.toc { padding-block: 1.5rem 0; }
.toc__box {
  background: var(--color-card-bg);
  clip-path: var(--clip-corner);
  padding: 0.5rem 1.5rem;
}
.toc__toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1rem;
  color: var(--color-white);
  font-weight: var(--fw-semibold);
  font-size: 1rem;
}
.toc__arrow {
  transition: transform var(--transition-base);
  color: var(--color-heading-accent);
}
.toc__toggle[aria-expanded="true"] .toc__arrow { transform: rotate(180deg); }

.toc__list {
  display: grid;
  gap: 0.6rem;
  max-height: 0;
  overflow: hidden;
  padding-bottom: 0;
}
.toc__list--open {
  max-height: 1000px;
  padding-bottom: 1.25rem;
}
.toc__list a {
  display: block;
  color: var(--color-text-main);
  font-size: 0.92rem;
  padding-block: 0.15rem;
  transition: color var(--transition-base);
}
.toc__list a:hover { color: var(--color-heading-accent); }