: some View {
    text
      .scaledTextStyle(.base, weight: .semibold)
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
  }
}

public struct FieldDescription: View {
  let text: Text

  @Environment(\.fieldSetInset) private var inset

  public init(_ description: LocalizedStringKey) {
    text = Text(description)
  }

  public init<S: StringProtocol>(_ description: S) {
    text = Text(description)
  }

  public var body: some View {
    text
      .scaledTextStyle(inset ? .xs : .sm)
      .foregroundStyle(Color.labelSecondary)
      .multilineTextAlignment(.leading)
      .fixedSize(horizontal: false, vertical: true)
      .padding(.leading, inset ? 16 : 0)
  }
}

public struct FieldError: View {
  let messages: [String]
  let text: Text?

  public init(_ message: LocalizedStringKey) {
    messages = []
    text = Text(message)
  }

  public init(errors: [String?]) {
    var seen = Set<String>()
    messages = errors.compactMap { $0 }.filter { !$0.isEmpty && seen.insert($0).inserted }
    text = nil
  }

  public var body: some View {
    if let content {
      content
        .scaledTextStyle(.sm)
        .foregroundStyle(Color.danger)
        .multilineTextAlignment(.leading)
        .fixedSize(horizontal: false, vertical: true)
    }
  }

  private var content: Text? {
    if let text { return text }
    switch messages.count {
    case 0: return nil
    case 1: return Text(verbatim: messages[0])
    default: return Text(verbatim: messages.map { "\u{2022} \($0)" }.joined(separator: "\n"))
    }
  }
}

public enum FieldGroupVariant: CaseIterable, Sendable {
  case `default`, inset
}

public struct FieldGroup<Content: View>: View {
  let variant: FieldGroupVariant
  let content: Content

  public init(_ variant: FieldGroupVariant = .default, @ViewBuilder content: () -> Content) {
    self.variant = variant
    self.content = content()
  }

  public var body: some View {
    styled
      .environment(\.fieldGroupInset, variant == .inset)
      .environment(\.fieldSetInset, false)
      .transformPreference(FieldSetInsetKey.self) { $0 = variant == .inset }
  }

  @ViewBuilder private var styled: some View {
    let stack = VStack(alignment: .leading, spacing: variant == .inset ? 0 : 28) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    if variant == .inset {
      let shape = RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous)
      stack
        .background(Color.surfaceSecondary, in: shape)
        .clipShape(shape)
    } else {
      stack
    }
  }
}

struct FieldSetInsetKey: PreferenceKey {
  static let defaultValue = false

  static func reduce(value: inout Bool, nextValue: () -> Bool) {
    value = value || nextValue()
  }
}

public struct FieldSet<Content: View>: View {
  let content: Content

  @State private var inset = false

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: inset ? 8 : 24) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .environment(\.fieldSetInset, inset)
    .onPreferenceChange(FieldSetInsetKey.self) { inset = $0 }
    .transformPreference(FieldSetInsetKey.self) { $0 = false }
    .accessibilityElement(children: .contain)
  }
}

public struct FieldLegend: View {
  public enum Variant: CaseIterable, Sendable {
    case legend, label
  }

  let text: Text
  let variant: Variant

  @Environment(\.fieldSetInset) private var inset
  @Environment(\.isEnabled) private var isEnabled

  public init(_ title: LocalizedStringKey, variant: Variant = .legend) {
    text = Text(title)
    self.variant = variant
  }

  public init<S: StringProtocol>(_ title: S, variant: Variant = .legend) {
    text = Text(title)
    self.variant = variant
  }

  public var body: some View {
    Group {
      if inset {
        text
          .textCase(.uppercase)
          .scaledTextStyle(.xs)
          .foregroundStyle(isEnabled ? Color.labelSecondary : .labelQuaternary)
          .padding(.leading, 16)
      } else {
        text
          .scaledTextStyle(.base, weight: .semibold)
          .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
          .padding(.bottom, 12)
      }
    }
    .accessibilityAddTraits(variant == .legend ? .isHeader : [])
  }
}

public struct FieldSeparator<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    ZStack {
      Separator()
      content
        .scaledTextStyle(.sm)
        .foregroundStyle(Color.labelSecondary)
        .padding(.horizontal, 8)
        .background(Color.surface)
    }
    .frame(minHeight: 20)
    .padding(.vertical, -8)
  }
}

extension FieldSeparator where Content == EmptyView {
  public init() {
    self.init { EmptyView() }
  }
}

extension FieldSeparator where Content == Text {
  public init(_ title: LocalizedStringKey) {
    self.init { Text(title) }
  }
}
```

```swift title="swift/Components/Haptics.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry public var hapticsEnabled = true
}

extension View {
  public func haptics(_ enabled: Bool) -> some View {
    environment(\.hapticsEnabled, enabled)
  }

  func hapticFeedback<Trigger: Equatable>(_ feedback: SensoryFeedback, trigger: Trigger) -> some View {
    modifier(HapticFeedbackModifier(feedback: feedback, trigger: trigger) { _, _ in true })
  }

  func hapticFeedback<Trigger: Equatable>(
    _ feedback: SensoryFeedback,
    trigger: Trigger,
    condition: @escaping (Trigger, Trigger) -> Bool
  ) -> some View {
    modifier(HapticFeedbackModifier(feedback: feedback, trigger: trigger, condition: condition))
  }
}

private struct HapticFeedbackModifier<Trigger: Equatable>: ViewModifier {
  let feedback: SensoryFeedback
  let trigger: Trigger
  let condition: (Trigger, Trigger) -> Bool

  @Environment(\.hapticsEnabled) private var enabled

  func body(content: Content) -> some View {
    let enabled = enabled
    let condition = condition
    content.sensoryFeedback(feedback, trigger: trigger) { old, new in
      enabled && condition(old, new)
    }
  }
}

enum HapticMoments {
  static func step(_ value: Double, bounds: ClosedRange<Double>, step: Double?) -> Int? {
    guard let step, step > 0 else { return nil }
    return Int(((value - bounds.lowerBound) / step).rounded())
  }

  static func lifted<Value: Equatable>(_ old: Value?, _ new: Value?) -> Bool {
    new != nil && old != new
  }

  static func crossed<Value: Equatable>(_ old: Value?, _ new: Value?) -> Bool {
    old == nil && new != nil
  }

  static func moved(_ old: Int?, _ new: Int?) -> Bool {
    guard let old, let new else { return false }
    return old != new
  }
}

struct HapticButton<Style: ButtonStyle>: View {
  let feedback: SensoryFeedback
  let action: () -> Bool
  let style: Style

  @State private var count = 0

  init(_ feedback: SensoryFeedback = .selection, style: Style, action: @escaping () -> Bool) {
    self.feedback = feedback
    self.style = style
    self.action = action
  }

  var body: some View {
    Button {
      if action() { count += 1 }
    } label: {
      EmptyView()
    }
    .buttonStyle(style)
    .hapticFeedback(feedback, trigger: count)
  }
}
```

```swift title="swift/Components/Separator.swift"
import SwiftUI

public struct Separator: View {
  let orientation: Axis

  public init(_ orientation: Axis = .horizontal) {
    self.orientation = orientation
  }

  public var body: some View {
    Rectangle()
      .fill(Color.separator)
      .frame(width: orientation == .vertical ? 1 : nil, height: orientation == .horizontal ? 1 : nil)
      .frame(maxWidth: orientation == .horizontal ? .infinity : nil, maxHeight: orientation == .vertical ? .infinity : nil)
      .accessibilityHidden(true)
  }
}
```

```swift title="swift/Components/TextVariant.swift"
import SwiftUI

public enum TextVariant: CaseIterable, Sendable {
  case `default`, h1, h2, h3, h4, p, blockquote, code, lead, large, small, muted

  var style: TextStyle {
    switch self {
    case .h1: .xl3
    case .h2: .xl2
    case .h3: .xl
    case .h4, .lead, .large: .lg
    case .code, .small, .muted: .sm
    default: .base
    }
  }

  var weight: Font.Weight {
    switch self {
    case .h1, .h2: .bold
    case .h3, .h4, .large, .code: .semibold
    case .small: .medium
    default: .regular
    }
  }

  var color: Color {
    switch self {
    case .lead, .muted: .labelSecondary
    default: .label
    }
  }

  var isHeading: Bool {
    switch self {
    case .h1, .h2, .h3, .h4: true
    default: false
    }
  }
}

private struct TextVariantModifier: ViewModifier {
  let variant: TextVariant

  func body(content: Content) -> some View {
    switch variant {
    case .blockquote:
      styled(content)
        .italic()
        .padding(.leading, 12)
        .overlay(alignment: .leading) {
          Rectangle().fill(Color.separator).frame(width: 2)
        }
        .padding(.top, 16)
    case .code:
      styled(content)
        .monospaced()
        .padding(.horizontal, 4)
        .padding(.vertical, 2)
        .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.sm, style: .continuous))
    case .p:
      styled(content).padding(.top, 12)
    default:
      styled(content)
    }
  }

  private func styled(_ content: Content) -> some View {
    content
      .scaledTextStyle(variant.style, weight: variant.weight)
      .foregroundStyle(variant.color)
      .accessibilityAddTraits(variant.isHeading ? .isHeader : [])
  }
}

extension View {
  public func textVariant(_ variant: TextVariant) -> some View {
    modifier(TextVariantModifier(variant: variant))
  }
}

private struct ScaledTextStyleModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  @ScaledMetric(relativeTo: .body) private var scale: CGFloat = 1

  func body(content: Content) -> some View {
    let size = style.size * scale
    let lineSpacing = max(0, style.lineHeight * scale - UIFont.systemFont(ofSize: size).lineHeight)
    content
      .font(.system(size: size, weight: weight))
      .tracking(style.letterSpacing)
      .lineSpacing(lineSpacing)
      .padding(.vertical, lineSpacing / 2)
  }
}

extension View {
  func scaledTextStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(ScaledTextStyleModifier(style: style, weight: weight))
  }

  func scaledFont(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(ScaledFontModifier(style: style, weight: weight))
  }
}

private struct ScaledFontModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  @ScaledMetric(relativeTo: .body) private var scale: CGFloat = 1

  func body(content: Content) -> some View {
    content
      .font(.system(size: style.size * scale, weight: weight))
      .tracking(style.letterSpacing)
  }
}
```

5. Add the files to your app target.

**Jetpack Compose**

1. Set `minSdk` to 24 or higher and add the dependencies:

```kotlin title="build.gradle.kts"
implementation(platform("androidx.compose:compose-bom:2026.09.00"))
implementation("androidx.compose.foundation:foundation")
implementation("androidx.compose.ui:ui")
implementation("com.adamglin:phosphor-icon-android:1.0.0")
```

2. Copy the theme files every view uses:

```kt title="kotlin/theme/Theme.kt"
package com.esuiss.ui.theme

import androidx.compose.foundation.isSystemInDarkTheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.dropShadow
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.shadow.Shadow as DropShadow
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.style.LineHeightStyle
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.DpOffset
import androidx.compose.ui.unit.em
import androidx.compose.ui.unit.sp

internal fun textStyle(size: Double, lineHeight: Double, letterSpacing: Double) = TextStyle(
    fontSize = size.sp,
    lineHeight = lineHeight.sp,
    letterSpacing = letterSpacing.em,
    lineHeightStyle = LineHeightStyle(
        alignment = LineHeightStyle.Alignment.Center,
        trim = LineHeightStyle.Trim.None,
    ),
)

@Immutable
data class Shadow(
    val offsetX: Dp,
    val offsetY: Dp,
    val blur: Dp,
    val color: Color,
)

fun Modifier.shadow(shadow: Shadow, shape: Shape): Modifier = dropShadow(
    shape,
    DropShadow(
        radius = shadow.blur,
        color = shadow.color,
        offset = DpOffset(shadow.offsetX, shadow.offsetY),
    ),
)

val LocalColors = staticCompositionLocalOf { LightColors }

object EsuissTheme {
    val colors: Colors
        @Composable get() = LocalColors.current

    val typography: Typography
        get() = Typography

    val radius: Radius
        get() = Radius

    val shadows: Shadows
        get() = Shadows
}

@Composable
fun EsuissTheme(
    darkTheme: Boolean = isSystemInDarkTheme(),
    content: @Composable () -> Unit,
) {
    CompositionLocalProvider(
        LocalColors provides if (darkTheme) DarkColors else LightColors,
        content = content,
    )
}
```

```kt title="kotlin/theme/Tokens.kt"
package com.esuiss.ui.theme

import androidx.compose.runtime.Immutable
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp

@Immutable
data class Colors(
    val surface: Color,
    val surfaceSecondary: Color,
    val surfaceTertiary: Color,
    val surfaceRaised: Color,
    val label: Color,
    val labelSecondary: Color,
    val labelTertiary: Color,
    val labelQuaternary: Color,
    val control: Color,
    val controlPressed: Color,
    val controlSelected: Color,
    val controlDisabled: Color,
    val onControlSelected: Color,
    val itemPressed: Color,
    val itemSelected: Color,
    val separator: Color,
    val separatorStrong: Color,
    val accent: Color,
    val accentPressed: Color,
    val accentSelected: Color,
    val accentDisabled: Color,
    val onAccent: Color,
    val accentSurface: Color,
    val accentSurfacePressed: Color,
    val link: Color,
    val focus: Color,
    val scrim: Color,
    val media: Color,
    val onMedia: Color,
    val danger: Color,
    val dangerSurface: Color,
    val dangerSurfacePressed: Color,
    val success: Color,
    val successSurface: Color,
    val warning: Color,
    val warningSurface: Color,
    val blue: Color,
    val green: Color,
    val orange: Color,
    val red: Color,
    val yellow: Color,
    val purple: Color,
    val pink: Color,
    val indigo: Color,
    val teal: Color,
    val mint: Color,
    val cyan: Color,
    val brown: Color,
    val gray: Color,
    val isDark: Boolean,
)

val LightColors = Colors(
    surface = Color(0xFFFFFFFF),
    surfaceSecondary = Color(0xFFF5F5F7),
    surfaceTertiary = Color(0xFFE8E8ED),
    surfaceRaised = Color(0xFFFFFFFF),
    label = Color(0xFF1D1D1F),
    labelSecondary = Color(0xFF6E6E73),
    labelTertiary = Color(0xFF86868B),
    labelQuaternary = Color(0xFFD2D2D7),
    control = Color(0xFF000000).copy(alpha = 0.04f),
    controlPressed = Color(0xFF000000).copy(alpha = 0.12f),
    controlSelected = Color(0xFF1D1D1F),
    controlDisabled = Color(0xFF000000).copy(alpha = 0.03f),
    onControlSelected = Color(0xFFFFFFFF),
    itemPressed = Color(0xFF000000).copy(alpha = 0.08f),
    itemSelected = Color(0xFF000000).copy(alpha = 0.06f),
    separator = Color(0xFFD2D2D7),
    separatorStrong = Color(0xFF86868B),
    accent = Color(0xFF0071E3),
    accentPressed = Color(0xFF005BB8),
    accentSelected = Color(0xFF0071E3),
    accentDisabled = Color(0xFF0071E3).copy(alpha = 0.4f),
    onAccent = Color(0xFFFFFFFF),
    accentSurface = Color(0xFF0071E3).copy(alpha = 0.09f),
    accentSurfacePressed = Color(0xFF0071E3).copy(alpha = 0.18f),
    link = Color(0xFF0066CC),
    focus = Color(0xFF0071E3),
    scrim = Color(0xFF000000).copy(alpha = 0.48f),
    media = Color(0xFF000000),
    onMedia = Color(0xFFFFFFFF),
    danger = Color(0xFFD0000A),
    dangerSurface = Color(0xFFD70015).copy(alpha = 0.08f),
    dangerSurfacePressed = Color(0xFFD70015).copy(alpha = 0.16f),
    success = Color(0xFF008009),
    successSurface = Color(0xFFEFFAF1),
    warning = Color(0xFFB64400),
    warningSurface = Color(0xFFFFF5EA),
    blue = Color(0xFF007AFF),
    green = Color(0xFF34C759),
    orange = Color(0xFFFF9500),
    red = Color(0xFFFF3B30),
    yellow = Color(0xFFFFCC00),
    purple = Color(0xFFAF52DE),
    pink = Color(0xFFFF2D55),
    indigo = Color(0xFF5856D6),
    teal = Color(0xFF30B0C7),
    mint = Color(0xFF00C7BE),
    cyan = Color(0xFF32ADE6),
    brown = Color(0xFFA2845E),
    gray = Color(0xFF8E8E93),
    isDark = false,
)

val DarkColors = Colors(
    surface = Color(0xFF000000),
    surfaceSecondary = Color(0xFF161617),
    surfaceTertiary = Color(0xFF2C2C2E),
    surfaceRaised = Color(0xFF1D1D1F),
    label = Color(0xFFF5F5F7),
    labelSecondary = Color(0xFFA1A1A6),
    labelTertiary = Color(0xFF86868B),
    labelQuaternary = Color(0xFF424245),
    control = Color(0xFFFFFFFF).copy(alpha = 0.1f),
    controlPressed = Color(0xFFFFFFFF).copy(alpha = 0.22f),
    controlSelected = Color(0xFFF5F5F7),
    controlDisabled = Color(0xFFFFFFFF).copy(alpha = 0.05f),
    onControlSelected = Color(0xFF000000),
    itemPressed = Color(0xFFFFFFFF).copy(alpha = 0.12f),
    itemSelected = Color(0xFFFFFFFF).copy(alpha = 0.1f),
    separator = Color(0xFF424245),
    separatorStrong = Color(0xFF6E6E73),
    accent = Color(0xFF0071E3),
    accentPressed = Color(0xFF004D9E),
    accentSelected = Color(0xFF0071E3),
    accentDisabled = Color(0xFF0071E3).copy(alpha = 0.4f),
    onAccent = Color(0xFFFFFFFF),
    accentSurface = Color(0xFF0071E3).copy(alpha = 0.18f),
    accentSurfacePressed = Color(0xFF0071E3).copy(alpha = 0.3f),
    link = Color(0xFF2997FF),
    focus = Color(0xFF0071E3),
    scrim = Color(0xFF000000).copy(alpha = 0.48f),
    media = Color(0xFF000000),
    onMedia = Color(0xFFFFFFFF),
    danger = Color(0xFFFF5447),
    dangerSurface = Color(0xFFFF453A).copy(alpha = 0.2f),
    dangerSurfacePressed = Color(0xFFFF453A).copy(alpha = 0.36f),
    success = Color(0xFF30D158),
    successSurface = Color(0xFF30D158).copy(alpha = 0.16f),
    warning = Color(0xFFFF9F0A),
    warningSurface = Color(0xFFFF9F0A).copy(alpha = 0.16f),
    blue = Color(0xFF0A84FF),
    green = Color(0xFF30D158),
    orange = Color(0xFFFF9F0A),
    red = Color(0xFFFF453A),
    yellow = Color(0xFFFFD60A),
    purple = Color(0xFFBF5AF2),
    pink = Color(0xFFFF375F),
    indigo = Color(0xFF5E5CE6),
    teal = Color(0xFF40C8E0),
    mint = Color(0xFF66D4CF),
    cyan = Color(0xFF64D2FF),
    brown = Color(0xFFAC8E68),
    gray = Color(0xFF8E8E93),
    isDark = true,
)

object Radius {
    val xs = 3.dp
    val sm = 5.dp
    val md = 8.dp
    val lg = 10.dp
    val xl = 12.dp
    val xl2 = 18.dp
    val xl3 = 28.dp
    val full = 9999.dp
}

object Typography {
    val xs3 = textStyle(11.0, 13.0, 0.006)
    val xs2 = textStyle(12.0, 16.0, 0.0)
    val xs = textStyle(13.0, 18.0, -0.006)
    val sm = textStyle(15.0, 20.0, -0.016)
    val md = textStyle(16.0, 21.0, -0.02)
    val base = textStyle(17.0, 22.0, -0.026)
    val lg = textStyle(20.0, 25.0, -0.023)
    val xl = textStyle(22.0, 28.0, -0.012)
    val xl2 = textStyle(28.0, 34.0, 0.014)
    val xl3 = textStyle(34.0, 41.0, 0.012)

    val all = listOf(xs3, xs2, xs, sm, md, base, lg, xl, xl2, xl3)
}

object Shadows {
    val md = Shadow(2.dp, 4.dp, 12.dp, Color.Black.copy(alpha = 0.08f))
    val lg = Shadow(0.dp, 4.dp, 24.dp, Color.Black.copy(alpha = 0.12f))
}
```

3. Copy the source and every file it uses:

```kt title="kotlin/components/Questionnaire.kt"
package com.esuiss.ui.components

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.EnterTransition
import androidx.compose.animation.ExitTransition
import androidx.compose.animation.core.tween
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.slideInHorizontally
import androidx.compose.animation.slideOutHorizontally
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.selection.selectable
import androidx.compose.foundation.selection.selectableGroup
import androidx.compose.foundation.selection.toggleable
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateListOf
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.setValue
import androidx.compose.runtime.snapshotFlow
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.clipToBounds
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.layout
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.ProgressBarRangeInfo
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.error
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.progressBarRangeInfo
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.stateDescription
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.constrainHeight
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Bold
import com.adamglin.phosphoricons.bold.Check
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class QuestionnaireItemStatus { Unanswered, Answered, Skipped }

@Immutable
class QuestionnaireItemDefinition(
    val name: String,
    val required: Boolean = false,
    val disabled: Boolean = false,
)

@Stable
internal class QuestionnaireItemRecord(val name: String) {
    var required by mutableStateOf(false)
    var disabled by mutableStateOf(false)
    var multiple by mutableStateOf(false)
    var invalidProp by mutableStateOf(false)
    var skipped by mutableStateOf(false)
    var attempted by mutableStateOf(false)
    var input by mutableStateOf("")
    var defaultInput = ""
    val selected = mutableStateListOf<String>()
    val defaults = mutableListOf<String>()
    val initialized = mutableSetOf<String>()
    var onStatusChange: ((QuestionnaireItemStatus) -> Unit)? = null
    private var reported = QuestionnaireItemStatus.Unanswered

    val answered: Boolean
        get() = selected.isNotEmpty() || input.isNotBlank()

    val status: QuestionnaireItemStatus
        get() = when {
            skipped -> QuestionnaireItemStatus.Skipped
            answered -> QuestionnaireItemStatus.Answered
            else -> QuestionnaireItemStatus.Unanswered
        }

    val satisfied: Boolean
        get() = disabled || (skipped && !required) || (!invalidProp && status == QuestionnaireItemStatus.Answered)

    val invalid: Boolean
        get() = !disabled && !(skipped && !required) && (invalidProp || (attempted && !satisfied))

    fun select(value: String, on: Boolean) {
        skipped = false
        when {
            !on -> selected.remove(value)
            multiple -> if (value !in selected) selected.add(value)
            else -> if (selected.size != 1 || selected[0] != value) {
                selected.clear()
                selected.add(value)
            }
        }
    }

    fun updateInput(text: String) {
        if (text.isNotBlank()) skipped = false
        input = text
    }

    fun skip() {
        if (required) return
        selected.clear()
        input = ""
        skipped = true
    }

    fun reset() {
        attempted = false
        skipped = false
        selected.clear()
        selected.addAll(if (multiple) defaults else defaults.take(1))
        input = defaultInput
    }

    fun report() {
        val current = status
        if (current == reported) return
        reported = current
        onStatusChange?.invoke(current)
    }
}

@Stable
class QuestionnaireState internal constructor(
    defaultItem: String?,
    private val definitions: List<QuestionnaireItemDefinition>?,
) {
    private val records = mutableStateMapOf<String, QuestionnaireItemRecord>()
    private val order = mutableStateListOf<String>()
    private var requested by mutableStateOf(defaultItem)
    internal var forward by mutableStateOf(true)
    internal var animated by mutableStateOf(false)
    internal var onItemChange: ((String) -> Unit)? = null
    internal var onSubmit: ((Map<String, List<String>>) -> Unit)? = null
    internal var onInvalid: (() -> Unit)? = null

    private val sequence: List<String>
        get() = definitions?.filter { !it.disabled }?.map { it.name }
            ?: order.filter { records[it]?.disabled != true }

    val item: String?
        get() {
            val names = sequence
            return requested?.takeIf { it in names } ?: names.firstOrNull()
        }

    private val index: Int
        get() = item?.let { sequence.indexOf(it) } ?: -1

    val total: Int
        get() = sequence.size

    val current: Int
        get() = index + 1

    val first: Boolean
        get() = total > 0 && index == 0

    val last: Boolean
        get() = total > 0 && index == total - 1

    val activeItemRequired: Boolean?
        get() {
            val name = item ?: return null
            return definitions?.firstOrNull { it.name == name }?.required ?: records[name]?.required ?: false
        }

    val activeItemStatus: QuestionnaireItemStatus?
        get() {
            val name = item ?: return null
            return records[name]?.status ?: QuestionnaireItemStatus.Unanswered
        }

    val values: Map<String, List<String>>
        get() = sequence.mapNotNull { name ->
            val record = records[name] ?: return@mapNotNull null
            if (record.skipped || !record.answered) return@mapNotNull null
            name to (record.selected.toList() + listOfNotNull(record.input.takeIf { it.isNotBlank() }))
        }.toMap()

    fun status(name: String): QuestionnaireItemStatus = records[name]?.status ?: QuestionnaireItemStatus.Unanswered

    internal fun record(name: String): QuestionnaireItemRecord = records.getOrPut(name) { QuestionnaireItemRecord(name) }

    internal fun register(name: String): () -> Unit {
        record(name)
        if (name !in order) order.add(name)
        return { order.remove(name) }
    }

    internal fun isActive(name: String) = item == name

    fun goTo(name: String) {
        val names = sequence
        val target = names.indexOf(name)
        if (target < 0 || name == item) return
        forward = target > index
        animated = true
        requested = name
        onItemChange?.invoke(name)
    }

    fun goPrevious() {
        val previous = sequence.getOrNull(index - 1) ?: return
        goTo(previous)
    }

    fun goNext() {
        val name = item ?: return
        val next = sequence.getOrNull(index + 1) ?: return
        if (!validate(name)) {
            onInvalid?.invoke()
            return
        }
        goTo(next)
    }

    fun skipCurrent() {
        val name = item ?: return
        if (activeItemRequired != false) return
        records[name]?.skip()
        val next = sequence.getOrNull(index + 1)
        if (next != null) goTo(next) else submit()
    }

    fun submit() {
        val invalid = sequence.firstOrNull { !validate(it) }
        if (invalid != null) {
            goTo(invalid)
            onInvalid?.invoke()
            return
        }
        onSubmit?.invoke(values)
    }

    fun reset() {
        records.values.forEach { it.reset() }
        val start = sequence.firstOrNull() ?: return
        if (start != item) goTo(start)
    }

    private fun validate(name: String): Boolean {
        val record = records[name] ?: return definitions?.firstOrNull { it.name == name }?.required != true
        record.attempted = true
        return record.satisfied
    }
}

@Composable
fun rememberQuestionnaireState(
    defaultItem: String? = null,
    items: List<QuestionnaireItemDefinition>? = null,
): QuestionnaireState = remember(items) { QuestionnaireState(defaultItem, items) }

private val LocalQuestionnaire = staticCompositionLocalOf<QuestionnaireState?> { null }

private val LocalQuestionnaireItem = staticCompositionLocalOf<QuestionnaireItemRecord?> { null }

@Composable
fun useQuestionnaire(): QuestionnaireState =
    checkNotNull(LocalQuestionnaire.current) { "Questionnaire parts must be used within a Questionnaire" }

@Composable
private fun questionnaireItem(): QuestionnaireItemRecord =
    checkNotNull(LocalQuestionnaireItem.current) { "Questionnaire item parts must be used within a QuestionnaireItem" }

private object QuestionnaireItemSlot

private object QuestionnairePreviousSlot

private fun Modifier.pullUp(amount: Dp): Modifier = layout { measurable, constraints ->
    val placeable = measurable.measure(constraints)
    val pull = amount.roundToPx()
    layout(placeable.width, (placeable.height - pull).coerceAtLeast(0)) { placeable.place(0, -pull) }
}

