/* ── TOKENS ─────────────────────────────────────────── */
    :root {
      --bg:      #02030a;
      --surface: rgba(255,255,255,0.04);
      --hover:   rgba(255,255,255,0.08);
      --border:  rgba(255,255,255,0.09);
      --text:    #f0f4ff;
      --muted:   rgba(240,244,255,0.82);   /* 二次テキスト：ニアホワイト（可読性優先） */
      --muted-dim: rgba(240,244,255,0.56); /* 意図的に控える要素（PREVIOUS UPDATED・EN トグル inactive） */
      --cyan:    #00cfff;
      --rose:    #ff6b9d;
      --violet:  #a78bfa;
      --amber:   #f59e0b;
      --modal:   rgba(2,3,10,0.96);
      --nav-h:   58px;
    }

    /* ── RESET ──────────────────────────────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Space Grotesk', sans-serif;
      background: var(--bg);
      color: var(--text);
      overflow-x: hidden;
    }
    img, video { display: block; max-width: 100%; }
    a { text-decoration: none; color: inherit; }
    button { cursor: pointer; border: none; background: none; color: inherit; }
    /* ナビ／フッターで共有する SVG スプライト定義（不可視・レイアウトに不干渉） */
    .svg-sprite { position: absolute; overflow: hidden; }

    /* ── FIXED LAYERS ───────────────────────────────────── */

    /* ── Background world ───────────────────────────────── */
    #bg-world {
      position: fixed; inset: 0; z-index: -1; pointer-events: none;
      overflow: hidden;
      /* 中心にごく僅かな深みを残しつつ、空き空間は near-black（星と天の川を際立たせる） */
      background: radial-gradient(ellipse 55% 45% at 50% 50%,
        #02030a 0%, #010206 55%, #000103 100%);
    }
    /* ── ネビュラ共通 ─────────────────────────────────── */
    .nebula {
      position: absolute; border-radius: 50%;
      pointer-events: none; will-change: transform;
    }
    /* Nebula A — シアン系、左上から呼吸 */
    .neb-a {
      width: 85vw; height: 62vh;
      top: -18%; left: -12%;
      background: radial-gradient(ellipse,
        rgba(0,185,220,0.032) 0%, transparent 68%);
      filter: blur(88px);
      animation: neb-drift-a 32s ease-in-out infinite;
    }
    /* Nebula B — ローズ系、右下 */
    .neb-b {
      width: 72vw; height: 72vh;
      bottom: -22%; right: -14%;
      background: radial-gradient(ellipse,
        rgba(210,75,120,0.026) 0%, transparent 68%);
      filter: blur(96px);
      animation: neb-drift-b 41s ease-in-out infinite;
    }
    /* Nebula C — バイオレット系、中央やや右 */
    .neb-c {
      width: 60vw; height: 58vh;
      top: 28%; left: 32%;
      background: radial-gradient(ellipse,
        rgba(120,85,215,0.021) 0%, transparent 65%);
      filter: blur(80px);
      animation: neb-drift-c 26s ease-in-out infinite;
    }
    /* Nebula D — 極薄シアン、右上 深宇宙の遠さ */
    .neb-d {
      width: 50vw; height: 45vh;
      top: -8%; right: 5%;
      background: radial-gradient(ellipse,
        rgba(0,140,190,0.016) 0%, transparent 65%);
      filter: blur(70px);
      animation: neb-drift-d 48s ease-in-out infinite;
    }

    @keyframes neb-drift-a {
      0%,100% { transform: translate(  0%,   0%) scale(1.00); }
      30%      { transform: translate(  4%,   7%) scale(1.06); }
      65%      { transform: translate( -2%,   2%) scale(0.96); }
    }
    @keyframes neb-drift-b {
      0%,100% { transform: translate(  0%,   0%) scale(1.00); }
      38%      { transform: translate( -5%,  -4%) scale(1.08); }
      72%      { transform: translate(  3%,  -1%) scale(0.94); }
    }
    @keyframes neb-drift-c {
      0%,100% { transform: translate(  0%,   0%) scale(1.00); opacity: 0.85; }
      50%      { transform: translate( -3%,   5%) scale(1.10); opacity: 1;    }
    }
    @keyframes neb-drift-d {
      0%,100% { transform: translate(  0%,   0%) scale(1.00); opacity: 0.7; }
      45%      { transform: translate( -4%,   4%) scale(1.05); opacity: 1;   }
      80%      { transform: translate(  2%,  -3%) scale(0.97); opacity: 0.8; }
    }

    @media (prefers-reduced-motion: reduce) {
      .nebula { animation: none !important; }
    }

    /* ── モバイル熱対策 ────────────────────────────────── */
    /*
     * 根本原因: position:fixed の Canvas(24fps) + backdrop-filter の組み合わせ
     * Canvas が新フレームを描くたびに backdrop-filter が再サンプリングを強制する。
     * モバイルでは backdrop-filter を全廃し、背景色で代替する。
     */
    @media (pointer: coarse) {
      /* nebula: blur(70-96px) の大面積 GPU 処理をモバイルで無効化 */
      .nebula { display: none !important; }

      /* モバイルは真っ黒背景を採用（青みの持ち上げ・色付きの霞を排除しコントラスト最大化） */
      #bg-world { background: #000 !important; }

