/* TOC block */
.toc {
  background: var(--bg-dark);
  border-radius: var(--radius);
  padding: var(--pad-card);
  margin-block: var(--space-section);
  box-shadow: var(--shadow-card);
}
.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 1rem;
  color: var(--heading);
  font-weight: 700;
  font-size: var(--fs-h3);
}
.toc__arrow { transition: transform var(--transition); font-size: 0.8em; }
.toc__toggle[aria-expanded="false"] .toc__arrow { transform: rotate(-90deg); }

.toc__list {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  overflow: hidden;
  margin-top: 1rem;
}
.toc__list[hidden] { display: none; }
.toc__list li { border-bottom: 1px solid rgba(255, 255, 255, 0.05); }
.toc__list li:last-child { border-bottom: none; }
.toc__link {
  display: block;
  padding: 0.55rem 0.25rem;
  color: var(--text);
  transition: color var(--transition), padding-left var(--transition);
}
.toc__link:hover { color: var(--heading); padding-left: 0.5rem; }