/* ============================================================
   TOC — Table of Contents
   ============================================================ */
.toc {
  background: var(--color-bg-dark);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: var(--section-gap);
  overflow: hidden;
}
.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1rem 1.25rem;
  background: none;
  cursor: pointer;
  color: var(--color-heading);
  font-weight: var(--fw-semibold);
  font-size: var(--font-size-sm);
  text-align: left;
  gap: 0.5rem;
}
.toc__toggle:hover { background: rgba(255,255,255,0.03); }
.toc__arrow {
  flex-shrink: 0;
  transition: transform var(--transition-base);
  color: var(--color-accent);
  font-size: 1rem;
}
.toc[data-open="true"] .toc__arrow { transform: rotate(180deg); }

.toc__list {
  display: none;
  flex-direction: column;
  padding: 0.5rem 1.25rem 1.25rem;
  gap: 0.5rem;
}
.toc[data-open="true"] .toc__list { display: flex; }
.toc__item { display: block; }
.toc__link {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base);
  display: block;
}
.toc__link:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}