/* ===================================================
   silk-road.css — Silk Road Page Specific Styles
   Inherits design tokens from styles.css
   =================================================== */

/* ===== Silk Hero Overrides ===== */
.silk-hero {
  background: linear-gradient(135deg, #1a0f0a 0%, #2c1810 30%, #3d2b1f 60%, #1a3a4a 100%);
}

.silk-hero::before {
  background:
    radial-gradient(circle at 15% 60%, rgba(212,168,67,0.2) 0%, transparent 45%),
    radial-gradient(circle at 85% 40%, rgba(192,57,43,0.12) 0%, transparent 35%),
    radial-gradient(circle at 50% 20%, rgba(212,168,67,0.08) 0%, transparent 50%);
}

.hero-cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-cta-alt {
  background: transparent;
  border: 2px solid var(--color-gold);
  color: var(--color-gold);
  box-shadow: none;
}

.hero-cta-alt:hover {
  background: var(--color-gold);
  color: var(--color-ink);
  transform: translateY(-2px);
}

/* ===== Quick Nav Bar ===== */
.quick-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 56px;
  z-index: 900;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

.quick-nav-inner {
  display: flex;
  gap: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.quick-nav-inner::-webkit-scrollbar { display: none; }

.quick-nav a {
  padding: 0.9rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: all var(--transition);
}

.quick-nav a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.quick-nav a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  font-weight: 600;
}

/* ===== Section Spacing ===== */
.silk-section {
  padding: 4rem 0;
}

.silk-section + .silk-section {
  border-top: 1px solid var(--color-border);
}

/* ===== Intro Block ===== */
.intro-block {
  max-width: 860px;
  margin: 0 auto 3rem;
}

.intro-block p {
  font-size: 1.1rem;
  line-height: 1.9;
  color: var(--color-text-secondary);
}

/* ===== Route Map ===== */
.route-map-wrapper {
  margin: 2.5rem 0 3.5rem;
}

.route-map {
  position: relative;
  background: linear-gradient(135deg, #f5efe0, #ebe3d0);
  border-radius: var(--radius);
  padding: 3rem 2rem 2.5rem;
  overflow: hidden;
  min-height: 140px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
}

.route-map::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 10% 50%, rgba(192,57,43,0.06) 0%, transparent 40%),
    radial-gradient(circle at 90% 50%, rgba(212,168,67,0.08) 0%, transparent 40%);
  pointer-events: none;
}

.map-route-line {
  position: absolute;
  top: 50%;
  left: 10%;
  right: 10%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold), var(--color-accent));
  border-radius: 2px;
  transform: translateY(-50%);
}

.map-label {
  position: relative;
  z-index: 2;
  text-align: center;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-ink);
}

.map-label small {
  display: block;
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: 0.2rem;
}

.map-city {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 2;
  text-align: center;
}

.city-dot {
  display: block;
  width: 16px;
  height: 16px;
  background: var(--color-accent);
  border: 3px solid var(--color-surface);
  border-radius: 50%;
  margin: 0 auto 0.4rem;
  box-shadow: 0 0 0 3px var(--color-accent);
}

.city-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-ink);
  line-height: 1.3;
  white-space: nowrap;
}

.city-name small {
  display: block;
  font-weight: 400;
  color: var(--color-text-secondary);
  font-size: 0.7rem;
}

.map-caption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: 1rem;
  font-style: italic;
}

/* ===== Three Paths (Land / Sea / Steppe) ===== */
.three-paths {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.path-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  text-align: center;
  border-top: 4px solid var(--color-gold);
}

.path-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.path-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.path-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
}

.path-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.7;
}

/* ===== Highlight Box (Trade Asymmetry) ===== */
.highlight-box {
  background: linear-gradient(135deg, var(--color-gold-light), #f5efe0);
  border-radius: var(--radius);
  padding: 2rem 2.5rem;
  margin: 3rem 0;
  border-left: 4px solid var(--color-gold);
}

.highlight-box h4 {
  color: var(--color-accent);
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
}

.trade-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 2rem;
  align-items: start;
}

.trade-col h5 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  margin-bottom: 1rem;
  color: var(--color-ink);
}

.trade-col ul {
  list-style: none;
  padding: 0;
}

.trade-col li {
  padding: 0.4rem 0;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.trade-col li:last-child { border-bottom: none; }

.trade-divider {
  font-size: 2rem;
  color: var(--color-gold);
  align-self: center;
  font-weight: 700;
}

.trade-export h5 { color: var(--color-accent); }
.trade-import h5 { color: var(--color-ink); }

/* ===== Silk Road Timeline ===== */
.silk-timeline {
  margin-top: 3rem;
}

.silk-timeline-title {
  text-align: center;
  font-size: 1.4rem;
  margin-bottom: 2.5rem;
  color: var(--color-ink);
}

/* ===== Invention Route Blocks ===== */
.inventions-traveled-section {
  background: var(--color-surface);
}

.invention-route {
  max-width: 900px;
  margin: 0 auto 3.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--color-border);
}

.invention-route:last-of-type {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.route-header {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  margin-bottom: 1.5rem;
}

.route-emoji {
  font-size: 3rem;
  flex-shrink: 0;
  line-height: 1;
}

.route-header h3 {
  font-size: 1.4rem;
  margin-bottom: 0.3rem;
}

.route-subtitle {
  color: var(--color-gold);
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0;
}

.route-story p {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text-secondary);
}

.route-path {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--color-bg);
  border-radius: var(--radius);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.path-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  min-width: 100px;
  flex-shrink: 0;
}

.step-city {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-ink);
  margin-bottom: 0.2rem;
}