@Composable
fun Questionnaire(
    modifier: Modifier = Modifier,
    state: QuestionnaireState = rememberQuestionnaireState(),
    onItemChange: ((String) -> Unit)? = null,
    onSubmit: (Map<String, List<String>>) -> Unit = {},
    content: @Composable () -> Unit,
) {
    val haptics = rememberHaptics()
    val itemChange by rememberUpdatedState(onItemChange)
    val submit by rememberUpdatedState(onSubmit)
    SideEffect {
        state.onItemChange = { itemChange?.invoke(it) }
        state.onSubmit = { submit(it) }
        state.onInvalid = { haptics.perform(HapticFeedbackType.Reject) }
    }
    CompositionLocalProvider(LocalQuestionnaire provides state) {
        Layout(content = content, modifier = modifier.fillMaxWidth()) { measurables, constraints ->
            val loose = constraints.copy(minWidth = 0, minHeight = 0)
            val placeables = measurables.map { it.measure(loose) }
            val slots = measurables.map { it.layoutId == QuestionnaireItemSlot }
            val gap = 24.dp.roundToPx()
            val positions = IntArray(placeables.size)
            var y = 0
            var started = false
            var index = 0
            while (index < placeables.size) {
                var end = index + 1
                if (slots[index]) while (end < placeables.size && slots[end]) end++
                val height = (index until end).maxOf { placeables[it].height }
                if (height > 0 && started) y += gap
                for (cell in index until end) positions[cell] = y
                if (height > 0) {
                    y += height
                    started = true
                }
                index = end
            }
            val width = constraints.maxWidth.takeIf { it != Constraints.Infinity }
                ?: placeables.maxOfOrNull { it.width } ?: 0
            layout(width, constraints.constrainHeight(y)) {
                placeables.forEachIndexed { i, placeable -> placeable.place(0, positions[i]) }
            }
        }
    }
}

@Composable
fun QuestionnaireProgress(
    modifier: Modifier = Modifier,
    content: (@Composable (current: Int, total: Int) -> Unit)? = null,
) {
    val state = useQuestionnaire()
    val total = state.total
    val current = state.current
    val text = if (total > 0) "Question $current of $total" else ""
    Box(
        modifier = modifier
            .heightIn(min = 18.dp)
            .semantics(mergeDescendants = true) {
                contentDescription = "Questionnaire progress"
                liveRegion = LiveRegionMode.Polite
                if (total > 0) {
                    progressBarRangeInfo = ProgressBarRangeInfo(current.toFloat(), 1f..total.toFloat())
                    stateDescription = text
                }
            },
    ) {
        if (content != null) {
            CompositionLocalProvider(
                LocalContentStyle provides Typography.xs.copy(color = EsuissTheme.colors.labelSecondary),
                LocalContentColor provides EsuissTheme.colors.labelSecondary,
            ) {
                content(current, total)
            }
        } else {
            BasicText(text, style = Typography.xs.copy(color = EsuissTheme.colors.labelSecondary))
        }
    }
}

@Composable
fun QuestionnaireItem(
    name: String,
    modifier: Modifier = Modifier,
    required: Boolean = false,
    multiple: Boolean = false,
    enabled: Boolean = true,
    invalid: Boolean = false,
    onStatusChange: ((QuestionnaireItemStatus) -> Unit)? = null,
    content: @Composable ColumnScope.() -> Unit,
) {
    val state = useQuestionnaire()
    val record = remember(state, name) { state.record(name) }
    DisposableEffect(state, name) { onDispose(state.register(name)) }
    val wasMultiple = remember(record) { mutableStateOf(multiple) }
    SideEffect {
        record.required = required
        record.disabled = !enabled
        record.invalidProp = invalid
        record.onStatusChange = onStatusChange
        if (wasMultiple.value && !multiple && record.selected.size > 1) {
            val keep = record.selected.first()
            record.selected.clear()
            record.selected.add(keep)
        }
        wasMultiple.value = multiple
        record.multiple = multiple
    }
    LaunchedEffect(record) {
        snapshotFlow { record.status }.collect { record.report() }
    }
    val active = enabled && state.isActive(name)
    val reduced = formReducedMotion()
    val animate = state.animated && !reduced
    val enter = if (animate) {
        slideInHorizontally(tween(320, easing = FormEasing)) { if (state.forward) it else -it } +
            fadeIn(tween(320, easing = FormEasing))
    } else {
        EnterTransition.None
    }
    val exit = if (animate) {
        slideOutHorizontally(tween(320, easing = FormEasing)) { if (state.forward) -it else it } +
            fadeOut(tween(200, easing = FormEasing))
    } else {
        ExitTransition.None
    }
    Box(modifier = Modifier.layoutId(QuestionnaireItemSlot).fillMaxWidth().clipToBounds()) {
        AnimatedVisibility(visible = active, enter = enter, exit = exit) {
            CompositionLocalProvider(LocalQuestionnaireItem provides record) {
                Column(
                    modifier = modifier
                        .fillMaxWidth()
                        .semantics {
                            if (record.invalid) error(if (required) "Choose an answer to continue." else "Choose an answer or skip this question.")
                        },
                    verticalArrangement = Arrangement.spacedBy(20.dp),
                    content = content,
                )
            }
        }
    }
}

@Composable
fun QuestionnaireTitle(text: String, modifier: Modifier = Modifier) {
    questionnaireItem()
    BasicText(
        text,
        modifier = modifier.semantics { heading() },
        style = Typography.base.copy(color = EsuissTheme.colors.label, fontWeight = FontWeight.SemiBold),
    )
}

@Composable
fun QuestionnaireDescription(text: String, modifier: Modifier = Modifier) {
    BasicText(
        text,
        modifier = modifier.pullUp(16.dp),
        style = Typography.sm.copy(color = EsuissTheme.colors.labelSecondary),
    )
}

@Composable
fun QuestionnaireChoices(modifier: Modifier = Modifier, content: @Composable ColumnScope.() -> Unit) {
    val item = questionnaireItem()
    Column(
        modifier = modifier
            .fillMaxWidth()
            .then(if (item.multiple) Modifier else Modifier.selectableGroup()),
        verticalArrangement = Arrangement.spacedBy(12.dp),
        content = content,
    )
}

@Composable
fun QuestionnaireChoice(
    value: String,
    modifier: Modifier = Modifier,
    checked: Boolean? = null,
    onCheckedChange: ((Boolean) -> Unit)? = null,
    defaultChecked: Boolean = false,
    enabled: Boolean = true,
    content: @Composable ColumnScope.() -> Unit,
) {
    val item = questionnaireItem()
    val colors = EsuissTheme.colors
    val haptics = rememberHaptics()
    val source = remember { MutableInteractionSource() }
    val pressed by source.collectIsPressedAsState()
    SideEffect {
        if (value !in item.initialized) {
            item.initialized.add(value)
            if (defaultChecked) {
                item.defaults.add(value)
                if (checked == null && (item.multiple || item.selected.isEmpty())) item.selected.add(value)
            }
        }
    }
    LaunchedEffect(item, value, checked) {
        if (checked == null) return@LaunchedEffect
        if (checked) item.select(value, true) else item.selected.remove(value)
    }
    val active = enabled && !item.disabled
    val on = if (checked != null) checked && !item.skipped else value in item.selected
    val invalid = item.invalid
    val multiple = item.multiple
    val change: (Boolean) -> Unit = { next ->
        haptics.selection()
        if (checked == null) item.select(value, next) else item.skipped = false
        onCheckedChange?.invoke(next)
    }
    val shape = RoundedCornerShape(Radius.xl)
    val background = when {
        invalid -> colors.danger.copy(alpha = if (colors.isDark) 0.1f else 0.05f)
        pressed && active -> colors.itemPressed
        else -> Color.Transparent
    }
    val border = when {
        on -> colors.accent
        invalid -> colors.danger
        else -> colors.separator
    }
    val interaction = if (multiple) {
        Modifier.toggleable(on, source, null, active, Role.Checkbox) { change(it) }
    } else {
        Modifier.selectable(on, source, null, active, Role.RadioButton) { change(true) }
    }
    Row(
        modifier = modifier
            .fillMaxWidth()
            .heightIn(min = 44.dp)
            .clip(shape)
            .background(background, shape)
            .border(if (on) 2.dp else 1.dp, border, shape)
            .then(interaction)
            .padding(horizontal = 16.dp, vertical = 12.dp),
        horizontalArrangement = Arrangement.spacedBy(10.dp),
        verticalAlignment = Alignment.Top,
    ) {
        Box(
            modifier = Modifier
                .padding(top = 3.dp)
                .size(16.dp)
                .background(if (on) colors.accent else colors.labelQuaternary, if (multiple) RoundedCornerShape(Radius.xs) else CircleShape),
            contentAlignment = Alignment.Center,
        ) {
            if (on && multiple) {
                Icon(PhosphorIcons.Bold.Check, contentDescription = null, size = 12.dp, tint = colors.onAccent)
            } else if (on) {
                Box(Modifier.size(if (colors.isDark) 10.dp else 8.dp).background(colors.onAccent, CircleShape))
            }
        }
        val foreground = if (active) colors.label else colors.labelQuaternary
        CompositionLocalProvider(
            LocalContentStyle provides Typography.base.copy(color = foreground),
            LocalContentColor provides foreground,
            LocalQuestionnaireChoiceEnabled provides active,
        ) {
            Column(modifier = Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(4.dp), content = content)
        }
    }
}

private val LocalQuestionnaireChoiceEnabled = staticCompositionLocalOf { true }

@Composable
fun QuestionnaireChoice(
    text: String,
    value: String,
    modifier: Modifier = Modifier,
    checked: Boolean? = null,
    onCheckedChange: ((Boolean) -> Unit)? = null,
    defaultChecked: Boolean = false,
    enabled: Boolean = true,
) {
    QuestionnaireChoice(value, modifier, checked, onCheckedChange, defaultChecked, enabled) {
        BasicText(text, style = LocalContentStyle.current)
    }
}

@Composable
fun QuestionnaireChoiceDescription(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    BasicText(
        text,
        modifier = modifier,
        style = LocalContentStyle.current.copy(
            color = if (LocalQuestionnaireChoiceEnabled.current) colors.labelSecondary else colors.labelQuaternary,
        ),
    )
}

@Composable
fun QuestionnaireInput(
    modifier: Modifier = Modifier,
    value: String? = null,
    onValueChange: ((String) -> Unit)? = null,
    defaultValue: String = "",
    enabled: Boolean = true,
    placeholder: String? = null,
    keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
) {
    val item = questionnaireItem()
    val state = useQuestionnaire()
    SideEffect {
        if (InputMarker !in item.initialized) {
            item.initialized.add(InputMarker)
            item.defaultInput = defaultValue
            if (value == null) item.input = defaultValue
        }
    }
    LaunchedEffect(item, value) {
        if (value != null) item.updateInput(value)
    }
    Input(
        value = value ?: item.input,
        onValueChange = { next ->
            if (value == null) item.updateInput(next)
            onValueChange?.invoke(next)
        },
        modifier = modifier,
        enabled = enabled && !item.disabled,
        invalid = item.invalid,
        placeholder = placeholder,
        keyboardOptions = keyboardOptions,
        keyboardActions = KeyboardActions(onDone = {
            if (state.last) state.submit() else state.goNext()
        }),
    )
}

private const val InputMarker = "\u0000input"

@Composable
fun QuestionnaireError(text: String? = null, modifier: Modifier = Modifier) {
    val item = questionnaireItem()
    if (!item.invalid) return
    BasicText(
        text ?: if (item.required) "Choose an answer to continue." else "Choose an answer or skip this question.",
        modifier = modifier
            .pullUp(12.dp)
            .semantics { liveRegion = LiveRegionMode.Assertive },
        style = Typography.sm.copy(color = EsuissTheme.colors.danger),
    )
}

@Composable
fun QuestionnaireActions(modifier: Modifier = Modifier, content: @Composable () -> Unit) {
    Layout(content = content, modifier = modifier.fillMaxWidth().heightIn(min = 44.dp)) { measurables, constraints ->
        val loose = constraints.copy(minWidth = 0, minHeight = 0)
        val placeables = measurables.map { it.measure(loose) }
        val previous = measurables.map { it.layoutId == QuestionnairePreviousSlot }
        val gap = 8.dp.roundToPx()
        val width = constraints.maxWidth
        val height = constraints.constrainHeight(placeables.maxOfOrNull { it.height } ?: 0)
        layout(width, height) {
            var start = 0
            placeables.forEachIndexed { i, placeable ->
                if (!previous[i] || placeable.width == 0) return@forEachIndexed
                placeable.place(start, (height - placeable.height) / 2)
                start += placeable.width + gap
            }
            var end = width
            placeables.indices.reversed().forEach { i ->
                val placeable = placeables[i]
                if (previous[i] || placeable.width == 0) return@forEach
                end -= placeable.width
                placeable.place(end, (height - placeable.height) / 2)
                end -= gap
            }
        }
    }
}

@Composable
private fun QuestionnaireNavigation(
    text: String,
    visible: Boolean,
    onClick: () -> Unit,
    modifier: Modifier,
    variant: ButtonVariant,
    size: ButtonSize,
    enabled: Boolean,
) {
    if (!visible) return
    Button(
        text = text,
        onClick = onClick,
        modifier = modifier.heightIn(min = 44.dp),
        variant = variant,
        size = size,
        enabled = enabled,
    )
}

@Composable
fun QuestionnairePrevious(
    modifier: Modifier = Modifier,
    text: String = "Previous",
    variant: ButtonVariant = ButtonVariant.Outline,
    size: ButtonSize = ButtonSize.Default,
    enabled: Boolean = true,
) {
    val state = useQuestionnaire()
    QuestionnaireNavigation(
        text,
        state.total > 1 && !state.first,
        state::goPrevious,
        modifier.layoutId(QuestionnairePreviousSlot),
        variant,
        size,
        enabled,
    )
}

@Composable
fun QuestionnaireSkip(
    modifier: Modifier = Modifier,
    text: String = "Skip",
    variant: ButtonVariant = ButtonVariant.Outline,
    size: ButtonSize = ButtonSize.Default,
    enabled: Boolean = true,
) {
    val state = useQuestionnaire()
    QuestionnaireNavigation(text, state.activeItemRequired == false, state::skipCurrent, modifier, variant, size, enabled)
}

