# Slider (Notchset): prompt.md (v1.0.0)

- id: `slider` · version 1.0.0 · component · free
- category: Inputs
- build: Base UI (this item also ships a Radix build)
- install (this build): `npx shadcn@latest add https://beautiful-ui.dev/r/slider.json`
- npm dependencies: @base-ui/react@^1
- registry dependencies: utils, https://beautiful-ui.dev/r/notchset-foundation.json
- docs: https://beautiful-ui.dev/components/slider
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

shadcn's Slider in Notchset: a 1px rail, a 2px ink fill and 12×22 ink thumbs whose value tags rise on hover, focus or drag; clicks glide, drags follow and squash; optional ticks and marks.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: `@base-ui/react@^1` (Base UI build); `radix-ui@^1` (Radix build).
- Files: `components/ui/notchset/slider.tsx`; shared code: `lib/beautiful-ui/notchset/slider.tsx`, `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `notchset-foundation`.
- Builds: separate Base UI and Radix files. Install the one that matches the project (see Install): a free item's bare URL installs the Base UI build of it and its dependencies.
- Exports to keep: `Slider`, and every exported type.
- CSS: the install adds the notchset foundation (tokens, keyframes, motion levels) to your global stylesheet once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Tokens: retheme with the `--notchset-*` custom properties (`--notchset-check`, `--notchset-control-edge`, `--notchset-draw-from`, `--notchset-ease-bloom`, `--notchset-ease-travel`, `--notchset-fade`, `--notchset-focus-color`, `--notchset-focus-inset`, `--notchset-life-from`, `--notchset-life-ms`, `--notchset-node-blink`, `--notchset-node-bloom`, `--notchset-node-delay`, `--notchset-plate-color`, `--notchset-rise-from`, `--notchset-rule`, `--notchset-scroll`, `--notchset-signal`, `--notchset-sweep-to`). Never add Tailwind colour classes inside the component.

```tsx
import { Slider } from "@/components/ui/notchset/slider";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `Slider` | `slider` | The root. |
| `—` | `slider-range` | The fill. |
| `—` | `slider-thumb` | A thumb. |

Style a part with `[data-slot="<slot>"]` selectors or its `className`; keep the attributes when editing.

## Sound
- Keep every `data-slot` and `data-sound` attribute: the sound layer reads them.
- Installing this item adds no audio. Nothing plays until the app mounts `SoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/notchset-sound.json`, import from `@/components/ui/notchset/sound-provider`); `useSound()` gives `muted` and `setMuted` for a mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/notchset/slider.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when
- slider, range slider, price range, temperature, volume, shadcn slider, Notchset
- A value or a band on a known scale, where seeing it matters more than typing it

### Not when
- Exact numbers: use Number Field

## Mistakes
- Label each thumb of a range

## Usage

```tsx
"use client";

import * as React from "react";
import { Slider } from "@/components/ui/notchset/slider";

const usd = (v: number) => `$${v.toLocaleString("en-US")}`;

export function BudgetBand() {
  const [band, setBand] = React.useState([2000, 7500]);
  return <Slider value={band} onValueChange={setBand} max={10000} step={250} format={usd} thumbLabels={["Min", "Max"]} />;
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `value / onValueChange` | `number[]` |  | One value or two (a range). |
| `min / max / step` | `number` |  | The scale. |
| `minStepsBetweenValues` | `number` |  | The narrowest range. |
| `format` | `(v) => string` |  | The tag's text. |
| `thumbLabels` | `string[]` |  | Each thumb's aria-label. |
| `ticks` | `{ every, major? }` |  | Ticks under the rail. |
| `marks` | `{ value, label }[]` |  | Labels under it. |

Full docs: https://beautiful-ui.dev/components/slider

## Customising
- Colours: the component reads your shadcn tokens (`--background`, `--foreground`, `--border` …), refined by the `--notchset-*` tokens. The signal colour is `--notchset-signal` (it falls back to `--destructive`). Set tokens on `:root`, or on any container to retheme one area.
- Dark mode follows the `.dark` class on an ancestor (the shadcn and next-themes convention).
- Update later by re-running the install with `--overwrite` (review the diff if you edited it). Changelog: https://beautiful-ui.dev/r/changelog.json

## Keyboard

| Keys | Action |
|---|---|
| ← → ↑ ↓ | Step |
| PgUp / PgDn | 4 steps (Base UI) or 10% (Radix) |
| Home / End | Min / max |

## Performance

- CSS transitions; no measuring.

