class CustomHeader extends HTMLElement {
    connectedCallback() {
        this.attachShadow({ mode: 'open' });
        this.shadowRoot.innerHTML = `
            <style>
                nav {
                    background-color: white;
                    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
                }
                .nav-link {
                    transition: color 0.2s ease;
                }
                .nav-link:hover {
                    color: #3b82f6;
                }
            </style>
            <nav class="py-4 px-6">
                <div class="container mx-auto flex justify-between items-center">
                    <a href="/" class="text-xl font-bold text-gray-800 flex items-center">
                        <i data-feather="activity" class="mr-2 text-blue-500"></i>
                        DataViz Pro
                    </a>
                    <div class="hidden md:flex space-x-8">
                        <a href="#" class="nav-link text-gray-600">Dashboard</a>
                        <a href="#" class="nav-link text-gray-600">Analytics</a>
                        <a href="#" class="nav-link text-gray-600">Reports</a>
                        <a href="#" class="nav-link text-gray-600">Settings</a>
                    </div>
                    <button class="md:hidden">
                        <i data-feather="menu" class="text-gray-600"></i>
                    </button>
                </div>
            </nav>
        `;
    }
}
customElements.define('custom-header', CustomHeader);