<header class="topbar">
  <a href="<?= $site->url() ?>" class="wordmark"><?= $site->title()->html() ?></a>
  <button class="menu-btn" aria-label="Open menu">
    <span>Menu</span>
    <span class="menu-btn-lines">
      <span></span><span></span><span></span>
    </span>
  </button>
</header>
