{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "checkpoint",
  "type": "registry:ui",
  "title": "Checkpoint",
  "description": "A request that has to clear your rules before it runs. A token drops out from under the request and drives down a lane, past one barrier per rule: each one swings open downward, the way the token is going, as its rule passes and the row ticks. A rule that needs sign-off keeps its barrier down and turns its row into Approve and Deny; a rule the request breaks stays shut, and the token knocks against it twice and is turned away. Every outcome rolls into a short log underneath.",
  "author": "KeyframeUI <https://keyframeui.com>",
  "categories": [
    "ai",
    "interaction",
    "data"
  ],
  "docs": "Live preview, examples and props: https://keyframeui.com/components/checkpoint",
  "dependencies": [
    "clsx",
    "tailwind-merge"
  ],
  "registryDependencies": [
    "utils"
  ],
  "files": [
    {
      "path": "components/ui/checkpoint.tsx",
      "type": "registry:ui",
      "content": "\"use client\";\n\nimport * as React from \"react\";\n\nimport { cn } from \"@/lib/utils\";\n\n/**\n * Keep:\n * - One async runner owns every move: WAAPI keyframes on the `data-part` hooks, each end state\n *   written inline as it finishes. React only decides which row's Approve / Deny can be reached.\n * - Only transform and opacity move. A barrier swings down about its pivot, the way the token\n *   travels, so its tip stays clear of the token, and closes only once the token is past its reach.\n * - Approve / Deny float over the row's right end and stay `inert` unless that row holds, so a hold\n *   never moves the row or focus; a decision made from the keyboard leaves focus on the checkpoint.\n * - Off screen and on a hidden tab the runner waits between steps (`gate()`), and the approval\n *   timer and the waiting dot pause where they are.\n * - Under reduced motion there's no token, travel, lifting or knocking: each rule resolves with an\n *   opacity change and the barriers only change color.\n */\nconst TIMING = {\n  /** How fast each request plays, as a multiple of the pace below (the `speed` prop). */\n  speed: 1,\n  // At the default pace; `speed` divides everything from here down to `log`.\n  /** The token's leg from one barrier to the next, in ms. */\n  travel: 300,\n  /** A rule being read, row tinted, before its verdict, in ms. */\n  read: 160,\n  /** A barrier swinging open about its pivot, in ms. */\n  lift: 200,\n  /**\n   * A barrier closing, in ms, and ms into the token's next leg before it starts: by then the token\n   * is past the arm's 26px reach.\n   */\n  drop: { duration: 240, delay: 200 },\n  /** A status box filling, in ms. */\n  tick: 180,\n  /** The row's tint fading as its barrier lifts, in ms. */\n  untint: 200,\n  /** A held token easing up against the barrier, in ms. */\n  settle: 160,\n  /**\n   * A blocked token's two knocks, in ms. Linear overall, so each keyframe's own curve plays out on\n   * the clock.\n   */\n  knock: { duration: 260, easing: \"linear\" },\n  /** A turned-away token sliding out of the lane, in ms. */\n  away: 200,\n  /** The tag and the Approve / Deny buttons cross-fading, in ms. The status swaps on it unpaced. */\n  swap: 180,\n  /** The token fading into the log, in ms. */\n  tokenOut: 120,\n  /** Per box fading back, and between rows, last row first, in ms. */\n  reset: { duration: 120, stagger: 25 },\n  /** A new request sliding in from the left, and the old one fading, in ms. */\n  enter: { duration: 280, out: 120 },\n  /** A log line fading in while the older ones step down, in ms. */\n  log: 280,\n  // Not paced.\n  /**\n   * A hold waiting before it approves itself, with autoplay, in ms (the `approveAfter` prop), and\n   * the curve of the hairline that fills meanwhile.\n   */\n  approveAfter: 2400,\n  timer: \"linear\",\n  /** An outcome staying up before the next request, in ms (the `dwell` prop). */\n  dwell: 1600,\n  /** One cycle of a waiting box's dot, in ms, and its curve. */\n  breathe: { duration: 1400, easing: \"ease-in-out\" },\n  /** Between rules under reduced motion, in ms. */\n  reduced: 120,\n  /** Curves, as CSS easings. */\n  outEase: \"cubic-bezier(0.23, 1, 0.32, 1)\", // arrivals and lifts: all the speed up front\n  inOut: \"cubic-bezier(0.65, 0, 0.35, 1)\", // the token's legs: pulls away and pulls up\n  inEase: \"cubic-bezier(0.55, 0, 1, 0.45)\", // leaving, and a knock's run-up: the speed at the end\n  fade: \"linear\", // cross-fades, and every fade under reduced motion\n  /** A barrier and a row changing color, as a Tailwind class. */\n  colors: \"duration-150\",\n  /** Approve and Deny on hover, as a Tailwind class. */\n  hover: \"duration-150\",\n} as const;\n\n/* ─────────────────────────────────────────────────────────\n * CHECKPOINT STORYBOARD\n *\n *  rest     the request sits in a card at the top: its icon, its name\n *           in mono, who sent it and what it carries, and a status on\n *           the right. Under it, one row per rule, each with a boom\n *           barrier down across a narrow lane on its left. The\n *           request's icon, every barrier, the token and the log's\n *           icons all sit on that lane's center line\n *  view     once 30% of it is in view, the token drops out from under\n *           the request card and the first rule is read\n *  travel   the token glides down the lane to just above the next\n *           barrier, 300ms, in-out, like a car pulling up\n *  read     the row tints with the accent for 160ms and its barrier\n *           turns accent: the rule is being checked\n *  pass     the barrier swings 84° down about its pivot, the way the\n *           token is heading, like a door pushed open (200ms,\n *           ease-out), clear of the token's path, while the row's box\n *           fills with a check (180ms, from 0.7), and the token drives\n *           through. The barrier swings back up behind it once the\n *           token is past its reach, 200ms into its next leg (240ms)\n *  hold     a rule that needs sign-off keeps its barrier down. The\n *           token settles 2px closer to it, Approve / Deny fade in\n *           over the row's right end (180ms) and the status reads\n *           \"Waiting on approval\". With autoplay a hairline fills\n *           under Approve over `approveAfter` and it approves itself\n *           as `approver`; pointing at the buttons holds the timer.