# Plan Compare (Notchset): prompt.md (v1.0.0)

- id: `plan-compare` · version 1.0.0 · block · free
- category: Marketing
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add https://beautiful-ui.dev/r/plan-compare.json`
- npm dependencies: none
- registry dependencies: utils, @beautiful-ui/segmented-control, https://beautiful-ui.dev/r/notchset-foundation.json
- docs: https://beautiful-ui.dev/components/plan-compare
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

A plan comparison for deciding whether to upgrade from the plan you're on: plans as columns with rolling prices and their action (CURRENT PLAN, UPGRADE, SELECTED), a monthly or yearly switch, gain markers on every row a hovered plan changes with the count in the footer, and ONLY DIFFERENCES folding away rows that are the same everywhere.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: none beyond React.
- Files: `components/ui/notchset/blocks/plan-compare.tsx`; shared code: `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`, `lib/beautiful-ui/notchset/switch-track.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `segmented-control`, `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: `PlanCompare`, 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-glide`, `--notchset-ease-key-down`, `--notchset-ease-key-up`, `--notchset-ease-travel`, `--notchset-fade`, `--notchset-focus-color`, `--notchset-focus-inset`, `--notchset-grow-to`, `--notchset-key-down`, `--notchset-key-up`, `--notchset-life-from`, `--notchset-life-ms`, `--notchset-node-blink`, `--notchset-node-bloom`, `--notchset-node-delay`, `--notchset-plate-color`, `--notchset-rise-from`, `--notchset-rule`, `--notchset-scan-to`, `--notchset-scroll`, `--notchset-signal`, `--notchset-sweep-to`, `--notchset-travel`). Never add Tailwind colour classes inside the component.

```tsx
import { PlanCompare } from "@/components/ui/notchset/blocks/plan-compare";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `PlanCompare` | `plan-compare` | The controls, the table and the footer. |

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/blocks/plan-compare.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
- pricing table, plan comparison, compare plans, upgrade, feature matrix, billing plans, Notchset
- An upgrade page inside the product, where the current plan is known
- A pricing page's feature matrix

### Not when
- One plan only: show its features as a list
- Picking by team size: use Seat Pricing

## Mistakes
- Prices come from your billing API: never hard-code what checkout charges
- Keep row values comparable (the same unit across plans), or every row reads as a difference

## Usage

```tsx
import { PlanCompare } from "@/components/ui/notchset/blocks/plan-compare";

export function Upgrade() {
  return (
    <PlanCompare
      current="builder"
      plans={[
        { id: "builder", name: "Builder", price: { monthly: 29, yearly: 23 } },
        { id: "team", name: "Team", price: { monthly: 99, yearly: 79 }, emphasis: true },
      ]}
      rows={[
        { label: "Seats", values: { builder: "1", team: "Up to 50" } },
        { label: "SSO", values: { builder: false, team: true } },
      ]}
      onSelect={(plan, billing) => fetch("/api/upgrade", { method: "POST", body: JSON.stringify({ plan, billing }) })}
    />
  );
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `plans` | `{ id, name, price: { monthly, yearly }, billing?, action?, emphasis? }[]` |  | Columns, in order; emphasis makes the action ink. |
| `rows` | `{ label, values: Record<planId, string \| boolean> }[]` |  | true is ✓ (Included), false is — (Not included). |
| `current` | `string` |  | The plan the account is on. |
| `onSelect / selectedNote / currency` | `(planId, billing) => Promise / (plan, price) => string / (n) => string` |  | Pick a plan (reject to put the button back), the footer after picking, and money formatting. |

Full docs: https://beautiful-ui.dev/components/plan-compare

## 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 |
|---|---|
| Tab | The switch, billing, each plan's action, the table |
| ← → | Scroll the table on narrow screens (focus it first) |

## Performance

- Plain grid markup; hover only toggles classes.

## Responsive

- The table keeps 720px and scrolls sideways below it.

