* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f0f2f5;
            color: #333;
            line-height: 1.6;
            padding: 20px;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            border-radius: 8px;
            box-shadow: 0 0 15px rgba(0,0,0,0.05);
            overflow: hidden;
        }
        
        .header {
            background: linear-gradient(135deg, #e6f2ff 0%, #c9e0ff 100%);
            padding: 5px 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 24px;
            font-weight: bold;
            display: flex;
            align-items: center;
        }
        
        .logo img{
            height:50px;
        }
        
        .logo-ai {
            color: #ff7b00;
        }
        
        .logo-edu {
            color: #1a56db;
        }
        
        .nav a {
            text-decoration: none;
            color: #333;
            font-size: 16px;
            margin-left: 25px;
            transition: color 0.3s;
            font-weight: 500;
        }
        
        .nav a:hover {
            color: #1a56db;
        }
        
        .main-content {
            padding: 20px;
            min-height: 800px;
            display: flex; /* 启用Flex布局 */
            gap: 30px; /* 两栏间距 */
        }
        
        /* 左栏样式 */
        .left-column {
            flex: 3; /* 左栏占比3份 */
        }
        
        /* 右栏样式 */
        .right-column {
            flex: 1; /* 右栏占比1份 */
            background: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            border-left: 1px solid #eee;
            align-self: flex-start; /* 顶部对齐 */
			min-height: 800px;
        }
        
        .sidebar-logo {
            text-align: center;
            margin-bottom: 20px;
            padding-bottom: 20px;
            border-bottom: 1px solid #eaeaea;
        }
        
        .sidebar-logo img {
            max-width: 160px;
            height: auto;
            margin-bottom: 10px;
        }
        
        .sidebar-title {
            font-size: 16px;
            font-weight: bold;
            color: #1a56db;
            margin-top: 10px;
        }
        
        .related-content {
            margin-top: 20px;
        }
        
        .related-content h3 {
            font-size: 18px;
            margin-bottom: 15px;
            color: #222;
            padding-bottom: 8px;
            border-bottom: 2px solid #1a56db;
        }
        
        .related-list {
            list-style: none;
			margin-top: 20px;
			font-size: 15px;
        }
        
        .related-list li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dashed #e0e0e0;
        }
        
        .related-list a {
            text-decoration: none;
            color: #333;
            transition: color 0.2s;
            display: block;
            line-height: 2.3;
            font-size: 14px;
        }
        
        .related-list a:hover {
            color: #1a56db;
        }
        
        .content-title {
            font-size: 20px;
            font-weight: bold;
            margin-bottom: 20px;
            color: #222;
            text-align: center;
            border-bottom: 2px solid #eee;
            padding-bottom: 15px;
        }
        
        .meta-item { 
            display: flex;
            justify-content: center;
            padding: 5px 15px;
            border-radius: 10px;
            background: #eef4f9;
            width: 170px;
            margin: 0 auto 20px;
        }
        
        .book-main-section {
            margin-bottom: 35px;
        }
        .book-main-section img{
			max-width:96%;
            margin-top: 10px;
		}
        .section-title {
            font-size: 22px;
            font-weight: bold;
            color: #1a56db;
            margin-bottom: 20px;
            padding-left: 15px;
            border-left: 5px solid #1a56db;
        }
        
        /* 首行缩进两个字符的样式 */
        .book-main-section p {
            color: #555;
            line-height:2.3;
            text-align: justify;
            margin-bottom: 15px;
            text-indent: 2em; /* 首行缩进两个字符 */
        }
		
		.sidebar-logo {
    position: relative; /* 为圆圈定位提供基准 */
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-bottom: 20px; /* 为底部圆圈预留空间 */
}

.logo-circle {
    position: absolute;
    bottom: -20px;      /* 圆圈底部对齐容器 */
    width: 46px;
    height:46px;
    border-radius: 50%; /* 关键属性：创建圆形 */
    background: linear-gradient(205deg, rgba(52, 152, 219, 0.3) 30%, #96e0cc 70%);
    box-shadow: 0 4px 8px rgba(52, 152, 219, 0.3); /* 立体阴影 */
    z-index: 2;         /* 确保圆圈位于上层 */
    animation: pulse 2s infinite ease-in-out; /* 呼吸动画效果 */
	color:#fff;
	display: flex;
    justify-content: center;
    align-items: center;
}

/* 呼吸动画定义 */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}
        
        @media (max-width: 768px) {
            .header {
                flex-direction: column;
                text-align: center;
                padding: 15px;
            }
            
            .nav {
                margin-top: 15px;
            }
            
            .nav a {
                margin: 0 10px;
            }
            
            .main-content {
                padding: 25px;
                flex-direction: column; /* 移动端改为上下布局 */
            }
            
            .content-title {
                font-size: 28px;
            }
            
            .right-column {
                margin-top: 30px;
            }
        }