/* ===================================
   界面考古馆 · INTERFACE ARCHAEOLOGY
   Shared Museum Styles
   =================================== */

:root {
  --bg: #0c0c10;
  --surface: #161618;
  --surface-2: #1e1e22;
  --border: #2a2a32;
  --border-light: #3a3a44;
  --gold: #c8a96e;
  --gold-dim: #7a6540;
  --text: #e8e6e0;
  --text-dim: #888882;
  --text-faint: #444440;
  --accent-cli: #3ddc84;
  --accent-gui: #8a7aaa;
  --accent-touch: #e88060;
  --accent-llm: #60a8e8;
  --accent-none: #c8a96e;
  --radius: 6px;
  --transition: 0.2s ease;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Museum Nav (Top) ── */
.museum-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  background: rgba(12, 12, 16, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 200;
}

.museum-logo {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--gold);
  text-decoration: none;
  font-weight: 600;
  text-transform: uppercase;
}

.museum-logo span {
  color: var(--text-dim);
  margin-left: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  font-size: 0.78rem;
}

.museum-nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-era-tag {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.nav-home-link {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-decoration: none;
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

.nav-home-link:hover { color: var(--gold); }

/* ── Room Footer (Bottom Nav) ── */
.room-footer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 60px;
  background: rgba(12, 12, 16, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  z-index: 200;
}

.room-nav-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  padding: 0.45rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  background: transparent;
  cursor: pointer;
}

.room-nav-btn:hover {
  color: var(--gold);
  border-color: var(--gold-dim);
  background: rgba(200, 169, 110, 0.05);
}

.room-nav-btn.next {
  color: var(--gold);
  border-color: var(--gold-dim);
}

.room-nav-btn.next:hover {
  background: rgba(200, 169, 110, 0.1);
}

.room-counter {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--text-faint);
  text-transform: uppercase;
}

/* ── Exhibit Placard ── */
.placard {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  padding: 1.4rem 1.8rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  max-width: 360px;
}

.placard-id {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.placard-year {
  font-size: 2rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 0.4rem;
  font-variant-numeric: tabular-nums;
}

.placard-title {
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 0.8rem;
  font-weight: 500;
}

.placard-desc {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.75;
}

.placard-quote {
  font-size: 0.78rem;
  color: var(--text-faint);
  font-style: italic;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* ── Era Badge ── */
.era-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  padding: 0.28rem 0.75rem;
  border: 1px solid var(--gold-dim);
  border-radius: 20px;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }