/* ═══════════════════════════════════════════════════════════════
   Timeline Page — Stunning, Interactive Design
   ═══════════════════════════════════════════════════════════════ */

/* HERO — Dark green gradient with Assamese pattern */
.timeline-hero {
  background: linear-gradient(135deg, #0D3B1A 0%, #1A6B2E 40%, #0D3B1A 100%);
  padding: 4rem 1.5rem 3.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 24px rgba(13, 59, 26, 0.35);
}

/* Assamese-inspired geometric pattern overlay */
.timeline-hero-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.12;
  background-image:
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 20px,
      rgba(201, 168, 76, 0.3) 20px,
      rgba(201, 168, 76, 0.3) 21px
    ),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 20px,
      rgba(201, 168, 76, 0.2) 20px,
      rgba(201, 168, 76, 0.2) 21px
    );
  pointer-events: none;
}

.timeline-hero-inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.timeline-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: white;
  margin: 0 0 0.25rem;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
}

.timeline-hero-subtitle {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.9);
  margin: 0 0 0.5rem;
}

.timeline-hero-desc {
  color: rgba(255, 255, 255, 0.85);
  font-size: 1.05rem;
  margin: 0 0 2rem;
}

.timeline-hero-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.timeline-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.95rem;
}

.timeline-stat-num {
  font-family: var(--font-title);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 0.15rem;
}

/* FILTER TABS — Sticky below hero */
.timeline-filters-wrap {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--cream);
  border-bottom: 2px solid rgba(201, 168, 76, 0.3);
  padding: 0.75rem 1.5rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.timeline-filters {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.timeline-filter {
  padding: 0.5rem 1rem;
  border-radius: 999px;
  border: 2px solid var(--gold);
  background: transparent;
  color: var(--brown-dark);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.timeline-filter:hover {
  background: rgba(201, 168, 76, 0.15);
}

.timeline-filter.active {
  background: var(--gold);
  color: var(--brown-dark);
}

/* PAGE LAYOUT */
.timeline-page-wrap {
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  gap: 2rem;
}

.timeline-main {
  flex: 1;
  min-width: 0;
}

.timeline-empty {
  text-align: center;
  color: var(--color-muted);
  padding: 3rem;
}

/* TIMELINE TRACK — Center line + alternating nodes */
.timeline-track {
  position: relative;
  padding: 1rem 0;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  margin-left: -1.5px;
  background: linear-gradient(180deg, var(--gold), #E8C97A, var(--gold));
  border-radius: 2px;
}

/* TIMELINE NODE — Alternating left/right */
.timeline-node {
  position: relative;
  margin-bottom: 2.5rem;
  scroll-margin-top: 120px;
}

.timeline-node-inner {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 1rem;
}

.timeline-left .timeline-node-inner {
  flex-direction: row;
}

.timeline-right .timeline-node-inner {
  flex-direction: row-reverse;
}

.timeline-card-wrap {
  flex: 1;
  max-width: 45%;
  min-width: 280px;
}

.timeline-spacer {
  width: 24px;
  flex-shrink: 0;
}

/* YEAR CIRCLE / TIMELINE DOTS — 48px, GOLD #C9A84C, dark brown text */
.timeline-year-circle,
.timeline-dot {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #C9A84C !important;
  border: 2px solid #C9A84C;
  border-color: #C9A84C !important;
  color: var(--brown-dark);
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 12px rgba(201, 168, 76, 0.4);
  position: relative;
  z-index: 2;
}

/* CONTENT CARD */
.timeline-card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--gold);
  transition: transform 0.2s, box-shadow 0.2s;
}

.timeline-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.timeline-card-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.timeline-card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin: 0 0 0.5rem;
  line-height: 1.4;
}

.timeline-card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0 0 0.75rem;
}

.timeline-person-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(26, 107, 46, 0.1);
  color: var(--green-mid);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.2s;
}

.timeline-person-badge:hover {
  background: rgba(26, 107, 46, 0.2);
  text-decoration: none;
}

/* SCROLL ANIMATION — cards slide in from left/right when in viewport */
.timeline-card-wrap {
  opacity: 0;
  transform: translateX(var(--tl-dir, -40px));
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.timeline-left .timeline-card-wrap { --tl-dir: -40px; }
.timeline-right .timeline-card-wrap { --tl-dir: 40px; }

.timeline-node.timeline-visible .timeline-card-wrap {
  opacity: 1;
  transform: translateX(0);
}

.timeline-node:nth-child(1).timeline-visible .timeline-card-wrap { transition-delay: 0.05s; }
.timeline-node:nth-child(2).timeline-visible .timeline-card-wrap { transition-delay: 0.1s; }
.timeline-node:nth-child(3).timeline-visible .timeline-card-wrap { transition-delay: 0.15s; }
.timeline-node:nth-child(4).timeline-visible .timeline-card-wrap { transition-delay: 0.2s; }
.timeline-node:nth-child(5).timeline-visible .timeline-card-wrap { transition-delay: 0.25s; }
.timeline-node:nth-child(6).timeline-visible .timeline-card-wrap { transition-delay: 0.3s; }
.timeline-node:nth-child(7).timeline-visible .timeline-card-wrap { transition-delay: 0.35s; }
.timeline-node:nth-child(8).timeline-visible .timeline-card-wrap { transition-delay: 0.4s; }
.timeline-node:nth-child(9).timeline-visible .timeline-card-wrap { transition-delay: 0.45s; }
.timeline-node:nth-child(10).timeline-visible .timeline-card-wrap { transition-delay: 0.5s; }
.timeline-node:nth-child(n+11).timeline-visible .timeline-card-wrap { transition-delay: 0.55s; }

@media (prefers-reduced-motion: reduce) {
  .timeline-node {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* YEAR JUMP NAV — Fixed right sidebar, desktop only */
.timeline-year-nav {
  display: none;
  width: 140px;
  flex-shrink: 0;
}

@media (min-width: 1024px) {
  .timeline-year-nav {
    display: block;
    position: sticky;
    top: 140px;
    align-self: flex-start;
  }
}

.timeline-year-nav-inner {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem;
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  border: 1px solid rgba(201, 168, 76, 0.2);
}

.timeline-year-nav-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.timeline-year-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--green-mid);
  text-decoration: none;
  padding: 0.25rem 0;
  transition: color 0.2s;
}

.timeline-year-link:hover {
  color: var(--gold);
  text-decoration: none;
}

/* MOBILE — Stack timeline vertically, no alternating */
@media (max-width: 768px) {
  .timeline-hero {
    padding: 3rem 1rem 2.5rem;
  }

  .timeline-hero-stats {
    gap: 1.5rem;
  }

  .timeline-filters-wrap {
    padding: 0.5rem 1rem;
  }

  .timeline-filters {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0.25rem;
    -webkit-overflow-scrolling: touch;
  }

  .timeline-filter {
    flex-shrink: 0;
  }

  .timeline-page-wrap {
    flex-direction: column;
    padding: 1.5rem 1rem 3rem;
  }

  .timeline-line {
    left: 24px;
    margin-left: 0;
  }

  .timeline-node-inner {
    flex-direction: row !important;
    align-items: flex-start;
    gap: 1rem;
  }

  .timeline-year-circle {
    order: -1;
    width: 40px;
    height: 40px;
    font-size: 0.75rem;
  }

  .timeline-card-wrap {
    max-width: none;
    flex: 1;
    min-width: 0;
  }

  .timeline-spacer {
    display: none;
  }

  .timeline-left .timeline-node-inner,
  .timeline-right .timeline-node-inner {
    flex-direction: row !important;
  }
}