#sidebar {
    position: fixed;
    top: 150px;
    left: 20px;
    width: 250px;
    background-color: #f8f9fa;
    display: none;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

#sidebar h2 {
    margin-bottom: 20px;
    font-size: 16px;
    color: #333;
    border-bottom: #5f676f solid 1px;
}

#toc {
    list-style: none;
    padding-left: 0;
}

#toc li {
    margin: 8px 0;
}

#toc li a {
    text-decoration: none;
    color: #333;
    font-size: 14px;
    transition: color 0.3s ease;
}

#toc li a:hover {
    color: #007bff;
}

#toc li.active a {
    font-weight: bold;
    color: #007bff;
}

/* 样式根据不同级别的标题进行缩进 */
#toc .level-1 {
    margin-left: 0;
}

#toc .level-2 {
    margin-left: 20px;
}

#toc .level-3 {
    margin-left: 40px;
}