#jp-matching-root {
    font-family: 'Segoe UI', sans-serif;
    text-align: center;
    margin-top: 20px;
    padding: 10px;
}

.button {
    margin: 5px;
    padding: 10px 20px;
    font-size: 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    display: inline-block;
}

.button:hover {
    background-color: #45a049;
}

.button.back {
    background-color: #555;
}

#game-page {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 10px;
    margin: 20px auto;
    max-width: 100%;
}

.card {
    background-color: #f9f9f9;
    padding: 20px;
    cursor: pointer;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    font-size: 18px;
    word-break: break-word;
}

.card.flipped {
    background-color: #cdeccd;
}

#result, #leaderboard {
    margin-top: 20px;
    padding: 10px;
    font-size: 18px;
}

@media screen and (max-width: 600px) {
    .button {
        font-size: 14px;
        padding: 8px 16px;
    }

    .card {
        font-size: 16px;
        padding: 16px;
    }
}