@import url('./tokens.css');

.chapter-shell-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.chapter-shell-title {
  font-size: var(--text-7xl);
  font-weight: 200;
  margin: var(--space-4) 0;
}

.chapter-shell-subtitle {
  font-size: var(--text-xl);
  color: var(--text-secondary);
}

.chapter-shell-hero-gradient {
  background: linear-gradient(180deg, rgba(212, 175, 55, 0.12) 0%, transparent 52%);
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 16%, transparent) 0%, transparent 52%);
}

.chapter-shell-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.concept-card {
  padding: var(--space-6);
}

.concept-card-title {
  margin-bottom: var(--space-2);
}

.concept-card-body {
  font-size: var(--text-base);
}

.relation-panel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.relation-panel-card {
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.05);
  padding: var(--space-6);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.relation-panel-card:hover {
  background: rgba(0, 0, 0, 0.7);
  border-color: var(--border-default);
}

.checkpoint-block {
  margin-top: var(--space-4);
}

.viz-control-dock {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-16);
}

.content-heading-lg {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-4);
}

.content-heading-md {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

.content-block-offset {
  margin-top: var(--space-3);
}

.concept-grid {
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.fish-period-ancient { background: var(--color-fish-ancient); }
.fish-period-christian { background: var(--color-fish-christian); }
.fish-period-medieval { background: var(--color-fish-medieval); }
.fish-period-renaissance { background: var(--color-fish-renaissance); }
.fish-period-modern { background: var(--color-fish-modern); }

.chapter-hero {
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chapter-hero-content {
  text-align: center;
  z-index: 10;
  opacity: 0;
  animation: fadeInUp 1.2s ease-out 0.5s forwards;
}

.chapter-content {
  padding: var(--space-16) 0;
}

.content-block {
  max-width: 800px;
  margin: 0 auto var(--space-16);
  opacity: 0;
  transform: translateY(40px);
}

.content-block.visible {
  animation: fadeInUp 0.8s ease-out forwards;
}

.visualization-container {
  height: 60vh;
  margin: var(--space-8) 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-glass);
  border: 1px solid var(--border-subtle);
}

.quote {
  font-size: var(--text-2xl);
  font-weight: 300;
  font-style: italic;
  color: var(--text-secondary);
  text-align: center;
  margin: var(--space-8) auto;
  max-width: 800px;
  opacity: 0.8;
}

.author {
  display: block;
  font-size: var(--text-base);
  font-style: normal;
  margin-top: var(--space-2);
  color: var(--text-tertiary);
}

/* Fish timeline visualization shared styles */
.fish-timeline-section {
  background: var(--surface-glass);
  border-radius: var(--radius-xl);
  padding: var(--space-4);
  margin: var(--space-6) 0;
  position: relative;
  overflow: hidden;
}

.fish-timeline-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-fish-ancient) 0%, var(--color-fish-medieval) 50%, var(--color-fish-modern) 100%);
  opacity: 0.6;
}

#fish-timeline-viz {
  width: 100%;
  height: 400px;
  margin: var(--space-4) 0;
  position: relative;
}

.timeline-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-top: var(--space-4);
  padding: var(--space-2);
  background: var(--surface-secondary);
  border-radius: var(--radius-md);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.legend-color {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--color-white);
}

.fish-insights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.insight-card {
  background: var(--surface-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.insight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent);
  transform: scaleY(0);
  transition: transform var(--transition-base);
}

.insight-card:hover::before {
  transform: scaleY(1);
}

@keyframes swim {
  0%, 100% { transform: translateX(0) rotate(0deg); }
  25% { transform: translateX(10px) rotate(5deg); }
  75% { transform: translateX(-10px) rotate(-5deg); }
}

.swimming-fish {
  animation: swim 4s ease-in-out infinite;
}