      /* golden-glow: box-shadow 値アニメは repaint を連続発生させる
         モバイルでは静的ボーダーのみに留める */
      .panel.is-new {
        animation: none !important;
        box-shadow:
          0 0 0 1px  rgba(255, 215,  0, 0.50),
          0 0 12px   rgba(255, 200,  0, 0.40),
          0 0 24px   rgba(255, 170,  0, 0.18);
      }

      /* backdrop-filter 全廃（Canvas 再サンプリングを断つ） */
      #sticky-nav {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: rgba(2, 3, 10, 0.96) !important;
      }
      .door {
        backdrop-filter: none !important;
        background: rgba(2, 3, 10, 0.70) !important;
      }
      .v-icon {
        backdrop-filter: none !important;
        background: rgba(255, 107, 157, 0.20) !important;
      }
      #back-to-top {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
        background: rgba(2, 3, 10, 0.92) !important;
      }
    }

    #bg-canvas {
      position: fixed; inset: 0; z-index: 0; pointer-events: none;
    }
    #grain {
      position: fixed; inset: 0; z-index: 1; pointer-events: none; opacity: 0.032;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
      background-size: 300px;
    }
    /* ヴィネット — 背景の四隅を静かに沈め、映画的な奥行きと視線誘導を作る。
       canvas(0) とコンテンツ(2) の間に置き、パネルは暗くしない。負荷ゼロ（CSS のみ） */
    #bg-vignette {
      position: fixed; inset: 0; z-index: 1; pointer-events: none;
      background: radial-gradient(ellipse at center, transparent 55%, rgba(2,4,11,0.45) 100%);
    }

    /* ── STICKY NAV ─────────────────────────────────────── */
    #sticky-nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      height: var(--nav-h);
      display: grid; grid-template-columns: 1fr auto 1fr;
      align-items: center;
      padding: 0 3rem;
      background: rgba(2,3,10,0.82);
      backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      transform: translateY(-100%);
      transition: transform 0.4s cubic-bezier(0.16,1,0.3,1);
    }
    #sticky-nav.visible { transform: translateY(0); }
    /* PC（デスクトップ）はナビを常時表示（スクロール位置に依らず固定表示） */
    @media (min-width: 521px) { #sticky-nav { transform: translateY(0); } }

    .nav-logo {
      font-family: 'Space Mono', monospace;
      font-size: 0.8rem; letter-spacing: 0.18em;
      color: var(--text); opacity: 0.85;
      transition: opacity 0.2s;
    }

    .nav-links { display: flex; gap: 2rem; justify-content: center; }
    .nav-social { justify-self: end; }
    .nav-link {
      font-family: 'Space Mono', monospace;
      font-size: 0.65rem; letter-spacing: 0.22em;
      text-transform: none; color: var(--muted);   /* AI Art / AI Music / AI Video：原文の大小文字を保持 */
      transition: color 0.2s;
    }
    @media (hover: hover) and (pointer: fine) {
      .nav-logo:hover { opacity: 1; }
      .nav-link:hover { color: var(--text); }
    }
    .nav-link.active-gallery { color: var(--cyan); }
    .nav-link.active-films   { color: var(--rose); }
    .nav-link.active-video   { color: var(--amber); }

    /* JP / EN 言語トグル */
    .lang-toggle {
      font-family: 'Space Mono', monospace;
      font-size: 0.65rem; letter-spacing: 0.16em;
      background: none; border: none; cursor: pointer;
      color: var(--muted-dim); padding: 0 0.2rem; line-height: 1;
      display: inline-flex; align-items: center; gap: 0.3em;
    }
    .lang-toggle .lang-opt { color: var(--muted-dim); transition: color 0.2s; }
    .lang-toggle .lang-sep { opacity: 0.4; }
    .lang-toggle .lang-opt.is-active { color: var(--text); }
    @media (hover: hover) and (pointer: fine) {
      .lang-toggle:hover .lang-opt { color: var(--text); }
    }

    /* 背景のみ表示トグル（全画面/展開アイコン） */
    .bg-toggle {
      background: none; border: none; cursor: pointer; padding: 0;
      color: var(--muted); display: inline-flex; align-items: center;
      transition: color 0.2s;
    }
    .bg-toggle svg { width: 15px; height: 15px; display: block; }
    .bg-toggle .ic-collapse { display: none; }
    .bg-toggle.active { color: var(--text); }
    .bg-toggle.active .ic-expand { display: none; }
    .bg-toggle.active .ic-collapse { display: block; }
    @media (hover: hover) and (pointer: fine) {
      .bg-toggle:hover { color: var(--text); }
    }

    /* 背景のみ表示モード：ページ本文を隠し、固定背景＋ナビだけを残す */
    body.bg-only { overflow: hidden; }
    body.bg-only #sticky-nav { transform: translateY(0); }   /* 背景のみ表示中の基本＝表示（戻すボタンを保持） */
    body.bg-only.nav-hidden #sticky-nav { transform: translateY(-100%); }   /* 上方へ隠す。PC：無操作で自動（マウスで再表示）／モバイル：選択後は常に隠して没入（背景タップ→ピッカーで戻る） */
    #entrance, #gallery, #films, #videos, footer, #back-to-top { transition: opacity 0.4s ease; }
    body.bg-only #entrance, body.bg-only #gallery, body.bg-only #films,
    body.bg-only #videos, body.bg-only footer, body.bg-only #back-to-top {
      opacity: 0; visibility: hidden; pointer-events: none;
      transition: opacity 0.4s ease, visibility 0s 0.4s;
    }

