{ "$schema": "https://ui.shadcn.com/schema/registry-item.json", "name": "quoin-lockup", "title": "Quoin Lockup", "description": "A bento grid whose only variable is pressure, not cell assignment: four quoins hold a fixed five-tile arrangement flush, pressure creeps down until a tile pies out of plane, and a quoin-by-quoin re-key — occasionally a full planer sweep — brings it back, forever.", "dependencies": [], "files": [ { "path": "registry/core/quoin-lockup/component.tsx", "content": "\"use client\";\n\nimport { useLayoutEffect, useMemo, useRef, useState, type KeyboardEvent } from \"react\";\n\n// ---------------------------------------------------------------------------\n// QuoinLockup — a bento grid whose interesting variable is PRESSURE, not cell\n// assignment. Five tiles sit in a FIXED arrangement inside a steel chase; the\n// gutters between them are real furniture with discrete quantised widths, and\n// four quoins (opposing wedge pairs at the right edge and the foot) supply the\n// pressure that holds the whole lockup flush. Pressure creeps down forever;\n// once a tile's seeded hold value crosses the lift threshold it pies — sinks\n// out of plane, tilts, grows a contact shadow — and the operator re-keys the\n// quoins one at a time to bring it back. Nothing ever changes which cell a\n// tile occupies: that is the entire difference from grid-bento-dense (which\n// re-packs on `grid-auto-flow: dense`) and grid-bento-ascii (which re-spans a\n// cell across every seam track). Here the arrangement is a constant; only the\n// pressure — and, downstream of it, gutter width and tile plane — moves.\n//\n// D8 (round 13 decisions): this sits near letterpress the same way\n// convert-foil-block does, but the two are disjoint. foil-block's variable is\n// a dual TRANSFER THRESHOLD (heat + force) deciding whether a mark takes on\n// paper at all; it renders no bed of type. This component's variable is\n// PRESSURE distributing an already-fixed layout — it never decides whether\n// content \"takes\", only how tightly the grid holding it is locked up.\n//\n// Colour is pure CSS: every value comes from --background/--foreground/\n// --ns-muted/--border/--ns-accent through Tailwind utilities or an inline\n// `color-mix(in srgb, var(--x), var(--y) N%)`, with light/dark deltas carried\n// by a `dark:` class flipping a small custom property the color-mix reads.\n// Nothing here is a raster surface, so there is no getComputedStyle/\n// MutationObserver token pipeline to race against first paint — the browser\n// resolves every var() and color-mix() synchronously at paint time. This\n// mirrors grid-bento-dense, the nearest sibling in this collection (\"All\n// color from tokens via Tailwind utility classes, zero canvas\").\n// ---------------------------------------------------------------------------\n\nexport interface QuoinLockupTile {\n id: string;\n title: string;\n body?: string;\n href?: string;\n}\n\nexport interface QuoinLockupProps {\n /** Exactly 5 tiles, fixed arrangement (2x2 hero, two elongated, two 1x1). */\n tiles?: QuoinLockupTile[];\n /** How often (in press cycles) the planer sweeps and flushes the whole form. */\n planerEvery?: number;\n className?: string;\n}\n\nconst DEFAULT_TILES: QuoinLockupTile[] = [\n {\n id: \"hero\",\n title: \"One workspace, everything in it\",\n body: \"Docs, tasks and reviews read from the same record, so nothing drifts out of sync between them.\",\n href: \"#\",\n },\n { id: \"tall\", title: \"Fast on a cold start\", body: \"Pages stream in as you open them, with no build step to wait on.