class CustomHeader extends HTMLElement {
  connectedCallback() {
    this.attachShadow({ mode: 'open' });
    this.shadowRoot.innerHTML = `
      <style>
        :host {
          display: block;
        }
        
        .header {
          background: linear-gradient(90deg, #0f0f23 0%, #1a1a2e 100%);
          border-bottom: 1px solid rgba(218, 165, 32, 0.3);
          padding: 1rem 0;
          box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
        }
        
        .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;
          color: #DAA520;
          text-decoration: none;
        }
        
        .logo-icon {
          margin-right: 12px;
          color: #5B9BD5;
        }
        
        .logo-text {
          font-family: 'Orbitron', sans-serif;
          font-size: 1.8rem;
          font-weight: 700;
          letter-spacing: 2px;
          background: linear-gradient(90deg, #DAA520, #5B9BD5);
          -webkit-background-clip: text;
          -webkit-text-fill-color: transparent;
        }
        
        .nav-links {
          display: flex;
          list-style: none;
        }
        
        .nav-link {
          margin-left: 2rem;
          color: #aaa;
          text-decoration: none;
          font-family: 'Orbitron', sans-serif;
          font-size: 1rem;
          transition: color 0.3s;
          display: flex;
          align-items: center;
        }
        
        .nav-link:hover {
          color: #DAA520;
        }
        
        .nav-link i {
          margin-right: 8px;
        }
        
        @media (max-width: 768px) {
          .container {
            flex-direction: column;
          }
          
          .nav-links {
            margin-top: 1rem;
          }
          
          .nav-link {
            margin: 0 1rem;
          }
        }
      </style>
      
      <header class="header">
        <div class="container">
          <a href="/" class="logo">
            <i data-feather="cpu" class="logo-icon"></i>
            <span class="logo-text">TrekPDF</span>
          </a>
          
          <ul class="nav-links">
            <li><a href="#" class="nav-link"><i data-feather="home"></i> Home</a></li>
            <li><a href="#" class="nav-link"><i data-feather="settings"></i> Settings</a></li>
            <li><a href="#" class="nav-link"><i data-feather="help-circle"></i> Help</a></li>
          </ul>
        </div>
      </header>
    `;
    
    // Initialize Feather Icons after a short delay to ensure DOM is ready
    setTimeout(() => {
      if (typeof feather !== 'undefined') {
        feather.replace();
      }
    }, 100);
  }
}

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