    @media (max-width: 520px) {
      #sticky-nav { padding: 0 1.2rem; grid-template-columns: auto 1fr auto; }
      .nav-links { gap: 1.2rem; }
      .nav-social { gap: 0.5rem; }
    }

    /* ── ENTRANCE ───────────────────────────────────────── */
    #entrance {
      position: relative; z-index: 2;
      min-height: 100vh; min-height: 100dvh;
      display: flex; flex-direction: column;
      align-items: center; justify-content: center;
      padding: 4rem 2rem;
      text-align: center;
    }

    .ent-eye {
      font-family: 'Space Mono', monospace;
      font-size: 0.7rem; letter-spacing: 0.22em;
      color: var(--muted); text-transform: none;   /* Digital Museum：原文の大小文字を保持（mixed-case 向けに字間も調整） */
      margin-bottom: 1.2rem;
      opacity: 0; transform: translateY(14px);
    }
    .ent-title {
      font-size: clamp(4rem, 11vw, 9rem);
      font-weight: 700; letter-spacing: -0.04em; line-height: 0.88;
      /* ブランドカラー（cyan→violet 系）でトーナルに統一。
         元の緑は他要素と乖離していたため、深シアン→淡バイオレット の流れに変更。 */
      background: linear-gradient(
        128deg,
        #003d5b  0%,
        #0077a3 18%,
        #00cfff 36%,
        #5edfff 55%,
        #a78bfa 72%,
        #c4b5fd 86%,
        #ddd6fe 100%
      );
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      background-clip: text;
      opacity: 0; transform: translateY(22px);
    }
    .ent-sub {
      margin-top: 1.8rem; font-size: 1rem;
      color: var(--muted); font-weight: 300; letter-spacing: 0.05em;
      opacity: 0; transform: translateY(14px);
    }
    .ent-rule {
      width: min(480px, 90vw); height: 1px; margin: 3rem auto 0;
      background: linear-gradient(90deg, transparent, var(--cyan), var(--rose), var(--violet), transparent);
      opacity: 0; transform: scaleX(0);
    }

    /* Door cards */
    .ent-doors {
      display: flex; flex-wrap: wrap; justify-content: center;
      gap: 1.5rem; margin-top: 3.5rem;
      opacity: 0; transform: translateY(20px);
    }
    .door {
      width: 220px; padding: 2rem 1.5rem;
      border-radius: 14px;                /* カード級の角丸を .panel と統一 */
      border: 1px solid var(--border);    /* ヘアラインをトークンに統一 */
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(8px);
      display: flex; flex-direction: column; align-items: center; gap: 0.75rem;
      transition: transform 0.35s ease, background 0.35s, border-color 0.35s;
      cursor: pointer;
    }
    .door-gallery { border-color: rgba(0,207,255,0.18); }
    .door-films   { border-color: rgba(255,107,157,0.18); }
    .door-videos  { border-color: rgba(245,158,11,0.18); }

    @media (hover: hover) and (pointer: fine) {
      .door:hover { transform: translateY(-6px); }
      .door-gallery:hover { background: rgba(0,207,255,0.07);   border-color: rgba(0,207,255,0.45);   box-shadow: 0 8px 32px rgba(0,207,255,0.1); }
      .door-films:hover   { background: rgba(255,107,157,0.07); border-color: rgba(255,107,157,0.45); box-shadow: 0 8px 32px rgba(255,107,157,0.1); }
      .door-videos:hover  { background: rgba(245,158,11,0.07);  border-color: rgba(245,158,11,0.45);  box-shadow: 0 8px 32px rgba(245,158,11,0.1); }
    }

    .door-icon {
      width: 44px; height: 44px; border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
    }
    .door-gallery .door-icon { background: rgba(0,207,255,0.12); }
    .door-films   .door-icon { background: rgba(255,107,157,0.12); }
    .door-videos  .door-icon { background: rgba(245,158,11,0.12); }
    .door-icon svg { width: 20px; height: 20px; }
    .door-gallery .door-icon svg { stroke: var(--cyan); }
    .door-films   .door-icon svg { stroke: var(--rose); }
    .door-videos  .door-icon svg { stroke: var(--amber); }

    .door-label {
      font-family: 'Space Mono', monospace;
      font-size: 0.7rem; letter-spacing: 0.22em;
      text-transform: none;   /* door-label：AI Art / AI Scene 等を mixed-case で表示 */
    }
    .door-gallery .door-label { color: var(--cyan); }
    .door-films   .door-label { color: var(--rose); }
    .door-videos  .door-label { color: var(--amber); }

    .door-count {
      font-size: 0.8rem; color: var(--muted); font-weight: 300;
    }

    /* AI Scene door（violet・背景選択を開く）＋ button リセット */
    button.door { font: inherit; color: inherit; text-align: center; -webkit-appearance: none; appearance: none; }
    .door-scene { border-color: rgba(167,139,250,0.18); }
    .door-scene .door-icon { background: rgba(167,139,250,0.12); }
    .door-scene .door-icon svg { stroke: var(--violet); }
    .door-scene .door-label { color: var(--violet); }
    @media (hover: hover) and (pointer: fine) {
      .door-scene:hover { background: rgba(167,139,250,0.07); border-color: rgba(167,139,250,0.45); box-shadow: 0 8px 32px rgba(167,139,250,0.1); }
    }

    /* Scroll hint */
    .scroll-hint {
      position: absolute; bottom: 2.5rem; left: 50%; transform: translateX(-50%);
      display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
      font-family: 'Space Mono', monospace;
      font-size: 0.6rem; letter-spacing: 0.3em; color: var(--muted);   /* 最小段 0.6rem（9.6px）— 9px 下限の遵守 */
      opacity: 0;
    }
    .scroll-hint::after {
      content: ''; width: 1px; height: 36px;
      background: linear-gradient(to bottom, var(--muted), transparent);
      animation: scroll-line 1.8s ease-in-out infinite;
    }
    @keyframes scroll-line {
      0%   { transform: scaleY(0); transform-origin: top; opacity: 0; }
      40%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
      100% { transform: scaleY(0); transform-origin: bottom; opacity: 0; }
    }

    @media (max-width: 520px) {
      .ent-doors { flex-direction: column; align-items: center; gap: 1rem; }
      .door { width: min(240px, 80vw); padding: 1.5rem; }
      .scroll-hint { display: none; }
    }

    /* ── SECTION SHARED ─────────────────────────────────── */
    .section-outer {
      position: relative; z-index: 2;
      scroll-margin-top: var(--nav-h);
    }
    .section-wrap {
      max-width: 1400px; margin: 0 auto;
      padding: 6rem 3rem 8rem;
    }
    .section-head {
      /* h2 の真上に余白を足し、背景キャンバスのアートを覗かせる（PC〜モバイルで滑らかに） */
      padding-top: clamp(3.5rem, 7vw, 6rem);
      margin-bottom: 3rem;
      display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap;
    }
    .sec-eye {
      font-family: 'Space Mono', monospace;
      font-size: 0.65rem; letter-spacing: 0.22em;
      text-transform: none;   /* sec-eye：mixed-case 化＋字間を 0.4em→0.22em に調整 */
    }
    .sec-eye-gallery { color: var(--cyan); }
    .sec-eye-films   { color: var(--rose); }
    .sec-eye-video   { color: var(--amber); }

    .sec-title {
      font-size: clamp(1.6rem, 4vw, 2.8rem);
      font-weight: 700; letter-spacing: -0.03em; line-height: 1;
    }
    .sec-count {
      font-family: 'Space Mono', monospace;
      font-size: 0.65rem; color: var(--muted); letter-spacing: 0.1em;
      margin-left: auto;
    }

    .section-rule {
      height: 1px; margin-bottom: 2rem;
      background: linear-gradient(90deg, currentColor, transparent);
      opacity: 0.18;
    }
    #gallery .section-rule { color: var(--cyan); }
    #films   .section-rule { color: var(--rose); }
    #videos  .section-rule { color: var(--amber); }

    @media (max-width: 520px) {
      .section-wrap { padding: 4rem 1.4rem 5rem; }
    }

    /* ── SERIES BLOCK (films) ───────────────────────────── */
    .series-block { margin-bottom: 4rem; }
    .series-block:last-child { margin-bottom: 0; }

    .series-label {
      font-family: 'Space Mono', monospace;
      font-size: 0.6rem; font-weight: 400; letter-spacing: 0.35em;
      text-transform: uppercase; color: rgba(255,107,157,0.5);
      margin-bottom: 1.2rem;
      display: flex; align-items: center; gap: 1rem;
    }
    .series-label::after {
      content: ''; flex: 1; height: 1px;
      background: linear-gradient(90deg, rgba(255,107,157,0.15), transparent);
    }

    /* ── GRID ───────────────────────────────────────────── */
    .grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      grid-auto-rows: 280px;
      gap: 1.5rem;
    }
    @media (max-width: 1100px) {
      .grid { grid-template-columns: repeat(3, 1fr); grid-auto-rows: 250px; gap: 1rem; }
    }
    @media (max-width: 780px) {
      .grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 210px; gap: 1rem; }
    }
    @media (max-width: 480px) {
      .grid { grid-template-columns: 1fr; grid-auto-rows: 200px; gap: 0.75rem; }
      .panel.large, .panel.tall, .panel.wide { grid-column: span 1; grid-row: span 1; }
      #videos-grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: auto; }
      #videos-grid .panel { aspect-ratio: 1; }
    }

    /* ── ANIMALS GRID (2-col landscape) ─────────────────── */
    #animals-grid {
      grid-template-columns: repeat(2, 1fr);
      grid-auto-rows: auto;
    }
    #animals-grid .panel {
      aspect-ratio: 16 / 9;
    }
    #animals-grid .panel.wide {
      grid-column: span 1; /* 2カラムグリッド内では span しない */
    }
    @media (max-width: 480px) {
      #animals-grid { grid-template-columns: 1fr; }
    }

    /* ── PANEL ──────────────────────────────────────────── */
    .panel {
      position: relative;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 14px; overflow: hidden;
      cursor: pointer; outline: none;
      transition: border-color 0.35s, background 0.35s;
    }
    .panel:focus-visible { outline: 2px solid rgba(255,255,255,0.35); outline-offset: 3px; }
    /* キーボード操作の焦点表示 — パネルと同じ様式を全インタラクティブ要素へ（マウス操作時は不可視） */
    a:focus-visible, button:focus-visible {
      outline: 2px solid rgba(255,255,255,0.35); outline-offset: 3px;
    }

