:root {
      --bg-deep: #050301;
      --bg-panel: rgba(10, 7, 4, 0.78);
      --bg-card: rgba(16, 11, 7, 0.72);
      --border-gold: rgba(212, 160, 72, 0.38);
      --border-gold-subtle: rgba(212, 160, 72, 0.16);
      --border-glow: rgba(255, 214, 120, 0.7);
      --gold-light: #f3d48a;
      --gold-primary: #d4a048;
      --gold-dark: #8a5e1e;
      --text-bright: #f6edd8;
      --text-muted: #b7aa94;
      --text-dim: #7a7164;
      --lapis: #2a5a9e;
      --lapis-light: #528ae8;
      --shadow-heavy: 0 28px 70px rgba(0, 0, 0, 0.78);
      --font-serif: 'Cinzel', Georgia, serif;
      --font-quote: 'Cormorant Garamond', 'Cinzel', Georgia, serif;
      --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
      --rail-left: 248px;
      --rail-right: 318px;
      --chrome-pad: 28px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      user-select: none;
      -webkit-user-drag: none;
    }
    input, textarea {
      user-select: text;
    }
    button, .nav-item, .artifact-card-item, .museum-node-card, .related-avatar, .lab-btn, .util-btn, .nav-arrow-btn, .museum-action-btn {
      font: inherit;
    }
    button:focus-visible,
    .nav-item:focus-visible,
    .artifact-card-item:focus-visible,
    .museum-node-card:focus-visible,
    .related-avatar:focus-visible,
    .lab-btn:focus-visible,
    .util-btn:focus-visible,
    .nav-arrow-btn:focus-visible,
    .museum-action-btn:focus-visible,
    input:focus-visible {
      outline: 2px solid var(--gold-light);
      outline-offset: 2px;
    }

    html, body {
      width: 100%;
      height: 100%;
      overflow: hidden;
      background-color: var(--bg-deep);
      color: var(--text-bright);
      font-family: var(--font-sans);
    }

    #webgl-container {
      position: absolute;
      inset: 0;
      z-index: 1;
    }
    #webgl-container canvas {
      touch-action: none;
      outline: none;
    }
    .vignette {
      position: absolute;
      inset: 0;
      z-index: 2;
      pointer-events: none;
      background:
        radial-gradient(ellipse at 50% 42%, transparent 28%, rgba(0, 0, 0, 0.38) 72%, rgba(0, 0, 0, 0.72) 100%),
        linear-gradient(90deg, rgba(0,0,0,0.55) 0%, transparent 18%, transparent 82%, rgba(0,0,0,0.55) 100%);
    }
    .film-grain {
      position: absolute;
      inset: 0;
      z-index: 3;
      pointer-events: none;
      opacity: 0.07;
      mix-blend-mode: overlay;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    }
    #still-stage {
      position: absolute;
      inset: 0;
      z-index: 4;
      display: flex;
      align-items: center;
      justify-content: center;
      background: radial-gradient(ellipse at 50% 45%, #1a120a 0%, #050301 70%);
      pointer-events: none;
    }
    #still-stage[hidden] { display: none; }
    #still-stage img {
      max-height: 72vh;
      max-width: min(46vw, 560px);
      object-fit: contain;
      filter: drop-shadow(0 24px 50px rgba(0,0,0,0.75));
    }
    #compare-badge {
      position: absolute;
      top: 148px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 22;
      font-family: var(--font-serif);
      font-size: 10px;
      letter-spacing: 0.22em;
      text-transform: uppercase;
      color: var(--gold-light);
      border: 1px solid var(--border-gold);
      background: rgba(12, 8, 5, 0.72);
      padding: 6px 14px;
      border-radius: 999px;
      pointer-events: none;
    }
    #compare-badge[hidden] { display: none; }

    /* Loader */
    #loading-overlay {
      position: fixed;
      inset: 0;
      z-index: 100;
      background: radial-gradient(circle at 50% 40%, #1e140b 0%, #0c0805 60%, #030201 100%);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 16px;
      transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.8s;
    }
    #loading-overlay.hidden {
      opacity: 0;
      visibility: hidden;
      pointer-events: none;
    }
    .load-title {
      font-family: var(--font-serif);
      font-size: 20px;
      letter-spacing: 0.22em;
      color: var(--gold-light);
      text-transform: uppercase;
      text-shadow: 0 0 20px rgba(229, 167, 66, 0.6);
    }
    .load-sub {
      font-size: 12px;
      color: var(--text-muted);
      letter-spacing: 0.08em;
    }
    #loading-bar-track {
      width: 280px;
      height: 3px;
      background: rgba(229, 167, 66, 0.18);
      border-radius: 2px;
      overflow: hidden;
      position: relative;
    }
    #loading-bar-fill {
      width: 0%;
      height: 100%;
      background: linear-gradient(90deg, var(--gold-dark), var(--gold-light));
      box-shadow: 0 0 12px var(--gold-light);
      transition: width 0.25s ease-out;
    }
    #loading-pct {
      font-size: 11px;
      font-family: var(--font-serif);
      letter-spacing: 0.12em;
      color: var(--gold-primary);
    }

