/* === YANG FUDONG: FRAGRANT RIVER — Exhibition Styles === */
/* Aesthetic: black-and-white film, grain, darkroom, projection glow, paper manual */

:root {
  --bg-primary: #0d0d0d;
  --bg-secondary: #141414;
  --bg-card: #1a1a1a;
  --bg-elevated: #222222;
  --text-primary: #eeeeee;
  --text-secondary: #b0b0b0;
  --text-muted: #777777;
  --accent-warm: #c4b5a0;
  --accent-silver: #a8a8a8;
  --border: #333333;
  --border-light: #444444;
  --highlight: #d4c4a8;
  --shadow-glow: rgba(196, 181, 160, 0.12);
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Film grain overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 256px 256px;
}

/* Typography */
h1, h2, h3 { font-family: var(--font-serif); font-weight: 400; letter-spacing: 0.02em; }
h1 { font-size: clamp(2rem, 5vw, 3.4rem); line-height: 1.15; }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); margin-bottom: 0.6em; }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); margin-bottom: 0.4em; }
p { margin-bottom: 1em; color: var(--text-secondary); }
a { color: var(--accent-warm); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.25s; }
a:hover { border-bottom-color: var(--accent-warm); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.75rem 1.5rem; border: 1px solid var(--border-light);
  background: transparent; color: var(--text-primary); font-family: var(--font-sans);
  font-size: 0.9rem; cursor: pointer; transition: all 0.25s ease; border-radius: 2px;
  letter-spacing: 0.05em;
}
.btn:hover { background: var(--bg-elevated); border-color: var(--accent-warm); color: var(--accent-warm); }
.btn.active { background: var(--accent-warm); color: var(--bg-primary); border-color: var(--accent-warm); }
.btn-sm { padding: 0.45rem 0.9rem; font-size: 0.8rem; }

/* Layout helpers */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.2rem; }
.section { padding: 4rem 0; }
.section-alt { background: var(--bg-secondary); }

/* ========== HERO ========== */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center;
  text-align: center; overflow: hidden;
  background: radial-gradient(ellipse at 50% 40%, #1a1a1a 0%, #0d0d0d 70%);
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 60%, var(--bg-primary) 100%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2; padding: 2rem; }
.hero-subtitle {
  font-family: var(--font-serif); font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--accent-warm); letter-spacing: 0.15em; text-transform: uppercase; margin-bottom: 1rem;
}
.hero h1 { margin-bottom: 0.3em; }
.hero-en {
  font-family: var(--font-serif); font-style: italic; color: var(--text-muted);
  font-size: clamp(1rem, 2.5vw, 1.4rem); margin-bottom: 1.5rem; display: block;
}
.hero-meta {
  color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 2rem; line-height: 1.8;
}
.hero-meta span { display: inline-block; margin: 0 0.6rem; }
.hero-keywords { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem; margin-bottom: 2.5rem; }
.keyword-chip {
  border: 1px solid var(--border); padding: 0.25rem 0.6rem; font-size: 0.75rem;
  color: var(--text-muted); border-radius: 2px; letter-spacing: 0.05em;
}
.hero-cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.hero-cta .btn-primary {
  background: var(--accent-warm); color: var(--bg-primary); border-color: var(--accent-warm); font-weight: 500;
}
.hero-cta .btn-primary:hover { background: #ddd0c0; border-color: #ddd0c0; color: #000; }

/* Floating light orbs (subtle) */
.hero .orb {
  position: absolute; border-radius: 50%; filter: blur(60px); opacity: 0.18; pointer-events: none; z-index: 1;
}
.orb-1 { width: 300px; height: 300px; background: var(--accent-warm); top: 10%; left: 15%; }
.orb-2 { width: 200px; height: 200px; background: var(--accent-silver); bottom: 20%; right: 10%; }

