# Toast

Brief notifications that slide up from the bottom of the screen, stack, and dismiss on a timer or with a swipe.

Toast 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/toast

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

```tsx
import { View } from "react-native"
import { Button } from "@/components/ui/button"
import { Text } from "@/components/ui/text"
import { Toaster, toast } from "@/components/ui/toast"

function wait(ms: number) {
  return new Promise<void>((resolve) => setTimeout(resolve, ms))
}

function Examples() {
  return (
    <View className="items-start gap-3">
      <Button
        variant="outline"
        onPress={() =>
          toast.add({
            title: "Event created",
            description: "Sunday, December 3 at 9:00 AM",
          })
        }
      >
        <Text>Show toast</Text>
      </Button>
      <Button
        variant="outline"
        onPress={() =>
          toast.add({
            title: "Message archived",
            type: "info",
            actionProps: {
              children: "Undo",
              onPress: () => toast.add({ title: "Restored", type: "success" }),
            },
          })
        }
      >
        <Text>With action</Text>
      </Button>
      <Button
        variant="outline"
        onPress={() =>
          toast.add({
            title: "Storage almost full",
            description: "Free up space to keep syncing.",
            type: "warning",
          })
        }
      >
        <Text>Warning</Text>
      </Button>
      <Button
        variant="outline"
        onPress={() =>
          toast.add({
            title: "Upload failed",
            description: "Check your connection and try again.",
            type: "error",
            priority: "high",
          })
        }
      >
        <Text>Error</Text>
      </Button>
      <Button
        variant="outline"
        onPress={() => {
          toast
            .promise(wait(2000), {
              loading: "Saving changes",
              success: "Changes saved",
              error: "Could not save changes",
            })
            .catch(() => undefined)
        }}
      >
        <Text>Promise</Text>
      </Button>
    </View>
  )
}

export function ToastExample() {
  return (
    <Toaster>
      <Examples />
    </Toaster>
  )
}
```

`Toaster` wraps your app in a toast provider and renders the queue through a portal into a full-screen viewport. On iOS the viewport sits inside a `FullWindowOverlay` from `react-native-screens`, so toasts appear above native modals. Each toast is a Reanimated view that slides in from the bottom edge, fades out downward, and is capped at 384 points wide.

Visible toasts stack with a small peek and shrink behind the frontmost one. Touching the stack expands it; it collapses again three seconds after the touch ends. Each toast shows an icon for its `type` (`success`, `info`, `warning`, `error`, or a spinner for `loading`), a title, a description, an optional action button and a close button.

## Installation

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

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

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

The CLI also adds what it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [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-safe-area-context react-native-screens react-native-svg react-native-worklets
```

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

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

```tsx title="uniwind/components/ui/toast.tsx"
import { cn } from "cn"
import { CheckIcon, ExclamationMarkIcon, XIcon } from "phosphor-react-native"
import * as React from "react"
import {
  ActivityIndicator,
  Platform,
  useWindowDimensions,
  View,
} from "react-native"
import {
  FadeOutDown,
  ReduceMotion,
  SlideInDown,
  useAnimatedStyle,
  withTiming,
} from "react-native-reanimated"
import { useSafeAreaInsets } from "react-native-safe-area-context"
import { FullWindowOverlay as RNFullWindowOverlay } from "react-native-screens"
import * as ToastPrimitive from "@/components/primitives/toast"
import { resolveClassName } from "@/components/primitives/use-render"
import { AnimatedView } from "@/components/ui/animated-view"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

const toast = ToastPrimitive.createToastManager()

const FullWindowOverlay =
  Platform.OS === "ios" ? RNFullWindowOverlay : React.Fragment

const GAP = 12

const PEEK = 12

const MAX_WIDTH = 384

const TIMING = { duration: 450, reduceMotion: ReduceMotion.System }

function ToastProvider(props: ToastPrimitive.ProviderProps) {
  return <ToastPrimitive.Provider {...props} />
}

function ToastPortal(props: ToastPrimitive.PortalProps) {
  return <ToastPrimitive.Portal {...props} />
}

function ToastViewport({
  className,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Viewport>) {
  return (
    <ToastPrimitive.Viewport
      className={(state) =>
        cn(
          "absolute top-0 right-0 bottom-0 left-0 z-50",
          resolveClassName(className, state)
        )
      }
      {...props}
    />
  )
}

function Toast({
  className,
  style,
  toast: toastItem,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Root>) {
  const position = ToastPrimitive.useToastPosition(toastItem.id)
  const insets = useSafeAreaInsets()
  const { width } = useWindowDimensions()
  const inset = Math.max(16, (width - MAX_WIDTH) / 2)
  const index = position.visibleIndex
  const expanded = position.expanded
  const scale = expanded ? 1 : Math.max(0, 1 - index * 0.1)
  const front = position.frontmostHeight
  const translateY = expanded
    ? -(position.offsetY + index * GAP)
    : -(index * PEEK) - (1 - scale) * front
  const height =
    !expanded && index > 0 && front > 0
      ? front
      : position.height > 0
        ? position.height
        : undefined
  const hidden = position.limited

  const stackStyle = useAnimatedStyle(
    () => ({
      opacity: withTiming(hidden ? 0 : 1, TIMING),
      transform: [
        { translateY: withTiming(translateY, TIMING) },
        { scale: withTiming(scale, TIMING) },
      ],
    }),
    [hidden, translateY, scale]
  )

  const heightStyle = useAnimatedStyle(
    () =>
      height === undefined
        ? {}
        : {
            height: withTiming(height, {
              duration: 150,
              reduceMotion: ReduceMotion.System,
            }),
          },
    [height]
  )

  return (
    <AnimatedView
      entering={SlideInDown.duration(450).reduceMotion(ReduceMotion.System)}
      exiting={FadeOutDown.duration(250).reduceMotion(ReduceMotion.System)}
      style={{
        position: "absolute",
        left: inset,
        right: inset,
        bottom: insets.bottom + 16,
        zIndex: 1000 - index,
        pointerEvents: hidden ? "none" : "box-none",
      }}
    >
      <AnimatedView
        style={[
          { transformOrigin: "bottom", pointerEvents: "box-none" },
          stackStyle,
        ]}
      >
        <ToastPrimitive.Root
          toast={toastItem}
          className={(state) =>
            cn(
              "w-full rounded-xl border border-label/5 bg-surface-raised shadow-[0_8px_32px_rgba(0,0,0,0.14)] dark:border-transparent dark:shadow-lg",
              resolveClassName(className, state)
            )
          }
          style={(state) => [
            heightStyle,
            typeof style === "function" ? style(state) : style,
          ]}
          {...props}
        />
      </AnimatedView>
    </AnimatedView>
  )
}

function ToastContent({
  className,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Content>) {
  const { behind } = ToastPrimitive.useToastRootContext("ToastContent")
  const fadeStyle = useAnimatedStyle(
    () => ({
      opacity: withTiming(behind ? 0 : 1, {
        duration: 250,
        reduceMotion: ReduceMotion.System,
      }),
    }),
    [behind]
  )
  return (
    <ToastPrimitive.Content
      render={<AnimatedView style={fadeStyle} />}
      className={(state) =>
        cn(
          "flex-row items-center gap-3 p-4",
          resolveClassName(className, state)
        )
      }
      {...props}
    />
  )
}

function ToastTitle({
  className,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Title>) {
  return (
    <ToastPrimitive.Title
      className={(state) =>
        cn(
          "text-sm font-semibold text-label",
          resolveClassName(className, state)
        )
      }
      {...props}
    />
  )
}

