/* ========================================
   Timeline Page Styles
   ======================================== */

/* === Timeline Container === */

.timeline {
  position: relative;
  padding: var(--space-8) 0;
}

/* Central vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--color-primary) 5%,
    var(--color-primary) 95%,
    transparent
  );
}

/* Progress fill line (JS-driven) */
.timeline-progress {
  position: absolute;
  left: 20px;
  top: 0;
  width: 3px;
  height: 0;
  background: linear-gradient(
    to bottom,
    var(--color-gold),
    var(--color-gold-light)
  );
  z-index: 1;
  transition: height 50ms linear;
}

/* === Timeline Items === */

.timeline-item {
  position: relative;
  margin-bottom: var(--space-12);
  display: flex;
  align-items: flex-start;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

/* === Year Marker === */

.timeline-marker {
  position: absolute;
  left: 20px;
  transform: translateX(-50%);
  z-index: 2;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--color-white);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.timeline-year {
  color: var(--color-white);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-xs);
}

.timeline-marker.is-active {
  background: var(--color-gold);
  transform: translateX(-50%) scale(1.15);
  box-shadow: 0 0 0 6px rgba(196, 164, 60, 0.25), var(--shadow-md);
}

.timeline-marker.is-active .timeline-year {
  color: var(--color-primary-dark);
}

/* === Timeline Content === */

.timeline-content {
  width: calc(100% - 60px);
  margin-left: 60px;
}

/* === Timeline Card === */

.timeline-card {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.timeline-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
}

.timeline-card__image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background-color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.7);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 500;
}

img.timeline-card__image {
  display: block;
}

.timeline-card__body {
  padding: var(--space-6);
}

.timeline-card__year-badge {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--border-radius-full);
  margin-bottom: var(--space-3);
}

.timeline-card__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
  color: var(--color-gray-900);
}

.timeline-card__text {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  line-height: 1.7;
}

/* === Desktop: Alternating Layout === */

@media (min-width: 768px) {
  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-progress {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-marker {
    left: 50%;
    width: 56px;
    height: 56px;
  }

  .timeline-year {
    font-size: var(--text-sm);
  }

  .timeline-content {
    width: 44%;
  }

  /* Left-aligned items (default) */
  .timeline-item .timeline-content {
    margin-left: 0;
    margin-right: auto;
    padding-right: var(--space-8);
    text-align: right;
  }

  /* Right-aligned items */
  .timeline-item--right .timeline-content {
    margin-left: auto;
    margin-right: 0;
    padding-right: 0;
    padding-left: var(--space-8);
    text-align: left;
  }

  .timeline-item .timeline-card__body {
    text-align: right;
  }

  .timeline-item--right .timeline-card__body {
    text-align: left;
  }

  .timeline-card__image {
    height: 200px;
  }
}

/* === Era Divider === */

.timeline-era {
  text-align: center;
  margin: var(--space-12) 0;
  position: relative;
}

.timeline-era__label {
  display: inline-block;
  background: var(--color-gold);
  color: var(--color-primary-dark);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-6);
  border-radius: var(--border-radius-full);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: relative;
  z-index: 2;
}

@media (min-width: 768px) {
  .timeline-era {
    margin: var(--space-16) 0;
  }
}