## Motion inventory

| Interaction | What moves |
|---|---|
| Billing | Prices roll |
| Hover a plan | Its cells tint, a 3px bar grows along its header, ↑ rises into each row that differs (18ms apart) |
| Only differences | Same rows fold away (260ms) and the rest close up |

## Accessibility contract (preserve when editing)
- A real table (table, rows, column and row headers); folded rows leave the accessibility tree
- ✓ and — are named Included and Not included; the table region scrolls with the keyboard
- The ONLY DIFFERENCES switch is a switch; counts and the footer are announced

## Install

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

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

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

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

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

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

## Source (Base UI build)

### components/ui/notchset/blocks/plan-compare.tsx

```tsx
"use client";

import * as React from "react";
import { cn } from "@/lib/utils";
import { SwitchTrack } from "@/lib/beautiful-ui/notchset/switch-track";
import { SegmentedControl } from "@/components/ui/notchset/segmented-control";
import { NOTCHSET_ROOT, OWN_SOUND, RollingNumber, Scanner, playCue } from "@/lib/beautiful-ui/notchset/instrument";

/*
 * Notchset Plan Compare (a block, one file for both builds). Decide whether to upgrade from the plan you
 * are on: plans as columns with rolling prices and their action (CURRENT PLAN, UPGRADE, SELECTED);
 * hovering a column marks every row where it differs from yours, with the count in the footer; ONLY
 * DIFFERENCES folds away rows that are the same everywhere. The table scrolls sideways under 720px.
 */

export type ComparePlan = { id: string; name: string; price: { monthly: number; yearly: number }; billing?: { monthly: string; yearly: string }; action?: string; emphasis?: boolean };
export type CompareRow = { label: string; values: Record<string, string | boolean> };

export type PlanCompareProps = Omit<React.ComponentProps<"section">, "children" | "onSelect"> & {
  plans: readonly ComparePlan[];
  rows: readonly CompareRow[];
  /** The plan the account is on (its column reads CURRENT PLAN). */
  current: string;
  /** Pick a plan; resolve to confirm (✓ SELECTED), reject to put the button back. */
  onSelect?: (planId: string, billing: "monthly" | "yearly") => Promise<unknown>;
  /** The footer once a plan is picked. */
  selectedNote?: (plan: ComparePlan, price: number) => string;
  currency?: (n: number) => string;
};

const same = (row: CompareRow, plans: readonly ComparePlan[]) => plans.every((p) => row.values[p.id] === row.values[plans[0]!.id]);

function Cell({ value }: { value: string | boolean | undefined }) {
  if (value === true)
    return (
      <svg role="img" aria-label="Included" width="14" height="14" viewBox="0 0 14 14">
        <path d="M2.5 7.4 L5.6 10.4 L11.6 3.8" fill="none" className="stroke-foreground" strokeWidth="1.6" />
      </svg>
    );
  if (value === false || value === undefined)
    return (
      <span aria-label="Not included" className="text-muted-foreground">
        —
      </span>
    );
  return <span>{value}</span>;
}

function PlanCompare({ plans, rows, current, onSelect, selectedNote, currency = (n) => `$${n.toLocaleString("en-US")}`, className, ...props }: PlanCompareProps) {
  const [billing, setBilling] = React.useState<"monthly" | "yearly">("monthly");
  const [onlyDiff, setOnlyDiff] = React.useState(false);
  const [hover, setHover] = React.useState<string | null>(null);
  const [picked, setPicked] = React.useState<string | null>(null);
  const [busy, setBusy] = React.useState<string | null>(null);
  const root = React.useRef<HTMLElement>(null);
  const currentPlan = plans.find((p) => p.id === current);
  const diffRows = (id: string) => rows.filter((r) => r.values[id] !== r.values[current]).length;
  const visible = rows.filter((r) => !onlyDiff || !same(r, plans)).length;
  const cols = `minmax(150px,1.2fr) repeat(${plans.length}, minmax(150px,1fr))`;

