:root {
            --theme-color: #4a90e2;
            --category-bg: #f8f9fa;
            --primary-color: #3498db;
            --secondary-color: #2980b9;
            --accent-color: #e67e22;
            --text-color: #333;
            --light-text: #666;
            --bg-color: #fff;
            --light-bg: #f5f8fa;
            --border-color: #e1e8ed;
            --success-color: #2ecc71;
            --warning-color: #f1c40f;
            --error-color: #e74c3c;
            --border-radius: 6px;
            --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            color: var(--text-color);
            background-color: var(--light-bg);
            min-height: 100vh;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
        }
        a {
            text-decoration: none;
        }
        .fu-container {
            /*max-width: 600px;*/
            padding: 12px 16px;
            flex: 1; /* 让 main 内容区域占据剩余空间 */
        }
        /*.fu-main{*/
        /*    padding:20px;*/
        /*}*/
        
        /* 标题区域 */
        .fu-header {
            position: relative;
            text-align: center;
            padding: 15px 0;
            border-bottom: 1px solid #eee;
        }
        .app-title {
            font-size: 20px;
            font-weight: 500;
            margin: 0;
        }
        .login-status {
            font-size: 14px;
            color: #666;
            display: block;
            margin: 8px auto 0;
            text-align: center;
        }
        .login-status a {
            text-decoration: none;
            color: var(--light-text);
        }

        /* 分类区块 */
        .category-group {
            background: #fff;
            border-radius: 12px;
            padding: 0 16px;
            margin: 16px 0;
            box-shadow: 0 2px 12px rgba(0,0,0,0.04);
        }
        .category-title {
            font-size: 16px;
            font-weight: 600;
            padding: 14px 0;
            border-bottom: 1px solid #eee;
            margin: 0;
        }

        /* 页脚 */
        footer {
            padding: 10px;
            margin-top: 10px;
            text-align: center;
            color: var(--text-color);
            border-top: 1px solid #eee;
        }
        .footer-content {
            /*max-width: 800px;*/
            margin: 0 auto;
            line-height: 1.6;
        }
        .footer-content a {
            color: var(--text-color);
        }

        /* 电脑端优化 */
        @media (min-width: 768px) {
            .fu-container {
                /*max-width: 1024px;*/
                padding: 20px 40px;
            }
            .category-group {
                margin: 30px 0;
            }
            .app-title {
                font-size: 26px;
            }
            footer {
            padding: 10px;
            margin-top: 10px;
            }
            .footer-content {
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
            .footer-content p {
                margin: 5px 0;
            }
        }

        /* 大屏幕优化 */
        @media (min-width: 1200px) {
            .fu-container {
                /*max-width: 1200px;*/
            }
        }