.toc-sidebar {
  position: fixed;
  left: calc(50% + 620px);
  top: 157px;
  min-width: 180px;
  max-width: 300px;
  width: max-content;
}
.toc {
  max-height: calc(100vh - 180px);
  overflow-y: auto;
  padding: 16px;
  background: #fff;
  border-radius: 6px;
  border: 1px solid #e8e8e8;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}
.toc-title {
  font-size: 14px;
  font-weight: 600;
  color: #333;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid #e0e0e0;
}
.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc-item {
  margin: 0;
  padding: 0;
}
.toc-link {
  display: block;
  padding: 6px 0 6px 12px;
  font-size: 14px;
  color: #555;
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all 0.2s;
  line-height: 1.6;
}
.toc-link:hover {
  color: #3498db;
}
.toc-link.active {
  color: #3498db;
  border-left-color: #3498db;
  background: rgba(52, 152, 219, 0.08);
}
@media (max-width: 1400px) {
  .toc-sidebar {
    display: none;
  }
}