{
  "id": "motion:motion-pin-scrub",
  "slug": "motion-pin-scrub",
  "kind": "motion",
  "title": {
    "ja": "ピン留め＋スクラブ",
    "en": "Pin + scrub"
  },
  "aiName": "Pin + scrub",
  "summary": {
    "ja": "画面を固定して中身だけ進む",
    "en": "Pin the screen while only the content advances"
  },
  "number": 18,
  "group": "pin-nav",
  "techniques": [
    "position-sticky",
    "scroll-progress"
  ],
  "rules": [
    {
      "ja": "固定の箱は 100vh、外の区画は 400vh を保つ（区画の高さを変えると段階の区切りがずれる）",
      "en": "Keep the sticky box at 100vh inside a 400vh section; changing the section height moves the step boundaries"
    },
    {
      "ja": "段階は進み具合 p から決め、時間では切り替えない",
      "en": "Steps are chosen from scroll progress p, never from a timer"
    },
    {
      "ja": "動きを減らす設定では固定を解除し、完成した 4 段目だけを表示する",
      "en": "Under prefers-reduced-motion, release the pin and show only the completed fourth step"
    }
  ],
  "reproduction": {
    "prompt": {
      "ja": "ピン留め＋スクラブ — Pin + scrub\n\nスクロールに応じて画面を固定し、中身だけを 4 段階で入れ替える演出を作ってください。外側の区画は高さ 400vh とし、その中に position: sticky; top: 0 の 100vh の箱を置きます。区画の上端が画面の上端に来たとき p=0、区画の下端が画面の下端に来たとき p=1 として進み具合 p（0〜1）を求め、floor(p × 4) の段階を表示します。段階の図は同じ位置に重ね、切り替えは 0.7 秒の opacity と translateY(24px) で行い、下部の 4 本の目盛りを現在の段階まで塗ります。GSAP ScrollTrigger なら `pin: true, scrub: true` で同じことができます。CSS と素の JavaScript だけで実装し、ライブラリは使わないでください。\n\n外すと崩れる点:\n- 固定の箱は 100vh、外の区画は 400vh を保つ（区画の高さを変えると段階の区切りがずれる）\n- 段階は進み具合 p から決め、時間では切り替えない\n- 動きを減らす設定では固定を解除し、完成した 4 段目だけを表示する\n\n動く実物（1 ファイルで完結する HTML）: https://design-vault.pages.dev/designs/motion-pin-scrub/demo.html",
      "en": "Pin + scrub — Pin + scrub\n\nBuild an effect that pins the screen while scrolling and swaps only the content through four steps. The outer section is 400vh tall and holds a 100vh box with position: sticky; top: 0. Compute the progress p (0 to 1) as p=0 when the section's top reaches the top of the screen and p=1 when its bottom reaches the bottom, and show step floor(p × 4). Stack the step visuals in the same place, switch them with a 0.7-second opacity and translateY(24px) transition, and fill the four ticks at the bottom up to the current step. With GSAP ScrollTrigger, `pin: true, scrub: true` does the same. Implement it with plain CSS and JavaScript only, with no library.\n\nDo not drop:\n- Keep the sticky box at 100vh inside a 400vh section; changing the section height moves the step boundaries\n- Steps are chosen from scroll progress p, never from a timer\n- Under prefers-reduced-motion, release the pin and show only the completed fourth step\n\nA working example (one self-contained HTML file): https://design-vault.pages.dev/designs/motion-pin-scrub/demo.html"
    },
    "code": {
      "url": "https://design-vault.pages.dev/designs/motion-pin-scrub/demo.html",
