/* ==========================
 * TOC 浮动按钮和弹窗样式
 * ========================== */
#toc-float-btn {
  position: fixed !important; /* Ensure it's fixed */
  left: 15px !important; /* Adjusted from 24px */
  top: 15px !important;  /* Adjusted from 24px */
  z-index: 20000 !important; /* Consistent high z-index */
  /* Visual styles (width, height, background, border-radius, box-shadow, icon color/size)
     will be handled by the .tiny-round-btn class added in HTML.
     Remove conflicting properties here. */
  cursor: pointer; /* Keep, though .tiny-round-btn also sets it */
  display: flex; /* Keep, though .tiny-round-btn also sets it */
  align-items: center; /* Keep, though .tiny-round-btn also sets it */
  justify-content: center; /* Keep, though .tiny-round-btn also sets it */
  transition: background 0.2s; /* Keep, .tiny-round-btn has similar */
  /* Remove original:
  width: 48px;
  height: 48px;
  background: #2563eb;
  border-radius: 50%;
  box-shadow: 0 3px 10px rgba(59, 130, 246, 0.25);
  */
}

#toc-float-btn i {
  /* Icon color and font-size will be handled by .tiny-round-btn > i */
  /* Remove original:
  color: #fff;
  font-size: 22px;
  */
}

#toc-popup {
  display: none;
  position: fixed;
  left: 6px;
  top: 80px;
  z-index: 9999;
  width: 220px;
  max-width: 85vw;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  transition: opacity 0.2s, transform 0.2s;
  transform: translateY(-10px);
  opacity: 0;
}

#toc-popup-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid #e2e8f0;
}

#toc-popup-header span {
  font-weight: 600;
  font-size: 0.95em;
  color: #1e293b;
}

#toc-popup-header i {
  margin-right: 8px;
  color: #3b82f6;
}

#toc-popup-close-btn {
  background: transparent;
  border: none;
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 14px;
  color: #475569;
  transition: background 0.15s, color 0.15s;
}

#toc-list {
  list-style: none;
  padding: 8px 0;
  margin: 0;
  font-size: 0.85em;
  max-height: 60vh;
  overflow-y: auto;
}

#toc-list ul.toc-children {
  list-style: none;
  padding-left: 0; /* 移除默认缩进 */
  margin: 0;
  overflow: hidden; /* 确保折叠时内容被隐藏 */
}

/* 添加每级标题的默认缩进和字体样式 */
#toc-list li.toc-h1 {
  margin-top: 6px;
}

#toc-list li.toc-h2 {
  margin-top: 4px;
}

#toc-list li.toc-h3,
#toc-list li.toc-h4,
#toc-list li.toc-h5,
#toc-list li.toc-h6 {
  margin-top: 2px;
}

/* 折叠按钮样式 */
#toc-list .toc-toggle {
  display: inline-block;
  width: 16px;
  height: 16px;
  text-align: center;
  line-height: 16px;
  margin-right: 2px;
  font-size: 10px;
  color: #666;
  transition: transform 0.2s ease;
  cursor: pointer;
}

#toc-list .toc-toggle.collapsed {
  transform: rotate(-90deg);
}

/* 有子项的TOC项样式 */
#toc-list li.has-children > a {
  font-weight: 600;
}

/* 折叠状态下的子项容器 */
#toc-list .toc-children.collapsed {
  height: 0 !important;
  margin: 0;
  padding: 0;
}

/* 修复悬停状态与折叠状态的冲突 */
#toc-list li a:hover .toc-toggle {
  color: #3b82f6;
}

/* 为折叠按钮单独设置悬停样式 */
#toc-list .toc-toggle:hover {
  color: #3b82f6;
  background-color: rgba(59, 130, 246, 0.1);
  border-radius: 3px;
}

/* ==========================
 * TOC 悬浮窗的特定样式
 * ========================== */
/* TOC弹窗滚动条样式 */
#toc-popup::-webkit-scrollbar {
  width: 5px;
}

#toc-popup::-webkit-scrollbar-track {
  background: #f8fafc;
}

#toc-popup::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 3px;
}

#toc-popup::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* TOC列表项通用样式 */
#toc-list li {
  margin-bottom: 0;
  line-height: 1.4;
}

/* 文件名占位符的特殊样式 */
#toc-list li a[href^="#placeholder-"] {
  font-weight: 600;
  color: #2563eb;
  border-left-color: #2563eb;
  background-color: rgba(59, 130, 246, 0.1);
  padding-left: 16px;
}

#toc-list li a[href^="#placeholder-"]::before {
  content: "📄 ";
  margin-right: 4px;
}

#toc-list li a {
  display: block;
  padding: 5px 16px;
  color: #334155;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.15s, color 0.15s, border-left-color 0.15s;
  border-left: 3px dashed #e2e8f0;
  /* 添加多行支持 */
  white-space: normal;
  word-break: break-word;
  line-height: 1.3;
  padding-right: 8px;
}

#toc-list li a:hover {
  background: var(--color-slate-100);
  color: var(--color-slate-900);
  border-left-color: var(--color-slate-400);
}

#toc-list li a.active {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  border-left-color: var(--color-primary-600);
  font-weight: 600;
}

/* 不同层级标题的缩进和字体大小 */
#toc-list li.toc-h2 a {
  padding-left: 16px;
  font-size: 0.95em;
}

#toc-list li.toc-h3 a {
  padding-left: 24px; /* 略微调整缩进 */
  font-size: 0.88em;
  color: #475569;
}

#toc-list li.toc-h3 a:hover {
  color: #3b82f6;
}

/* TOC项中的英文翻译样式 */
#toc-list span.toc-en-translation {
  font-size: 0.85em;
  color: #64748b;
  margin-left: 4px;
  font-weight: 400;
}

/* TOC浮动按钮和关闭按钮的悬停效果 */
#toc-float-btn:hover {
  background: #1d4ed8;
}

#toc-popup-close-btn:hover {
  background: #eef2ff;
  color: #3b82f6;
}