.aq h4 {
    cursor: pointer;
    /* 鼠标悬停时显示指针 */
    transition: color 0.2s;
}

.aq h4:hover {
    color: #160cd3;
}

.aq h4::before {
    content: '▶';
    /* 添加展开/收起图标 */
    display: inline-block;
    margin-right: 8px;
    transition: transform 0.3s;
    font-size: 0.8em;
    vertical-align: middle;
}

.aq h4.active::before {
    transform: rotate(90deg);
    /* 展开时旋转图标 */
}

.aq div {
    font-size: 14px;
    margin-bottom: 1.25em;
    line-height: 1.75;
    display: none;
    /* 默认隐藏p内容 */
}

.aq a {
    color: #4F46E5;
    text-decoration: none;
}

.aq a:hover {
    text-decoration: underline;
}

.aq code,
.aq pre {
    display: block;
    font-size: 12px;
    padding: 0;
    margin: 0;
    background: #f0f0f0;
    line-height: 20px;
    /* 行距 */
    background: url(pre-bg.gif) repeat-y left top;
    width: 600px;
    overflow: auto;
    /* 超出宽度出现滑动条 */
    overflow-Y: hidden;
    /* 作用是隐藏IE的右侧滑动条 */
}