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

- id: `help-search` · 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/help-search.json`
- npm dependencies: class-variance-authority@^0.7
- registry dependencies: utils, @beautiful-ui/segmented-control, https://beautiful-ui.dev/r/notchset-foundation.json
- docs: https://beautiful-ui.dev/components/help-search
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

A help-centre search: a big combobox (/ focuses it, Esc clears it), popular searches, a kind filter with a rolling count, a quick answer when the query matches a known intent, results grouped by kind in folds with matched words marked, and a preview with the excerpt, a code sample, open and copy-link; no results offers ask the team.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: `class-variance-authority@^0.7`.
- Files: `components/ui/notchset/blocks/help-search.tsx`; shared code: `lib/beautiful-ui/notchset/instrument.tsx`, `lib/beautiful-ui/notchset/root.ts`, `lib/beautiful-ui/notchset/button-variants.ts`.
- 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: `HelpSearch`, 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 { HelpSearch, type HelpDoc } from "@/components/ui/notchset/blocks/help-search";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `HelpSearch` | `help-search` | Search, filters, results and preview. |

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/help-search.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
- help center, help centre, docs search, knowledge base, support search, search articles, self serve, Notchset
- The front page of a help centre
- Deflecting tickets with answers people can find themselves

### Not when
- Searching product data: use Command Palette
- A short FAQ: use FAQ

## Mistakes
- Keep quick answers short and link to the article they come from
- Search on the server for large help centres and pass the results as docs

## Usage

```tsx
import { HelpSearch, type HelpDoc } from "@/components/ui/notchset/blocks/help-search";

export function Help({ docs }: { docs: HelpDoc[] }) {
  return <HelpSearch eyebrow="ACME HELP CENTER" docs={docs} popular={["billing", "sso"]} />;
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `docs` | `{ id, kind, title, meta, excerpt, code?, href }[]` |  | kind is "guide", "api" or "changelog"; results group by it. |
| `answers` | `{ keywords, text, source }[]` |  | A quick answer shows when the query contains one of its keywords. |
| `popular / defaultQuery` | `string[] / string` |  | Chips that fill the search, and where it starts. |
| `onOpen` | `(doc) => void` |  | Open a result; defaults to following its href. |
| `onAskTeam` | `(query) => Promise` |  | Adds ASK THE TEAM to the no-results state. |

Full docs: https://beautiful-ui.dev/components/help-search

## 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 |
|---|---|
| / | Focus the search from anywhere |
| ↑ ↓ / Enter / Esc | Move, open, clear |
| ← → | Change the filter |

## Performance

- Ranking runs in memory on each keystroke; fine for a few hundred documents.

## Responsive

- Under 720px (container width) the preview moves under the results; key hints hide under 560px.

## Motion inventory

| Interaction | What moves |
|---|---|
| Results | Rise in 30ms apart; the selected row's bar scales in |
| Quick answer | Rises in when the intent matches |
| Groups | Unroll in 380ms and fold in 260ms |

## Accessibility contract (preserve when editing)
- The search is a combobox over a listbox with an active option (aria-activedescendant); groups are labelled
- Group folds are buttons with aria-expanded; ↑ ↓ skip folded groups
- The count, the preview and the status line are announced as they change

## Install

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

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

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

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

Or add the `@beautiful-ui` registry to components.json and run `npx shadcn@latest add @beautiful-ui/help-search`: 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/help-search.tsx

```tsx
"use client";

import * as React from "react";
import { cn } from "@/lib/utils";
import { buttonVariants } from "@/lib/beautiful-ui/notchset/button-variants";
import { SegmentedControl } from "@/components/ui/notchset/segmented-control";
import { NOTCHSET_ROOT, OWN_SOUND, RollingNumber, copyText, playCue } from "@/lib/beautiful-ui/notchset/instrument";