\", href: \"#\" },\n { id: \"wide\", title: \"Version history\", body: \"Roll any document back to an earlier state without leaving the page.\", href: \"#\" },\n { id: \"a\", title: \"Scoped access\", body: \"Invite a team and choose exactly what each role can see.\", href: \"#\" },\n { id: \"b\", title: \"Works offline\", body: \"Edits queue on the device and merge cleanly the moment you reconnect.\", href: \"#\" },\n];\n\n// -- real numbers (spec section 5) ------------------------------------------\nconst CHASE_INSET_F = 0.055;\nconst RAIL_STROKE_F = 0.012;\nconst U_F = 0.0125; // one pica, as a fraction of M\nconst LEGAL_LEVELS = [2, 3, 4, 6, 8]; // legal gutter widths, in u\nconst QUOIN_TRAVEL_U = 1.0;\nconst P_MAX = 0.93;\nconst P_MIN = 0.62;\nconst LIFT_THRESHOLD = 0.62;\nconst DECAY_RATE = 0.055; // P units / second\nconst DECAY_DURATION = (P_MAX - P_MIN) / DECAY_RATE; // ~5.64s, spec's \"5.6s\"\nconst QUOIN_COUNT = 4;\nconst QUOIN_INTERVAL = 0.64; // s between quoins starting their turn\nconst QUOIN_ROTATE = 0.32; // s for a key to turn 90deg\nconst QUOIN_STEP_UP = 0.19; // P per quoin, clamped at P_MAX\nconst REKEY_DURATION = QUOIN_COUNT * QUOIN_INTERVAL; // 2.56s, spec's \"~2.6s\"\nconst CYCLE = DECAY_DURATION + REKEY_DURATION; // ~8.2s, spec's period\nconst PLANER_DURATION = 0.7;\nconst SINK_DEPTH_F = 0.028; // fraction of M\nconst SINK_SCALE = 0.022; // 1 - this at full sink -> 0.978\nconst SINK_TILT_DEG = 0.9;\nconst STATIC_TIME = 6.3;\n\n// fixed seed, never Math.random: same tile always loosens first\nconst JITTER = [-0.62, 0.35, -0.88, 0.71, 0.08];\nconst TILT_SIGN = [1, -1, 1, -1, 1];\n\ntype GutterKey = \"gx1\" | \"gx2\" | \"gy1\" | \"gy2\" | \"gy3\";\nconst FULL_GUTTERS: GutterKey[] = [\"gx1\", \"gx2\", \"gy1\", \"gy2\", \"gy3\"];\nconst COMPACT_GUTTERS: GutterKey[] = [\"gx1\", \"gy1\"];\n\n// which gutters border each tile, so hover/focus can step just those down a\n// legal size — nothing about the grid ever re-assigns, only these widths\nconst FULL_TILE_GUTTERS: GutterKey[][] = [\n [\"gx2\", \"gy2\"], // hero: 2x2, cols 1-2 rows 1-2\n [\"gx2\", \"gy2\"], // tall: 1x2, col 3 rows 1-2\n [\"gy2\", \"gy3\"], // wide: 2x1, cols 1-2 row 3\n [\"gx2\", \"gy2\", \"gy3\"], // a: 1x1, col 3 row 3\n [\"gy3\"], // b: full-width foot course, row 4\n];\nconst COMPACT_TILE_GUTTERS: GutterKey[][] = [\n [\"gy1\"], // wide: 2x1, cols 1-2 row 1\n [\"gx1\", \"gy1\"], // a: 1x1, col 1 row 2\n [\"gx1\", \"gy1\"], // b: 1x1, col 2 row 2\n];\n\nfunction quantize(target: number): number {\n let best = LEGAL_LEVELS[0];\n let bestDist = Infinity;\n for (const level of LEGAL_LEVELS) {\n const d = Math.abs(level - target);\n if (d < bestDist) {\n bestDist = d;\n best = level;\n }\n }\n return best;\n}\n\n// legal gutter width, in u, for a given pressure: tighter lockup -> narrower\n// furniture. Quantised, so this never reports a continuous value.\nfunction gutterLevelFor(p: number): number {\n const clamped = Math.min(1, Math.max(0, p));\n const target = 2 + (1 - clamped) * (8 - 2);\n return quantize(target);\n}\n\nfunction smoothstep(x: number): number {\n const t = Math.min(1, Math.max(0, x));\n return t * t * (3 - 2 * t);\n}\n\ninterface QuoinLockupState {\n p: number;\n cyclePos: number;\n rekeyActive: boolean;\n activeQuoin: number; // -1 when none mid-turn\n quoinTravel: number[]; // 0..1, one per quoin, uniform\n keyDock: number; // which quoin the key sits at when idle (last one turned)\n keyRotate: number; // 0..1 (0..90deg) for the quoin mid-turn\n planerActive: boolean;\n planerX: number; // 0..1 across the form\n}\n\n// Pure function of absolute time: no integration, so the same t always\n// produces the same frame. This is what makes STATIC_TIME byte-stable.