components/header.js

class CustomHeader extends HTMLElement {
    connectedCallback() {
        this.attachShadow({ mode: 'open' });
        this.shadowRoot.innerHTML = `
            <style>
                :host {
                    display: block;
                }
                
                header {
                    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
                    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
                }
                
                .container {
                    max-width: 1200px;
                    margin: 0 auto;
                    padding: 1rem 2rem;
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                }
                
                .logo {
                    display: flex;
                    align-items: center;
                    color: white;
                    text-decoration: none;
                    transition: transform 0.2s;
                }
                
                .logo:hover {
                    transform: translateX(5px);
                }
                
                .logo-text {
                    font-size: 1.5rem;
                    font-weight: bold;
                    margin-left: 0.5rem;
                }
                
                .nav-links {
                    display: flex;
                    gap: 2rem;
                    align-items: center;
                }
                
                .nav-link {
                    color: white;
                    text-decoration: none;
                    transition: opacity 0.2s;
                    display: flex;
                    align-items: center;
                    gap: 0.5rem;
                }
                
                .nav-link:hover {
                    opacity: 0.8;
                }
                
                .dark-mode-toggle {
                    background: rgba(255, 255, 255, 0.2);
                    border: 2px solid white;
                    border-radius: 50px;
                    width: 60px;
                    height: 30px;
                    position: relative;
                    cursor: pointer;
                    transition: background 0.3s;
                }
                
                .dark-mode-toggle::after {
                    content: '☀️';
                    position: absolute;
                    width: 24px;
                    height: 24px;
                    background: white;
                    border-radius: 50%;
                    top: 2px;
                    left: 2px;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    transition: transform 0.3s;
                    font-size: 14px;
                }
                
                .dark-mode-toggle.dark {
                    background: rgba(0, 0, 0, 0.3);
                }
                
                .dark-mode-toggle.dark::after {
                    content: '🌙';
                    transform: translateX(30px);
                }
                
                @media (max-width: 768px) {
                    .container {
                        padding: 1rem;
                    }
                    
                    .nav-links {
                        gap: 1rem;
                    }
                    
                    .nav-text {
                        display: none;
                    }
                }
            </style>
            
            <header>
                <div class="container">
                    <a href="#" class="logo">
                        <span style="font-size: 2rem;">✍️</span>
                        <span class="logo-text">BlogWizard Pro</span>
                    </a>
                    
                    <nav class="nav-links">
                        <a href="#" class="nav-link">
                            <i data-feather="home"></i>
                            <span class="nav-text">Home</span>
                        </a>
                        <a href="#outputSection