.bmi-calculator-container {
        max-width: 600px;
        margin: 20px auto;
        padding: 25px;
        background-color: #f8f9fa;
        border-radius: 10px;
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        font-family: Arial, sans-serif;
    }
    
    .bmi-calculator-container h2 {
        color: #2c3e50;
        text-align: center;
        margin-bottom: 10px;
    }
    
    .bmi-calculator-container p {
        text-align: center;
        color: #7f8c8d;
        margin-bottom: 20px;
    }
    
    .unit-selector {
        display: flex;
        justify-content: center;
        margin-bottom: 20px;
    }
    
    .unit-selector label {
        margin: 0 15px;
        cursor: pointer;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    .form-group label {
        display: block;
        margin-bottom: 5px;
        font-weight: bold;
        color: #34495e;
    }
    
    .form-group input {
        width: 100%;
        padding: 10px;
        border: 1px solid #ddd;
        border-radius: 5px;
        font-size: 16px;
    }
    
    #calculate-bmi, #reset-calculator {
        display: block;
        width: 100%;
        padding: 12px;
        background-color: #3498db;
        color: white;
        border: none;
        border-radius: 5px;
        font-size: 16px;
        cursor: pointer;
        margin-top: 15px;
        transition: background-color 0.3s;
    }
    
    #calculate-bmi:hover, #reset-calculator:hover {
        background-color: #2980b9;
    }
    
    .bmi-result {
        margin-top: 30px;
        text-align: center;
    }
    
    .bmi-result h3 {
        color: #2c3e50;
        margin-bottom: 15px;
    }
    
    .bmi-value-container {
        font-size: 48px;
        font-weight: bold;
        color: #3498db;
        margin: 20px 0;
    }
    
    .bmi-category {
        font-size: 24px;
        font-weight: bold;
        margin-bottom: 20px;
    }
    
    .bmi-message {
        font-size: 18px;
        line-height: 1.6;
        margin-bottom: 25px;
    }
    
    .bmi-scale {
        display: flex;
        justify-content: space-between;
        margin-bottom: 25px;
    }
    
    .scale-item {
        flex: 1;
        padding: 10px;
        text-align: center;
        color: white;
        font-size: 14px;
    }
    
    .scale-item span {
        display: block;
    }
    
    .underweight { background-color: #3498db; }
    .normal { background-color: #2ecc71; }
    .overweight { background-color: #f39c12; }
    .obese { background-color: #e74c3c; }
    
    @media (max-width: 600px) {
        .bmi-scale {
            flex-direction: column;
        }
        
        .scale-item {
            margin-bottom: 5px;
        }
    }