* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft YaHei", sans-serif;
        }
        body {
            background-color: #f5f5f5;
            color: #333;
            line-height: 1.6;
        }
        .container {
            width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        header {
            background-color: #2c3e50;
            color: white;
            padding: 20px 0;
            margin-bottom: 20px;
        }
        .logo {
            font-size: 28px;
            font-weight: bold;
        }
        nav {
            margin-top: 15px;
        }
        nav a {
            color: white;
            text-decoration: none;
            margin-right: 20px;
            font-size: 16px;
        }
        nav a:hover {
            color: #f39c12;
        }
        .section-title {
            font-size: 22px;
            margin: 25px 0 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e74c3c;
            color: #2c3e50;
        }
        .book-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin-bottom: 30px;
        }
        .book-item {
            background-color: white;
            padding: 15px;
            border-radius: 5px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            display: flex;
        }
        .book-cover {
            width: 80px;
            height: 110px;
            background-color: #eee;
            margin-right: 15px;
            flex-shrink: 0;
        }
        .book-info {
            flex-grow: 1;
        }
        .book-title {
            font-size: 18px;
            font-weight: bold;
            margin-bottom: 5px;
            color: #2c3e50;
        }
        .book-title a {
            color: inherit;
            text-decoration: none;
        }
        .book-title a:hover {
            color: #e74c3c;
        }
        .book-author {
            color: #7f8c8d;
            font-size: 14px;
            margin-bottom: 5px;
        }
        .book-desc {
            font-size: 14px;
            color: #555;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        footer {
            background-color: #2c3e50;
            color: white;
            text-align: center;
            padding: 20px 0;
            margin-top: 40px;
        }
        .category-tabs {
            display: flex;
            border-bottom: 1px solid #ddd;
            margin-bottom: 15px;
        }
        .category-tab {
            padding: 8px 20px;
            cursor: pointer;
            background-color: #f1f1f1;
            margin-right: 5px;
            border-radius: 5px 5px 0 0;
        }
        .category-tab.active {
            background-color: #e74c3c;
            color: white;
        }