{{- /* Real topical relatedness via Hugo's [related] indices (tags/keywords/category).
       Always surfaces blog posts (Section "posts") so reference pages funnel equity
       into the articles. Falls back to recent posts only when nothing matches, so the
       box is never empty. */ -}}
{{- $posts := where .Site.RegularPages "Section" "posts" -}}
{{- $related := where (.Site.RegularPages.Related .) "Section" "posts" -}}
{{- $related = where $related "Permalink" "ne" .Permalink -}}
{{- if lt (len $related) 4 -}}
  {{- $fallback := where $posts "Permalink" "ne" .Permalink -}}
  {{- $related = $related | append $fallback | uniq -}}
{{- end -}}
{{- $related = first 4 $related -}}
{{- if $related -}}
<aside class="related-posts">
  <h3>Related articles</h3>
  <ul>
    {{- range $related }}
    <li><a href="{{ .RelPermalink }}">{{ .Title }}</a></li>
    {{- end }}
  </ul>
</aside>
{{- end -}}