/*
 * Notchset Help Search (a block, one file for both builds). Self-serve answers before anyone files a
 * ticket: a big search combobox (/ focuses it, Esc clears it), popular searches, a kind filter and a
 * rolling count, a QUICK ANSWER when the query matches a known intent, results grouped by kind in folds
 * (↑ ↓ skip folded groups) with the matched words marked, and a preview with the excerpt, a code sample
 * for API items, open and copy-link. No results offers CLEAR SEARCH and ASK THE TEAM.
 */

export type HelpDocKind = "guide" | "api" | "changelog";
export type HelpDoc = { id: string; kind: HelpDocKind; title: string; meta: string; excerpt: string; code?: string; href: string };
export type HelpAnswer = { keywords: readonly string[]; text: string; source: string };

export type HelpSearchProps = Omit<React.ComponentProps<"section">, "children" | "title"> & {
  /** The line above the title, e.g. RELAY HELP CENTER · 214 ARTICLES. */
  eyebrow?: string;
  title?: string;
  docs: readonly HelpDoc[];
  /** Quick answers: shown when the query contains one of the keywords. */
  answers?: readonly HelpAnswer[];
  popular?: readonly string[];
  defaultQuery?: string;
  /** Open a result; defaults to following its href. */
  onOpen?: (doc: HelpDoc) => void;
  /** Adds ASK THE TEAM when nothing matches; resolve once the request is sent. */
  onAskTeam?: (query: string) => Promise<unknown>;
  /** Make links absolute for COPY LINK (default: this page's origin). */
  origin?: string;
};

const KINDS: readonly { kind: HelpDocKind; filter: string; group: string }[] = [
  { kind: "guide", filter: "GUIDES", group: "GUIDES" },
  { kind: "api", filter: "API", group: "API REFERENCE" },
  { kind: "changelog", filter: "CHANGELOG", group: "CHANGELOG" },
];
const small = "font-mono text-[12px] tracking-[0.04em] whitespace-nowrap";
const escape = (s: string) => s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");

function Marked({ text, words }: { text: string; words: readonly string[] }) {
  if (!words.length) return <>{text}</>;
  const re = new RegExp(`(${words.map(escape).join("|")})`, "ig");
  return (
    <>
      {text.split(re).map((part, i) =>
        i % 2 ? (
          <mark key={i} className="bg-[var(--notchset-faceplate,var(--muted))] font-bold text-inherit">
            {part}
          </mark>
        ) : (
          part
        ),
      )}
    </>
  );
}

function HelpSearch({ eyebrow, title = "How can we help?", docs, answers = [], popular = [], defaultQuery = "", onOpen, onAskTeam, origin, className, ...props }: HelpSearchProps) {
  const [query, setQuery] = React.useState(defaultQuery);
  const [filter, setFilter] = React.useState("all");
  const [cursor, setCursor] = React.useState(0);
  const [closed, setClosed] = React.useState<ReadonlySet<HelpDocKind>>(() => new Set());
  const [copied, setCopied] = React.useState(false);
  const [asked, setAsked] = React.useState(false);
  const [status, setStatus] = React.useState("");
  const [seenQuery, setSeenQuery] = React.useState(query);
  const root = React.useRef<HTMLElement>(null);
  const input = React.useRef<HTMLInputElement>(null);
  const copyTimer = React.useRef<ReturnType<typeof setTimeout>>(undefined);
  const listId = React.useId();
  // A new query starts at the top again.
  if (seenQuery !== query) {
    setSeenQuery(query);
    setCursor(0);
    setCopied(false);
    setStatus("");
  }
  React.useEffect(() => {
    // "/" focuses the search from anywhere on the page, unless you are typing somewhere else.
    const onKey = (e: KeyboardEvent) => {
      const el = document.activeElement as HTMLElement | null;
      if (e.key !== "/" || el === input.current || el?.closest("input,textarea,[contenteditable=true]")) return;
      e.preventDefault();
      input.current?.focus();
    };
    document.addEventListener("keydown", onKey);
    return () => {
      document.removeEventListener("keydown", onKey);
      clearTimeout(copyTimer.current);
    };
  }, []);

