body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f0f2f5;
}

.calculator-container {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

h1 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    text-align: center;
}

.input-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: #34495e;
    font-weight: 500;
}

input {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

input:focus {
    outline: none;
    border-color: #3498db;
}

button {
    width: 100%;
    padding: 1rem;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #2980b9;
}

.result-container {
    margin-top: 2rem;
    text-align: center;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 6px;
}

#monthly-payment {
    font-size: 2rem;
    font-weight: bold;
    color: #27ae60;
    margin-top: 0.5rem;
}

@media (max-width: 480px) {
    .calculator-container {
        margin: 1rem;
        padding: 1.5rem;
    }
}