/* ========== FLOOR PLAN ========== */
.floor-plan-wrap { display: grid; grid-template-columns: 1fr 380px; gap: 1.5rem; align-items: start; }
@media (max-width: 960px) { .floor-plan-wrap { grid-template-columns: 1fr; } }

.floor-tabs { display: flex; gap: 0.5rem; margin-bottom: 1rem; }
.floor-plan-svg {
  background: var(--bg-secondary); border: 1px solid var(--border); border-radius: 4px;
  padding: 1.5rem; position: relative; overflow: hidden;
}
.floor-plan-svg svg { width: 100%; height: auto; display: block; }
.room {
  fill: var(--bg-card); stroke: var(--border-light); stroke-width: 1.5;
  transition: fill 0.25s, stroke 0.25s; cursor: pointer;
}
.room:hover { fill: var(--bg-elevated); stroke: var(--accent-warm); }
.room.active { fill: rgba(196, 181, 160, 0.12); stroke: var(--accent-warm); stroke-width: 2; }
.room-label {
  font-family: var(--font-mono); font-size: 11px; fill: var(--text-muted); pointer-events: none;
}
.work-dot {
  fill: var(--accent-warm); stroke: var(--bg-primary); stroke-width: 2;
  cursor: pointer; transition: r 0.2s, fill 0.2s;
}
.work-dot:hover { r: 10; fill: #fff; }
.work-dot.active { r: 10; fill: var(--highlight); stroke: var(--highlight); }
.work-num {
  font-family: var(--font-mono); font-size: 10px; fill: var(--bg-primary); pointer-events: none;
  font-weight: 700; text-anchor: middle; dominant-baseline: central;
}
.corridor { fill: none; stroke: var(--border); stroke-width: 1; stroke-dasharray: 4 4; }

/* Work card panel */
.work-panel {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px;
  padding: 1.5rem; position: sticky; top: 1rem; max-height: 85vh; overflow-y: auto;
}
.work-panel.empty { color: var(--text-muted); text-align: center; padding: 3rem 1.5rem; }
.work-panel .panel-num {
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent-warm);
  border: 1px solid var(--border-light); display: inline-block; padding: 0.15rem 0.5rem; margin-bottom: 0.8rem;
}
.work-panel h3 { font-size: 1.2rem; margin-bottom: 0.3rem; }
.work-panel .panel-en { font-style: italic; color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1rem; display: block; }
.work-panel .panel-meta { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 1rem; line-height: 1.6; }
.work-panel .panel-meta strong { color: var(--text-secondary); }
.work-panel .panel-desc { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 1rem; }
.work-panel .panel-chips { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 1rem; }
.chip {
  background: var(--bg-elevated); border: 1px solid var(--border); color: var(--text-muted);
  font-size: 0.72rem; padding: 0.2rem 0.5rem; border-radius: 2px; cursor: pointer; transition: all 0.2s;
}
.chip:hover { border-color: var(--accent-warm); color: var(--accent-warm); }
.chip.active-filter { background: var(--accent-warm); color: var(--bg-primary); border-color: var(--accent-warm); }
.work-panel .panel-source { font-size: 0.72rem; color: #555; border-top: 1px solid var(--border); padding-top: 0.8rem; }

/* ========== CURATORIAL SECTIONS ========== */
.sections-scroll { display: flex; gap: 1.2rem; overflow-x: auto; padding-bottom: 1rem; scroll-snap-type: x mandatory; }
.sections-scroll::-webkit-scrollbar { height: 4px; }
.sections-scroll::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 2px; }
.section-card {
  min-width: 300px; max-width: 380px; flex: 1 1 300px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px;
  padding: 1.8rem; scroll-snap-align: start;
  transition: border-color 0.3s, transform 0.3s;
}
.section-card:hover { border-color: var(--border-light); transform: translateY(-3px); }
.section-card .sec-num {
  font-family: var(--font-mono); color: var(--accent-warm); font-size: 0.85rem; margin-bottom: 0.5rem; display: block;
}
.section-card h3 { margin-bottom: 0.6rem; }
.section-card .sec-en { font-style: italic; color: var(--text-muted); font-size: 0.85rem; margin-bottom: 1rem; display: block; }
.section-card p { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 1rem; }
.section-card .sec-keywords { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 1rem; }
.section-card .sec-works { font-size: 0.8rem; color: var(--text-muted); }
.section-card .sec-works strong { color: var(--text-secondary); }
.section-card .viewing-tip {
  margin-top: 1rem; padding: 0.8rem; background: rgba(196,181,160,0.06); border-left: 2px solid var(--accent-warm);
  font-size: 0.82rem; color: var(--text-secondary); line-height: 1.5;
}