    .panel.large { grid-column: span 2; grid-row: span 2; }
    .panel.tall  { grid-row: span 2; }
    .panel.wide  { grid-column: span 2; }

    /* glow on hover */
    .panel::after {
      content: ''; position: absolute; inset: 0; border-radius: 14px;
      opacity: 0; pointer-events: none; transition: opacity 0.4s;
    }
    .panel[data-type="image"]::after   { box-shadow: inset 0 0 40px rgba(0,207,255,0.15); }
    .panel[data-type="video"]::after   { box-shadow: inset 0 0 40px rgba(255,107,157,0.15); }
    .panel[data-type="aivideo"]::after { box-shadow: inset 0 0 40px rgba(245,158,11,0.15); }

    /* image thumbnail */
    .panel-thumb {
      width: 100%; height: 100%; object-fit: cover;
      transition: transform 0.65s cubic-bezier(0.25,0.46,0.45,0.94);
    }

    /* video layers */
    .panel-vid-bg  { position: absolute; inset: 0; }
    .panel-vid-frame {
      position: absolute; inset: 0;
      width: 100%; height: 100%; object-fit: cover;
      opacity: 0; transition: opacity 0.7s ease, transform 0.65s cubic-bezier(0.25,0.46,0.45,0.94);
      z-index: 1; pointer-events: none;
    }
    .v-icon-wrap {
      position: absolute; inset: 0; z-index: 2;
      display: flex; align-items: center; justify-content: center;
    }
    .v-icon {
      width: 52px; height: 52px; border-radius: 50%;
      background: rgba(255,107,157,0.15);
      border: 1.5px solid rgba(255,107,157,0.4);
      display: flex; align-items: center; justify-content: center;
      transition: background 0.3s, transform 0.3s;
      backdrop-filter: blur(4px);
    }
    .v-icon svg { width: 18px; height: 18px; fill: var(--rose); margin-left: 3px; }

    /* aivideo — play icon uses amber */
    .panel[data-type="aivideo"] .v-icon {
      background: rgba(245,158,11,0.15);
      border-color: rgba(245,158,11,0.4);
    }
    .panel[data-type="aivideo"] .v-icon svg { fill: var(--amber); }

    /* info bar */
    .panel-info {
      position: absolute; bottom: 0; left: 0; right: 0; z-index: 3;
      padding: 1.2rem;
      background: linear-gradient(to top, rgba(2,3,10,0.93), transparent);
      transform: translateY(5px); transition: transform 0.3s;
    }

    /* ── HOVER（マウス／トラックパッドのみ） ──
       タッチデバイスでは hover が sticky になる問題を避けるため隔離 */
    @media (hover: hover) and (pointer: fine) {
      .panel:hover::after                 { opacity: 1; }
      .panel[data-type="image"]:hover     { border-color: rgba(0,207,255,0.3); }
      .panel[data-type="video"]:hover     { border-color: rgba(255,107,157,0.3); }
      .panel[data-type="aivideo"]:hover   { border-color: rgba(245,158,11,0.3); }
      .panel:hover .panel-thumb           { transform: scale(1.05); }
      .panel:hover .panel-vid-frame       { transform: scale(1.05); }
      .panel:hover .v-icon                { background: rgba(255,107,157,0.3); transform: scale(1.1); }
      .panel[data-type="aivideo"]:hover .v-icon { background: rgba(245,158,11,0.3); }
      .panel:hover .panel-info            { transform: translateY(0); }
    }
    .panel-tag {
      font-family: 'Space Mono', monospace;
      font-size: 0.6rem; letter-spacing: 0.22em;
      text-transform: none; margin-bottom: 0.3rem;   /* Vol.N を「Vol.3」表記に（IMAGE/VIDEO/MUSIC はデータ側が大文字） */
    }
    .panel[data-type="image"]   .panel-tag { color: var(--cyan); }
    .panel[data-type="video"]   .panel-tag { color: var(--rose); }
    .panel[data-type="aivideo"] .panel-tag { color: var(--amber); }
    .panel-title {
      font-size: 0.9rem; font-weight: 600;
      white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
      max-width: 100%;
    }

    /* ── MODAL ──────────────────────────────────────────── */
    .modal-overlay {
      position: fixed; inset: 0; z-index: 200;
      background: var(--modal);
      backdrop-filter: blur(22px); -webkit-backdrop-filter: blur(22px);
      display: flex; align-items: center; justify-content: center;
      padding: 2rem;
      opacity: 0; pointer-events: none;
      transition: opacity 0.3s ease;
    }
    .modal-overlay.open { pointer-events: all; opacity: 1; }

    .modal-close {
      position: absolute; top: 1.75rem; right: 1.75rem; z-index: 10;
      width: 42px; height: 42px; border-radius: 50%;
      border: 1px solid var(--border); background: var(--surface);
      font-size: 1.2rem; display: flex; align-items: center; justify-content: center;
      transition: background 0.2s;
    }
    @media (hover: hover) and (pointer: fine) {
      .modal-close:hover { background: var(--hover); }
    }

    .modal-box {
      width: 100%; max-width: 900px; max-height: 90vh; overflow-y: auto;
      opacity: 0; transform: scale(0.93) translateY(24px);
      transition: opacity 0.35s ease, transform 0.4s ease;
      scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.1) transparent;
    }
    .modal-overlay.open .modal-box { opacity: 1; transform: none; }
    .modal-box::-webkit-scrollbar { width: 3px; }
    .modal-box::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