    /* ==========================================================================
       TOP CHROME HEADER (Faithful to Mock)
       ========================================================================== */
    .top-chrome {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 64px;
      z-index: 20;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0 var(--chrome-pad);
      pointer-events: none;
      background: linear-gradient(180deg, rgba(5,3,1,0.72) 0%, transparent 100%);
    }
    .top-chrome > * {
      pointer-events: auto;
    }

    /* Brand Logo / Crest */
    .brand-crest {
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
    }
    .crest-icon {
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      filter: drop-shadow(0 0 8px rgba(229, 167, 66, 0.45));
    }
    .brand-title {
      font-family: var(--font-serif);
      font-size: 14px;
      font-weight: 700;
      letter-spacing: 0.28em;
      text-transform: uppercase;
      color: #ede2cf;
      text-shadow: 0 2px 10px rgba(0, 0, 0, 0.9);
    }

    .hero-stage-title {
      position: absolute;
      top: 58px;
      left: calc(var(--rail-left) + 36px);
      right: calc(var(--rail-right) + 36px);
      z-index: 16;
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      pointer-events: none;
    }
    .hero-stage-title > * { pointer-events: auto; }
    .hero-center-nav {
      display: flex;
      align-items: center;
      gap: 22px;
    }
    .nav-arrow-btn {
      background: none;
      border: none;
      font-family: var(--font-serif);
      font-size: 11px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--text-muted);
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: color 0.2s, text-shadow 0.2s;
    }
    .nav-arrow-btn:hover {
      color: var(--gold-light);
      text-shadow: 0 0 10px rgba(255, 214, 120, 0.45);
    }
    .hero-title-group {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 3px;
      text-align: center;
    }
    body.titles-hidden .hero-title-group { display: none; }
    .hero-eyebrow {
      font-family: var(--font-serif);
      font-size: 11px;
      letter-spacing: 0.28em;
      text-transform: uppercase;
      color: var(--gold-primary);
      font-weight: 600;
    }
    .hero-main-title {
      font-family: var(--font-serif);
      font-size: clamp(28px, 3.4vw, 46px);
      font-weight: 700;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: #f8e7b8;
      line-height: 1.05;
      text-shadow: 0 2px 18px rgba(245, 185, 75, 0.35), 0 8px 32px rgba(0, 0, 0, 0.85);
    }
    .exhibit-index {
      margin-top: 8px;
      font-size: 10px;
      letter-spacing: 0.2em;
      color: var(--text-dim);
      font-family: var(--font-serif);
    }
    .hero-scripture-pill {
      display: inline-flex;
      align-items: center;
      padding: 2px 12px;
      border-radius: 999px;
      border: 1px solid var(--border-gold);
      background: rgba(229, 167, 66, 0.12);
      font-family: var(--font-serif);
      font-size: 10px;
      letter-spacing: 0.16em;
      color: var(--gold-light);
      backdrop-filter: blur(12px);
    }

    /* Right Utilities */
    .header-utilities {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .search-box {
      display: flex;
      align-items: center;
      gap: 8px;
      background: rgba(22, 16, 11, 0.72);
      border: 1px solid rgba(229, 167, 66, 0.28);
      border-radius: 999px;
      padding: 6px 16px;
      backdrop-filter: blur(16px);
      width: 220px;
      transition: border-color 0.2s, box-shadow 0.2s, width 0.3s;
    }
    .search-box:hover, .search-box:focus-within {
      border-color: var(--border-glow);
      box-shadow: 0 0 14px rgba(229, 167, 66, 0.25);
    }
    .search-icon {
      font-size: 12px;
      color: var(--gold-primary);
      opacity: 0.85;
    }
    .search-box input {
      background: none;
      border: none;
      outline: none;
      color: var(--text-bright);
      font-size: 11px;
      font-family: var(--font-sans);
      width: 100%;
    }
    .search-box input::placeholder {
      color: var(--text-dim);
    }
    .util-btn {
      background: rgba(12, 8, 5, 0.55);
      border: 1px solid rgba(229, 167, 66, 0.22);
      color: var(--text-muted);
      border-radius: 999px;
      padding: 7px 11px;
      font-size: 13px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      backdrop-filter: blur(16px);
      transition: all 0.2s;
    }
    .util-btn.icon-only {
      width: 36px;
      height: 36px;
      padding: 0;
      justify-content: center;
    }
    .util-btn:hover {
      border-color: var(--border-glow);
      color: var(--gold-light);
      box-shadow: 0 0 12px rgba(229, 167, 66, 0.3);
    }
    .util-btn.active {
      background: rgba(229, 167, 66, 0.22);
      border-color: var(--gold-primary);
      color: var(--gold-light);
      box-shadow: 0 0 14px rgba(229, 167, 66, 0.35);
    }

    /* ==========================================================================
       LEFT NAVIGATION & ARTIFACT LIST RAIL (Faithful to Mock)
       ========================================================================== */
    .left-rail {
      position: absolute;
      top: 72px;
      left: var(--chrome-pad);
      bottom: 22px;
      width: var(--rail-left);
      z-index: 20;
      display: flex;
      flex-direction: column;
      pointer-events: none;
      padding: 8px 6px 8px 0;
    }
    .left-rail > * {
      pointer-events: auto;
    }

