components/header.js

class CustomHeader extends HTMLElement {
  connectedCallback() {
    this.attachShadow({ mode: 'open' });
    this.shadowRoot.innerHTML = `
      <style>
        :host {
          display: block;
        }
        
        header {
          background-color: rgba(17, 24, 39, 0.8);
          backdrop-filter: blur(10px);
          padding: 1rem 0;
          position: sticky;
          top: 0;
          z-index: 100;
          border-bottom: 1px solid #374151;
        }
        
        .container {
          max-width: 1200px;
          margin: 0 auto;
          padding: 0 1rem;
          display: flex;
          justify-content: space-between;
          align-items: center;
        }
        
        .logo {
          display: flex;
          align-items: center;
          gap: 0.75rem;
          font-weight: 700;
          font-size: 1.5rem;
          color: white;
          text-decoration: none;
        }
        
        .logo-icon {
          background: linear-gradient(45deg, #ef4444, #d946ef);
          width: 40px;
          height: 40px;
          border-radius: 50%;
          display: flex;
          align-items: center;
          justify-content: center;
        }
        
        nav ul {
          display: flex;
          list-style: none;
          gap: 2rem;
        }
        
        nav a {
          color: #9ca3af;
          text-decoration: none;
          font-weight: 500;
          transition: color 0.3s ease;
        }
        
        nav a:hover, nav a.active {
          color: white;
        }
        
        .auth-buttons {
          display: flex;
          gap: 1rem;
        }
        
        .btn {
          padding: 0.5rem 1.5rem;
          border-radius: 9999px;
          font-weight: 500;
          cursor: pointer;
          transition: all 0.3s ease;
        }
        
        .btn-outline {
          border: 1px solid #4b5563;
          background: transparent;
          color: #d1d5db;
        }
        
        .btn-primary {
          background: linear-gradient(45deg, #ef4444, #d946ef);
          color: white;
          border: none;
        }
        
        .btn:hover {
          transform: translateY(-2px);
          box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }
        
        .mobile-menu-btn {
          display: none;
          background: none;
          border: none;
          color: white;
          font-size: 1.5rem;
          cursor: pointer;
        }
        
        @media (max-width: 768px) {
          nav ul {
            display: none;
          }
          
          .auth-buttons {
            display: none;
          }
          
          .mobile-menu-btn {
            display: block;
          }
        }
      </style>
      
      <header>
        <div class="container">
          <a href="/" class="logo">
            <div class="logo-icon">
              <i data-feather="unlock" class="text-white w-5 h-5"></i>
            </div>
            <span>UnlockPro</span>
          </a>
          
          <nav>
            <ul>
              <li><a href="/" class="active">Home</a></li>
              <li><a href="#">Features</a></li>
              <li><a href="#">Devices</a></li>
              <li><a href="#">Support</a></li>
              <li><a href="#">Download</a></li>
            </ul>
          </nav>
          
          <div class="auth-buttons">
            <button class="btn btn-outline">Login</button>
            <button class="btn btn-primary">Get Started</button>
          </div>
          
          <button class="mobile-menu-btn">
            <i data-feather="menu"></i>
          </button>
        </div>
      </header>
    `;
    
    // Initialize feather icons in shadow DOM
    import('https://cdn.jsdelivr.net/npm/feather-icons/dist/feather.min.js').then(() => {
      setTimeout(() => {
        feather.replace({ icons: this.shadowRoot.querySelectorAll('[data-feather]') });
      }, 0);
    });
  }
}

customElements.define('custom-header', CustomHeader);