/* 自定义样式 */
        :root {
            --primary-color: #2ecc71;
            --secondary-color: #27ae60;
            --accent-color: #1abc9c;
            --text-color: #333333;
            --light-bg: #f5f7fa;
            --dark-bg: #2c3e50;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: var(--text-color);
            scroll-behavior: smooth;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: white;
            transition: all 0.3s ease;
        }
        
        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        
        .btn-secondary {
            background-color: white;
            color: var(--primary-color);
            border: 2px solid var(--primary-color);
            transition: all 0.3s ease;
        }
        
        .btn-secondary:hover {
            background-color: var(--primary-color);
            color: white;
        }
        
        .feature-card {
            transition: all 0.3s ease;
            border-radius: 8px;
            overflow: hidden;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        .sticky-download {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 1000;
            transition: all 0.3s ease;
        }
        
        .sticky-download:hover {
            transform: scale(1.05);
        }
        
        .modal {
            display: none;
            position: fixed;
            z-index: 2000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0, 0, 0, 0.5);
            animation: fadeIn 0.3s ease;
        }
        
        .modal-content {
            background-color: white;
            margin: 15% auto;
            padding: 30px;
            border-radius: 10px;
            width: 80%;
            max-width: 400px;
            text-align: center;
            animation: slideIn 0.3s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        @keyframes slideIn {
            from { transform: translateY(-50px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }
        
        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
            position: absolute;
            top: 15px;
            right: 20px;
        }
        
        .close:hover {
            color: black;
        }
        
        /* 响应式调整 */
        @media (max-width: 768px) {
            .sticky-download {
                bottom: 20px;
                right: 20px;
            }
            
            .modal-content {
                width: 90%;
                margin: 20% auto;
            }
        }
        
        /* 自定义滚动条 */
        ::-webkit-scrollbar {
            width: 8px;
        }
        
        ::-webkit-scrollbar-track {
            background: #f1f1f1;
        }
        
        ::-webkit-scrollbar-thumb {
            background: var(--primary-color);
            border-radius: 4px;
        }
        
        ::-webkit-scrollbar-thumb:hover {
            background: var(--secondary-color);
        }
        
        /* 深色模式 */
        @media (prefers-color-scheme: dark) {
            :root {
                --text-color: #f5f5f5;
                --light-bg: #333333;
                --dark-bg: #1a1a1a;
            }
            
            body {
                background-color: var(--dark-bg);
            }
            
            .bg-white {
                background-color: #2a2a2a !important;
            }
            
            .text-gray-700 {
                color: #e0e0e0 !important;
            }
            
            .border-gray-200 {
                border-color: #444444 !important;
            }
        }