body {
            font-family: sans-serif;
            margin: 0;
            display: flex;
        }
        .sidebar {
            width: 250px;
            background-color: #333;
            color: white;
            padding-top: 20px;
            position: fixed;
            height: 100vh;
            overflow-y: auto;
            transition: width 0.3s ease;
            box-shadow: 2px 0 5px rgba(0,0,0,0.2);
            z-index: 1000;
        }
        .sidebar.collapsed {
            width: 60px;
        }
        .sidebar h2 {
            text-align: center;
            margin-bottom: 20px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .sidebar.collapsed h2 {
            display: none;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar ul li a {
            display: block;
            color: white;
            padding: 10px 20px;
            text-decoration: none;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .sidebar ul li a:hover {
            background-color: #575757;
        }
        .sidebar.collapsed ul li a {
            text-align: center;
            padding: 10px 0;
        }
        .sidebar.collapsed ul li a span {
            display: none;
        }

        .toggle-btn {
            background-color: #555;
            color: white;
            border: none;
            padding: 10px;
            cursor: pointer;
            width: 100%;
            text-align: center;
            position: sticky;
            top: 0;
            z-index: 1001;
        }

        .main-content {
            margin-left: 250px;
            padding: 20px;
            flex-grow: 1;
            transition: margin-left 0.3s ease;
        }
        .main-content.shifted {
            margin-left: 60px;
        }

        header h1 {
            color: #333;
            border-bottom: 2px solid #ccc;
            padding-bottom: 10px;
        }
        .content-section h2 {
            border-bottom: 1px solid #eee;
            padding-bottom: 5px;
            margin-top: 30px;
        }
        ul.bullet-list li {
            margin-bottom: 5px;
        }