.toc {
  flex: 0 0 12rem;
  position: sticky;
  top: 3rem; /* sticks under header */
  align-self: flex-start;
  font-size: 0.9rem;
  line-height: 1.5;
  margin-top: 12rem;
  margin-left: 2rem;
}

.toc-header {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid #ddd;
  color: #000;
}

.toc:empty {
  display: none; /* hide if no content */
}

.toc ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.toc li {
  margin: 0.2rem 0;
}

.toc li ul {
  margin-left: 1rem; /* indent nested h3 */
}

.toc a {
  color: #444;
  text-decoration: none;
  transition: color 0.2s ease;
}

.toc a:hover,
.toc a.active {
  color: var(--primary); /* red highlight */
/*  font-weight: 600; */
}

.toc-anchor {
  display: block;
  height: 0;
  margin: 0;
  padding: 0;
}

.post-content .toc-anchor {
  scroll-margin-top: 80px;
}

@media (max-width: 60rem) {
  .toc { display: none !important; }
}