\n *           Approve swings the barrier open; Deny keeps it shut and sends\n *           the token away without a knock\n *  block    a rule it breaks stays shut. The token knocks into the\n *           barrier twice (4px, then 2px, 260ms), the barrier and the\n *           row's box go ink with a cross, the status reads \"Blocked ·\n *           <rule>\" and the token slides out of the lane, 14px, 200ms\n *  clear    past the last rule the token drives into the top line of\n *           the log and becomes its check: the new line fades in as\n *           the older lines step down one line (280ms), the oldest\n *           dropping out under the edge. The status reads \"Cleared\"\n *  next     1.6s later the boxes clear, last row first (120ms each,\n *           25ms apart), the old request fades and the next one slides\n *           in from 12px left (280ms). Requests loop with autoplay\n *  sleep    off screen and on a hidden tab it stops between steps, and\n *           an approval timer stops where it is\n *  keys     Approve and Deny are buttons, reachable only while a rule\n *           waits; a hold never moves focus. A decision made from the\n *           keyboard leaves focus on the checkpoint\n *  narrow   under 26rem the value tags hide, so the details keep\n *           their room, and the status shortens to one word\n *  reduced  no token, no travel, no lifting or knocking: each rule\n *           resolves 120ms after the last with an opacity change, the\n *           barriers stay down and only change color, and holds wait\n *           the same way\n * ───────────────────────────────────────────────────────── */\n\nconst GATE = {\n  view: 0.3, // share of the box in view before the first request runs\n  lane: 40, // px, the lane column; the icons, barriers and token sit on its center line\n  token: 12, // px, the token's side\n  gap: 4, // px between a waiting token and the barrier under it\n  lift: { angle: 84 }, // deg: a barrier swinging open about its pivot, downward, the way the token travels (84° keeps its tip ~3px clear of the token)\n  settle: { distance: 2 }, // px: a held token easing up against the barrier\n  knock: { distance: 4 }, // px: a blocked token's first knock (the second is half as far)\n  away: { distance: 14 }, // px: a turned-away token sliding out of the lane\n  enter: { distance: 12 }, // px a new request slides in from the left\n} as const;\n\nconst REDUCED = \"(prefers-reduced-motion: reduce)\";\nconst LOG_LINES = 3;\n\nconst subscribeReduced = (onChange: () => void) => {\n  const query = window.matchMedia(REDUCED);\n  query.addEventListener(\"change\", onChange);\n  return () => query.removeEventListener(\"change\", onChange);\n};\n\n/** prefers-reduced-motion, false on the server and in the hydration render. */\nfunction usePrefersReducedMotion() {\n  return React.useSyncExternalStore(\n    subscribeReduced,\n    () => window.matchMedia(REDUCED).matches,\n    () => false,\n  );\n}\n\nconst clock = () => new Date().toLocaleTimeString(\"en-GB\", { hour12: false });\n\nexport type CheckpointVerdict = \"pass\" | \"hold\" | \"block\";\n\nexport interface CheckpointRule {\n  /** Stable key, used by each request's `verdicts`. */\n  id: string;\n  /** The rule's name, e.g. \"Amount\". */\n  label: string;\n  /** One line under the name, e.g. \"Refunds over $500 need finance\". */\n  detail?: string;\n  /** A short value in a mono tag on the right, e.g. \"≤ $500\". */\n  value?: string;\n  /** A small glyph before the name, drawn in currentColor. */\n  icon?: React.ReactNode;\n}\n\nexport interface CheckpointRequest {\n  /** Stable key. */\n  id: string;\n  /** What's asking, in mono, e.g. \"refund_order\". */\n  label: string;\n  /** Who sent it and what it carries, e.g. \"$1,240 · support-bot\". */\n  meta?: string;\n  /** A glyph for the request card, drawn in the accent. */\n  icon?: React.ReactNode;\n  /** How each rule judges it, by rule id. A rule left out passes. */\n  verdicts?: Partial<Record<string, CheckpointVerdict>>;\n  /** Why it was blocked, shown in the status instead of the rule's name. */\n  reason?: string;\n}\n\nexport type CheckpointOutcome = \"cleared\" | \"blocked\" | \"denied\";\n\nexport interface CheckpointProps extends React.HTMLAttributes<HTMLDivElement> {\n  /** The rules, top to bottom, each with a barrier in the lane. */\n  rules: CheckpointRule[];\n  /** The requests that come through, in order. */\n  requests: CheckpointRequest[];\n  /** The id of the request to run. Set it to drive the checkpoint yourself: each change runs that request once. Leave it out and `autoplay` runs them in turn. */\n  current?: string;\n  /** Run the requests one after another and start over after the last. With `false` the first one runs once. Defaults to true. */\n  autoplay?: boolean;\n  /** Ms a rule that needs sign-off waits before it approves itself, or `false` to wait for the visitor. Only with autoplay. Defaults to 2400. */\n  approveAfter?: number | false;\n  /** Who signs off when a hold approves itself, as written in the log. Defaults to \"a reviewer\". */\n  approver?: string;\n  /** Show the last three outcomes under the rules. Defaults to true. */\n  log?: boolean;\n  /** Called when a request is settled, with the rule that stopped it. */\n  onDecision?: (requestId: string, outcome: CheckpointOutcome, ruleId?: string) => void;\n  /** How fast each request plays, as a multiple of the default pace: the token's legs, the barriers swinging, the rows ticking, a knock, the log line and the next request sliding in. `2` is twice as fast. Defaults to 1. */\n  speed?: number;\n  /** Ms an outcome stays up before the next request comes in, with autoplay. Defaults to 1600. */\n  dwell?: number;\n}\n\ntype Phase =\n  | { kind: \"queued\" }\n  | { kind: \"checking\" }\n  | { kind: \"hold\"; rule: string }\n  | { kind: \"cleared\" }\n  | { kind: \"blocked\"; rule: string }\n  | { kind: \"denied\"; rule: string };\n\ntype LogEntry = {\n  key: number;\n  ok: boolean;\n  label: string;\n  note: string;\n  time: string;\n};\n\n/* ── Glyphs ───────────────────────────────────────────────── */\n\nfunction Check({ className }: { className?: string }) {\n  return (\n    <svg viewBox=\"0 0 12 12\" aria-hidden className={className}>\n      <path\n        d=\"M2.6 6.3l2.2 2.2 4.6-4.9\"\n        fill=\"none\"\n        stroke=\"currentColor\"\n        strokeWidth=\"1.7\"\n        strokeLinecap=\"round\"\n        strokeLinejoin=\"round\"\n      />\n    </svg>\n  );\n}\n\nfunction Cross({ className }: { className?: string }) {\n  return (\n    <svg viewBox=\"0 0 12 12\" aria-hidden className={className}>\n      <path\n        d=\"M3.4 3.4l5.2 5.2M8.6 3.4l-5.2 5.2\"\n        fill=\"none\"\n        stroke=\"currentColor\"\n        strokeWidth=\"1.7\"\n        strokeLinecap=\"round\"\n      />\n    </svg>\n  );\n}\n\n/* ── Swap ─────────────────────────────────────────────────── */\n// Swaps a short line of text when its key changes: the old one lifts 4px out,\n// then the new one rises 4px in, so two lines never sit on top of each other.