* {
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            margin: 0;
            padding: 20px;
            background-color: #f5f7fa;
            color: #333;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
        }
        
        .form-container {
            flex: 1;
            min-width: 300px;
            background-color: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .result-container {
            flex: 1;
            min-width: 300px;
            background-color: #2c3e50;
            color: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        h1 {
            color: #2c3e50;
            margin-top: 0;
            padding-bottom: 10px;
            border-bottom: 2px solid #3498db;
        }
        
        h2 {
            color: #ecf0f1;
            margin-top: 0;
        }
        
        .form-group {
            margin-bottom: 25px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
        }
        
        select, input {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 16px;
            transition: border-color 0.3s;
        }
        
        select:focus, input:focus {
            border-color: #3498db;
            outline: none;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }
        
        .dimension-inputs {
            display: flex;
            gap: 10px;
        }
        
        .dimension-inputs input {
            flex: 1;
        }
        
        .unit {
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0 10px;
            font-weight: bold;
            color: #7f8c8d;
        }
        
        .price-display {
            font-size: 42px;
            font-weight: bold;
            text-align: center;
            margin: 30px 0;
            color: #f1c40f;
        }
        
        .price-breakdown {
            background-color: rgba(255, 255, 255, 0.1);
            padding: 20px;
            border-radius: 8px;
            margin-top: 20px;
        }
        
        .price-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
            padding-bottom: 10px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .price-item:last-child {
            border-bottom: none;
            font-weight: bold;
            font-size: 18px;
            color: #f1c40f;
        }
        
        .area-display {
            font-size: 18px;
            text-align: center;
            background-color: #34495e;
            padding: 15px;
            border-radius: 5px;
            margin-bottom: 20px;
        }
        
        .color-option {
            display: inline-block;
            width: 20px;
            height: 20px;
            border-radius: 3px;
            margin-right: 8px;
            vertical-align: middle;
            border: 1px solid #ddd;
        }
        
        .green { background-color: #2ecc71; }
        .yellow { background-color: #f1c40f; }
        .blue { background-color: #3498db; }
        .red { background-color: #e74c3c; }
        .purple { background-color: #9b59b6; }
        .black { background-color: #2c3e50; }
        
        button {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 15px 30px;
            font-size: 18px;
            border-radius: 5px;
            cursor: pointer;
            width: 100%;
            transition: background-color 0.3s;
            font-weight: bold;
            margin-top: 10px;
        }
        
        button:hover {
            background-color: #2980b9;
        }
        
        .required::after {
            content: " *";
            color: #e74c3c;
        }
        
        .notice {
            font-size: 14px;
            color: #7f8c8d;
            margin-top: 5px;
        }
        
        @media (max-width: 768px) {
            .container {
                flex-direction: column;
            }
            
            .price-display {
                font-size: 36px;
            }
        }