/* ========== TIMELINE ========== */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: ""; position: absolute; left: 0.5rem; top: 0; bottom: 0; width: 1px; background: var(--border-light);
}
.timeline-item { position: relative; padding-bottom: 2rem; }
.timeline-item::before {
  content: ""; position: absolute; left: -1.55rem; top: 0.4rem; width: 8px; height: 8px;
  border-radius: 50%; background: var(--accent-warm); border: 2px solid var(--bg-primary);
}
.timeline-year { font-family: var(--font-mono); color: var(--accent-warm); font-size: 0.9rem; margin-bottom: 0.2rem; }
.timeline-title { font-weight: 500; color: var(--text-primary); margin-bottom: 0.3rem; }
.timeline-desc { font-size: 0.85rem; color: var(--text-secondary); }

/* ========== MAZE TOUR ========== */
.tour-controls { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.tour-progress { font-family: var(--font-mono); color: var(--text-muted); font-size: 0.8rem; margin-left: auto; align-self: center; }

/* ========== NOTES ========== */
.notes-area {
  width: 100%; min-height: 140px; background: var(--bg-card); border: 1px solid var(--border);
  color: var(--text-primary); font-family: var(--font-sans); font-size: 0.9rem;
  padding: 1rem; border-radius: 4px; resize: vertical; line-height: 1.6;
}
.notes-area:focus { outline: none; border-color: var(--accent-warm); }
.notes-status { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.5rem; }

/* ========== AUDIO TOGGLE ========== */
.audio-toggle {
  position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 100;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 50%;
  width: 48px; height: 48px; display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all 0.25s; font-size: 1.2rem; color: var(--text-muted);
}
.audio-toggle:hover { border-color: var(--accent-warm); color: var(--accent-warm); }
.audio-toggle.on { color: var(--accent-warm); border-color: var(--accent-warm); box-shadow: 0 0 12px var(--shadow-glow); }

/* ========== FOOTER ========== */
.site-footer { border-top: 1px solid var(--border); padding: 3rem 0 2rem; margin-top: 2rem; }
.site-footer p { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.6em; }
.site-footer a { color: var(--text-muted); border-bottom: 1px solid var(--border); }
.site-footer a:hover { color: var(--accent-warm); border-bottom-color: var(--accent-warm); }

/* ========== MEDIA STATE BADGES ========== */
.media-state-badge {
  position: absolute; top: 0.4rem; left: 0.4rem; z-index: 3;
  background: rgba(0,0,0,0.7); color: var(--accent-warm);
  font-size: 0.65rem; padding: 0.15rem 0.4rem; border-radius: 2px;
  font-family: var(--font-sans); letter-spacing: 0.05em;
}
.media-state-badge.internal { color: #ff9966; }
.media-state-badge.placeholder { color: var(--text-muted); }

