body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f8f8f8;
    color: #333;
    margin: 0;
    padding: 0;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-align: center;
}

.container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 1rem;
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.form-control {
    border-radius: 8px;
    border: 1px solid #ccc;
    padding: 0.5rem;
    font-size: 1rem;
}

.btn {
    border-radius: 8px;
    font-size: 1rem;
    padding: 0.5rem 1rem;
}

.btn-primary {
    background-color: #007aff;
    border-color: #007aff;
}

.btn-secondary {
    background-color: #f0f0f5;
    border-color: #f0f0f5;
    color: #007aff;
}

.btn-primary:hover, .btn-primary:focus {
    background-color: #005bb5;
    border-color: #005bb5;
}

.btn-secondary:hover, .btn-secondary:focus {
    background-color: #e0e0eb;
    border-color: #e0e0eb;
}

#result {
    font-size: 1.25rem;
    font-weight: 500;
    text-align: center;
    margin-top: 1rem;
}