class HeaderApp extends HTMLElement {
  connectedCallback() {
    this.attachShadow({ mode: 'open' });
    this.shadowRoot.innerHTML = `
      <style>
        :host {
          display: block;
        }
        * {
          margin: 0;
          padding: 0;
          box-sizing: border-box;
        }
        header {
          background-color: white;
          box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
          position: sticky;
          top: 0;
          z-index: 100;
        }
        .container {
          max-width: 1200px;
          margin: 0 auto;
          padding: 0 20px;
        }
        nav {
          display: flex;
          justify-content: space-between;
          align-items: center;
          padding: 20px 0;
        }
        .logo {
          font-size: 1.8rem;
          font-weight: 700;
          color: #ef4444;
          text-decoration: none;
          display: flex;
          align-items: center;
        }
        .logo i {
          margin-right: 10px;
        }
        .nav-links {
          display: flex;
          list-style: none;
        }
        .nav-links li {
          margin-left: 30px;
        }
        .nav-links a {
          text-decoration: none;
          color: #333;
          font-weight: 500;
          transition: color 0.3s;
        }
        .nav-links a:hover {
          color: #ef4444;
        }
        .auth-buttons {
          display: flex;
          align-items: center;
        }
        .btn {
          padding: 10px 20px;
          border-radius: 30px;
          font-weight: 500;
          cursor: pointer;
          transition: all 0.3s;
          text-decoration: none;
          display: inline-block;
          text-align: center;
        }
        .btn-outline {
          border: 2px solid #ef4444;
          color: #ef4444;
          margin-right: 15px;
        }
        .btn-outline:hover {
          background-color: #ef4444;
          color: white;
        }
        .btn-primary {
          background-color: #ef4444;
          color: white;
          border: 2px solid #ef4444;
        }
        .btn-primary:hover {
          background-color: #dc2626;
          border-color: #dc2626;
        }
        .mobile-menu-btn {
          display: none;
          background: none;
          border: none;
          font-size: 1.5rem;
          cursor: pointer;
          color: #333;
        }
        @media (max-width: 768px) {
          .nav-links {
            display: none;
            position: absolute;
            top: 70px;
            left: 0;
            width: 100%;
            background: white;
            flex-direction: column;
            padding: 20px;
            box-shadow: 0 5px 10px rgba(0,0,0,0.1);
          }
          .nav-links.active {
            display: flex;
          }
          .nav-links li {
            margin: 10px 0;
          }
          .auth-buttons {
            display: none;
          }
          .mobile-menu-btn {
            display: block;
          }
        }
      </style>
      <header>
        <div class="container">
          <nav>
            <a href="#" class="logo">
              <i data-feather="gift"></i>
              <span>InviteCraft</span>
            </a>
            <ul class="nav-links">
              <li><a href="#">Home</a></li>
              <li><a href="#templates">Templates</a></li>
              <li><a href="#">Features</a></li>
              <li><a href="#">Pricing</a></li>
              <li><a href="#">Contact</a></li>
            </ul>
            <div class="auth-buttons">
              <a href="#" class="btn btn-outline">Log In</a>
              <a href="#" class="btn btn-primary">Sign Up Free</a>
            </div>
            <button class="mobile-menu-btn">
              <i data-feather="menu"></i>
            </button>
          </nav>
        </div>
      </header>
    `;
    
    // Mobile menu toggle functionality
    setTimeout(() => {
      const mobileMenuBtn = this.shadowRoot.querySelector('.mobile-menu-btn');
      const navLinks = this.shadowRoot.querySelector('.nav-links');
      
      mobileMenuBtn.addEventListener('click', () => {
        navLinks.classList.toggle('active');
        const menuIcon = mobileMenuBtn.querySelector('i');
        if (navLinks.classList.contains('active')) {
          menuIcon.setAttribute('data-feather', 'x');
        } else {
          menuIcon.setAttribute('data-feather', 'menu');
        }
        feather.replace();
      });
    }, 0);
  }
}

customElements.define('header-app', HeaderApp);