/* 紹介ページ（/about/）の見た目。色はアプリの src/constants/colors.ts と揃える */
:root {
  --green: #10b981;
  --green-text: #059669;
  --green-deep: #065f46;
  --green-soft: #ecfdf5;
  --green-border: #a7f3d0;
  --ink: #111827;
  --body: #374151;
  --muted: #6b7280;
  --line: #e5e7eb;
  --bg: #ffffff;
  --bg-soft: #f9fafb;
  --radius: 16px;
  --max: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  overflow-wrap: anywhere;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--green-text); }

h1, h2, h3 { color: var(--ink); line-height: 1.4; margin: 0; }

p { margin: 0; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* --- ナビ --- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 16px; height: 56px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--ink); text-decoration: none; font-size: 18px; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.nav-links { display: none; gap: 20px; margin-left: auto; }
.nav-links a { color: var(--body); text-decoration: none; font-size: 14px; }
.nav-links a:hover { color: var(--green-text); }
.nav-start {
  margin-left: auto;
  background: var(--green); color: #fff; text-decoration: none;
  font-size: 14px; font-weight: 700; padding: 6px 16px; border-radius: 999px;
}
@media (min-width: 760px) {
  .nav-links { display: flex; }
  .nav-start { margin-left: 0; }
}

/* --- ボタン --- */
.buttons { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 10px 22px; border-radius: 12px;
  font-weight: 700; font-size: 16px; text-decoration: none;
}
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-text); }
.btn-secondary { background: #fff; color: var(--green-text); border: 1.5px solid var(--green); }
.btn-secondary:hover { background: var(--green-soft); }

/* --- ヒーロー --- */
.hero { background: linear-gradient(180deg, var(--green-soft) 0%, #fff 100%); padding: 40px 0 32px; }
.hero-grid { display: grid; gap: 28px; }
.hero h1 { font-size: 30px; letter-spacing: 0.01em; }
/* 言葉の途中で折り返さない（句ごとにまとめて送る） */
.hero h1 span { display: inline-block; }
.hero-lead { margin-top: 14px; font-size: 17px; }
.hero .buttons { margin-top: 22px; }
.hero-note { margin-top: 10px; font-size: 13px; color: var(--muted); }
.demo { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: 0 8px 24px rgba(17, 24, 39, 0.08); }
.demo-caption { padding: 10px 14px; font-size: 13px; color: var(--muted); border-bottom: 1px solid var(--line); background: var(--bg-soft); }
.demo iframe { display: block; width: 100%; height: 560px; border: 0; }
@media (min-width: 900px) {
  .hero { padding: 64px 0 48px; }
  .hero-grid { grid-template-columns: 1fr 1fr; align-items: center; gap: 40px; }
  .hero h1 { font-size: 40px; }
  .demo iframe { height: 600px; }
}

/* --- 節の共通 --- */
section { padding: 48px 0; }
.section-soft { background: var(--bg-soft); }
.section-title { font-size: 24px; text-align: center; }
.section-lead { margin: 12px auto 0; max-width: 640px; text-align: center; }
@media (min-width: 900px) {
  section { padding: 72px 0; }
  .section-title { font-size: 30px; }
}

/* --- 困りごと --- */
.pains { list-style: none; margin: 24px auto 0; padding: 0; max-width: 640px; display: grid; gap: 10px; }
.pains li { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.pains-close { margin: 20px auto 0; max-width: 640px; text-align: center; font-weight: 700; color: var(--green-deep); }

/* --- カードの並び --- */
.cards { margin-top: 28px; display: grid; gap: 14px; grid-template-columns: 1fr; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.card h3 { font-size: 17px; }
.card p { margin-top: 8px; font-size: 15px; }
.card-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--green-soft); color: var(--green-text); display: flex; align-items: center; justify-content: center; margin-bottom: 12px; }
.card-icon svg { width: 22px; height: 22px; }
.card-strong { border-color: var(--green-border); }
@media (min-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .cards-3 { grid-template-columns: 1fr 1fr 1fr; } .cards-4 { grid-template-columns: repeat(4, 1fr); } }

