* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background-color: #1a5f7a;
            color: white;
            padding: 20px 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .logo i {
            font-size: 2.5rem;
            color: #57cc99;
        }
        
        .logo-text h1 {
            font-size: 1.8rem;
            margin-bottom: 5px;
        }
        
        .logo-text p {
            font-size: 0.9rem;
            opacity: 0.9;
        }
        
        .nav-menu {
            display: flex;
            gap: 25px;
            list-style: none;
        }
        
        .nav-menu a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 8px 0;
            position: relative;
            transition: color 0.3s;
        }
        
        .nav-menu a:hover, .nav-menu a.active {
            color: #57cc99;
        }
        
        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: #57cc99;
            border-radius: 2px;
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* 主要内容区 */
        .main-content {
            padding: 40px 0;
            min-height: calc(100vh - 300px);
        }
        
        .page-title {
            display: flex;
            align-items: center;
            margin-bottom: 30px;
            color: #1a5f7a;
            padding-bottom: 15px;
            border-bottom: 1px solid #e0e0e0;
        }
        
        .page-title i {
            margin-right: 15px;
            font-size: 1.8rem;
        }
        
        .page-title h2 {
            font-size: 1.8rem;
        }

/* 年鉴详情样式 */
.yearbook-detail {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    margin-bottom: 40px;
}

.yearbook-header {
    display: flex;
    padding: 10px;
    background: linear-gradient(135deg, #f8fafc 0%, #e8f1f5 100%);
    border-bottom: 1px solid #e0e6ef;
}

/* 左侧封皮图片区域 */
.yearbook-cover {
    flex: 0 0 220px;
    margin-right: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cover-image {
    width: 100%;
    height: 280px;
    background-color: #f0f7fb;
    border-radius: 8px;
    margin-bottom: 15px;
    box-shadow: 0 5px 15px rgba(26, 95, 122, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px dashed #c2d8e6;
    overflow: hidden;
}

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

.cover-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #7a9eb5;
    text-align: center;
    padding: 20px;
}

    .cover-placeholder i {
        font-size: 3.5rem;
        margin-bottom: 15px;
        color: #a3c4db;
    }

    .cover-placeholder h3 {
        font-size: 1.2rem;
        font-weight: 600;
        margin-bottom: 5px;
        color: #1a5f7a;
    }

    .cover-placeholder p {
        font-size: 0.9rem;
        opacity: 0.9;
    }

.cover-actions {
    width: 100%;
}

.btn {
    width: 100%;
    padding: 12px 15px;
    border: none;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.3s;
}

.btn-primary {
    background-color: #1a5f7a;
    color: white;
}

    .btn-primary:hover {
        background-color: #144b61;
        transform: translateY(-2px);
        box-shadow: 0 4px 8px rgba(26, 95, 122, 0.3);
    }

/* 右侧元数据区域 */
.yearbook-title-section {
    flex: 1;
}

    .yearbook-title-section h1 {
        font-size: 2rem;
        color: #1a5f7a;
        margin-bottom: 20px;
    }

.yearbook-meta {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-width: 400px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 10px 15px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border-left: 4px solid #1a5f7a;
}

    .meta-item i {
        color: #1a5f7a;
        font-size: 1.2rem;
        width: 24px;
        text-align: center;
    }

    .meta-item span {
        font-size: 1rem;
        font-weight: 500;
    }
      
        
        /* 内容区域 */
        .yearbook-content {
            margin-top: 10px;
        }
        
        .content-section {
            margin-bottom: 40px;
        }
        
        .content-section h3 {
            color: #1a5f7a;
            margin-bottom: 20px;
            font-size: 1.5rem;
            display: flex;
            align-items: center;
            gap: 10px;
            padding-bottom: 10px;
            border-bottom: 1px solid #eaeaea;
        }
        
        .content-section h3 i {
            color: #57cc99;
        }
        
        .content-section p {
            margin-bottom: 15px;
            line-height: 1.7;
            color: #555;
        }
        
        /* 目录样式 - 双列优化版 */
        .toc-container {
            margin-top: 20px;
        }
        
        /* 双列布局 */
        .toc-two-columns {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        
        .toc-section {
            background-color: #f8f9fa;
            padding: 25px;
            border-radius: 8px;
            border-left: 4px solid #1a5f7a;
            margin-bottom: 25px;
        }
        
        .toc-section h4 {
            color: #1a5f7a;
            margin-bottom: 18px;
            padding-bottom: 8px;
            border-bottom: 1px solid #e0e0e0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
        }
        
        .toc-section h4 i {
            margin-right: 10px;
            color: #57cc99;
        }
        
        .toc-list {
            list-style-type: none;
            display: grid;
            grid-template-columns: 1fr;
            gap: 0;
        }
        
