# Input OTP (Notchset): prompt.md (v1.0.0)

- id: `input-otp` · version 1.0.0 · component · free
- category: Inputs
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add https://beautiful-ui.dev/r/input-otp.json`
- npm dependencies: input-otp@^1
- registry dependencies: utils, https://beautiful-ui.dev/r/notchset-foundation.json
- docs: https://beautiful-ui.dev/components/input-otp
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

shadcn's Input OTP in Notchset: 56px cells over one hidden input, a blinking caret, characters settling in, a node separator that fills, and a verify state that inks the cells or shakes them.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: `input-otp@^1`.
- Files: `components/ui/notchset/input-otp.tsx`; shared code: `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `notchset-foundation`.
- Builds: one set of files for both, but its dependencies come in Base UI and Radix builds. 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: `InputOTP`, `InputOTPGroup`, `InputOTPSeparator`, `InputOTPSlot`, `InputOTPVerify`, 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 { InputOTPVerify } from "@/components/ui/notchset/input-otp";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `InputOTP` | `input-otp` | The input. |
| `InputOTPSlot` | `input-otp-slot` | One cell. |
| `InputOTPVerify` | `input-otp-verify` | The designed whole. |

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/input-otp.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
- otp, one-time code, verification code, 2fa code, pin input, shadcn input otp, Notchset
- Two-factor codes, approval codes, email verification

### Not when
- Passwords: use Password Field

## Mistakes
- Return a Promise from onComplete; the cells lock while it runs

## Usage

```tsx
"use client";

import { InputOTPVerify } from "@/components/ui/notchset/input-otp";

export function VerifyEmail({ verify, resend }: { verify: (code: string) => Promise<boolean>; resend: () => Promise<void> }) {
  return <InputOTPVerify onComplete={verify} onResend={resend} />;
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `InputOTP` | `input-otp props + state, uppercase` |  | shadcn's root; state is idle, checking, ok or bad. |
| `InputOTPGroup / InputOTPSlot / InputOTPSeparator` | `components` |  | As shadcn; the separator fills once `after` characters are in. |
| `InputOTPVerify` | `{ length, onComplete, onResend, resendAfter, tries, labels }` |  | The designed whole: verify, status and resend. |

Full docs: https://beautiful-ui.dev/components/input-otp

## 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 |
|---|---|
| Type / paste | Fill |
| Backspace | Step back |

## Performance

- One input and six cells; the shake uses the Web Animations API.

## Responsive

- Cells share the width; 56px tall at every size.

## Motion inventory

| Interaction | What moves |
|---|---|
| Type | Each character settles in from 6px (320ms pop); the caret blinks |
| Approved | Cells fill ink 50ms apart |
| Wrong | Signal, a ±4px shake, then the code clears after 700ms |

## Accessibility contract (preserve when editing)
- One real input with autocomplete one-time-code: paste and SMS autofill work
- Letters and digits are accepted and upper-cased
- The status line is polite live text

## Install

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

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

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

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

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

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

## Source (Base UI build)

### components/ui/notchset/input-otp.tsx

```tsx
"use client";

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

import * as React from "react";
import { OTPInput, OTPInputContext } from "input-otp";
import { cn } from "@/lib/utils";
import { NOTCHSET_ROOT, OWN_SOUND, Scanner, motionOff, playCue, useLatest } from "@/lib/beautiful-ui/notchset/instrument";

/*
 * Notchset Input OTP (handoff 1.9; built on input-otp like shadcn's, one file for both builds). One
 * hidden input behind the cells (autocomplete one-time-code, paste fills every cell), letters and
 * digits upper-cased. Cells are 56px: the active one has a 2px ink border and a blinking caret; a
 * character settles in from 6px. The separator is a node on a rule that fills once the group before
 * it is complete. `state` drives verification: checking, ok (the cells fill ink 50ms apart) and bad
 * (signal, a ±4px shake). InputOTPVerify is the designed whole: verify, status line and resend.
 */

type OTPState = "idle" | "checking" | "ok" | "bad";
const StateContext = React.createContext<OTPState>("idle");