/* 小さく推す機能 */
.minor-title { margin-top: 40px; font-size: 18px; text-align: center; }
.minor { margin-top: 16px; display: grid; gap: 12px; }
.minor div { border-left: 3px solid var(--green-border); padding: 2px 0 2px 14px; }
.minor h3 { font-size: 15px; }
.minor p { font-size: 14px; color: var(--muted); }
@media (min-width: 760px) { .minor { grid-template-columns: 1fr 1fr 1fr; } }

/* --- 3ステップ --- */
.steps { list-style: none; counter-reset: step; margin: 28px auto 0; padding: 0; max-width: 720px; display: grid; gap: 14px; }
.steps li { counter-increment: step; position: relative; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 18px 18px 68px; }
.steps li::before {
  content: counter(step); position: absolute; left: 18px; top: 18px;
  width: 36px; height: 36px; border-radius: 50%; background: var(--green); color: #fff;
  font-weight: 700; display: flex; align-items: center; justify-content: center;
}
.steps strong { color: var(--ink); }
.inline-cta { margin-top: 20px; text-align: center; font-size: 15px; }

/* --- 画面 --- */
.shots { margin-top: 28px; display: flex; gap: 14px; overflow-x: auto; padding-bottom: 8px; scroll-snap-type: x mandatory; }
.shots img { flex: 0 0 62%; max-width: 280px; border-radius: 14px; border: 1px solid var(--line); scroll-snap-align: center; }
@media (min-width: 760px) { .shots { justify-content: center; overflow: visible; } .shots img { flex: 0 0 240px; } }

/* --- ほかのダンスでも --- */
.other { margin: 32px auto 0; max-width: 720px; background: var(--green-soft); border: 1px solid var(--green-border); border-radius: var(--radius); padding: 20px; }
.other h3 { font-size: 17px; color: var(--green-deep); }
.other p { margin-top: 8px; font-size: 15px; }

/* --- よくある質問 --- */
.faq { margin: 28px auto 0; max-width: 760px; display: grid; gap: 10px; }
.faq details { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 0 16px; }
.faq summary { cursor: pointer; list-style: none; padding: 14px 28px 14px 0; font-weight: 700; color: var(--ink); position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: 4px; top: 50%; width: 8px; height: 8px;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: translateY(-70%) rotate(45deg); transition: transform 0.15s;
}
.faq details[open] summary::after { transform: translateY(-30%) rotate(225deg); }
.faq details p { padding: 0 0 14px; font-size: 15px; }

/* --- 最後の CTA --- */
.final { text-align: center; background: var(--green-soft); }
.final .buttons { justify-content: center; margin-top: 22px; }

/* --- フッター --- */
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; font-size: 14px; color: var(--muted); }
.footer-name { font-weight: 700; color: var(--ink); }
.footer-links { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.footer-links a { color: var(--body); text-decoration: none; }
.footer-links a:hover { color: var(--green-text); text-decoration: underline; }

/* 見出しは言葉の途中で折り返さず、行の長さを揃える（対応していないブラウザでは何もしない） */
h1, h2, h3 { word-break: auto-phrase; text-wrap: balance; }

/* --- ヒーローの下の3つの印 --- */
.chips { list-style: none; margin: 16px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { background: #fff; border: 1px solid var(--green-border); color: var(--green-deep); border-radius: 999px; padding: 4px 14px; font-size: 13px; font-weight: 700; }

/* --- 3つの特徴 --- */
.pillars { margin-top: 28px; display: grid; gap: 14px; }
.pillar { background: #fff; border: 1.5px solid var(--green-border); border-radius: var(--radius); padding: 22px; }
.pillar-label { font-size: 12px; font-weight: 700; letter-spacing: 0.08em; color: var(--green-text); }
.pillar h3 { margin-top: 6px; font-size: 19px; }
.pillar p { margin-top: 10px; font-size: 15px; }
@media (min-width: 860px) { .pillars { grid-template-columns: 1fr 1fr 1fr; } }