\n\nfunction Swap({\n  id,\n  children,\n  reduced,\n  className,\n}: {\n  id: string;\n  children: React.ReactNode;\n  reduced: boolean;\n  className?: string;\n}) {\n  const [shown, setShown] = React.useState<{\n    id: string;\n    node: React.ReactNode;\n  }>({ id, node: children });\n  const [leaving, setLeaving] = React.useState<{\n    id: string;\n    node: React.ReactNode;\n  } | null>(null);\n  if (shown.id !== id) {\n    setLeaving(shown);\n    setShown({ id, node: children });\n  }\n\n  const nextRef = React.useRef<HTMLSpanElement>(null);\n  const oldRef = React.useRef<HTMLSpanElement>(null);\n  const leavingId = leaving?.id;\n  React.useLayoutEffect(() => {\n    if (!leavingId) return;\n    const out = TIMING.swap * 0.5;\n    nextRef.current?.animate(\n      reduced\n        ? [{ opacity: 0 }, { opacity: 1 }]\n        : [\n            { opacity: 0, transform: \"translateY(4px)\" },\n            { opacity: 1, transform: \"none\" },\n          ],\n      {\n        duration: TIMING.swap,\n        delay: reduced ? out : out * 0.6,\n        easing: TIMING.outEase,\n        fill: \"backwards\",\n      },\n    );\n    const a = oldRef.current?.animate(\n      reduced\n        ? [{ opacity: 1 }, { opacity: 0 }]\n        : [\n            { opacity: 1, transform: \"none\" },\n            { opacity: 0, transform: \"translateY(-4px)\" },\n          ],\n      {\n        duration: out,\n        easing: TIMING.inEase,\n        fill: \"forwards\",\n      },\n    );\n    if (!a) return;\n    a.finished.then(\n      () => setLeaving((l) => (l?.id === leavingId ? null : l)),\n      () => {},\n    );\n    return () => a.cancel();\n  }, [leavingId, id, reduced]);\n\n  const cell = \"col-start-1 row-start-1 inline-flex items-center gap-1.5 whitespace-nowrap\";\n  return (\n    <span className={cn(\"relative inline-grid justify-items-end overflow-hidden py-0.5\", className)}>\n      {leaving ? (\n        <span key={leaving.id} ref={oldRef} aria-hidden className={cell}>\n          {leaving.node}\n        </span>\n      ) : null}\n      <span key={id} ref={nextRef} className={cell}>\n        {children}\n      </span>\n    </span>\n  );\n}\n\n/* ── RuleRow ──────────────────────────────────────────────── */\n// One rule: its barrier in the lane, then the card. Everything that moves is\n// driven from Checkpoint's runner through the data-part hooks; React only\n// decides whether the Approve / Deny pair can be reached.\n\ninterface RuleRowProps {\n  rule: CheckpointRule;\n  holding: boolean;\n  onDecide: (choice: \"approve\" | \"deny\") => void;\n  onHoverActions: (over: boolean) => void;\n}\n\nconst RuleRow = React.memo(function RuleRow({ rule, holding, onDecide, onHoverActions }: RuleRowProps) {\n  return (\n    <li data-checkpoint-row className=\"grid grid-cols-[2.5rem_minmax(0,1fr)] items-center\">\n      {/* The barrier: a pivot on the left, an arm across the lane, a rest on the right. */}\n      <div aria-hidden className=\"relative h-full\">\n        <span className=\"absolute top-1/2 left-[31px] size-[5px] -translate-y-1/2 rounded-full border border-zinc-950/15 bg-white dark:border-white/20 dark:bg-zinc-950\" />\n        <span\n          data-part=\"arm\"\n          className={`absolute top-1/2 left-[7px] -mt-[1.5px] h-[3px] w-[26px] origin-[1.5px_50%] rounded-full bg-zinc-950/20 transition-colors ${TIMING.colors} will-change-transform data-[state=active]:bg-[var(--checkpoint-accent)] data-[state=block]:bg-zinc-950 dark:bg-white/25 dark:data-[state=active]:bg-[var(--checkpoint-accent)] dark:data-[state=block]:bg-white`}\n        />\n        <span className=\"absolute top-1/2 left-[5px] size-[7px] -translate-y-1/2 rounded-full bg-zinc-950 ring-2 ring-white dark:bg-zinc-200 dark:ring-zinc-950\" />\n      </div>\n\n      <div\n        data-part=\"card\"\n        className={`relative flex min-h-14 items-center gap-3 rounded-xl border [--checkpoint-hold:color-mix(in_srgb,var(--checkpoint-accent)_6%,white)] dark:[--checkpoint-hold:color-mix(in_srgb,var(--checkpoint-accent)_10%,#18181b)] border-zinc-950/[0.08] bg-white px-3 py-2.5 shadow-[0_1px_2px_rgba(0,0,0,0.04)] transition-colors ${TIMING.colors} data-[state=block]:border-zinc-950/25 data-[state=hold]:border-[color-mix(in_oklab,var(--checkpoint-accent)_40%,transparent)] dark:border-white/10 dark:bg-zinc-900 dark:data-[state=block]:border-white/30 dark:data-[state=hold]:border-[color-mix(in_oklab,var(--checkpoint-accent)_45%,transparent)]`}\n      >\n        <span\n          data-part=\"tint\"\n          aria-hidden\n          className=\"pointer-events-none absolute inset-0 rounded-[inherit] bg-[color-mix(in_oklab,var(--checkpoint-accent)_6%,transparent)] opacity-0 dark:bg-[color-mix(in_oklab,var(--checkpoint-accent)_10%,transparent)]\"\n        />\n        <span\n          data-part=\"ink\"\n          aria-hidden\n          className=\"pointer-events-none absolute inset-0 rounded-[inherit] bg-zinc-950/[0.035] opacity-0 dark:bg-white/[0.05]\"\n        />\n        {rule.icon ? (\n          <span\n            aria-hidden\n            className=\"relative grid size-4 shrink-0 place-items-center text-zinc-400 dark:text-zinc-500 [&_svg]:size-4\"\n          >\n            {rule.icon}\n          </span>\n        ) : null}\n        <span className=\"relative min-w-0 flex-1\">\n          <span className=\"block truncate text-[13px] leading-[18px] font-medium tracking-tight text-zinc-950 dark:text-zinc-100\">\n            {rule.label}\n          </span>\n          {rule.detail ? (\n            <span className=\"block truncate text-[12px] leading-4 text-zinc-500 dark:text-zinc-400\">{rule.detail}</span>\n          ) : null}\n        </span>\n\n        {rule.value ? (\n          <span\n            data-part=\"tag\"\n            className=\"relative hidden shrink-0 rounded-md border border-zinc-950/10 px-1.5 py-0.5 font-mono text-[11px] leading-4 tracking-wide text-zinc-600 uppercase @[26rem]/checkpoint:block