  const q = query.trim().toLowerCase();
  const words = q.split(/\s+/).filter((w) => w.length > 1);
  const score = (d: HelpDoc) => {
    if (!words.length) return 1;
    const hay = `${d.title} ${d.excerpt} ${d.meta}`.toLowerCase();
    if (!words.every((w) => hay.includes(w) || w.length < 3)) return 0;
    return words.reduce((n, w) => n + (d.title.toLowerCase().includes(w) ? 3 : hay.includes(w) ? 1 : 0), 0);
  };
  const ranked = docs
    .map((d) => ({ d, s: score(d) }))
    .filter((r) => r.s > 0 && (filter === "all" || r.d.kind === filter))
    .sort((a, b) => b.s - a.s);
  // Flat in group order, so ↑ ↓ follow what you see.
  const flat = KINDS.flatMap((k) => ranked.filter((r) => r.d.kind === k.kind).map((r) => r.d));
  const index = Math.min(cursor, Math.max(0, flat.length - 1));
  const sel = flat[index];
  const answer = q ? answers.find((a) => a.keywords.some((k) => q.includes(k.toLowerCase()))) : undefined;
  const optionId = (d: HelpDoc) => `${listId}-${d.id}`;
  const open = (d: HelpDoc) => {
    playCue(root.current, "done");
    setStatus(`→ OPENING ${d.title.toUpperCase()}`);
    if (onOpen) onOpen(d);
    else if (typeof window !== "undefined") window.location.assign(d.href);
  };
  const move = (dir: 1 | -1) => {
    // Folded groups are skipped.
    const shown = flat.map((d, i) => ({ d, i })).filter(({ d }) => !closed.has(d.kind));
    const at = shown.findIndex(({ i }) => i === index);
    const next = shown[Math.max(0, Math.min(shown.length - 1, at + dir))];
    if (next) setCursor(next.i);
  };
  const clear = () => {
    playCue(root.current, "tick");
    setQuery("");
    input.current?.focus();
  };