function ToastDescription({
  className,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Description>) {
  return (
    <ToastPrimitive.Description
      className={(state) =>
        cn("text-sm text-label-secondary", resolveClassName(className, state))
      }
      {...props}
    />
  )
}

function ToastAction({
  className,
  children,
  render = <Button variant="outline" size="sm" />,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Action>) {
  const { toast: toastItem } = ToastPrimitive.useToastRootContext("ToastAction")
  const content = children ?? toastItem.actionProps?.children
  if (content == null || content === false) return null
  return (
    <ToastPrimitive.Action
      render={render}
      className={(state) => cn("shrink-0", resolveClassName(className, state))}
      {...props}
    >
      {typeof content === "string" || typeof content === "number" ? (
        <Text>{content}</Text>
      ) : (
        content
      )}
    </ToastPrimitive.Action>
  )
}

function ToastClose({
  className,
  children,
  render = <Button variant="ghost" size="icon-sm" />,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Close>) {
  return (
    <ToastPrimitive.Close
      render={render}
      accessibilityLabel="Close toast"
      hitSlop={8}
      className={(state) => cn("shrink-0", resolveClassName(className, state))}
      {...props}
    >
      {children ?? <Icon as={XIcon} className="size-4 text-label-secondary" />}
    </ToastPrimitive.Close>
  )
}

const TINT: Record<string, string> = {
  success: "bg-green",
  info: "bg-accent",
  warning: "bg-orange",
  error: "bg-danger",
}

function ToastIcon({ type }: { type: string | undefined }) {
  if (type === "loading") {
    return (
      <View
        accessible={false}
        className="size-8 shrink-0 items-center justify-center"
      >
        <ActivityIndicator colorClassName="accent-accent" />
      </View>
    )
  }
  const tint = type ? TINT[type] : undefined
  if (!tint) return null
  const IconComponent =
    type === "success"
      ? CheckIcon
      : type === "error"
        ? XIcon
        : ExclamationMarkIcon
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      className={cn(
        "size-8 shrink-0 items-center justify-center rounded-full",
        tint
      )}
    >
      <View className={cn(type === "info" && "rotate-180")}>
        <Icon
          as={IconComponent}
          weight="bold"
          className="size-4 text-surface"
        />
      </View>
    </View>
  )
}

function ToastList() {
  const { toasts } = ToastPrimitive.useToastManager()
  return toasts.map((toastItem) => (
    <Toast key={toastItem.id} toast={toastItem}>
      <ToastContent>
        <ToastIcon type={toastItem.type} />
        <View className="min-w-0 flex-1 gap-1">
          <ToastTitle />
          <ToastDescription />
        </View>
        <ToastAction />
        <ToastClose />
      </ToastContent>
    </Toast>
  ))
}

function Toaster({
  children,
  toastManager = toast,
  portalHost,
  ...props
}: ToastPrimitive.ProviderProps & { portalHost?: string }) {
  return (
    <ToastProvider toastManager={toastManager} {...props}>
      {children}
      <ToastPortal hostName={portalHost}>
        <FullWindowOverlay>
          <ToastViewport>
            <ToastList />
          </ToastViewport>
        </FullWindowOverlay>
      </ToastPortal>
    </ToastProvider>
  )
}

const createToastManager = ToastPrimitive.createToastManager

const useToastManager = ToastPrimitive.useToastManager

export {
  createToastManager,
  Toast,
  ToastAction,
  ToastClose,
  ToastContent,
  ToastDescription,
  Toaster,
  ToastPortal,
  ToastProvider,
  ToastTitle,
  ToastViewport,
  toast,
  useToastManager,
}
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn nativewind phosphor-react-native react-native-reanimated react-native-safe-area-context react-native-screens react-native-svg react-native-worklets
```

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

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

```tsx title="nativewind/components/ui/toast.tsx"
import { cn } from "cn"
import { cssInterop } from "nativewind"
import { CheckIcon, ExclamationMarkIcon, XIcon } from "phosphor-react-native"
import * as React from "react"
import {
  ActivityIndicator,
  Platform,
  useWindowDimensions,
  View,
} from "react-native"
import {
  FadeOutDown,
  ReduceMotion,
  SlideInDown,
  useAnimatedStyle,
  withTiming,
} from "react-native-reanimated"
import { useSafeAreaInsets } from "react-native-safe-area-context"
import { FullWindowOverlay as RNFullWindowOverlay } from "react-native-screens"
import * as ToastPrimitive from "@/components/primitives/toast"
import { resolveClassName } from "@/components/primitives/use-render"
import { AnimatedView } from "@/components/ui/animated-view"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

cssInterop(ActivityIndicator, {
  className: { target: "style", nativeStyleToProp: { color: true } },
})

const toast = ToastPrimitive.createToastManager()

const FullWindowOverlay =
  Platform.OS === "ios" ? RNFullWindowOverlay : React.Fragment

const GAP = 12

const PEEK = 12

const MAX_WIDTH = 384

const TIMING = { duration: 450, reduceMotion: ReduceMotion.System }

function ToastProvider(props: ToastPrimitive.ProviderProps) {
  return <ToastPrimitive.Provider {...props} />
}

function ToastPortal(props: ToastPrimitive.PortalProps) {
  return <ToastPrimitive.Portal {...props} />
}

function ToastViewport({
  className,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Viewport>) {
  return (
    <ToastPrimitive.Viewport
      className={(state) =>
        cn(
          "absolute top-0 right-0 bottom-0 left-0 z-50",
          resolveClassName(className, state)
        )
      }
      {...props}
    />
  )
}

function Toast({
  className,
  style,
  toast: toastItem,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Root>) {
  const position = ToastPrimitive.useToastPosition(toastItem.id)
  const insets = useSafeAreaInsets()
  const { width } = useWindowDimensions()
  const inset = Math.max(16, (width - MAX_WIDTH) / 2)
  const index = position.visibleIndex
  const expanded = position.expanded
  const scale = expanded ? 1 : Math.max(0, 1 - index * 0.1)
  const front = position.frontmostHeight
  const translateY = expanded
    ? -(position.offsetY + index * GAP)
    : -(index * PEEK) - (1 - scale) * front
  const height =
    !expanded && index > 0 && front > 0
      ? front
      : position.height > 0
        ? position.height
        : undefined
  const hidden = position.limited

  const stackStyle = useAnimatedStyle(
    () => ({
      opacity: withTiming(hidden ? 0 : 1, TIMING),
      transform: [
        { translateY: withTiming(translateY, TIMING) },
        { scale: withTiming(scale, TIMING) },
      ],
    }),
    [hidden, translateY, scale]
  )

  const heightStyle = useAnimatedStyle(
    () =>
      height === undefined
        ? {}
        : {
            height: withTiming(height, {
              duration: 150,
              reduceMotion: ReduceMotion.System,
            }),
          },
    [height]
  )

