hugo-paper/layouts/partials/header.html

<header class="header">
  {{ if .IsHome }}
  <h1 class="logo">
    <a class="site-name" href="{{ `` | absURL }}">{{ site.Title }}</a><a class="btn-dark"></a>
  </h1>
  {{ else }}
  <p class="logo">
    <a class="site-name" href="{{ `` | absURL }}">{{ site.Title }}</a><a class="btn-dark"></a>
  </p>
  {{ end }}

  <script>
    let bodyClx = document.body.classList;
    let btnDark = document.querySelector('.btn-dark');
    let sysDark = window.matchMedia('(prefers-color-scheme: dark)');
    let darkVal = localStorage.getItem('dark');

    let setDark = (isDark) => {
      bodyClx[isDark ? 'add' : 'remove']('dark');
      localStorage.setItem('dark', isDark ? 'yes' : 'no');
    };

    setDark(darkVal ? darkVal === 'yes' : sysDark.matches);
    requestAnimationFrame(() => bodyClx.remove('not-ready'));

    btnDark.addEventListener('click', () => setDark(!bodyClx.contains('dark')));
    sysDark.addEventListener('change', (event) => setDark(event.matches));
  </script>

  {{ $url := .RelPermalink }}<!---->
  {{ with site.Menus.main }}
  <nav class="menu">
    {{ range . }}
    <a class="{{ if eq .URL $url }}active{{ end }}" href="{{ .URL }}">{{ .Name }}</a>
    {{ end }}
  </nav>
  {{ end }}<!---->

  {{ with $.Scratch.Get "social-list" }}
  <nav class="social">
    {{ range . }}
    <a
      class="{{ . }}"
      style="--url: url(./{{ . }}.svg)"
      href="https://{{ . }}.com/{{ site.Params.Get . }}"
      target="_blank"
    ></a>
    {{ end }}
  </nav>
  {{ end }}
</header>