/* =====================================================================
   HARU LAB — 触って試せる、動きの実験室
   デザインシステム（案B：実験室トーン）
   ===================================================================== */

:root {
  /* 背景・面 */
  --bg: #0e1116;
  --card: #171c24;
  --card-edge: #2a3140;
  --well: #11151c;

  /* テキスト */
  --ink: #e8edf4;
  --ink-sub: #8a93a3;

  /* 目的ラベル */
  --c-eye: #ffd166;    /* 目を止める */
  --c-diff: #4dd8ff;   /* 違いを伝える */
  --c-world: #a78bfa;  /* 世界観に引き込む */
  --c-touch: #4ade80;  /* 触らせる */

  --serif-en: "Space Grotesk", sans-serif;
  --mono: "JetBrains Mono", monospace;
  --sans: "Noto Sans JP", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; }

.container { width: min(1160px, 92vw); margin-inline: auto; }

/* ============================= ヘッダー ============================= */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(14,17,22,.85);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--card-edge);
}
.site-head .row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0;
}
.brand {
  font-family: var(--serif-en); font-weight: 700; letter-spacing: .14em;
  font-size: 17px; text-decoration: none;
}
.brand i { color: var(--c-eye); font-style: normal; }
.head-links { display: flex; align-items: center; gap: 18px; }
.head-links a {
  font-size: 12px; letter-spacing: .1em; color: var(--ink-sub);
  text-decoration: none; transition: color .2s;
}
.head-links a:hover { color: var(--ink); }
.head-links .to-main {
  color: #11151c; background: #e8edf4;
  padding: 8px 16px; border-radius: 999px; font-weight: 700;
  transition: opacity .2s;
}
.head-links .to-main:hover { opacity: .85; color: #11151c; }

/* ============================= MV ============================= */
.mv { position: relative; padding: clamp(64px, 11vh, 120px) 0 clamp(36px, 6vh, 64px); overflow: hidden; }
.mv canvas { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.mv .inner { position: relative; z-index: 2; }
.mv .lab-no { font-family: var(--mono); font-size: 12px; letter-spacing: .2em; color: var(--ink-sub); margin-bottom: 14px; }
.mv h1 {
  font-family: var(--serif-en); font-weight: 700;
  font-size: clamp(40px, 7vw, 76px); letter-spacing: .06em; line-height: 1.1;
}
.mv h1 i { font-style: normal; color: var(--c-eye); }
.mv .tagline { font-size: clamp(15px, 1.6vw, 19px); font-weight: 500; margin-top: 14px; }
.mv .bridge { font-family: var(--sans); font-size: clamp(12px, 1.2vw, 14px); font-weight: 500; letter-spacing: .14em; color: var(--c-eye); margin-top: 14px; }
.mv .lead { color: var(--ink-sub); font-size: clamp(13px, 1.2vw, 15px); max-width: 560px; margin-top: 18px; }
.mv .lead a { color: var(--ink); text-underline-offset: 3px; }

/* ============================= タブ（目的フィルタ） ============================= */
.tabs {
  position: sticky; top: 57px; z-index: 40;
  background: rgba(14,17,22,.85);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  padding: 14px 0;
  border-bottom: 1px solid var(--card-edge);
}
.tabs .row {
  display: flex; gap: 10px; overflow-x: auto; scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.tabs .row::-webkit-scrollbar { display: none; }
.tab {
  flex: none;
  font-size: 13px; font-weight: 500; letter-spacing: .06em;
  padding: 9px 18px; min-height: 40px;
  border-radius: 999px; cursor: pointer;
  background: transparent; color: var(--ink-sub);
  border: 1px solid var(--card-edge);
  transition: color .2s, border-color .2s, background .2s;
}
.tab:hover { color: var(--ink); border-color: var(--ink-sub); }
.tab[aria-selected="true"] { color: #11151c; font-weight: 700; }
.tab[data-cat="all"][aria-selected="true"] { background: var(--ink); border-color: var(--ink); }
.tab[data-cat="eye"][aria-selected="true"] { background: var(--c-eye); border-color: var(--c-eye); }
.tab[data-cat="diff"][aria-selected="true"] { background: var(--c-diff); border-color: var(--c-diff); }
.tab[data-cat="world"][aria-selected="true"] { background: var(--c-world); border-color: var(--c-world); }
.tab[data-cat="touch"][aria-selected="true"] { background: var(--c-touch); border-color: var(--c-touch); }