## Responsive

- Fills its container.

## Motion inventory

| Interaction | What moves |
|---|---|
| Click | The thumb and fill glide (280ms settle) |
| Drag | The thumb squashes to 86% and follows exactly |
| Tag | Fades in (140ms) and rises 4px (260ms) on hover, focus or drag |

## Accessibility contract (preserve when editing)
- The Base UI or Radix slider: each thumb is a slider with its own label and value text
- RTL and form values from the primitive

## Install

Base UI project (a base-* style in components.json):

```bash
npx shadcn@latest add https://beautiful-ui.dev/r/slider.json
```

Radix project (a radix-*, new-york or default style):

```bash
npx shadcn@latest add https://beautiful-ui.dev/r/radix-nova/slider.json
```

Or add the `@beautiful-ui` registry to components.json and run `npx shadcn@latest add @beautiful-ui/slider`: the CLI picks the build from your style.

## Credits
- Built on shadcn/ui (https://ui.shadcn.com)

## Source (Base UI build)

### components/ui/notchset/slider.tsx

```tsx
"use client";

/**
 * Slider (Notchset) v1.0.0 · Beautiful UI, by Chimpy (https://x.com/stochastichimp)
 * Docs: https://beautiful-ui.dev/components/slider · Agent prompt: https://beautiful-ui.dev/md/slider.md
 * MIT licensed: free to use, change and share.
 */

import * as React from "react";
import { Slider as SliderPrimitive } from "@base-ui/react/slider";
import { cn } from "@/lib/utils";
import { NOTCHSET_ROOT, OWN_SOUND, playCue } from "@/lib/beautiful-ui/notchset/instrument";
import { SliderMarks, SliderThumbFace, SliderTicks, sliderControlClass, sliderFillClass, sliderRootClass, sliderThumbClass, sliderTrackClass } from "@/lib/beautiful-ui/notchset/slider";

/*
 * Notchset Slider (Base UI build). shadcn's Slider (one value or a range) in Notchset: a 1px rail, a
 * 2px ink fill and 12×22 ink thumbs whose value tags rise on hover, focus or drag. A click glides the
 * thumb; a drag tracks the pointer and squashes the thumb. Each step ticks. Ticks and marks are
 * optional. Base UI does the keyboard (arrows, Page keys ×4 steps, Home/End), RTL and form value.
 */

function Slider({
  className,
  value,
  defaultValue,
  onValueChange,
  min = 0,
  max = 100,
  step = 1,
  format = (v: number) => String(v),
  thumbLabels,
  ticks,
  marks,
  ...props
}: Omit<SliderPrimitive.Root.Props<number[]>, "value" | "defaultValue" | "onValueChange" | "format"> & {
  value?: number[];
  defaultValue?: number[];
  onValueChange?: (value: number[]) => void;
  /** The value tag's text. */
  format?: (value: number) => string;
  /** aria-label for each thumb (a range needs two). */
  thumbLabels?: readonly string[];
  ticks?: { every: number; major?: number };
  marks?: readonly { value: number; label: React.ReactNode }[];
}) {
  const [own, setOwn] = React.useState(defaultValue ?? [min]);
  const values = value ?? own;
  return (
    <SliderPrimitive.Root
      {...NOTCHSET_ROOT}
      data-slot="slider"
      className={cn(sliderRootClass, className)}
      value={values}
      min={min}
      max={max}
      step={step}
      largeStep={step * 4}
      onValueChange={(v, details) => {
        const next = Array.isArray(v) ? v : [v];
        if (next.some((x, i) => x !== values[i])) playCue((details.event?.target as Element | null) ?? null, "tick");
        setOwn(next);
        onValueChange?.(next);
      }}
      {...props}
    >
      <SliderPrimitive.Control data-slot="slider-control" className={sliderControlClass}>
        <SliderPrimitive.Track data-slot="slider-track" className={sliderTrackClass}>
          <SliderPrimitive.Indicator data-slot="slider-range" className={sliderFillClass} />
          {ticks && <SliderTicks min={min} max={max} every={ticks.every} major={ticks.major} values={values} />}
          {values.map((v, i) => (
            <SliderPrimitive.Thumb {...OWN_SOUND} key={i} index={i} aria-label={thumbLabels?.[i]} getAriaValueText={() => format(v)} data-slot="slider-thumb" className={sliderThumbClass}>
              <SliderThumbFace label={format(v)} />
            </SliderPrimitive.Thumb>
          ))}
        </SliderPrimitive.Track>
      </SliderPrimitive.Control>
      {marks && <SliderMarks min={min} max={max} marks={marks} values={values} />}
    </SliderPrimitive.Root>
  );
}

export { Slider };
```