@Composable
fun QuestionnaireNext(
    modifier: Modifier = Modifier,
    text: String = "Next",
    variant: ButtonVariant = ButtonVariant.Default,
    size: ButtonSize = ButtonSize.Default,
    enabled: Boolean = true,
) {
    val state = useQuestionnaire()
    QuestionnaireNavigation(text, state.total > 1 && !state.last, state::goNext, modifier, variant, size, enabled)
}

@Composable
fun QuestionnaireSubmit(
    modifier: Modifier = Modifier,
    text: String = "Submit",
    variant: ButtonVariant = ButtonVariant.Default,
    size: ButtonSize = ButtonSize.Default,
    enabled: Boolean = true,
) {
    val state = useQuestionnaire()
    QuestionnaireNavigation(text, state.total > 0 && state.last, state::submit, modifier, variant, size, enabled)
}
```

```kt title="kotlin/components/Button.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.style.TextDecoration
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class ButtonVariant { Default, Outline, Secondary, Tinted, Ghost, Plain, Destructive, Link }

enum class ButtonSize(
    val height: Dp,
    val horizontalPadding: Dp,
    val spacing: Dp,
    val iconSize: Dp,
    val blockRadius: Dp,
    val isIcon: Boolean,
) {
    Default(36.dp, 16.dp, 6.dp, 16.dp, Radius.md, false),
    Xs(24.dp, 11.dp, 4.dp, 12.dp, Radius.sm, false),
    Sm(32.dp, 12.dp, 4.dp, 16.dp, Radius.md, false),
    Lg(44.dp, 22.dp, 6.dp, 16.dp, Radius.lg, false),
    Xl(56.dp, 31.dp, 8.dp, 16.dp, Radius.xl, false),
    Icon(36.dp, 0.dp, 6.dp, 16.dp, Radius.md, true),
    IconXs(24.dp, 0.dp, 4.dp, 12.dp, Radius.sm, true),
    IconSm(32.dp, 0.dp, 4.dp, 16.dp, Radius.md, true),
    IconLg(44.dp, 0.dp, 6.dp, 16.dp, Radius.lg, true),
    IconXl(56.dp, 0.dp, 8.dp, 16.dp, Radius.xl, true),
    ;

    val textStyle: TextStyle
        get() = when (this) {
            Xs, IconXs -> Typography.xs2
            Lg, Xl -> Typography.base
            else -> Typography.sm
        }
}

@Composable
fun Button(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    variant: ButtonVariant = ButtonVariant.Default,
    size: ButtonSize = ButtonSize.Default,
    block: Boolean = false,
    enabled: Boolean = true,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val foreground = buttonForeground(variant, colors, enabled)
    val group = LocalButtonGroup.current?.takeIf { variant != ButtonVariant.Ghost && variant != ButtonVariant.Plain }
    RegisterButtonGroupOutline(group, variant == ButtonVariant.Outline)
    val shape = group.itemShape(if (block) RoundedCornerShape(size.blockRadius) else CircleShape)
    val sizing = when {
        block -> Modifier.fillMaxWidth().height(size.height)
        size.isIcon -> Modifier.size(size.height)
        else -> Modifier.height(size.height)
    }

    Row(
        modifier = modifier
            .then(sizing)
            .clip(shape)
            .background(buttonBackground(variant, colors, pressed && enabled, enabled), shape)
            .then(
                when {
                    variant != ButtonVariant.Outline -> Modifier
                    group != null -> Modifier.buttonGroupEdge(group, colors.separator)
                    else -> Modifier.border(1.dp, colors.separator, shape)
                },
            )
            .clickable(
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                role = Role.Button,
                onClick = onClick,
            )
            .padding(horizontal = size.horizontalPadding),
        horizontalArrangement = Arrangement.spacedBy(size.spacing, Alignment.CenterHorizontally),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalButtonGroup provides null,
            LocalContentStyle provides size.textStyle.copy(
                color = foreground,
                textDecoration = if (variant == ButtonVariant.Link && pressed && enabled) {
                    TextDecoration.Underline
                } else {
                    null
                },
            ),
            LocalContentColor provides foreground,
            LocalIconSize provides size.iconSize,
        ) {
            content()
        }
    }
}

@Composable
fun Button(
    text: String,
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    variant: ButtonVariant = ButtonVariant.Default,
    size: ButtonSize = ButtonSize.Default,
    block: Boolean = false,
    enabled: Boolean = true,
) {
    Button(onClick, modifier, variant, size, block, enabled) {
        BasicText(text, style = LocalContentStyle.current, maxLines = 1)
    }
}

private fun buttonForeground(variant: ButtonVariant, colors: Colors, enabled: Boolean): Color =
    when (variant) {
        ButtonVariant.Default -> colors.onAccent
        ButtonVariant.Outline, ButtonVariant.Secondary, ButtonVariant.Ghost ->
            if (enabled) colors.label else colors.labelQuaternary
        ButtonVariant.Tinted, ButtonVariant.Plain ->
            if (enabled) colors.link else colors.link.copy(alpha = 0.4f)
        ButtonVariant.Destructive ->
            if (enabled) colors.danger else colors.danger.copy(alpha = 0.4f)
        ButtonVariant.Link -> if (enabled) colors.link else colors.labelQuaternary
    }

private fun buttonBackground(variant: ButtonVariant, colors: Colors, pressed: Boolean, enabled: Boolean): Color =
    when (variant) {
        ButtonVariant.Default -> when {
            !enabled -> colors.accentDisabled
            pressed -> colors.accentPressed
            else -> colors.accent
        }
        ButtonVariant.Outline -> when {
            pressed -> colors.itemPressed
            colors.isDark -> Color.Transparent
            else -> colors.surface
        }
        ButtonVariant.Secondary -> when {
            !enabled -> colors.controlDisabled
            pressed -> colors.controlPressed
            else -> colors.control
        }
        ButtonVariant.Tinted -> if (pressed) colors.accentSurfacePressed else colors.accentSurface
        ButtonVariant.Ghost -> if (pressed) colors.itemPressed else Color.Transparent
        ButtonVariant.Plain -> if (pressed) colors.itemPressed else Color.Transparent
        ButtonVariant.Destructive -> if (pressed) colors.dangerSurfacePressed else colors.dangerSurface
        ButtonVariant.Link -> Color.Transparent
    }
```

```kt title="kotlin/components/ButtonGroup.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.CornerSize
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.Stable
import androidx.compose.runtime.compositionLocalOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.drawBehind
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.drawOutline
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.graphics.drawscope.translate
import androidx.compose.ui.graphics.takeOrElse
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.Placeable
import androidx.compose.ui.layout.layout
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.layout.onPlaced
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.semantics.isTraversalGroup
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.constrainHeight
import androidx.compose.ui.unit.constrainWidth
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class ButtonGroupOrientation { Horizontal, Vertical }

@Stable
internal class ButtonGroupState(val orientation: ButtonGroupOrientation) {
    var nested by mutableIntStateOf(0)
    var outlined by mutableIntStateOf(0)
}

internal val LocalButtonGroup = compositionLocalOf<ButtonGroupState?> { null }

internal object ButtonGroupFill

private object ButtonGroupDivider

internal fun ButtonGroupState?.itemShape(default: Shape): Shape = if (this == null) default else RectangleShape

@Immutable
internal class ButtonGroupItem(val shape: Shape, val modifier: Modifier)

@Composable
internal fun rememberButtonGroupItem(group: ButtonGroupState?, default: Shape): ButtonGroupItem {
    var edges by remember { mutableIntStateOf(0) }
    val horizontal = group?.orientation != ButtonGroupOrientation.Vertical
    val rtl = LocalLayoutDirection.current == LayoutDirection.Rtl
    val shape = remember(edges, horizontal) {
        val round = if (horizontal) CornerSize(50) else CornerSize(Radius.xl2)
        val square = CornerSize(0)
        val start = if (edges and 1 != 0) round else square
        val end = if (edges and 2 != 0) round else square
        if (horizontal) {
            RoundedCornerShape(topStart = start, topEnd = end, bottomEnd = end, bottomStart = start)
        } else {
            RoundedCornerShape(topStart = start, topEnd = start, bottomEnd = end, bottomStart = end)
        }
    }
    if (group == null || group.nested > 0) return ButtonGroupItem(default, Modifier)
    return ButtonGroupItem(
        shape = shape,
        modifier = Modifier.onPlaced { coordinates ->
            val parent = coordinates.parentLayoutCoordinates ?: return@onPlaced
            val bounds = parent.localBoundingBoxOf(coordinates, clipBounds = false)
            val first: Boolean
            val last: Boolean
            if (horizontal) {
                val left = bounds.left <= 0.5f
                val right = bounds.right >= parent.size.width - 0.5f
                first = if (rtl) right else left
                last = if (rtl) left else right
            } else {
                first = bounds.top <= 0.5f
                last = bounds.bottom >= parent.size.height - 0.5f
            }
            edges = (if (first) 1 else 0) or (if (last) 2 else 0)
        },
    )
}

internal fun Modifier.buttonGroupEdge(group: ButtonGroupState?, color: Color): Modifier {
    if (group == null) return this
    return drawBehind {
        val stroke = 1.dp.toPx()
        if (group.orientation == ButtonGroupOrientation.Horizontal) {
            val x = if (layoutDirection == LayoutDirection.Rtl) 0f else size.width - stroke
            drawRect(color, Offset(x, 0f), Size(stroke, size.height))
        } else {
            drawRect(color, Offset(0f, size.height - stroke), Size(size.width, stroke))
        }
    }
}

@Composable
internal fun RegisterButtonGroupOutline(group: ButtonGroupState?, outlined: Boolean) {
    DisposableEffect(group, outlined) {
        if (group != null && outlined) group.outlined += 1
        onDispose {
            if (group != null && outlined) group.outlined -= 1
        }
    }
}

@Composable
fun ButtonGroup(
    modifier: Modifier = Modifier,
    orientation: ButtonGroupOrientation = ButtonGroupOrientation.Horizontal,
    content: @Composable () -> Unit,
) {
    val parent = LocalButtonGroup.current
    DisposableEffect(parent) {
        parent?.let { it.nested += 1 }
        onDispose { parent?.let { it.nested -= 1 } }
    }
    val state = remember(orientation) { ButtonGroupState(orientation) }
    val colors = EsuissTheme.colors
    val joined = state.nested == 0
    val horizontal = orientation == ButtonGroupOrientation.Horizontal
    val shape = if (horizontal) CircleShape else RoundedCornerShape(Radius.xl2)
    val outline = colors.separator
    Layout(
        content = {
            CompositionLocalProvider(LocalButtonGroup provides state, content = content)
        },
        modifier = modifier
            .semantics { isTraversalGroup = true }
            .then(
                if (joined) {
                    Modifier
                        .clip(shape)
                        .drawWithContent {
                            drawContent()
                            if (state.outlined > 0) {
                                val stroke = 1.dp.toPx()
                                val inset = stroke / 2
                                val path = shape.createOutline(
                                    Size(size.width - stroke, size.height - stroke),
                                    layoutDirection,
                                    this,
                                )
                                translate(inset, inset) {
                                    drawOutline(path, outline, style = Stroke(stroke))
                                }
                            }
                        }
                } else {
                    Modifier
                },
            ),
    ) { measurables, constraints ->
        val gap = if (joined) 0 else 8.dp.roundToPx()
        val items = measurables.filter { it.layoutId != ButtonGroupDivider }
        if (horizontal) {
            val height = if (constraints.hasFixedHeight) {
                constraints.maxHeight
            } else {
                constraints.constrainHeight(items.maxOfOrNull { it.maxIntrinsicHeight(Constraints.Infinity) } ?: 0)
            }
            val fills = measurables.count { it.layoutId == ButtonGroupFill }
            val placeables = arrayOfNulls<Placeable>(measurables.size)
            var used = 0
            measurables.forEachIndexed { index, measurable ->
                if (measurable.layoutId != ButtonGroupFill) {
                    val placeable = measurable.measure(Constraints(minHeight = height, maxHeight = height))
                    placeables[index] = placeable
                    used += placeable.width
                }
            }
            val gaps = gap * (items.size - 1).coerceAtLeast(0)
            val remaining = if (constraints.hasBoundedWidth) {
                (constraints.maxWidth - used - gaps).coerceAtLeast(0)
            } else {
                0
            }
            measurables.forEachIndexed { index, measurable ->
                if (measurable.layoutId == ButtonGroupFill) {
                    val placeable = if (constraints.hasBoundedWidth) {
                        val width = remaining / fills
                        measurable.measure(Constraints(width, width, height, height))
                    } else {
                        measurable.measure(Constraints(minHeight = height, maxHeight = height))
                    }
                    placeables[index] = placeable
                    used += placeable.width
                }
            }
            val width = constraints.constrainWidth(used + gaps)
            layout(width, height) {
                var x = 0
                measurables.forEachIndexed { index, measurable ->
                    val placeable = placeables[index] ?: return@forEachIndexed
                    val divider = measurable.layoutId == ButtonGroupDivider
                    placeable.placeRelative(x, 0, zIndex = if (divider) 1f else 0f)
                    if (!divider) x += placeable.width + gap
                }
            }
        } else {
            val width = if (constraints.hasFixedWidth) {
                constraints.maxWidth
            } else {
                constraints.constrainWidth(items.maxOfOrNull { it.maxIntrinsicWidth(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map { it.measure(Constraints(minWidth = width, maxWidth = width)) }
            val gaps = gap * (items.size - 1).coerceAtLeast(0)
            val height = constraints.constrainHeight(
                placeables.filterIndexed { index, _ -> measurables[index].layoutId != ButtonGroupDivider }.sumOf { it.height } + gaps,
            )
            layout(width, height) {
                var y = 0
                measurables.forEachIndexed { index, measurable ->
                    val divider = measurable.layoutId == ButtonGroupDivider
                    placeables[index].placeRelative(0, y, zIndex = if (divider) 1f else 0f)
                    if (!divider) y += placeables[index].height + gap
                }
            }
        }
    }
}

@Composable
fun ButtonGroupText(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val shape = LocalButtonGroup.current.itemShape(CircleShape)
    Row(
        modifier = modifier
            .clip(shape)
            .background(colors.control, shape)
            .padding(horizontal = 10.dp),
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalButtonGroup provides null,
            LocalContentStyle provides Typography.sm.copy(color = colors.label),
            LocalContentColor provides colors.label,
            LocalIconSize provides 16.dp,
        ) {
            content()
        }
    }
}