dark:border-white/15 dark:text-zinc-300\"\n          >\n            {rule.value}\n          </span>\n        ) : null}\n\n        {/* Approve / Deny float over the row's right end, on the hold color, so a hold never moves the row. */}\n        <span\n          data-part=\"actions\"\n          inert={!holding}\n          onPointerEnter={(e) => e.pointerType === \"mouse\" && onHoverActions(true)}\n          onPointerLeave={(e) => e.pointerType === \"mouse\" && onHoverActions(false)}\n          className=\"absolute inset-y-0 right-[41px] z-[1] flex items-center gap-1 rounded-r-[inherit] bg-[linear-gradient(to_right,transparent,var(--checkpoint-hold)_1.25rem)] pl-6 opacity-0\"\n        >\n          <button\n            type=\"button\"\n            onClick={() => onDecide(\"deny\")}\n            className={`grid h-7 min-w-7 place-items-center rounded-full border border-zinc-950/10 px-1.5 text-[12px] font-medium text-zinc-700 transition-[background-color] ${TIMING.hover} hover:bg-zinc-950/[0.04] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--checkpoint-accent)] @[26rem]/checkpoint:px-2.5 dark:border-white/15 dark:text-zinc-200 dark:hover:bg-white/[0.06]`}\n          >\n            <Cross className=\"size-3 @[26rem]/checkpoint:hidden\" />\n            <span className=\"sr-only @[26rem]/checkpoint:not-sr-only\">Deny</span>\n          </button>\n          <button\n            type=\"button\"\n            onClick={() => onDecide(\"approve\")}\n            className={`relative h-7 overflow-hidden rounded-full bg-[var(--checkpoint-button)] px-3 text-[12px] font-medium text-white transition-[background-color] ${TIMING.hover} hover:bg-[color-mix(in_oklab,var(--checkpoint-button)_88%,black)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--checkpoint-accent)]`}\n          >\n            Approve\n            <span\n              data-part=\"timer\"\n              aria-hidden\n              className=\"absolute inset-x-0 bottom-0 h-[2px] origin-left bg-white/55 [transform:scaleX(0)] will-change-transform\"\n            />\n          </button>\n        </span>\n\n        <span\n          aria-hidden\n          className=\"relative size-[18px] shrink-0 rounded-[5px] border border-zinc-950/15 dark:border-white/20\"\n        >\n          <span\n            data-part=\"pass\"\n            className=\"absolute -inset-px grid place-items-center rounded-[5px] bg-[var(--checkpoint-accent)] text-white opacity-0\"\n          >\n            <Check className=\"size-3\" />\n          </span>\n          <span\n            data-part=\"block\"\n            className=\"absolute -inset-px grid place-items-center rounded-[5px] bg-zinc-950 text-white opacity-0 dark:bg-white dark:text-zinc-950\"\n          >\n            <Cross className=\"size-3\" />\n          </span>\n          <span\n            data-part=\"hold\"\n            className=\"absolute -inset-px grid place-items-center rounded-[5px] border-[1.5px] border-[var(--checkpoint-accent)] opacity-0\"\n          >\n            <span data-part=\"dot\" className=\"size-1.5 rounded-full bg-[var(--checkpoint-accent)]\" />\n          </span>\n        </span>\n      </div>\n    </li>\n  );\n});\n\n/* ── Checkpoint ───────────────────────────────────────────── */\n\nexport function Checkpoint({\n  rules,\n  requests,\n  current,\n  autoplay = true,\n  approveAfter = TIMING.approveAfter,\n  approver = \"a reviewer\",\n  log = true,\n  onDecision,\n  speed = TIMING.speed,\n  dwell = TIMING.dwell,\n  className,\n  style,\n  ...props\n}: CheckpointProps) {\n  const rootRef = React.useRef<HTMLDivElement>(null);\n  const tokenRef = React.useRef<HTMLSpanElement>(null);\n  const cardRef = React.useRef<HTMLDivElement>(null);\n  const logRef = React.useRef<HTMLOListElement>(null);\n  const reduced = usePrefersReducedMotion();\n\n  const [active, setActive] = React.useState(() =>\n    Math.max(\n      0,\n      requests.findIndex((r) => r.id === current),\n    ),\n  );\n  const [generation, setGeneration] = React.useState(0);\n  const [phase, setPhase] = React.useState<Phase>({ kind: \"queued\" });\n  const [holding, setHolding] = React.useState(-1);\n  const [entries, setEntries] = React.useState<LogEntry[]>([]);\n  const [announcement, setAnnouncement] = React.useState(\"\");\n\n  // `speed`, read by the runner and the log as each move starts, so a new value never restarts a request.\n  const pace = Math.max(0.05, speed);\n  const paceRef = React.useRef(pace);\n  React.useLayoutEffect(() => {\n    paceRef.current = pace;\n  }, [pace]);\n\n  // A new log line: it fades in on top while the older lines step down one line,\n  // the oldest dropping out under the edge. Runs after the commit, before paint.\n  const newest = entries[0]?.key;\n  const lines = entries.length;\n  React.useLayoutEffect(() => {\n    const list = logRef.current;\n    const first = list?.firstElementChild as HTMLElement | null | undefined;\n    if (!list || !first || newest === undefined) return;\n    if (reduced) {\n      first.animate([{ opacity: 0 }, { opacity: 1 }], { duration: TIMING.reduced, easing: TIMING.fade });\n      return;\n    }\n    const roll = TIMING.log / paceRef.current;\n    first.animate([{ opacity: 0 }, { opacity: 1 }], { duration: roll, easing: TIMING.outEase });\n    if (lines > 1) {\n      list.animate([{ transform: `translateY(${-first.offsetHeight}px)` }, { transform: \"translateY(0px)\" }], {\n        duration: roll,\n        easing: TIMING.outEase,\n      });\n    }\n  }, [newest, lines, reduced]);\n\n  // Handlers the runner installs and the buttons call.\n  const decideRef = React.useRef<((choice: \"approve\" | \"deny\") => void) | null>(null);\n  const hoverRef = React.useRef<(over: boolean) => void>(() => {});\n  const onDecide = React.useCallback((choice: \"approve\" | \"deny\") => decideRef.current?.(choice), []);\n  const onHoverActions = React.useCallback((over: boolean) => hoverRef.current(over), []);\n\n  // The latest labels and callbacks, read by the runner without restarting it.\n  const latest = React.useRef({ rules, requests, approver, onDecision, dwell });\n  const ranRef = React.useRef(false); // a request has run, so the next one slides in\n  React.useLayoutEffect(() => {\n    latest.current = { rules, requests, approver, onDecision, dwell: Math.max(0, dwell) };\n  });\n\n  const ruleKey = rules.map((r) => r.id).join(\"\\u0000\");\n  const requestKey = JSON.stringify(requests.map((r) => [r.id, r.verdicts ?? {}]));\n  const wait = approveAfter === false ? 