:root {
  color-scheme: light dark;
  --bg: #faf8f5;
  --fg: #1a1a1a;
  --muted: #5c5c5c;
  --dock-bg: rgba(255, 255, 255, 0.92);
  --dock-border: rgba(0, 0, 0, 0.08);
  --highlight-bg: #fff3bf;
  --highlight-fg: #1a1a1a;
  --accent: #2b6cb0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141414;
    --fg: #f0ebe3;
    --muted: #a39e96;
    --dock-bg: rgba(30, 30, 30, 0.94);
    --dock-border: rgba(255, 255, 255, 0.1);
    --highlight-bg: #5c4d1a;
    --highlight-fg: #fff8e1;
    --accent: #63b3ed;
  }
}

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

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
}

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 8rem;
}

.main > p {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

.readme-viewport {
  outline: none;
}

.readme-viewport .readme-line {
  margin: 0 0 0.35rem;
}

.readme-viewport .readme-line--empty {
  min-height: 0.75rem;
}

.timeline-highlight {
  background: var(--highlight-bg);
  color: var(--highlight-fg);
  padding: 0.05em 0.15em;
  border-radius: 2px;
  box-decoration-break: clone;
}

.timeline-dock {
  position: fixed;
  left: 50%;
  bottom: max(1rem, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 100;
  width: min(90vw, 36rem);
  padding: 0.65rem 1rem 0.75rem;
  background: var(--dock-bg);
  border: 1px solid var(--dock-border);
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(8px);
}

.timeline-dock__inner {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.timeline-dock__labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.timeline-slider {
  width: 100%;
  height: 2.25rem;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
  touch-action: manipulation;
}

.timeline-change-label {
  margin: 0;
  min-height: 2.75rem;
  font-size: 0.85rem;
  font-family: system-ui, -apple-system, Segoe UI, sans-serif;
  color: var(--muted);
  text-align: center;
  line-height: 1.35;
}

.timeline-change-label strong {
  color: var(--fg);
  font-weight: 600;
}

.timeline-ts {
  font-size: 0.78rem;
  opacity: 0.85;
}