@layer components {
  :root {
    --timeline-line-width: 2px;
    --timeline-line-color: var(--color-border);
    --timeline-marker-size: 16px;
    --timeline-marker-border: 3px;
    --timeline-gap: var(--space-10);
    --timeline-content-gap: var(--space-6);
  }

  .timeline {
    position: relative;
    padding-left: calc(var(--timeline-marker-size) / 2 + var(--timeline-content-gap));
  }

  .timeline::before {
    content: '';
    position: absolute;
    left: calc(var(--timeline-marker-size) / 2 - var(--timeline-line-width) / 2);
    top: 0;
    bottom: 0;
    width: var(--timeline-line-width);
    background: var(--timeline-line-color);
  }

  .timeline__item {
    position: relative;
    padding-bottom: var(--timeline-gap);
  }

  .timeline__item:last-child {
    padding-bottom: 0;
  }

  .timeline__marker {
    position: absolute;
    left: calc(-1 * var(--timeline-content-gap) - var(--timeline-marker-size) / 2 - var(--timeline-marker-border));
    top: 0;
    width: var(--timeline-marker-size);
    height: var(--timeline-marker-size);
    border: var(--timeline-marker-border) solid var(--color-bg-primary);
    border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 0 var(--timeline-line-width) var(--timeline-line-color);
    z-index: 1;
  }

  .timeline__content {
    padding-top: var(--space-1);
  }

  .timeline__title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 500;
    line-height: var(--leading-snug);
    letter-spacing: var(--tracking-tight);
    color: var(--color-text-primary);
    margin: 0 0 var(--space-2);
  }

  .timeline__description {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--color-text-secondary);
    margin: 0;
  }

  .timeline__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-3);
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
  }

  .timeline--alt .timeline__item:nth-child(even) .timeline__marker {
    background: var(--color-accent-muted);
  }

  .timeline--minimal::before {
    background: linear-gradient(
      to bottom,
      var(--color-border) 0%,
      var(--color-border) 50%,
      transparent 100%
    );
  }

  .timeline--minimal .timeline__marker {
    border-width: 2px;
    box-shadow: none;
  }
}