{
  "id": "motion:motion-letters-scatter",
  "slug": "motion-letters-scatter",
  "kind": "motion",
  "title": {
    "ja": "文字の集合",
    "en": "Letters scatter"
  },
  "aiName": "Scattered letters snap into place",
  "summary": {
    "ja": "散らばった文字が回りながら整列する",
    "en": "Letters scattered in every direction spin back and line up"
  },
  "number": 51,
  "group": "text-motion",
  "techniques": [
    "scroll-progress",
    "css-3d"
  ],
  "rules": [
    {
      "ja": "散った姿は固定の乱数で決め、戻したときに同じ位置へ散る",
      "en": "Fix each scattered pose from a seeded random so scrolling back scatters to the same places"
    },
    {
      "ja": "舞台は overflow: clip にして、はみ出した字で横スクロールを出さない",
      "en": "Clip the stage with overflow: clip so flung characters never create a horizontal scrollbar"
    },
    {
      "ja": "整列し終えた字は transform を 0 にそろえ、1 文字もずれたまま残さない",
      "en": "Settled characters end at exactly zero transform; none stays offset"
    },
    {
      "ja": "本物の文は aria-label に残し、動きを減らす設定では整列した状態で止める",
      "en": "Keep the real text in aria-label, and stop on the aligned state with reduced motion"
    }
  ],
  "reproduction": {
    "prompt": {
      "ja": "文字の集合 — Scattered letters snap into place\n\n四方に散らばった文字が、回りながら戻って一列に整列する動きを作ってください。日本語の見出しと小さな英文を 1 字ずつ inline-block に割り、字ごとに固定の乱数で散った姿（横 ±42vw、縦 ±42vh、回転 ±260°、Y 軸の回転 ±120°、拡大率 0.5〜2.7）と戻り始めの遅れ（0〜0.35）を決めます。360vh の pin 区画の進み p から、字ごとの時間 t = clamp((p / 0.8 − 遅れ) / 0.65) を出し、easeOut（1 − (1 − t)⁴）で散った姿から整列した姿へ補間します。各字の transform の先頭に perspective(900px) を付けて奥行きを出し、不透明度は 0.15 から t に応じて 1 まで上げ、散っている字はアクセント色、整列し終えた字だけ本来の色にします。横へはみ出した字で横スクロールが出ないよう、舞台は overflow: clip にします。本物の文は aria-label に残し、動きを減らす設定では整列した状態で見せます。CSS と 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- 散った姿は固定の乱数で決め、戻したときに同じ位置へ散る\n- 舞台は overflow: clip にして、はみ出した字で横スクロールを出さない\n- 整列し終えた字は transform を 0 にそろえ、1 文字もずれたまま残さない\n- 本物の文は aria-label に残し、動きを減らす設定では整列した状態で止める\n\n動く実物（1 ファイルで完結する HTML）: https://design-vault.pages.dev/designs/motion-letters-scatter/demo.html",
      "en": "Letters scatter — Scattered letters snap into place\n\nMake letters scattered in every direction spin back and line up in a row. Split a Japanese heading and a small English line into inline-block characters, and give each character a fixed seeded scattered pose (±42vw horizontally, ±42vh vertically, ±260° rotation, ±120° Y-rotation, scale 0.5–2.7) and a return delay of 0–0.35. In a 360vh pinned section compute a per-character time t = clamp((p / 0.8 − delay) / 0.65) and interpolate from the scattered pose to the aligned one with an ease-out, 1 − (1 − t)⁴. Prefix each character’s transform with perspective(900px) for depth, raise opacity from 0.15 to 1 with t, and keep scattered characters accent-coloured so that only settled ones take their final colour. Clip the stage with overflow: clip so that characters flung sideways never produce a horizontal scrollbar. Keep the real text in aria-label, and with reduced motion show the aligned state. Implement it with CSS and JavaScript only, without any library.\n\nDo not drop:\n- Fix each scattered pose from a seeded random so scrolling back scatters to the same places\n- Clip the stage with overflow: clip so flung characters never create a horizontal scrollbar\n- Settled characters end at exactly zero transform; none stays offset\n- Keep the real text in aria-label, and stop on the aligned state with reduced motion\n\nA working example (one self-contained HTML file): https://design-vault.pages.dev/designs/motion-letters-scatter/demo.html"
    },
    "code": {