\nfunction stateAt(t: number, planerEvery: number): QuoinLockupState {\n const cycleIndex = Math.floor(t / CYCLE);\n const cyclePos = t - cycleIndex * CYCLE;\n const isPlanerCycle = planerEvery > 0 && (cycleIndex + 1) % planerEvery === 0;\n\n let p: number;\n let rekeyActive = false;\n let activeQuoin = -1;\n const quoinTravel = [0, 0, 0, 0];\n let keyDock = QUOIN_COUNT - 1;\n let keyRotate = 0;\n let planerActive = false;\n let planerX = 0;\n\n if (cyclePos < DECAY_DURATION) {\n p = P_MAX - DECAY_RATE * cyclePos;\n // wedges ease back toward their resting travel as pressure relaxes\n const travel = smoothstep((p - P_MIN) / (P_MAX - P_MIN));\n quoinTravel[0] = quoinTravel[1] = quoinTravel[2] = quoinTravel[3] = travel;\n keyDock = -1; // key is out, riding the last quoin from the previous cycle\n } else {\n rekeyActive = true;\n const rk = cyclePos - DECAY_DURATION;\n p = LIFT_THRESHOLD;\n for (let i = 0; i < QUOIN_COUNT; i++) {\n const start = i * QUOIN_INTERVAL;\n if (rk < start) {\n quoinTravel[i] = 0;\n continue;\n }\n const local = rk - start;\n const turnProgress = smoothstep(local / QUOIN_ROTATE);\n quoinTravel[i] = turnProgress;\n if (local < QUOIN_ROTATE) {\n activeQuoin = i;\n keyRotate = turnProgress;\n } else {\n keyDock = i;\n }\n // the +0.19 step begins 140ms into the turn and completes over the\n // remaining 180ms (critically damped ease, approximated by smoothstep);\n // each later quoin's iteration overwrites p with its own cumulative\n // total, so the last quoin whose turn has started wins, which is\n // exactly the running pressure after i completed steps plus this one\n const stepProgress = smoothstep((local - 0.14) / 0.18);\n p = Math.min(P_MAX, LIFT_THRESHOLD + i * QUOIN_STEP_UP + QUOIN_STEP_UP * stepProgress);\n }\n if (isPlanerCycle && rk < PLANER_DURATION) {\n planerActive = true;\n planerX = smoothstep(rk / PLANER_DURATION);\n }\n }\n\n return { p, cyclePos, rekeyActive, activeQuoin, quoinTravel, keyDock, keyRotate, planerActive, planerX };\n}\n\nfunction sinkFracFor(p: number, index: number): number {\n const h = p + 0.1 * JITTER[index];\n if (h >= LIFT_THRESHOLD) return 0;\n return Math.min(1, (LIFT_THRESHOLD - h) / LIFT_THRESHOLD);\n}\n\n// tile x-position, as a fraction of the chase width, used only to decide when\n// the planer bar has swept past a given tile (left column vs right column)\nconst FULL_TILE_X: number[] = [0.28, 0.83, 0.28, 0.83, 0.5];\nconst COMPACT_TILE_X: number[] = [0.5, 0.25, 0.75];\n\nexport function QuoinLockup({ tiles = DEFAULT_TILES, planerEvery = 3, className = \"\" }: QuoinLockupProps) {\n const hostRef = useRef(null);\n const [m, setM] = useState(0);\n const [compact, setCompact] = useState(false);\n const [hoveredId, setHoveredId] = useState(null);\n const [activeIdx, setActiveIdx] = useState(0);\n const [reducedMotion, setReducedMotion] = useState(false);\n\n const gridRef = useRef(null);\n const tileRefs = useRef(new Map());\n const quoinRefs = useRef<(HTMLDivElement | null)[]>([null, null, null, null]);\n const keyRef = useRef(null);\n const planerRef = useRef(null);\n const railRef = useRef(null);\n\n const rows = compact ? tiles.slice(0, 3) : tiles.slice(0, 5);\n const gutterKeys = compact ? COMPACT_GUTTERS : FULL_GUTTERS;\n const tileGutters = compact ? COMPACT_TILE_GUTTERS : FULL_TILE_GUTTERS;\n const tileX = compact ? COMPACT_TILE_X : FULL_TILE_X;\n\n // measure before paint so the form is never shown at the wrong size\n useLayoutEffect(() => {\n const host = hostRef.current;\n if (!host) return;\n const measure = (w: number) => {\n setM(w);\n setCompact(w < 320);\n };\n const rect = host.getBoundingClientRect();\n