    .modal-img   { width: 100%; border-radius: 10px; object-fit: contain; max-height: 68vh; }
    .modal-video { display: block; margin: 0 auto; width: 100%; border-radius: 10px; max-height: 68vh; background: #000; object-fit: contain; }

    .modal-meta  { margin-top: 1.6rem; padding: 0 0.5rem 2.5rem; }
    .modal-tag   {
      font-family: 'Space Mono', monospace;
      font-size: 0.65rem; letter-spacing: 0.28em;
      text-transform: none; margin-bottom: 0.7rem;   /* モーダルのタグも mixed-case 許容（データ側の大文字はそのまま） */
    }
    .modal-h {
      font-size: clamp(1.3rem, 3.5vw, 2rem);
      font-weight: 700; letter-spacing: -0.02em;
      margin-bottom: 0.85rem; line-height: 1.22;
    }
    .modal-desc { color: rgba(240,244,255,0.85); font-size: 1rem; line-height: 1.88; font-weight: 300; }

    /* ── AI Scene : background picker ─────────────────── */
    .sp-overlay {
      position: fixed; inset: 0; z-index: 150;
      display: flex; align-items: center; justify-content: center;
      padding: 2rem;
      background: rgba(4,6,15,0.45);
      opacity: 0; pointer-events: none;
      transition: opacity 0.32s ease;
    }
    .sp-overlay.open { opacity: 1; pointer-events: auto; }
    .sp-panel {
      position: relative;
      width: min(560px, 94vw); max-height: 86vh; overflow-y: auto;
      padding: 2.4rem 2rem 2rem;
      border-radius: 20px;
      border: 1px solid rgba(167,139,250,0.22);
      background: rgba(10,12,24,0.62);
      backdrop-filter: blur(18px) saturate(1.1);
      -webkit-backdrop-filter: blur(18px) saturate(1.1);
      box-shadow: 0 24px 80px rgba(0,0,0,0.5);
      transform: translateY(18px) scale(0.97); opacity: 0;
      transition: transform 0.36s cubic-bezier(.2,.8,.2,1), opacity 0.36s;
    }
    .sp-overlay.open .sp-panel { transform: none; opacity: 1; }
    .sp-close {
      position: absolute; top: 0.9rem; right: 0.9rem;
      width: 34px; height: 34px; border-radius: 50%;
      border: 1px solid var(--border); background: rgba(255,255,255,0.04);
      color: var(--muted); font-size: 0.9rem; cursor: pointer; line-height: 1;
      display: flex; align-items: center; justify-content: center;
      transition: background 0.25s, color 0.25s;
    }
    .sp-close:hover { background: rgba(255,255,255,0.1); color: #fff; }
    .sp-eye {
      font-family: 'Space Mono', monospace; font-size: 0.65rem;
      letter-spacing: 0.22em; text-transform: none; color: var(--violet);   /* sp-eye：AI Scene を mixed-case で表示 */
    }
    .sp-title { font-size: 1.5rem; font-weight: 500; margin-top: 0.3rem; letter-spacing: 0.02em; }
    .sp-sub { color: var(--muted); font-size: 0.85rem; font-weight: 300; margin-top: 0.5rem; line-height: 1.6; }
    .sp-tabs { display: flex; gap: 0.5rem; margin-top: 1.6rem; }
    .sp-tab {
      flex: 1; padding: 0.5rem 0; border-radius: 10px;
      border: 1px solid var(--border); background: rgba(255,255,255,0.03);
      color: var(--muted); font-family: 'Space Mono', monospace;
      font-size: 0.85rem; letter-spacing: 0.1em; cursor: pointer;
      transition: background 0.25s, color 0.25s, border-color 0.25s;
    }
    .sp-tab:hover { color: #fff; border-color: rgba(167,139,250,0.4); }
    .sp-tab.active { background: rgba(167,139,250,0.14); color: #fff; border-color: rgba(167,139,250,0.5); }
    .sp-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem;
      margin-top: 1.2rem; min-height: 96px;
    }
    .sp-card {
      position: relative; display: block; width: 100%; padding: 0;
      border-radius: 14px; overflow: hidden;   /* カード級の角丸を .panel と統一 */
      border: 1px solid var(--border); cursor: pointer;   /* ヘアラインをトークンに統一 */
      aspect-ratio: 16 / 9;
      transition: transform 0.3s ease, border-color 0.3s, box-shadow 0.3s;
    }
    .sp-card-name {
      position: absolute; left: 0; right: 0; bottom: 0;
      padding: 0.45rem 0.65rem;
      font-size: 0.85rem; color: #fff; text-align: left;
      background: linear-gradient(to top, rgba(0,0,0,0.62), transparent);
      text-shadow: 0 1px 4px rgba(0,0,0,0.6);
    }
    @media (hover: hover) and (pointer: fine) {
      .sp-card:hover { transform: translateY(-3px); border-color: rgba(167,139,250,0.55); box-shadow: 0 10px 30px rgba(0,0,0,0.4); }
    }
    .sp-card.selected { border-color: var(--violet); box-shadow: 0 0 0 2px rgba(167,139,250,0.5), 0 10px 30px rgba(167,139,250,0.2); }
    .sp-card.selected::after {
      content: '✓'; position: absolute; top: 6px; right: 8px;
      width: 20px; height: 20px; border-radius: 50%;
      background: var(--violet); color: #0a0a12; font-weight: 700;
      font-size: 0.7rem; display: flex; align-items: center; justify-content: center;
    }
    .sp-soon {
      grid-column: 1 / -1; text-align: center; color: var(--muted);
      font-size: 0.85rem; font-weight: 300; padding: 1.8rem 0;
      border: 1px dashed var(--border); border-radius: 14px; letter-spacing: 0.04em;
    }
    .sp-auto {
      width: 100%; margin-top: 1.4rem; padding: 0.7rem 0;
      border-radius: 10px; border: 1px solid var(--border);   /* 小型コントロール級を .sp-tab と統一 */
      background: rgba(255,255,255,0.03); color: var(--muted);
      font-family: 'Space Mono', monospace; font-size: 0.75rem; letter-spacing: 0.14em;
      cursor: pointer; transition: background 0.25s, color 0.25s, border-color 0.25s;
    }
    .sp-auto:hover { color: #fff; border-color: rgba(167,139,250,0.4); background: rgba(167,139,250,0.08); }
    .sp-auto.active { background: rgba(167,139,250,0.14); color: #fff; border-color: rgba(167,139,250,0.5); }
    @media (max-width: 520px) {
      .sp-grid { grid-template-columns: 1fr; }
      .sp-panel { padding: 2rem 1.3rem 1.6rem; }
    }


