.article-toc .article-toc-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  text-align: left;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.article-toc .article-toc-chevron {
  flex-shrink: 0;
  display: flex;
  height: 2rem;
  width: 2rem;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  background: var(--section-muted, #f5f5f5);
  color: var(--foreground, #171717);
  transition: transform 0.3s ease, background-color 0.2s ease;
}

.article-toc.is-collapsed .article-toc-chevron {
  transform: rotate(-90deg);
}

.article-toc-panel {
  display: grid;
  grid-template-rows: 1fr;
  transition: grid-template-rows 0.35s ease, opacity 0.3s ease, margin-top 0.35s ease;
  margin-top: 1rem;
  opacity: 1;
}

.article-toc.is-collapsed .article-toc-panel {
  grid-template-rows: 0fr;
  margin-top: 0;
  opacity: 0;
}

.article-toc-panel > ol {
  overflow: hidden;
}

.article-toc a {
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.article-toc a.is-active {
  color: var(--primary, #2563eb);
  font-weight: 600;
  padding-left: 0.25rem;
}

@media (prefers-reduced-motion: reduce) {
  .article-toc-panel,
  .article-toc .article-toc-chevron,
  .article-toc a {
    transition: none;
  }
}