.post-content img {
  height: auto;
  margin-inline: auto;
}

.post-content mark {
  padding: 0.08em 0.22em;
  border-radius: 0.2em;
  background: color-mix(in srgb, #e7b85e 42%, transparent);
  color: inherit;
}

.math-block {
  margin: 1.25rem 0;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--code-bg);
  text-align: center;
}

.math-block code {
  padding: 0;
  background: transparent;
  white-space: pre-wrap;
}

.legacy-timeline {
  position: relative;
  margin: 2rem 0;
  padding-left: 1.4rem;
  border-left: 1px solid var(--border);
}

.legacy-timeline > h2 {
  margin: 0 0 1.6rem;
}

.timeline-item {
  position: relative;
  margin: 0 0 1.75rem;
}

.timeline-item::before {
  position: absolute;
  top: 0.45rem;
  left: -1.7rem;
  width: 0.55rem;
  height: 0.55rem;
  border: 2px solid var(--theme);
  border-radius: 50%;
  background: var(--primary);
  content: "";
}

.timeline-date {
  margin-bottom: 0.45rem;
  color: var(--primary);
  font-weight: 600;
}

.timeline-date span {
  margin-left: 0.6rem;
  color: var(--secondary);
  font-size: 0.85em;
  font-weight: 400;
}

.timeline-body {
  color: var(--content);
}

.toc-level-3 {
  margin-left: 1rem;
}

.toc-level-4 {
  margin-left: 2rem;
}

@media (max-width: 640px) {
  .legacy-timeline {
    padding-left: 1.1rem;
  }

  .timeline-item::before {
    left: -1.4rem;
  }
}