/* --- 困りごと（4枚のカード） --- */
.pain-cards { margin-top: 28px; display: grid; gap: 12px; }
.pain-cards div { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.pain-cards h3 { font-size: 16px; }
.pain-cards p { margin-top: 6px; font-size: 14px; color: var(--muted); }
@media (min-width: 640px) { .pain-cards { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .pain-cards { grid-template-columns: repeat(4, 1fr); } }

/* --- 主な機能（説明と画面を横に並べる） --- */
.feature { margin-top: 36px; display: grid; gap: 18px; align-items: center; }
.feature-number { font-size: 13px; font-weight: 700; color: var(--green-text); letter-spacing: 0.08em; }
.feature h3 { margin-top: 4px; font-size: 21px; }
.feature p { margin-top: 10px; }
.feature img { width: 100%; max-width: 260px; margin: 0 auto; border-radius: 14px; border: 1px solid var(--line); }
@media (min-width: 760px) {
  .feature { grid-template-columns: 1fr 280px; gap: 48px; margin-top: 56px; }
  .feature:nth-of-type(even) { grid-template-columns: 280px 1fr; }
  .feature:nth-of-type(even) .feature-text { order: 2; }
  .features-list { max-width: 880px; margin: 0 auto; }
}

/* --- 使う人ごとの3ステップ --- */
.personas { margin-top: 28px; display: grid; gap: 14px; }
.persona { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.persona h3 { font-size: 18px; }
.persona-lead { margin-top: 8px; font-size: 15px; }
.persona ol { margin: 14px 0 0; padding: 0; list-style: none; counter-reset: pstep; display: grid; gap: 10px; }
.persona li { counter-increment: pstep; position: relative; padding-left: 36px; font-size: 15px; }
.persona li::before {
  content: counter(pstep); position: absolute; left: 0; top: 2px;
  width: 24px; height: 24px; border-radius: 50%; background: var(--green); color: #fff;
  font-size: 13px; font-weight: 700; display: flex; align-items: center; justify-content: center;
}
@media (min-width: 900px) { .personas { grid-template-columns: 1fr 1fr 1fr; } }

/* --- 大きな数字 --- */
.numbers { margin-top: 28px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; max-width: 560px; margin-left: auto; margin-right: auto; }
.number { background: var(--green-soft); border: 1px solid var(--green-border); border-radius: var(--radius); padding: 18px 12px; text-align: center; }
.number strong { display: block; font-size: 44px; line-height: 1.1; color: var(--green-deep); }
.number strong span { font-size: 18px; margin-left: 2px; }
.number p { margin-top: 6px; font-size: 13px; color: var(--body); }
.final-lead { margin: 12px auto 0; max-width: 560px; }
.final-note { margin-top: 12px; font-size: 13px; color: var(--muted); }

/* --- スマホの画面の枠（機能の横の画像） --- */
.feature img.phone-shot { border: 6px solid #111827; border-radius: 26px; }

/* --- どの端末でも使える（パソコン・タブレット・スマホを並べる） --- */
.devices { margin: 32px auto 0; max-width: 920px; display: flex; align-items: flex-end; justify-content: center; gap: 3%; }
.device { margin: 0; text-align: center; }
.device figcaption { margin-top: 10px; font-size: 13px; font-weight: 700; color: var(--body); }
.device-screen { background: #111827; overflow: hidden; }
.device-screen img { width: 100%; }
.device-laptop { flex: 0 1 58%; }
.device-laptop .device-screen { padding: 2.2% 2.2% 0; border-radius: 12px 12px 0 0; aspect-ratio: 16 / 10.4; }
.device-laptop .device-screen img { height: 100%; object-fit: cover; object-position: top; border-radius: 4px 4px 0 0; }
/* キーボード側の板 */
.device-base { height: 10px; margin: 0 -6%; background: #d1d5db; border-radius: 0 0 12px 12px; }
.device-laptop { padding: 0 3.5%; }
.device-tablet { flex: 0 1 24%; }
.device-tablet .device-screen { padding: 5%; border-radius: 14px; }
.device-tablet .device-screen img { border-radius: 6px; }
.device-phone { flex: 0 1 13%; }
.device-phone .device-screen { padding: 6%; border-radius: 16px; }
.device-phone .device-screen img { border-radius: 10px; }
@media (max-width: 520px) {
  .devices { gap: 2%; }
  .device figcaption { font-size: 11px; }
}

