details {
    border: 1px solid #ccc;
        border-radius: 6px;
        padding: 0.5em;
}
summary {
        border-bottom: 1px solid #aaa;
        cursor: pointer;
        font-weight: bold;
}
@media (prefers-color-scheme: dark) {
    details {
        background-color: #1e2a38; /* 深蓝灰，护眼又有层次 */
        border: 1px solid #444;
    }
    summary {
        font-weight: bold; /*粗体*/
        font-size:20px; /*比一般的大*/
        border-bottom: 1px solid #666;
        color: #e0e0e0;
    }
}