    /* Top Nav Links */
    .nav-rail {
      display: flex;
      flex-direction: column;
      gap: 3px;
      margin-bottom: 16px;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 9px 12px;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.2s, color 0.2s;
      color: var(--text-muted);
      font-family: var(--font-serif);
      font-size: 11px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }
    .nav-item:hover {
      color: var(--gold-light);
      background: rgba(229, 167, 66, 0.08);
    }
    .nav-item.active {
      color: #fff6e5;
      background: rgba(229, 167, 66, 0.18);
      border: 1px solid rgba(229, 167, 66, 0.35);
      box-shadow: 0 0 16px rgba(229, 167, 66, 0.15);
    }
    .nav-icon {
      font-size: 13px;
      width: 18px;
      text-align: center;
      color: var(--gold-primary);
    }

    .rail-divider {
      height: 1px;
      background: linear-gradient(90deg, rgba(229, 167, 66, 0.35), transparent);
      margin-bottom: 14px;
    }

    .rail-section-header {
      font-family: var(--font-serif);
      font-size: 10px;
      letter-spacing: 0.22em;
      color: var(--gold-primary);
      text-transform: uppercase;
      margin-bottom: 10px;
      padding-left: 4px;
      font-weight: 700;
    }
    .artifact-cards-list .rail-section-header {
      margin-top: 12px;
      margin-bottom: 6px;
      opacity: 0.85;
    }

    /* All Artifacts Cards List */
    .artifact-cards-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
      overflow-y: auto;
      padding-right: 4px;
      scrollbar-width: thin;
      scrollbar-color: rgba(229, 167, 66, 0.3) transparent;
      flex: 1;
    }
    .artifact-cards-list::-webkit-scrollbar {
      width: 4px;
    }
    .artifact-cards-list::-webkit-scrollbar-thumb {
      background: rgba(229, 167, 66, 0.3);
      border-radius: 2px;
    }

    button.artifact-card-item,
    .artifact-card-item {
      display: flex;
      align-items: center;
      color: inherit;
      width: 100%;
      text-align: left;
      gap: 12px;
      padding: 8px 10px;
      border-radius: 10px;
      background: rgba(12, 8, 5, 0.62);
      border: 1px solid rgba(229, 167, 66, 0.14);
      backdrop-filter: blur(14px);
      cursor: pointer;
      transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.2s, background 0.2s, box-shadow 0.2s;
    }
    .artifact-card-item:hover {
      background: rgba(28, 20, 14, 0.85);
      border-color: rgba(255, 215, 120, 0.5);
      transform: translateX(4px);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
    }
    .artifact-card-item.active {
      background: linear-gradient(135deg, rgba(38, 26, 16, 0.92), rgba(20, 14, 9, 0.88));
      border-color: var(--gold-primary);
      box-shadow: 0 0 18px rgba(229, 167, 66, 0.25), inset 0 0 12px rgba(229, 167, 66, 0.1);
    }
    .artifact-thumb {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: #100b07;
      border: 1px solid rgba(229, 167, 66, 0.25);
      overflow: hidden;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .artifact-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .artifact-meta {
      display: flex;
      flex-direction: column;
      gap: 2px;
      overflow: hidden;
    }
    .artifact-name {
      font-family: var(--font-serif);
      font-size: 11px;
      font-weight: 600;
      color: #fff0d4;
      white-space: normal;
      line-height: 1.25;
      letter-spacing: 0.03em;
    }
    .artifact-scripture {
      font-size: 10px;
      color: var(--gold-primary);
      opacity: 0.85;
      letter-spacing: 0.02em;
    }

    .rail-footer {
      margin-top: 14px;
    }
    .btn-back-collection {
      width: 100%;
      background: rgba(18, 13, 9, 0.75);
      border: 1px solid rgba(229, 167, 66, 0.28);
      color: var(--text-muted);
      border-radius: 8px;
      padding: 9px 12px;
      font-family: var(--font-serif);
      font-size: 10px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      cursor: pointer;
      backdrop-filter: blur(14px);
      transition: all 0.2s;
    }
    .btn-back-collection:hover {
      border-color: var(--gold-primary);
      color: var(--gold-light);
      background: rgba(229, 167, 66, 0.12);
      box-shadow: 0 0 14px rgba(229, 167, 66, 0.2);
    }

    /* ==========================================================================
       RIGHT NARRATIVE COLUMN (Faithful to Mock)
       ========================================================================== */
    .right-narrative {
      position: absolute;
      top: 72px;
      right: var(--chrome-pad);
      bottom: 22px;
      width: var(--rail-right);
      z-index: 20;
      display: flex;
      flex-direction: column;
      gap: 0;
      overflow-y: auto;
      padding: 0;
      pointer-events: none;
      scrollbar-width: thin;
      scrollbar-color: rgba(229, 167, 66, 0.3) transparent;
    }
    .right-narrative > * {
      pointer-events: auto;
    }
    .right-narrative::-webkit-scrollbar {
      width: 4px;
    }
    .right-narrative::-webkit-scrollbar-thumb {
      background: rgba(229, 167, 66, 0.3);
      border-radius: 2px;
    }