        .toc-item {
            padding: 10px 12px;
            border-bottom: 1px dashed #e0e0e0;
            font-size: 0.95rem;
            color: #444;
            display: flex;
            align-items: flex-start;
            transition: all 0.2s;
        }
        
        .toc-item:last-child {
            border-bottom: none;
        }
        
        .toc-item:hover {
            background-color: #f0f7ff;
            border-radius: 4px;
            transform: translateX(3px);
        }
        
        .toc-item-number {
            color: #57cc99;
            font-weight: bold;
            margin-right: 12px;
            min-width: 45px;
        }
        
        .toc-item-link {
            color: #333;
            text-decoration: none;
            flex: 1;
        }
        
        .toc-item-link:hover {
            color: #1a5f7a;
            text-decoration: underline;
        }
        
        /* 相关年鉴 */
        .related-yearbooks {
            background-color: white;
            border-radius: 8px;
            padding: 25px;
            box-shadow: 0 3px 15px rgba(0, 0, 0, 0.08);
            margin-top: 40px;
        }
        
        .related-title {
            color: #1a5f7a;
            margin-bottom: 20px;
            font-size: 1.5rem;
        }
        
        .related-list {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .related-item {
            background-color: #f8f9fa;
            padding: 12px 20px;
            border-radius: 5px;
            border: 1px solid #e0e0e0;
            transition: all 0.3s;
        }
        
        .related-item:hover {
            background-color: #e6f7ee;
            border-color: #57cc99;
        }
        
        .related-item a {
            color: #333;
            text-decoration: none;
            display: block;
        }
        
        .related-item a:hover {
            color: #1a5f7a;
        }
        
        /* 页脚样式 */
        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 30px;
        }
        
        .footer-section h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: #57cc99;
        }
        
        .footer-section p, .footer-section a {
            color: #bdc3c7;
            margin-bottom: 10px;
            display: block;
            text-decoration: none;
        }
        
        .footer-section a:hover {
            color: #57cc99;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        
        /* 移动端适配 */
        @media (max-width: 992px) {
            .toc-two-columns {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .logo {
                margin-bottom: 20px;
            }
            
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                gap: 0;
                margin-top: 15px;
            }
            
            .nav-menu.show {
                display: flex;
            }
            
            .nav-menu li {
                width: 100%;
            }
            
            .nav-menu a {
                display: block;
                padding: 12px 0;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }
            
            .mobile-menu-btn {
                display: block;
                position: absolute;
                top: 25px;
                right: 20px;
            }
            
            .yearbook-header {
                flex-direction: column;
            }
            
            .yearbook-title-section h1 {
                font-size: 1.6rem;
            }
            
            .yearbook-detail {
                padding: 20px;
            }
            
            .page-title h2 {
                font-size: 1.5rem;
            }
            
            .toc-section {
                padding: 20px;
            }
        }
        
        @media (max-width: 480px) {
            .yearbook-meta {
                flex-direction: column;
                gap: 10px;
            }
            
            .related-list {
                flex-direction: column;
            }
            
            .footer-content {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            
            .toc-item-number {
                min-width: 40px;
            }
        }
        
        /* SEO优化相关样式 */
        .breadcrumb {
            margin-bottom: 20px;
            font-size: 0.9rem;
            color: #666;
        }
        
        .breadcrumb a {
            color: #1a5f7a;
            text-decoration: none;
        }
        
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        
        .breadcrumb span {
            margin: 0 8px;
        }
        
        /* 目录导航样式 */
        .toc-nav {
            background-color: #f0f7ff;
            padding: 15px 20px;
            border-radius: 8px;
            margin-bottom: 25px;
            border-left: 4px solid #57cc99;
        }
        
        .toc-nav h4 {
            color: #1a5f7a;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }
        
        .toc-nav-links {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        
        .toc-nav-link {
            background-color: white;
            padding: 6px 12px;
            border-radius: 4px;
            color: #1a5f7a;
            text-decoration: none;
            font-size: 0.9rem;
            border: 1px solid #d0e4ff;
            transition: all 0.2s;
        }
        
        .toc-nav-link:hover {
            background-color: #e6f7ee;
            border-color: #57cc99;
        }

/* 下载区域样式 */
.download-section {
    background-color: white;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.08);
    margin-top: 30px;
    text-align: center;
}

    .download-section h3 {
        color: #1a5f7a;
        margin-bottom: 20px;
        font-size: 1.5rem;
    }

.download-options {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 25px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: #1a5f7a;
    color: white;
    padding: 15px 30px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

    .download-btn:hover {
        background-color: #144a60;
    }

    .download-btn.large {
        padding: 18px 35px;
        font-size: 1.1rem;
    }

    .download-btn.secondary {
        background-color: #57cc99;
    }

        .download-btn.secondary:hover {
            background-color: #3eb489;
        }

.download-note {
    color: #666;
    font-size: 0.9rem;
    margin-top: 15px;
}