  return (
    <AnimatedView
      entering={SlideInDown.duration(450).reduceMotion(ReduceMotion.System)}
      exiting={FadeOutDown.duration(250).reduceMotion(ReduceMotion.System)}
      style={{
        position: "absolute",
        left: inset,
        right: inset,
        bottom: insets.bottom + 16,
        zIndex: 1000 - index,
        pointerEvents: hidden ? "none" : "box-none",
      }}
    >
      <AnimatedView
        style={[
          { transformOrigin: "bottom", pointerEvents: "box-none" },
          stackStyle,
        ]}
      >
        <ToastPrimitive.Root
          toast={toastItem}
          className={(state) =>
            cn(
              "w-full rounded-xl border border-label-5 bg-surface-raised shadow-[0_8px_32px_rgba(0,0,0,0.14)] dark:border-transparent dark:shadow-lg",
              resolveClassName(className, state)
            )
          }
          style={(state) => [
            heightStyle,
            typeof style === "function" ? style(state) : style,
          ]}
          {...props}
        />
      </AnimatedView>
    </AnimatedView>
  )
}

function ToastContent({
  className,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Content>) {
  const { behind } = ToastPrimitive.useToastRootContext("ToastContent")
  const fadeStyle = useAnimatedStyle(
    () => ({
      opacity: withTiming(behind ? 0 : 1, {
        duration: 250,
        reduceMotion: ReduceMotion.System,
      }),
    }),
    [behind]
  )
  return (
    <ToastPrimitive.Content
      render={<AnimatedView style={fadeStyle} />}
      className={(state) =>
        cn(
          "flex-row items-center gap-3 p-4",
          resolveClassName(className, state)
        )
      }
      {...props}
    />
  )
}

function ToastTitle({
  className,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Title>) {
  return (
    <ToastPrimitive.Title
      className={(state) =>
        cn(
          "text-sm font-semibold text-label",
          resolveClassName(className, state)
        )
      }
      {...props}
    />
  )
}

function ToastDescription({
  className,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Description>) {
  return (
    <ToastPrimitive.Description
      className={(state) =>
        cn("text-sm text-label-secondary", resolveClassName(className, state))
      }
      {...props}
    />
  )
}

function ToastAction({
  className,
  children,
  render = <Button variant="outline" size="sm" />,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Action>) {
  const { toast: toastItem } = ToastPrimitive.useToastRootContext("ToastAction")
  const content = children ?? toastItem.actionProps?.children
  if (content == null || content === false) return null
  return (
    <ToastPrimitive.Action
      render={render}
      className={(state) => cn("shrink-0", resolveClassName(className, state))}
      {...props}
    >
      {typeof content === "string" || typeof content === "number" ? (
        <Text>{content}</Text>
      ) : (
        content
      )}
    </ToastPrimitive.Action>
  )
}

function ToastClose({
  className,
  children,
  render = <Button variant="ghost" size="icon-sm" />,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Close>) {
  return (
    <ToastPrimitive.Close
      render={render}
      accessibilityLabel="Close toast"
      hitSlop={8}
      className={(state) => cn("shrink-0", resolveClassName(className, state))}
      {...props}
    >
      {children ?? <Icon as={XIcon} className="size-4 text-label-secondary" />}
    </ToastPrimitive.Close>
  )
}

const TINT: Record<string, string> = {
  success: "bg-green",
  info: "bg-accent",
  warning: "bg-orange",
  error: "bg-danger",
}

function ToastIcon({ type }: { type: string | undefined }) {
  if (type === "loading") {
    return (
      <View
        accessible={false}
        className="size-8 shrink-0 items-center justify-center"
      >
        <ActivityIndicator className="text-accent" />
      </View>
    )
  }
  const tint = type ? TINT[type] : undefined
  if (!tint) return null
  const IconComponent =
    type === "success"
      ? CheckIcon
      : type === "error"
        ? XIcon
        : ExclamationMarkIcon
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      className={cn(
        "size-8 shrink-0 items-center justify-center rounded-full",
        tint
      )}
    >
      <View className={cn(type === "info" && "rotate-180")}>
        <Icon
          as={IconComponent}
          weight="bold"
          className="size-4 text-surface"
        />
      </View>
    </View>
  )
}

function ToastList() {
  const { toasts } = ToastPrimitive.useToastManager()
  return toasts.map((toastItem) => (
    <Toast key={toastItem.id} toast={toastItem}>
      <ToastContent>
        <ToastIcon type={toastItem.type} />
        <View className="min-w-0 flex-1 gap-1">
          <ToastTitle />
          <ToastDescription />
        </View>
        <ToastAction />
        <ToastClose />
      </ToastContent>
    </Toast>
  ))
}

function Toaster({
  children,
  toastManager = toast,
  portalHost,
  ...props
}: ToastPrimitive.ProviderProps & { portalHost?: string }) {
  return (
    <ToastProvider toastManager={toastManager} {...props}>
      {children}
      <ToastPortal hostName={portalHost}>
        <FullWindowOverlay>
          <ToastViewport>
            <ToastList />
          </ToastViewport>
        </FullWindowOverlay>
      </ToastPortal>
    </ToastProvider>
  )
}

const createToastManager = ToastPrimitive.createToastManager

const useToastManager = ToastPrimitive.useToastManager

export {
  createToastManager,
  Toast,
  ToastAction,
  ToastClose,
  ToastContent,
  ToastDescription,
  Toaster,
  ToastPortal,
  ToastProvider,
  ToastTitle,
  ToastViewport,
  toast,
  useToastManager,
}
```

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-safe-area-context react-native-screens react-native-svg react-native-worklets
```