### lib/beautiful-ui/notchset/slider.tsx

```tsx
"use client";

import * as React from "react";
import { cn } from "@/lib/utils";

/*
 * Notchset Slider parts, shared by both builds (handoff 1.12). A 32px control on a 1px edge rail, a
 * 2px ink fill, and 12×22 ink thumbs with a hairline down their middle. A thumb squashes to 86% while
 * dragged; its value tag rises 4px and fades in above it on hover, focus or drag. A click glides the
 * thumb (280ms settle); a drag follows the pointer exactly. Optional ticks under the rail and marks
 * below, both inked inside the filled range.
 */

export const sliderRootClass = "group/slider relative flex w-full touch-none flex-col gap-0 select-none data-[disabled]:opacity-50";
export const sliderControlClass = "relative h-8 w-full cursor-pointer data-[disabled]:cursor-not-allowed";
export const sliderTrackClass = "absolute inset-x-0 top-[15.5px] h-px bg-[var(--notchset-control-edge,var(--input))]";
export const sliderFillClass = cn(
  "absolute top-[-0.5px] h-[2px] bg-foreground",
  "[transition:inset-inline-start_280ms_cubic-bezier(.34,1.3,.5,1),width_280ms_cubic-bezier(.34,1.3,.5,1),left_280ms_cubic-bezier(.34,1.3,.5,1),right_280ms_cubic-bezier(.34,1.3,.5,1)] group-data-[dragging]/slider:[transition:none] motion-reduce:[transition:none]",
);
export const sliderThumbClass = cn(`notchset-focus`, "[--notchset-focus-inset:-5px]",
  "group/thumb z-[2] block h-[22px] w-3 cursor-grab bg-foreground outline-none",
  "[transition:inset-inline-start_280ms_cubic-bezier(.34,1.3,.5,1),scale_160ms_cubic-bezier(.34,1.9,.5,1)] group-data-[dragging]/slider:cursor-grabbing group-data-[dragging]/slider:[transition:scale_140ms_cubic-bezier(.34,1.9,.5,1)] data-[dragging]:scale-y-[.86] motion-reduce:[transition:none]",
  "data-[disabled]:cursor-not-allowed",
);
/** Radix wraps each thumb in a positioned span: it carries the glide there. */
export const radixThumbGlide =
  "[&_span:has(>[role=slider])]:[transition:left_280ms_cubic-bezier(.34,1.3,.5,1)] data-[dragging]:[&_span:has(>[role=slider])]:[transition:none] motion-reduce:[&_span:has(>[role=slider])]:[transition:none]";

/** The hairline and the value tag inside a thumb. */
export function SliderThumbFace({ label, show }: { label: React.ReactNode; show?: boolean }) {
  return (
    <>
      <span aria-hidden className="absolute start-[5.5px] top-1.5 bottom-1.5 w-px bg-background" />
      <span
        aria-hidden
        data-show={show || undefined}
        className={cn(
          "pointer-events-none absolute start-1/2 bottom-[calc(100%+8px)] flex h-5 items-center border border-solid border-foreground bg-background px-1.5 font-mono text-[9px] font-medium tracking-[0.02em] whitespace-nowrap text-foreground tabular-nums",
          "translate-x-[-50%] translate-y-1 opacity-0 [transition:opacity_140ms_linear,translate_260ms_cubic-bezier(.34,1.3,.5,1)] rtl:translate-x-[50%]",
          "group-hover/thumb:translate-y-0 group-hover/thumb:opacity-100 group-has-[:focus-visible]/thumb:translate-y-0 group-has-[:focus-visible]/thumb:opacity-100 group-focus-visible/thumb:translate-y-0 group-focus-visible/thumb:opacity-100 group-data-[dragging]/slider:translate-y-0 group-data-[dragging]/slider:opacity-100 data-[show]:translate-y-0 data-[show]:opacity-100",
          "motion-reduce:translate-y-0",
        )}
      >
        {label}
      </span>
    </>
  );
}

const within = (v: number, values: readonly number[]) => (values.length > 1 ? v >= Math.min(...values) && v <= Math.max(...values) : v <= (values[0] ?? 0));

/** Ticks under the rail, every `every`; majors (every `major`) are taller. Inked inside the fill. */
export function SliderTicks({ min, max, every, major, values }: { min: number; max: number; every: number; major?: number; values: readonly number[] }) {
  const n = Math.floor((max - min) / every);
  return (
    <svg aria-hidden width="100%" height="10" className="pointer-events-none absolute start-0 top-[4.5px] overflow-visible">
      {Array.from({ length: n + 1 }, (_, i) => {
        const v = min + i * every;
        const p = `${((v - min) / (max - min)) * 100}%`;
        return (
          <line
            key={i}
            x1={p}
            x2={p}
            y1={major && Math.abs((v - min) % major) < 1e-9 ? 2 : 6}
            y2="10"
            strokeWidth="1"
            className={cn("transition-[stroke] duration-[160ms] ease-linear", within(v, values) ? "stroke-foreground" : "stroke-[var(--notchset-control-edge,var(--input))]")}
          />
        );
      })}
    </svg>
  );
}

/** Labels under the control at given values; inked inside the fill. */
export function SliderMarks({ min, max, marks, values }: { min: number; max: number; marks: readonly { value: number; label: React.ReactNode }[]; values: readonly number[] }) {
  return (
    <div aria-hidden className="relative h-3">
      {marks.map((m) => {
        const p = ((m.value - min) / (max - min)) * 100;
        return (
          <span
            key={m.value}
            className={cn("absolute top-0 font-mono text-[8px] tracking-[0.04em] whitespace-nowrap transition-[color] duration-[160ms] ease-linear", within(m.value, values) ? "text-foreground" : "text-muted-foreground")}
            style={{ insetInlineStart: `${p}%`, translate: p <= 0 ? "0" : p >= 100 ? "-100%" : "-50%" }}
          >
            {m.label}
          </span>
        );
      })}
    </div>
  );
}
```

### lib/beautiful-ui/notchset/instrument.tsx

```tsx
"use client";

import * as React from "react";
import { cn } from "@/lib/utils";

/*
 * Notchset instrument parts, shared by every member of a pack: the node (a round light that reports
 * state), the legend printed above a control, the plate a key presses onto, the traced check, the
 * five-tick scanner, and the glyph flip that lands a changed label left to right. Nodes and checks
 * are inline SVG (round at every DPR); the CSS lives in the Notchset foundation. Also: the one motion
 * policy (reduced motion or a data-motion="off" ancestor), ref composition, the portal container
 * and the sound attributes every Notchset root carries.
 */

// ---------------------------------------------------------------------------------------------
// Motion, refs, portals, sound
// ---------------------------------------------------------------------------------------------

/** True under prefers-reduced-motion or inside a data-motion="off" scope. Checked when an effect runs. */
/**
 * Whether motion is off for an element, kept live: it follows the OS reduced-motion setting and any
 * data-motion attribute change above it, so a preference switched mid-playback stops decoration at once.
 */
export function useMotionOff(ref: React.RefObject<Element | null>) {
  const [off, setOff] = React.useState(false);
  React.useEffect(() => {
    const read = () => setOff(motionOff(ref.current));
    const r = requestAnimationFrame(read);
    const mq = window.matchMedia?.("(prefers-reduced-motion: reduce)");
    mq?.addEventListener?.("change", read);
    const mo = new MutationObserver(read);
    mo.observe(document.documentElement, { attributes: true, attributeFilter: ["data-motion"], subtree: true });
    return () => {
      cancelAnimationFrame(r);
      mq?.removeEventListener?.("change", read);
      mo.disconnect();
    };
  }, [ref]);
  return off;
}

/**
 * The microphone, or a rejection after `timeoutMs` (a prompt left open, a denied permission). A stream
 * that arrives after the timeout is stopped at once, so a late "Allow" never leaves the mic on.
 */
export function requestMic(timeoutMs = 5000): Promise<MediaStream> {
  if (typeof navigator === "undefined" || !navigator.mediaDevices?.getUserMedia) return Promise.reject(new Error("no mic"));
  const ask = navigator.mediaDevices.getUserMedia({ audio: true });
  return new Promise((resolve, reject) => {
    let late = false;
    const t = setTimeout(() => {
      late = true;
      reject(new Error("timeout"));
    }, timeoutMs);
    ask.then(
      (stream) => {
        clearTimeout(t);
        if (late) stream.getTracks().forEach((track) => track.stop());
        else resolve(stream);
      },
      (err) => {
        clearTimeout(t);
        reject(err);
      },
    );
  });
}

export function motionOff(el: Element | null | undefined) {
  if (typeof window === "undefined") return true;
  if (window.matchMedia?.("(prefers-reduced-motion: reduce)").matches) return true;
  return Boolean(el?.closest('[data-motion="off"]'));
}

function assignRef<T>(ref: React.Ref<T> | undefined, node: T | null): () => void {
  if (typeof ref === "function") {
    const cleanup = ref(node);
    return typeof cleanup === "function" ? cleanup : () => ref(null);
  }
  if (ref) (ref as React.RefObject<T | null>).current = node;
  return () => {
    if (ref) (ref as React.RefObject<T | null>).current = null;
  };
}

/** Composes two refs, keeping React 19 ref cleanups. */
export function useComposedRefs<T>(a: React.Ref<T> | undefined, b: React.Ref<T> | undefined): React.RefCallback<T> {
  return React.useCallback(
    (node: T | null) => {
      const release = [assignRef(a, node), assignRef(b, node)];
      return () => release.forEach((f) => f());
    },