/* タブが見切れているときの「横にスクロールできる」ヒント */
.tabs { position: sticky; }
.tabs::after {
  content: "";
  position: absolute; right: 0; top: 0; bottom: 0;
  width: 64px;
  background: linear-gradient(to left, var(--bg) 35%, transparent);
  pointer-events: none;
  opacity: 1; transition: opacity .3s ease;
}
.tabs::before {
  content: "\203A";
  position: absolute; right: 10px; top: 50%;
  margin-top: -14px;
  width: 28px; height: 28px; border-radius: 50%;
  display: grid; place-items: center;
  color: var(--ink); font-size: 18px; font-weight: 700; line-height: 1;
  background: rgba(232,237,244,.12);
  border: 1px solid rgba(232,237,244,.3);
  pointer-events: none; z-index: 1;
  opacity: 1; transition: opacity .3s ease;
}
@media (prefers-reduced-motion: no-preference) {
  .tabs::before { animation: tabNudge 1.6s ease-in-out infinite; }
}
@keyframes tabNudge {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(-4px); }
}
.tabs.at-end::after, .tabs.at-end::before { opacity: 0; }

/* ============================= カードグリッド ============================= */
.grid-wrap { padding: clamp(28px, 5vh, 48px) 0 clamp(60px, 9vh, 100px); }
.grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.2vw, 26px);
}
@media (max-width: 980px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid { grid-template-columns: 1fr; } }

.card {
  display: block; text-decoration: none;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 10px;
  overflow: hidden;
  transition: transform .3s ease, border-color .3s ease, opacity .35s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--ink-sub); }
.card.is-hidden { display: none; }
.card.is-entering { opacity: 0; transform: translateY(14px); }

.card .thumb {
  position: relative; aspect-ratio: 16/10;
  background: var(--well);
  border-bottom: 1px solid var(--card-edge);
  overflow: hidden;
}
.card .body { padding: 16px 18px 18px; }
.card .exp-no { font-family: var(--mono); font-size: 11px; letter-spacing: .16em; color: var(--ink-sub); }
.card h2 { font-size: 16.5px; font-weight: 700; margin: 6px 0 8px; line-height: 1.5; }
.card .desc { font-size: 12.5px; color: var(--ink-sub); line-height: 1.8; min-height: 3.6em; }
.chip {
  display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: .08em;
  padding: 3px 10px; border-radius: 999px; margin-top: 12px;
  border: 1px solid;
}
.chip.eye { color: var(--c-eye); border-color: var(--c-eye); }
.chip.diff { color: var(--c-diff); border-color: var(--c-diff); }
.chip.world { color: var(--c-world); border-color: var(--c-world); }
.chip.touch { color: var(--c-touch); border-color: var(--c-touch); }

/* もっと見る（1ページ9枚上限） */
.grid-more { display: flex; justify-content: center; margin-top: clamp(24px, 4vh, 40px); }
.grid-more button {
  font-size: 13.5px; font-weight: 700; letter-spacing: .06em;
  padding: 13px 30px; border-radius: 999px; cursor: pointer;
  background: transparent; color: var(--ink);
  border: 1px solid var(--card-edge);
  transition: border-color .25s, background .25s;
}
.grid-more button:hover { border-color: var(--ink-sub); background: rgba(232,237,244,.05); }

/* ============================= 詳細ページ ============================= */
.detail-head { padding: clamp(44px, 8vh, 80px) 0 clamp(24px, 4vh, 40px); }
.detail-head .exp-no { font-family: var(--mono); font-size: 13px; letter-spacing: .18em; color: var(--ink-sub); }
.detail-head h1 { font-size: clamp(26px, 3.6vw, 44px); font-weight: 700; line-height: 1.3; margin: 10px 0 12px; }
.detail-head .lead { color: var(--ink-sub); font-size: clamp(13px, 1.2vw, 15px); max-width: 640px; }