      "url": "https://design-vault.pages.dev/designs/motion-letters-scatter/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>51 文字の集合 — Scattered letters snap into place</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.stack { display: grid; gap: var(--s6); }\n.ls-zone { height: 360vh; }\n.ls-stick { position: sticky; top: 0; height: 100vh; display: grid; place-content: center; gap: var(--s4); overflow: clip; }\n.ls-line { display: flex; justify-content: center; font-size: clamp(30px, 9vw, 120px); font-weight: 700; line-height: 1.2; }\n.ls-line--sub { font-size: clamp(18px, 3.4vw, 36px); color: var(--muted); }\n.ls-ch { display: inline-block; will-change: transform, opacity; color: var(--accent); transition: color .3s var(--ease); }\n.ls-ch.is-set { color: var(--ink); }\n.ls-line--sub .ls-ch.is-set { color: var(--muted); }\n\n@media (prefers-reduced-motion: reduce) {\n  .ls-ch { color: var(--ink); }\n  .ls-zone { height: auto; }\n  .ls-stick { position: static; height: auto; padding-block: var(--s6); }\n}\n</style>\n</head>\n<body data-motion-number=\"51\">\n<header class=\"dv-label\">\n  <div class=\"dv-wrap\">\n    <p class=\"dv-num\">51</p>\n    <h1 class=\"dv-name\">文字の集合</h1>\n    <p class=\"dv-ai\">Scattered letters snap into place</p>\n    <p class=\"dv-desc\">散らばった文字が回りながら整列する</p>\n    <p class=\"dv-hint\">SCROLL ↓</p>\n  </div>\n</header>\n\n<main class=\"dv-stage\">\n<div class=\"dv-wrap stack\">\n    <section class=\"dv-card\">\n      <p class=\"dv-eyebrow\">Section 1</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。スクロールすると、四方に散った文字が回りながら戻り、一列に揃います。</p>\n    </section>\n  </div>\n\n  <section class=\"ls-zone\" data-progress=\"pin\">\n    <div class=\"ls-stick\">\n      <div class=\"dv-wrap\">\n        <p class=\"ls-line\" data-scatter role=\"img\" aria-label=\"言葉が集まる\">言葉が集まる</p>\n        <p class=\"ls-line ls-line--sub\" data-scatter role=\"img\" aria-label=\"Letters find their place\">Letters find their place</p>\n      </div>\n    </div>\n  </section>\n\n  <div class=\"dv-wrap stack\">\n    <section class=\"dv-card\">\n      <p class=\"dv-eyebrow\">Section 2</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。揃った文字は、そのまま留まります。</p>\n    </section>\n  </div>\n</main>\n\n<footer class=\"dv-end\">END — 51 文字の集合</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 ---- */\nfunction seeded(seed) {\n  return () => {\n    seed = (seed + 0x6d2b79f5) | 0;\n    let t = Math.imul(seed ^ (seed >>> 15), 1 | seed);\n    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;\n    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;\n  };\n}\nconst rnd = seeded(5);\n// 1 字ずつ <span> に割り、散らばった姿（位置・回転・奥行き）を字ごとに決めておく。\nconst chars = [];\ndocument.querySelectorAll('[data-scatter]').forEach((el) => {\n  const text = el.textContent;\n  el.textContent = '';\n  for (const ch of text) {\n    const s = document.createElement('span');\n    s.className = 'ls-ch';\n    s.setAttribute('aria-hidden', 'true');\n    s.textContent = ch === ' ' ? ' ' : ch;\n    el.append(s);\n    chars.push({\n      el: s,\n      x: (rnd() - 0.5) * 2 * 42,    // vw\n      y: (rnd() - 0.5) * 2 * 42,    // vh\n      r: (rnd() - 0.5) * 2 * 260,   // deg\n      ry: (rnd() - 0.5) * 2 * 120,\n      s: 0.5 + rnd() * 2.2,\n      d: rnd() * 0.35,              // 戻り始めの遅れ\n    });\n  }\n});\nconst easeOut = (t) => 1 - Math.pow(1 - t, 4);\nfunction place(p) {\n  for (const c of chars) {\n    const t = Math.min(1, Math.max(0, (p / 0.8 - c.d) / 0.65));\n    const k = 1 - easeOut(t);          // 1 = 散っている、0 = 揃った\n    c.el.style.transform = `perspective(900px) translate(${(c.x * k).toFixed(2)}vw, ${(c.y * k).toFixed(2)}vh) rotate(${(c.r * k).toFixed(1)}deg) rotateY(${(c.ry * k).toFixed(1)}deg) scale(${(1 + (c.s - 1) * k).toFixed(3)})`;\n    c.el.style.opacity = String(Math.min(1, 0.15 + t * 2));\n    c.el.classList.toggle('is-set', t >= 1);\n  }\n}\nif (!dvReduce) dvProgress((el, p) => place(p));\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-letters-scatter",
    "en": "https://design-vault.pages.dev/en/designs/motion-letters-scatter",
    "json": "https://design-vault.pages.dev/ai/assets/motion-letters-scatter.json",
    "designJson": null
  }
}