body {
            margin: 0;
            font-family: Arial, sans-serif;
        }
        header {
            background: #f5f5f5;
            padding: 10px;
            display: flex;
            justify-content: flex-end;
            align-items: center;
            gap: 10px;
            border-bottom: 1px solid #ddd;
        }
        .btn {
            padding: 8px 16px;
            background: #3498db;
            color: #fff;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }
        .logout-btn {
            background: #e74c3c;
        }
        h1 {
            text-align: center;
            margin: 20px 0;
        }
        .container {
            display: flex;
            height: calc(100vh - 60px);
        }
        .left, .right {
            padding: 20px;
            width: 50%;
            box-sizing: border-box;
        }
        .left {
            border-right: 1px solid #ddd;
        }
        h2 {
            margin-top: 0;
        }
        ul {
            list-style: none;
            padding: 0;
        }
        ul li {
            margin-bottom: 8px;
        }
        a {
            color: #3498db;
            text-decoration: none;
        }
        a:hover {
            text-decoration: underline;
        }