body {
    font-family: 'Noto Sans JP', sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: linear-gradient(to bottom right, #a1c4fd, #c2e9fb);
    margin: 0;
}

.game {
    background-color: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.question {
    font-size: 2em;
    margin-bottom: 20px;
    color: #333;
}

.options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.option {
    padding: 15px;
    font-size: 1.2em;
    border: 2px solid #ccc;
    cursor: pointer;
    border-radius: 10px;
    transition: background-color 0.3s, transform 0.2s;
    background-color: #f9f9f9;
}

.option:hover {
    background-color: #e6f7ff;
    transform: scale(1.05);
}

.correct {
    background-color: #4CAF50;
    color: white;
    border-color: #4CAF50;
}

.incorrect {
    background-color: #f44336;
    color: white;
    border-color: #f44336;
}

.next-button {
    margin-top: 20px;
    padding: 15px 30px;
    font-size: 1.2em;
    border: none;
    border-radius: 30px;
    background-color: #ccc;
    color: white;
    cursor: not-allowed;
    transition: background-color 0.3s;
    display: none;
}

.next-button.enabled {
    background-color: #4CAF50;
    cursor: pointer;
}