{{- /* Render $...$ and $$...$$ math to native MathML via Hugo's built-in KaTeX.
       No JavaScript or CDN dependency. */ -}}
{{- $opts := dict "output" "mathml" -}}
{{- if eq .Type "block" -}}
  {{- $opts = merge $opts (dict "displayMode" true) -}}
{{- end -}}
{{- transform.ToMath .Inner $opts -}}