  return (
    <section {...NOTCHSET_ROOT} ref={root} data-slot="help-search" aria-label={title} className={cn("@container box-border border border-solid border-foreground bg-background text-foreground", className)} {...props}>
      <div className="flex flex-col gap-3.5 px-6 pt-6 pb-5 @max-[560px]:px-4">
        {eyebrow && <span className={cn(small, "whitespace-normal text-muted-foreground")}>{eyebrow}</span>}
        <h2 className="m-0 text-[clamp(30px,8cqi,40px)] leading-[0.9] font-extrabold uppercase [font-stretch:62%]">{title}</h2>
        <label className="box-border flex h-[52px] items-center gap-3 border border-solid border-foreground bg-[var(--notchset-field,var(--background))] px-3.5">
          <svg aria-hidden width="18" height="18" viewBox="0 0 18 18" className="flex-none">
            <circle cx="7.6" cy="7.6" r="5.6" fill="none" className="stroke-current" strokeWidth="1.4" />
            <path d="M11.8 11.8 L16 16" className="stroke-current" strokeWidth="1.4" />
          </svg>
          <input
            ref={input}
            role="combobox"
            aria-expanded
            aria-controls={KINDS.map((k) => `${listId}-${k.kind}`).join(" ")}
            aria-activedescendant={sel ? optionId(sel) : undefined}
            aria-label="Search help"
            value={query}
            onChange={(e) => setQuery(e.target.value)}
            onKeyDown={(e) => {
              if (e.key === "ArrowDown" || e.key === "ArrowUp") {
                e.preventDefault();
                move(e.key === "ArrowDown" ? 1 : -1);
              } else if (e.key === "Enter" && sel) {
                e.preventDefault();
                open(sel);
              } else if (e.key === "Escape") {
                e.preventDefault();
                setQuery("");
              }
            }}
            placeholder="Search guides, API and changelog"
            spellCheck={false}
            className="min-w-0 flex-1 border-0 bg-transparent text-[16px] text-foreground outline-none placeholder:text-muted-foreground"
          />
          {query && (
            <button
              {...OWN_SOUND}
              type="button"
              aria-label="Clear search"
              onClick={clear}
              className={cn(`notchset-focus`, "size-7 flex-none cursor-pointer border-0 bg-transparent p-0 text-[18px] leading-none text-muted-foreground hover:text-foreground [--notchset-focus-inset:-3px]")}
            >
              ×
            </button>
          )}
          <kbd aria-hidden className="flex h-6 items-center border border-solid border-[var(--notchset-rule,var(--border))] px-1.5 font-mono text-[12px] text-muted-foreground @max-[420px]:hidden">
            /
          </kbd>
        </label>
        {popular.length > 0 && (
          <div className="flex flex-wrap items-center gap-1.5">
            <span className={cn(small, "me-1 text-muted-foreground")}>POPULAR</span>
            {popular.map((p) => {
              const on = q === p.toLowerCase();
              return (
                <button
                  key={p}
                  {...OWN_SOUND}
                  type="button"
                  aria-pressed={on}
                  onClick={() => {
                    playCue(root.current, "tick");
                    setQuery(p);
                  }}
                  className={cn(`notchset-focus`, "h-7 cursor-pointer border border-solid px-2.5 font-mono text-[12px] whitespace-nowrap [--notchset-focus-inset:-3px]", on ? "border-foreground bg-foreground text-background" : "border-[var(--notchset-rule,var(--border))] bg-background text-foreground hover:border-foreground")}
                >
                  {p}
                </button>
              );
            })}
          </div>
        )}
      </div>
      <div className="flex flex-wrap items-center justify-between gap-3 border-0 border-y border-solid border-foreground px-6 py-2.5 @max-[560px]:px-4">
        <SegmentedControl
          aria-label="Filter"
          size="sm"
          segment={72}
          options={[{ value: "all", label: "ALL" }, ...KINDS.map((k) => ({ value: k.kind, label: k.filter }))]}
          value={filter}
          onValueChange={(v) => {
            setFilter(v);
            setCursor(0);
          }}
        />
        <span aria-live="polite" className={cn(small, "flex items-center gap-1 text-muted-foreground")}>
          <RollingNumber value={flat.length} height={14} className="text-foreground" /> {q ? (flat.length === 1 ? "RESULT" : "RESULTS") : "ARTICLES"}