.demo-stage {
  position: relative;
  background: var(--well);
  border-block: 1px solid var(--card-edge);
}
.try-note {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; letter-spacing: .08em; color: var(--ink-sub);
  margin: 14px 0 0;
}
.try-note::before { content: "👆"; }

/* 実験レポート */
.report { padding: clamp(40px, 7vh, 72px) 0; }
.report h2 {
  font-family: var(--mono); font-size: 13px; letter-spacing: .22em;
  color: var(--ink-sub); margin-bottom: 22px;
}
.report .spec { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(14px, 2vw, 24px); }
@media (max-width: 860px) { .report .spec { grid-template-columns: 1fr; } }
.spec .item {
  background: var(--card); border: 1px solid var(--card-edge); border-radius: 10px;
  padding: 20px 22px;
}
.spec .item .k { font-family: var(--mono); font-size: 11px; letter-spacing: .2em; color: var(--ink-sub); margin-bottom: 10px; }
.spec .item .v { font-size: 13.5px; line-height: 1.9; }
.report .meta-line {
  display: flex; flex-wrap: wrap; gap: 18px; margin-top: 22px;
  font-family: var(--mono); font-size: 12px; color: var(--ink-sub);
}
.report .meta-line b { color: var(--ink); font-weight: 500; }

/* 次の実験ナビ */
.next-nav { padding: 0 0 clamp(48px, 8vh, 84px); }
.next-nav .row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13.5px; font-weight: 700; letter-spacing: .06em;
  padding: 13px 26px; border-radius: 999px; text-decoration: none;
  transition: opacity .2s, transform .2s;
}
.btn:hover { opacity: .85; transform: translateY(-2px); }
.btn.primary { background: var(--ink); color: #11151c; }
.btn.ghost { border: 1px solid var(--card-edge); color: var(--ink); }

/* CTA */
.cta {
  border-top: 1px solid var(--card-edge);
  padding: clamp(44px, 8vh, 80px) 0; text-align: center;
}
.cta p { color: var(--ink-sub); font-size: 14px; margin-bottom: 20px; }
.cta .btn-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* フッター */
.foot {
  border-top: 1px solid var(--card-edge);
  padding: 30px 0 40px; text-align: center;
}
.foot .fnote { font-size: 11.5px; color: var(--ink-sub); }
.foot .fcopy { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; color: var(--ink-sub); margin-top: 10px; }

/* リビール（JSなしでも見える） */
.reveal { opacity: 1; }
html.js .reveal { opacity: 0; transform: translateY(20px); transition: opacity .7s ease, transform .7s ease; }
html.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .card, .btn { transition: none; }
}

/* ============ デモ注釈（共通部品・スマホはⓘで開閉） ============ */
.demo-note {
  position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%);
  width: max-content; max-width: 90%;
  font-size: 11.5px; letter-spacing: .08em; color: #e8edf4;
  background: rgba(10,14,20,.6); padding: 6px 14px; border-radius: 999px;
  text-align: center; pointer-events: none; z-index: 4;
}
.note-toggle { display: none; }
@media (max-width: 640px) {
  .demo-note { display: none; bottom: 56px; }
  .demo-note.is-open { display: block; }
  .note-toggle {
    display: grid; place-items: center;
    position: absolute; right: 10px; bottom: 10px; z-index: 5;
    width: 36px; height: 36px; border-radius: 50%;
    font-family: var(--mono); font-style: italic; font-weight: 700; font-size: 15px;
    color: #fff; background: rgba(10,14,20,.65);
    border: 1px solid rgba(255,255,255,.45);
    -webkit-backdrop-filter: blur(3px); backdrop-filter: blur(3px);
    cursor: pointer;
  }
  .note-toggle[aria-expanded="true"] {
    background: var(--note-accent, #e8edf4); color: #11151c; border-color: var(--note-accent, #e8edf4);
  }
}

/* スマホでだけ効く改行 */
.sp-br { display: none; }
@media (max-width: 640px) { .sp-br { display: inline; } }