  const pick = async (plan: ComparePlan) => {
    if (plan.id === current) {
      playCue(root.current, "signal");
      return;
    }
    if (busy) return;
    setBusy(plan.id);
    try {
      await onSelect?.(plan.id, billing);
      playCue(root.current, "done");
      setPicked(plan.id);
    } catch {
      playCue(root.current, "signal");
    }
    setBusy(null);
  };
  const pickedPlan = plans.find((p) => p.id === picked);
  const footer = pickedPlan
    ? (selectedNote?.(pickedPlan, pickedPlan.price[billing]) ?? `${pickedPlan.name.toUpperCase()} · ${currency(pickedPlan.price[billing])} / MO · CHANGES APPLY TODAY, PRORATED`)
    : hover && hover !== current
      ? `${plans.find((p) => p.id === hover)?.name.toUpperCase()} CHANGES ${diffRows(hover)} OF ${rows.length} ROWS COMPARED WITH ${currentPlan?.name.toUpperCase()}`
      : `HOVER A PLAN TO SEE WHAT CHANGES FROM ${currentPlan?.name.toUpperCase()}`;

  return (
    <section {...NOTCHSET_ROOT} ref={root} data-slot="plan-compare" aria-label="Compare plans" className={cn("box-border border border-solid border-foreground bg-background text-foreground", className)} {...props}>
      <div className="flex flex-wrap items-center justify-between gap-3 border-0 border-b border-solid border-[var(--notchset-rule,var(--border))] px-5 py-4">
        <span className="flex items-center gap-3 font-mono text-[10px] tracking-[0.1em] text-muted-foreground">
          <button
            {...OWN_SOUND}
            type="button"
            role="switch"
            aria-checked={onlyDiff}
            onClick={() => {
              playCue(root.current, "tick");
              setOnlyDiff((d) => !d);
            }}
            className={cn(`notchset-focus`, "flex h-[30px] cursor-pointer items-center gap-2 border border-solid border-[var(--notchset-control-edge,var(--input))] bg-transparent px-2.5 font-mono text-[10px] font-medium tracking-[0.1em] text-foreground [--notchset-focus-inset:-4px]")}
          >
            ONLY DIFFERENCES
            <SwitchTrack on={onlyDiff} />
          </button>
          <span aria-live="polite" className="flex items-center gap-1">
            <RollingNumber value={visible} height={12} className="font-medium text-foreground" /> OF {rows.length} ROWS
          </span>
        </span>
        <SegmentedControl
          aria-label="Billing"
          size="sm"
          segment={84}
          options={[
            { value: "monthly", label: "MONTHLY" },
            { value: "yearly", label: "YEARLY" },
          ]}
          value={billing}
          onValueChange={(v) => setBilling(v as "monthly" | "yearly")}
        />
      </div>
      <div tabIndex={0} role="region" aria-label="Plan table" className="overflow-x-auto focus-visible:outline-2 focus-visible:outline-foreground" onMouseLeave={() => setHover(null)}>
        <div role="table" className="min-w-[720px]">
          <div role="row" className="grid border-0 border-b border-solid border-foreground" style={{ gridTemplateColumns: cols }}>
            <span role="columnheader" className="flex items-end px-5 pb-4 font-mono text-[10px] tracking-[0.12em] text-muted-foreground">
              FEATURES
            </span>
            {plans.map((p) => {
              const isCurrent = p.id === current;
              const on = hover === p.id;
              return (
                <div
                  key={p.id}
                  role="columnheader"
                  onMouseEnter={() => setHover(p.id)}
                  className={cn("relative flex flex-col gap-1.5 px-4 pt-5 pb-4 transition-colors duration-(--notchset-fade) ease-(--notchset-ease-fade)", on && "bg-[var(--notchset-faceplate,var(--muted))]")}
                >
                  <span aria-hidden className={cn("absolute inset-x-0 top-0 h-[3px] origin-left bg-foreground transition-[scale] duration-(--notchset-travel) ease-(--notchset-ease-glide)", on ? "scale-x-100" : "scale-x-0")} />
                  <span className="flex items-center gap-2">
                    <span className="text-[18px] font-extrabold uppercase [font-stretch:62%]">{p.name}</span>