    .narrative-dossier {
      background: linear-gradient(165deg, rgba(12, 8, 5, 0.82), rgba(8, 5, 3, 0.76));
      border: 1px solid rgba(212, 160, 72, 0.32);
      border-radius: 14px;
      padding: 6px 4px;
      backdrop-filter: blur(22px);
      -webkit-backdrop-filter: blur(22px);
      box-shadow: 0 18px 48px rgba(0, 0, 0, 0.55);
      display: flex;
      flex-direction: column;
    }
    .dossier-block {
      padding: 16px 18px 18px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      border-bottom: 1px solid rgba(212, 160, 72, 0.14);
    }
    .dossier-block:last-child { border-bottom: 0; }
    .narrative-card {
      background: linear-gradient(150deg, rgba(20, 15, 10, 0.88), rgba(12, 9, 6, 0.82));
      border: 1px solid rgba(229, 167, 66, 0.3);
      border-radius: 12px;
      padding: 14px 16px;
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      box-shadow: 0 12px 32px rgba(0, 0, 0, 0.65);
      display: flex;
      flex-direction: column;
      gap: 8px;
      position: relative;
    }
    .narrative-header {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .narrative-icon {
      color: var(--gold-primary);
      font-size: 13px;
    }
    .narrative-title {
      font-family: var(--font-serif);
      font-size: 11px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--gold-light);
      font-weight: 700;
    }
    .narrative-body {
      font-size: 12px;
      line-height: 1.55;
      color: var(--text-bright);
      font-weight: 400;
    }

    /* Scripture Specific Callout */
    .scripture-quote {
      font-family: var(--font-quote);
      font-size: 18px;
      line-height: 1.45;
      font-style: italic;
      color: #fff4db;
      padding-left: 0;
      border-left: 0;
      margin: 2px 0 0;
    }
    .scripture-ref {
      font-size: 11px;
      font-family: var(--font-serif);
      letter-spacing: 0.08em;
      color: var(--gold-primary);
      text-align: right;
      font-weight: 600;
    }

    /* Historical Plate Box */
    .historical-plate-box {
      margin-top: 6px;
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid rgba(229, 167, 66, 0.35);
      box-shadow: 0 6px 18px rgba(0, 0, 0, 0.7);
      background: #090604;
    }
    .historical-plate-img {
      width: 100%;
      height: 118px;
      object-fit: cover;
      display: block;
      transition: transform 0.3s;
    }
    .historical-plate-box:hover .historical-plate-img {
      transform: scale(1.03);
    }
    .plate-caption {
      padding: 5px 8px;
      font-size: 10px;
      color: var(--gold-light);
      background: rgba(14, 10, 7, 0.92);
      font-family: var(--font-serif);
      letter-spacing: 0.08em;
      text-align: center;
      border-top: 1px solid rgba(229, 167, 66, 0.15);
    }

    /* Key Takeaway */
    .takeaway-body {
      font-family: var(--font-serif);
      font-size: 13px;
      line-height: 1.5;
      color: #ffe6b0;
      font-weight: 600;
      background: rgba(229, 167, 66, 0.08);
      padding: 8px 12px;
      border-radius: 6px;
      border: 1px solid rgba(229, 167, 66, 0.25);
    }

    /* Related Artifacts Avatars */
    .related-avatars-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 4px 6px;
      margin-top: 4px;
    }
    button.related-avatar,
    .related-avatar {
      width: 48px;
      height: 48px;
      padding: 0;
      color: inherit;
      border-radius: 50%;
      border: 1.5px solid rgba(229, 167, 66, 0.4);
      background: #140d08;
      overflow: hidden;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.6);
      transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
    }
    .related-avatar.is-locked {
      opacity: 0.42;
      position: relative;
    }
    .related-avatar.is-locked::after {
      content: "🔒";
      position: absolute;
      inset: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      background: rgba(8, 6, 3, 0.45);
    }
    .related-avatar:hover {
      transform: scale(1.15);
      border-color: var(--gold-light);
      box-shadow: 0 0 16px rgba(255, 215, 120, 0.45);
    }
    .related-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .related-dots {
      display: flex;
      justify-content: center;
      gap: 6px;
      margin-top: 6px;
    }
    .related-dots .dot {
      width: 5px;
      height: 5px;
      border-radius: 50%;
      background: rgba(229, 167, 66, 0.3);
    }
    .related-dots .dot.active {
      background: var(--gold-light);
      box-shadow: 0 0 6px var(--gold-light);
    }

    /* ==========================================================================
       BOTTOM EXHIBIT BAR (Faithful to Mock)
       ========================================================================== */
    .bottom-chrome {
      position: absolute;
      bottom: 22px;
      left: 50%;
      transform: translateX(-50%);
      z-index: 38;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      pointer-events: none;
    }
    .bottom-chrome > * {
      pointer-events: auto;
    }

