.main-btn {
            z-index: 200;
            background-color: #3498db;
            color: white;
            border: none;
            border-radius: 8px;
            padding: 4px 8px;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
            box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
        }
        
        .main-btn:hover {
            background-color: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(52, 152, 219, 0.4);
        }
        
        /* 弹窗样式 */
        .source-dialog {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            justify-content: center;
            align-items: center;
        }
        
        .dialog-content {
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            width: 90%;
            max-width: 400px;
            padding: 30px;
            text-align: center;
            animation: fadeIn 0.3s ease;
            position: relative;
        }
        
        .close-btn {
            position: absolute;
            top: 15px;
            right: 15px;
            font-size: 24px;
            color: #95a5a6;
            cursor: pointer;
            transition: color 0.2s;
        }
        
        .close-btn:hover {
            color: #e74c3c;
        }
        
        h1 {
            font-size: 24px;
            margin-bottom: 24px;
            color: #2c3e50;
            font-weight: 600;
        }
        
        .source-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        
        .source-btn {
            background-color: white;
            border: 1px solid #e0e3e7;
            border-radius: 8px;
            padding: 14px 20px;
            font-size: 16px;
            color: #2c3e50;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .source-btn:hover {
            background-color: #f8f9fa;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            border-color: #3498db;
            color: #3498db;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .footer {
            margin-top: 30px;
            font-size: 14px;
            color: #95a5a6;
        }