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

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

```tsx title="stylesheet/components/ui/toast.tsx"
import { CheckIcon, ExclamationMarkIcon, XIcon } from "phosphor-react-native"
import * as React from "react"
import {
  ActivityIndicator,
  Platform,
  StyleSheet,
  useWindowDimensions,
  View,
} from "react-native"
import {
  FadeOutDown,
  ReduceMotion,
  SlideInDown,
  useAnimatedStyle,
  withTiming,
} from "react-native-reanimated"
import { useSafeAreaInsets } from "react-native-safe-area-context"
import { FullWindowOverlay as RNFullWindowOverlay } from "react-native-screens"
import * as ToastPrimitive from "@/components/primitives/toast"
import { AnimatedView } from "@/components/ui/animated-view"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"
import { fontSize, radius, shadow, useTheme } from "@/components/ui/theme"

const toast = ToastPrimitive.createToastManager()

const FullWindowOverlay =
  Platform.OS === "ios" ? RNFullWindowOverlay : React.Fragment

const GAP = 12

const PEEK = 12

const MAX_WIDTH = 384

const TIMING = { duration: 450, reduceMotion: ReduceMotion.System }

const styles = StyleSheet.create({
  viewport: { ...StyleSheet.absoluteFill, zIndex: 50 },
  stack: { transformOrigin: "bottom", pointerEvents: "box-none" },
  root: {
    width: "100%",
    borderRadius: radius.xl,
    borderWidth: 1,
  },
  rootShadow: { boxShadow: "0 8px 32px rgba(0, 0, 0, 0.14)" },
  content: {
    flexDirection: "row",
    alignItems: "center",
    gap: 12,
    padding: 16,
  },
  text: { minWidth: 0, flex: 1, gap: 4 },
  title: { ...fontSize.sm, fontWeight: "600" },
  description: { ...fontSize.sm },
  shrink: { flexShrink: 0 },
  icon: {
    width: 32,
    height: 32,
    flexShrink: 0,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: radius.full,
  },
  flipped: { transform: [{ rotate: "180deg" }] },
})

function withAlpha(hex: string, alpha: number) {
  const value = Number.parseInt(hex.slice(1), 16)
  return `rgba(${(value >> 16) & 255}, ${(value >> 8) & 255}, ${value & 255}, ${alpha})`
}

function ToastProvider(props: ToastPrimitive.ProviderProps) {
  return <ToastPrimitive.Provider {...props} />
}

function ToastPortal(props: ToastPrimitive.PortalProps) {
  return <ToastPrimitive.Portal {...props} />
}

function ToastViewport({
  style,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Viewport>) {
  return (
    <ToastPrimitive.Viewport
      style={(state) => [
        styles.viewport,
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    />
  )
}

function Toast({
  style,
  toast: toastItem,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Root>) {
  const { colors, isDark } = useTheme()
  const position = ToastPrimitive.useToastPosition(toastItem.id)
  const insets = useSafeAreaInsets()
  const { width } = useWindowDimensions()
  const inset = Math.max(16, (width - MAX_WIDTH) / 2)
  const index = position.visibleIndex
  const expanded = position.expanded
  const scale = expanded ? 1 : Math.max(0, 1 - index * 0.1)
  const front = position.frontmostHeight
  const translateY = expanded
    ? -(position.offsetY + index * GAP)
    : -(index * PEEK) - (1 - scale) * front
  const height =
    !expanded && index > 0 && front > 0
      ? front
      : position.height > 0
        ? position.height
        : undefined
  const hidden = position.limited

  const stackStyle = useAnimatedStyle(
    () => ({
      opacity: withTiming(hidden ? 0 : 1, TIMING),
      transform: [
        { translateY: withTiming(translateY, TIMING) },
        { scale: withTiming(scale, TIMING) },
      ],
    }),
    [hidden, translateY, scale]
  )

  const heightStyle = useAnimatedStyle(
    () =>
      height === undefined
        ? {}
        : {
            height: withTiming(height, {
              duration: 150,
              reduceMotion: ReduceMotion.System,
            }),
          },
    [height]
  )

  return (
    <AnimatedView
      entering={SlideInDown.duration(450).reduceMotion(ReduceMotion.System)}
      exiting={FadeOutDown.duration(250).reduceMotion(ReduceMotion.System)}
      style={{
        position: "absolute",
        left: inset,
        right: inset,
        bottom: insets.bottom + 16,
        zIndex: 1000 - index,
        pointerEvents: hidden ? "none" : "box-none",
      }}
    >
      <AnimatedView style={[styles.stack, stackStyle]}>
        <ToastPrimitive.Root
          toast={toastItem}
          style={(state) => [
            styles.root,
            {
              backgroundColor: colors.surfaceRaised,
              borderColor: isDark
                ? "transparent"
                : withAlpha(colors.label, 0.05),
            },
            isDark ? shadow.lg : styles.rootShadow,
            heightStyle,
            typeof style === "function" ? style(state) : style,
          ]}
          {...props}
        />
      </AnimatedView>
    </AnimatedView>
  )
}

function ToastContent({
  style,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Content>) {
  const { behind } = ToastPrimitive.useToastRootContext("ToastContent")
  const fadeStyle = useAnimatedStyle(
    () => ({
      opacity: withTiming(behind ? 0 : 1, {
        duration: 250,
        reduceMotion: ReduceMotion.System,
      }),
    }),
    [behind]
  )
  return (
    <ToastPrimitive.Content
      render={<AnimatedView style={fadeStyle} />}
      style={(state) => [
        styles.content,
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    />
  )
}

function ToastTitle({
  style,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Title>) {
  const { colors } = useTheme()
  return (
    <ToastPrimitive.Title
      style={(state) => [
        styles.title,
        { color: colors.label },
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    />
  )
}

function ToastDescription({
  style,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Description>) {
  const { colors } = useTheme()
  return (
    <ToastPrimitive.Description
      style={(state) => [
        styles.description,
        { color: colors.labelSecondary },
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    />
  )
}

function ToastAction({
  style,
  children,
  render = <Button variant="outline" size="sm" />,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Action>) {
  const { toast: toastItem } = ToastPrimitive.useToastRootContext("ToastAction")
  const content = children ?? toastItem.actionProps?.children
  if (content == null || content === false) return null
  return (
    <ToastPrimitive.Action
      render={render}
      style={(state) => [
        styles.shrink,
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    >
      {typeof content === "string" || typeof content === "number" ? (
        <Text>{content}</Text>
      ) : (
        content
      )}
    </ToastPrimitive.Action>
  )
}

function ToastClose({
  style,
  children,
  render = <Button variant="ghost" size="icon-sm" />,
  ...props
}: React.ComponentProps<typeof ToastPrimitive.Close>) {
  const { colors } = useTheme()
  return (
    <ToastPrimitive.Close
      render={render}
      accessibilityLabel="Close toast"
      hitSlop={8}
      style={(state) => [
        styles.shrink,
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    >
      {children ?? <Icon as={XIcon} size={16} color={colors.labelSecondary} />}
    </ToastPrimitive.Close>
  )
}

function ToastIcon({ type }: { type: string | undefined }) {
  const { colors } = useTheme()
  if (type === "loading") {
    return (
      <View accessible={false} style={styles.icon}>
        <ActivityIndicator color={colors.accent} />
      </View>
    )
  }
  const tint =
    type === "success"
      ? colors.green
      : type === "info"
        ? colors.accent
        : type === "warning"
          ? colors.orange
          : type === "error"
            ? colors.danger
            : undefined
  if (!tint) return null
  const IconComponent =
    type === "success"
      ? CheckIcon
      : type === "error"
        ? XIcon
        : ExclamationMarkIcon
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      style={[styles.icon, { backgroundColor: tint }]}
    >
      <View style={type === "info" ? styles.flipped : undefined}>
        <Icon
          as={IconComponent}
          weight="bold"
          size={16}
          color={colors.surface}
        />
      </View>
    </View>
  )
}

function ToastList() {
  const { toasts } = ToastPrimitive.useToastManager()
  return toasts.map((toastItem) => (
    <Toast key={toastItem.id} toast={toastItem}>
      <ToastContent>
        <ToastIcon type={toastItem.type} />
        <View style={styles.text}>
          <ToastTitle />
          <ToastDescription />
        </View>
        <ToastAction />
        <ToastClose />
      </ToastContent>
    </Toast>
  ))
}

function Toaster({
  children,
  toastManager = toast,
  portalHost,
  ...props
}: ToastPrimitive.ProviderProps & { portalHost?: string }) {
  return (
    <ToastProvider toastManager={toastManager} {...props}>
      {children}
      <ToastPortal hostName={portalHost}>
        <FullWindowOverlay>
          <ToastViewport>
            <ToastList />
          </ToastViewport>
        </FullWindowOverlay>
      </ToastPortal>
    </ToastProvider>
  )
}

const createToastManager = ToastPrimitive.createToastManager

const useToastManager = ToastPrimitive.useToastManager

export {
  createToastManager,
  Toast,
  ToastAction,
  ToastClose,
  ToastContent,
  ToastDescription,
  Toaster,
  ToastPortal,
  ToastProvider,
  ToastTitle,
  ToastViewport,
  toast,
  useToastManager,
}
```

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/Toast.swift"
import Observation
import PhosphorSwift
import SwiftUI

public enum ToastType: CaseIterable, Sendable {
  case `default`, success, info, warning, error, loading
}

public struct ToastAction: Sendable {
  public let title: LocalizedStringResource
  public let action: @MainActor @Sendable () -> Void

  public init(_ title: LocalizedStringResource, action: @escaping @MainActor @Sendable () -> Void) {
    self.title = title
    self.action = action
  }
}

public struct ToastItem: Identifiable, Sendable {
  public let id: UUID
  public var type: ToastType
  public var title: LocalizedStringResource
  public var description: LocalizedStringResource?
  public var action: ToastAction?
  public var duration: Duration?
}

