body {
    margin: 0;
    font-family: sans-serif;
  }
  
  .container {
    display: flex;
    height: 100vh;
  }
  
  .sidebar {
    width: 250px;
    background: #f4f4f4;
    border-right: 1px solid #ccc;
    padding: 1rem;
    overflow-y: auto;
  }
  
  .sidebar ul {
    list-style: none;
    padding-left: 0;
  }
  
  .sidebar .section > span {
    cursor: pointer;
    font-weight: bold;
    display: block;
    margin-top: 1rem;
  }
  
  .sidebar .submenu {
    margin-left: 1rem;
    display: none;
  }
  
  .sidebar .submenu li {
    cursor: pointer;
    padding: 4px 0;
    color: #333;
  }
  
  .sidebar .submenu li:hover {
    text-decoration: underline;
  }
  
  .content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
  }