    [a, b],
  );
}

/** Runs ours after theirs, unless theirs called preventDefault. */
export function composeHandler<E extends { defaultPrevented: boolean }>(theirs: ((e: E) => void) | undefined, ours: (e: E) => void) {
  return (e: E) => {
    theirs?.(e);
    if (!e.defaultPrevented) ours(e);
  };
}

/** Keeps the latest value in a ref, for callbacks read inside timers and animation frames. */
export function useLatest<T>(value: T) {
  const ref = React.useRef(value);
  React.useLayoutEffect(() => {
    ref.current = value;
  });
  return ref;
}

/*
 * Where Notchset overlays (menus, popovers, tooltips) portal to. Unset, document.body, as shadcn's
 * do. Provide an element to keep them inside a scoped theme: a preview, a widget, a shadow root.
 */
export const NotchsetPortalContext = React.createContext<HTMLElement | null>(null);
export function useNotchsetPortal(): HTMLElement | undefined {
  return React.useContext(NotchsetPortalContext) ?? undefined;
}

export { NOTCHSET_ROOT, OWN_SOUND } from "@/lib/beautiful-ui/notchset/root";

// ---------------------------------------------------------------------------------------------
// Parts
// ---------------------------------------------------------------------------------------------

export type NodeState = "off" | "on" | "live" | "signal";

/** The node: a 9×9 ring whose dot blooms on (`on`), blinks (`live`) or turns signal. */
function Node({ state = "off", delay, className, style, ...props }: Omit<React.ComponentProps<"svg">, "children"> & { state?: NodeState; delay?: number }) {
  return (
    <svg
      aria-hidden
      data-slot="indicator"
      data-state={state}
      width="9"
      height="9"
      viewBox="0 0 9 9"
      className={cn(`notchset-node`, className)}
      style={delay ? ({ "--notchset-node-delay": `${delay}ms`, ...style } as React.CSSProperties) : style}
      {...props}
    >
      <circle data-slot="indicator-ring" cx="4.5" cy="4.5" r="3.25" fill="none" strokeWidth="1" />
      <circle data-slot="indicator-dot" cx="4.5" cy="4.5" />
    </svg>
  );
}

/** A small solid round mark (the node where a leader meets a popup, a pointer): SVG, round at every DPR. */
function Dot({ size = 7, className, style }: { size?: number; className?: string; style?: React.CSSProperties }) {
  return (
    <svg aria-hidden width={size} height={size} viewBox={`0 0 ${size} ${size}`} className={cn("pointer-events-none absolute overflow-visible", className)} style={style}>
      <circle cx={size / 2} cy={size / 2} r={size / 2} fill="currentColor" />
    </svg>
  );
}

/** The legend: a mono label above a control, with an optional node (or any trailing reading). */
function Legend({ label, node, children, className, ...props }: React.ComponentProps<"div"> & { label?: React.ReactNode; node?: NodeState }) {
  return (
    <div data-slot="legend" className={cn(`notchset-legend`, className)} {...props}>
      <span data-slot="legend-label">{label}</span>
      {(children != null || node) && (
        <span data-slot="legend-reading" className="flex items-center gap-2">
          {children}
          {node && <Node state={node} />}
        </span>
      )}
    </div>
  );
}

/** A key on its plate: the plate is an offset frame behind the child; `--notchset-plate-color` tints it. */
function Plated({ className, children, ...props }: React.ComponentProps<"span">) {
  return (
    <span data-slot="plated" className={cn("relative inline-flex", className)} {...props}>
      <span aria-hidden data-slot="plate" className={`notchset-plate`} />
      {children}
    </span>
  );
}

/**
 * The success check. Mounted, it traces itself in over --notchset-check (instant under reduced
 * motion); pass `drawn` to drive the trace yourself.
 */
function Check({ drawn, size = 16 }: { drawn?: boolean; size?: number }) {