@Observable
public final class ToastManager: @unchecked Sendable {
  public static let shared = ToastManager()

  public private(set) var toasts: [ToastItem] = []
  public var limit = 3

  @ObservationIgnored private var timers: [UUID: Task<Void, Never>] = [:]

  public init() {}

  @MainActor @discardableResult
  public func show(
    _ title: LocalizedStringResource,
    description: LocalizedStringResource? = nil,
    type: ToastType = .default,
    action: ToastAction? = nil,
    duration: Duration? = .seconds(5)
  ) -> UUID {
    let item = ToastItem(
      id: UUID(),
      type: type,
      title: title,
      description: description,
      action: action,
      duration: type == .loading ? nil : duration
    )
    toasts.append(item)
    schedule(item)
    announce(item)
    return item.id
  }

  @MainActor @discardableResult
  public func success(_ title: LocalizedStringResource, description: LocalizedStringResource? = nil, action: ToastAction? = nil) -> UUID {
    show(title, description: description, type: .success, action: action)
  }

  @MainActor @discardableResult
  public func info(_ title: LocalizedStringResource, description: LocalizedStringResource? = nil, action: ToastAction? = nil) -> UUID {
    show(title, description: description, type: .info, action: action)
  }

  @MainActor @discardableResult
  public func warning(_ title: LocalizedStringResource, description: LocalizedStringResource? = nil, action: ToastAction? = nil) -> UUID {
    show(title, description: description, type: .warning, action: action)
  }

  @MainActor @discardableResult
  public func error(_ title: LocalizedStringResource, description: LocalizedStringResource? = nil, action: ToastAction? = nil) -> UUID {
    show(title, description: description, type: .error, action: action)
  }

  @MainActor @discardableResult
  public func loading(_ title: LocalizedStringResource, description: LocalizedStringResource? = nil) -> UUID {
    show(title, description: description, type: .loading)
  }

  @MainActor
  public func update(
    _ id: UUID,
    title: LocalizedStringResource? = nil,
    description: LocalizedStringResource? = nil,
    type: ToastType? = nil,
    duration: Duration? = .seconds(5)
  ) {
    guard let index = toasts.firstIndex(where: { $0.id == id }) else { return }
    if let title { toasts[index].title = title }
    if let description { toasts[index].description = description }
    if let type { toasts[index].type = type }
    toasts[index].duration = toasts[index].type == .loading ? nil : duration
    schedule(toasts[index])
    announce(toasts[index])
  }

  @MainActor
  public func dismiss(_ id: UUID) {
    timers[id]?.cancel()
    timers[id] = nil
    toasts.removeAll { $0.id == id }
  }

  @MainActor
  public func dismissAll() {
    timers.values.forEach { $0.cancel() }
    timers.removeAll()
    toasts.removeAll()
  }

  @MainActor
  private func schedule(_ item: ToastItem) {
    timers[item.id]?.cancel()
    guard let duration = item.duration else {
      timers[item.id] = nil
      return
    }
    let id = item.id
    timers[id] = Task { @MainActor [weak self] in
      try? await Task.sleep(for: duration)
      guard !Task.isCancelled else { return }
      withAnimation(.easeOut(duration: 0.25)) { self?.dismiss(id) }
    }
  }

  @MainActor
  private func announce(_ item: ToastItem) {
    var text = String(localized: item.title)
    if let description = item.description {
      text += ". " + String(localized: description)
    }
    AccessibilityNotification.Announcement(text).post()
  }
}

extension EnvironmentValues {
  @Entry public var toastManager: ToastManager = .shared
}

extension View {
  public func toaster(_ manager: ToastManager = .shared) -> some View {
    overlay(alignment: .bottom) {
      ToastStack(manager: manager)
    }
    .environment(\.toastManager, manager)
  }
}

struct ToastStack: View {
  let manager: ToastManager

  @State private var expanded = false
  @State private var heights: [UUID: CGFloat] = [:]
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  var body: some View {
    let ordered = Array(manager.toasts.reversed())
    let front = ordered.first.flatMap { heights[$0.id] } ?? 0
    GeometryReader { proxy in
      let inset = max(16, (proxy.size.width - 384) / 2)
      ZStack(alignment: .bottom) {
        ForEach(Array(ordered.enumerated()), id: \.element.id) { index, item in
          let scale = expanded ? 1 : max(0, 1 - CGFloat(index) * 0.1)
          let offset = expanded
            ? -(ordered.prefix(index).reduce(0) { $0 + (heights[$1.id] ?? 0) } + CGFloat(index) * 12)
            : -(CGFloat(index) * 12) - (1 - scale) * front
          let behind = !expanded && index > 0
          ToastCard(item: item, behind: behind) {
            withAnimation(.easeOut(duration: 0.25)) { manager.dismiss(item.id) }
          }
          .onGeometryChange(for: CGFloat.self) { $0.size.height } action: { value in
            if !behind { heights[item.id] = value }
          }
          .frame(height: behind && front > 0 ? front : nil, alignment: .top)
          .clipped()
          .scaleEffect(scale, anchor: .bottom)
          .offset(y: offset)
          .opacity(index >= manager.limit ? 0 : 1)
          .allowsHitTesting(index < manager.limit)
          .zIndex(Double(-index))
          .transition(reduceMotion ? .opacity : .move(edge: .bottom).combined(with: .opacity))
        }
      }
      .padding(.horizontal, inset)
      .padding(.bottom, 16)
      .frame(width: proxy.size.width, height: proxy.size.height, alignment: .bottom)
    }
    .frame(height: stackHeight(ordered: ordered, front: front))
    .animation(reduceMotion ? .linear(duration: 0.2) : .smooth(duration: 0.45), value: manager.toasts.map(\.id))
    .animation(reduceMotion ? .linear(duration: 0.2) : .smooth(duration: 0.45), value: expanded)
    .contentShape(Rectangle())
    .onTapGesture {
      if ordered.count > 1 { expanded.toggle() }
    }
    .onChange(of: manager.toasts.count) { _, count in
      if count < 2 { expanded = false }
    }
  }

  private func stackHeight(ordered: [ToastItem], front: CGFloat) -> CGFloat {
    guard !ordered.isEmpty else { return 0 }
    let shown = ordered.prefix(manager.limit)
    if expanded {
      return shown.reduce(0) { $0 + (heights[$1.id] ?? 0) } + CGFloat(shown.count - 1) * 12 + 16
    }
    return front + CGFloat(shown.count - 1) * 12 + 16
  }
}

struct ToastCard: View {
  let item: ToastItem
  var behind = false
  let onDismiss: () -> Void