measure(Math.min(rect.width, rect.height) || rect.width);\n const ro = new ResizeObserver((entries) => {\n const entry = entries[0];\n if (!entry) return;\n const box = entry.contentRect;\n measure(Math.min(box.width, box.height) || box.width);\n });\n ro.observe(host);\n return () => ro.disconnect();\n }, []);\n\n useLayoutEffect(() => {\n const mq = window.matchMedia(\"(prefers-reduced-motion: reduce)\");\n setReducedMotion(mq.matches);\n const onChange = () => setReducedMotion(mq.matches);\n mq.addEventListener(\"change\", onChange);\n return () => mq.removeEventListener(\"change\", onChange);\n }, []);\n\n const u = m * U_F;\n\n const applyFrame = useMemo(\n () => (t: number) => {\n const st = stateAt(t, planerEvery);\n\n // gutters: pressure-derived legal width, minus one legal step for\n // whichever gutters border the currently hovered/focused tile\n const hoveredIndex = hoveredId ? rows.findIndex((c) => c.id === hoveredId) : -1;\n const hoveredKeys = hoveredIndex >= 0 ? tileGutters[hoveredIndex] : [];\n const baseLevel = gutterLevelFor(st.p);\n const grid = gridRef.current;\n if (grid) {\n for (const key of gutterKeys) {\n let level = baseLevel;\n if (hoveredKeys.includes(key)) {\n const idx = LEGAL_LEVELS.indexOf(level);\n level = LEGAL_LEVELS[Math.max(0, idx - 1)];\n }\n // the track size lives on the grid container's own custom\n // property — a property set on a gutter cell would not be\n // inherited upward by its ancestor's grid-template\n grid.style.setProperty(`--gw-${key}`, `${level * u}px`);\n }\n }\n\n // tiles: sink, tilt, contact shadow, planer override\n rows.forEach((tile, i) => {\n const el = tileRefs.current.get(tile.id);\n if (!el) return;\n let sink = sinkFracFor(st.p, i);\n if (st.planerActive && st.planerX >= tileX[i]) sink = 0;\n const sinkPx = sink * SINK_DEPTH_F * m;\n const scale = 1 - SINK_SCALE * sink;\n const tilt = SINK_TILT_DEG * sink * TILT_SIGN[i];\n el.style.setProperty(\"--sink\", `${sinkPx}px`);\n el.style.setProperty(\"--tile-scale\", `${scale}`);\n el.style.setProperty(\"--tile-tilt\", `${tilt}deg`);\n el.style.setProperty(\"--shadow-o\", `${sink}`);\n el.style.setProperty(\"--edge-o\", `${1 - sink}`);\n });\n\n // quoins + key\n for (let i = 0; i < QUOIN_COUNT; i++) {\n const el = quoinRefs.current[i];\n if (el) el.style.setProperty(\"--travel\", `${st.quoinTravel[i] * QUOIN_TRAVEL_U * u}px`);\n }\n if (keyRef.current) {\n const dockIndex = st.activeQuoin >= 0 ? st.activeQuoin : Math.max(0, st.keyDock);\n keyRef.current.style.setProperty(\"--key-slot\", `${dockIndex}`);\n keyRef.current.style.setProperty(\"--key-rotate\", `${st.keyRotate * 90}deg`);\n keyRef.current.style.opacity = st.rekeyActive ? \"1\" : \"0\";\n }\n if (planerRef.current) {\n planerRef.current.style.opacity = st.planerActive ? \"1\" : \"0\";\n planerRef.current.style.setProperty(\"--planer-x\", `${st.planerX * 100}%`);\n }\n },\n // eslint-disable-next-line react-hooks/exhaustive-deps\n [m, u, compact, hoveredId, planerEvery]\n );\n\n useLayoutEffect(() => {\n if (m <= 0) return;\n\n if (reducedMotion) {\n applyFrame(STATIC_TIME);\n return;\n }\n\n let raf = 0;\n let running = false;\n const origin = performance.now();\n\n const loop = (now: number) => {\n applyFrame((now - origin) / 1000);\n raf = requestAnimationFrame(loop);\n };\n const wake = () => {\n if (running) return;\n running = true;\n raf = requestAnimationFrame(loop);\n };\n const sleep = () => {\n cancelAnimationFrame(raf);\n running = false;\n };\n\n const host = hostRef.current;\n let onScreen = true;\n const io = host\n ? new IntersectionObserver(\n (entries) => {\n onScreen = entries.some((en) => en.isIntersecting);\n if (!onScreen) sleep();\n else if (!document.hidden) wake();\n },\n { threshold: 0 }\n )\n : null;\n if (host && io) io.observe(host);\n\n const onVis = () => {\n if (document.hidden) sleep();\n else if (onScreen) wake();\n };\n document.addEventListener(\"visibilitychange\", onVis);\n wake();\n\n return () => {\n sleep();\n io?.disconnect();\n document.removeEventListener(\"visibilitychange\", onVis);\n };\n }, [m, reducedMotion, applyFrame]);\n\n const onKeyDown = (e: KeyboardEvent, index: number) => {\n const count = rows.length;\n let next = index;\n switch (e.key) {\n case \"ArrowRight\":\n case \"ArrowDown\":\n e.preventDefault();\n next = (index + 1) % count;\n break;\n case \"ArrowLeft\":\n case \"ArrowUp\":\n e.preventDefault();\n next = (index - 1 + count) % count;\n break;\n default:\n return;\n }\n setActiveIdx(next);\n const el = tileRefs.current.get(rows[next].id);\n el?.focus();\n };\n\n // grid-column/row spans are module-level constants, never written after\n // mount — pressure changes gutter TRACK SIZE (the --gw-* custom\n // properties, set imperatively on the grid container in applyFrame), spans\n // never change.\n const fullTemplateCols = \"minmax(0,1fr) var(--gw-gx1,3px) minmax(0,1fr) var(--gw-gx2,3px) minmax(0,1fr)\";\n const fullTemplateRows =\n \"minmax(0,1fr) var(--gw-gy1,3px) minmax(0,1fr) var(--gw-gy2,3px) minmax(0,1fr) var(--gw-gy3,3px) minmax(0,1fr)\";\n const compactTemplateCols = \"minmax(0,1fr) var(--gw-gx1,3px) minmax(0,1fr)\";\n const compactTemplateRows = \"minmax(0,1fr) var(--gw-gy1,3px) minmax(0,1fr)\";\n\n return (\n
\n {/* frame layer: chase rail + quoins + key + planer. Positioned as\n fractions of the chase, so it needs nothing from the tile grid. */}\n
\n \n {[0, 1, 2, 3].map((i) => {\n const edge = i < 2 ? \"right\" : \"foot\";\n const along = edge === \"right\" ? (i === 0 ? 0.32 : 0.68) : i === 2 ? 0.32 : 0.68;\n const len = u * 3;\n const thick = u * 1.4;\n return (\n {\n quoinRefs.current[i] = el;\n }}\n className=\"absolute [--travel:0px]\"\n style={\n edge === \"right\"\n ? {\n right: m * CHASE_INSET_F - thick * 0.4,\n top: `calc(${along * 100}% - ${len / 2}px)`,\n width: thick,\n height: len,\n }\n : {\n bottom: m * CHASE_INSET_F - thick * 0.4,\n left: `calc(${along * 100}% - ${len / 2}px)`,\n height: thick,\n width: len,\n }\n }\n >\n \n \n
\n );\n })}\n \n \n
\n\n \n {gutterKeys.map((key) => (\n \n ))}\n\n {rows.map((tile, i) => {\n const isHero = !compact && i === 0;\n const commonProps = {\n ref: (el: HTMLAnchorElement | HTMLButtonElement | null) => {\n if (el) tileRefs.current.set(tile.id, el);\n else tileRefs.current.delete(tile.id);\n },\n tabIndex: i === activeIdx ? 0 : -1,\n onFocus: () => setActiveIdx(i),\n onMouseEnter: () => setHoveredId(tile.id),\n onMouseLeave: () => setHoveredId((cur) => (cur === tile.id ? null : cur)),\n onKeyDown: (e: KeyboardEvent) => onKeyDown(e, i),\n className:\n \"quoin-lockup-tile group relative isolate flex flex-col justify-start gap-1 overflow-hidden rounded-sm border p-3 text-left transition-colors duration-150 \" +\n \"[--face-mix:10%] dark:[--face-mix:16%] \" +\n \"border-transparent hover:[--face-mix:12%] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-ns-accent\",\n style: {\n gridColumn: gridAreaFor(`tile-${i}`, compact, \"col\"),\n gridRow: gridAreaFor(`tile-${i}`, compact, \"row\"),\n backgroundColor: \"color-mix(in srgb, var(--background), var(--foreground) var(--face-mix))\",\n borderTopColor: \"color-mix(in srgb, var(--foreground) calc(var(--edge-o, 1) * 22%), transparent)\",\n transform:\n \"translateY(var(--sink, 0px)) scale(var(--tile-scale, 1)) rotate(var(--tile-tilt, 0deg))\",\n boxShadow: \"0 calc(var(--sink, 0px) * 0.6) calc(var(--sink, 0px) * 1.8) color-mix(in srgb, var(--foreground) calc(var(--shadow-o, 0) * 38%), transparent)\",\n zIndex: i,\n } as React.CSSProperties,\n \"aria-label\": tile.title,\n \"data-tile-id\": tile.id,\n };\n const content = (\n <>\n