  return (
    <svg aria-hidden data-slot="check" width={size} height={size} viewBox="0 0 24 24">
      <path
        d="M4 12.5 L9.5 18 L20 6"
        fill="none"
        stroke="currentColor"
        strokeWidth={1.75}
        strokeLinecap="square"
        pathLength={1}
        strokeDasharray={1}
        className={drawn === undefined ? `notchset-check-draw` : undefined}
        style={drawn === undefined ? undefined : { strokeDashoffset: drawn ? 0 : 1, transition: "stroke-dashoffset var(--notchset-check) var(--notchset-ease-travel)" }}
      />
    </svg>
  );
}

/** The scanner: five 1px ticks fading in turn while something works (static, centre lit, when motion is off). */
function Scanner({ height = 12 }: { height?: number }) {
  return (
    <span aria-hidden data-slot="scanner" className={cn(`notchset-scanner`, "inline-flex items-end gap-[2px]")} style={{ height }}>
      {[0.82, 0.66, 1, 0.66, 0.82].map((h, i) => (
        <span key={i} className="w-px bg-current" style={{ height: height * h, animationDelay: `${i * 140 - 700}ms` }} />
      ))}
    </span>
  );
}

// ---------------------------------------------------------------------------------------------
// Glyph flip: each character cycles through glyphs and lands at 110 + i·14ms, left to right
// ---------------------------------------------------------------------------------------------

const GLYPHS = "ABCDEFGHJKLMNPRSTUVWXYZ0123456789#/+=";
const STILL = new Set([" ", "·", "/", ".", ":"]);

export function scramble(text: string, elapsed: number) {
  let out = "";
  for (let i = 0; i < text.length; i++) {
    const ch = text[i]!;
    out += STILL.has(ch) || elapsed >= 110 + i * 14 ? ch : GLYPHS[(Math.floor(elapsed / 36) * 5 + i * 11) % GLYPHS.length];
  }
  return out;
}

/**
 * The text to show for `text`: when it changes, a few frames of glyphs that land left to right.
 * Runs on requestAnimationFrame only while a flip is active; the settled text is never state. Off
 * under reduced motion, inside data-motion="off" (pass the element) or with `off`.
 */
export function useGlyphFlip(text: string, { off = false, el }: { off?: boolean; el?: React.RefObject<Element | null> } = {}) {
  const [frame, setFrame] = React.useState<{ for: string; shown: string } | null>(null);
  const first = React.useRef(true);
  React.useEffect(() => {
    if (first.current) {
      first.current = false;
      return;
    }
    if (off || motionOff(el?.current)) return;
    let raf = 0;
    const t0 = performance.now();
    const end = 110 + text.length * 14 + 40;
    const step = (now: number) => {
      const elapsed = now - t0;
      if (elapsed >= end) return setFrame(null);
      setFrame({ for: text, shown: scramble(text, elapsed) });
      raf = requestAnimationFrame(step);
    };
    raf = requestAnimationFrame(step);
    return () => cancelAnimationFrame(raf);
  }, [text, off, el]);
  return frame && frame.for === text ? frame.shown : text;
}

/** A label that flips when its text changes; screen readers read the final text only. */
function FlipText({ children, off, className, ...props }: Omit<React.ComponentProps<"span">, "children"> & { children: string; off?: boolean }) {
  const ref = React.useRef<HTMLSpanElement>(null);
  const shown = useGlyphFlip(children, { off, el: ref });
  return (
    <span ref={ref} data-slot="flip-text" className={cn("relative whitespace-nowrap", className)} {...props}>
      <span aria-hidden>{shown}</span>
      <span className="sr-only">{children}</span>
    </span>
  );
}

// ---------------------------------------------------------------------------------------------
// Sound: Notchset components announce cues; the page's beautiful-ui-sound layer (opt-in) plays them.
// ---------------------------------------------------------------------------------------------