    /* ── FOOTER ─────────────────────────────────────────── */
    footer {
      position: relative; z-index: 2;
      padding: 3.5rem 3rem 2.8rem;
      border-top: 1px solid var(--border);
      font-family: 'Space Mono', monospace;
      color: var(--muted); letter-spacing: 0.12em;
    }
    .footer-inner {
      max-width: 1400px; margin: 0 auto;
      display: flex; align-items: flex-end; justify-content: space-between;
      flex-wrap: wrap; gap: 2rem;
    }
    .footer-text { display: flex; flex-direction: column; gap: 0.75rem; }
    .footer-role {
      /* 役職名は固有名詞として原文の大小文字を保持（uppercase は適用しない） */
      font-size: 0.6rem; letter-spacing: 0.28em; text-transform: none;
      color: var(--cyan); opacity: 0.75;
    }
    .footer-tagline {
      font-size: 0.65rem; line-height: 1.85; letter-spacing: 0.1em;
      color: rgba(255,255,255,0.66); font-style: italic; max-width: 52ch;   /* 可読性優先で底上げ */
    }
    .footer-credits {
      font-size: 0.6rem; letter-spacing: 0.14em;
      color: rgba(255,255,255,0.62);             /* 可読性優先で底上げ（旧 0.32） */
    }
    .footer-credits span { color: rgba(255,255,255,0.78); }
    .footer-copy {
      font-size: 0.6rem; letter-spacing: 0.18em;
      color: rgba(255,255,255,0.62); margin-top: 0.25rem;   /* 可読性優先で底上げ（旧 0.30） */
    }
    .footer-social,
    .nav-social { display: flex; align-items: center; }
    .footer-social { gap: 1rem; }
    .nav-social    { gap: 0.6rem; }

    /* Vertical divider between nav-social and nav-links */
    .nav-divider {
      display: inline-block; width: 1px; height: 16px;
      background: rgba(255,255,255,0.12); margin: 0 0.9rem;
    }

    /* ── Base icon button ───────────────────────────── */
    .social-link {
      position: relative;
      display: flex; align-items: center; justify-content: center;
      border-radius: 50%; border: 1px solid transparent;
      background: rgba(255,255,255,0.03);
      transition: background 0.3s, border-color 0.3s, transform 0.3s;
      animation: social-beat 3s ease-in-out infinite;
    }
    .footer-social .social-link { width: 38px; height: 38px; }
    .nav-social    .social-link { width: 28px; height: 28px; }
    .social-link svg { display: block; }
    /* タップ領域の拡張 — 44px 未満の円形コントロールを 44px 相当に（見た目は不変） */
    .social-link::after, .sp-close::after, .modal-close::after {
      content: ''; position: absolute; left: 50%; top: 50%;
      width: 44px; height: 44px; transform: translate(-50%, -50%);
      border-radius: 50%;
    }
    .footer-social .social-link svg { width: 16px; height: 16px; }
    .nav-social    .social-link svg { width: 12px; height: 12px; }

    /* Staggered heartbeat delay */
    .social-link:nth-child(2) { animation-delay: 1s; }
    .social-link:nth-child(3) { animation-delay: 2s; }

    @keyframes social-beat {
      0%,100% { transform: scale(1);    box-shadow: 0 0  0px 0px transparent; }
      50%      { transform: scale(1.11); box-shadow: 0 0 10px 2px currentColor; }
    }

    /* ── X ── */
    .social-link.x-link { border-color: rgba(255,255,255,0.18); color: rgba(255,255,255,0.4); }
    .social-link.x-link svg { fill: #ffffff; }

    /* ── Instagram ── */
    .social-link.ig-link { border-color: rgba(214,41,118,0.28); color: rgba(214,41,118,0.35); }

    /* ── note ── */
    .social-link.note-link { border-color: rgba(65,201,180,0.28); color: rgba(65,201,180,0.35); }
    .social-link.note-link svg { fill: #41c9b4; }