    .museum-action-pill {
      display: flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(150deg, rgba(20, 15, 10, 0.88), rgba(10, 7, 5, 0.85));
      border: 1px solid rgba(229, 167, 66, 0.35);
      border-radius: 999px;
      padding: 6px 14px;
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8), 0 0 20px rgba(229, 167, 66, 0.1);
    }
    .museum-action-btn {
      background: none;
      border: none;
      font-family: var(--font-serif);
      font-size: 11px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: #ede2ce;
      padding: 8px 14px;
      border-radius: 999px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 7px;
      transition: all 0.2s;
    }
    .museum-action-btn:hover {
      color: var(--gold-light);
      background: rgba(229, 167, 66, 0.12);
    }
    .museum-action-btn.active {
      background: rgba(229, 167, 66, 0.22);
      border: 1px solid rgba(255, 215, 120, 0.5);
      color: #fff4db;
      box-shadow: 0 0 14px rgba(229, 167, 66, 0.3);
    }
    .action-icon {
      font-size: 13px;
      color: var(--gold-primary);
    }

    .stage-interaction-hint {
      font-size: 11px;
      letter-spacing: 0.08em;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 6px;
      text-shadow: 0 2px 8px rgba(0, 0, 0, 0.9);
    }
    .hint-hand {
      font-size: 12px;
      color: var(--gold-primary);
    }

    /* ==========================================================================
       UNIFIED PRECISION MUSEUM NODE SYSTEM
       ========================================================================== */
    #museum-nodes-layer {
      position: absolute;
      inset: 0;
      z-index: 12;
      pointer-events: none;
      overflow: hidden;
    }
    #museum-nodes-svg {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }

    .museum-node-line {
      stroke: rgba(229, 167, 66, 0.72);
      stroke-width: 1.2px;
      fill: none;
      stroke-linecap: round;
      stroke-linejoin: round;
      transition: stroke 0.25s, stroke-width 0.25s;
    }
    .museum-node-line-hit {
      stroke: transparent;
      stroke-width: 18px;
      fill: none;
      pointer-events: auto;
      cursor: pointer;
    }
    .museum-node-line.active {
      stroke: #ffd678;
      stroke-width: 1.8px;
      filter: drop-shadow(0 0 6px rgba(255, 214, 120, 0.8));
    }

    .museum-node-card {
      position: absolute;
      width: 196px;
      pointer-events: auto;
      cursor: pointer;
      background: rgba(10, 7, 4, 0.78);
      border: 1px solid rgba(212, 160, 72, 0.45);
      border-radius: 8px;
      padding: 12px 13px 13px;
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45);
      transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.2s, box-shadow 0.2s, opacity 0.25s;
      transform-origin: center center;
    }
    .museum-node-card:hover {
      border-color: rgba(255, 215, 120, 0.85);
      box-shadow: 0 18px 42px rgba(0, 0, 0, 0.8), 0 0 28px rgba(229, 167, 66, 0.25);
      transform: translateY(-2px);
    }
    .museum-node-card.active {
      border-color: #ffd678;
      background: linear-gradient(150deg, rgba(36, 26, 16, 0.95), rgba(18, 12, 7, 0.92));
      box-shadow: 0 20px 48px rgba(0, 0, 0, 0.85), 0 0 32px rgba(229, 167, 66, 0.35);
    }
    .museum-node-card.dim {
      opacity: 0.28;
    }
    .museum-node-card.hidden {
      opacity: 0;
      pointer-events: none;
      transform: scale(0.92);
    }

    .museum-node-header {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 6px;
    }
    .museum-node-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 22px;
      height: 22px;
      border-radius: 6px;
      background: rgba(229, 167, 66, 0.15);
      border: 1px solid rgba(229, 167, 66, 0.4);
      color: #ffd678;
      font-size: 11px;
    }
    .museum-node-label {
      font-family: var(--font-serif);
      font-size: 10.5px;
      font-weight: 700;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: #ffd678;
    }
    .museum-node-body {
      font-size: 11px;
      line-height: 1.45;
      color: #d8d0c2;
      font-weight: 400;
    }

    .museum-node-pin {
      position: absolute;
      width: 20px;
      height: 20px;
      transform: translate(-50%, -50%);
      pointer-events: auto;
      cursor: pointer;
      display: flex;
      background: none;
      border: 0;
      padding: 0;
      align-items: center;
      justify-content: center;
      z-index: 15;
    }
    .museum-node-pin-inner {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #ffd678;
      box-shadow: 0 0 10px #ffd678, 0 0 20px rgba(229, 167, 66, 0.8);
      transition: transform 0.2s, background 0.2s;
    }
    .museum-node-pin:hover .museum-node-pin-inner,
    .museum-node-pin.active .museum-node-pin-inner {
      transform: scale(1.4);
      background: #ffffff;
      box-shadow: 0 0 14px #ffffff, 0 0 24px var(--gold-light);
    }
    .museum-node-pin-halo {
      position: absolute;
      inset: 0;
      border-radius: 50%;
      border: 1.2px solid rgba(255, 214, 120, 0.65);
      animation: pinPulse 2.4s infinite ease-out;
    }
    @keyframes pinPulse {
      0% { transform: scale(0.6); opacity: 0.9; }
      70% { transform: scale(1.6); opacity: 0; }
      100% { transform: scale(1.6); opacity: 0; }
    }

