* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        

        
        .container {
            width: 90%;
            max-width: 1000px;
            background-color: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            overflow: hidden;
        }
        
        header {
            background: #4a6fc0;
            color: white;
            padding: 20px;
            text-align: center;
        }
        
        h1 {
            font-size: 28px;
            margin-bottom: 5px;
        }
        
        .description {
            font-size: 16px;
            opacity: 0.9;
        }
        
        .control-panel {
            padding: 25px;
            background: #f5f7fc;
            border-bottom: 1px solid #e2e8f0;
        }
        
        .input-group {
            margin-bottom: 20px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2d3748;
        }
        
        input[type="url"], input[type="number"] {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #cbd5e0;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        input[type="url"]:focus, input[type="number"]:focus {
            border-color: #4299e1;
            outline: none;
        }
        
        .button-group {
            display: flex;
            gap: 15px;
        }
        
        button {
            padding: 12px 25px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        #startBtn {
            background: #48bb78;
            color: white;
        }
        
        #startBtn:hover {
            background: #38a169;
        }
        
        #stopBtn {
            background: #f56565;
            color: white;
        }
        
        #stopBtn:hover {
            background: #e53e3e;
        }
        
        #resetBtn {
            background: #4299e1;
            color: white;
        }
        
        #resetBtn:hover {
            background: #3182ce;
        }
        
        .stats-panel {
            display: flex;
            justify-content: space-around;
            padding: 20px;
            background: white;
            border-bottom: 1px solid #e2e8f0;
        }
        
        .stat-box {
            text-align: center;
            padding: 15px;
            background: #edf2f7;
            border-radius: 10px;
            min-width: 150px;
        }
        
        .stat-value {
            font-size: 28px;
            font-weight: 700;
            color: #2d3748;
        }
        
        .stat-label {
            font-size: 14px;
            color: #718096;
            margin-top: 5px;
        }
        
        .preview-container {
            padding: 20px;
            height: 500px;
        }
        
        .preview-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
        }
        
        .preview-title {
            font-size: 18px;
            font-weight: 600;
            color: #2d3748;
        }
        
        .preview-status {
            font-size: 14px;
            color: #718096;
        }
        
        #previewFrame {
            width: 100%;
            height: 100%;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            background: white;
        }
        
        footer {
            text-align: center;
            padding: 15px;
            color: #718096;
            font-size: 14px;
            background: #f5f7fc;
        }
        
        @media (max-width: 768px) {
            .stats-panel {
                flex-direction: column;
                gap: 15px;
            }
            
            .button-group {
                flex-direction: column;
            }
            
            .preview-container {
                height: 400px;
            }
        }