/* =========================================================
   TIMELINE PAGE
   ========================================================= */

.timeline {
  position: relative;
  padding: 20px 0 40px;
}

.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  transform: translateX(-50%);
  background: var(--line);
  overflow: visible;
}

.timeline-line-fill {
  position: relative;
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, var(--gold-light), var(--gold));
  box-shadow: 0 0 16px rgba(201, 162, 75, 0.6);
  transition: height 0.1s linear;
}

/* Glowing marker that travels down the line as you scroll */
.timeline-traveler {
  position: absolute;
  left: 50%;
  top: 0%;
  width: 22px;
  height: 22px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, var(--gold-light) 0%, var(--gold) 55%, transparent 78%);
  box-shadow: 0 0 18px 4px rgba(230, 205, 133, 0.65);
  animation: travelerPulse 2.2s ease-in-out infinite;
  z-index: 3;
  pointer-events: none;
}

@keyframes travelerPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.25); }
}

.timeline-items {
  position: relative;
}

.timeline-item {
  position: relative;
  width: 50%;
  padding: 0 48px 72px;
  opacity: 0;
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.timeline-item.in-view { opacity: 1; transform: translateX(0) scale(1) !important; }

.timeline-item.left {
  left: 0;
  text-align: right;
  transform: translateX(-36px) scale(0.97);
}

.timeline-item.right {
  left: 50%;
  text-align: left;
  transform: translateX(36px) scale(0.97);
}

.timeline-dot {
  position: absolute;
  top: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--ink-panel);
  border: 2px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  transition: background 0.5s ease, box-shadow 0.5s ease, border-color 0.5s ease, transform 0.5s ease;
  z-index: 2;
}

.timeline-item.left .timeline-dot { right: -20px; }
.timeline-item.right .timeline-dot { left: -20px; }

.timeline-item.in-view .timeline-dot {
  background: radial-gradient(circle, var(--gold-light) 0%, var(--gold) 70%);
  border-color: var(--gold-light);
  box-shadow: 0 0 0 8px var(--gold-dim), 0 0 22px rgba(201, 162, 75, 0.5);
  transform: scale(1.05);
}

.timeline-card {
  position: relative;
  display: inline-block;
  background: linear-gradient(160deg, var(--ink-panel) 0%, var(--ink-panel-2) 100%);
  border: 1px solid var(--line);
  padding: 24px 28px;
  max-width: 420px;
  overflow: hidden;
  transition: border-color 0.4s ease, transform 0.4s ease, box-shadow 0.4s ease;
}

.timeline-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.timeline-card:hover {
  border-color: var(--gold);
  transform: translateY(-4px);
  box-shadow: var(--shadow-gold);
}

.timeline-card:hover::before { opacity: 1; }

.timeline-year {
  display: inline-block;
  color: var(--gold);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.timeline-estimated-flag {
  display: none;
}

.timeline-card h3 {
  font-family: "Noto Serif Bengali", var(--font-display);
  font-size: 19px;
  color: var(--ivory);
  margin-bottom: 8px;
  line-height: 1.4;
}

.timeline-card p {
  font-family: "Noto Sans Bengali", var(--font-body);
  color: var(--ivory-soft);
  font-size: 14px;
  line-height: 1.7;
}

.timeline-card img {
  width: 100%;
  margin-top: 14px;
  display: block;
}

@media (max-width: 768px) {
  .timeline-line { left: 24px; }
  .timeline-traveler { left: 24px; }

  .timeline-item,
  .timeline-item.left,
  .timeline-item.right {
    width: 100%;
    left: 0;
    text-align: left;
    padding: 0 16px 56px 66px;
    transform: translateX(20px) scale(0.97);
  }

  .timeline-item.left .timeline-dot,
  .timeline-item.right .timeline-dot {
    left: 4px;
    right: auto;
    width: 34px;
    height: 34px;
    font-size: 15px;
  }

  .timeline-card { max-width: 100%; }
}