/* --- 機能の横の画像: 横長（PC・タブレット）とスマホの2枚を重ねて見せる --- */
.pair { position: relative; padding: 0 0 8% 0; margin: 0 auto; width: 100%; max-width: 520px; }
.pair-wide { width: 88%; border: 6px solid #111827; border-radius: 14px; overflow: hidden; background: #111827; }
.pair-wide img, .pair-phone img { width: 100%; max-width: none; margin: 0; border: 0; border-radius: 0; }
.pair-phone { position: absolute; right: 0; bottom: 0; width: 27%; border: 5px solid #111827; border-radius: 16px; overflow: hidden; background: #111827; box-shadow: 0 8px 20px rgba(17, 24, 39, 0.25); }
@media (min-width: 760px) {
  .feature { grid-template-columns: 1fr 1.15fr; }
  .feature:nth-of-type(even) { grid-template-columns: 1.15fr 1fr; }
  .features-list { max-width: 1000px; }
}

/* --- 端末の節: タブレットは横向き --- */
.device-laptop { flex: 0 1 50%; }
.device-tablet { flex: 0 1 31%; }
.device-tablet .device-screen { padding: 3.5%; border-radius: 12px; }
.device-phone { flex: 0 1 11%; }
.sync { margin: 24px auto 0; max-width: 720px; display: flex; gap: 12px; align-items: flex-start; background: #fff; border: 1px solid var(--green-border); border-radius: var(--radius); padding: 16px 18px; }
.sync svg { flex: 0 0 auto; color: var(--green-text); margin-top: 4px; }
.sync p { font-size: 15px; }
.sync strong { color: var(--green-deep); }

/* --- ページ内リンクで飛んだとき、固定のナビに見出しが隠れないようにする --- */
section[id] { scroll-margin-top: 72px; }

/* --- スマホではページ内リンクを横に送れる1行で出す --- */
@media (max-width: 759px) {
  .nav-inner { flex-wrap: wrap; height: auto; padding-top: 8px; row-gap: 4px; }
  .nav-links { display: flex; order: 3; flex: 0 0 100%; margin-left: 0; gap: 18px; overflow-x: auto; padding: 4px 0 8px; white-space: nowrap; }
  section[id] { scroll-margin-top: 96px; }
}

/* --- AI の取り込み: 紙の隊形図 → 編集できる隊形 --- */
.flow { margin: 28px auto 0; max-width: 920px; display: grid; gap: 14px; align-items: center; }
.flow-step { margin: 0; }
.flow-image { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: 0 6px 18px rgba(17, 24, 39, 0.06); }
/* 立ち位置や名前が切れないよう、枠に収めて全体を見せる */
.flow-image img { width: 100%; aspect-ratio: 720 / 630; object-fit: contain; object-position: top; background: #f9fafb; }
.flow-step figcaption { margin-top: 10px; text-align: center; font-size: 13px; color: var(--muted); }
.flow-step figcaption strong { display: block; font-size: 16px; color: var(--ink); }
.flow-arrow { display: flex; flex-direction: column; align-items: center; gap: 2px; color: var(--green-text); font-size: 13px; font-weight: 700; }
.flow-arrow svg { transform: rotate(90deg); }
@media (min-width: 760px) {
  .flow { grid-template-columns: 1fr auto 1fr; gap: 20px; }
  .flow-arrow svg { transform: none; }
}