  @State private var drag: CGFloat = 0
  @Environment(\.colorScheme) private var colorScheme

  var body: some View {
    let shape = RoundedRectangle(cornerRadius: Radius.xl, style: .continuous)
    let dark = colorScheme == .dark
    HStack(spacing: 12) {
      ToastIcon(type: item.type)
      VStack(alignment: .leading, spacing: 4) {
        Text(item.title)
          .font(TextStyle.sm.font(weight: .semibold))
          .tracking(TextStyle.sm.letterSpacing)
          .foregroundStyle(Color.label)
        if let description = item.description {
          Text(description)
            .font(TextStyle.sm.font())
            .tracking(TextStyle.sm.letterSpacing)
            .foregroundStyle(Color.labelSecondary)
        }
      }
      .fixedSize(horizontal: false, vertical: true)
      .frame(maxWidth: .infinity, alignment: .leading)
      if let action = item.action {
        Button {
          action.action()
          onDismiss()
        } label: {
          Text(action.title)
        }
        .buttonStyle(.variant(.outline, size: .sm))
      }
      Button(action: onDismiss) {
        Ph.x.regular
          .frame(width: 16, height: 16)
          .foregroundStyle(Color.labelSecondary)
      }
      .buttonStyle(.variant(.ghost, size: .iconSm))
      .accessibilityLabel(Text("Close toast"))
    }
    .padding(16)
    .opacity(behind ? 0 : 1)
    .frame(maxWidth: .infinity)
    .background {
      shape
        .fill(Color.surfaceRaised)
        .shadow(dark ? .lg : Shadow(color: .black.opacity(0.14), radius: 16, y: 8))
    }
    .overlay {
      if !dark { shape.strokeBorder(Color.label.opacity(0.05)) }
    }
    .offset(y: drag)
    .gesture(
      DragGesture(minimumDistance: 8)
        .onChanged { value in
          drag = max(0, value.translation.height)
        }
        .onEnded { value in
          if drag > 48 || value.predictedEndTranslation.height > 160 {
            onDismiss()
          } else {
            withAnimation(.spring(duration: 0.3)) { drag = 0 }
          }
        }
    )
    .accessibilityElement(children: .contain)
    .accessibilityHidden(behind)
    .accessibilityAction(.escape, onDismiss)
  }
}

private struct ToastIcon: View {
  let type: ToastType

  var body: some View {
    switch type {
    case .default:
      EmptyView()
    case .loading:
      ProgressView()
        .tint(Color.accent)
        .frame(width: 32, height: 32)
        .accessibilityHidden(true)
    case .success, .info, .warning, .error:
      icon
        .frame(width: 16, height: 16)
        .rotationEffect(.degrees(type == .info ? 180 : 0))
        .foregroundStyle(Color.surface)
        .frame(width: 32, height: 32)
        .background(tint, in: Circle())
        .accessibilityHidden(true)
    }
  }

  private var icon: Image {
    switch type {
    case .success: Ph.check.bold
    case .error: Ph.x.bold
    default: Ph.exclamationMark.bold
    }
  }

  private var tint: Color {
    switch type {
    case .success: .success
    case .info: .accent
    case .warning: .warning
    default: .danger
    }
  }
}
```

```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/Toast.kt"
package com.esuiss.ui.components

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.LinearEasing
import androidx.compose.animation.core.RepeatMode
import androidx.compose.animation.core.VectorConverter
import androidx.compose.animation.core.animateDpAsState
import androidx.compose.animation.core.animateFloat
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.infiniteRepeatable
import androidx.compose.animation.core.rememberInfiniteTransition
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.gestures.detectDragGestures
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.ime
import androidx.compose.foundation.layout.navigationBars
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.layout.wrapContentHeight
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.Immutable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.key
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableLongStateOf
import androidx.compose.runtime.mutableStateListOf
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
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.rotate
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.TransformOrigin
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.layout.onSizeChanged
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.platform.LocalWindowInfo
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.dismiss
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 androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.IntRect
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.dp
import androidx.compose.ui.zIndex
import androidx.compose.ui.window.Popup
import androidx.compose.ui.window.PopupPositionProvider
import androidx.compose.ui.window.PopupProperties
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Bold
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.bold.Check
import com.adamglin.phosphoricons.bold.ExclamationMark
import com.adamglin.phosphoricons.bold.X
import com.adamglin.phosphoricons.regular.CircleNotch
import com.adamglin.phosphoricons.regular.X
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Shadow
import com.esuiss.ui.theme.Shadows
import com.esuiss.ui.theme.Typography
import com.esuiss.ui.theme.shadow
import kotlin.math.abs
import kotlin.math.max
import kotlin.math.roundToInt
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

enum class ToastType { Default, Success, Info, Warning, Error, Loading }

@Immutable
class ToastAction(val label: String, val onClick: () -> Unit)

@Stable
class ToastData internal constructor(
    val id: Long,
    title: String,
    description: String?,
    type: ToastType,
    action: ToastAction?,
    durationMillis: Long,
) {
    var title by mutableStateOf(title)
        internal set
    var description by mutableStateOf(description)
        internal set
    var type by mutableStateOf(type)
        internal set
    var action by mutableStateOf(action)
        internal set
    var durationMillis by mutableLongStateOf(durationMillis)
        internal set
    internal var dismissed by mutableStateOf(false)
}

@Stable
class ToastState(
    val limit: Int = 3,
    val defaultDurationMillis: Long = 5000,
) {
    private val items = mutableStateListOf<ToastData>()
    private var nextId = 0L

    val toasts: List<ToastData>
        get() = items

    fun show(
        title: String,
        description: String? = null,
        type: ToastType = ToastType.Default,
        action: ToastAction? = null,
        durationMillis: Long = if (type == ToastType.Loading) 0 else defaultDurationMillis,
    ): Long {
        nextId += 1
        items.add(0, ToastData(nextId, title, description, type, action, durationMillis))
        return nextId
    }

    fun success(title: String, description: String? = null, action: ToastAction? = null): Long =
        show(title, description, ToastType.Success, action)

    fun info(title: String, description: String? = null, action: ToastAction? = null): Long =
        show(title, description, ToastType.Info, action)

    fun warning(title: String, description: String? = null, action: ToastAction? = null): Long =
        show(title, description, ToastType.Warning, action)

    fun error(title: String, description: String? = null, action: ToastAction? = null): Long =
        show(title, description, ToastType.Error, action)

    fun loading(title: String, description: String? = null): Long =
        show(title, description, ToastType.Loading)

    fun update(
        id: Long,
        title: String? = null,
        description: String? = null,
        type: ToastType? = null,
        action: ToastAction? = null,
        durationMillis: Long? = null,
    ) {
        val toast = items.firstOrNull { it.id == id } ?: return
        if (title != null) toast.title = title
        if (description != null) toast.description = description
        if (action != null) toast.action = action
        if (type != null) {
            toast.type = type
            if (durationMillis == null && type != ToastType.Loading && toast.durationMillis == 0L) {
                toast.durationMillis = defaultDurationMillis
            }
        }
        if (durationMillis != null) toast.durationMillis = durationMillis
    }

    fun dismiss(id: Long) {
        items.firstOrNull { it.id == id }?.dismissed = true
    }

    fun dismissAll() {
        items.forEach { it.dismissed = true }
    }

    internal fun remove(id: Long) {
        items.removeAll { it.id == id }
    }
}

@Composable
fun rememberToastState(limit: Int = 3, defaultDurationMillis: Long = 5000): ToastState =
    remember { ToastState(limit, defaultDurationMillis) }

private val ToastGap = 12.dp

private val ToastPeek = 12.dp

private val ToastMaxWidth = 384.dp

private val ToastShadow = Shadow(0.dp, 8.dp, 32.dp, Color.Black.copy(alpha = 0.14f))

private class ToasterPositionProvider(private val bottomLimit: Int) : PopupPositionProvider {
    override fun calculatePosition(
        anchorBounds: IntRect,
        windowSize: IntSize,
        layoutDirection: LayoutDirection,
        popupContentSize: IntSize,
    ): IntOffset {
        val bottom = minOf(anchorBounds.bottom, bottomLimit)
        val x = anchorBounds.left + (anchorBounds.width - popupContentSize.width) / 2
        return IntOffset(x, bottom - popupContentSize.height)
    }
}