function InputOTP({
  className,
  containerClassName,
  state = "idle",
  uppercase = true,
  onChange,
  ...props
}: React.ComponentProps<typeof OTPInput> & { containerClassName?: string; state?: OTPState; uppercase?: boolean }) {
  const box = React.useRef<HTMLDivElement>(null);
  // A refusal shakes the cells: -4, +4, -4, +4, rest, 50ms each.
  React.useEffect(() => {
    const el = box.current;
    if (state !== "bad" || !el || motionOff(el)) return;
    const at = (x: number, offset: number): Keyframe => ({ transform: x ? `translateX(${x}px)` : "none", offset, easing: "step-end" });
    el.animate([at(-4, 0), at(4, 0.2), at(-4, 0.4), at(4, 0.6), at(0, 0.8), at(0, 1)], { duration: 250 });
  }, [state]);
  return (
    <StateContext value={state}>
      <div ref={box} {...NOTCHSET_ROOT} data-slot="input-otp-root" data-state={state} className="w-full">
        <OTPInput
          data-slot="input-otp"
          containerClassName={cn("flex w-full items-center gap-1.5 has-disabled:opacity-100", containerClassName)}
          className={cn("disabled:cursor-default", className)}
          spellCheck={false}
          autoComplete="one-time-code"
          autoCapitalize="characters"
          onChange={(v: string) => onChange?.(uppercase ? v.toUpperCase() : v)}
          pasteTransformer={(p) => (uppercase ? p.toUpperCase() : p).replace(/\s|-/g, "")}
          {...props}
        />
      </div>
    </StateContext>
  );
}

function InputOTPGroup({ className, ...props }: React.ComponentProps<"div">) {
  return <div data-slot="input-otp-group" className={cn("flex flex-1 items-center gap-1.5", className)} {...props} />;
}

function InputOTPSlot({ index, className, ...props }: React.ComponentProps<"div"> & { index: number }) {
  const ctx = React.useContext(OTPInputContext);
  const state = React.useContext(StateContext);
  const slot = ctx?.slots[index];
  const char = slot?.char ?? null;
  const locked = state === "checking" || state === "ok";
  const active = !!slot?.isActive && !locked;
  return (
    <div
      data-slot="input-otp-slot"
      data-active={active || undefined}
      data-filled={char ? "" : undefined}
      className={cn(
        "relative flex h-14 min-w-0 flex-1 items-center justify-center border border-solid border-[var(--notchset-control-edge,var(--input))] bg-background transition-[background-color,border-color] duration-[200ms,140ms] ease-linear",
        "data-[filled]:border-foreground data-[active]:border-2 data-[active]:border-foreground",
        state === "bad" && "!border-[var(--notchset-signal-text,var(--destructive))]",
        state === "ok" && "border-foreground bg-foreground",
        className,
      )}
      style={state === "ok" ? { transitionDelay: `${index * 50}ms` } : undefined}
      {...props}
    >
      {char && (
        <span
          key={char}
          className={cn(
            "font-mono text-[26px] leading-none font-light transition-colors duration-200 ease-linear motion-safe:animate-[notchset-fade-in_160ms_linear_both,notchset-lift_320ms_cubic-bezier(.34,1.6,.5,1)_both]",
            state === "ok" ? "text-background" : state === "bad" ? "text-[var(--notchset-signal-text,var(--destructive))]" : "text-foreground",
          )}
          style={state === "ok" ? { transitionDelay: `${index * 50}ms` } : undefined}
        >
          {char}
        </span>
      )}
      {active && slot?.hasFakeCaret && <span aria-hidden className="absolute start-1/2 top-4 h-6 w-px bg-foreground motion-safe:animate-[notchset-blink_1s_steps(1)_infinite]" />}
    </div>
  );
}

/** A node on a rule between groups; it fills once `after` characters are in (half the cells by default). */
function InputOTPSeparator({ after, className, ...props }: React.ComponentProps<"div"> & { after?: number }) {
  const ctx = React.useContext(OTPInputContext);
  const state = React.useContext(StateContext);
  const slots = ctx?.slots ?? [];
  const filled = slots.filter((s) => s.char).length;
  const on = state === "ok" || filled >= (after ?? Math.floor(slots.length / 2));
  return (
    <div data-slot="input-otp-separator" role="separator" className={cn("flex w-3.5 flex-none items-center justify-center", className)} {...props}>
      <svg aria-hidden width="14" height="7" viewBox="0 0 14 7" className={cn("overflow-visible transition-colors duration-200 ease-linear", on ? "text-foreground" : "text-[var(--notchset-control-edge,var(--input))]")}>
        <line x1="0" y1="3.5" x2="14" y2="3.5" stroke="currentColor" strokeWidth="1" />
        <circle cx="7" cy="3.5" r="2.4" strokeWidth="1" stroke="currentColor" className="fill-background" />
        <circle cx="7" cy="3.5" fill="currentColor" className={cn("transition-[r] duration-300 ease-[var(--notchset-ease-bloom)]", on ? "[r:1.2px]" : "[r:0px]")} />
      </svg>
    </div>
  );
}

