body {
            margin: 0;
            font-family: Arial, sans-serif;
            background-color: #f5f5f5;
            display: flex;
        }

        /* Sidebar */
        .sidebar {
            width: 250px;
            height: 100vh;
            background-color: #ffffff;
            position: fixed;
            left: -250px;
            transition: left 0.3s ease;
            box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
            padding-top: 20px;
        }
        .sidebar.open {
            left: 0;
        }

        /* Sidebar Navigation */
        .nav-menu {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .nav-item {
            width: 100%;
        }

        .nav-link {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: #333;
            padding: 15px 20px;
            font-size: 16px;
            transition: background-color 0.3s, color 0.3s;
        }

        .nav-link i {
            margin-right: 10px;
            font-size: 18px;
        }

        .nav-link:hover, .nav-link.active {
            background-color: #e6f7ff;
            color: #007bff;
        }

        /* Menu Button */
        .menu-icon {
            position: absolute;
            top: 15px;
            left: 15px;
            font-size: 24px;
            cursor: pointer;
            background: none;
            border: none;
        }

        /* Content Area */
        .content {
            margin-left: 0;
            padding: 20px;
            width: 100%;
            transition: margin-left 0.3s ease;
        }
        .content.shift {
            margin-left: 250px;
        }
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
        left: -200px;
    }

    .sidebar.open {
        left: 0;
    }

    .content.shift {
        margin-left: 200px;
    }
}