@Composable
fun Toaster(
    state: ToastState,
    modifier: Modifier = Modifier,
    content: @Composable () -> Unit = {},
) {
    val density = LocalDensity.current
    var anchorWidth by remember { mutableIntStateOf(0) }
    Box(modifier = modifier.onSizeChanged { anchorWidth = it.width }) {
        content()
        if (state.toasts.isNotEmpty() && anchorWidth > 0) {
            val containerHeight = LocalWindowInfo.current.containerSize.height
            val covered = max(WindowInsets.navigationBars.getBottom(density), WindowInsets.ime.getBottom(density))
            val bottomLimit = if (containerHeight > 0) containerHeight - covered else Int.MAX_VALUE
            val provider = remember(bottomLimit) { ToasterPositionProvider(bottomLimit) }
            val available = with(density) { anchorWidth.toDp() } - 32.dp
            val width = if (available < ToastMaxWidth) available else ToastMaxWidth
            Popup(
                popupPositionProvider = provider,
                properties = PopupProperties(
                    focusable = false,
                    dismissOnBackPress = false,
                    dismissOnClickOutside = false,
                ),
            ) {
                ToastStack(state, width)
            }
        }
    }
}

@Composable
private fun ToastStack(state: ToastState, width: Dp) {
    val density = LocalDensity.current
    val heights = remember { mutableStateMapOf<Long, Int>() }
    var expanded by remember { mutableStateOf(false) }
    val active = state.toasts.filter { !it.dismissed }
    if (active.size <= 1 && expanded) expanded = false
    val visible = active.take(state.limit)
    val gap = with(density) { ToastGap.roundToPx() }
    val peek = with(density) { ToastPeek.roundToPx() }
    val front = visible.firstOrNull()?.let { heights[it.id] } ?: 0
    val target = when {
        visible.isEmpty() -> 0
        expanded -> visible.sumOf { heights[it.id] ?: 0 } + gap * (visible.size - 1)
        else -> front + peek * (visible.size - 1)
    }
    val targetDp = with(density) { target.toDp() }
    val animated by animateDpAsState(targetDp, tween(450), label = "stack")
    val stackHeight = if (animated > targetDp) animated else targetDp

    Box(
        modifier = Modifier
            .width(width + 32.dp)
            .padding(start = 16.dp, end = 16.dp, top = 24.dp, bottom = 16.dp)
            .height(stackHeight),
        contentAlignment = Alignment.BottomCenter,
    ) {
        state.toasts.forEach { toast ->
            val index = active.indexOf(toast).let { if (it < 0) 0 else it }
            val offsetY = active.take(index).sumOf { heights[it.id] ?: 0 }
            key(toast.id) {
                ToastItem(
                    toast = toast,
                    index = index,
                    expanded = expanded,
                    frontHeight = front,
                    offsetY = offsetY,
                    hidden = index >= state.limit,
                    gap = gap,
                    peek = peek,
                    onHeight = { heights[toast.id] = it },
                    onDismiss = { state.dismiss(toast.id) },
                    onRemoved = {
                        heights.remove(toast.id)
                        state.remove(toast.id)
                    },
                    onToggle = { if (active.size > 1) expanded = !expanded },
                )
            }
        }
    }
}

@Composable
private fun ToastItem(
    toast: ToastData,
    index: Int,
    expanded: Boolean,
    frontHeight: Int,
    offsetY: Int,
    hidden: Boolean,
    gap: Int,
    peek: Int,
    onHeight: (Int) -> Unit,
    onDismiss: () -> Unit,
    onRemoved: () -> Unit,
    onToggle: () -> Unit,
) {
    val colors = EsuissTheme.colors
    val density = LocalDensity.current
    val scope = rememberCoroutineScope()
    var natural by remember { mutableIntStateOf(0) }
    val scale = if (expanded) 1f else max(0f, 1f - index * 0.1f)
    val translate = if (expanded) {
        -(offsetY + index * gap).toFloat()
    } else {
        -(index * peek).toFloat() - (1f - scale) * frontHeight
    }
    val spec = tween<Float>(450)
    val animatedTranslate by animateFloatAsState(translate, spec, label = "translate")
    val animatedScale by animateFloatAsState(scale, spec, label = "scale")
    val animatedAlpha by animateFloatAsState(if (hidden) 0f else 1f, spec, label = "alpha")
    val behind = !expanded && index > 0
    val contentAlpha by animateFloatAsState(if (behind) 0f else 1f, tween(250), label = "content")
    val enter = remember { Animatable(1f) }
    val exit = remember { Animatable(0f) }
    val drag = remember { Animatable(Offset.Zero, Offset.VectorConverter) }

    LaunchedEffect(Unit) {
        enter.animateTo(0f, tween(450))
    }
    LaunchedEffect(toast.dismissed) {
        if (toast.dismissed) {
            exit.animateTo(1f, tween(250))
            onRemoved()
        }
    }
    LaunchedEffect(toast.id, toast.type, toast.durationMillis, expanded, toast.dismissed) {
        if (!toast.dismissed && !expanded && toast.type != ToastType.Loading && toast.durationMillis > 0) {
            delay(toast.durationMillis)
            onDismiss()
        }
    }

    val forced = behind && frontHeight > 0
    val shape = RoundedCornerShape(Radius.xl)
    val liveMode = if (toast.type == ToastType.Error) LiveRegionMode.Assertive else LiveRegionMode.Polite
    val slideDistance = with(density) { 16.dp.toPx() }
    Box(
        modifier = Modifier
            .zIndex(1000f - index)
            .fillMaxWidth()
            .graphicsLayer {
                val height = if (natural > 0) natural.toFloat() else size.height
                translationY = animatedTranslate + enter.value * (height + slideDistance) +
                    exit.value * slideDistance + drag.value.y
                translationX = drag.value.x
                scaleX = animatedScale
                scaleY = animatedScale
                transformOrigin = TransformOrigin(0.5f, 1f)
                alpha = animatedAlpha * (1f - exit.value)
            }
            .then(if (forced) Modifier.height(with(density) { frontHeight.toDp() }) else Modifier)
            .then(if (colors.isDark) Modifier.shadow(Shadows.lg, shape) else Modifier.shadow(ToastShadow, shape))
            .clip(shape)
            .background(colors.surfaceRaised, shape)
            .border(1.dp, if (colors.isDark) Color.Transparent else colors.label.copy(alpha = 0.05f), shape)
            .semantics {
                liveRegion = liveMode
                dismiss {
                    onDismiss()
                    true
                }
            }
            .pointerInput(toast.id) {
                detectTapGestures { onToggle() }
            }
            .pointerInput(toast.id) {
                val threshold = 48.dp.toPx()
                detectDragGestures(
                    onDragEnd = {
                        val value = drag.value
                        if (abs(value.x) > threshold * 2 || value.y > threshold) {
                            onDismiss()
                        } else {
                            scope.launch { drag.animateTo(Offset.Zero, tween(200)) }
                        }
                    },
                    onDragCancel = { scope.launch { drag.animateTo(Offset.Zero, tween(200)) } },
                ) { change, amount ->
                    change.consume()
                    val next = drag.value + amount
                    scope.launch { drag.snapTo(Offset(next.x, max(next.y, -8.dp.toPx()))) }
                }
            },
    ) {
        Row(
            modifier = Modifier
                .fillMaxWidth()
                .wrapContentHeight(Alignment.Top, unbounded = true)
                .onSizeChanged {
                    natural = it.height
                    onHeight(it.height)
                }
                .graphicsLayer { alpha = contentAlpha }
                .padding(16.dp),
            horizontalArrangement = Arrangement.spacedBy(12.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            ToastIcon(toast.type)
            Column(modifier = Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(4.dp)) {
                BasicText(toast.title, style = Typography.sm.copy(color = colors.label, fontWeight = FontWeight.SemiBold))
                toast.description?.let {
                    BasicText(it, style = Typography.sm.copy(color = colors.labelSecondary))
                }
            }
            toast.action?.let { action ->
                Button(
                    text = action.label,
                    onClick = {
                        action.onClick()
                        onDismiss()
                    },
                    variant = ButtonVariant.Outline,
                    size = ButtonSize.Sm,
                )
            }
            Button(onClick = onDismiss, variant = ButtonVariant.Ghost, size = ButtonSize.IconSm) {
                Icon(PhosphorIcons.Regular.X, contentDescription = "Close toast", size = 16.dp, tint = colors.labelSecondary)
            }
        }
    }
}