0 : approveAfter;\n\n  React.useEffect(() => {\n    const root = rootRef.current;\n    const token = tokenRef.current;\n    if (!root || !token) return;\n    const reqs = latest.current.requests;\n    if (reqs.length === 0) return;\n\n    const CANCEL = Symbol(\"cancel\");\n    let cancelled = false;\n    let visible = false;\n    let waiters: (() => void)[] = [];\n    let timer: Animation | null = null;\n    let overActions = false;\n    const timers = new Set<number>();\n    const anims = new Set<Animation>();\n    const loops = new Set<Animation>();\n\n    const check = () => {\n      if (cancelled) throw CANCEL;\n    };\n    /** A move's ms at the current `speed`. */\n    const paced = (ms: number) => ms / paceRef.current;\n    const sleep = (ms: number) =>\n      new Promise<void>((resolve) => {\n        const id = window.setTimeout(() => {\n          timers.delete(id);\n          resolve();\n        }, ms);\n        timers.add(id);\n      }).then(check);\n    const frame = () => new Promise<void>((resolve) => requestAnimationFrame(() => resolve())).then(check);\n    const gate = () =>\n      (visible ? Promise.resolve() : new Promise<void>((resolve) => waiters.push(resolve))).then(check);\n\n    type Frame = {\n      transform?: string;\n      opacity?: number | string;\n      offset?: number;\n      easing?: string;\n    };\n    /** WAAPI from explicit keyframes; on finish the end state is written inline and the animation dropped. */\n    const play = (\n      el: HTMLElement | null | undefined,\n      frames: Frame[],\n      duration: number,\n      easing: string = TIMING.outEase,\n      delay = 0,\n    ) => {\n      if (!el) return Promise.resolve().then(check);\n      const a = el.animate(frames as Keyframe[], {\n        duration,\n        easing,\n        delay,\n        fill: \"forwards\",\n      });\n      anims.add(a);\n      return a.finished\n        .then(\n          () => {\n            const end = frames[frames.length - 1];\n            if (end.transform !== undefined) el.style.transform = end.transform;\n            if (end.opacity !== undefined) el.style.opacity = String(end.opacity);\n            a.cancel();\n          },\n          () => {},\n        )\n        .finally(() => anims.delete(a))\n        .then(check);\n    };\n    const set = (el: HTMLElement | null | undefined, transform?: string, opacity?: number) => {\n      if (!el) return;\n      if (transform !== undefined) el.style.transform = transform;\n      if (opacity !== undefined) el.style.opacity = String(opacity);\n    };\n    const state = (el: Element | null | undefined, value?: string) => {\n      if (!el) return;\n      if (value) el.setAttribute(\"data-state\", value);\n      else el.removeAttribute(\"data-state\");\n    };\n\n    const rows = () => Array.from(root.querySelectorAll<HTMLElement>(\"[data-checkpoint-row]\"));\n    const part = (row: HTMLElement | undefined, name: string) =>\n      row?.querySelector<HTMLElement>(`[data-part=\"${name}\"]`);\n    const half = GATE.token / 2;\n    /** y of an element's center, in the root's box. */\n    const centerY = (el: Element) => {\n      const r = el.getBoundingClientRect();\n      return r.top + r.height / 2 - root.getBoundingClientRect().top;\n    };\n    const stopAbove = (row: HTMLElement) => centerY(part(row, \"arm\") ?? row) - 1.5 - GATE.gap - half;\n    const at = (y: number, x = 0) => `translate3d(${x}px, ${y - half}px, 0)`;\n\n    let tokenY = 0;\n    const origin = () => {\n      const icon = cardRef.current?.querySelector(\"[data-part='icon']\");\n      return icon ? centerY(icon) : 0;\n    };\n\n    /** Everything back to rest at once: barriers down, boxes empty, token under the request card. */\n    const clearRows = () => {\n      for (const row of rows()) {\n        for (const name of [\"pass\", \"block\", \"hold\", \"tint\", \"ink\", \"actions\", \"timer\"]) {\n          const el = part(row, name);\n          if (el) {\n            el.getAnimations().forEach((a) => a.cancel());\n            el.style.removeProperty(\"opacity\");\n            el.style.removeProperty(\"transform\");\n          }\n        }\n        const arm = part(row, \"arm\");\n        arm?.getAnimations().forEach((a) => a.cancel());\n        arm?.style.removeProperty(\"transform\");\n        state(arm);\n        state(part(row, \"card\"));\n        set(part(row, \"tag\"), undefined, 1);\n      }\n    };\n    const park = () => {\n      token.getAnimations().forEach((a) => a.cancel());\n      tokenY = origin();\n      set(token, at(tokenY), 1);\n    };\n\n    const isReduced = reduced;\n    const motion = !isReduced;\n\n    /** The token's leg to `y`; the barrier it just passed closes behind it. */\n    const drive = (y: number, behind?: HTMLElement | null) => {\n      if (behind) {\n        play(\n          behind,\n          [{ transform: `rotate(${GATE.lift.angle}deg)` }, { transform: \"rotate(0deg)\" }],\n          paced(TIMING.drop.duration),\n          TIMING.outEase,\n          paced(TIMING.drop.delay),\n        )\n          .then(() => state(behind))\n          .catch(() => {});\n      }\n      const from = tokenY;\n      tokenY = y;\n      return play(token, [{ transform: at(from) }, { transform: at(y) }], paced(TIMING.travel), TIMING.inOut);\n    };\n\n    const tick = (el: HTMLElement | null | undefined) =>\n      motion\n        ? play(\n            el,\n            [\n              { opacity: 0, transform: \"scale(0.7)\" },\n              { opacity: 1, transform: \"scale(1)\" },\n            ],\n            paced(TIMING.tick),\n          )\n        : play(el, [{ opacity: 0 }, { opacity: 1 }], TIMING.reduced, TIMING.fade);\n\n    const breathe = (el: HTMLElement | null | undefined) => {\n      if (!el || !motion) return;\n      const a = el.animate([{ opacity: 1 }, { opacity: 0.3 }, { opacity: 1 }], {\n        duration: TIMING.breathe.duration,\n        iterations: Infinity,\n        easing: TIMING.breathe.easing,\n      });\n      loops.add(a);\n      if (!visible) a.pause();\n    };\n    const stopLoops = () => {\n      loops.forEach((a) => a.cancel());\n      loops.clear();\n    };\n\n    const addLog = async (entry: Omit<LogEntry, \"key\" | \"time\">) => {\n      setEntries((list) =>\n        [{ ...entry, key: Date.now() + Math.random(), time: clock() }, ...list].slice(0, LOG_LINES + 1),\n      );\n      // The roll-in itself runs in a layout effect once the line is committed.