    /* ==========================================================================
       STUDY LAB & TECHNICAL DRAWER
       ========================================================================== */
    .study-lab-drawer {
      position: fixed;
      top: 0;
      right: -380px;
      width: 360px;
      height: 100vh;
      background: rgba(14, 10, 6, 0.94);
      border-left: 1px solid var(--border-gold);
      backdrop-filter: blur(28px);
      -webkit-backdrop-filter: blur(28px);
      box-shadow: -16px 0 48px rgba(0, 0, 0, 0.85);
      z-index: 50;
      display: flex;
      flex-direction: column;
      transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .study-lab-drawer.open {
      right: 0;
    }
    .drawer-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 20px;
      border-bottom: 1px solid rgba(229, 167, 66, 0.2);
    }
    .drawer-title {
      font-family: var(--font-serif);
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.16em;
      color: var(--gold-light);
      text-transform: uppercase;
    }
    .drawer-close-btn {
      background: none;
      border: none;
      color: var(--text-muted);
      font-size: 16px;
      cursor: pointer;
      padding: 4px;
      transition: color 0.2s;
    }
    .drawer-close-btn:hover {
      color: var(--gold-light);
    }
    .drawer-body {
      flex: 1;
      overflow-y: auto;
      padding: 20px;
      display: flex;
      flex-direction: column;
      gap: 20px;
      scrollbar-width: thin;
      scrollbar-color: rgba(229, 167, 66, 0.3) transparent;
    }
    .drawer-section {
      display: flex;
      flex-direction: column;
      gap: 10px;
      background: rgba(24, 17, 11, 0.65);
      border: 1px solid rgba(229, 167, 66, 0.18);
      border-radius: 10px;
      padding: 12px 14px;
    }
    .section-heading {
      font-family: var(--font-serif);
      font-size: 10.5px;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--gold-primary);
      font-weight: 700;
    }
    .slider-container {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .slider-meta {
      display: flex;
      justify-content: space-between;
      font-size: 11px;
      color: var(--text-muted);
    }
    .slider-meta b {
      color: var(--gold-light);
    }
    input[type="range"] {
      width: 100%;
      accent-color: var(--gold-primary);
      height: 4px;
      border-radius: 2px;
      background: rgba(229, 167, 66, 0.2);
    }
    .button-row {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
    }
    .button-grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 6px;
    }
    .lab-btn {
      background: rgba(229, 167, 66, 0.1);
      border: 1px solid rgba(229, 167, 66, 0.3);
      color: var(--text-bright);
      font-size: 10.5px;
      padding: 7px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-family: var(--font-sans);
      transition: all 0.2s;
      text-align: center;
    }
    .lab-btn:hover {
      background: rgba(229, 167, 66, 0.22);
      border-color: var(--gold-primary);
      color: var(--gold-light);
    }
    .lab-btn.active {
      background: var(--gold-primary);
      color: #120b04;
      font-weight: 600;
      border-color: var(--gold-light);
    }
    .diag-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 6px;
    }
    .diag-cell {
      background: rgba(0, 0, 0, 0.4);
      padding: 6px 8px;
      border-radius: 6px;
      border: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      flex-direction: column;
      gap: 2px;
      font-size: 10px;
    }
    .diag-cell span {
      color: var(--text-dim);
    }
    .diag-cell b {
      color: var(--gold-light);
      font-family: monospace;
    }

    /* Museum Toast Notifications */
    #museum-toast {
      position: fixed;
      left: 50%;
      bottom: 108px;
      transform: translateX(-50%);
      z-index: 60;
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      background: rgba(16, 11, 7, 0.94);
      border: 1px solid var(--gold-primary);
      color: var(--gold-light);
      font-family: var(--font-serif);
      font-size: 11px;
      letter-spacing: 0.16em;
      padding: 10px 20px;
      border-radius: 999px;
      text-transform: uppercase;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.8), 0 0 20px rgba(229, 167, 66, 0.25);
    }
    #museum-toast.show {
      opacity: 1;
    }

    /* Overlay panels */
    .scrim {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 18;
      background: rgba(0, 0, 0, 0.55);
      border: 0;
      cursor: pointer;
    }
    body.rail-open .scrim,
    body.narrative-open .scrim,
    body.modal-open .scrim {
      display: block;
    }

    .exhibit-modal.wide { width: min(640px, calc(100vw - 32px)); }
    .exhibit-modal.cinematic {
      background: linear-gradient(160deg, rgba(16, 11, 7, 0.96), rgba(8, 5, 3, 0.94));
      padding: 28px 30px 26px;
    }
    .modal-kicker {
      font-family: var(--font-serif);
      font-size: 10px;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--gold-primary);
      margin-bottom: 8px;
    }
    .exhibit-modal {
      position: fixed;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%) scale(0.96);
      width: min(520px, calc(100vw - 32px));
      max-height: min(80vh, 640px);
      overflow-y: auto;
      z-index: 70;
      background: linear-gradient(150deg, rgba(22, 16, 11, 0.97), rgba(10, 7, 5, 0.95));
      border: 1px solid var(--border-gold);
      border-radius: 14px;
      padding: 22px 24px;
      box-shadow: var(--shadow-heavy);
      display: none;
    }
    .exhibit-modal.open {
      display: block;
      transform: translate(-50%, -50%) scale(1);
    }
    .exhibit-modal h2 {
      font-family: var(--font-serif);
      font-size: 13px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--gold-light);
      margin-bottom: 12px;
    }
    .exhibit-modal p, .timeline-item p {
      font-size: 13px;
      line-height: 1.55;
      color: var(--text-bright);
    }
    .modal-close {
      position: absolute;
      top: 12px;
      right: 12px;
      background: none;
      border: 0;
      color: var(--text-muted);
      font-size: 18px;
      cursor: pointer;
    }
    .timeline-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .timeline-item {
      border-left: 2px solid var(--gold-primary);
      padding: 4px 0 4px 12px;
      cursor: pointer;
      background: none;
      border-top: 0;
      border-right: 0;
      border-bottom: 0;
      color: inherit;
      text-align: left;
      width: 100%;
    }
    .timeline-item b {
      display: block;
      font-family: var(--font-serif);
      color: var(--gold-light);
      font-size: 12px;
      letter-spacing: 0.08em;
      margin-bottom: 4px;
    }