                    {isCurrent && <span className="border border-solid border-foreground px-1 font-mono text-[10px] leading-4 tracking-[0.08em]">CURRENT</span>}
                  </span>
                  <span className="flex items-baseline gap-1">
                    <RollingNumber value={currency(p.price[billing])} height={30} className="text-[28px] font-semibold" />
                    <span className="font-mono text-[10px] text-muted-foreground">/ MO</span>
                  </span>
                  <span className="min-h-3.5 font-mono text-[10px] tracking-[0.06em] text-muted-foreground">{p.billing?.[billing] ?? ""}</span>
                  <button
                    {...OWN_SOUND}
                    type="button"
                    aria-disabled={isCurrent || undefined}
                    aria-busy={busy === p.id || undefined}
                    onClick={() => pick(p)}
                    className={cn(
                      `notchset-focus`,
                      "mt-1 flex h-9 cursor-pointer items-center justify-center gap-2 border border-solid font-mono text-[10px] font-medium tracking-[0.08em] whitespace-nowrap transition-colors duration-(--notchset-fade) ease-(--notchset-ease-fade) [--notchset-focus-inset:-4px]",
                      isCurrent ? "cursor-default border-[var(--notchset-rule,var(--border))] bg-transparent text-muted-foreground" : p.emphasis ? "border-foreground bg-foreground text-background" : "border-foreground bg-transparent text-foreground hover:bg-accent",
                    )}
                  >
                    {busy === p.id && <Scanner height={8} />}
                    {isCurrent ? "CURRENT PLAN" : picked === p.id ? "✓ SELECTED" : (p.action ?? `UPGRADE TO ${p.name.toUpperCase()}`)}
                  </button>
                </div>
              );
            })}
          </div>
          {rows.map((row, i) => {
            const hidden = onlyDiff && same(row, plans);
            return (
              // The fold wrappers are presentational, so the table's rows stay its rows.
              <div key={row.label} role="presentation" className={cn("grid grid-cols-[minmax(0,1fr)] transition-[grid-template-rows,opacity] ease-(--notchset-ease-fold)", hidden ? "grid-rows-[0fr] opacity-0 duration-[260ms]" : "grid-rows-[1fr] opacity-100 duration-(--notchset-unfold)")} aria-hidden={hidden || undefined}>
                <div role="presentation" className="min-h-0 overflow-hidden">
                  <div role="row" className="grid min-h-11 border-0 border-b border-solid border-[var(--notchset-rule,var(--border))]" style={{ gridTemplateColumns: cols }}>
                    <span role="rowheader" className="flex items-center px-5 text-[14px]">
                      {row.label}
                    </span>
                    {plans.map((p) => {
                      const gain = hover === p.id && p.id !== current && row.values[p.id] !== row.values[current];
                      return (
                        <span key={p.id} role="cell" onMouseEnter={() => setHover(p.id)} className={cn("relative flex items-center gap-2 px-4 font-mono text-[12px] transition-colors duration-(--notchset-fade) ease-(--notchset-ease-fade)", hover === p.id && "bg-[var(--notchset-faceplate,var(--muted))]")}>
                          <Cell value={row.values[p.id]} />
                          <span aria-hidden className={cn("font-mono text-[12px] transition-[opacity,translate] duration-(--notchset-key-up) ease-(--notchset-ease-key-up)", gain ? "translate-y-0 opacity-100" : "translate-y-1 opacity-0")} style={{ transitionDelay: gain ? `${i * 18}ms` : "0ms" }}>
                            ↑
                          </span>
                        </span>
                      );
                    })}
                  </div>
                </div>
              </div>
            );
          })}
        </div>
      </div>
      <div aria-live="polite" className="px-5 py-3.5 font-mono text-[10px] tracking-[0.08em] text-muted-foreground">
        {footer}
      </div>
    </section>
  );
}

export { PlanCompare };
```