@Composable
fun ButtonGroupSeparator(
    modifier: Modifier = Modifier,
    orientation: Orientation = Orientation.Vertical,
    color: Color = Color.Unspecified,
) {
    val line = color.takeOrElse { EsuissTheme.colors.label.copy(alpha = 0.2f) }
    Box(
        modifier = modifier
            .layoutId(ButtonGroupDivider)
            .then(
                if (orientation == Orientation.Vertical) {
                    Modifier.layout { measurable, constraints ->
                        val placeable = measurable.measure(constraints.copy(minWidth = 0, maxWidth = 0))
                        layout(0, placeable.height) { placeable.place(0, 0) }
                    }
                } else {
                    Modifier.layout { measurable, constraints ->
                        val placeable = measurable.measure(constraints.copy(minHeight = 0, maxHeight = 0))
                        layout(placeable.width, 0) { placeable.place(0, 0) }
                    }
                },
            )
            .drawBehind {
                val stroke = 1.dp.toPx()
                val inset = 9.dp.toPx()
                if (orientation == Orientation.Vertical) {
                    val x = if (layoutDirection == LayoutDirection.Rtl) -stroke else 0f
                    drawRect(line, Offset(x, inset), Size(stroke, (size.height - inset * 2).coerceAtLeast(0f)))
                } else {
                    drawRect(line, Offset(inset, 0f), Size((size.width - inset * 2).coerceAtLeast(0f), stroke))
                }
            },
    )
}
```

```kt title="kotlin/components/Checkbox.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.selection.triStateToggleable
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.error
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.state.ToggleableState
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.Check
import com.adamglin.phosphoricons.regular.Minus
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.shadow

@Composable
fun Checkbox(
    checked: Boolean,
    onCheckedChange: ((Boolean) -> Unit)?,
    modifier: Modifier = Modifier,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = LocalFieldState.current.invalid,
    interactionSource: MutableInteractionSource? = null,
) {
    TriStateCheckbox(
        state = ToggleableState(checked),
        onClick = onCheckedChange?.let { { it(!checked) } },
        modifier = modifier,
        enabled = enabled,
        invalid = invalid,
        interactionSource = interactionSource,
    )
}

@Composable
fun TriStateCheckbox(
    state: ToggleableState,
    onClick: (() -> Unit)?,
    modifier: Modifier = Modifier,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = LocalFieldState.current.invalid,
    interactionSource: MutableInteractionSource? = null,
) {
    val colors = EsuissTheme.colors
    val haptics = rememberHaptics()
    val source = interactionSource ?: remember { MutableInteractionSource() }
    val pressed by source.collectIsPressedAsState()
    val on = state != ToggleableState.Off
    val shape = RoundedCornerShape(4.dp)
    val look = selectionControlLook(colors, on, enabled, invalid, pressed)
    val toggle = if (onClick != null) {
        Modifier
            .triStateToggleable(
                state = state,
                interactionSource = source,
                indication = null,
                enabled = enabled,
                role = Role.Checkbox,
                onClick = {
                    haptics.toggle(state != ToggleableState.On)
                    onClick()
                },
            )
            .formTouchTarget()
    } else {
        Modifier
    }
    Box(
        modifier = modifier
            .then(toggle)
            .then(if (invalid) Modifier.semantics { error("Invalid") } else Modifier)
            .size(16.dp)
            .then(if (look.shadow) Modifier.shadow(FormShadowXs, shape) else Modifier)
            .background(look.background, shape)
            .border(1.dp, look.border, shape),
        contentAlignment = Alignment.Center,
    ) {
        if (on) {
            Icon(
                if (state == ToggleableState.Indeterminate) PhosphorIcons.Regular.Minus else PhosphorIcons.Regular.Check,
                contentDescription = null,
                size = 14.dp,
                tint = colors.onAccent,
            )
        }
    }
}

internal class SelectionControlLook(val background: Color, val border: Color, val shadow: Boolean)

internal fun selectionControlLook(
    colors: Colors,
    on: Boolean,
    enabled: Boolean,
    invalid: Boolean,
    pressed: Boolean,
): SelectionControlLook = when {
    on && !enabled -> SelectionControlLook(colors.accentDisabled, Color.Transparent, false)
    on -> {
        val color = if (pressed) colors.accentPressed else colors.accent
        SelectionControlLook(color, color, false)
    }
    !enabled -> SelectionControlLook(
        colors.controlDisabled,
        if (colors.isDark) Color.Transparent else colors.label.copy(alpha = 0.1f),
        false,
    )
    colors.isDark -> SelectionControlLook(
        colors.labelQuaternary,
        if (invalid) colors.danger else Color.Transparent,
        false,
    )
    else -> SelectionControlLook(
        if (pressed) colors.control else colors.surface,
        if (invalid) colors.danger else colors.label.copy(alpha = 0.25f),
        true,
    )
}
```

```kt title="kotlin/components/Content.kt"
package com.esuiss.ui.components

import androidx.compose.runtime.compositionLocalOf
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp

val LocalContentStyle = compositionLocalOf { TextStyle.Default }

val LocalContentColor = compositionLocalOf { Color.Unspecified }

val LocalIconSize = compositionLocalOf { 20.dp }
```

```kt title="kotlin/components/Field.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.LayoutScopeMarker
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.layout.layout
import androidx.compose.ui.platform.LocalConfiguration
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class FieldOrientation { Vertical, Horizontal, Responsive }

enum class FieldGroupVariant { Default, Inset }

enum class FieldLegendVariant { Legend, Label }

@Immutable
internal class FieldState(val enabled: Boolean, val invalid: Boolean)

internal val LocalFieldState = staticCompositionLocalOf { FieldState(enabled = true, invalid = false) }

private val LocalFieldSetInset = staticCompositionLocalOf { false }

private val LocalFieldGroupVariant = staticCompositionLocalOf<FieldGroupVariant?> { null }

private val LocalFieldInset = staticCompositionLocalOf { false }

@LayoutScopeMarker
@Immutable
interface FieldScope {
    fun Modifier.weight(weight: Float): Modifier
}

private class RowFieldScope(private val scope: RowScope) : FieldScope {
    override fun Modifier.weight(weight: Float): Modifier = with(scope) { this@weight.weight(weight, true) }
}

private object ColumnFieldScope : FieldScope {
    override fun Modifier.weight(weight: Float): Modifier = this
}

@Composable
fun FieldSet(
    modifier: Modifier = Modifier,
    variant: FieldGroupVariant = FieldGroupVariant.Default,
    enabled: Boolean = true,
    content: @Composable ColumnScope.() -> Unit,
) {
    val inset = variant == FieldGroupVariant.Inset
    CompositionLocalProvider(
        LocalFieldSetInset provides inset,
        LocalFieldState provides FieldState(enabled, LocalFieldState.current.invalid),
    ) {
        Column(
            modifier = modifier.fillMaxWidth(),
            verticalArrangement = Arrangement.spacedBy(if (inset) 8.dp else 24.dp),
            content = content,
        )
    }
}

@Composable
fun FieldLegend(
    text: String,
    modifier: Modifier = Modifier,
    variant: FieldLegendVariant = FieldLegendVariant.Legend,
) {
    val colors = EsuissTheme.colors
    val inset = LocalFieldSetInset.current
    val enabled = LocalFieldState.current.enabled
    val style = if (inset) {
        Typography.xs.copy(color = if (enabled) colors.labelSecondary else colors.labelQuaternary)
    } else {
        Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary, fontWeight = FontWeight.SemiBold)
    }
    BasicText(
        text = if (inset) text.uppercase() else text,
        modifier = modifier
            .then(if (variant == FieldLegendVariant.Legend) Modifier.semantics { heading() } else Modifier)
            .padding(start = if (inset) 16.dp else 0.dp, bottom = if (inset) 0.dp else 12.dp),
        style = style,
    )
}

@Composable
fun FieldGroup(
    modifier: Modifier = Modifier,
    variant: FieldGroupVariant = FieldGroupVariant.Default,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    CompositionLocalProvider(
        LocalFieldSetInset provides false,
        LocalFieldGroupVariant provides variant,
    ) {
        if (variant == FieldGroupVariant.Inset) {
            FormDividedStack(
                orientation = Orientation.Vertical,
                dividerColor = colors.separator,
                modifier = modifier
                    .fillMaxWidth()
                    .clip(RoundedCornerShape(Radius.xl2))
                    .background(colors.surfaceSecondary),
                dividerInsetStart = 16.dp,
                content = content,
            )
        } else {
            Column(
                modifier = modifier.fillMaxWidth(),
                verticalArrangement = Arrangement.spacedBy(28.dp),
            ) {
                content()
            }
        }
    }
}

@Composable
fun Field(
    modifier: Modifier = Modifier,
    orientation: FieldOrientation = FieldOrientation.Vertical,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = false,
    content: @Composable FieldScope.() -> Unit,
) {
    val inset = LocalFieldGroupVariant.current == FieldGroupVariant.Inset
    val horizontal = when (orientation) {
        FieldOrientation.Vertical -> false
        FieldOrientation.Horizontal -> true
        FieldOrientation.Responsive -> LocalConfiguration.current.screenWidthDp >= 768
    }
    val sizing = modifier
        .fillMaxWidth()
        .then(if (inset) Modifier.heightIn(min = 44.dp).padding(horizontal = 16.dp, vertical = 6.dp) else Modifier)
    CompositionLocalProvider(
        LocalFieldGroupVariant provides null,
        LocalFieldInset provides inset,
        LocalFieldState provides FieldState(enabled, invalid),
    ) {
        if (horizontal) {
            Row(
                modifier = sizing,
                horizontalArrangement = Arrangement.spacedBy(12.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                val scope = remember(this) { RowFieldScope(this) }
                scope.content()
            }
        } else {
            Column(
                modifier = sizing,
                verticalArrangement = Arrangement.spacedBy(12.dp, Alignment.CenterVertically),
            ) {
                ColumnFieldScope.content()
            }
        }
    }
}

@Composable
fun FieldScope.FieldContent(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(
        modifier = modifier.weight(1f),
        verticalArrangement = Arrangement.spacedBy(4.dp),
        content = content,
    )
}

@Composable
fun FieldLabel(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalFieldState.current.enabled
    BasicText(
        text = text,
        modifier = modifier,
        style = Typography.base.copy(
            color = if (enabled) colors.label else colors.labelQuaternary,
            fontWeight = if (LocalFieldInset.current) FontWeight.Normal else FontWeight.SemiBold,
        ),
    )
}

@Composable
fun FieldTitle(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalFieldState.current.enabled
    BasicText(
        text = text,
        modifier = modifier,
        style = Typography.base.copy(
            color = if (enabled) colors.label else colors.labelQuaternary,
            fontWeight = FontWeight.SemiBold,
        ),
    )
}

@Composable
fun FieldDescription(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val inset = LocalFieldSetInset.current
    BasicText(
        text = text,
        modifier = modifier.padding(start = if (inset) 16.dp else 0.dp),
        style = (if (inset) Typography.xs else Typography.sm).copy(color = colors.labelSecondary),
    )
}

@Composable
fun FieldSeparator(
    modifier: Modifier = Modifier,
    text: String? = null,
) {
    val colors = EsuissTheme.colors
    Box(
        modifier = modifier
            .fillMaxWidth()
            .layout { measurable, constraints ->
                val placeable = measurable.measure(constraints)
                val overlap = 8.dp.roundToPx()
                val height = (placeable.height - overlap * 2).coerceAtLeast(0)
                layout(placeable.width, height) { placeable.place(0, -overlap) }
            }
            .heightIn(min = 20.dp),
        contentAlignment = Alignment.Center,
    ) {
        Separator()
        if (text != null) {
            BasicText(
                text = text,
                modifier = Modifier.background(colors.surface).padding(horizontal = 8.dp),
                style = Typography.sm.copy(color = colors.labelSecondary),
            )
        }
    }
}

@Composable
fun FieldError(text: String?, modifier: Modifier = Modifier) {
    if (text.isNullOrEmpty()) return
    BasicText(
        text = text,
        modifier = modifier.semantics { liveRegion = LiveRegionMode.Polite },
        style = Typography.sm.copy(color = EsuissTheme.colors.danger),
    )
}

@Composable
fun FieldError(errors: List<String?>, modifier: Modifier = Modifier) {
    val messages = errors.filterNotNull().filter { it.isNotEmpty() }.distinct()
    val text = when (messages.size) {
        0 -> null
        1 -> messages[0]
        else -> messages.joinToString("\n") { "• $it" }
    }
    FieldError(text, modifier)
}
```

```kt title="kotlin/components/FormSupport.kt"
package com.esuiss.ui.components

import android.provider.Settings
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.text.selection.TextSelectionColors
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.layout
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.constrainHeight
import androidx.compose.ui.unit.constrainWidth
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.Shadow

internal val FormShadowXs = Shadow(0.dp, 1.dp, 2.dp, Color.Black.copy(alpha = 0.05f))

internal val FormShadowSm = Shadow(0.dp, 1.dp, 3.dp, Color.Black.copy(alpha = 0.1f))

internal val FormEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

internal fun Modifier.formTouchTarget(): Modifier = layout { measurable, constraints ->
    val minimum = 48.dp.roundToPx()
    val placeable = measurable.measure(constraints)
    val width = constraints.constrainWidth(maxOf(placeable.width, minimum))
    val height = constraints.constrainHeight(maxOf(placeable.height, minimum))
    layout(width, height) {
        placeable.place((width - placeable.width) / 2, (height - placeable.height) / 2)
    }
}

@Composable
internal fun formReducedMotion(): Boolean {
    val context = LocalContext.current
    return remember(context) {
        Settings.Global.getFloat(context.contentResolver, Settings.Global.ANIMATOR_DURATION_SCALE, 1f) == 0f
    }
}

internal fun formSelectionColors(colors: Colors) = TextSelectionColors(
    handleColor = colors.accent,
    backgroundColor = colors.accent.copy(alpha = 0.3f),
)

internal fun Modifier.formInputSurface(
    colors: Colors,
    shape: Shape,
    focused: Boolean,
    invalid: Boolean,
    enabled: Boolean,
): Modifier {
    val background = when {
        !enabled -> colors.controlDisabled
        invalid -> colors.danger.copy(alpha = if (colors.isDark) 0.1f else 0.05f)
        else -> colors.control
    }
    val border = when {
        invalid -> colors.danger
        focused -> colors.focus
        else -> Color.Transparent
    }
    return clip(shape).background(background, shape).border(1.dp, border, shape)
}

