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: 1000;
        }
        
        .container {
          max-width: 1200px;
          margin: 0 auto;
          padding: 0 1rem;
        }
        
        nav {
          display: flex;
          justify-content: space-between;
          align-items: center;
          padding: 1rem 0;
        }
.logo {
          display: flex;
          align-items: center;
          font-weight: 700;
          font-size: 1.5rem;
          color: #3b82f6;
          text-decoration: none;
        }
        .logo i {
          margin-right: 0.5rem;
        }
        
        .nav-content {
          display: flex;
          align-items: center;
          gap: 1.5rem;
        }
        
        .nav-links {
          display: flex;
          list-style: none;
        }
        
        .nav-links li {
          margin-left: 1.5rem;
        }
        
        .nav-links a {
          text-decoration: none;
          color: #374151;
          font-weight: 500;
          transition: color 0.3s ease;
        }
        
        .nav-links a:hover {
          color: #3b82f6;
        }
        
        .auth-buttons {
          display: flex;
          align-items: center;
          gap: 0.75rem;
        }
        
        .btn {
          padding: 0.5rem 1.25rem;
          border-radius: 9999px;
          font-weight: 500;
          cursor: pointer;
          transition: all 0.3s ease;
          text-decoration: none;
          display: inline-block;
          text-align: center;
          font-size: 0.875rem;
        }
        
        .btn-outline {
          border: 2px solid #3b82f6;
          color: #3b82f6;
          background: transparent;
        }
        .btn-outline:hover {
background: #3b82f6;
          color: white;
        }
        
        .btn-primary {
          background: #3b82f6;
          color: white;
          border: 2px solid #3b82f6;
        }
        
        .btn-primary:hover {
          background: #2563eb;
          border-color: #2563eb;
        }
        
        .user-section {
          display: flex;
          align-items: center;
          gap: 0.75rem;
        }
        
        @media (max-width: 768px) {
          .nav-links {
            display: none;
          }
          
          .auth-buttons {
            display: none;
          }
        }
        
        .btn-outline:hover {