/* ==========================================================================
   History / Timeline
   ========================================================================== */

.timeline-section {
  position: relative;
  background: var(--color-parchment);
  padding: 80px 0 100px;
}

.timeline-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("../assets/images/13_old_map_texture.jpg") repeat;
  background-size: 1100px;
  opacity: 0.1;
  pointer-events: none;
}

.timeline-filter-row {
  position: relative;
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.timeline-filter-btn {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: 9px 18px;
  border: 1px solid var(--color-gold-deep);
  border-radius: 30px;
  background: transparent;
  color: var(--color-sepia-dark);
  transition: background 0.2s ease, color 0.2s ease;
}

.timeline-filter-btn.active,
.timeline-filter-btn:hover {
  background: var(--color-gold-deep);
  color: var(--color-parchment-light);
}

.timeline-rail {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.timeline-rail::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, var(--color-gold-line) 6%, var(--color-gold-line) 94%, transparent);
}

.timeline-event {
  position: relative;
  width: 50%;
  padding: 0 48px 64px;
}

.timeline-event:nth-child(odd) {
  left: 0;
  text-align: right;
}

.timeline-event:nth-child(even) {
  left: 50%;
  text-align: left;
}

.timeline-event::before {
  content: "";
  position: absolute;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--color-parchment);
  border: 3px solid var(--color-gold);
  z-index: 1;
}

.timeline-event:nth-child(odd)::before {
  right: -8px;
}

.timeline-event:nth-child(even)::before {
  left: -8px;
}

.timeline-card {
  display: inline-block;
  background: var(--color-parchment-light);
  border: 1px solid var(--color-parchment-dark);
  border-radius: var(--radius-card);
  padding: 22px 26px;
  box-shadow: var(--shadow-soft);
  max-width: 420px;
  text-align: left;
}

.timeline-card-year {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--color-gold-deep);
  margin-bottom: 6px;
}

.timeline-card-category {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 10.5px;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-navy);
  background: rgba(20, 36, 73, 0.08);
  border: 1px solid rgba(20, 36, 73, 0.2);
  border-radius: 3px;
  padding: 3px 9px;
  margin-bottom: 10px;
}

.timeline-card-title {
  font-size: 19px;
  color: var(--color-sepia-dark);
  margin-bottom: 10px;
}

.timeline-card img {
  width: 100%;
  border-radius: 3px;
  margin-bottom: 12px;
  filter: sepia(0.3);
}

.timeline-card-desc {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-on-parchment-muted);
}

.timeline-empty {
  text-align: center;
  padding: 60px 20px;
  font-family: var(--font-caption);
  font-style: italic;
  font-size: 18px;
  color: var(--text-on-parchment-muted);
}