/* 端末の節の下の3つ */
.minor-3 { max-width: 920px; margin: 24px auto 0; }

/* --- 困りごと: 今まで → Fomate --- */
.compare { margin: 24px auto 0; max-width: 820px; display: grid; gap: 14px; }
.compare-col { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.compare-col h3 { font-size: 15px; color: var(--muted); }
.compare-col ol { margin: 10px 0 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.compare-col li { position: relative; padding-left: 20px; font-size: 15px; color: var(--muted); }
.compare-col li::before { content: ""; position: absolute; left: 4px; top: 0.75em; width: 6px; height: 6px; border-radius: 50%; background: #d1d5db; }
.compare-after { border: 1.5px solid var(--green); background: var(--green-soft); }
.compare-after h3 { color: var(--green-deep); }
.compare-after li { color: var(--ink); font-weight: 700; }
.compare-after li::before { background: var(--green); }
@media (min-width: 700px) { .compare { grid-template-columns: 1fr 1fr; } }

.share-note { margin: 18px auto 0; max-width: 720px; text-align: center; font-size: 14px; color: var(--muted); }

/* --- 使い方: 使う人を選んで切り替える（スクリプトなし。ラジオボタンで出し分ける） --- */
.tabs { margin: 24px auto 0; max-width: 720px; }
.tabs > input { position: absolute; opacity: 0; pointer-events: none; }
.tab-labels { display: flex; gap: 6px; background: #f3f4f6; border-radius: 12px; padding: 4px; }
.tab-labels label { flex: 1 1 0; text-align: center; padding: 10px 4px; border-radius: 9px; font-size: 14px; font-weight: 700; color: var(--muted); cursor: pointer; }
.tabs .persona { display: none; margin-top: 14px; }
#usage-maker:checked ~ .tab-labels label[for="usage-maker"],
#usage-member:checked ~ .tab-labels label[for="usage-member"],
#usage-personal:checked ~ .tab-labels label[for="usage-personal"] { background: #fff; color: var(--green-deep); box-shadow: 0 1px 4px rgba(17, 24, 39, 0.12); }
#usage-maker:focus-visible ~ .tab-labels label[for="usage-maker"],
#usage-member:focus-visible ~ .tab-labels label[for="usage-member"],
#usage-personal:focus-visible ~ .tab-labels label[for="usage-personal"] { outline: 2px solid var(--green); outline-offset: 2px; }
#usage-maker:checked ~ .persona[data-persona="maker"],
#usage-member:checked ~ .persona[data-persona="member"],
#usage-personal:checked ~ .persona[data-persona="personal"] { display: block; }
.tabs .persona .persona-lead { margin-top: 0; }

/* AI の節の右: 読み取った隊形を2つ、縦に並べて見せる（左の図の2つと数を合わせる） */
.flow-image-pair img { aspect-ratio: auto; }
.flow-image-pair img + img { border-top: 1px solid var(--line); }

/* ============================================================
   動き。どれも、動きを減らす設定の端末では止める（末尾の @media）
   ============================================================ */

/* ヒーロー: 隊形が動く絵 */
.demo-motion { width: 100%; height: auto; display: block; background: var(--bg-soft); border-bottom: 1px solid var(--line); }

/* ヒーローの文字とデモを、開いたときに順に出す */
@keyframes rise-in { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.hero h1, .hero-lead, .hero .chips, .hero .buttons, .hero-note, .hero .demo { animation: rise-in 0.6s cubic-bezier(0.2, 0.7, 0.2, 1) both; }
.hero-lead { animation-delay: 0.08s; }
.hero .chips { animation-delay: 0.16s; }
.hero .buttons { animation-delay: 0.24s; }
.hero-note { animation-delay: 0.3s; }
.hero .demo { animation-delay: 0.2s; }

/* スクロールして画面に入ったら出す */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1); }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* 並んだカードは、少しずつ遅らせて出す */
.js .reveal.is-visible > .pillar, .js .reveal.is-visible > .card, .js .reveal.is-visible > .number, .js .reveal.is-visible > .compare-col { animation: rise-in 0.55s cubic-bezier(0.2, 0.7, 0.2, 1) both; }
.js .reveal.is-visible > :nth-child(2) { animation-delay: 0.08s; }
.js .reveal.is-visible > :nth-child(3) { animation-delay: 0.16s; }
.js .reveal.is-visible > :nth-child(4) { animation-delay: 0.24s; }