@Composable
private fun ToastIcon(type: ToastType) {
    val colors = EsuissTheme.colors
    if (type == ToastType.Loading) {
        val transition = rememberInfiniteTransition(label = "spinner")
        val rotation by transition.animateFloat(
            initialValue = 0f,
            targetValue = 360f,
            animationSpec = infiniteRepeatable(tween(800, easing = LinearEasing), RepeatMode.Restart),
            label = "rotation",
        )
        Box(modifier = Modifier.size(32.dp).clearAndSetSemantics {}, contentAlignment = Alignment.Center) {
            Icon(PhosphorIcons.Regular.CircleNotch, contentDescription = null, modifier = Modifier.rotate(rotation), size = 20.dp, tint = colors.accent)
        }
        return
    }
    val tint = when (type) {
        ToastType.Success -> colors.green
        ToastType.Info -> colors.accent
        ToastType.Warning -> colors.orange
        ToastType.Error -> colors.danger
        else -> return
    }
    val icon = when (type) {
        ToastType.Success -> PhosphorIcons.Bold.Check
        ToastType.Error -> PhosphorIcons.Bold.X
        else -> PhosphorIcons.Bold.ExclamationMark
    }
    Box(
        modifier = Modifier
            .size(32.dp)
            .background(tint, CircleShape)
            .clearAndSetSemantics {},
        contentAlignment = Alignment.Center,
    ) {
        Icon(
            icon,
            contentDescription = null,
            modifier = if (type == ToastType.Info) Modifier.rotate(180f) else Modifier,
            size = 16.dp,
            tint = colors.surface,
        )
    }
}
```

```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/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/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),
    )
}
```

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

## Usage

```tsx
import { ToastProvider, ToastPortal, ToastViewport, Toast, ToastContent, ToastTitle, ToastDescription, ToastAction, ToastClose, Toaster } from "@/components/ui/toast"
```

```tsx
<Toaster>
  <Examples />
</Toaster>
```

Render `Toaster` once near the root, then call the exported `toast` manager from anywhere: `toast.add({ title, description, type })` returns an id, `toast.update(id, updates)` changes a toast, and `toast.close(id)` removes it (or all toasts when called without an id).

`toast.promise(promise, { loading, success, error })` shows a loading toast and replaces it with the success or error state when the promise settles.

Pass `actionProps` (for example `{ children: "Undo", onPress }`) to show an action button. Set `priority: "high"` for urgent messages and `timeout` to override the provider default; `loading` toasts stay until updated.

Use `createToastManager` to create a separate manager and pass it to `Toaster` as `toastManager`, and `useToastManager` to read the current toasts and actions inside the provider. The lower-level parts are exported for building a custom toast layout.

## Examples

### Show on load

Shows a success toast as soon as the screen mounts.

![Preview](https://uim.suiss.app/previews/components-toast--show-on-load.light.webp)

```tsx
import * as React from "react"
import { View } from "react-native"
import { Button } from "@/components/ui/button"
import { Text } from "@/components/ui/text"
import { Toaster, toast } from "@/components/ui/toast"

function wait(ms: number) {
  return new Promise<void>((resolve) => setTimeout(resolve, ms))
}

function ShowOnMount() {
  React.useEffect(() => {
    const id = toast.add({
      title: "Event created",
      description: "Sunday, December 3 at 9:00 AM",
      type: "success",
    })
    return () => toast.close(id)
  }, [])
  return null
}

function Examples() {
  return (
    <View className="items-start gap-3">
      <Button
        variant="outline"
        onPress={() =>
          toast.add({
            title: "Event created",
            description: "Sunday, December 3 at 9:00 AM",
          })
        }
      >
        <Text>Show toast</Text>
      </Button>
      <Button
        variant="outline"
        onPress={() =>
          toast.add({
            title: "Message archived",
            type: "info",
            actionProps: {
              children: "Undo",
              onPress: () => toast.add({ title: "Restored", type: "success" }),
            },
          })
        }
      >
        <Text>With action</Text>
      </Button>
      <Button
        variant="outline"
        onPress={() =>
          toast.add({
            title: "Storage almost full",
            description: "Free up space to keep syncing.",
            type: "warning",
          })
        }
      >
        <Text>Warning</Text>
      </Button>
      <Button
        variant="outline"
        onPress={() =>
          toast.add({
            title: "Upload failed",
            description: "Check your connection and try again.",
            type: "error",
            priority: "high",
          })
        }
      >
        <Text>Error</Text>
      </Button>
      <Button
        variant="outline"
        onPress={() => {
          toast
            .promise(wait(2000), {
              loading: "Saving changes",
              success: "Changes saved",
              error: "Could not save changes",
            })
            .catch(() => undefined)
        }}
      >
        <Text>Promise</Text>
      </Button>
    </View>
  )
}

export function ToastShowOnLoadExample() {
  return (
    <Toaster>
      <ShowOnMount />
      <Examples />
    </Toaster>
  )
}
```

## API Reference

### ToastProvider

Holds the toast queue, default timeout and visible limit.

### ToastPortal

Renders its children into a portal host.

### ToastViewport

Full-screen layer that holds the stack and expands it on touch.

### Toast

One animated, swipeable toast in the stack.

### ToastContent

Row layout for the icon, text, action and close button.

### ToastTitle

The toast title, read from the toast object.

### ToastDescription

Secondary text under the title.

### ToastAction

Outline button rendered from `actionProps`.

### ToastClose

Icon button that dismisses the toast.

### Toaster

Provider, portal and viewport that render the default toast list.

## Accessibility

- Each toast has the `alert` role and a live region that is `polite`, or `assertive` for `priority: "high"`.
- New toasts are announced with their title and description; high-priority announcements are not queued.
- A `dismiss` accessibility action and the escape gesture close the toast.
- Toasts stacked behind the front one are hidden from VoiceOver and TalkBack.
- The close button has the label "Close toast" and the type icon is hidden from assistive technology.
- Animations respect the system reduce motion setting.

## Notes

- Uses `bg-surface-raised`, `text-label`, `text-label-secondary` and tint tokens `bg-green`, `bg-accent`, `bg-orange` and `bg-danger` for the icons.
- Light and dark colors follow the system appearance; dark mode drops the border.
- Toasts respect the bottom safe area inset.
- `FullWindowOverlay` is used on iOS only; Android renders the viewport directly.