body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f9f9f9;
        }
        
        h1 {
            color: #2c3e50;
            text-align: center;
            margin-bottom: 20px;
            border-bottom: 2px solid #3498db;
            padding-bottom: 10px;
        }
        
        .calculator-container {
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
            padding: 25px;
            margin-bottom: 20px;
        }
        
        .form-group {
            margin-bottom: 15px;
        }
        
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: 600;
        }
        
        input, select {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
        }
        
        button {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 12px 20px;
            font-size: 16px;
            border-radius: 4px;
            cursor: pointer;
            width: 100%;
            margin-top: 10px;
            transition: background-color 0.3s;
        }
        
        button:hover {
            background-color: #2980b9;
        }
        
        .result-container {
            background-color: #e8f4fc;
            padding: 20px;
            border-radius: 8px;
            margin-top: 20px;
            display: none;
        }
        
        .cost-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
            padding-bottom: 8px;
            border-bottom: 1px solid #d6e9f7;
        }
        
        .total-cost {
            font-size: 22px;
            font-weight: bold;
            color: #e74c3c;
            margin-top: 15px;
            text-align: center;
        }
        
        .note {
            font-size: 14px;
            color: #7f8c8d;
            margin-top: 20px;
            font-style: italic;
        }