docs/_includes/header.html

<header class="site-header">
  <div class="header-inner">
    <a href="{{ '/' | relative_url }}" class="site-logo">
      <img src="{{ '/assets/images/solr-logo.svg' | relative_url }}" alt="Apache Solr" height="32">
      <span class="site-name">Orbit Docs</span>
    </a>

    <div class="search-wrap">
      <input type="search" id="search-input" class="search-input"
             placeholder="Search docs…" autocomplete="off" aria-label="Search documentation">
      <div class="search-results" id="search-results" role="listbox"></div>
    </div>

    <div class="header-spacer"></div>

    <nav class="header-links" aria-label="External links">
      <a href="{{ site.solr_url }}" class="header-link" target="_blank" rel="noopener">Apache Solr</a>
      <a href="{{ site.github_url }}" class="header-link" target="_blank" rel="noopener">GitHub</a>
    </nav>

    <button class="mobile-menu-btn" id="mobile-menu-btn"
            aria-label="Toggle navigation" aria-expanded="false" aria-controls="sidebar">&#9776;</button>
  </div>
</header>