/* ═══════════════════════════════════════════════════════════════════
   AURALIS · Timeline component (Task KK)
   ═══════════════════════════════════════════════════════════════════ */

.tl--vertical {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.tl-item {
  display: flex;
  gap: 14px;
}

.tl-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 20px;
}
.tl-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, hsl(38 80% 55%), hsl(38 70% 45%));
  box-shadow: 0 0 10px hsl(38 80% 55% / 0.4);
  flex-shrink: 0;
}
.tl-line {
  flex: 1;
  width: 2px;
  min-height: 24px;
  background: hsl(38 50% 50% / 0.25);
}
[data-theme="dark"] .tl-line {
  background: hsl(38 50% 40% / 0.2);
}

.tl-card {
  flex: 1;
  padding: 12px 14px;
  margin-bottom: 12px;
  border-radius: var(--radius-sm);
  transition: background var(--dur) var(--ease);
}
[data-theme="light"] .tl-card, :root:not([data-theme]) .tl-card {
  background: var(--surface);
  box-shadow: var(--shadow-card-sm);
}
[data-theme="dark"] .tl-card {
  background: hsl(220 25% 6% / 0.5);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
}
.tl-card.is-expanded {
  background: hsl(38 30% 50% / 0.06);
}
[data-theme="dark"] .tl-card.is-expanded {
  background: hsl(38 30% 20% / 0.15);
}

.tl-period {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: hsl(38 70% 50%);
  margin-bottom: 4px;
}
[data-theme="dark"] .tl-period { color: hsl(38 80% 70%); }

.tl-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.35;
}

.tl-desc {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-muted);
  animation: tlDescIn 0.25s ease;
}
@keyframes tlDescIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ═══ HORIZONTAL VARIANT ═══ */
.tl--horizontal {
  display: flex;
  gap: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
}
.tl--horizontal .tl-item {
  flex-direction: column;
  min-width: 160px;
  flex-shrink: 0;
}
.tl--horizontal .tl-marker {
  flex-direction: row;
  width: auto;
  height: 20px;
  margin-bottom: 8px;
}
.tl--horizontal .tl-line {
  height: 2px;
  width: 100%;
  min-height: 0;
  min-width: 20px;
}
.tl--horizontal .tl-card { margin-bottom: 0; margin-right: 8px; }

@media (prefers-reduced-motion: reduce) {
  .tl-desc { animation: none; }
}