@Composable
internal fun FormDividedStack(
    orientation: Orientation,
    dividerColor: Color,
    modifier: Modifier = Modifier,
    dividerInsetStart: Dp = 0.dp,
    content: @Composable () -> Unit,
) {
    val boundaries = remember { mutableStateOf(IntArray(0)) }
    val vertical = orientation == Orientation.Vertical
    Layout(
        content = content,
        modifier = modifier.drawWithContent {
            drawContent()
            val stroke = 1.dp.toPx()
            val inset = dividerInsetStart.toPx()
            boundaries.value.forEach { position ->
                if (vertical) {
                    val start = if (layoutDirection == LayoutDirection.Rtl) 0f else inset
                    drawRect(dividerColor, Offset(start, position.toFloat()), Size(size.width - inset, stroke))
                } else {
                    val x = if (layoutDirection == LayoutDirection.Rtl) size.width - position - stroke else position.toFloat()
                    drawRect(dividerColor, Offset(x, 0f), Size(stroke, size.height))
                }
            }
        },
    ) { measurables, constraints ->
        if (vertical) {
            val width = if (constraints.hasFixedWidth) {
                constraints.maxWidth
            } else {
                constraints.constrainWidth(measurables.maxOfOrNull { it.maxIntrinsicWidth(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map {
                it.measure(Constraints(minWidth = width, maxWidth = width))
            }
            val offsets = IntArray(placeables.size)
            var y = 0
            placeables.forEachIndexed { index, placeable ->
                offsets[index] = y
                y += placeable.height
            }
            val next = offsets.drop(1).toIntArray()
            if (!next.contentEquals(boundaries.value)) boundaries.value = next
            layout(width, constraints.constrainHeight(y)) {
                placeables.forEachIndexed { index, placeable -> placeable.placeRelative(0, offsets[index]) }
            }
        } else {
            val height = if (constraints.hasFixedHeight) {
                constraints.maxHeight
            } else {
                constraints.constrainHeight(measurables.maxOfOrNull { it.maxIntrinsicHeight(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map {
                it.measure(Constraints(minHeight = height, maxHeight = height))
            }
            val offsets = IntArray(placeables.size)
            var x = 0
            placeables.forEachIndexed { index, placeable ->
                offsets[index] = x
                x += placeable.width
            }
            val next = offsets.drop(1).toIntArray()
            if (!next.contentEquals(boundaries.value)) boundaries.value = next
            layout(constraints.constrainWidth(x), height) {
                placeables.forEachIndexed { index, placeable -> placeable.placeRelative(offsets[index], 0) }
            }
        }
    }
}
```

```kt title="kotlin/components/Haptics.kt"
package com.esuiss.ui.components

import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.hapticfeedback.HapticFeedback
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.platform.LocalHapticFeedback

val LocalHapticsEnabled = staticCompositionLocalOf { true }

@Composable
fun ProvideHaptics(enabled: Boolean, content: @Composable () -> Unit) {
    CompositionLocalProvider(LocalHapticsEnabled provides enabled, content = content)
}

internal class Haptics(private val feedback: HapticFeedback, private val enabled: Boolean) {
    fun perform(type: HapticFeedbackType) {
        if (enabled) feedback.performHapticFeedback(type)
    }

    fun toggle(on: Boolean) = perform(if (on) HapticFeedbackType.ToggleOn else HapticFeedbackType.ToggleOff)

    fun selection() = perform(HapticFeedbackType.SegmentTick)
}

@Composable
internal fun rememberHaptics(): Haptics {
    val feedback = LocalHapticFeedback.current
    val enabled = LocalHapticsEnabled.current
    return remember(feedback, enabled) { Haptics(feedback, enabled) }
}
```

```kt title="kotlin/components/Icon.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.size
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.ColorFilter
import androidx.compose.ui.graphics.takeOrElse
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.unit.Dp
import com.esuiss.ui.theme.EsuissTheme

@Composable
fun Icon(
    imageVector: ImageVector,
    contentDescription: String?,
    modifier: Modifier = Modifier,
    size: Dp = LocalIconSize.current,
    tint: Color = LocalContentColor.current.takeOrElse { EsuissTheme.colors.label },
) {
    Image(
        imageVector = imageVector,
        contentDescription = contentDescription,
        modifier = modifier.size(size),
        colorFilter = ColorFilter.tint(tint),
    )
}
```

```kt title="kotlin/components/Input.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsFocusedAsState
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.text.BasicTextField
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.foundation.text.selection.LocalTextSelectionColors
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.SolidColor
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.semantics.error
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.input.VisualTransformation
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class InputSize(
    internal val height: Dp,
    internal val horizontalPadding: Dp,
    internal val radius: Dp,
) {
    Default(44.dp, 12.dp, Radius.lg),
    Md(36.dp, 12.dp, Radius.lg),
    Sm(32.dp, 10.dp, Radius.md),
}

@Composable
fun Input(
    value: String,
    onValueChange: (String) -> Unit,
    modifier: Modifier = Modifier,
    size: InputSize = InputSize.Default,
    enabled: Boolean = LocalFieldState.current.enabled,
    readOnly: Boolean = false,
    invalid: Boolean = LocalFieldState.current.invalid,
    placeholder: String? = null,
    keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
    keyboardActions: KeyboardActions = KeyboardActions.Default,
    visualTransformation: VisualTransformation = VisualTransformation.None,
    interactionSource: MutableInteractionSource? = null,
) {
    val colors = EsuissTheme.colors
    val source = interactionSource ?: remember { MutableInteractionSource() }
    val focused by source.collectIsFocusedAsState()
    val group = LocalButtonGroup.current
    val item = rememberButtonGroupItem(group, RoundedCornerShape(size.radius))
    val textStyle = (if (size == InputSize.Default) Typography.base else Typography.sm)
        .copy(color = if (enabled) colors.label else colors.labelQuaternary)
    CompositionLocalProvider(LocalTextSelectionColors provides formSelectionColors(colors)) {
        BasicTextField(
            value = value,
            onValueChange = onValueChange,
            modifier = modifier
                .then(if (group != null) Modifier.layoutId(ButtonGroupFill) else Modifier)
                .then(item.modifier)
                .fillMaxWidth()
                .height(size.height)
                .formInputSurface(colors, item.shape, focused, invalid, enabled)
                .then(if (invalid) Modifier.semantics { error("Invalid") } else Modifier),
            enabled = enabled,
            readOnly = readOnly,
            textStyle = textStyle,
            keyboardOptions = keyboardOptions,
            keyboardActions = keyboardActions,
            singleLine = true,
            visualTransformation = visualTransformation,
            interactionSource = source,
            cursorBrush = SolidColor(colors.accent),
            decorationBox = { inner ->
                Box(
                    modifier = Modifier.padding(horizontal = size.horizontalPadding),
                    contentAlignment = Alignment.CenterStart,
                ) {
                    if (value.isEmpty() && placeholder != null) {
                        BasicText(
                            placeholder,
                            style = textStyle.copy(color = if (enabled) colors.labelSecondary else colors.labelQuaternary),
                            maxLines = 1,
                        )
                    }
                    inner()
                }
            },
        )
    }
}
```

```kt title="kotlin/components/Label.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Composable
fun Label(
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val color = if (enabled) colors.label else colors.labelQuaternary
    Row(
        modifier = modifier,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalContentStyle provides Typography.base.copy(color = color, fontWeight = FontWeight.SemiBold),
            LocalContentColor provides color,
        ) {
            content()
        }
    }
}

@Composable
fun Label(
    text: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
) {
    Label(modifier, enabled) {
        BasicText(text, style = LocalContentStyle.current)
    }
}
```

```kt title="kotlin/components/Separator.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxHeight
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.width
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme

@Composable
fun Separator(
    modifier: Modifier = Modifier,
    orientation: Orientation = Orientation.Horizontal,
) {
    val sizing = if (orientation == Orientation.Horizontal) {
        Modifier.fillMaxWidth().height(1.dp)
    } else {
        Modifier.fillMaxHeight().width(1.dp)
    }
    Box(modifier.then(sizing).background(EsuissTheme.colors.separator))
}
```

4. Update the `com.esuiss.ui` package names to match your project.

## Usage

```tsx
import { Questionnaire, QuestionnaireProgress, QuestionnaireItem, QuestionnaireTitle, QuestionnaireDescription, QuestionnaireChoices, QuestionnaireChoice, QuestionnaireChoiceDescription, QuestionnaireInput, QuestionnaireError, QuestionnaireActions, QuestionnairePrevious, QuestionnaireSkip, QuestionnaireNext, QuestionnaireSubmit } from "@/components/ui/questionnaire"
```

```tsx
<Onboarding />
```

Give every `QuestionnaireItem` a unique `name`; answers are collected under that name. Mark items `required` to block moving on without an answer; optional items show the Skip button. `QuestionnaireError` appears only when the item is invalid and has a default message you can replace.

The active item is uncontrolled through `defaultItem` or controlled with `item` and `onItemChange`. `onSubmit` receives the collected values: a string for single-answer items and a string array for `multiple` items.

`QuestionnaireChoice` supports `defaultChecked`, or controlled `checked` with `onCheckedChange`. `QuestionnaireInput` takes a `type` that sets the keyboard, autocomplete and secure entry. `QuestionnaireProgress` shows "Question 1 of 3" by default and accepts a render function. Use `useQuestionnaireContext` to build custom controls, or `useQuestionnaire` for the underlying state.

## Examples

### Mid flow

Starts on the second question with `defaultItem`.

![Preview](https://uim.suiss.app/previews/components-questionnaire--mid-flow.light.webp)

```tsx
import * as React from "react"
import { View } from "react-native"
import { Questionnaire, QuestionnaireActions, QuestionnaireChoice, QuestionnaireChoices, QuestionnaireDescription, QuestionnaireError, QuestionnaireInput, QuestionnaireItem, QuestionnaireNext, QuestionnairePrevious, QuestionnaireProgress, QuestionnaireSkip, QuestionnaireSubmit, QuestionnaireTitle, type QuestionnaireValues } from "@/components/ui/questionnaire"
import { Text } from "@/components/ui/text"

function Actions() {
  return (
    <QuestionnaireActions>
      <QuestionnairePrevious />
      <QuestionnaireSkip />
      <QuestionnaireNext />
      <QuestionnaireSubmit />
    </QuestionnaireActions>
  )
}

function Result({ values }: { values: QuestionnaireValues | null }) {
  if (!values) return null
  return (
    <Text role="status" className="text-sm text-label-secondary">
      {`Submitted: ${JSON.stringify(values)}`}
    </Text>
  )
}

function Onboarding({
  defaultItem,
  attempted = false,
}: {
  defaultItem?: string
  attempted?: boolean
}) {
  const [values, setValues] = React.useState<QuestionnaireValues | null>(null)
  return (
    <View className="w-full gap-4">
      <Questionnaire defaultItem={defaultItem} onSubmit={setValues}>
        <QuestionnaireProgress />
        <QuestionnaireItem name="role" required invalid={attempted}>
          <QuestionnaireTitle>
            What best describes your role?
          </QuestionnaireTitle>
          <QuestionnaireDescription>
            This helps us tailor the setup to your team.
          </QuestionnaireDescription>
          <QuestionnaireChoices>
            <QuestionnaireChoice value="engineering">
              Engineering
            </QuestionnaireChoice>
            <QuestionnaireChoice value="design">Design</QuestionnaireChoice>
            <QuestionnaireChoice value="product">Product</QuestionnaireChoice>
            <QuestionnaireChoice value="other">
              Something else
            </QuestionnaireChoice>
          </QuestionnaireChoices>
          <QuestionnaireError />
        </QuestionnaireItem>
        <QuestionnaireItem name="team-size">
          <QuestionnaireTitle>How large is your team?</QuestionnaireTitle>
          <QuestionnaireChoices>
            <QuestionnaireChoice value="solo">Just me</QuestionnaireChoice>
            <QuestionnaireChoice value="small" defaultChecked>
              2 to 10 people
            </QuestionnaireChoice>
            <QuestionnaireChoice value="medium">
              11 to 50 people
            </QuestionnaireChoice>
            <QuestionnaireChoice value="large">
              More than 50 people
            </QuestionnaireChoice>
          </QuestionnaireChoices>
          <QuestionnaireError />
        </QuestionnaireItem>
        <QuestionnaireItem name="company" required>
          <QuestionnaireTitle>What is your company called?</QuestionnaireTitle>
          <QuestionnaireInput placeholder="Acme Inc." />
          <QuestionnaireError>
            Enter a company name to continue.
          </QuestionnaireError>
        </QuestionnaireItem>
        <Actions />
      </Questionnaire>
      <Result values={values} />
    </View>
  )
}

export function QuestionnaireMidFlowExample() {
  return (
    <Onboarding defaultItem="team-size" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QuestionnaireMidFlowExample: View {
  var body: some View {
    QuestionnaireOnboarding(defaultItem: "team-size")
  }
}

struct QuestionnaireStoryActions: View {
  var body: some View {
    QuestionnaireActions {
      QuestionnairePrevious()
      QuestionnaireSkip()
      QuestionnaireNext()
      QuestionnaireSubmit()
    }
  }
}

struct QuestionnaireOnboarding: View {
  var attempted = false

  @State private var controller: QuestionnaireController
  @State private var submitted: String?