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

```tsx
"use client";

import * as React from "react";
import { createPortal } from "react-dom";
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
// ---------------------------------------------------------------------------------------------

/**
 * 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);
      },
    );
  });
}

/** True under prefers-reduced-motion or inside a data-motion="off" scope. Checked when an effect runs. */
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;
  };
}

/**
 * Puts text on the clipboard. Resolves true once it is there and false when the browser refuses (no
 * permission, an insecure page, no clipboard API), so a "copied" state is only ever shown for a copy.
 */
export async function copyText(text: string): Promise<boolean> {
  try {
    await navigator.clipboard.writeText(text);
    return true;
  } catch {
    return false;
  }
}

/** The glide easing shared by travelling marks (selection blocks, highlights, runs). */
export const GLIDE = "cubic-bezier(.65,0,.35,1)";

/** Base UI's className may be a function of state: merges ours with it in either form. */
export const withClass =
  <S,>(base: string, className: string | ((state: S) => string | undefined) | undefined) =>
  (state: S) =>
    cn(base, typeof className === "function" ? className(state) : className);

/** 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 each step on its own animation frame, in order (the first on the next frame), and returns one
 * cancel that stops whichever frame is pending. A no-op step just waits a frame: frames(set pre, wait,
 * go) lets the browser paint the start state before the transition begins.
 */
export function frames(...steps: (() => void)[]): () => void {
  let id = 0;
  let i = 0;
  const tick = () => {
    steps[i++]?.();
    if (i < steps.length) id = requestAnimationFrame(tick);
  };
  id = requestAnimationFrame(tick);
  return () => cancelAnimationFrame(id);
}
export const wait = () => {};

let idSeq = 0;
/** A unique id for something the user creates (a milestone, a note): random where the browser can, else a counter. */
export const newId = () => (typeof crypto !== "undefined" && "randomUUID" in crypto ? crypto.randomUUID() : `id-${Date.now()}-${++idSeq}`);

/**
 * True while an input method (Japanese, Chinese, Korean…) is composing: Enter, Tab and delimiters
 * then belong to the composition, not to the component. keyCode 229 covers Safari's late flag.
 */
export function composing(e: React.KeyboardEvent | KeyboardEvent) {
  const native = "nativeEvent" in e ? e.nativeEvent : e;
  return native.isComposing || native.keyCode === 229;
}

const hotkeyOwners = new Map<string, number[]>();
let hotkeySeq = 0;
/**
 * A page-wide shortcut ("/" or "mod+k", mod being ⌘ or Ctrl) with a single owner: when several
 * components claim the same key, only the one mounted last answers, so one press never opens two.
 * A plain key is ignored while typing in a field.
 */
export function useHotkey(combo: string | undefined, run: () => void) {
  const latest = useLatest(run);
  React.useEffect(() => {
    if (!combo) return;
    const me = ++hotkeySeq;
    const stack = hotkeyOwners.get(combo) ?? [];
    stack.push(me);
    hotkeyOwners.set(combo, stack);
    const mod = combo.startsWith("mod+");
    const key = (mod ? combo.slice(4) : combo).toLowerCase();
    const onKey = (e: KeyboardEvent) => {
      if (hotkeyOwners.get(combo)?.at(-1) !== me || e.key.toLowerCase() !== key) return;
      if (mod ? !(e.metaKey || e.ctrlKey) : e.metaKey || e.ctrlKey || e.altKey) return;
      if (!mod && (e.target as HTMLElement | null)?.closest("input, textarea, select, [contenteditable=true]")) return;
      e.preventDefault();
      latest.current();
    };
    window.addEventListener("keydown", onKey);
    return () => {
      window.removeEventListener("keydown", onKey);
      const s = hotkeyOwners.get(combo) ?? [];
      s.splice(s.indexOf(me), 1);
    };
  }, [combo, latest]);
}

/** 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;
}

const subscribeNothing = () => () => {};

/**
 * A scope that turns motion or sound off for everything inside it, popups included. A plain
 * data-motion="off" wrapper can't reach a menu that portals to the body; this one also gives its
 * overlays a portal host carrying the same preferences (inside any outer scope's host), so motionOff
 * and the cues see them there too.
 */
export function NotchsetScope({ motion, sound, children, ...props }: React.ComponentProps<"div"> & { motion?: "off"; sound?: "off" }) {
  const outer = React.useContext(NotchsetPortalContext);
  const [host, setHost] = React.useState<HTMLElement | null>(null);
  const client = React.useSyncExternalStore(subscribeNothing, () => true, () => false);
  return (
    <div data-motion={motion} data-sound={sound} {...props}>
