.timeline {
  --timeline-line: 0.25rem;
  --timeline-dot: 1.1rem;
  --timeline-gutter: 3rem;
  position: relative;
  padding-left: var(--timeline-gutter);
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0;
  left: calc((var(--timeline-dot) - var(--timeline-line)) / 2);
  width: var(--timeline-line);
  border-radius: var(--timeline-line);
  background: linear-gradient(
    to bottom,
    var(--md-accent-fg-color) 0%,
    var(--md-primary-fg-color) 50%,
    var(--md-default-fg-color--lightest) 100%
  );
}

.timeline-item {
  position: relative;
  padding-bottom: 1.5rem;
}

.timeline-item > h2:first-child {
  margin-top: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 0.35rem;
  left: calc(-1 * var(--timeline-gutter));
  width: var(--timeline-dot);
  height: var(--timeline-dot);
  border-radius: 50%;
  box-sizing: border-box;
  background: var(--md-default-bg-color);
  border: var(--timeline-line) solid var(--timeline-color);
}

.timeline-item.now   { --timeline-color: var(--md-accent-fg-color); }
.timeline-item.next  { --timeline-color: var(--md-primary-fg-color); }
.timeline-item.later { --timeline-color: var(--md-default-fg-color--lighter); }

.timeline-item.now::before {
  background: var(--timeline-color);
  box-shadow: 0 0 0 0.35rem color-mix(in srgb, var(--timeline-color) 25%, transparent);
}