body {
    font-family: Arial, sans-serif;
    background-color: #f0f8ff;
    color: #333;
    margin: 20px;
}

h1 {
    color: #2e8b57;
    text-align: center;
}

form {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    max-width: 600px;
    margin: 0 auto;
    box-sizing: border-box;
}

p {
    margin: 10px 0;
}

input[type="radio"] {
    margin-right: 10px;
}

button {
    display: block;
    width: 100%;
    padding: 10px 20px;
    font-size: 16px;
    color: #fff;
    background-color: #2e8b57;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 20px;
}

button:hover {
    background-color: #3cb371;
}

#result {
    font-size: 18px;
    font-weight: bold;
    color: #2e8b57;
    text-align: center;
    margin-top: 20px;
}

/* レスポンシブデザイン */
@media (max-width: 600px) {
    body {
        margin: 10px;
    }

    form {
        padding: 10px;
    }

    button {
        font-size: 14px;
        padding: 8px 16px;
    }

    #result {
        font-size: 16px;
    }
}