/* TOC block (BEM: toc) */
.toc__box {
  background: var(--color-bg-dark);
  border-radius: var(--radius);
  padding: 0.5rem 1.5rem;
}
.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.9rem 0;
  color: var(--color-white);
  font-weight: var(--fw-semibold);
  font-size: 1.0625rem;
}
.toc__arrow { transition: transform var(--transition); color: var(--color-heading-accent); }
.toc__toggle[aria-expanded="true"] .toc__arrow { transform: rotate(180deg); }

.toc__list {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--transition);
}
.toc__list.is-open { max-height: 40rem; }
.toc__list li { border-top: 1px solid rgba(255, 255, 255, 0.06); }
.toc__list a {
  display: block;
  padding: 0.75rem 0.25rem;
  color: var(--color-text);
  font-size: 0.9375rem;
}
.toc__list a:hover { color: var(--color-heading-accent); }