* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", Arial, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    padding: 5px;
}

.container {
    max-width: 1200px;
    min-width: 765px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1 {
    color: #2c3e50;
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 10px;
    border-bottom: 2px solid #3498db;
}

h2 {
    color: #3498db;
    margin: 25px 0 15px;
    padding-left: 10px;
    border-left: 4px solid #3498db;
    scroll-margin-top: 30px; /* 锚点跳转预留顶部间距 */
}

h3 {
    color: #2980b9;
    margin: 20px 0 10px;
    scroll-margin-top: 30px; /* 锚点跳转预留顶部间距 */
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    background: white;
}

table th, table td {
    padding: 12px;
    text-align: left;
    border: 1px solid #ddd;
}

table th {
    background-color: #f2f9ff;
    color: #2c3e50;
}

pre {
    background-color: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 15px;
    margin: 10px 0;
    overflow-x: auto;
    font-family: "Consolas", "Monaco", monospace;
}

code {
    font-family: "Consolas", "Monaco", monospace;
    color: #e74c3c;
    padding: 2px 4px;
    background-color: #f8f9fa;
    border-radius: 2px;
}

.note {
    background-color: #fff8e1;
    border-left: 4px solid #ffc107;
    padding: 10px 15px;
    margin: 15px 0;
}

.example {
    background-color: #f0f8fb;
    border-radius: 4px;
    padding: 20px;
    margin: 15px 0;
}

ul, ol {
    margin: 10px 0 10px 25px;
}

li {
    margin: 5px 0;
}

.section {
    margin-bottom: 20px;
}

img {
    width: 100%;
    object-fit: cover;
}

/* 可折叠目录样式（与之前保持一致） */
.collapse-catalog {
    margin: 0 auto 25px;
    width: 100%;
    background-color: #f2f9ff;
    border-radius: 8px;
    border: 1px solid #d0e6f8;
}

.catalog-header {
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    border-radius: 8px 8px 0 0;
    background-color: #e6f3ff;
}

.catalog-header h2 {
    margin: 0;
    font-size: 18px;
    color: #2c3e50;
    border: none;
    padding: 0;
    border-left: none;
}

.toggle-btn {
    width: 24px;
    height: 24px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #3498db;
    color: white;
    border-radius: 4px;
    font-size: 16px;
    transition: transform 0.3s ease;
}

.catalog-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    padding: 0 20px;
}

/* 目录展开状态样式 */
.catalog-content.expanded {
    max-height: 800px; /* 足够容纳目录内容 */
    padding: 15px 20px;
}

.toggle-btn.rotated {
    transform: rotate(180deg);
}

.catalog {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px; /* 行列间距 */
    margin: 0;
    padding: 0;
}

.catalog > li {
    flex: 1;
    min-width: 200px; /* 最小宽度，避免挤压 */
    margin: 5px 0;
    padding: 0;
}

.catalog > li > a {
    font-size: 16px;
    font-weight: bold;
    color: #2c3e50;
    text-decoration: none;
    display: block;
    padding: 8px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.catalog > li > a:hover {
    background-color: #d0e6f8;
    color: #3498db;
}

.sub-catalog {
    list-style: none;
    margin-left: 20px;
    margin-top: 8px;
    padding-left: 10px;
    border-left: 2px solid #d0e6f8;
}

.sub-catalog > li {
    margin: 6px 0;
    padding: 0;
}

.sub-catalog > li > a {
    font-size: 14px;
    color: #2980b9;
    text-decoration: none;
    display: block;
    padding: 6px 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.sub-catalog > li > a:hover {
    background-color: #e6f3ff;
    color: #1abc9c;
}

/* 新增：返回顶部按钮样式 - 与页面风格统一 */
.back-home {
    display: block;
    width: 140px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    background-color: #fff;
    color: #3498db;
    border: 1px solid #3498db;
    border-radius: 4px;
    text-decoration: none;
    font-size: 1rem;
    margin: 0 auto 1.5rem;
    transition: all 0.3s ease;
}
.back-home:hover {
    background-color: #3498db;
    color: #fff;
}

/* ✅ 新增：面包屑层次导航栏 核心样式 - 完美匹配页面风格 */
.breadcrumb {
    margin: 0 auto 20px;
    padding: 12px 20px;
    background-color: #f8fcff;
    border-radius: 6px;
    border: 1px solid #e5f0fb;
    font-size: 14px;
}
.breadcrumb ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}
.breadcrumb li {
    margin: 0;
    padding: 0;
}
.breadcrumb li a {
    color: #3498db;
    text-decoration: none;
    padding: 2px 6px;
    border-radius: 2px;
    transition: all 0.2s ease;
}
.breadcrumb li a:hover {
    color: #2980b9;
    background-color: #e6f3ff;
}
.breadcrumb li span {
    color: #999;
    margin: 0 6px;
}
.breadcrumb .current {
    color: #2c3e50;
    font-weight: 500;
    padding-left: 6px;
}
.clone-box {
    position: absolute;
    z-index: 999; /* 克隆元素层级高于原元素 */
    margin: 0; /* 清除默认边距，避免偏移 */
    padding: 0;
  }