.step-date {
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 600;
}

.step-event {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  margin-top: 0.15rem;
}

.path-arrow {
  font-size: 1.3rem;
  color: var(--color-gold);
  font-weight: 700;
  flex-shrink: 0;
}

/* ===== Transmission Table ===== */
.transmission-table-wrapper {
  max-width: 900px;
  margin: 3rem auto 0;
}

.transmission-table-wrapper h3 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.transmission-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-bg);
  font-size: 0.95rem;
}

.transmission-table thead {
  background: var(--color-ink);
  color: #fff;
}

.transmission-table th {
  padding: 1rem 1.2rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
}

.transmission-table td {
  padding: 0.9rem 1.2rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.transmission-table tbody tr:hover {
  background: var(--color-gold-light);
}

.transmission-table tbody tr:last-child td {
  border-bottom: none;
}

/* ===== Culture Grid ===== */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.culture-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: all var(--transition);
  border-left: 4px solid var(--color-gold);
}

.culture-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.culture-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.culture-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.8rem;
}

.culture-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin: 0;
}

/* ===== Silk Quote ===== */
.silk-quote {
  border-left: 4px solid var(--color-gold);
  padding: 1.5rem 2rem;
  margin: 2.5rem 0;
  background: var(--color-gold-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.silk-quote p {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-style: italic;
  color: var(--color-ink);
  margin: 0;
  line-height: 1.7;
}

/* ===== Key Cities ===== */
.key-cities-section {
  background: var(--color-bg);
}

.cities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.city-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.city-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.city-header {
  padding: 2rem 2rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.city-header::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.1;
  pointer-events: none;
}

.city-changan { background: linear-gradient(135deg, #f5e6d0, #e8d4b8); }
.city-dunhuang { background: linear-gradient(135deg, #f0d5c8, #e8c4b0); }
.city-samarkand { background: linear-gradient(135deg, #d5e8f0, #b8d4e8); }
.city-baghdad { background: linear-gradient(135deg, #e8e0d0, #d4c8b0); }
.city-constantinople { background: linear-gradient(135deg, #d5d0e8, #b8b0d4); }
.city-venice { background: linear-gradient(135deg, #d0e8d5, #b0d4b8); }

.city-badge {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 0.2rem 0.8rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  letter-spacing: 0.03em;
}

.city-header h3 {
  font-size: 1.4rem;
  margin-bottom: 0.3rem;
  color: var(--color-ink);
}

.city-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin: 0;
}

.city-body {
  padding: 1.5rem 2rem 2rem;
}

.city-body p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.city-connection {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.9rem !important;
}

.city-connection strong {
  color: var(--color-accent);
}

/* ===== Legacy Section ===== */
.legacy-content {
  max-width: 900px;
  margin: 0 auto;
}

.legacy-block {
  margin-bottom: 3rem;
}

.legacy-block:last-child { margin-bottom: 0; }

.legacy-block h3 {
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.legacy-block p {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--color-text-secondary);
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
  align-items: start;
}

.comparison-item {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  box-shadow: var(--shadow);
}

.comparison-item h4 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--color-accent);
  text-align: center;
}

.comparison-item ul {
  list-style: none;
  padding: 0;
}

.comparison-item li {
  padding: 0.5rem 0;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid var(--color-border);
  line-height: 1.6;
}

.comparison-item li:last-child { border-bottom: none; }

.comparison-divider {
  font-size: 2rem;
  color: var(--color-gold);
  align-self: center;
  font-weight: 700;
}

/* ===== Responsive: Route Map ===== */
@media (max-width: 768px) {
  .route-map {
    padding: 2.5rem 1rem 2rem;
    min-height: 120px;
  }

  .city-name { font-size: 0.7rem; }
  .city-name small { display: none; }
  .map-label small { display: none; }
  .map-label { font-size: 0.8rem; }

  .trade-grid,
  .comparison-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .trade-divider,
  .comparison-divider {
    text-align: center;
    font-size: 1.5rem;
  }

  .route-path {
    padding: 1rem;
    gap: 0.3rem;
  }

  .path-step { min-width: 70px; }
  .step-city { font-size: 0.8rem; }

  .cities-grid {
    grid-template-columns: 1fr;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .three-paths {
    grid-template-columns: 1fr;
  }

  .culture-grid {
    grid-template-columns: 1fr;
  }

  .quick-nav a {
    padding: 0.7rem 0.8rem;
    font-size: 0.82rem;
  }

  .highlight-box {
    padding: 1.5rem;
  }

  .route-emoji { font-size: 2.5rem; }
  .route-header h3 { font-size: 1.2rem; }
}

/* ===== Dark Mode Adjustments ===== */
@media (prefers-color-scheme: dark) {
  .route-map {
    background: linear-gradient(135deg, #2a2520, #1f1c18);
  }

  .city-changan { background: linear-gradient(135deg, #3d2b1f, #2c1f15); }
  .city-dunhuang { background: linear-gradient(135deg, #3d2018, #2c1810); }
  .city-samarkand { background: linear-gradient(135deg, #1a2a3d, #15202c); }
  .city-baghdad { background: linear-gradient(135deg, #2c2820, #201c15); }
  .city-constantinople { background: linear-gradient(135deg, #252030, #1c1825); }
  .city-venice { background: linear-gradient(135deg, #1a2c20, #152018); }

  .transmission-table thead {
    background: #2c2820;
  }

  .comparison-item {
    background: var(--color-surface);
  }
}

/* ===== Print: hide interactive nav ===== */
@media print {
  .quick-nav { display: none; }
  .route-path { flex-wrap: wrap; }
}