# Expanded Search (Notchset): prompt.md (v1.0.0)

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

An app bar whose search key widens across the whole bar as the nav slides away, with a results sheet that unrolls below in scopes with live counts, grouped results and underlined matches.

## 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/search-expand.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: `SearchExpand`, 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-sheet-from`, `--notchset-signal`, `--notchset-sweep-to`, `--notchset-travel`). Never add Tailwind colour classes inside the component.

```tsx
import { SearchExpand, type SearchExpandGroup } from "@/components/ui/notchset/search-expand";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `SearchExpand` | `search-expand-frame` | The frame. |
| `key` | `search-expand` | The widening key. |

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://notchset.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/search-expand.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
- expanded search, global search, command search, app bar search, search everything, Notchset
- Product-wide search from an app bar: agents, runs, traces, docs

### Not when
- Picking one item from a known list: use Search Projects or Combobox

## Mistakes
- Keep result labels short: rows are one line

## Usage

```tsx
"use client";

import * as React from "react";
import { useRouter } from "next/navigation";
import { SearchExpand, type SearchExpandGroup } from "@/components/ui/notchset/search-expand";

export function AppBar({ children }: { children: React.ReactNode }) {
  const router = useRouter();
  // Each result says what choosing it does: here, open its page.
  const results: SearchExpandGroup[] = [
    { id: "agents", label: "AGENTS", items: [{ label: "Planner", meta: "PROD", onSelect: () => router.push("/agents/planner") }, { label: "Triage", meta: "STAGING", onSelect: () => router.push("/agents/triage") }] },
    { id: "runs", label: "RUNS", items: [{ label: "run_8f3a1", meta: "OK · 2.1S", onSelect: () => router.push("/runs/run_8f3a1") }, { label: "run_8f3a2", meta: "FAILED", tone: "signal", onSelect: () => router.push("/runs/run_8f3a2") }] },
  ];
  return (
    <SearchExpand
      nav={
        <nav className="flex gap-4 font-mono text-xs">
          <a href="/agents">AGENTS</a>
          <a href="/runs">RUNS</a>
        </nav>
      }
      groups={results}
    >
      {children}
    </SearchExpand>
  );
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `nav` | `ReactNode` |  | The bar's left side; it fades away while searching. |
| `groups` | `{ id, label, items: { label, meta?, tone?, hollow?, onSelect? }[] }[]` |  | Results by scope. |
| `children` | `ReactNode` |  | The page; it dims while searching. |
| `hotkey` | `string` |  | Opens search from anywhere (/). |

Full docs: https://notchset.dev/components/search-expand

## 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://notchset.dev/r/changelog.json

## Keyboard

| Keys | Action |
|---|---|
| / | Open |
| Esc | Close |
| Tab | Move through scopes and results |

## Performance

- The key widens and the sheet unrolls with CSS; results filter synchronously as you type.

## Responsive

- Fills the frame you give it; scopes scroll sideways if they run out of room, results scroll within the sheet.

## Motion inventory

| Interaction | What moves |
|---|---|
| Open | The key widens (420ms) as the nav slides away; the input fades in after 220ms; the sheet unrolls (400ms after 160ms); the page dims to 25% |
| Scope | The 2px underline scales in (300ms); groups settle in 60ms apart |
| Close | Everything reverses in 160–300ms |

## Accessibility contract (preserve when editing)
- The key is aria-expanded and controls the sheet; scopes are a tablist
- Esc, the ESC chip or a click outside closes it
- Results are buttons, reachable with Tab

## Install

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

```bash
npx shadcn@latest add https://notchset.dev/r/search-expand.json
```

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

```bash
npx shadcn@latest add https://notchset.dev/r/radix-nova/search-expand.json
```