/* AI の節の矢印: 左から右へ流れて見せる */
@keyframes nudge { 0%, 100% { transform: translateX(-4px); opacity: 0.55; } 50% { transform: translateX(4px); opacity: 1; } }
@keyframes nudge-down { 0%, 100% { transform: rotate(90deg) translateX(-4px); opacity: 0.55; } 50% { transform: rotate(90deg) translateX(4px); opacity: 1; } }
.flow-arrow svg { animation: nudge-down 1.6s ease-in-out infinite; }
@media (min-width: 760px) { .flow-arrow svg { animation-name: nudge; } }

/* 端末の節の「つながっている」印: ゆっくり回す */
@keyframes turn { to { transform: rotate(360deg); } }
.sync svg { animation: turn 6s linear infinite; }

/* 押せるものは、触れたときに少し動かす */
.btn, .nav-start { transition: transform 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease; }
.btn:hover, .nav-start:hover { transform: translateY(-2px); box-shadow: 0 6px 14px rgba(16, 185, 129, 0.25); }
.btn:active, .nav-start:active { transform: translateY(0); box-shadow: none; }
.card, .pillar, .persona { transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease; }
.card:hover, .pillar:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(17, 24, 39, 0.08); }
.tab-labels label { transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease; }
.tabs .persona { animation: rise-in 0.3s ease both; }
.faq details[open] p { animation: rise-in 0.25s ease both; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* --- ヒーローの見本: 「アニメーション」と「お試し」を切り替える（スクリプトなし。ラジオボタンで出し分ける） --- */
.demo > input { position: absolute; opacity: 0; pointer-events: none; }
.demo-switch { display: flex; gap: 6px; background: #f3f4f6; padding: 6px; border-bottom: 1px solid var(--line); }
.demo-switch label { flex: 1 1 0; text-align: center; padding: 9px 4px; border-radius: 9px; font-size: 14px; font-weight: 700; color: var(--muted); cursor: pointer; transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease; }
#demo-mode-motion:checked ~ .demo-switch label[for="demo-mode-motion"],
#demo-mode-try:checked ~ .demo-switch label[for="demo-mode-try"] { background: #fff; color: var(--green-deep); box-shadow: 0 1px 4px rgba(17, 24, 39, 0.12); }
#demo-mode-motion:focus-visible ~ .demo-switch label[for="demo-mode-motion"],
#demo-mode-try:focus-visible ~ .demo-switch label[for="demo-mode-try"] { outline: 2px solid var(--green); outline-offset: 2px; }
.demo-pane { display: none; }
#demo-mode-motion:checked ~ .demo-pane-motion,
#demo-mode-try:checked ~ .demo-pane-try { display: block; }
.demo-pane .demo-caption { border-bottom: 0; border-top: 1px solid var(--line); }
.demo-pane-try .demo-caption { border-top: 0; border-bottom: 1px solid var(--line); }
.demo-motion { background: #fff; border-bottom: 0; padding: 8px 6px 0; }

/* AI の節の右: 縦長のステージを2つ横に並べる（左の図の2つと同じ並び）。
   元の図を重ねた画像を上に置き、ゆっくり出し入れして「読み取った位置が元の図に重なっている」ことを見せる */
.flow-image-pair { display: grid; grid-template-columns: 1fr 1fr; }
.flow-image-pair .blink { position: relative; }
.flow-image-pair .blink + .blink { border-left: 1px solid var(--line); }
.flow-image-pair img { aspect-ratio: 400 / 590; object-fit: contain; }
.flow-image-pair img + img { border-top: 0; }
.flow-image-pair .blink-top { position: absolute; inset: 0; height: 100%; animation: overlay-blink 4.5s ease-in-out infinite; }
@keyframes overlay-blink { 0%, 12% { opacity: 1; } 50%, 62% { opacity: 0; } 100% { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .flow-image-pair .blink-top { opacity: 1; } }