    .mobile-fabs {
      display: none;
      position: absolute;
      bottom: 92px;
      left: 16px;
      right: 16px;
      z-index: 22;
      justify-content: space-between;
      pointer-events: none;
    }
    .mobile-fabs button {
      pointer-events: auto;
    }

    .nav-item {
      background: none;
      border: 0;
      width: 100%;
      text-align: left;
    }
    button.museum-node-card {
      background: linear-gradient(150deg, rgba(22, 16, 11, 0.90), rgba(12, 8, 5, 0.84));
      color: inherit;
      text-align: left;
    }
    .brand-crest {
      background: none;
      border: 0;
      color: inherit;
      font: inherit;
    }

    #loading-error {
      display: none;
      max-width: 420px;
      text-align: center;
      color: #f0c27a;
      font-size: 13px;
      line-height: 1.5;
      padding: 10px 14px;
      border: 1px solid rgba(229, 167, 66, 0.4);
      border-radius: 8px;
      background: rgba(40, 16, 8, 0.7);
    }
    #loading-error.visible {
      display: block;
    }
    #btn-load-continue {
      display: none;
      margin-top: 8px;
    }
    #loading-error.visible + #btn-load-continue,
    #btn-load-continue.visible {
      display: inline-flex;
    }

    html.theme-cool {
      --bg-deep: #05070c;
      --gold-light: #c9e0ff;
      --gold-primary: #8eb4e8;
    }

    #stage-transition {
      position: fixed;
      inset: 0;
      z-index: 55;
      pointer-events: none;
      opacity: 0;
    }
    #stage-transition.active {
      opacity: 1;
    }
    .stage-fade {
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse at 50% 40%, rgba(40, 24, 8, 0.55), rgba(0, 0, 0, 0.88));
      opacity: 0;
      transition: opacity 0.18s ease;
    }
    #stage-transition.out .stage-fade,
    #stage-transition.in .stage-fade { opacity: 1; }
    .stage-glitch {
      position: absolute;
      inset: 0;
      opacity: 0;
      mix-blend-mode: screen;
      background:
        repeating-linear-gradient(0deg, transparent 0 2px, rgba(255, 210, 120, 0.08) 2px 3px),
        linear-gradient(90deg, rgba(255, 80, 40, 0.12), transparent 40%, rgba(80, 180, 255, 0.12));
    }
    #stage-transition.glitch .stage-glitch {
      opacity: 1;
      animation: glitch-jitter 0.18s steps(2) 3;
    }
    @keyframes glitch-jitter {
      0% { transform: translate(0, 0); clip-path: inset(0 0 0 0); }
      40% { transform: translate(-8px, 1px); clip-path: inset(12% 0 40% 0); }
      70% { transform: translate(7px, -2px); clip-path: inset(50% 0 10% 0); }
      100% { transform: translate(0, 0); clip-path: inset(0 0 0 0); }
    }

    .era-timeline {
      position: absolute;
      left: calc(var(--rail-left) + 24px);
      right: calc(var(--rail-right) + 24px);
      bottom: 64px;
      z-index: 18;
      height: 88px;
      overflow: hidden;
      pointer-events: none;
      mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
      -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
    }
    body.timeline-mode .era-timeline {
      height: 110px;
      bottom: 78px;
    }
    .era-track {
      display: flex;
      gap: 14px;
      width: max-content;
      pointer-events: auto;
      animation: era-flow 70s linear infinite;
    }
    @keyframes era-flow {
      from { transform: translateX(0); }
      to { transform: translateX(-50%); }
    }
    .era-cell {
      flex: 0 0 auto;
      min-width: 214px;
      max-width: 268px;
      height: auto;
      min-height: 64px;
      display: flex;
      align-items: stretch;
      gap: 0;
      padding: 0;
      border: 1px solid rgba(212, 160, 72, 0.4);
      border-radius: 8px;
      overflow: hidden;
      background: rgba(10, 7, 4, 0.78);
      color: inherit;
      cursor: pointer;
      text-align: left;
    }
    body.timeline-mode .era-cell { min-height: 110px; min-width: 220px; }
    .era-cell img {
      width: 64px;
      min-height: 64px;
      height: auto;
      object-fit: cover;
      flex-shrink: 0;
    }
    .era-cell .era-meta {
      min-width: 0;
      flex: 1 1 auto;
      padding: 8px 12px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 3px;
    }
    .era-cell b {
      font-family: var(--font-serif);
      font-size: 11px;
      letter-spacing: 0.04em;
      line-height: 1.25;
      white-space: normal;
      overflow-wrap: anywhere;
      color: var(--gold-light);
    }
    .era-cell .era-meta span {
      font-size: 10px;
      line-height: 1.25;
      white-space: normal;
      overflow-wrap: anywhere;
      color: var(--text-muted);
    }
    .era-cell:hover {
      border-color: var(--gold-light);
      box-shadow: 0 0 16px rgba(229, 167, 66, 0.28);
    }
    .era-cell.active { border-color: var(--gold-primary); }
    .era-cell.is-locked {
      opacity: 0.48;
      cursor: pointer;
      position: relative;
    }
    .era-cell.is-locked::after {
      content: "Locked";
      position: absolute;
      top: 6px;
      right: 8px;
      padding: 1px 6px;
      border-radius: 999px;
      background: rgba(12, 9, 5, 0.82);
      color: #e6c27a;
      font-size: 8px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }

    @media (prefers-reduced-motion: reduce) {
      .era-track { animation: none; }
      #stage-transition.glitch .stage-glitch { animation: none; opacity: 0; }
    }

    @media (prefers-reduced-motion: reduce) {
      .museum-node-pin-halo { animation: none; }
      * { scroll-behavior: auto; }
      #loading-overlay, .museum-node-card, .artifact-card-item, .util-btn {
        transition: none !important;
      }
    }

    @media (max-width: 1280px) {
      :root { --rail-left: 228px; --rail-right: 292px; --chrome-pad: 18px; }
      .hero-main-title { font-size: 30px; letter-spacing: 0.12em; }
    }
    @media (max-width: 1100px) {
      .search-box { width: 160px; }
      .hero-main-title { font-size: 24px; }
    }

    @media (max-width: 1024px) {
      .top-chrome {
        height: auto;
        min-height: 64px;
        flex-wrap: wrap;
        gap: 8px;
        padding: 10px 14px;
      }
      .hero-stage-title {
        left: 16px;
        right: 16px;
        top: 68px;
      }
      .hero-main-title { font-size: 22px; }
      .left-rail {
        top: 0;
        left: 0;
        bottom: 0;
        width: min(280px, 86vw);
        padding: 76px 12px 16px;
        background: rgba(10, 7, 4, 0.96);
        border-right: 1px solid var(--border-gold);
        transform: translateX(-110%);
        visibility: hidden;
        transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 40;
        pointer-events: auto;
      }
      body.rail-open .left-rail {
        transform: translateX(0);
        visibility: visible;
      }
      .right-narrative {
        top: 0;
        right: 0;
        bottom: 0;
        width: min(340px, 90vw);
        padding: 76px 12px 16px;
        background: rgba(10, 7, 4, 0.96);
        border-left: 1px solid var(--border-gold);
        transform: translateX(110%);
        visibility: hidden;
        transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 40;
        pointer-events: auto;
      }
      body.narrative-open .right-narrative {
        transform: translateX(0);
        visibility: visible;
      }
      .mobile-fabs { display: flex; }
      .search-box { display: none; }
      .museum-node-card { width: 180px; padding: 8px 10px; }
      .museum-node-body { font-size: 10.5px; }
      .bottom-chrome { width: calc(100% - 24px); }
      .museum-action-pill { flex-wrap: wrap; justify-content: center; border-radius: 18px; }
    }

    @media (max-width: 1024px) {
      .era-timeline {
        left: 12px;
        right: 12px;
        bottom: 118px;
        height: 88px;
      }
    }
    @media (max-width: 768px) {
      .brand-title { display: none; }
      .nav-arrow-btn { font-size: 10px; }
      .hero-main-title { font-size: 16px; letter-spacing: 0.08em; }
      .hero-eyebrow { font-size: 9px; }
      .header-utilities .util-btn { padding: 6px 8px; }
      #btn-open-lab span, #btn-nodes-master, #btn-titles-toggle { font-size: 11px; }
      .stage-interaction-hint { display: none; }
      .study-lab-drawer { width: min(360px, 100vw); right: -100vw; }
    }

    .museum-nodes-sheet {
      display: none !important;
    }
    @media (max-width: 480px) {
      .museum-action-btn { padding: 8px 8px; letter-spacing: 0.08em; font-size: 10px; }
      .action-icon { display: none; }
    }
    .artifact-card-item.is-locked {
      opacity: 0.46;
      cursor: pointer;
    }
    .artifact-card-item.is-locked .artifact-name::after {
      content: "Locked path";
      display: block;
      margin-top: 2px;
      font-size: 9px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: #8a7d68;
    }
    .artifact-card-item.has-sermon .artifact-name::after {
      content: "Sermon unlocked";
      display: block;
      margin-top: 2px;
      font-size: 9px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: #d4a048;
    }
    .artifact-card-item.is-locked.has-sermon .artifact-name::after {
      content: "Locked path";
    }