* {
    margin: 0;
    padding: 0;
}

.electricity-bill {
    max-width: 400px;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

h2 {
    margin-bottom: 15px;
    text-align: center;
}

#mcb-Amphere, #mcb-AmphereDirect, #calculationMethod {
    width: 100%;
    height: 40px;
    border-radius: 8px;
    border: 2px solid black;
    font-size: 16px;
    padding: 5px;
    background-color: #f8f9fa;
    cursor: pointer;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.error {
    color: red;
    font-size: 14px;
    display: block;
    margin-top: 5px;
}

button {
    background-color: #4CAF50;
    color: white;
    font-size: 16px;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #45a049;
}

.result {
    margin-top: 20px;
    padding: 10px;
    border-radius: 5px;
    background-color: #f8f9fa;
    border: 1px solid #ccc;
}

footer {
    text-align: center;
    font-size: 14px;
    margin-top: 30px;
    padding: 15px 0;
    border-top: 1px solid #eee;
    background-color: #f8f9fa;
}

/* Media Queries for Responsive Design */
@media (max-width: 600px) {
    .electricity-bill {
        max-width: 100%;
        margin: 10px;
        padding: 15px;
    }
    
    button {
        font-size: 16px;
        padding: 8px 12px;
        width: 100%;
    }
    
    .form-group input {
        padding: 6px;
    }
}

@media (min-width: 601px) and (max-width: 1024px) {
    .electricity-bill {
        max-width: 80%;
    }
    
    button {
        font-size: 16px;
    }
}