body {
    margin: 0;
    font-family: Arial, sans-serif;
}

.container {
    display: flex;
    height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: 200px;
    background-color: #2c3e50;
    color: #ecf0f1;
    padding-top: 20px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar li {
    padding: 10px 20px;
    cursor: pointer;
}

.sidebar li:hover {
    background-color: #34495e;
}

/* 主页面 */
.main-content {
    flex: 1;
    padding: 20px;
    background-color: #ecf0f1;
}

.main-content h2 {
    margin-top: 0;
}

#file-list li {
    margin-bottom: 5px;
}

#file-list li ul li {
    margin-left: 20px; /* 子列表缩进 */
    list-style-type: circle; /* 子项用圆点 */
}