.toc {
  padding-block: 1.5rem;
}

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

.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--color-heading-gold);
}

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

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

.toc__nav {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows var(--transition-base), opacity var(--transition-base), margin var(--transition-base);
}

.toc__nav.is-open {
  grid-template-rows: 1fr;
  opacity: 1;
  margin-block-start: 1rem;
}

.toc__nav-inner {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.toc__link {
  font-size: var(--font-size-small);
  color: var(--color-text-main);
  transition: color var(--transition-fast);
}

.toc__link:hover,
.toc__link:focus-visible {
  color: var(--color-heading-gold);
}