/* TOC 层级清晰化 */
#card-toc .toc-content > ol > .toc-item > .toc-link {
  font-weight: 700;
  font-size: 0.95em;
  padding-left: 12px;
  border-left: 2px solid var(--theme-color, #49b1f5);
}

#card-toc .toc-content .toc-child .toc-link {
  font-weight: 400;
  font-size: 0.85em;
  padding-left: 24px;
  opacity: 0.85;
}

#card-toc .toc-content .toc-child .toc-child .toc-link {
  font-size: 0.8em;
  padding-left: 36px;
  opacity: 0.7;
}