    @media (hover: hover) and (pointer: fine) {
      .social-link:hover {
        animation-play-state: paused;
        transform: scale(1.18) translateY(-2px);
      }
      .social-link.x-link:hover    { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.45); }
      .social-link.ig-link:hover   { background: rgba(214,41,118,0.1);  border-color: rgba(214,41,118,0.55); }
      .social-link.note-link:hover { background: rgba(65,201,180,0.1);  border-color: rgba(65,201,180,0.55); }
    }

    @media (max-width: 520px) {
      footer { padding: 2rem 1.5rem; }
      .footer-inner { justify-content: center; }
      .footer-text { text-align: left; align-items: flex-start; }
      .footer-social { justify-content: center; width: 100%; }
      .nav-social, .nav-divider { display: none; }
    }

    /* ── NEW BADGE ──────────────────────────────────────── */
    .panel-new-dot {
      position: absolute; top: 0.75rem; right: 0.75rem; z-index: 4;
      width: 7px; height: 7px; border-radius: 50%;
      pointer-events: none;
      animation: new-pulse 2.4s ease-in-out infinite;
    }
    .panel[data-type="image"]   .panel-new-dot { background: var(--cyan);  box-shadow: 0 0 6px 2px rgba(0,207,255,0.55); }
    .panel[data-type="video"]   .panel-new-dot { background: var(--rose);  box-shadow: 0 0 6px 2px rgba(255,107,157,0.55); }
    .panel[data-type="aivideo"] .panel-new-dot { background: var(--amber); box-shadow: 0 0 6px 2px rgba(245,158,11,0.55); }
    @keyframes new-pulse {
      0%, 100% { opacity: 1;   transform: scale(1); }
      50%       { opacity: 0.5; transform: scale(0.72); }
    }

    /* ── GOLDEN FRAME（新着パネルの黄金輝きフレーム） ──────── */
    .panel.is-new {
      border-color: rgba(255, 210, 60, 0.75);
      animation: golden-glow 2.8s ease-in-out infinite;
    }
    @keyframes golden-glow {
      0%, 100% {
        box-shadow:
          0 0 0 1px  rgba(255, 215,  0, 0.45),
          0 0 10px   rgba(255, 200,  0, 0.45),
          0 0 22px   rgba(255, 170,  0, 0.22);
      }
      50% {
        box-shadow:
          0 0 0 2px  rgba(255, 225, 60, 0.80),
          0 0 18px   rgba(255, 210,  0, 0.75),
          0 0 38px   rgba(255, 175,  0, 0.45),
          0 0 58px   rgba(255, 140,  0, 0.18);
      }
    }

    /* ── SEC-COUNT NEW ───────────────────────────────────── */
    #gallery .sec-count-new { color: var(--cyan); }
    #films   .sec-count-new { color: var(--rose); }
    #videos  .sec-count-new { color: var(--amber); }

    /* ── ENT UPDATED ────────────────────────────────────── */
    .ent-updated {
      font-family: 'Space Mono', monospace;
      font-size: 0.6rem; letter-spacing: 0.22em;   /* 最小段 0.6rem（9.6px）— 9px 下限の遵守 */
      color: #ffffff;
      margin-top: 2.5rem;
      margin-bottom: 3rem;            /* SCROLL ヒントとの余白を確保（中央寄せの flex で視覚的に約 1.5rem 上へ持ち上がる） */
      text-align: center;
      white-space: pre-line;
      line-height: 1.7;
    }
    .ent-updated-prev { color: var(--muted-dim); }

    /* ── REDUCED MOTION ─────────────────────────────────── */
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .social-link { animation: none; }
      .panel-new-dot { animation: none; }
      .panel-thumb, .panel-vid-frame,
      .panel-info, .v-icon, .door { transition: none; }
      .scroll-hint::after { animation: none; }
    }

    /* ── SCROLLBAR ──────────────────────────────────────── */
    ::-webkit-scrollbar { width: 4px; }
    ::-webkit-scrollbar-track { background: transparent; }
    ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 2px; }


    /* ── BACK TO TOP ──────────────────────────────────── */
    #back-to-top {
      position: fixed; bottom: 2rem; right: 2rem; z-index: 100;
      width: 44px; height: 44px; border-radius: 50%;
      border: 1px solid rgba(255,255,255,0.14);
      background: rgba(2,3,10,0.82);
      backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
      display: flex; align-items: center; justify-content: center;
      color: rgba(255,255,255,0.55);
      opacity: 0; pointer-events: none;
      transition: opacity 0.35s ease, background 0.25s, transform 0.25s;
      cursor: pointer;
    }
    #back-to-top.visible { opacity: 1; pointer-events: all; }
    @media (hover: hover) and (pointer: fine) {
      #back-to-top:hover {
        background: rgba(0,207,255,0.12);
        border-color: rgba(0,207,255,0.35);
        color: var(--cyan);
        transform: translateY(-3px);
      }
    }
    #back-to-top svg { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
    @media (max-width: 520px) { #back-to-top { bottom: 1.2rem; right: 1.2rem; } }

    @media (max-width: 480px) {
      .modal-overlay { padding: 1rem; }
    }

    /* ── MOBILE PANEL OVERRIDES (must come after .panel rules) ── */
    @media (max-width: 480px) {
      .panel { border: none; }
    }