.media-area[data-media-state="user"] .media-credit {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.6); color: #aaa;
  font-size: 0.7rem; padding: 0.2rem 0.5rem;
}
.media-area[data-media-state="internal"] .media-internal-notice {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.7); color: #ff9966;
  font-size: 0.65rem; padding: 0.2rem 0.5rem;
}
.media-area[data-media-state="internal"] .media-count {
  position: absolute; top: 0.3rem; right: 0.3rem;
  background: rgba(0,0,0,0.7); color: #ff9966;
  font-size: 0.65rem; padding: 0.1rem 0.4rem; border-radius: 2px;
}
.media-area[data-media-state="internal"] .media-thumb-strip {
  display: flex; gap: 0.3rem; margin-top: 0.4rem; overflow-x: auto;
}
.media-area[data-media-state="placeholder"] .media-pending-label {
  position: absolute; bottom: 0.5rem; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.7); border: 1px solid rgba(196,181,160,0.3);
  color: var(--accent-warm); font-size: 0.72rem;
  padding: 0.2rem 0.6rem; border-radius: 2px; white-space: nowrap;
}
.media-area[data-media-state="placeholder"] img {
  opacity: 0.85;
}

/* ========== WALKTHROUGH ROUTES ========== */
.walkthrough-cards {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem;
}
.walkthrough-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px;
  padding: 1.5rem; transition: all 0.3s ease;
}
.walkthrough-card:hover { border-color: var(--accent-warm); transform: translateY(-2px); }
.walkthrough-card.active { border-color: var(--accent-warm); background: rgba(196,181,160,0.06); }
.walkthrough-card .wt-time {
  font-family: var(--font-mono); color: var(--accent-warm); font-size: 0.85rem; margin-bottom: 0.4rem;
}
.walkthrough-card h3 { font-size: 1.1rem; margin-bottom: 0.4rem; }
.walkthrough-card .wt-desc { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 0.8rem; }
.walkthrough-card .wt-sequence {
  font-size: 0.75rem; color: var(--text-dim); border-top: 1px solid var(--border);
  padding-top: 0.6rem; margin-bottom: 0.8rem;
}
.walkthrough-card .wt-progress {
  font-size: 0.75rem; color: var(--accent-warm); margin-bottom: 0.5rem; min-height: 1.2em;
}
.walkthrough-controls {
  display: flex; gap: 0.4rem; flex-wrap: wrap;
}

/* ========== ON-SITE NARRATIVE ========== */
.narrative-section {
  background: var(--bg-secondary); border-left: 3px solid var(--accent-warm);
  padding: 1.5rem 2rem; border-radius: 0 4px 4px 0;
}
.narrative-section p {
  font-size: 0.9rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 1em;
}
.narrative-section .narrative-link {
  color: var(--accent-warm); font-size: 0.78rem; border-bottom: 1px dashed var(--border-light);
  cursor: pointer;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 640px) {
  .hero-keywords { gap: 0.35rem; }
  .keyword-chip { font-size: 0.65rem; padding: 0.15rem 0.4rem; }
  .floor-plan-wrap { grid-template-columns: 1fr; }
  .work-panel { position: static; max-height: none; margin-top: 1rem; }
  .section-card { min-width: 260px; padding: 1.2rem; }
  .audio-toggle { bottom: 1rem; right: 1rem; width: 44px; height: 44px; }
}

/* ========== ROUTE CARDS ========== */
.route-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.route-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px;
  padding: 1.5rem; cursor: pointer; transition: all 0.3s ease;
}
.route-card:hover { border-color: var(--accent-warm); transform: translateY(-2px); }
.route-card.active { border-color: var(--accent-warm); background: rgba(196,181,160,0.06); }
.route-card .route-num {
  font-family: var(--font-mono); color: var(--accent-warm); font-size: 1.6rem; margin-bottom: 0.5rem;
}
.route-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.route-card p { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 0.8rem; }
.route-card .route-works { font-size: 0.75rem; color: #555; border-top: 1px solid var(--border); padding-top: 0.6rem; }
.route-active-hint { text-align: center; margin-top: 1rem; font-size: 0.85rem; color: var(--accent-warm); min-height: 1.5em; }

