/* 基本設定 */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#text-area {
    text-align: center;
    margin: 10px;
}

#next-button {
    padding: 10px 20px;
    font-size: 1.2em;
}

#streak-display {
    font-size: 1.5em;
    margin-top: 10px;
}

#message-area {
    margin-top: 20px;
    font-size: 2em;
    color: red;
}

#question-area, #answer-area {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin: 20px 0;
}

.question-image, .answer-image {
    margin: 5px;
    width: 100px;
    height: 100px;
    object-fit: contain;
}

.question-image {
    filter: brightness(0) saturate(100%); /* シルエット表示 */
}

.answer-image {
    cursor: pointer;
}

/* レスポンシブ対応 */
@media screen and (max-width: 600px) {
    .question-image, .answer-image {
        width: 80px;
        height: 80px;
    }
}