\n      await sleep(motion ? paced(TIMING.log) : TIMING.reduced);\n    };\n\n    const decide = (row: HTMLElement) =>\n      new Promise<\"approve\" | \"deny\" | \"auto\">((resolve) => {\n        let done = false;\n        const finish = (choice: \"approve\" | \"deny\" | \"auto\") => {\n          if (done) return;\n          done = true;\n          decideRef.current = null;\n          hoverRef.current = () => {};\n          timer?.cancel();\n          timer = null;\n          // A decision made from the keyboard leaves focus on the checkpoint, not on a button that's going away.\n          if (row.contains(document.activeElement)) root.focus({ preventScroll: true });\n          resolve(choice);\n        };\n        decideRef.current = finish;\n        const timerEl = part(row, \"timer\");\n        if (autoplay && wait > 0 && timerEl) {\n          const a = timerEl.animate([{ transform: \"scaleX(0)\" }, { transform: \"scaleX(1)\" }], {\n            duration: wait,\n            easing: TIMING.timer,\n            fill: \"forwards\",\n          });\n          timer = a;\n          overActions = false;\n          if (!visible) a.pause();\n          hoverRef.current = (over) => {\n            overActions = over;\n            if (over) a.pause();\n            else if (visible) a.play();\n          };\n          a.finished.then(\n            () => finish(\"auto\"),\n            () => {},\n          );\n        }\n      }).then((choice) => {\n        check();\n        return choice;\n      });\n\n    /** One request, top to bottom. */\n    const run = async (index: number, enter: boolean) => {\n      const req = latest.current.requests[index];\n      if (!req) return;\n      if (enter) {\n        await play(\n          cardRef.current?.querySelector<HTMLElement>(\"[data-part='content']\"),\n          [{ opacity: 1 }, { opacity: 0 }],\n          paced(TIMING.enter.out),\n          TIMING.fade,\n        );\n        setActive(index);\n        setGeneration((g) => g + 1);\n        setPhase({ kind: \"checking\" });\n        await frame();\n        await frame();\n        park();\n        await sleep(motion ? paced(TIMING.enter.duration) * 0.6 : TIMING.reduced);\n      } else {\n        setActive(index);\n        setPhase({ kind: \"checking\" });\n        park();\n      }\n\n      const list = rows();\n      const ruleList = latest.current.rules;\n      let behind: HTMLElement | null = null;\n      let outcome: CheckpointOutcome = \"cleared\";\n      let stopped: CheckpointRule | undefined;\n      let approvedBy = \"\";\n\n      for (let i = 0; i < list.length; i++) {\n        const row = list[i];\n        const rule = ruleList[i];\n        if (!rule) break;\n        const verdict = req.verdicts?.[rule.id] ?? \"pass\";\n        const arm = part(row, \"arm\");\n        const card = part(row, \"card\");\n        await gate();\n\n        if (motion) await drive(stopAbove(row), behind);\n        behind = null;\n\n        // read\n        state(arm, \"active\");\n        if (motion) await play(part(row, \"tint\"), [{ opacity: 0 }, { opacity: 1 }], paced(TIMING.read), TIMING.outEase);\n        else await sleep(TIMING.reduced);\n        await gate();\n\n        let lifted = verdict === \"pass\";\n        if (verdict === \"hold\") {\n          state(card, \"hold\");\n          set(part(row, \"tint\"), undefined, 1);\n          setHolding(i);\n          setPhase({ kind: \"hold\", rule: rule.label });\n          setAnnouncement(`${req.label} needs approval: ${rule.label}${rule.detail ? `. ${rule.detail}` : \"\"}.`);\n          const hold = part(row, \"hold\");\n          tick(hold).catch(() => {});\n          breathe(part(row, \"dot\"));\n          if (motion) {\n            play(\n              token,\n              [{ transform: at(tokenY) }, { transform: at(tokenY + GATE.settle.distance) }],\n              paced(TIMING.settle),\n            ).catch(() => {});\n            tokenY += GATE.settle.distance;\n          }\n          await frame();\n          const fade = motion ? paced(TIMING.swap) : TIMING.reduced;\n          play(part(row, \"tag\"), [{ opacity: 1 }, { opacity: 0 }], fade, TIMING.fade).catch(() => {});\n          await play(part(row, \"actions\"), [{ opacity: 0 }, { opacity: 1 }], fade, TIMING.fade);\n\n          const choice = await decide(row);\n          setHolding(-1);\n          stopLoops();\n          play(part(row, \"actions\"), [{ opacity: 1 }, { opacity: 0 }], fade, TIMING.fade).catch(() => {});\n          play(part(row, \"tag\"), [{ opacity: 0 }, { opacity: 1 }], fade, TIMING.fade).catch(() => {});\n          play(hold, [{ opacity: 1 }, { opacity: 0 }], fade, TIMING.fade).catch(() => {});\n          state(card);\n          if (choice === \"deny\") {\n            outcome = \"denied\";\n          } else {\n            approvedBy = choice === \"auto\" ? latest.current.approver : \"you\";\n            lifted = true;\n          }\n          setPhase({ kind: \"checking\" });\n        }\n\n        if (lifted) {\n          play(part(row, \"tint\"), [{ opacity: 1 }, { opacity: 0 }], paced(TIMING.untint), TIMING.fade).catch(() => {});\n          tick(part(row, \"pass\")).catch(() => {});\n          if (motion) {\n            play(\n              arm,\n              [{ transform: \"rotate(0deg)\" }, { transform: `rotate(${GATE.lift.angle}deg)` }],\n              paced(TIMING.lift),\n              TIMING.outEase,\n            ).catch(() => {});\n            // the token pulls away halfway up; the barrier closes behind it on its next leg\n            await sleep(paced(TIMING.lift) / 2);\n            behind = arm ?? null;\n          } else {\n            state(arm);\n            await sleep(TIMING.reduced);\n          }\n          continue;\n        }\n\n        // block, or a hold that was denied\n        stopped = rule;\n        if (outcome !