  init(defaultItem: String? = nil, attempted: Bool = false) {
    self.attempted = attempted
    _controller = State(initialValue: QuestionnaireController(
      defaultItem: defaultItem,
      defaultValues: ["team-size": ["small"]]
    ))
  }

  var body: some View {
    VStack(alignment: .leading, spacing: 16) {
      Questionnaire(controller: controller) {
        QuestionnaireProgress()
        QuestionnaireItem(name: "role", required: true, invalid: attempted) {
          QuestionnaireTitle("What best describes your role?")
          QuestionnaireDescription("This helps us tailor the setup to your team.")
          QuestionnaireChoices {
            QuestionnaireChoice("Engineering", value: "engineering")
            QuestionnaireChoice("Design", value: "design")
            QuestionnaireChoice("Product", value: "product")
            QuestionnaireChoice("Something else", value: "other")
          }
          QuestionnaireError()
        }
        QuestionnaireItem(name: "team-size") {
          QuestionnaireTitle("How large is your team?")
          QuestionnaireChoices {
            QuestionnaireChoice("Just me", value: "solo")
            QuestionnaireChoice("2 to 10 people", value: "small")
            QuestionnaireChoice("11 to 50 people", value: "medium")
            QuestionnaireChoice("More than 50 people", value: "large")
          }
          QuestionnaireError()
        }
        QuestionnaireItem(name: "company", required: true) {
          QuestionnaireTitle("What is your company called?")
          QuestionnaireInput("Acme Inc.")
          QuestionnaireError("Enter a company name to continue.")
        }
        QuestionnaireStoryActions()
      }
      if let submitted {
        Text(verbatim: submitted)
          .textStyle(.sm)
          .foregroundStyle(Color.labelSecondary)
          .accessibilityAddTraits(.updatesFrequently)
      }
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .onAppear {
      let controller = controller
      controller.onSubmit = { answers in
        let fields = controller.sequence.compactMap { name -> String? in
          guard let value = answers[name]?.first else { return nil }
          return "\"\(name)\":\"\(value)\""
        }
        submitted = "Submitted: {\(fields.joined(separator: ","))}"
      }
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Questionnaire
import com.esuiss.ui.components.QuestionnaireActions
import com.esuiss.ui.components.QuestionnaireChoice
import com.esuiss.ui.components.QuestionnaireChoices
import com.esuiss.ui.components.QuestionnaireDescription
import com.esuiss.ui.components.QuestionnaireError
import com.esuiss.ui.components.QuestionnaireInput
import com.esuiss.ui.components.QuestionnaireItem
import com.esuiss.ui.components.QuestionnaireNext
import com.esuiss.ui.components.QuestionnairePrevious
import com.esuiss.ui.components.QuestionnaireProgress
import com.esuiss.ui.components.QuestionnaireSkip
import com.esuiss.ui.components.QuestionnaireSubmit
import com.esuiss.ui.components.QuestionnaireTitle
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.rememberQuestionnaireState
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Composable
fun QuestionnaireMidFlowExample() {
    QuestionnaireOnboarding(defaultItem = "team-size")
}

fun questionnaireJson(values: Map<String, List<String>>): String =
    values.entries.joinToString(",", "{", "}") { (key, list) ->
        "\"$key\":" + list.joinToString(",", "[", "]") { "\"$it\"" }
    }

@Composable
fun QuestionnaireActionsRow() {
    QuestionnaireActions {
        QuestionnairePrevious()
        QuestionnaireSkip()
        QuestionnaireNext()
        QuestionnaireSubmit()
    }
}

@Composable
fun QuestionnaireResult(values: String?) {
    if (values == null) return
    Text(
        "Submitted: $values",
        modifier = Modifier.semantics { liveRegion = LiveRegionMode.Polite },
        style = Typography.sm,
        color = EsuissTheme.colors.labelSecondary,
    )
}

@Composable
fun QuestionnaireOnboarding(defaultItem: String? = null, attempted: Boolean = false) {
    var values by rememberSaveable { mutableStateOf<String?>(null) }
    val state = rememberQuestionnaireState(defaultItem = defaultItem)
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Questionnaire(state = state, onSubmit = { values = questionnaireJson(it) }) {
            QuestionnaireProgress()
            QuestionnaireItem(name = "role", required = true, invalid = attempted) {
                QuestionnaireTitle("What best describes your role?")
                QuestionnaireDescription("This helps us tailor the setup to your team.")
                QuestionnaireChoices {
                    QuestionnaireChoice("Engineering", value = "engineering")
                    QuestionnaireChoice("Design", value = "design")
                    QuestionnaireChoice("Product", value = "product")
                    QuestionnaireChoice("Something else", value = "other")
                }
                QuestionnaireError()
            }
            QuestionnaireItem(name = "team-size") {
                QuestionnaireTitle("How large is your team?")
                QuestionnaireChoices {
                    QuestionnaireChoice("Just me", value = "solo")
                    QuestionnaireChoice("2 to 10 people", value = "small", defaultChecked = true)
                    QuestionnaireChoice("11 to 50 people", value = "medium")
                    QuestionnaireChoice("More than 50 people", value = "large")
                }
                QuestionnaireError()
            }
            QuestionnaireItem(name = "company", required = true) {
                QuestionnaireTitle("What is your company called?")
                QuestionnaireInput(placeholder = "Acme Inc.")
                QuestionnaireError("Enter a company name to continue.")
            }
            QuestionnaireActionsRow()
        }
        QuestionnaireResult(values)
    }
}
```

### Invalid

A required question shown in its invalid state with an error message.

![Preview](https://uim.suiss.app/previews/components-questionnaire--invalid.light.webp)

```tsx
import * as React from "react"
import { View } from "react-native"
import { Questionnaire, QuestionnaireActions, QuestionnaireChoice, QuestionnaireChoices, QuestionnaireDescription, QuestionnaireError, QuestionnaireInput, QuestionnaireItem, QuestionnaireNext, QuestionnairePrevious, QuestionnaireProgress, QuestionnaireSkip, QuestionnaireSubmit, QuestionnaireTitle, type QuestionnaireValues } from "@/components/ui/questionnaire"
import { Text } from "@/components/ui/text"

function Actions() {
  return (
    <QuestionnaireActions>
      <QuestionnairePrevious />
      <QuestionnaireSkip />
      <QuestionnaireNext />
      <QuestionnaireSubmit />
    </QuestionnaireActions>
  )
}

function Result({ values }: { values: QuestionnaireValues | null }) {
  if (!values) return null
  return (
    <Text role="status" className="text-sm text-label-secondary">
      {`Submitted: ${JSON.stringify(values)}`}
    </Text>
  )
}

function Onboarding({
  defaultItem,
  attempted = false,
}: {
  defaultItem?: string
  attempted?: boolean
}) {
  const [values, setValues] = React.useState<QuestionnaireValues | null>(null)
  return (
    <View className="w-full gap-4">
      <Questionnaire defaultItem={defaultItem} onSubmit={setValues}>
        <QuestionnaireProgress />
        <QuestionnaireItem name="role" required invalid={attempted}>
          <QuestionnaireTitle>
            What best describes your role?
          </QuestionnaireTitle>
          <QuestionnaireDescription>
            This helps us tailor the setup to your team.
          </QuestionnaireDescription>
          <QuestionnaireChoices>
            <QuestionnaireChoice value="engineering">
              Engineering
            </QuestionnaireChoice>
            <QuestionnaireChoice value="design">Design</QuestionnaireChoice>
            <QuestionnaireChoice value="product">Product</QuestionnaireChoice>
            <QuestionnaireChoice value="other">
              Something else
            </QuestionnaireChoice>
          </QuestionnaireChoices>
          <QuestionnaireError />
        </QuestionnaireItem>
        <QuestionnaireItem name="team-size">
          <QuestionnaireTitle>How large is your team?</QuestionnaireTitle>
          <QuestionnaireChoices>
            <QuestionnaireChoice value="solo">Just me</QuestionnaireChoice>
            <QuestionnaireChoice value="small" defaultChecked>
              2 to 10 people
            </QuestionnaireChoice>
            <QuestionnaireChoice value="medium">
              11 to 50 people
            </QuestionnaireChoice>
            <QuestionnaireChoice value="large">
              More than 50 people
            </QuestionnaireChoice>
          </QuestionnaireChoices>
          <QuestionnaireError />
        </QuestionnaireItem>
        <QuestionnaireItem name="company" required>
          <QuestionnaireTitle>What is your company called?</QuestionnaireTitle>
          <QuestionnaireInput placeholder="Acme Inc." />
          <QuestionnaireError>
            Enter a company name to continue.
          </QuestionnaireError>
        </QuestionnaireItem>
        <Actions />
      </Questionnaire>
      <Result values={values} />
    </View>
  )
}

export function QuestionnaireInvalidExample() {
  return (
    <Onboarding attempted />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QuestionnaireInvalidExample: View {
  var body: some View {
    QuestionnaireOnboarding(attempted: true)
  }
}

struct QuestionnaireStoryActions: View {
  var body: some View {
    QuestionnaireActions {
      QuestionnairePrevious()
      QuestionnaireSkip()
      QuestionnaireNext()
      QuestionnaireSubmit()
    }
  }
}

struct QuestionnaireOnboarding: View {
  var attempted = false

  @State private var controller: QuestionnaireController
  @State private var submitted: String?

  init(defaultItem: String? = nil, attempted: Bool = false) {
    self.attempted = attempted
    _controller = State(initialValue: QuestionnaireController(
      defaultItem: defaultItem,
      defaultValues: ["team-size": ["small"]]
    ))
  }

  var body: some View {
    VStack(alignment: .leading, spacing: 16) {
      Questionnaire(controller: controller) {
        QuestionnaireProgress()
        QuestionnaireItem(name: "role", required: true, invalid: attempted) {
          QuestionnaireTitle("What best describes your role?")
          QuestionnaireDescription("This helps us tailor the setup to your team.")
          QuestionnaireChoices {
            QuestionnaireChoice("Engineering", value: "engineering")
            QuestionnaireChoice("Design", value: "design")
            QuestionnaireChoice("Product", value: "product")
            QuestionnaireChoice("Something else", value: "other")
          }
          QuestionnaireError()
        }
        QuestionnaireItem(name: "team-size") {
          QuestionnaireTitle("How large is your team?")
          QuestionnaireChoices {
            QuestionnaireChoice("Just me", value: "solo")
            QuestionnaireChoice("2 to 10 people", value: "small")
            QuestionnaireChoice("11 to 50 people", value: "medium")
            QuestionnaireChoice("More than 50 people", value: "large")
          }
          QuestionnaireError()
        }
        QuestionnaireItem(name: "company", required: true) {
          QuestionnaireTitle("What is your company called?")
          QuestionnaireInput("Acme Inc.")
          QuestionnaireError("Enter a company name to continue.")
        }
        QuestionnaireStoryActions()
      }
      if let submitted {
        Text(verbatim: submitted)
          .textStyle(.sm)
          .foregroundStyle(Color.labelSecondary)
          .accessibilityAddTraits(.updatesFrequently)
      }
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .onAppear {
      let controller = controller
      controller.onSubmit = { answers in
        let fields = controller.sequence.compactMap { name -> String? in
          guard let value = answers[name]?.first else { return nil }
          return "\"\(name)\":\"\(value)\""
        }
        submitted = "Submitted: {\(fields.joined(separator: ","))}"
      }
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Questionnaire
import com.esuiss.ui.components.QuestionnaireActions
import com.esuiss.ui.components.QuestionnaireChoice
import com.esuiss.ui.components.QuestionnaireChoices
import com.esuiss.ui.components.QuestionnaireDescription
import com.esuiss.ui.components.QuestionnaireError
import com.esuiss.ui.components.QuestionnaireInput
import com.esuiss.ui.components.QuestionnaireItem
import com.esuiss.ui.components.QuestionnaireNext
import com.esuiss.ui.components.QuestionnairePrevious
import com.esuiss.ui.components.QuestionnaireProgress
import com.esuiss.ui.components.QuestionnaireSkip
import com.esuiss.ui.components.QuestionnaireSubmit
import com.esuiss.ui.components.QuestionnaireTitle
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.rememberQuestionnaireState
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Composable
fun QuestionnaireInvalidExample() {
    QuestionnaireOnboarding(attempted = true)
}

fun questionnaireJson(values: Map<String, List<String>>): String =
    values.entries.joinToString(",", "{", "}") { (key, list) ->
        "\"$key\":" + list.joinToString(",", "[", "]") { "\"$it\"" }
    }

@Composable
fun QuestionnaireActionsRow() {
    QuestionnaireActions {
        QuestionnairePrevious()
        QuestionnaireSkip()
        QuestionnaireNext()
        QuestionnaireSubmit()
    }
}

@Composable
fun QuestionnaireResult(values: String?) {
    if (values == null) return
    Text(
        "Submitted: $values",
        modifier = Modifier.semantics { liveRegion = LiveRegionMode.Polite },
        style = Typography.sm,
        color = EsuissTheme.colors.labelSecondary,
    )
}

@Composable
fun QuestionnaireOnboarding(defaultItem: String? = null, attempted: Boolean = false) {
    var values by rememberSaveable { mutableStateOf<String?>(null) }
    val state = rememberQuestionnaireState(defaultItem = defaultItem)
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Questionnaire(state = state, onSubmit = { values = questionnaireJson(it) }) {
            QuestionnaireProgress()
            QuestionnaireItem(name = "role", required = true, invalid = attempted) {
                QuestionnaireTitle("What best describes your role?")
                QuestionnaireDescription("This helps us tailor the setup to your team.")
                QuestionnaireChoices {
                    QuestionnaireChoice("Engineering", value = "engineering")
                    QuestionnaireChoice("Design", value = "design")
                    QuestionnaireChoice("Product", value = "product")
                    QuestionnaireChoice("Something else", value = "other")
                }
                QuestionnaireError()
            }
            QuestionnaireItem(name = "team-size") {
                QuestionnaireTitle("How large is your team?")
                QuestionnaireChoices {
                    QuestionnaireChoice("Just me", value = "solo")
                    QuestionnaireChoice("2 to 10 people", value = "small", defaultChecked = true)
                    QuestionnaireChoice("11 to 50 people", value = "medium")
                    QuestionnaireChoice("More than 50 people", value = "large")
                }
                QuestionnaireError()
            }
            QuestionnaireItem(name = "company", required = true) {
                QuestionnaireTitle("What is your company called?")
                QuestionnaireInput(placeholder = "Acme Inc.")
                QuestionnaireError("Enter a company name to continue.")
            }
            QuestionnaireActionsRow()
        }
        QuestionnaireResult(values)
    }
}
```

### Multiple choice

A `multiple` item that accepts several checked choices.

![Preview](https://uim.suiss.app/previews/components-questionnaire--multiple-choice.light.webp)