      "html": "<!doctype html>\n<html lang=\"ja\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n<title>18 ピン留め＋スクラブ — Pin + scrub</title>\n<style>\n/* dv-motion-base:start */\n:root {\n  --ground: #FFFFFF;\n  --surface: #F3F5F8;\n  --ink: #14181F;\n  --muted: #5A6472;\n  --accent: #1F5FA8;\n  --rule: #D8DDE4;\n  --accent-soft: color-mix(in srgb, var(--accent) 12%, var(--ground));\n  --accent-mid: color-mix(in srgb, var(--accent) 45%, var(--ground));\n  --shade: color-mix(in srgb, var(--ink) 14%, transparent);\n\n  --font: \"Zen Kaku Gothic New\", \"Hiragino Sans\", \"Noto Sans JP\", \"Yu Gothic\", system-ui, sans-serif;\n  --mono: ui-monospace, \"SF Mono\", Menlo, Consolas, monospace;\n\n  --t-label: 13px;\n  --t-body: 16px;\n  --t-lead: 20px;\n  --t-h2: 32px;\n  --t-h1: clamp(40px, 7vw, 72px);\n\n  --s1: 4px;\n  --s2: 8px;\n  --s3: 16px;\n  --s4: 24px;\n  --s5: 40px;\n  --s6: 64px;\n  --s7: 104px;\n\n  --radius: 12px;\n  --ease: cubic-bezier(.2, .7, .2, 1);\n  --dur: .7s;\n  --measure: 1080px;\n}\n*, *::before, *::after { box-sizing: border-box; }\nhtml { -webkit-text-size-adjust: 100%; }\nbody {\n  margin: 0;\n  background: var(--ground);\n  color: var(--ink);\n  font-family: var(--font);\n  font-size: var(--t-body);\n  line-height: 1.7;\n  font-feature-settings: \"palt\";\n  overflow-x: hidden;\n}\nh1, h2, h3, p, ul, ol, figure { margin: 0; padding: 0; }\nul, ol { list-style: none; }\n.dv-wrap { width: min(100% - 2 * var(--s4), var(--measure)); margin-inline: auto; }\n.dv-label {\n  min-height: 72vh;\n  display: grid;\n  align-content: center;\n  gap: var(--s3);\n  padding-block: var(--s6);\n  border-bottom: 1px solid var(--rule);\n}\n.dv-num { font-family: var(--mono); font-size: var(--t-lead); font-weight: 700; color: var(--accent); letter-spacing: .04em; }\n.dv-name { font-size: var(--t-h1); font-weight: 700; line-height: 1.15; letter-spacing: .01em; }\n.dv-ai { font-family: var(--mono); font-size: var(--t-lead); color: var(--muted); }\n.dv-desc { font-size: var(--t-lead); color: var(--ink); }\n.dv-hint { font-size: var(--t-label); color: var(--muted); letter-spacing: .12em; margin-top: var(--s4); }\n.dv-stage { padding-block: var(--s7); }\n.dv-h2 { font-size: var(--t-h2); font-weight: 700; line-height: 1.3; }\n.dv-lead { font-size: var(--t-lead); color: var(--muted); }\n.dv-eyebrow { font-family: var(--mono); font-size: var(--t-label); color: var(--accent); letter-spacing: .12em; text-transform: uppercase; }\n.dv-card { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); padding: var(--s4); }\n.dv-ph {\n  border-radius: var(--radius);\n  background: linear-gradient(135deg, var(--accent-soft), var(--accent-mid) 60%, var(--accent));\n  aspect-ratio: 16 / 9;\n}\n.dv-ph--alt { background: linear-gradient(200deg, var(--surface), var(--accent-soft) 55%, var(--accent-mid)); }\n.dv-ph--ink { background: linear-gradient(160deg, var(--ink), color-mix(in srgb, var(--ink) 55%, var(--accent))); }\n.dv-end {\n  min-height: 60vh;\n  display: grid;\n  place-items: center;\n  border-top: 1px solid var(--rule);\n  color: var(--muted);\n  font-family: var(--mono);\n  font-size: var(--t-label);\n  letter-spacing: .12em;\n}\n/* dv-motion-base:end */\n\n/* ---- この演出だけの CSS。色は var(--…) か color-mix() のみ ---- */\n.pin-zone { height: 400vh; }\n.pin-box {\n  position: sticky;\n  top: 0;\n  height: 100vh;\n  display: grid;\n  align-content: center;\n  gap: var(--s4);\n}\n.pin-steps { display: grid; }\n.pin-step {\n  grid-area: 1 / 1;\n  opacity: 0;\n  transform: translateY(24px);\n  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);\n}\n.pin-step.is-on { opacity: 1; transform: none; }\n.pin-step .dv-ph { margin-top: var(--s3); }\nhtml:not(.js) .pin-step { opacity: 1; transform: none; }\nhtml:not(.js) .pin-step + .pin-step { display: none; }\n.pin-ticks { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s2); }\n.pin-tick {\n  height: 4px;\n  border-radius: 2px;\n  background: var(--rule);\n  transition: background-color var(--dur) var(--ease);\n}\n.pin-tick.is-on { background: var(--accent); }\n\n@media (prefers-reduced-motion: reduce) {\n  .pin-zone { height: auto; }\n  .pin-box { position: static; height: auto; padding-block: var(--s7); }\n  .pin-step, .pin-step.is-on { transition: none; }\n  .pin-ticks { display: none; }\n}\n</style>\n</head>\n<body data-motion-number=\"18\">\n<header class=\"dv-label\">\n  <div class=\"dv-wrap\">\n    <p class=\"dv-num\">18</p>\n    <h1 class=\"dv-name\">ピン留め＋スクラブ</h1>\n    <p class=\"dv-ai\">Pin + scrub</p>\n    <p class=\"dv-desc\">画面を固定して中身だけ進む</p>\n    <p class=\"dv-hint\">SCROLL ↓</p>\n  </div>\n</header>\n\n<main class=\"dv-stage\">\n  <div class=\"dv-wrap\">\n    <section class=\"pin-zone\" data-progress=\"pin\">\n      <div class=\"pin-box\">\n        <div class=\"pin-steps\">\n          <article class=\"pin-step\">\n            <p class=\"dv-eyebrow\">Step 01</p>\n            <h2 class=\"dv-h2\">見出しが入ります</h2>\n            <p class=\"dv-lead\">本文のダミーです。段階ごとに中身が入れ替わります。</p>\n            <div class=\"dv-ph\"></div>\n          </article>\n          <article class=\"pin-step\">\n            <p class=\"dv-eyebrow\">Step 02</p>\n            <h2 class=\"dv-h2\">見出しが入ります</h2>\n            <p class=\"dv-lead\">本文のダミーです。画面は動かず、中身だけが進みます。</p>\n            <div class=\"dv-ph dv-ph--alt\"></div>\n          </article>\n          <article class=\"pin-step\">\n            <p class=\"dv-eyebrow\">Step 03</p>\n            <h2 class=\"dv-h2\">見出しが入ります</h2>\n            <p class=\"dv-lead\">本文のダミーです。ここまでの段階は目盛りで確かめられます。</p>\n            <div class=\"dv-ph dv-ph--ink\"></div>\n          </article>\n          <article class=\"pin-step\">\n            <p class=\"dv-eyebrow\">Step 04</p>\n            <h2 class=\"dv-h2\">見出しが入ります</h2>\n            <p class=\"dv-lead\">本文のダミーです。最後の段階で、固定が解けます。</p>\n            <div class=\"dv-ph\"></div>\n          </article>\n        </div>\n        <div class=\"pin-ticks\" aria-hidden=\"true\">\n          <span class=\"pin-tick\"></span>\n          <span class=\"pin-tick\"></span>\n          <span class=\"pin-tick\"></span>\n          <span class=\"pin-tick\"></span>\n        </div>\n      </div>\n    </section>\n  </div>\n</main>\n\n<footer class=\"dv-end\">END — 18 ピン留め＋スクラブ</footer>\n\n<script>\n/* dv-motion-helpers:start */\nconst dvReduce = matchMedia('(prefers-reduced-motion: reduce)').matches;\ndocument.documentElement.classList.add('js');\n\n/**\n * 画面に入った要素へ .is-in を付ける。