/* =====================================================
   TIMELINE SECTION
===================================================== */
.timeline-section {
  padding: var(--space-2xl) 0;
  border-bottom: var(--border);
  background: var(--bg-root);
  position: relative;
  overflow: hidden;
}

.timeline-section::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40%;
  height: 100%;
  background: radial-gradient(ellipse at right, rgba(57, 255, 20, 0.02) 0%, transparent 70%);
  pointer-events: none;
}

.timeline-header {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-xl);
  align-items: end;
  margin-bottom: var(--space-2xl);
  padding: 0 var(--space-lg) 0 calc(var(--space-lg) + 2rem);
}

.timeline-header-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: 0.95;
  color: var(--text-primary);
}

.timeline-header-desc {
  font-family: var(--font-body);
  color: var(--text-secondary);
  max-width: 480px;
  border-left: 2px solid var(--accent);
  padding-left: var(--space-md);
}

/* The actual timeline */
.timeline {
  position: relative;
  padding: 0 var(--space-lg) 0 calc(var(--space-lg) + 2rem);
}

/* Vertical line */
.timeline::before {
  content: '';
  position: absolute;
  left: calc(var(--space-lg) + 2rem + 6px);
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom,
    var(--accent) 0%,
    var(--bg-border-bright) 40%,
    transparent 100%
  );
}

.timeline-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
  border-bottom: var(--border);
  position: relative;
  opacity: 0;
  transform: translateX(-24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Timeline dot */
.timeline-item::before {
  content: '';
  position: absolute;
  left: 3px;
  top: calc(var(--space-xl) + 12px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  background: var(--bg-root);
  z-index: 1;
}

.timeline-item.active::before {
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

.timeline-item:last-child {
  border-bottom: none;
}

.timeline-date-col {
  padding-top: 3px;
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: var(--space-sm);
}

.timeline-content {
  padding-bottom: var(--space-sm);
}

.timeline-content-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.timeline-title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  color: var(--text-primary);
  line-height: 1.1;
}

.timeline-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

/* Vertical connector from last real item to "future" */
.timeline-future {
  padding: var(--space-xl) 0;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

.timeline-future::before {
  content: '...';
  color: var(--accent);
  font-size: 1.5rem;
}

@media (max-width: 900px) {
  .timeline-header {
    grid-template-columns: 1fr;
    padding-left: var(--space-lg);
  }
  .timeline {
    padding-left: var(--space-lg);
  }
  .timeline::before {
    left: calc(var(--space-lg) + 6px);
  }
  .timeline-item::before {
    left: 3px;
  }
  .timeline-item {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
    padding-left: calc(var(--space-lg) + var(--space-sm));
  }
  .timeline-item::before {
    left: calc(var(--space-sm) - 2px);
  }
}