class CustomHeader extends HTMLElement {
    connectedCallback() {
        this.attachShadow({ mode: 'open' });
        this.shadowRoot.innerHTML = `
            <style>
                header {
                    background-color: white;
                    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
                    position: sticky;
                    top: 0;
                    z-index: 50;
                }
                .header-container {
                    max-width: 100%;
                    margin: 0 auto;
                    padding: 1rem;
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                }
                .logo {
                    display: flex;
                    align-items: center;
                    font-weight: 700;
                    font-size: 1.25rem;
                    color: var(--primary);
                }
                .logo i {
                    margin-right: 0.5rem;
                }
                .nav-links {
                    display: flex;
                    gap: 1.5rem;
                }
                .nav-links a {
                    display: flex;
                    align-items: center;
                    color: #4b5563;
                    font-weight: 500;
                    transition: color 0.2s;
                }
                .nav-links a:hover {
                    color: var(--primary);
                }
                .nav-links i {
                    margin-right: 0.25rem;
                    width: 1rem;
                    height: 1rem;
                }
                .user-menu {
                    display: flex;
                    align-items: center;
                    gap: 1rem;
                }
                .avatar {
                    width: 2.5rem;
                    height: 2.5rem;
                    border-radius: 9999px;
                    background-color: #e5e7eb;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    overflow: hidden;
                }
                @media (max-width: 768px) {
                    .nav-links {
                        display: none;
                    }
                }
            </style>
            <header>
                <div class="header-container">
                    <a href="/" class="logo">
                        <i data-feather="cpu"></i>
                        <span>NetMind Nexus</span>
                    </a>
                    
                    <div class="nav-links">
                        <a href="#">
                            <i data-feather="home"></i>
                            <span>Home</span>
                        </a>
                        <a href="#">
                            <i data-feather="briefcase"></i>
                            <span>Projects</span>
                        </a>
                        <a href="#">
                            <i data-feather="file-text"></i>
                            <span>Docs</span>
                        </a>
                        <a href="#">
                            <i data-feather="settings"></i>
                            <span>Settings</span>
                        </a>
                    </div>
                    <div class="user-menu">
                        <div class="theme-selector relative">
                            <select id="themeSelect" class="appearance-none bg-transparent border border-gray-300 rounded-md px-3 py-1 pr-8 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500">
                                <option value="" disabled>Select Theme</option>
                            </select>
                            <div class="absolute right-2 top-1/2 transform -translate-y-1/2 pointer-events-none">
                                <i data-feather="chevron-down" class="w-4 h-4 text-gray-500"></i>
                            </div>
                        </div>
                        <div class="avatar">
                            <i data-feather="user"></i>
                        </div>
                    </div>
</div>
            </header>
        `;
    }
}
customElements.define('custom-header', CustomHeader);