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

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

## Source (Base UI build)

### components/ui/notchset/search-expand.tsx

```tsx
"use client";

/**
 * Expanded Search (Notchset) v1.0.0 · Notchset
 * Docs: https://notchset.dev/components/search-expand
 * MIT licensed: free to use, change and share.
 */

import * as React from "react";
import { cn } from "@/lib/utils";
import { NOTCHSET_ROOT, OWN_SOUND, playCue, motionOff, useHotkey } from "@/lib/beautiful-ui/notchset/instrument";

/*
 * Notchset Expanded Search (no primitive, one file for both builds). An app frame whose
 * 40px search key widens across the whole bar (420ms) as the nav fades and slides away; the input and
 * an ESC chip fade in after 220ms and take focus, and a results sheet unrolls under the bar (400ms
 * after 160ms) while the page dims to a quarter. Scopes (ALL and one per group) carry live counts and
 * a 2px underline; groups fade in 60ms apart; matches are underlined. `/` opens it from anywhere; Esc,
 * the chip or a click outside closes it.
 */

export type SearchExpandItem = { label: string; meta?: string; tone?: "default" | "signal"; hollow?: boolean; onSelect?: () => void };
export type SearchExpandGroup = { id: string; label: string; items: readonly SearchExpandItem[] };

function Match({ text, q }: { text: string; q: string }) {
  const i = q ? text.toLowerCase().indexOf(q.toLowerCase()) : -1;
  if (i < 0) return <>{text}</>;
  return (
    <>
      {text.slice(0, i)}
      <span className="underline decoration-1 underline-offset-[3px]">{text.slice(i, i + q.length)}</span>
      {text.slice(i + q.length)}
    </>
  );
}

function SearchExpand({
  nav,
  groups,
  children,
  placeholder = "Search",
  label = "Search",
  allLabel = "ALL",
  hotkey = "/",
  empty = (q, scope) => `Nothing for “${q}” in ${scope}`,
  emptyHint = "SWITCH SCOPE TO ALL, OR TRY ANOTHER WORD",
  className,
}: {
  /** The bar's left side (brand and nav); it fades away while searching. */
  nav?: React.ReactNode;
  groups: readonly SearchExpandGroup[];
  /** The page under the bar; it dims while searching. */
  children?: React.ReactNode;
  placeholder?: string;
  label?: string;
  allLabel?: string;
  /** Opens search from anywhere ("/"); empty to turn off. */
  hotkey?: string;
  empty?: (query: string, scope: string) => React.ReactNode;
  emptyHint?: React.ReactNode;
  className?: string;
}) {
  const uid = React.useId();
  const frame = React.useRef<HTMLDivElement>(null);
  const input = React.useRef<HTMLInputElement>(null);
  const [open, setOpen] = React.useState(false);
  const [q, setQ] = React.useState("");
  const [scope, setScope] = React.useState("all");
  const [run, setRun] = React.useState(0);

  const opener = React.useRef<HTMLElement | null>(null);
  const focusTimer = React.useRef<ReturnType<typeof setTimeout>>(undefined);
  React.useEffect(() => () => clearTimeout(focusTimer.current), []);
  const show = React.useCallback(() => {
    if (!open) {
      playCue(frame.current, "tick");
      setRun((r) => r + 1);
      setOpen(true);
      opener.current = document.activeElement as HTMLElement | null;
    }
    // The input takes focus as it fades in (at once with motion off); closing first cancels it.
    clearTimeout(focusTimer.current);
    focusTimer.current = setTimeout(() => input.current?.focus({ preventScroll: true }), motionOff(frame.current) ? 0 : 240);
  }, [open]);
  const hide = React.useCallback(() => {
    clearTimeout(focusTimer.current);
    // Focus inside the closing sheet goes back to what opened it (else the field).
    if (frame.current?.contains(document.activeElement)) (opener.current?.isConnected ? opener.current : input.current)?.focus({ preventScroll: true });
    setOpen(false);
    setQ("");
  }, []);

  useHotkey(hotkey || undefined, show);
  React.useEffect(() => {
    if (!open) return;
    const onDown = (e: PointerEvent) => {
      if (!frame.current?.contains(e.target as Node)) hide();
    };
    document.addEventListener("pointerdown", onDown);
    return () => document.removeEventListener("pointerdown", onDown);
  }, [open, hide]);

  const query = q.trim().toLowerCase();
  const matches = (g: SearchExpandGroup) => g.items.filter((it) => !query || it.label.toLowerCase().includes(query));
  const shown = groups.filter((g) => scope === "all" || scope === g.id).map((g) => ({ g, items: matches(g) })).filter((x) => x.items.length);
  const scopes = [{ id: "all", label: allLabel, n: groups.reduce((n, g) => n + matches(g).length, 0) }, ...groups.map((g) => ({ id: g.id, label: g.label, n: matches(g).length }))];
  const scopeLabel = scopes.find((s) => s.id === scope)?.label.toLowerCase() ?? "";

  return (
    <div
      {...NOTCHSET_ROOT}
      ref={frame}
      data-slot="search-expand-frame"
