Look: Terminal theme (panr/hugo-theme-terminal v4.2.6), adapted to the museum

Theme vendored unmodified in themes/terminal; base, head, header, footer and post templates
rewritten in its markup; museum components restyled in assets/css/museum.css. Embedded forum
threads follow the same colours.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

themes/terminal/layouts/shortcodes/code.html

@@ -0,0 +1,16 @@
+{{ $id := delimit (shuffle (seq 1 9)) "" }}
+{{ $open := .Get "open" }}
+{{ $lang := .Get "language" }}
+{{ $opts := .Get "opts" }}
+
+{{- if $lang -}}
+  <details class="collapsable-code" {{ if eq $open "true" -}} open {{- end }}>
+    <summary title="Click to interact">
+      {{- if .Get "title" }}<span class="collapsable-code__title">{{ .Get "title" | markdownify }}</span>{{ end -}}
+    </summary>
+    {{ $trInner := trim .Inner "\n" }}
+    {{- transform.Highlight $trInner $lang $opts -}}
+  </details>
+{{ else }}
+  {{ errorf "If you want to use the \"collapsable code\" shortcode, you need to pass a mandatory \"language\" param. The issue occured in %q (%q)" .Page.File .Page.Permalink }}
+{{- end -}}