body {
    font-family: Arial, sans-serif;
    background: #f4f6f8;
}

.container {
    max-width: 420px;
    background: #fff;
    padding: 20px;
    margin: 40px auto;
    border-radius: 8px;
    box-shadow: 0 0 10px #ccc;
}

label {
    font-weight: bold;
    display: block;
    margin-top: 10px;
}

input {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
}

.radio-group {
    margin-top: 5px;
}

button {
    margin-top: 15px;
    padding: 10px;
    width: 100%;
    border: none;
    background: #007bff;
    color: white;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}

.preview {
    margin-top: 15px;
    padding: 10px;
    background: #eef;
    display: none;
    white-space: pre-line;
}

@media (max-width: 500px) {
    .container {
        margin: 10px;
    }
}