.problem {
    margin-bottom: 30px;
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin-inline: auto;
}

.output {
    padding: 10px;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 4px;
    white-space: pre-wrap; /* 改行を保持して表示 */
    font-family: monospace;
}

.result {
    margin-top: 10px;
    padding: 10px;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.result h4 {
    margin: 5px 0;
    font-size: 1.1em;
}

.result pre {
    margin: 5px 0;
    font-size: 1em;
    background-color: #f0f0f0;
    padding: 10px;
    border-radius: 4px;
    white-space: pre-wrap;
    word-wrap: break-word;
}

textarea { width: 100%; height: 150px; margin-bottom: 10px; }
pre { background: #f4f4f4; padding: 10px; border: 1px solid #ddd; }
.correct { color: green; font-weight: bold; }
.incorrect { color: red; font-weight: bold; }
.code-output p { margin-bottom: 0px; }

@media screen and (min-width: 779px) {
    .problem {
        padding: 20px;
    }

    .problem > h2,
    .problem > p {
        width: 100%;
    }

    .code-twin-result-container {
        display: flex;
        gap: 20px;
        width: 100%;
    }

    .code-twin {
        display: flex;
        flex-direction: column;
        width: 60%;
    }

    .code-input, 
    .code-output {
        width: 100%;
    }

    .result {
        width: 40%;
        margin-top: 0px;
    }

    .output {
        height: 300px;
        margin-top: 0px;
        padding: 10px;
        overflow-y: auto;
    }
}