      // Escape closes from anywhere inside (the scopes, a result), not only the input.
      onKeyDown={(e) => {
        if (open && e.key === "Escape" && !e.defaultPrevented) {
          e.preventDefault();
          hide();
        }
      }}
      data-state={open ? "open" : "closed"}
      // Open, the frame keeps room for results even when it wraps nothing below the bar.
      className={cn("relative overflow-hidden border border-solid border-foreground bg-background text-foreground", open && "min-h-[320px]", className)}
    >
      <div className="relative h-14 border-b border-solid border-foreground">
        <div
          aria-hidden={open || undefined}
          inert={open || undefined}
          className={cn(
            "absolute inset-y-0 start-0 end-14 flex items-center gap-[18px] ps-4 transition-[opacity,translate]",
            open
              ? "-translate-x-2 opacity-0 duration-[120ms,240ms] ease-[linear,var(--notchset-ease-travel)] rtl:translate-x-2"
              : "translate-x-0 opacity-100 delay-200 duration-[200ms,380ms] ease-[linear,cubic-bezier(.34,1.3,.5,1)]",
          )}
        >
          {nav}
        </div>
        <div
          data-slot="search-expand"
          className={cn(
            "absolute end-2 top-2 flex h-10 items-center overflow-hidden border border-solid transition-[width,border-color]",
            open
              ? "w-[calc(100%-16px)] border-foreground bg-[var(--notchset-faceplate,var(--card))] duration-[420ms,120ms] ease-[var(--notchset-ease-unfold),linear]"
              : "w-10 border-[var(--notchset-rule,var(--border))] bg-background delay-[60ms] duration-[300ms,120ms] ease-[var(--notchset-ease-travel),linear] hover:border-foreground",
          )}
        >
          <button
            {...OWN_SOUND}
            type="button"
            aria-label={label}
            aria-expanded={open}
            aria-controls={`${uid}-sheet`}
            onClick={show}
            className={cn(`notchset-focus`, "[--notchset-focus-inset:-4px] flex size-[38px] flex-none cursor-pointer items-center justify-center border-0 bg-transparent p-0 text-foreground")}
          >
            <svg aria-hidden width="14" height="14" viewBox="0 0 13 13">
              <circle cx="5.5" cy="5.5" r="4.2" fill="none" stroke="currentColor" strokeWidth="1.2" />
              <path fill="none" d="M8.6 8.6 L12 12" stroke="currentColor" strokeWidth="1.2" />
            </svg>
          </button>
          <input
            ref={input}
            tabIndex={open ? 0 : -1}
            aria-label={label}
            value={q}
            placeholder={placeholder}
            spellCheck={false}
            onChange={(e) => setQ(e.target.value)}
            onKeyDown={(e) => {
              if (e.key === "Escape") {
                e.preventDefault();
                hide();
              }
            }}
            className={cn(
              "h-full min-w-0 flex-1 border-0 bg-transparent p-0 font-sans text-[13px] text-foreground outline-none placeholder:text-muted-foreground",
              open ? "opacity-100 transition-opacity delay-[220ms] duration-[160ms] ease-linear" : "opacity-0 transition-opacity duration-(--notchset-fade) ease-(--notchset-ease-fade)",
            )}
          />
          <button
            {...OWN_SOUND}
            type="button"
            tabIndex={open ? 0 : -1}
            aria-label="Close search"
            onClick={(e) => {
              playCue(e.currentTarget, "tick");
              hide();
            }}
            className={cn(
              `notchset-focus`,
              "[--notchset-focus-inset:-3px] me-[7px] flex h-6 flex-none cursor-pointer items-center border border-solid border-[var(--notchset-rule,var(--border))] bg-transparent px-1.5 font-mono text-[10px] tracking-[0.06em] text-muted-foreground",
              open ? "opacity-100 transition-opacity delay-[220ms] duration-[160ms] ease-linear" : "opacity-0 transition-opacity duration-(--notchset-fade) ease-(--notchset-ease-fade)",
            )}
          >
            ESC
          </button>
        </div>
      </div>
      {/* While the sheet is over it, the page underneath can't be reached by Tab or assistive tech. */}
      <div aria-hidden={open || undefined} inert={open || undefined} className={cn("transition-opacity duration-(--notchset-fade) ease-(--notchset-ease-fade)", open && "opacity-25")}>
        {children}
      </div>
      <div
        id={`${uid}-sheet`}
        aria-hidden={!open || undefined}
        inert={!open || undefined}
        className={cn(
          "absolute inset-x-0 top-14 bottom-0 flex flex-col bg-background transition-[clip-path,visibility]",
          open ? "visible [clip-path:inset(0)] delay-[160ms] duration-[400ms] ease-[var(--notchset-ease-unfold)]" : "invisible [clip-path:inset(0_0_100%_0)] duration-[160ms] ease-[var(--notchset-ease-travel)]",