        </span>
      </div>
      <div className="grid grid-cols-[minmax(0,1fr)_minmax(0,1fr)] @max-[720px]:grid-cols-1">
        <div id={listId} className="min-w-0 border-0 border-e border-solid border-[var(--notchset-rule,var(--border))] @max-[720px]:border-e-0 @max-[720px]:border-b">
          {answer && filter !== "api" && (
            <div key={answer.source} className="m-4 mb-1 flex flex-col gap-1.5 border border-solid border-foreground bg-[var(--notchset-field,var(--muted))] p-3.5 motion-safe:animate-[notchset-rise_360ms_var(--notchset-ease-settle)]">
              <span className={cn(small, "font-medium")}>QUICK ANSWER</span>
              <span className="text-[14px] leading-[1.5]">{answer.text}</span>
              <span className={cn(small, "whitespace-normal text-muted-foreground")}>FROM · {answer.source}</span>
            </div>
          )}
          {KINDS.map((k) => {
            const items = flat.filter((d) => d.kind === k.kind);
            if (!items.length) return null;
            const isOpen = !closed.has(k.kind);
            return (
              <div key={k.kind} role="group" aria-label={k.group}>
                <button
                  {...OWN_SOUND}
                  type="button"
                  aria-expanded={isOpen}
                  onClick={() => {
                    playCue(root.current, "tick");
                    setClosed((s) => {
                      const n = new Set(s);
                      if (n.has(k.kind)) n.delete(k.kind);
                      else n.add(k.kind);
                      return n;
                    });
                  }}
                  className={cn(`notchset-focus`, "flex h-10 w-full cursor-pointer items-center gap-2 border-0 bg-transparent px-4 text-start font-mono text-[12px] font-medium tracking-[0.06em] text-foreground [--notchset-focus-inset:-3px]")}
                >
                  <span className="flex-1">{k.group}</span>
                  <span className="font-normal text-muted-foreground">{items.length}</span>
                  <svg aria-hidden width="12" height="12" viewBox="0 0 12 12" className={cn("transition-[rotate] duration-300 ease-(--notchset-ease-unfold)", isOpen && "rotate-180")}>
                    <path d="M2.5 4.5 L6 8 L9.5 4.5" fill="none" className="stroke-current" strokeWidth="1.4" />
                  </svg>
                </button>
                <div className={cn("grid grid-cols-[minmax(0,1fr)] transition-[grid-template-rows]", isOpen ? "grid-rows-[1fr] duration-[380ms] ease-(--notchset-ease-unfold)" : "grid-rows-[0fr] duration-[260ms] ease-(--notchset-ease-fold)")}>
                  <div id={`${listId}-${k.kind}`} role="listbox" aria-label={k.group} className="min-h-0 overflow-hidden">
                    {items.map((d) => {
                      const i = flat.indexOf(d);
                      const on = i === index;
                      return (
                        <div
                          key={`${query}-${filter}-${d.id}`}
                          id={optionId(d)}
                          role="option"
                          aria-selected={on}
                          onClick={() => {
                            playCue(root.current, "tick");
                            setCursor(i);
                          }}
                          onMouseEnter={() => setCursor(i)}
                          className={cn("relative flex cursor-pointer flex-col gap-1 px-4 py-2.5 transition-colors duration-[120ms] motion-safe:animate-[notchset-rise_300ms_var(--notchset-ease-settle)_both]", on ? "bg-[var(--notchset-field,var(--muted))]" : "bg-transparent")}
                          style={{ animationDelay: `${Math.min(i, 6) * 30}ms` }}
                        >
                          <span aria-hidden className={cn("absolute inset-y-0 start-0 w-0.5 origin-top bg-foreground transition-[scale] duration-[260ms] ease-(--notchset-ease-unfold)", on ? "scale-y-100" : "scale-y-0")} />
                          <span className="text-[15px] leading-[1.35]">
                            <Marked text={d.title} words={words} />
                          </span>
                          <span className={cn(small, "text-muted-foreground")}>{d.meta}</span>
                        </div>
                      );
                    })}
                  </div>
                </div>
              </div>
            );
          })}
          {flat.length === 0 && (
            <div className="flex flex-col gap-2 p-5">
              <span className="text-[16px] font-semibold">No results for “{query.trim()}”</span>
              <span className="text-[14px] leading-[1.5] text-muted-foreground">Try fewer words{onAskTeam ? ", or ask the team." : "."}</span>
              <span className="mt-1 flex flex-wrap gap-2">
                <button {...OWN_SOUND} type="button" onClick={clear} className={cn(`notchset-focus`, buttonVariants({ variant: "outline", size: "lg" }), "[--notchset-focus-inset:-3px]")}>
                  CLEAR SEARCH
                </button>
                {onAskTeam && (
                  <button
                    {...OWN_SOUND}
                    type="button"
                    onClick={async () => {
                      if (asked) return;
                      try {
                        await onAskTeam(query.trim());
                        playCue(root.current, "done");
                        setAsked(true);
                        setStatus("✓ WE’LL REPLY BY EMAIL");
                      } catch {
                        playCue(root.current, "signal");
                        setStatus("COULDN’T SEND · TRY AGAIN");
                      }
                    }}
                    className={cn(`notchset-focus`, buttonVariants({ variant: "default", size: "lg" }), "[--notchset-focus-inset:-3px]")}
                  >
                    {asked ? "✓ REQUEST SENT" : "ASK THE TEAM"}
                  </button>
                )}
              </span>
            </div>
          )}
        </div>
        <article aria-live="polite" className="min-w-0 p-5">
          {sel && (
            <div key={sel.id} className="flex flex-col gap-3 motion-safe:animate-[notchset-rise_300ms_var(--notchset-ease-settle)]">
              <span className={cn(small, "flex flex-wrap items-center gap-2 text-muted-foreground")}>
                <span className="border border-solid border-foreground px-1.5 font-medium text-foreground">{KINDS.find((k) => k.kind === sel.kind)?.filter}</span>
                {sel.meta}
              </span>
              <h3 className="m-0 text-[22px] leading-[1.2] font-semibold">{sel.title}</h3>
              <p className="m-0 text-[15px] leading-[1.6] text-muted-foreground [text-wrap:pretty]">
                <Marked text={sel.excerpt} words={words} />
              </p>
              {sel.code && <pre className="m-0 overflow-x-auto border border-solid border-[var(--notchset-rule,var(--border))] bg-[var(--notchset-field,var(--muted))] p-3 font-mono text-[12px] leading-[1.55]">{sel.code}</pre>}
              <span className="flex flex-wrap gap-2">
                <button {...OWN_SOUND} type="button" onClick={() => open(sel)} className={cn(`notchset-focus`, buttonVariants({ variant: "default", size: "lg" }), "[--notchset-focus-inset:-3px]")}>
                  {sel.kind === "api" ? "OPEN REFERENCE →" : "READ ARTICLE →"}
                </button>
                <button
                  {...OWN_SOUND}
                  type="button"
                  onClick={async () => {
                    const base = origin ?? (typeof window !== "undefined" ? window.location.origin : "");
                    const ok = await copyText(new URL(sel.href, base || "https://example.com").href);
                    playCue(root.current, ok ? "done" : "signal");
                    if (!ok) return;
                    setCopied(true);
                    clearTimeout(copyTimer.current);
                    copyTimer.current = setTimeout(() => setCopied(false), 1500);
                  }}
                  className={cn(`notchset-focus`, buttonVariants({ variant: "outline", size: "lg" }), "[--notchset-focus-inset:-3px]")}
                >
                  {copied ? "✓ LINK COPIED" : "COPY LINK"}
                </button>
              </span>
            </div>
          )}
        </article>
      </div>
      <div className={cn(small, "flex flex-wrap items-center gap-x-4 gap-y-1 border-0 border-t border-solid border-[var(--notchset-rule,var(--border))] px-6 py-2.5 text-muted-foreground @max-[560px]:px-4")}>
        <span className="@max-[560px]:hidden">↑ ↓ MOVE</span>
        <span className="@max-[560px]:hidden">↵ OPEN</span>
        <span className="@max-[560px]:hidden">/ FOCUS</span>
        <span className="@max-[560px]:hidden">ESC CLEARS</span>
        <span aria-live="polite" className="ms-auto truncate text-foreground">
          {status}
        </span>
      </div>
    </section>
  );
}

