.chrono-pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: stretch;
  margin: 1.25rem 0;
}

.chrono-card {
  border: 1px solid var(--border-color, #d5dbe3);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  background: var(--surface-elevated, #fff);
  border-top: 4px solid #566573;
}

.chrono-card__region {
  font-size: 0.85rem;
  color: var(--text-muted, #5c6b7a);
  margin-bottom: 0.35rem;
}

.chrono-card__label {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
}

.chrono-card__year {
  margin-top: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-muted, #5c6b7a);
}

.chrono-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-muted, #5c6b7a);
}

.chrono-choices {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1rem 0;
}

.chrono-choice.is-selected {
  outline: 2px solid var(--accent, #2980b9);
}

.chrono-choice.is-kbd-current {
  outline: 3px solid var(--color-primary, #2980b9);
  outline-offset: 2px;
}

.chrono-timeline-wrap {
  margin: 1.25rem 0 0.5rem;
  padding: 0.75rem 0.5rem 0.25rem;
  border-radius: 8px;
  background: var(--surface-muted, #f4f6f8);
}

.chrono-timeline svg {
  width: 100%;
  max-width: 640px;
  height: auto;
  display: block;
  margin: 0 auto;
}

.chrono-nl-axis {
  stroke: #7f8c8d;
  stroke-width: 2;
}

.chrono-nl-tick {
  stroke: #bdc3c7;
  stroke-width: 1;
}

.chrono-nl-tick-label {
  fill: #7f8c8d;
  font-size: 10px;
  text-anchor: middle;
}

.chrono-nl-point {
  stroke: #fff;
  stroke-width: 2;
}

.chrono-nl-label {
  font-size: 11px;
  text-anchor: middle;
  fill: #2c3e50;
}

.chrono-nl-year {
  font-size: 10px;
  text-anchor: middle;
  fill: #7f8c8d;
}

@media (max-width: 640px) {
  .chrono-pair {
    grid-template-columns: 1fr;
  }
  .chrono-vs {
    padding: 0.25rem 0;
  }
}