.toc {
  background: var(--color-bg-dark);
  border-radius: var(--radius);
  padding: 0.5rem 1rem;
  /* Space above (from the intro) matches the section gap used before H2s */
  margin-block: var(--space-section);
}

.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 1rem;
  padding: 0.85rem 0;
  color: var(--color-heading);
  font-weight: var(--fw-bold);
  font-size: var(--fs-h3);
  text-align: left;
}

.toc__arrow {
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 7px solid currentColor;
  transition: transform var(--transition);
  flex-shrink: 0;
}

.toc__toggle[aria-expanded="false"] .toc__arrow {
  transform: rotate(-90deg);
}

.toc__panel {
  overflow: hidden;
  transition: height var(--transition);
}

.toc__panel[hidden] {
  display: none;
}

.toc__list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding-block: 0.25rem 0.85rem;
}

.toc__list li {
  border-block-start: 1px solid var(--color-line);
}

.toc__list li:first-child {
  border-block-start: none;
}

.toc__link {
  display: block;
  padding: 0.6rem 0.5rem;
  color: var(--color-text);
  font-weight: var(--fw-medium);
  transition: color var(--transition), padding-inline-start var(--transition);
}

.toc__link::before {
  content: "›";
  color: var(--color-btn-border);
  margin-inline-end: 0.5rem;
}

.toc__link:hover {
  color: var(--color-white);
  padding-inline-start: 0.85rem;
}

@media (prefers-reduced-motion: reduce) {
  .toc__panel {
    transition: none;
  }
}