class CustomTopbar extends HTMLElement {
  connectedCallback() {
    this.attachShadow({ mode: 'open' });
    this.shadowRoot.innerHTML = `
      <style>
        header {
          height: 64px;
          background: #ffffff;
          display: flex;
          align-items: center;
          justify-content: space-between;
          padding: 0 1.5rem;
          border-bottom: 1px solid #e5e7eb;
        }
        .search-container {
          position: relative;
          width: 360px;
        }
        .search-input {
          width: 100%;
          padding: 0.5rem 1rem 0.5rem 2.5rem;
          border-radius: 6px;
          border: 1px solid #e5e7eb;
          background: #f9fafb;
          transition: all 0.2s;
        }
        .search-input:focus {
          outline: none;
          background: #ffffff;
          border-color: #3b82f6;
        }
        .search-icon {
          position: absolute;
          left: 1rem;
          top: 50%;
          transform: translateY(-50%);
          color: #9ca3af;
        }
        .user-info {
          display: flex;
          align-items: center;
        }
        .user-avatar {
          width: 36px;
          height: 36px;
          border-radius: 50%;
          margin-right: 0.75rem;
        }
        .user-name {
          margin-right: 1rem;
          font-size: 0.95rem;
          color: #111827;
        }
        .dropdown-icon {
          color: #6b7280;
        }
      </style>
      <header>
        <div class="search-container">
          <i data-feather="search" class="search-icon"></i>
          <input type="text" class="search-input" placeholder="搜索设备ID、车辆ID...">
        </div>
        <div class="user-info">
          <span class="user-name">管理员</span>
          <img src="http://static.photos/people/200x200/100" alt="用户头像" class="user-avatar">
          <i data-feather="chevron-down" class="dropdown-icon"></i>
        </div>
      </header>
    `;
  }
}
customElements.define('custom-topbar', CustomTopbar);