        )}
      >
        <div role="group" aria-label="Search scope" className="flex h-9 flex-none gap-4 border-b border-solid border-[var(--notchset-rule,var(--border))] px-4">
          {scopes.map((s) => {
            const on = s.id === scope;
            return (
              <button
                key={s.id}
                {...OWN_SOUND}
                type="button"
                aria-pressed={on}
                onClick={(e) => {
                  playCue(e.currentTarget, "tick");
                  setScope(s.id);
                  setRun((r) => r + 1);
                }}
                className={cn(
                  `notchset-focus`,
                  "[--notchset-focus-inset:-2px] relative flex h-9 cursor-pointer items-center gap-[5px] border-0 bg-transparent p-0 font-mono text-[11px] font-medium tracking-[0.09em] whitespace-nowrap transition-colors duration-(--notchset-fade) ease-(--notchset-ease-fade)",
                  on ? "text-foreground" : "text-muted-foreground hover:text-foreground",
                )}
              >
                {s.label}
                <span className="text-[10px] font-normal text-muted-foreground tabular-nums">{s.n}</span>
                <span
                  aria-hidden
                  className={cn("absolute inset-x-0 -bottom-px h-0.5 origin-left bg-foreground transition-transform duration-300 ease-[cubic-bezier(.34,1.3,.5,1)] rtl:origin-right", on ? "scale-x-100" : "scale-x-0")}
                />
              </button>
            );
          })}
        </div>
        <div className="flex-1 overflow-y-auto pt-1 pb-2 [scrollbar-width:none]" role="region" aria-label="Results" aria-live="polite">
          {shown.map(({ g, items }, k) => (
            <div
              key={`${run}-${g.id}`}
              className="motion-safe:animate-[notchset-fade-in_180ms_linear_both,notchset-settle_380ms_cubic-bezier(.34,1.4,.5,1)_both]"
              style={{ animationDelay: `${300 + k * 60}ms` }}
            >
              <div className="flex h-[26px] items-end px-4 pb-[5px] font-mono text-[10px] tracking-[0.14em] text-muted-foreground">
                {g.label} · {items.length}
              </div>
              {items.map((it) => (
                <button
                  key={it.label}
                  {...OWN_SOUND}
                  type="button"
                  onClick={(e) => {
                    playCue(e.currentTarget, "tick");
                    it.onSelect?.();
                  }}
                  className={cn(
                    `notchset-focus`,
                    "[--notchset-focus-inset:-2px] flex h-10 w-full cursor-pointer items-center gap-[11px] border-0 bg-transparent px-4 text-start text-foreground transition-[background-color] duration-(--notchset-fade) ease-(--notchset-ease-fade) hover:bg-[var(--notchset-faceplate,var(--card))] focus-visible:bg-[var(--notchset-faceplate,var(--card))]",
                  )}
                >
                  <svg aria-hidden width="9" height="9" viewBox="0 0 9 9" className="flex-none overflow-visible">
                    <circle
                      cx="4.5"
                      cy="4.5"
                      r="3.5"
                      strokeWidth="1"
                      className={
                        it.tone === "signal"
                          ? "fill-[var(--notchset-signal,var(--destructive))] stroke-[var(--notchset-signal,var(--destructive))]"
                          : it.hollow
                            ? "fill-transparent stroke-foreground"
                            : "fill-foreground stroke-foreground"
                      }
                    />
                  </svg>
                  <span className="min-w-0 flex-1 truncate font-sans text-[13px] font-medium">
                    <Match text={it.label} q={query} />
                  </span>
                  {it.meta && (
                    <span className={cn("flex-none font-mono text-[10px] tracking-[0.04em] whitespace-nowrap", it.tone === "signal" ? "text-[var(--notchset-signal-text,var(--destructive))]" : "text-muted-foreground")}>
                      {it.meta}
                    </span>
                  )}
                </button>
              ))}
            </div>
          ))}
          {open && !shown.length && (
            <div className="flex flex-col gap-1 px-4 py-[18px]">
              <span className="font-sans text-[13px] font-medium">{empty(q.trim(), scopeLabel)}</span>
              <span className="font-mono text-[10px] tracking-[0.06em] text-muted-foreground">{emptyHint}</span>
            </div>
          )}
        </div>
      </div>
    </div>
  );
}

export { SearchExpand };
```

### 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;
```

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