      <NotchsetPortalContext value={host ?? outer}>{children}</NotchsetPortalContext>
      {client && createPortal(<div ref={setHost} data-slot="notchset-scope-host" data-motion={motion} data-sound={sound} />, outer ?? document.body)}
    </div>
  );
}

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([" ", "·", "/", ".", ":"]);
const FLIP_CHARS = 24;

export function scramble(text: string, elapsed: number) {
  let out = "";
  for (let i = 0; i < text.length; i++) {
    const ch = text[i]!;
    // Characters past the 24th land with the 24th, so a long label flips as briefly as a short one.
    out += STILL.has(ch) || elapsed >= 110 + Math.min(i, FLIP_CHARS) * 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 + Math.min(text.length, FLIP_CHARS) * 14 + 40;
    const step = (now: number) => {
      const elapsed = now - t0;
      if (elapsed >= end) {
        setFrame(null);
        return;
      }
      setFrame({ for: text, shown: scramble(text, elapsed) });
      raf = requestAnimationFrame(step);
    };
    raf = requestAnimationFrame(step);
    return () => cancelAnimationFrame(raf);
  }, [text, off, el]);
  // Turned off mid-flip, the label shows its text at once (the cancelled frame never lingers).
  return !off && 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, ref: refProp, ...props }: Omit<React.ComponentProps<"span">, "children"> & { children: string; off?: boolean }) {
  const ref = React.useRef<HTMLSpanElement>(null);
  const refs = useComposedRefs<HTMLSpanElement>(refProp, ref);
  const shown = useGlyphFlip(children, { off, el: ref });
  return (
    <span {...props} ref={refs} data-slot="flip-text" className={cn("relative whitespace-nowrap", className)}>
      <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;
}

/**
 * Digits that roll: each digit is a 0–9 strip; the ones digit moves first and each digit to its left
 * 40ms later, counting digits only (620ms, a small overshoot). `delay` offsets the whole text. Other
 * characters (",", "$", "%", letters) sit still. Screen readers get the plain text. The one
 * implementation behind RollingNumber and the calendar's RollingLabel.
 */
export function DigitRoll({ text, height, delay = 0, className }: { text: string; height: number; delay?: number; className?: string }) {
  const chars = [...text];
  let k = 0;
  const order = chars.map((_, i) => (/\d/.test(chars[chars.length - 1 - i]!) ? k++ : 0)).reverse();
  return (
    <span className={cn("relative inline-flex flex-none overflow-hidden tabular-nums", className)} style={{ height, lineHeight: `${height}px` }}>
      <span className="sr-only">{text}</span>
      <span aria-hidden className="flex">
        {chars.map((d, i) =>
          /\d/.test(d) ? (
            <span
              key={chars.length - i}
              className="flex flex-col transition-transform duration-[620ms] ease-[cubic-bezier(.34,1.15,.5,1)] motion-reduce:transition-none"
              style={{ transform: `translateY(${-Number(d) * height}px)`, transitionDelay: `${delay + order[i]! * 40}ms` }}
            >
              {Array.from({ length: 10 }, (_, n) => (
                <span key={n} style={{ height }}>
                  {n}
                </span>
              ))}
            </span>
          ) : (
            <span key={`s${chars.length - i}`}>{d}</span>
          ),
        )}
      </span>
    </span>
  );
}

/** A number that rolls (DigitRoll at the readout's own size). `delay` offsets it (rows 60ms apart). */
function RollingNumber({ value, height = 32, delay = 0, className }: { value: string | number; height?: number; delay?: number; className?: string }) {
  return <DigitRoll text={String(value)} height={height} delay={delay} {...(className ? { className } : {})} />;
}

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;
```

### lib/beautiful-ui/notchset/switch-track.tsx

```tsx
import { cn } from "@/lib/utils";

/*
 * The Notchset switch's track: a ruled box with an ink thumb that stretches across, leading edge first
 * and the trailing edge 85ms behind (the Billing Toggle's motion). One look for every switch in the
 * system, so blocks and components read as the same controls. Put it inside a role="switch" button.
 */
export function SwitchTrack({ on, className }: { on: boolean; className?: string }) {
  const glide = "300ms var(--notchset-ease-glide)";
  return (
    <span aria-hidden data-slot="switch-track" className={cn("relative box-border block h-5 w-9 flex-none border border-solid border-foreground", className)}>
      <span
        className="absolute inset-y-[3px] bg-foreground"
        style={{
          insetInlineStart: on ? "calc(50% + 1px)" : 3,
          insetInlineEnd: on ? 3 : "calc(50% + 1px)",
          transition: on ? `inset-inline-end ${glide}, inset-inline-start ${glide} 85ms` : `inset-inline-start ${glide}, inset-inline-end ${glide} 85ms`,
        }}
      />
    </span>
  );
}
```

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.
