/* 弹窗样式 */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.7);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }
        
        .modal-overlay.active {
            opacity: 1;
            visibility: visible;
        }
        
        .modal {
            background: white;
            border-radius: 15px;
            width: 90%;
            max-width: 400px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            transform: scale(0.8);
            transition: transform 0.4s ease;
            overflow: hidden;
        }
        
        .modal-overlay.active .modal {
            transform: scale(1);
        }
        
        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 25px;
            border-bottom: 1px solid #eee;
        }
        
        .modal-title {
            font-size: 1.5rem;
            font-weight: 600;
            color: #333;
        }
        
        .close-btn {
            background: none;
            border: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: #888;
            transition: color 0.2s;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
        }
        
        .close-btn:hover {
            color: #ff5252;
            background: rgba(255, 82, 82, 0.1);
        }
        
        .modal-body {
            padding: 30px;
            text-align: center;
        }
        
        .qrcode-container {
            display: inline-block;
            padding: 15px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .qrcode {
            width: 200px;
            height: 200px;
            background: #f5f5f5;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #666;
            border: 1px dashed #ddd;
        }
        
        .modal-footer {
            padding: 15px 25px;
            border-top: 1px solid #eee;
            text-align: center;
            color: #777;
            font-size: 0.9rem;
        }
        
        @media (max-width: 480px) {
            .modal {
                width: 95%;
            }
            
            .qrcode {
                width: 180px;
                height: 180px;
            }
            
            h1 {
                font-size: 2rem;
            }
        }