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/404.html

@@ -0,0 +1,10 @@
+{{ define "main" }}
+  <div class="post">
+    <h1 class="post-title">404 — {{ $.Site.Params.missingContentMessage | default "Page not found..." }}</h1>
+
+    <div class="post-content">
+      <a href="{{ "/" | absURL }}">{{ $.Site.Params.missingBackButtonLabel | default "Back to home page" }}&nbsp;→</a>
+    </div>
+
+  </div>
+{{ end }}