\n {tile.title}\n

\n {tile.body && (\n

\n {tile.body}\n

\n )}\n \n );\n return tile.href ? (\n \n {content}\n \n ) : (\n \n );\n })}\n \n \n );\n}\n\n// Raw grid line coordinates for the fixed arrangement. Content track i (1..n)\n// sits at raw line [2i-1, 2i] once gutter tracks are interleaved between\n// every pair of content tracks. These are constants — never recomputed by\n// pressure state, only read once per render.\nfunction gridAreaFor(key: string, compact: boolean, axis: \"col\" | \"row\"): string {\n const rawLine = (content: number) => `${2 * content - 1} / ${2 * content + 1}`;\n if (compact) {\n const colOf = (c1: number, c2 = c1) => `${2 * c1 - 1} / ${2 * c2}`;\n const rowOf = (r1: number, r2 = r1) => `${2 * r1 - 1} / ${2 * r2}`;\n if (key === \"gx1\") return axis === \"col\" ? \"2 / 3\" : \"1 / 4\";\n if (key === \"gy1\") return axis === \"row\" ? \"2 / 3\" : \"1 / 4\";\n switch (key) {\n case \"tile-0\": // wide: cols 1-2, row 1\n return axis === \"col\" ? colOf(1, 2) : rowOf(1);\n case \"tile-1\": // a: col 1, row 2\n return axis === \"col\" ? colOf(1) : rowOf(2);\n case \"tile-2\": // b: col 2, row 2\n return axis === \"col\" ? colOf(2) : rowOf(2);\n default:\n return \"1 / 2\";\n }\n }\n const colOf = (c1: number, c2 = c1) => `${2 * c1 - 1} / ${2 * c2}`;\n const rowOf = (r1: number, r2 = r1) => `${2 * r1 - 1} / ${2 * r2}`;\n if (key === \"gx1\") return axis === \"col\" ? \"2 / 3\" : \"1 / 7\";\n if (key === \"gx2\") return axis === \"col\" ? \"4 / 5\" : \"1 / 6\";\n if (key === \"gy1\") return axis === \"row\" ? \"2 / 3\" : \"1 / 6\";\n if (key === \"gy2\") return axis === \"row\" ? \"4 / 5\" : \"1 / 6\";\n if (key === \"gy3\") return axis === \"row\" ? \"6 / 7\" : \"1 / 6\";\n switch (key) {\n case \"tile-0\": // hero: cols 1-2, rows 1-2\n return axis === \"col\" ? colOf(1, 2) : rowOf(1, 2);\n case \"tile-1\": // tall: col 3, rows 1-2\n return axis === \"col\" ? colOf(3) : rowOf(1, 2);\n case \"tile-2\": // wide: cols 1-2, row 3\n return axis === \"col\" ? colOf(1, 2) : rowOf(3);\n case \"tile-3\": // a: col 3, row 3\n return axis === \"col\" ? colOf(3) : rowOf(3);\n case \"tile-4\": // b: cols 1-3, row 4 — the foot course runs the full width,\n // so the chase is packed edge to edge and no cell is left inert\n return axis === \"col\" ? colOf(1, 3) : rowOf(4);\n default:\n return rawLine(1);\n }\n}\n\nQuoinLockup.displayName = \"QuoinLockup\";\n", "type": "registry:ui", "target": "components/ui/quoin-lockup.tsx" } ], "cssVars": { "theme": { "color-ns-muted": "var(--ns-muted)", "color-ns-accent": "var(--ns-accent)" }, "light": { "ns-muted": "#4d4d4d", "ns-accent": "#006bff" }, "dark": { "ns-muted": "#8f8f8f" } }, "meta": { "collection": "core", "tags": [ "grid", "layout", "bento", "letterpress", "print", "keyboard-navigation", "accessibility" ], "instruction": "Build — a bento grid borrowed from letterpress lockup on the imposing stone, where the interesting variable is PRESSURE distributing a layout that never repacks (the line separating this from grid-bento-dense/grid-bento-ascii, both re-assignment problems). FIXED ARRANGEMENT: 5 tiles on a 3-content-column x 4-content-row track grid — hero 2x2 (cols1-2,rows1-2), one 1x2 tall (col3,rows1-2), one 2x1 wide (cols1-2,row3), two 1x1 (col3 row3; col1 row4) — with the one leftover cell (cols2-3,row4) rendered as a plain furniture block, no tile: the