:root {
  --timeline-bg: #fff;
  --timeline-border: rgba(0, 0, 0, 0.08);
  --timeline-text: #0f172a;
  --timeline-text-muted: #4b5563;
  --timeline-divider: rgba(0, 0, 0, 0.1);
  --timeline-highlight: #ea580c;
  --timeline-ruler-text: #6b7280;
}

.theme-dark {
  --timeline-bg: #030712;
  --timeline-border: rgba(255, 255, 255, 0.05);
  --timeline-text: #f3f4f6;
  --timeline-text-muted: #9ca3af;
  --timeline-divider: rgba(255, 255, 255, 0.1);
  --timeline-highlight: #fb923c;
  --timeline-ruler-text: #9ca3af;
}

.timeline-root {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 3rem;
  background: var(--timeline-bg);
  color: var(--timeline-text);
  border-radius: 2rem;
  border: 1px solid var(--timeline-border);
  max-width: 800px;
  margin: 0 auto;
  min-height: 580px;
  overflow: hidden;
  user-select: none;
  transition: box-shadow 0.5s ease;
}

.timeline-canvas-container {
  position: absolute;
  inset: 0;
  z-index: 1;
  cursor: ns-resize;
  pointer-events: auto;
}

.timeline-canvas-container canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.timeline-info-panel {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
  pointer-events: none;
}

.timeline-meta-header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.timeline-age {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--timeline-text-muted);
}

.timeline-era-name {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 300;
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--timeline-text);
}

.timeline-temp {
  font-size: clamp(5rem, 16vw, 8.5rem);
  font-weight: 100;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--timeline-text);
  margin: 0;
}

.timeline-temp-unit {
  font-size: 2.5rem;
  font-weight: 200;
  vertical-align: super;
  margin-left: 0.25rem;
}

.timeline-ruler-container {
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 280px;
  align-items: flex-end;
  z-index: 3;
}

.timeline-ruler-track {
  position: absolute;
  right: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--timeline-divider);
}

.timeline-ruler-notch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  transition: transform 0.2s;
}

.timeline-notch-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--timeline-ruler-text);
  opacity: 0.5;
  transition: opacity 0.2s, color 0.2s, text-shadow 0.2s;
  letter-spacing: 0.05em;
}

.timeline-notch-line {
  width: 12px;
  height: 2px;
  background: var(--timeline-divider);
  transition: width 0.2s, background-color 0.2s;
}

.timeline-ruler-notch.active .timeline-notch-label {
  opacity: 1;
  color: var(--timeline-highlight);
}

.timeline-ruler-notch.active .timeline-notch-line {
  width: 24px;
  background: var(--timeline-highlight);
}