export { HelpSearch };
```

### 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/button-variants.ts

```tsx
import { cva } from "class-variance-authority";

/*
 * Notchset Button's variants, server-safe like shadcn's: call buttonVariants() from a Server Component
 * (links styled as buttons). The interactive Button lives in a client module.
 */

export const buttonVariants = cva(
  "group/button relative isolate inline-flex shrink-0 cursor-pointer items-center justify-center gap-(--b-gap) rounded-none border-0 font-mono font-medium tracking-[0.06em] whitespace-nowrap uppercase outline-none select-none transition-[background-color,color,translate,border-color] duration-[var(--notchset-fade),var(--notchset-fade),var(--notchset-key-up),var(--notchset-fade)] ease-[var(--notchset-ease-fade),var(--notchset-ease-fade),var(--notchset-ease-key-up),var(--notchset-ease-fade)] disabled:cursor-not-allowed disabled:opacity-40 aria-disabled:cursor-not-allowed aria-disabled:opacity-40 aria-busy:cursor-progress [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-(--b-ic) aria-pressed:bg-primary aria-pressed:text-primary-foreground data-[mode=armed]:bg-[var(--notchset-signal-text,var(--destructive))] data-[mode=armed]:text-primary-foreground data-[mode=hold]:translate-x-[2px] data-[mode=hold]:translate-y-[2px] data-[mode=hold]:duration-[var(--notchset-key-down)] data-[mode=hold]:ease-[var(--notchset-ease-key-down)]",
  {
    variants: {
      variant: {
        default: "bg-primary text-primary-foreground hover:bg-[var(--notchset-primary-hover,color-mix(in_oklab,var(--primary)_86%,var(--background)))] active:bg-[var(--notchset-primary-press,var(--primary))] [--b-tick:var(--notchset-tick-on-primary,color-mix(in_oklab,var(--primary-foreground)_34%,transparent))] [--b-kbd:var(--notchset-kbd-on-primary,color-mix(in_oklab,var(--primary-foreground)_45%,transparent))]",
        destructive:
          "bg-[var(--notchset-signal,var(--destructive))] text-[color:var(--notchset-on-signal,white)] hover:bg-[var(--notchset-signal-hover,var(--destructive))] active:bg-[var(--notchset-signal-press,var(--destructive))] [--b-tick:var(--notchset-tick-on-primary,color-mix(in_oklab,white_34%,transparent))] [--b-kbd:var(--notchset-kbd-on-signal,color-mix(in_oklab,black_40%,transparent))] [--notchset-focus-color:var(--notchset-signal-text,var(--destructive))]",
        outline: "border border-solid border-foreground bg-transparent text-foreground hover:bg-accent active:bg-[var(--notchset-tint-press,var(--accent))]",
        secondary: "bg-secondary text-secondary-foreground hover:bg-[var(--notchset-secondary-hover,var(--secondary))] active:bg-[var(--notchset-secondary-press,var(--secondary))]",
        signal:
          "border border-solid border-[var(--notchset-signal-text,var(--destructive))] bg-background text-[color:var(--notchset-signal-text,var(--destructive))] hover:bg-[var(--notchset-tint,color-mix(in_oklab,var(--destructive)_12%,var(--background)))] [--notchset-button-fill:color-mix(in_oklab,var(--notchset-signal,var(--destructive))_26%,var(--background))] [--notchset-button-meter:var(--notchset-signal,var(--destructive))] [--notchset-focus-color:var(--notchset-signal-text,var(--destructive))]",
        ghost: "bg-transparent text-foreground hover:bg-accent active:bg-[var(--notchset-tint-press,var(--accent))]",
        link: "h-auto min-w-0 justify-start bg-transparent px-0.5 pt-[3px] pb-1.5 text-foreground active:text-[var(--notchset-signal-text,var(--destructive))]",
        plate: "bg-primary text-primary-foreground hover:bg-[var(--notchset-primary-hover,color-mix(in_oklab,var(--primary)_86%,var(--background)))] active:translate-x-[2px] active:translate-y-[2px] active:duration-[var(--notchset-key-down)] active:ease-[var(--notchset-ease-key-down)]",
      },
      size: {
        // The market's heights (shadcn, and Kobra on it): XS 24, S 28, default 32, L 36. Labels are mono caps,
        // which read larger than the 14px sans those libraries use, so 12px (13px on L) matches them optically.
        // Same size names as shadcn, so it stays a drop-in. At least 44px tall on touch screens.
        default: "h-8 min-w-8 px-3 text-[12px] [--b-gap:8px] [--b-ic:16px] [--b-kh:18px] [--b-kfs:10px] pointer-coarse:min-h-11",
        xs: "h-6 min-w-6 px-2 text-[12px] [--b-gap:6px] [--b-ic:14px] [--b-kh:14px] [--b-kfs:10px] pointer-coarse:min-h-11",
        sm: "h-7 min-w-7 px-2.5 text-[12px] [--b-gap:7px] [--b-ic:16px] [--b-kh:16px] [--b-kfs:10px] pointer-coarse:min-h-11",
        lg: "h-9 min-w-9 px-4 text-[13px] [--b-gap:8px] [--b-ic:16px] [--b-kh:20px] [--b-kfs:10px] pointer-coarse:min-h-11",
        icon: "size-8 [--b-ic:16px]",
        "icon-xs": "size-6 [--b-ic:14px]",
        "icon-sm": "size-7 [--b-ic:16px]",
        "icon-lg": "size-9 [--b-ic:16px]",
      },
    },
    // The link's drawn rule lives in the Notchset foundation (a system class, kept out of the utilities).
    // The shared press (a 1px content dip) on every variant but plate, which moves whole onto its plate.
    compoundVariants: [
      { variant: "link", class: `notchset-link` },
      { variant: ["default", "destructive", "outline", "secondary", "signal", "ghost", "link"], class: `notchset-press` },
    ],
    defaultVariants: { variant: "default", size: "default" },
  },
);

export type ButtonVariant = NonNullable<Parameters<typeof buttonVariants>[0]>["variant"];
export type ButtonSize = NonNullable<Parameters<typeof buttonVariants>[0]>["size"];
```

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.