/* toc.css */
.toc {
  background: var(--color-card);
  border-radius: var(--radius-card);
  padding: 0.5rem 0.75rem;
  margin-block: var(--space-section) 0;
}
.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.85rem 0.75rem;
  color: var(--color-white);
  font-weight: var(--fw-bold);
  font-size: 1.05rem;
}
.toc__arrow {
  width: 0; height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 7px solid var(--color-heading);
  transition: transform var(--transition);
}
.toc__toggle[aria-expanded="false"] .toc__arrow { transform: rotate(-90deg); }

.toc__list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.5rem 0.25rem 0.75rem;
  overflow: hidden;
}
.toc__list[hidden] { display: none; }
.toc__item { display: block; }
.toc__link {
  display: block;
  padding: 0.5rem 0.75rem;
  color: var(--color-text);
  border-radius: 4px;
  border-left: 2px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}
.toc__link:hover, .toc__link:focus-visible {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-heading);
  border-left-color: var(--color-heading);
}