* {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
    padding: 0;
    background-color: #f0f8ff;
}

h1 {
    font-size: 2em;
    color: #ff6347;
}

#message-area {
    font-size: 1.5em;
    height: 50px; /* 高さを固定 */
    line-height: 50px; /* メッセージを中央揃え */
    overflow: hidden; /* メッセージが長くてもレイアウトが崩れないように */
    margin: 10px 0;
}

#target-area {
    margin: 20px;
}

#target-image {
    width: 100px;
    height: 100px;
}

#game-area {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    max-width: 600px;
    margin: auto;
}

.animal-image {
    width: 80px;
    height: 80px;
    object-fit: contain;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.correct {
    animation: shine 1s infinite alternate;
    transform: scale(1.2);
    border: 3px solid gold;
}

@keyframes shine {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

@media screen and (max-width: 600px) {
    .animal-image {
        width: 60px;
        height: 60px;
    }
}