== \"denied\") outcome = \"blocked\";\n        state(arm, \"block\");\n        state(card, \"block\");\n        set(part(row, \"tint\"), undefined, 0);\n        set(part(row, \"ink\"), undefined, 1);\n        tick(part(row, \"block\")).catch(() => {});\n        if (motion && outcome === \"blocked\") {\n          const d = GATE.knock.distance;\n          const y = tokenY;\n          await play(\n            token,\n            [\n              { transform: at(y), easing: TIMING.inEase },\n              { transform: at(y + d), offset: 0.22, easing: TIMING.outEase },\n              {\n                transform: at(y),\n                offset: 0.5,\n                easing: TIMING.inEase,\n              },\n              { transform: at(y + d / 2), offset: 0.68, easing: TIMING.outEase },\n              { transform: at(y) },\n            ],\n            paced(TIMING.knock.duration),\n            TIMING.knock.easing,\n          );\n        }\n        if (motion) {\n          await play(\n            token,\n            [\n              { transform: at(tokenY), opacity: 1 },\n              { transform: at(tokenY, -GATE.away.distance), opacity: 0 },\n            ],\n            paced(TIMING.away),\n            TIMING.outEase,\n          );\n        }\n        break;\n      }\n\n      if (outcome === \"cleared\") {\n        setPhase({ kind: \"cleared\" });\n        setAnnouncement(`${req.label} cleared${approvedBy ? `, approved by ${approvedBy}` : \"\"}.`);\n        const listEl = logRef.current;\n        if (motion) {\n          const end = log && listEl ? centerY(listEl) - listEl.getBoundingClientRect().height / 2 + 11 : tokenY + 40;\n          await drive(end, behind);\n          behind = null;\n          play(token, [{ opacity: 1 }, { opacity: 0 }], paced(TIMING.tokenOut), TIMING.fade).catch(() => {});\n        }\n        if (log) {\n          await addLog({\n            ok: true,\n            label: req.label,\n            note: approvedBy ? `ran · approved by ${approvedBy}` : \"ran\",\n          });\n        }\n      } else {\n        const why = req.reason ?? stopped?.label ?? \"\";\n        setPhase(outcome === \"denied\" ? { kind: \"denied\", rule: why } : { kind: \"blocked\", rule: why });\n        setAnnouncement(`${req.label} ${outcome === \"denied\" ? \"denied\" : \"blocked\"}${why ? `: ${why}` : \"\"}.`);\n        if (log)\n          await addLog({\n            ok: false,\n            label: req.label,\n            note: `${outcome}${why ? ` · ${why}` : \"\"}`,\n          });\n      }\n      latest.current.onDecision?.(req.id, outcome, stopped?.id);\n    };\n\n    /** Boxes clear and barriers close, last row first. */\n    const reset = async () => {\n      const list = rows();\n      const fades: Promise<void>[] = [];\n      list\n        .slice()\n        .reverse()\n        .forEach((row, k) => {\n          const delay = motion ? k * paced(TIMING.reset.stagger) : 0;\n          for (const name of [\"pass\", \"block\", \"tint\", \"ink\"]) {\n            const el = part(row, name);\n            if (el && el.style.opacity && el.style.opacity !== \"0\") {\n              fades.push(play(el, [{ opacity: 1 }, { opacity: 0 }], paced(TIMING.reset.duration), TIMING.fade, delay));\n            }\n          }\n          state(part(row, \"card\"));\n        });\n      await Promise.all(fades);\n      clearRows();\n    };\n\n    const start = Math.max(\n      0,\n      reqs.findIndex((r) => r.id === current),\n    );\n    const loop = current === undefined && autoplay;\n    const main = async () => {\n      const again = ranRef.current;\n      if (!again) {\n        clearRows();\n        park();\n      }\n      await gate();\n      if (again) await reset();\n      let index = start;\n      let enter = again;\n      for (;;) {\n        ranRef.current = true;\n        await run(index, enter);\n        enter = true;\n        if (!loop) break;\n        await sleep(latest.current.dwell);\n        await gate();\n        await reset();\n        index = (index + 1) % latest.current.requests.length;\n      }\n    };\n\n    const setVisible = (v: boolean) => {\n      visible = v;\n      if (v) {\n        const ready = waiters;\n        waiters = [];\n        ready.forEach((resolve) => resolve());\n        if (timer && !overActions) timer.play();\n        loops.forEach((a) => a.play());\n      } else {\n        timer?.pause();\n        loops.forEach((a) => a.pause());\n      }\n    };\n    let inView = false;\n    const io = new IntersectionObserver(\n      ([entry]) => {\n        inView = entry.isIntersecting && entry.intersectionRatio >= GATE.view - 0.01;\n        if (!entry.isIntersecting) inView = false;\n        setVisible(inView && !document.hidden);\n      },\n      { threshold: [0, GATE.view] },\n    );\n    io.observe(root);\n    const onVisibility = () => setVisible(inView && !document.hidden);\n    document.addEventListener(\"visibilitychange\", onVisibility);\n\n    main().catch((error) => {\n      if (error !== CANCEL) throw error;\n    });\n\n    return () => {\n      cancelled = true;\n      io.disconnect();\n      document.removeEventListener(\"visibilitychange\", onVisibility);\n      timers.forEach((id) => window.clearTimeout(id));\n      anims.forEach((a) => a.cancel());\n      stopLoops();\n      timer?.cancel();\n      decideRef.current = null;\n      hoverRef.current = () => {};\n      setHolding(-1);\n    };\n  }, [ruleKey, requestKey, current, autoplay, wait, log, reduced]);\n\n  const req = requests[active] ?? requests[0];\n\n  const status = (() => {\n    switch (phase.kind) {\n      // `short` is what a narrow box shows, so the request's name keeps its room.\n      case \"queued\":\n        return { id: \"queued\", tone: \"muted\", text: \"Queued\", short: \"Queued\" };\n      case \"checking\":\n        return { id: \"checking\", tone: \"muted\", text: \"Checking\", short: \"Checking\" };\n      case \"hold\":\n        return { id: `hold-${phase.rule}`, tone: \"accent\", text: \"Waiting on approval\", short: \"Waiting\" };\n      case \"cleared\":\n        return { id: \"cleared\", tone: \"accent\", text: \"Cleared\", short: \"Cleared\" };\n      case \"blocked\":\n        return {\n          id: `blocked-${phase.rule}`,\n          tone: \"ink\",\n          text: phase.rule ? `Blocked · ${phase.rule}` : \"Blocked\",\n          short: \"Blocked\",\n        };\n      case \"denied\":\n        return {\n          id: `denied-${phase.rule}`,\n          tone: \"ink\",\n          text: phase.rule ? `Denied · ${phase.rule}` : \"Denied\",\n          short: \"Denied\",\n        };\n    }\n  })();\n\n  return (\n    <div\n      ref={rootRef}\n      tabIndex={-1}\n      className={cn(\n        \"@container/checkpoint relative w-full text-zinc-950 outline-none [--checkpoint-accent:#ff3b1f] [--checkpoint-button:color-mix(in_oklab,var(--checkpoint-accent)_80%,black)] [--checkpoint-text:color-mix(in_oklab,var(--checkpoint-accent)_78%,black)] dark:text-zinc-100 dark:[--checkpoint-accent:#ff5a3c] dark:[--checkpoint-button:color-mix(in_oklab,var(--checkpoint-accent)_72%,black)] dark:[--checkpoint-text:var(--checkpoint-accent)]\",\n        className,\n      )}\n      style={style}\n      {...props}\n    >\n      <span className=\"sr-only\" aria-live=\"polite\">\n        {announcement}\n      </span>\n\n      {/* The lane's hairline, from under the request card to the log. */}\n      <span\n        aria-hidden\n        className={cn(\n          \"pointer-events-none absolute top-6 left-[19.5px] w-px bg-zinc-950/10 dark:bg-white/10\",\n          log ? \"bottom-[55px]\" : \"bottom-0\",\n        )}\n      />\n\n      {/* The request card: the token waits under it, so it drops out from beneath the icon. */}\n      <div\n        ref={cardRef}\n        className=\"relative z-10 flex min-h-12 items-center gap-3 rounded-xl border border-zinc-950/[0.08] bg-white py-2 pr-3 pl-1.5 shadow-[0_1px_2px_rgba(0,0,0,0.04),0_4px_12px_-6px_rgba(0,0,0,0.08)] dark:border-white/10 dark:bg-zinc-900\"\n      >\n        {req ? (\n          <RequestContent key={generation} request={req} enter={generation > 0} reduced={reduced} speed={pace} />\n        ) : null}\n        <span className=\"ml-auto flex shrink-0 items-center text-[12px] leading-4 font-medium\">\n          <Swap id={status.id} reduced={reduced}>\n            {/* Each status carries its own color, so the leaving one keeps its tone as it fades. */}\n            <span\n              className={cn(\n                \"inline-flex items-center gap-1.5\",\n                status.tone === \"muted\" && \"text-zinc-500 dark:text-zinc-400\",\n                status.tone === \"accent\" && \"text-[var(--checkpoint-text)]\",\n                status.tone === \"ink\" && \"text-zinc-950 dark:text-zinc-100\",\n              )}\n            >\n              {status.id === \"cleared\" ? (\n                <Check className=\"size-3\" />\n              ) : status.tone === \"ink\" ? (\n                <Cross className=\"size-3\" />\n              ) : (\n                <span\n                  aria-hidden\n                  className={cn(\n                    \"size-1.5 rounded-full\",\n                    status.tone === \"accent\" ? \"bg-[var(--checkpoint-accent)]\" : \"bg-zinc-950/25 dark:bg-white/30\",\n                  )}\n                />\n              )}\n              <span className=\"@[28rem]/checkpoint:hidden\">{status.short}</span>\n              <span className=\"hidden max-w-[30ch] truncate @[28rem]/checkpoint:block\">{status.text}</span>\n            </span>\n          </Swap>\n        </span>\n      </div>\n\n      <span\n        ref={tokenRef}\n        aria-hidden\n        className=\"pointer-events-none absolute top-0 left-[14px] z-[5] size-3 rounded-[4px] bg-[var(--checkpoint-accent)] shadow-[0_0_0_3px_color-mix(in_oklab,var(--checkpoint-accent)_18%,transparent)] will-change-transform\"\n      />\n\n      <ol className=\"relative mt-3 space-y-2\">\n        {rules.map((rule, i) => (\n          <RuleRow\n            key={rule.id}\n            rule={rule}\n            holding={holding === i}\n            onDecide={onDecide}\n            onHoverActions={onHoverActions}\n          />\n        ))}\n      </ol>\n\n      {log ? (\n        <div className=\"relative mt-3 h-[66px] overflow-hidden [mask-image:linear-gradient(to_bottom,#000_70%,transparent)]\">\n          <ol ref={logRef} className=\"will-change-transform\" aria-label=\"Recent decisions\">\n            {entries.map((entry) => (\n              <li key={entry.key} className=\"grid h-[22px] grid-cols-[2.5rem_minmax(0,1fr)_auto] items-center\">\n                <span className=\"grid place-items-center\">\n                  <span\n                    className={cn(\n                      \"grid size-3 place-items-center rounded-[4px]\",\n                      entry.ok\n                        ? \"bg-[var(--checkpoint-accent)] text-white\"\n                        : \"bg-zinc-950 text-white dark:bg-white dark:text-zinc-950\",\n                    )}\n                  >\n                    {entry.ok ? <Check className=\"size-2.5\" /> : <Cross className=\"size-2.5\" />}\n                  </span>\n                </span>\n                <span className=\"min-w-0 truncate text-[12px] text-zinc-500 dark:text-zinc-400\">\n                  <span className=\"font-mono text-[11.5px] text-zinc-800 dark:text-zinc-200\">{entry.label}</span>{\" \"}\n                  {entry.note}\n                </span>\n                <span className=\"pl-3 font-mono text-[11px] text-zinc-400 tabular-nums dark:text-zinc-500\">\n                  {entry.time}\n                </span>\n              </li>\n            ))}\n          </ol>\n        </div>\n      ) : null}\n    </div>\n  );\n}\n\n/* ── RequestContent ───────────────────────────────────────── */\n// The request card's contents. A new request slides in from the left; the\n// first one is already there when the page loads.\n\nfunction RequestContent({\n  request,\n  enter,\n  reduced,\n  speed,\n}: {\n  request: CheckpointRequest;\n  enter: boolean;\n  reduced: boolean;\n  speed: number;\n}) {\n  const ref = React.useRef<HTMLDivElement>(null);\n  // Each request mounts fresh (keyed), so it slides in at the speed it arrived with.\n  const [slide] = React.useState(() => TIMING.enter.duration / speed);\n  React.useLayoutEffect(() => {\n    if (!enter || !ref.current) return;\n    const a = ref.current.animate(\n      reduced\n        ? [{ opacity: 0 }, { opacity: 1 }]\n        : [\n            { opacity: 0, transform: `translateX(${-GATE.enter.distance}px)` },\n            { opacity: 1, transform: \"none\" },\n          ],\n      {\n        duration: reduced ? TIMING.reduced : slide,\n        easing: TIMING.outEase,\n      },\n    );\n    return () => a.cancel();\n  }, [enter, reduced, slide]);\n\n  return (\n    <div ref={ref} data-part=\"content\" className=\"flex min-w-0 items-center gap-3\">\n      <span\n        data-part=\"icon\"\n        aria-hidden\n        className=\"grid size-[26px] shrink-0 place-items-center rounded-lg bg-[color-mix(in_oklab,var(--checkpoint-accent)_12%,transparent)] text-[var(--checkpoint-accent)] [&_svg]:size-3.5\"\n      >\n        {request.icon ?? <span className=\"size-1.5 rounded-full bg-current\" />}\n      </span>\n      <span className=\"min-w-0\">\n        <span className=\"block truncate font-mono text-[13px] leading-[18px] text-zinc-950 dark:text-zinc-100\">\n          {request.label}\n        </span>\n        {request.meta ? (\n          <span className=\"block truncate text-[12px] leading-4 text-zinc-500 dark:text-zinc-400\">{request.meta}</span>\n        ) : null}\n      </span>\n    </div>\n  );\n}\n"
    }
  ]
}