class CustomHeader extends HTMLElement {
  connectedCallback() {
    this.attachShadow({ mode: 'open' });
    this.shadowRoot.innerHTML = `
      <style>
        :host {
          display: block;
        }
        
        header {
          background: rgba(255, 255, 255, 0.8);
          backdrop-filter: blur(10px);
          border-bottom: 1px solid rgba(0, 0, 0, 0.05);
          padding: 1rem 0;
        }
        
        .dark header {
          background: rgba(15, 15, 15, 0.8);
          border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        
        .container {
          max-width: 1200px;
          margin: 0 auto;
          padding: 0 1rem;
          display: flex;
          justify-content: space-between;
          align-items: center;
        }
        
        .logo {
          font-size: 1.5rem;
          font-weight: 700;
          display: flex;
          align-items: center;
          gap: 0.5rem;
        }
        
        nav ul {
          display: flex;
          list-style: none;
          gap: 1.5rem;
        }
        
        nav a {
          text-decoration: none;
          color: #6b7280;
          font-weight: 500;
          transition: color 0.2s;
          position: relative;
        }
        
        .dark nav a {
          color: #9ca3af;
        }
        
        nav a:hover {
          color: #111827;
        }
        
        .dark nav a:hover {
          color: #f9fafb;
        }
        
        nav a::after {
          content: '';
          position: absolute;
          bottom: -5px;
          left: 0;
          width: 0;
          height: 2px;
          background: #111827;
          transition: width 0.3s;
        }
        
        .dark nav a::after {
          background: #f9fafb;
        }
        
        nav a:hover::after {
          width: 100%;
        }
        
        @media (max-width: 768px) {
          nav ul {
            display: none;
          }
        }
      </style>
      <header>
        <div class="container">
          <div class="logo">
            <span>🏗️</span>
            <span>PromptForge</span>
          </div>
          <nav>
            <ul>
              <li><a href="/">Directory</a></li>
              <li><a href="#">Submit</a></li>
              <li><a href="#">About</a></li>
            </ul>
          </nav>
        </div>
      </header>
    `;
  }
}

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