class CustomHeader extends HTMLElement {
  connectedCallback() {
    this.attachShadow({ mode: 'open' });
    this.shadowRoot.innerHTML = `
      <style>
        :host {
          display: block;
          position: fixed;
          top: 0;
          left: 0;
          right: 0;
          z-index: 50;
          background-color: rgba(17, 24, 39, 0.95);
          backdrop-filter: blur(8px);
          border-bottom: 1px solid rgba(255, 255, 255, 0.1);
          height: 60px;
        }
        header {
          display: flex;
          align-items: center;
          height: 100%;
          padding: 0 1rem;
          max-width: 100%;
        }
        .menu-btn {
          display: flex;
          align-items: center;
          justify-content: center;
          background: transparent;
          border: none;
          color: white;
          cursor: pointer;
          padding: 0.5rem;
          border-radius: 0.375rem;
          margin-right: 1rem;
          transition: all 0.2s;
        }
        .menu-btn:hover {
          background: rgba(255, 255, 255, 0.1);
        }
        .menu-btn i {
          width: 1.25rem;
          height: 1.25rem;
        }
        .title {
          font-size: 1.25rem;
          font-weight: 600;
          color: white;
          display: flex;
          align-items: center;
          gap: 0.5rem;
        }
        .title span {
          color: #8b5cf6;
        }
      </style>
      <header>
        <button class="menu-btn" id="sidebar-toggle">
          <i data-feather="menu"></i>
        </button>
        <div class="title">
          CodeCraft Input Symphony<span>🎹</span>
        </div>
      </header>
    `;

    // Initialize feather icons
    if (window.feather) {
      feather.replace({ class: 'feather', width: 20, height: 20 });
    }
  }
}

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