components/header.js

class CustomHeader 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: 50;
        }
        
        .container {
          max-width: 1200px;
          margin: 0 auto;
          padding: 0 1rem;
          display: flex;
          justify-content: space-between;
          align-items: center;
          height: 80px;
        }
        
        .logo {
          display: flex;
          align-items: center;
          font-weight: 700;
          font-size: 1.5rem;
          color: #4f46e5;
          text-decoration: none;
        }
        
        .logo i {
          margin-right: 0.5rem;
        }
        
        nav ul {
          display: flex;
          list-style: none;
        }
        
        nav ul li {
          margin-left: 2rem;
        }
        
        nav ul li a {
          text-decoration: none;
          color: #374151;
          font-weight: 500;
          transition: color 0.3s ease;
        }
        
        nav ul li a:hover {
          color: #4f46e5;
        }
        
        .mobile-menu-btn {
          display: none;
          background: none;
          border: none;
          font-size: 1.5rem;
          cursor: pointer;
          color: #374151;
        }
        
        @media (max-width: 768px) {
          .nav-links {
            display: none;
          }
          
          .mobile-menu-btn {
            display: block;
          }
          
          nav ul {
            flex-direction: column;
            position: absolute;
            top: 80px;
            left: 0;
            right: 0;
            background: white;
            padding: 1rem;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
          }
          
          nav ul li {
            margin: 0.5rem 0;
          }
          
          .nav-links.active {
            display: block;
          }
        }
      </style>
      
      <header>
        <div class="container">
          <a href="/" class="logo">
            <i data-feather="trending-up"></i>
            <span>DynamicPricing AI</span>
          </a>
          
          <button class="mobile-menu-btn" id="menuBtn">
            <i data-feather="menu"></i>
          </button>
          
          <nav>
            <ul class="nav-links" id="navLinks">
              <li><a href="/">Home</a></li>
              <li><a href="#solutions">Solutions</a></li>
              <li><a href="#contact">Contact</a></li>
              <li><a href="contact.html">Get Started</a></li>
            </ul>
          </nav>
        </div>
      </header>
    `;
    
    // Add event listeners after rendering
    setTimeout(() => {
      const menuBtn = this.shadowRoot.getElementById('menuBtn');
      const navLinks = this.shadowRoot.getElementById('navLinks');
      
      menuBtn.addEventListener('click', () => {
        navLinks.classList.toggle('active');
        const menuIcon = menuBtn.querySelector('i');
        if (navLinks.classList.contains('active')) {
          menuIcon.setAttribute('data-feather', 'x');
        } else {
          menuIcon.setAttribute('data-feather', 'menu');
        }
        feather.replace();
      });
    }, 0);
  }
}

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