.calculator-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: #272727;
    border-radius: 10px;
    color: #ffffff;
    box-shadow: 0 0 20px rgba(0,0,0,0.2);
}

#calc {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    font-size: 16px;
}

.form-group input,
.form-group select {
    padding: 12px;
    border: 1px solid #444;
    border-radius: 5px;
    background-color: #333;
    color: #ffffff;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    border-color: #c5a47e;
    outline: none;
}

fieldset {
    border: 1px solid #444;
    border-radius: 5px;
    padding: 15px;
    margin: 0;
}

legend {
    font-weight: bold;
    padding: 0 10px;
    color: #ffffff;
    font-size: 16px;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 16px;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin: 0;
}

.btn {
    padding: 14px 28px;
    background-color: #c5a47e;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    font-size: 16px;
    transition: background-color 0.3s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:hover {
    background-color: #b08d6a;
}

#result {
    margin-top: 20px;
    text-align: center;
    font-size: 24px;
    color: #DAA520;
    font-weight: 500;
    padding: 15px;
    border-radius: 5px;
    background-color: rgba(197, 164, 126, 0.1);
}

@media (max-width: 768px) {
    .calculator-container {
        padding: 15px;
        margin: 10px;
    }
    
    .form-group input,
    .form-group select {
        padding: 10px;
    }
    
    .btn {
        padding: 12px 24px;
    }
    
    #result {
        font-size: 20px;
    }
}