        /* 白色主题样式 */
        :root {
            --primary-color: #5c6bc0;
            --secondary-color: #3949ab;
            --accent-color: #7986cb;
            --text-color: #333333;
            --light-text: #666666;
            --bg-color: #ffffff;
            --card-bg: #f9f9f9;
            --border-color: #e0e0e0;
            --border-radius: 8px;
            --box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
            --box-shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.2s ease;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        body {
            font-family: 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.5;
            color: var(--text-color);
            background-color: var(--bg-color);
            padding: 0;
            margin: 0;
            font-size: 14px;
        }
    
        header {
            background-color: white;
            color: var(--text-color);
            padding: 1rem;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
            border-bottom: 1px solid var(--border-color);
        }
        
        h2 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        main {
            padding: 1.2rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        /* 分类筛选器 */
        .category-filter {
            display: flex;
            gap: 0.5rem;
            overflow-x: auto;
            padding: 0.5rem 0;
            margin-bottom: 1.2rem;
            scrollbar-width: none; /* Firefox */
        }
        
        .category-filter::-webkit-scrollbar {
            display: none; /* Chrome/Safari */
        }
        
        .category-btn {
            padding: 0.5rem 1rem;
            background-color: white;
            color: var(--light-text);
            border: 1px solid var(--border-color);
            border-radius: 20px;
            font-size: 0.85rem;
            white-space: nowrap;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .category-btn:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
        }
        
        .category-btn.active {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        /* 导航栏 */
        .nav-container {
            background-color: white;
            box-shadow: var(--box-shadow);
            border-radius: var(--border-radius);
            padding: 0.6rem;
            margin-bottom: 1.2rem;
            border: 1px solid var(--border-color);
        }
        
        .nav-links {
            display: flex;
            gap: 0.4rem;
            list-style: none;
            flex-wrap: wrap;
        }
        
        .nav-links a {
            display: inline-block;
            padding: 0.5rem 0.8rem;
            background-color: rgba(92, 107, 192, 0.1);
            color: var(--primary-color);
            text-decoration: none;
            border-radius: 6px;
            font-size: 0.85rem;
            font-weight: 500;
            transition: var(--transition);
        }
        
        .nav-links a:hover {
            background-color: rgba(92, 107, 192, 0.2);
        }
        
        /* 搜索区域 */
        .search-container {
            margin: 1rem 0;
        }
        
        .search-container form {
            display: flex;
            flex-direction: column;
            gap: 0.6rem;
        }
        
        .search-container input[type="text"],
        .search-container select {
            padding: 0.6rem 0.8rem;
            border: 1px solid var(--border-color);
            border-radius: var(--border-radius);
            font-size: 0.9rem;
            background-color: white;
            transition: var(--transition);
        }
        
        .search-container input[type="text"]:focus,
        .search-container select:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 2px rgba(121, 134, 203, 0.2);
        }
        
        .search-container button {
            padding: 0.6rem;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .search-container button:hover {
            background-color: var(--secondary-color);
        }
        
        /* 文件列表 */
        .file-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1rem;
        }
        
        .file-item {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            padding: 1.2rem;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
        }
        
        .file-item:hover {
            box-shadow: var(--box-shadow-hover);
            transform: translateY(-3px);
        }
        
        .file-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            margin-bottom: 0.6rem;
        }
        
        .file-header h3 {
            font-size: 1rem;
            font-weight: 600;
            flex: 1;
        }
        
        .category {
            background-color: rgba(92, 107, 192, 0.1);
            color: var(--primary-color);
            padding: 0.2rem 0.6rem;
            border-radius: 12px;
            font-size: 0.7rem;
            margin-left: 0.6rem;
        }
        
        .description {
            color: var(--light-text);
            margin-bottom: 0.8rem;
            font-size: 0.85rem;
            line-height: 1.5;
            flex-grow: 1;
        }
        
        .file-footer {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .file-meta {
            display: flex;
            gap: 0.8rem;
            font-size: 0.78rem;
            color: var(--light-text);
            flex-wrap: wrap;
        }
        
        .file-meta span {
            display: flex;
            align-items: center;
        }
        
        .file-meta span i {
            margin-right: 0.2rem;
            font-size: 0.8rem;
        }
        
        .download-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.5rem 1rem;
            background-color: var(--primary-color);
            color: white;
            text-decoration: none;
            border-radius: var(--border-radius);
            font-size: 0.85rem;
            transition: var(--transition);
            margin-left: auto;
        }
        
        .download-btn:hover {
            background-color: var(--secondary-color);
        }
        
        .no-results {
            text-align: center;
            padding: 2rem;
            color: var(--light-text);
            grid-column: 1 / -1;
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
        }
        
        /* 浮动按钮容器 */
        .float-buttons {
            position: fixed;
            bottom: 1.5rem;
            right: 1rem;
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            z-index: 99;
        }
        
        .float-btn {
            width: 2.8rem;
            height: 2.8rem;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
            transition: var(--transition);
            cursor: pointer;
            position: relative;
        }
        
        .float-btn:hover {
            transform: translateY(-3px) scale(1.1);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }
        
        .float-btn .tooltip {
            position: absolute;
            right: 100%;
            top: 50%;
            transform: translateY(-50%);
            background-color: var(--text-color);
            color: white;
            padding: 0.4rem 0.8rem;
            border-radius: 4px;
            font-size: 0.8rem;
            white-space: nowrap;
            margin-right: 0.8rem;
            opacity: 0;
            pointer-events: none;
            transition: var(--transition);
        }
        
        .float-btn:hover .tooltip {
            opacity: 1;
            margin-right: 1rem;
        }
        
        /* 响应式调整 */
        @media (min-width: 768px) {
            body {
                font-size: 15px;
            }
            
            header {
                padding: 1rem 1.5rem;
            }
            
            h1 {
                font-size: 1.6rem;
            }
            
            .search-container form {
                flex-direction: row;
            }
            
            .search-container input[type="text"] {
                flex: 3;
            }
            
            .search-container select {
                flex: 1;
            }
            
            .search-container button {
                flex: 0 0 100px;
            }
            
            .file-list {
                gap: 1.2rem;
            }
            
            .file-item {
                padding: 1.4rem;
            }
        }
        
        @media (min-width: 992px) {
            .file-list {
                grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            }
        }