real process packs every empty area with furniture rather than leaving it inert. A literal 3x3 (9 cells) cannot hold this tile set: 2x2 + 1x2 + 1x2 + 1x1 + 1x1 = 4+2+2+1+1 = 10 cells of area, one more than 3x3 provides, so the base grid is extended to 3x4 (12 cells) rather than dropping a tile's area to force the fit. Below M=320px (M = min(width,height)) this collapses to 3 tiles on a 2x2 base (one 2x1 wide + two 1x1). Grid tracks interleave CONTENT/GUTTER/CONTENT on both axes; every grid-column/grid-row span is a module-level constant written once — pressure only ever changes gutter TRACK SIZE via CSS custom properties (--gw-gx1/gx2/gy1/gy2/gy3) set imperatively on the grid container in a single rAF loop, never React state, so a 60fps decay never re-renders the tree. PRESSURE MODEL, a pure function of absolute elapsed time (never integrated dt, so any instant reproduces byte-identically): P decays from 0.93 to 0.62 at 0.055/s (~5.64s). At P<0.62's lift threshold a re-key phase runs: 4 quoins turn in fixed order (right-top, foot-right, right-bottom, foot-left) 640ms apart, each rotating its key 90 degrees over 320ms and stepping P by +0.19 (clamped at 0.93) over the turn's final 180ms, critically damped (smoothstep here). Full cycle ~8.2s (5.64s decay + 4*640ms=2.56s re-key), unbounded, never terminating. Every `planerEvery` cycles (default 3, every ~24.6s) a planer bar sweeps left-to-right across the form during the re-key phase's first 700ms, forcibly zeroing each tile's sink the instant the bar's x-progress passes that tile's x-fraction — the component's striking moment. FURNITURE: gutter width in u = 0.0125*M ('one pica') is quantised to the nearest of {2,3,4,6,8}*u from a target that widens linearly as P falls — never a continuous value — rendered as a color-mix(in srgb, var(--background), var(--foreground) 40%) fill with a repeating-linear-gradient butt-joint line every 0.11*M using color-mix(var(--border), var(--foreground) 30%). PIEING: each tile has a fixed seeded hold H_i = P + 0.10*JITTER[i] (JITTER = [-0.62, 0.35, -0.88, 0.71, 0.08], hardcoded, never Math.random, so the same tile always loosens first); when H_i<0.62 the tile sinks translateY up to 0.028*M, scales to 0.978 and tilts 0.9deg about a fixed per-tile axis, gated entirely by CSS custom properties (--sink/--tile-scale/--tile-tilt) so the transform composites without layout thrash. Pie depth carries two independent value cues: a box-shadow toward --foreground scaling with sink fraction (a literal loss of local contrast under the tile, not a colour), and a border-top toward color-mix(var(--foreground) 22%) that fades as sink increases (loss of edge contrast against the still-flush neighbours) — deliberately NOT the spec's literal mix(bg,fg,0.10) hairline, which sits within 1% of the tile face itself and is invisible; the edge is pushed to ~22% foreground so it has contrast to lose in the first place. QUOINS: 4 opposing-wedge pairs (2 right edge, 2 foot), each a pair of divs skewed 14 degrees (skewY on the right edge, skewX on the foot) at two different color-mix stops so the direction of travel reads without hue; the sliding half translates by up to 1.0u, driven by the same rAF loop. A small bordered key marker docks at whichever quoin is mid-turn, rotating 0-90deg over its 320ms window, opacity 0 outside the re-key phase. INTERACTION: hovering or focusing a tile steps its 1-2 adjacent gutters down one legal size (a hardcoded per-tile adjacency table, e.g. the hero borders {gx2,gy2}) — the tile's own span never changes, only the furniture around it narrows, and the creep/re-key loop keeps running underneath. Tiles are real /