```tsx
import { Questionnaire, QuestionnaireActions, QuestionnaireChoice, QuestionnaireChoices, QuestionnaireDescription, QuestionnaireError, QuestionnaireItem, QuestionnaireNext, QuestionnairePrevious, QuestionnaireProgress, QuestionnaireSkip, QuestionnaireSubmit, QuestionnaireTitle } from "@/components/ui/questionnaire"

function Actions() {
  return (
    <QuestionnaireActions>
      <QuestionnairePrevious />
      <QuestionnaireSkip />
      <QuestionnaireNext />
      <QuestionnaireSubmit />
    </QuestionnaireActions>
  )
}

export function QuestionnaireMultipleChoiceExample() {
  return (
    <Questionnaire>
      <QuestionnaireProgress />
      <QuestionnaireItem name="features" multiple required>
        <QuestionnaireTitle>
          Which features do you plan to use?
        </QuestionnaireTitle>
        <QuestionnaireDescription>
          Select all that apply.
        </QuestionnaireDescription>
        <QuestionnaireChoices>
          <QuestionnaireChoice value="analytics" defaultChecked>
            Analytics
          </QuestionnaireChoice>
          <QuestionnaireChoice value="billing" defaultChecked>
            Billing
          </QuestionnaireChoice>
          <QuestionnaireChoice value="automations">
            Automations
          </QuestionnaireChoice>
          <QuestionnaireChoice value="integrations" disabled>
            Integrations
          </QuestionnaireChoice>
        </QuestionnaireChoices>
        <QuestionnaireError>Choose at least one feature.</QuestionnaireError>
      </QuestionnaireItem>
      <Actions />
    </Questionnaire>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QuestionnaireStoryActions: View {
  var body: some View {
    QuestionnaireActions {
      QuestionnairePrevious()
      QuestionnaireSkip()
      QuestionnaireNext()
      QuestionnaireSubmit()
    }
  }
}

struct QuestionnaireMultipleChoice: View {
  @State private var controller = QuestionnaireController(defaultValues: ["features": ["analytics", "billing"]])

  var body: some View {
    Questionnaire(controller: controller) {
      QuestionnaireProgress()
      QuestionnaireItem(name: "features", required: true, multiple: true) {
        QuestionnaireTitle("Which features do you plan to use?")
        QuestionnaireDescription("Select all that apply.")
        QuestionnaireChoices {
          QuestionnaireChoice("Analytics", value: "analytics")
          QuestionnaireChoice("Billing", value: "billing")
          QuestionnaireChoice("Automations", value: "automations")
          QuestionnaireChoice("Integrations", value: "integrations", disabled: true)
        }
        QuestionnaireError("Choose at least one feature.")
      }
      QuestionnaireStoryActions()
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.Questionnaire
import com.esuiss.ui.components.QuestionnaireActions
import com.esuiss.ui.components.QuestionnaireChoice
import com.esuiss.ui.components.QuestionnaireChoices
import com.esuiss.ui.components.QuestionnaireDescription
import com.esuiss.ui.components.QuestionnaireError
import com.esuiss.ui.components.QuestionnaireItem
import com.esuiss.ui.components.QuestionnaireNext
import com.esuiss.ui.components.QuestionnairePrevious
import com.esuiss.ui.components.QuestionnaireProgress
import com.esuiss.ui.components.QuestionnaireSkip
import com.esuiss.ui.components.QuestionnaireSubmit
import com.esuiss.ui.components.QuestionnaireTitle

@Composable
fun QuestionnaireActionsRow() {
    QuestionnaireActions {
        QuestionnairePrevious()
        QuestionnaireSkip()
        QuestionnaireNext()
        QuestionnaireSubmit()
    }
}

@Composable
fun QuestionnaireMultipleChoice() {
    Questionnaire(Modifier.fillMaxWidth()) {
        QuestionnaireProgress()
        QuestionnaireItem(name = "features", multiple = true, required = true) {
            QuestionnaireTitle("Which features do you plan to use?")
            QuestionnaireDescription("Select all that apply.")
            QuestionnaireChoices {
                QuestionnaireChoice("Analytics", value = "analytics", defaultChecked = true)
                QuestionnaireChoice("Billing", value = "billing", defaultChecked = true)
                QuestionnaireChoice("Automations", value = "automations")
                QuestionnaireChoice("Integrations", value = "integrations", enabled = false)
            }
            QuestionnaireError("Choose at least one feature.")
        }
        QuestionnaireActionsRow()
    }
}
```

### With choice descriptions

Choices with secondary text from `QuestionnaireChoiceDescription`.

![Preview](https://uim.suiss.app/previews/components-questionnaire--with-choice-descriptions.light.webp)

```tsx
import { Questionnaire, QuestionnaireActions, QuestionnaireChoice, QuestionnaireChoiceDescription, QuestionnaireChoices, QuestionnaireError, QuestionnaireItem, QuestionnaireNext, QuestionnairePrevious, QuestionnaireProgress, QuestionnaireSkip, QuestionnaireSubmit, QuestionnaireTitle } from "@/components/ui/questionnaire"

function Actions() {
  return (
    <QuestionnaireActions>
      <QuestionnairePrevious />
      <QuestionnaireSkip />
      <QuestionnaireNext />
      <QuestionnaireSubmit />
    </QuestionnaireActions>
  )
}

export function QuestionnaireWithChoiceDescriptionsExample() {
  return (
    <Questionnaire>
      <QuestionnaireProgress />
      <QuestionnaireItem name="plan" required>
        <QuestionnaireTitle>Which plan fits you best?</QuestionnaireTitle>
        <QuestionnaireChoices>
          <QuestionnaireChoice value="starter">
            Starter
            <QuestionnaireChoiceDescription>
              For individuals trying things out.
            </QuestionnaireChoiceDescription>
          </QuestionnaireChoice>
          <QuestionnaireChoice value="team" defaultChecked>
            Team
            <QuestionnaireChoiceDescription>
              Shared workspaces and roles for growing teams.
            </QuestionnaireChoiceDescription>
          </QuestionnaireChoice>
          <QuestionnaireChoice value="enterprise">
            Enterprise
            <QuestionnaireChoiceDescription>
              Single sign-on, audit logs, and priority support.
            </QuestionnaireChoiceDescription>
          </QuestionnaireChoice>
        </QuestionnaireChoices>
        <QuestionnaireError />
      </QuestionnaireItem>
      <Actions />
    </Questionnaire>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QuestionnaireStoryActions: View {
  var body: some View {
    QuestionnaireActions {
      QuestionnairePrevious()
      QuestionnaireSkip()
      QuestionnaireNext()
      QuestionnaireSubmit()
    }
  }
}

struct QuestionnaireChoiceDescriptions: View {
  @State private var controller = QuestionnaireController(defaultValues: ["plan": ["team"]])

  var body: some View {
    Questionnaire(controller: controller) {
      QuestionnaireProgress()
      QuestionnaireItem(name: "plan", required: true) {
        QuestionnaireTitle("Which plan fits you best?")
        QuestionnaireChoices {
          QuestionnaireChoice(value: "starter") {
            Text("Starter")
            QuestionnaireChoiceDescription("For individuals trying things out.")
          }
          QuestionnaireChoice(value: "team") {
            Text("Team")
            QuestionnaireChoiceDescription("Shared workspaces and roles for growing teams.")
          }
          QuestionnaireChoice(value: "enterprise") {
            Text("Enterprise")
            QuestionnaireChoiceDescription("Single sign-on, audit logs, and priority support.")
          }
        }
        QuestionnaireError()
      }
      QuestionnaireStoryActions()
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.Questionnaire
import com.esuiss.ui.components.QuestionnaireActions
import com.esuiss.ui.components.QuestionnaireChoice
import com.esuiss.ui.components.QuestionnaireChoiceDescription
import com.esuiss.ui.components.QuestionnaireChoices
import com.esuiss.ui.components.QuestionnaireError
import com.esuiss.ui.components.QuestionnaireItem
import com.esuiss.ui.components.QuestionnaireNext
import com.esuiss.ui.components.QuestionnairePrevious
import com.esuiss.ui.components.QuestionnaireProgress
import com.esuiss.ui.components.QuestionnaireSkip
import com.esuiss.ui.components.QuestionnaireSubmit
import com.esuiss.ui.components.QuestionnaireTitle
import com.esuiss.ui.components.Text

@Composable
fun QuestionnaireActionsRow() {
    QuestionnaireActions {
        QuestionnairePrevious()
        QuestionnaireSkip()
        QuestionnaireNext()
        QuestionnaireSubmit()
    }
}

@Composable
fun QuestionnaireWithChoiceDescriptions() {
    Questionnaire(Modifier.fillMaxWidth()) {
        QuestionnaireProgress()
        QuestionnaireItem(name = "plan", required = true) {
            QuestionnaireTitle("Which plan fits you best?")
            QuestionnaireChoices {
                QuestionnaireChoice(value = "starter") {
                    Text("Starter")
                    QuestionnaireChoiceDescription("For individuals trying things out.")
                }
                QuestionnaireChoice(value = "team", defaultChecked = true) {
                    Text("Team")
                    QuestionnaireChoiceDescription("Shared workspaces and roles for growing teams.")
                }
                QuestionnaireChoice(value = "enterprise") {
                    Text("Enterprise")
                    QuestionnaireChoiceDescription("Single sign-on, audit logs, and priority support.")
                }
            }
            QuestionnaireError()
        }
        QuestionnaireActionsRow()
    }
}
```

### Text input

A required question answered with `QuestionnaireInput`.

![Preview](https://uim.suiss.app/previews/components-questionnaire--text-input.light.webp)

```tsx
import { Questionnaire, QuestionnaireActions, QuestionnaireDescription, QuestionnaireError, QuestionnaireInput, QuestionnaireItem, QuestionnaireNext, QuestionnairePrevious, QuestionnaireProgress, QuestionnaireSkip, QuestionnaireSubmit, QuestionnaireTitle } from "@/components/ui/questionnaire"

function Actions() {
  return (
    <QuestionnaireActions>
      <QuestionnairePrevious />
      <QuestionnaireSkip />
      <QuestionnaireNext />
      <QuestionnaireSubmit />
    </QuestionnaireActions>
  )
}

export function QuestionnaireTextInputExample() {
  return (
    <Questionnaire>
      <QuestionnaireProgress />
      <QuestionnaireItem name="email" required>
        <QuestionnaireTitle>
          Where should we send your results?
        </QuestionnaireTitle>
        <QuestionnaireDescription>
          We only use your email to share the report.
        </QuestionnaireDescription>
        <QuestionnaireInput type="email" placeholder="you@example.com" />
        <QuestionnaireError>
          Enter an email address to continue.
        </QuestionnaireError>
      </QuestionnaireItem>
      <Actions />
    </Questionnaire>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QuestionnaireStoryActions: View {
  var body: some View {
    QuestionnaireActions {
      QuestionnairePrevious()
      QuestionnaireSkip()
      QuestionnaireNext()
      QuestionnaireSubmit()
    }
  }
}

struct QuestionnaireTextInput: View {
  @State private var controller = QuestionnaireController()

  var body: some View {
    Questionnaire(controller: controller) {
      QuestionnaireProgress()
      QuestionnaireItem(name: "email", required: true) {
        QuestionnaireTitle("Where should we send your results?")
        QuestionnaireDescription("We only use your email to share the report.")
        QuestionnaireInput("you@example.com", keyboard: .emailAddress, contentType: .emailAddress)
        QuestionnaireError("Enter an email address to continue.")
      }
      QuestionnaireStoryActions()
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.input.KeyboardType
import com.esuiss.ui.components.Questionnaire
import com.esuiss.ui.components.QuestionnaireActions
import com.esuiss.ui.components.QuestionnaireDescription
import com.esuiss.ui.components.QuestionnaireError
import com.esuiss.ui.components.QuestionnaireInput
import com.esuiss.ui.components.QuestionnaireItem
import com.esuiss.ui.components.QuestionnaireNext
import com.esuiss.ui.components.QuestionnairePrevious
import com.esuiss.ui.components.QuestionnaireProgress
import com.esuiss.ui.components.QuestionnaireSkip
import com.esuiss.ui.components.QuestionnaireSubmit
import com.esuiss.ui.components.QuestionnaireTitle

@Composable
fun QuestionnaireActionsRow() {
    QuestionnaireActions {
        QuestionnairePrevious()
        QuestionnaireSkip()
        QuestionnaireNext()
        QuestionnaireSubmit()
    }
}

@Composable
fun QuestionnaireTextInput() {
    Questionnaire(Modifier.fillMaxWidth()) {
        QuestionnaireProgress()
        QuestionnaireItem(name = "email", required = true) {
            QuestionnaireTitle("Where should we send your results?")
            QuestionnaireDescription("We only use your email to share the report.")
            QuestionnaireInput(
                placeholder = "you@example.com",
                keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Email),
            )
            QuestionnaireError("Enter an email address to continue.")
        }
        QuestionnaireActionsRow()
    }
}
```

## API Reference

### Questionnaire

Root that holds the state and the active question.

### QuestionnaireProgress

Shows the current question number and total.

### QuestionnaireItem

One question; shown only while active.

### QuestionnaireTitle

The question heading.

### QuestionnaireDescription

Secondary text under the title.

### QuestionnaireChoices

Stack of choice rows.

### QuestionnaireChoice

A selectable answer row.

### QuestionnaireChoiceDescription

Secondary text inside a choice.

### QuestionnaireInput

Text field for a typed answer.

### QuestionnaireError

Validation message shown when the item is invalid.

### QuestionnaireActions

Row for the navigation buttons.

### QuestionnairePrevious

Goes to the previous question.

### QuestionnaireSkip

Skips the active question when it is optional.

### QuestionnaireNext

Validates and moves to the next question.

### QuestionnaireSubmit

Validates all questions and calls `onSubmit` on the last step.

## Accessibility

- Each item has the `radiogroup` role, or `group` when `multiple`, and is labelled by its `QuestionnaireTitle`, which has the `heading` role.
- Choices have the `radio` or `checkbox` role with checked and disabled states.
- `QuestionnaireInput` is labelled by the title unless you pass an `accessibilityLabel`.
- `QuestionnaireProgress` has the `progressbar` role, a value such as "Question 2 of 3" and a polite live region.
- `QuestionnaireError` has the `alert` role with a polite live region.
- Slide transitions respect the system reduce motion setting.

## Notes

- Selecting a choice plays a selection haptic.
- Selected choices use `border-accent` and `bg-accent`; invalid items use `border-danger`.
- The slide direction flips for right-to-left layouts.
- Light and dark colors follow the system appearance.