.timeline {
  position: relative;
  padding-left: 3rem;
  margin-top: 1rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0.45rem;
  top: 0.5rem;
  bottom: 1rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue), transparent);
}

.tl-item {
  position: relative;
  margin-bottom: 2.4rem;
}

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

.tl-dot {
  position: absolute;
  left: -3rem;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--blue);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--blue);
  translate: 0.15rem 0;
}

.tl-item.tl-current .tl-dot {
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--accent), 0 0 12px 3px rgba(79, 156, 249, 0.4);
  animation: tl-pulse 2s ease-in-out infinite;
}

@keyframes tl-pulse {
  0%, 100% { box-shadow: 0 0 0 2px var(--accent), 0 0 12px 3px rgba(79,156,249,.4); }
  50%       { box-shadow: 0 0 0 4px var(--accent), 0 0 20px 6px rgba(79,156,249,.2); }
}

.tl-date {
  font-family: 'DM Mono', monospace;
  font-size: 0.78rem;
  color: var(--blue);
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.tl-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.8rem;
  transition: border-color 0.2s;
}

.tl-item.tl-current .tl-card {
  border-color: var(--border-bright);
}

.tl-card:hover {
  border-color: var(--border-bright);
}

.tl-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 0.25rem;
}

.tl-sub {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.6rem;
}

.tl-desc {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

.tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.9rem;
}

.tl-badge {
  display: inline-block;
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
  background: var(--blue-dim);
  color: var(--blue);
  border: 1px solid var(--border);
}

.tl-badge.badge-accent {
  background: rgba(79, 156, 249, 0.15);
  color: var(--accent);
  border-color: var(--border-bright);
}