/* 悬浮按钮基础样式 */
.float-toc-trigger {
  position: fixed;
  right: 24px;
  bottom: 30px;
  padding: 10px 16px;
  background: #222;
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
  z-index: 999;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
  display: none; /* 默认隐藏，仅指定宽度才出现 */
}
.float-toc-trigger:hover {
  background: #444;
}

/* 悬浮目录弹窗容器 */
.float-toc-panel {
  position: fixed;
  right: 24px;
  bottom: 80px;
  width: 300px;
  max-height: 60vh;
  overflow-y: auto;
  background: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 16px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
  z-index: 998;
  transform: translateY(10px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}
.float-toc-panel.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.float-toc-panel li {
  margin: 8px 0;
  line-height: 1.6;
}
.float-toc-panel a {
  color: #333;
}
.float-toc-panel a:hover {
  color: #007bff;
}

/* ========== 核心媒体查询 ========== */
/* 区间1：窗口宽度769px ~ 1200px （侧边TOC消失，但还不是手机布局） */
@media (min-width:769px) and (max-width:1185px) {
  .float-toc-trigger {
    display: block; /* 显示右下角TOC按钮 */
  }
}
/* 区间2：小于768px 纯手机端，同样保留悬浮按钮 */
@media (max-width:768px) {
  .float-toc-trigger {
    display: block;
  }
}
/* 宽度大于1200px：侧边TOC存在，隐藏悬浮按钮 */
@media (min-width:1201px) {
  .float-toc-trigger {
    display: none;
  }
}