/* ============================================================
   Table of contents
   ============================================================ */
.toc {
  background: var(--color-bg-dark);
  border-radius: var(--radius-card);
  padding: 0.5rem 0.75rem;
  margin-block: var(--space-paragraph);
}
.toc[hidden] { display: none; }
.toc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: 1rem;
  padding: 0.75rem 0.5rem;
  color: var(--color-heading);
  font-weight: var(--fw-bold);
  font-size: 1.05rem;
}
.toc__arrow { transition: transform var(--transition-base); color: var(--color-border); }
.toc__toggle[aria-expanded="false"] .toc__arrow { transform: rotate(-90deg); }
.toc__list {
  display: grid;
  gap: 0.15rem;
  overflow: hidden;
  padding: 0.25rem 0.5rem 0.5rem;
}
.toc__list[hidden] { display: none; }
.toc__list li { display: block; }
.toc__list a {
  display: block;
  padding: 0.5rem 0.6rem;
  border-radius: 4px;
  color: var(--color-text);
  font-weight: var(--fw-medium);
  border-left: 2px solid transparent;
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}
.toc__list a:hover {
  background: rgba(255, 179, 117, 0.1);
  color: var(--color-heading);
  border-left-color: var(--color-accent-bg);
}