/* ==========================================================================
   Table of contents (quick navigation)
   ========================================================================== */
.toc {
  background: var(--color-card);
  border-radius: var(--radius-card);
  padding: var(--space-card-padding);
  margin-block: var(--space-section) 0;
}
.toc__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  text-align: left;
  color: var(--color-heading);
  font-weight: var(--fw-bold);
  font-size: var(--fs-h3);
}
.toc__arrow { transition: transform var(--transition); flex-shrink: 0; }
.toc__header[aria-expanded="true"] .toc__arrow { transform: rotate(180deg); }
.toc__panel { margin-top: var(--space-h3-text); }
.toc__panel[hidden] { display: none; }
.toc__list { display: grid; gap: 0.5rem; }
.toc__link {
  display: block;
  padding: 0.5rem 0.6rem;
  border-radius: 4px;
  color: var(--color-text);
  border-left: 3px solid transparent;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}
.toc__link:hover {
  color: var(--color-white);
  background: rgba(255, 211, 41, 0.06);
  border-left-color: var(--color-heading);
}