/* toc.css */
.toc {
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.5rem 0.5rem;
  margin-top: var(--space-section);
}
.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--color-white);
  font-weight: var(--fw-bold);
  font-size: 1.05rem;
  text-align: left;
}
.toc__toggle:hover { background: var(--color-bg-dark); }
.toc__arrow { color: var(--color-heading); transition: transform var(--transition); }
.toc__toggle[aria-expanded="false"] .toc__arrow { transform: rotate(-90deg); }

.toc__list {
  display: grid;
  gap: 0.15rem;
  padding: 0.4rem 0.5rem 0.6rem;
  overflow: hidden;
  transition: max-height var(--transition), opacity var(--transition);
}
.toc__list.is-collapsed { max-height: 0; opacity: 0; padding-block: 0; }

.toc__link {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: color var(--transition), background-color var(--transition);
}
.toc__link:hover { color: var(--color-heading); background: var(--color-bg-dark); }
.toc__link::before { content: "→ "; color: var(--color-border); }