/**
 * The designed whole: two groups of cells, verify on the last character (scanner while checking),
 * the status line, and RESEND that counts down first. `onComplete` resolves true to approve.
 */
function InputOTPVerify({
  length = 6,
  pattern = "^[0-9A-Za-z]+$",
  onComplete,
  onResend,
  resendAfter = 30,
  tries: triesProp = 3,
  labels,
  ariaLabel = "One-time code",
  className,
}: {
  length?: number;
  pattern?: string;
  onComplete: (code: string) => Promise<boolean> | boolean;
  onResend?: () => void;
  resendAfter?: number;
  tries?: number;
  labels?: { idle?: string; checking?: string; ok?: string; wrong?: (left: number) => string; resend?: string; resendIn?: (s: number) => string; done?: string };
  ariaLabel?: string;
  className?: string;
}) {
  const [value, setValue] = React.useState("");
  const [state, setState] = React.useState<OTPState>("idle");
  const [tries, setTries] = React.useState(triesProp);
  const [left, setLeft] = React.useState(resendAfter);
  const input = React.useRef<HTMLInputElement>(null);
  const latest = useLatest({ onComplete });
  const op = React.useRef(0);
  React.useEffect(() => {
    if (left <= 0 || state === "ok") return;
    const t = setTimeout(() => setLeft((l) => l - 1), 1000);
    return () => clearTimeout(t);
  }, [left, state]);
  React.useEffect(() => () => void op.current++, []);

  const check = (code: string) => {
    const me = ++op.current;
    setState("checking");
    playCue(input.current, "tick");
    // Wrong code or a failed check (throw or rejection): show it, then clear and let them retry.
    // Only a wrong code spends a try.
    const retry = (spendTry: boolean) => {
      if (op.current !== me) return;
      setState("bad");
      if (spendTry) setTries((t) => t - 1);
      playCue(input.current, "signal");
      setTimeout(() => {
        if (op.current !== me) return;
        setValue("");
        setState("idle");
        input.current?.focus({ preventScroll: true });
      }, 700);
    };
    Promise.resolve()
      .then(() => latest.current.onComplete(code))
      .then(
        (ok) => {
          if (op.current !== me) return;
          if (!ok) return retry(true);
          setState("ok");
          playCue(input.current, "done");
        },
        () => retry(false),
      );
  };

  const half = Math.ceil(length / 2);
  const status =
    state === "ok" ? (labels?.ok ?? "APPROVED") : state === "bad" ? (labels?.wrong?.(tries) ?? `WRONG CODE · ${tries} TRIES LEFT`) : state === "checking" ? (labels?.checking ?? "CHECKING") : (labels?.idle ?? "TYPE OR PASTE");
  return (
    <div data-slot="input-otp-verify" className={cn("flex flex-col gap-[22px]", className)}>
      <InputOTP
        ref={input}
        aria-label={ariaLabel}
        maxLength={length}
        pattern={pattern}
        value={value}
        state={state}
        disabled={state === "checking" || state === "ok"}
        onChange={(v) => {
          if (state === "bad") return;
          if (v.length > value.length) playCue(input.current, "tick");
          setValue(v);
          if (v.length === length) check(v);
        }}
      >
        <InputOTPGroup>
          {Array.from({ length: half }, (_, i) => (
            <InputOTPSlot key={i} index={i} />
          ))}
        </InputOTPGroup>
        <InputOTPSeparator after={half} />
        <InputOTPGroup>
          {Array.from({ length: length - half }, (_, i) => (
            <InputOTPSlot key={i} index={half + i} />
          ))}
        </InputOTPGroup>
      </InputOTP>
      <div className="flex items-center justify-between gap-3 border-t border-solid border-[var(--notchset-rule,var(--border))] pt-4">
        <span
          aria-live="polite"
          className={cn(
            "flex items-center gap-2 font-mono text-[9px] tracking-[0.04em] whitespace-nowrap",
            state === "bad" ? "text-[var(--notchset-signal-text,var(--destructive))]" : state === "ok" ? "text-foreground" : "text-muted-foreground",
          )}
        >
          {state === "checking" && <Scanner height={10} />}
          {status}
        </span>
        <button
          {...OWN_SOUND}
          type="button"
          disabled={left > 0 || state === "ok"}
          onClick={(e) => {
            playCue(e.currentTarget, "tick");
            op.current++;
            setLeft(resendAfter);
            setValue("");
            setState("idle");
            setTries(triesProp);
            onResend?.();
            input.current?.focus({ preventScroll: true });
          }}
          className={cn(
            `notchset-focus`,
            "[--notchset-focus-inset:-3px] flex h-6 cursor-pointer items-center border border-solid border-foreground bg-transparent px-2 font-mono text-[9px] font-medium tracking-[0.08em] whitespace-nowrap text-foreground tabular-nums disabled:cursor-default disabled:border-[var(--notchset-rule,var(--border))] disabled:text-muted-foreground pointer-coarse:h-11",
          )}
        >
          {state === "ok" ? (labels?.done ?? "DONE") : left > 0 ? (labels?.resendIn?.(left) ?? `RESEND IN 0:${String(left).padStart(2, "0")}`) : (labels?.resend ?? "RESEND CODE")}
        </button>
      </div>
    </div>
  );
}

export { InputOTP, InputOTPGroup, InputOTPSeparator, InputOTPSlot, InputOTPVerify };
```

### 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.