/* ========== SPACE GRID (Fragrant River 9 Spaces) ========== */
.space-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; max-width: 600px; margin: 0 auto 1.5rem;
}
.space-node {
  aspect-ratio: 1; background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  cursor: pointer; transition: all 0.3s ease; padding: 0.5rem; text-align: center;
}
.space-node:hover { border-color: var(--accent-warm); background: rgba(196,181,160,0.06); }
.space-node.active { border-color: var(--accent-warm); box-shadow: 0 0 16px var(--shadow-glow); }
.space-node .space-id { font-family: var(--font-mono); color: var(--accent-warm); font-size: 0.75rem; margin-bottom: 0.25rem; }
.space-node .space-label { font-size: 0.78rem; color: var(--text-muted); }
.space-node .screen-count { font-size: 0.65rem; color: #555; margin-top: 0.2rem; }
.space-detail {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px;
  padding: 1.5rem; max-width: 700px; margin: 0 auto;
}
.space-detail.empty { color: var(--text-muted); text-align: center; }
.space-detail h4 { margin-bottom: 0.5rem; font-size: 1.05rem; }
.space-detail .detail-themes { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 0.8rem; }
.space-detail .detail-feeling { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 0.8rem; line-height: 1.6; }
.space-detail .detail-relation { font-size: 0.8rem; color: var(--text-muted); }

/* ========== ATMOSPHERE BAR ========== */
.atmosphere-bar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 0.5rem;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 4px; padding: 0.8rem 1.2rem;
}
.atmosphere-label { font-family: var(--font-mono); color: var(--text-muted); font-size: 0.8rem; margin-right: 0.5rem; }

/* ========== ATMOSPHERE MODES ========== */
body.mode-darkroom {
  --bg-primary: #050505;
  --bg-secondary: #080808;
  --bg-card: #0a0a0a;
  --text-primary: #bbbbbb;
  --text-secondary: #777777;
  --accent-warm: #998877;
}
body.mode-darkroom::before { opacity: 0.08; }

body.mode-booklet {
  --bg-primary: #e8e4dc;
  --bg-secondary: #ddd8ce;
  --bg-card: #f0ece4;
  --bg-elevated: #e0dbd2;
  --text-primary: #1a1a1a;
  --text-secondary: #444444;
  --text-muted: #777777;
  --accent-warm: #8b7355;
  --border: #c8c0b4;
  --border-light: #b5ad9f;
  --highlight: #7a6848;
}
body.mode-booklet::before { opacity: 0.02; }

body.mode-projector {
  --bg-primary: #0a0a12;
  --bg-secondary: #10101c;
  --bg-card: #141428;
  --accent-warm: #a0a8d0;
  --accent-silver: #8090c0;
  --highlight: #b0c0f0;
  --shadow-glow: rgba(160, 168, 208, 0.15);
}
body.mode-projector::before { opacity: 0.05; }

/* ========== MEDIA AREA IN WORK PANEL ========== */
.media-area {
  width: 100%; aspect-ratio: 16/10; background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: 4px; margin-bottom: 1rem; display: flex; align-items: center; justify-content: center;
  overflow: hidden; position: relative;
}
.media-area img { width: 100%; height: 100%; object-fit: cover; display: block; }
.media-placeholder {
  text-align: center; color: var(--text-muted); font-size: 0.82rem;
}
.media-placeholder .ph-icon { font-size: 1.8rem; display: block; margin-bottom: 0.5rem; opacity: 0.5; }
.media-placeholder .ph-text { font-size: 0.75rem; opacity: 0.6; }

/* Work panel additions */
.panel-viewing-tip {
  background: rgba(196,181,160,0.06); border-left: 2px solid var(--accent-warm);
  padding: 0.8rem; font-size: 0.82rem; color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.5;
}
.panel-related {
  font-size: 0.8rem; color: var(--text-muted); margin-bottom: 0.8rem;
}
.panel-related a { cursor: pointer; }
.panel-duration {
  font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent-warm);
  border: 1px solid var(--border-light); display: inline-block; padding: 0.15rem 0.5rem; margin-bottom: 1rem;
}

.text-center { text-align: center; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }