{
  "id": "motion:motion-horizontal-scroll",
  "slug": "motion-horizontal-scroll",
  "kind": "motion",
  "title": {
    "ja": "横スクロール",
    "en": "Horizontal scroll"
  },
  "aiName": "Horizontal scroll",
  "summary": {
    "ja": "縦スクロールで横に流れる",
    "en": "Vertical scrolling drives a horizontal strip"
  },
  "number": 22,
  "group": "pin-nav",
  "techniques": [
    "scroll-progress",
    "position-sticky"
  ],
  "rules": [
    {
      "ja": "帯は縦スクロールの量だけ動く。ボタンやドラッグでは動かさない",
      "en": "The strip moves only with vertical scroll; no buttons or drag"
    },
    {
      "ja": "overflow: hidden は sticky の箱にだけ付け、祖先には付けない",
      "en": "Put overflow: hidden on the sticky box only, never on an ancestor, or sticky stops working"
    },
    {
      "ja": "動きを減らす設定では帯を止め、カードを折り返して縦に並べる",
      "en": "Under reduced motion, stop the strip and wrap the cards into a static grid"
    }
  ],
  "reproduction": {
    "prompt": {
      "ja": "横スクロール — Horizontal scroll\n\n縦スクロールの距離を取るため、高さ 400vh の区画を置き、その中に 100vh の sticky な箱を入れる。\n箱の中の横長の帯（カード 5 枚、各 min(82vw, 760px) 幅、間隔 40px）を、スクロール量 0〜1 の CSS 変数 --p で transform: translateX(calc(var(--p) * -1 * (100% - 100vw))) として左へ動かす。\nsticky の箱には overflow: hidden を付けて横スクロールバーを出さず、縦のスクロール以外では動かさない。\nCSS 変数の更新は小さな scroll リスナーだけで行い、ライブラリは使わない。\n\n外すと崩れる点:\n- 帯は縦スクロールの量だけ動く。ボタンやドラッグでは動かさない\n- overflow: hidden は sticky の箱にだけ付け、祖先には付けない\n- 動きを減らす設定では帯を止め、カードを折り返して縦に並べる\n\n動く実物（1 ファイルで完結する HTML）: https://design-vault.pages.dev/designs/motion-horizontal-scroll/demo.html",
      "en": "Horizontal scroll — Horizontal scroll\n\nCreate a 400vh section and place a 100vh sticky box inside it to take up the vertical scroll distance.\nInside the box, slide a wide strip of five cards (each min(82vw, 760px) wide, 40px apart) to the left with transform: translateX(calc(var(--p) * -1 * (100% - 100vw))), where --p is the 0 to 1 scroll progress.\nGive the sticky box overflow: hidden so no horizontal scrollbar appears, and move the strip only with vertical scrolling.\nUpdate --p from one small passive scroll listener; no library.\n\nDo not drop:\n- The strip moves only with vertical scroll; no buttons or drag\n- Put overflow: hidden on the sticky box only, never on an ancestor, or sticky stops working\n- Under reduced motion, stop the strip and wrap the cards into a static grid\n\nA working example (one self-contained HTML file): https://design-vault.pages.dev/designs/motion-horizontal-scroll/demo.html"
    },
    "code": {
      "url": "https://design-vault.pages.dev/designs/motion-horizontal-scroll/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>22 横スクロール — Horizontal scroll</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.hs-pin { height: 400vh; }\n.hs-sticky {\n  position: sticky;\n  top: 0;\n  height: 100vh;\n  overflow: hidden;\n  display: grid;\n  align-content: center;\n}\n.hs-track {\n  display: flex;\n  gap: var(--s5);\n  width: max-content;\n  padding-inline: var(--s4);\n  transform: translateX(calc(var(--p) * -1 * (100% - 100vw)));\n}\n.hs-card {\n  flex: 0 0 min(82vw, 760px);\n  height: min(60vh, 520px);\n  display: grid;\n  grid-template-rows: auto auto minmax(0, 1fr);\n  gap: var(--s3);\n  padding: var(--s4);\n  background: var(--surface);\n  border: 1px solid var(--rule);\n  border-radius: var(--radius);\n}\n.hs-card .dv-ph { aspect-ratio: auto; min-height: 0; }\n\n@media (prefers-reduced-motion: reduce) {\n  .hs-pin { height: auto; }\n  .hs-sticky { position: static; height: auto; overflow: visible; }\n  .hs-track { width: auto; flex-wrap: wrap; transform: none; }\n}\n</style>\n</head>\n<body data-motion-number=\"22\">\n<header class=\"dv-label\">\n  <div class=\"dv-wrap\">\n    <p class=\"dv-num\">22</p>\n    <h1 class=\"dv-name\">横スクロール</h1>\n    <p class=\"dv-ai\">Horizontal scroll</p>\n    <p class=\"dv-desc\">縦スクロールで横に流れる</p>\n    <p class=\"dv-hint\">SCROLL ↓</p>\n  </div>\n</header>\n\n<main class=\"dv-stage\">\n  <section class=\"hs-pin\" data-progress=\"pin\">\n    <div class=\"hs-sticky\">\n      <div class=\"hs-track\">\n        <article class=\"hs-card\">\n          <p class=\"dv-eyebrow\">Panel 01</p>\n          <h2 class=\"dv-h2\">見出しが入ります</h2>\n          <div class=\"dv-ph\"></div>\n        </article>\n        <article class=\"hs-card\">\n          <p class=\"dv-eyebrow\">Panel 02</p>\n          <h2 class=\"dv-h2\">見出しが入ります</h2>\n          <div class=\"dv-ph dv-ph--alt\"></div>\n        </article>\n        <article class=\"hs-card\">\n          <p class=\"dv-eyebrow\">Panel 03</p>\n          <h2 class=\"dv-h2\">見出しが入ります</h2>\n          <div class=\"dv-ph dv-ph--ink\"></div>\n        </article>\n        <article class=\"hs-card\">\n          <p class=\"dv-eyebrow\">Panel 04</p>\n          <h2 class=\"dv-h2\">見出しが入ります</h2>\n          <div class=\"dv-ph\"></div>\n        </article>\n        <article class=\"hs-card\">\n          <p class=\"dv-eyebrow\">Panel 05</p>\n          <h2 class=\"dv-h2\">見出しが入ります</h2>\n          <div class=\"dv-ph dv-ph--alt\"></div>\n        </article>\n      </div>\n    </div>\n  </section>\n  <div class=\"dv-wrap\">\n    <p class=\"dv-lead\">帯が右端まで流れ切ると、縦スクロールが通常どおり戻ります。</p>\n  </div>\n</main>\n\n<footer class=\"dv-end\">END — 22 横スクロール</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();\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-horizontal-scroll",
    "en": "https://design-vault.pages.dev/en/designs/motion-horizontal-scroll",
    "json": "https://design-vault.pages.dev/ai/assets/motion-horizontal-scroll.json",
    "designJson": null
  }
}