/**
 * toc.css — BEM: toc, toc__*
 */

.toc {
  padding-block: 1.5rem;
}

.toc__box {
  background: var(--color-bg-dark);
  border-radius: var(--radius-card);
  padding: 1rem 1.25rem;
}

.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-weight: var(--font-weight-semibold);
  color: var(--color-heading-gold);
  font-size: var(--font-size-base);
}

.toc__arrow {
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.toc__toggle[aria-expanded="true"] .toc__arrow {
  transform: rotate(180deg);
}

.toc__list {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: 1fr;
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height var(--transition-slow), opacity var(--transition-base), margin-top var(--transition-slow);
}

.toc__list.is-open {
  max-height: 900px;
  opacity: 1;
  margin-top: 1rem;
}

.toc__list-item a {
  display: block;
  padding: 0.5rem 0.25rem;
  font-size: var(--font-size-small);
  color: var(--color-text-body);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.toc__list-item:last-child a {
  border-bottom: none;
}

.toc__list-item a:hover {
  color: var(--color-heading-gold);
}