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Four cards deep this reaches 0.84, still wide // enough that the stack reads as cards rather than a fan. const SCALE_PER_CARD = 0.04; const DIM_PER_CARD = 0.12; const MAX_DIM = 0.4; const top = (i: number) => FIRST_TOP + i * STEP; const natural = (i: number) => HEADER + i * (CARD + GAP); export function StickyStack({ items, label, heading, className, }: { items: StackItem[]; label: string; heading?: React.ReactNode; className?: string; }) { const reduceMotion = useReducedMotion(); const scroller = useRef(null); const cards = useRef<(HTMLElement | null)[]>([]); const shades = useRef<(HTMLElement | null)[]>([]); const fills = useRef<(HTMLElement | null)[]>([]); const dots = useRef<(HTMLElement | null)[]>([]); const last = items.length - 1; // Just enough room below the last card for it to reach its stuck spot, so // the scroll ends exactly as the stack completes. const bottomPad = VIEWPORT - CARD - top(last); useEffect(() => { const el = scroller.current; if (!el) return; let frame = 0; let current = -1; // One read (scrollTop) and a batch of transform and opacity writes per // frame, nothing that triggers layout. const update = () => { frame = 0; const s = el.scrollTop; // How far card i + 1 has slid over card i, 0 to 1: from its top edge // meeting card i's bottom edge until it sticks. const covered = items.map((_, i) => { if (i === last) return 0; const start = natural(i + 1) - top(i) - CARD; const end = natural(i + 1) - top(i + 1); return Math.min(Math.max((s - start) / (end - start), 0), 1); }); let depth = 0; for (let i = last; i >= 0; i--) { depth += covered[i]; const card = cards.current[i]; const shade = shades.current[i]; if (card) { card.style.transform = reduceMotion ? "" : `scale(${1 - depth * SCALE_PER_CARD})`; } if (shade) { shade.style.opacity = reduceMotion ? "0" : String(Math.min(depth * DIM_PER_CARD, MAX_DIM)); } const fill = fills.current[i]; if (fill) { const arrived = i === 0 ? 1 : covered[i - 1]; fill.style.transform = `scaleY(${arrived})`; } } const front = covered.filter((c) => c >= 0.5).length; if (front !== current) { dots.current[current]?.removeAttribute("aria-current"); dots.current[front]?.setAttribute("aria-current", "step"); current = front; } }; const onScroll = () => { if (!frame) frame = requestAnimationFrame(update); }; update(); el.addEventListener("scroll", onScroll, { passive: true }); return () => { el.removeEventListener("scroll", onScroll); cancelAnimationFrame(frame); }; }, [items, last, reduceMotion]); const goTo = (i: number) => { scroller.current?.scrollTo({ top: i === 0 ? 0 : natural(i) - top(i), behavior: reduceMotion ? "auto" : "smooth", }); }; return (

{heading}

{items.map((item, i) => (

{ cards.current[i] = node; }} className="sticky flex origin-top flex-col justify-between rounded-2xl bg-background p-6 shadow-raised will-change-transform" style={{ top: top(i), height: CARD, marginTop: i === 0 ? 0 : GAP, }} > {String(i + 1).padStart(2, "0")}

{item.title}

{item.text}

{ shades.current[i] = node; }} aria-hidden className="pointer-events-none absolute inset-0 rounded-[inherit] bg-black opacity-0" />

))}

{items.map((item, i) => ( ))}

); } const PRINCIPLES: StackItem[] = [ { title: "Respond on press", text: "Feedback starts the moment a finger lands, not when it lifts.", }, { title: "Stay interruptible", text: "Anything in motion can be grabbed mid flight and sent somewhere else.", }, { title: "Keep the velocity", text: "A release carries on at exactly the speed the hand gave it.", }, { title: "Leave the way you came", text: "What slides in from the right goes back out to the right.", }, { title: "Show restraint", text: "Motion people see a hundred times a day should barely be there.", }, ]; export default function StickyStackDemo() { return (

Five principles of motion

Scroll to stack them up.

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