/* ==========================================================================
   toc block (BEM: toc)
   ========================================================================== */
.toc {
  background: var(--color-card-bg);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.4rem;
  margin-bottom: var(--space-section);
}

.toc__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-white);
  font-weight: var(--fw-semibold);
  font-size: 1rem;
}

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

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

.toc__list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), margin-top var(--transition-base);
}

.toc__list.is-open {
  margin-top: 1rem;
  max-height: 2000px;
  overflow: visible;
}

.toc__list a {
  display: block;
  color: var(--color-text-main);
  font-size: 0.9rem;
  padding-block: 0.15rem;
}

.toc__list a:hover {
  color: var(--color-accent-light);
}