/** The Notchset cues, in the shared sound layer's names (played in the mechanical voice). */
export const NOTCHSET_CUES = { tap: "tap", latch: "lock", signal: "destructive", confirm: "halt", done: "success", tick: "tick" } as const;
export type NotchsetCue = keyof typeof NOTCHSET_CUES;

export function playCue(el: Element | null, cue: NotchsetCue) {
  if (!el || typeof CustomEvent === "undefined" || el.closest('[data-sound="off"]')) return;
  el.dispatchEvent(new CustomEvent("beautiful-ui:sound", { bubbles: true, detail: { cue: NOTCHSET_CUES[cue] } }));
}

// ---------------------------------------------------------------------------------------------
// Shortcuts: "⌘↵" → "Meta+Enter Control+Enter" (aria-keyshortcuts)
// ---------------------------------------------------------------------------------------------

const KEY_NAMES: Record<string, string> = { "⌘": "Meta", "⌃": "Control", "⌥": "Alt", "⇧": "Shift", "↵": "Enter", "⏎": "Enter", "⎋": "Escape", "⌫": "Backspace", "⇥": "Tab", "␣": "Space" };

export function kbdToShortcut(kbd: string | undefined): string | undefined {
  if (!kbd) return undefined;
  const parts = [...kbd.replace(/\s+/g, "")].map((c) => KEY_NAMES[c] ?? c.toUpperCase());
  if (!parts.length) return undefined;
  const combo = parts.join("+");
  // ⌘ on a Mac is Ctrl elsewhere: announce both.
  return combo.includes("Meta") ? `${combo} ${combo.replace("Meta", "Control")}` : combo;
}

/**
 * A number that rolls: each digit is a 0–9 strip; the ones digit moves first and each digit to its left
 * 40ms later (620ms, a small overshoot). `delay` offsets the whole number (rows 60ms apart). Non-digits
 * (",", "$", "%") sit still. Screen readers get the plain value.
 */
function RollingNumber({ value, height = 32, delay = 0, className }: { value: string | number; height?: number; delay?: number; className?: string }) {
  const text = String(value);
  const digits = text.split("");
  const lastDigit = digits.reduce((n, d, i) => (/\d/.test(d) ? i : n), -1);
  return (
    <span className={cn("relative inline-flex overflow-hidden tabular-nums", className)} style={{ height, lineHeight: `${height}px` }}>
      <span className="sr-only">{text}</span>
      <span aria-hidden className="flex">
        {digits.map((d, i) =>
          /\d/.test(d) ? (
            <span
              key={digits.length - i}
              className="flex flex-col transition-transform duration-[620ms] ease-[cubic-bezier(.34,1.15,.5,1)]"
              style={{ transform: `translateY(${-Number(d) * height}px)`, transitionDelay: `${delay + (lastDigit - i) * 40}ms` }}
            >
              {Array.from({ length: 10 }, (_, n) => (
                <span key={n} style={{ height }}>
                  {n}
                </span>
              ))}
            </span>
          ) : (
            <span key={`s${digits.length - i}`}>{d}</span>
          ),
        )}
      </span>
    </span>
  );
}

export { Check, Dot, FlipText, Legend, Node, Plated, RollingNumber, Scanner };
```

### lib/beautiful-ui/notchset/root.ts

```tsx
/*
 * Notchset's root attributes, server-safe (no client directive), so server components can spread
 * them too. Every Notchset root (and portalled popup) carries data-notchset (the motion policy's
 * scope), plays its own cues in the mechanical voice, and keeps the page's click layer out.
 */
export const NOTCHSET_ROOT = { "data-notchset": "", "data-sound": "none", "data-sound-voice": "analogue" } as const;

/** On every interactive element: it plays its own cues, so the page's click layer adds no tap. */
export const OWN_SOUND = { "data-sound": "none" } as const;
```

The notchset foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://beautiful-ui.dev/r/notchset-foundation.json.