\n * data-reveal=\"repeat\" の要素は画面を出たら外す（何度でも再生）。\n */\nfunction dvReveal(selector = '[data-reveal]', { threshold = 0.2, rootMargin = '0px 0px -8% 0px' } = {}) {\n  const els = [...document.querySelectorAll(selector)];\n  if (dvReduce || !('IntersectionObserver' in window)) {\n    els.forEach((el) => el.classList.add('is-in'));\n    return;\n  }\n  const io = new IntersectionObserver((entries) => {\n    for (const e of entries) {\n      if (e.isIntersecting) {\n        e.target.classList.add('is-in');\n        if (e.target.dataset.reveal !== 'repeat') io.unobserve(e.target);\n      } else if (e.target.dataset.reveal === 'repeat') {\n        e.target.classList.remove('is-in');\n      }\n    }\n  }, { threshold, rootMargin });\n  els.forEach((el) => io.observe(el));\n}\n\n/**\n * スクロール量を 0〜1 にして、各 [data-progress] 要素の CSS 変数 --p に書く。\n *   data-progress=\"through\" : 要素の上端が画面の下端に来たとき 0、下端が画面の上端を抜けたとき 1\n *   data-progress=\"pin\"     : 要素の上端が画面の上端に来たとき 0、下端が画面の下端に来たとき 1\n *                             （中に position: sticky の箱を持つ、背の高い区画用）\n *   data-progress=\"page\"    : ページ全体のスクロール量\n * onUpdate(el, p) を渡すと、値が変わるたびに呼ばれる。\n */\nfunction dvProgress(onUpdate) {\n  const els = [...document.querySelectorAll('[data-progress]')];\n  const clamp = (n) => Math.min(1, Math.max(0, n));\n  let queued = false;\n  const measure = () => {\n    queued = false;\n    const vh = window.innerHeight;\n    for (const el of els) {\n      const r = el.getBoundingClientRect();\n      let p;\n      if (el.dataset.progress === 'pin') p = r.height > vh ? -r.top / (r.height - vh) : 0;\n      else if (el.dataset.progress === 'page') {\n        const max = document.documentElement.scrollHeight - vh;\n        p = max > 0 ? window.scrollY / max : 0;\n      } else p = (vh - r.top) / (vh + r.height);\n      p = clamp(p);\n      el.style.setProperty('--p', p.toFixed(4));\n      if (onUpdate) onUpdate(el, p);\n    }\n  };\n  const request = () => {\n    if (!queued) { queued = true; requestAnimationFrame(measure); }\n  };\n  addEventListener('scroll', request, { passive: true });\n  addEventListener('resize', request);\n  measure();\n}\n/* dv-motion-helpers:end */\n\n/* ---- この演出だけの JS ---- */\ndvProgress((el, p) => {\n  const k = dvReduce ? 3 : Math.min(3, Math.floor(p * 4));\n  el.querySelectorAll('.pin-step').forEach((s, i) => s.classList.toggle('is-on', i === k));\n  el.querySelectorAll('.pin-tick').forEach((t, i) => t.classList.toggle('is-on', i <= k));\n});\n</script>\n</body>\n</html>\n"
    }
  },
  "license": "Original",
  "catalogVersion": 1,
  "designSchemaVersion": 2,
  "capabilities": [
    "live-preview",
    "copy-prompt",
    "get-code"
  ],
  "reusePolicy": "construction-reuse",
  "urls": {
    "ja": "https://design-vault.pages.dev/designs/motion-pin-scrub",
    "en": "https://design-vault.pages.dev/en/designs/motion-pin-scrub",
    "json": "https://design-vault.pages.dev/ai/assets/motion-pin-scrub.json",
    "designJson": null
  }
}