drop <main>, use <article role="main"> — bold landmark structure

body direct children: <nav>, <header>, <article role="main">, <footer>
- <nav>: site navigation (own landmark)
- <header>: page identity — title, author, date, metadata
- <article role="main">: content (screen reader gets landmark via role)
- <footer>: site footer

No <main> wrapper. Fewer tags, clearer signal.
Header block defined per-layout (prose gets eyebrow/date, docs gets hgroup).
Content block defined per-layout (docs adds sidebar <nav> + <aside> TOC).

layouts/paper/single.html

@@ -1,59 +1,40 @@
-{{ define "main" }}
-  <main>
-    <article data-paper>
-
-      <header>
-
-        <h1>{{ .Title }}</h1>
-
-        {{- with .Description -}}
-        <p data-abstract>{{ . }}</p>
-        {{- end -}}
-
-        {{/* Byline: date and/or author */}}
-        {{- $hasDate   := not .Date.IsZero -}}
-        {{- $hasAuthor := .Params.author -}}
-        {{- if or $hasDate $hasAuthor -}}
-        <p data-byline>
-          {{- if $hasDate -}}
-          <time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "January 2, 2006" }}</time>
-          {{- end -}}
-          {{- if and $hasDate $hasAuthor -}}
-          <span aria-hidden="true"> · </span>
-          {{- end -}}
-          {{- with .Params.author -}}
-          <span>{{ . }}</span>
-          {{- end -}}
-        </p>
-        {{- end -}}
-
-        {{/* Tags */}}
-        {{- with .GetTerms "tags" -}}
-        <nav data-role="tag-cloud" aria-label="Tags">
-          {{- range . -}}
-          <a href="{{ .Permalink }}" data-tag="{{ .Name }}">{{ .Name }}</a>
-          {{- end -}}
-        </nav>
-        {{- end -}}
-
-      </header>
-
-
-      {{ .Content }}
-
-
-      {{/* ── Prev / Next footer ──────────────────────────────────────── */}}
-      {{- if or .PrevInSection .NextInSection -}}
-      <footer>
-        {{- with .PrevInSection -}}
-        <a href="{{ .RelPermalink }}" rel="prev">← {{ .LinkTitle }}</a>
-        {{- end -}}
-        {{- with .NextInSection -}}
-        <a href="{{ .RelPermalink }}" rel="next">{{ .LinkTitle }} →</a>
-        {{- end -}}
-      </footer>
+{{ define "header" }}
+  <header>
+    <h1>{{ .Title }}</h1>
+    {{ with .Description }}<p data-abstract>{{ . }}</p>{{ end }}
+    {{- $hasDate := not .Date.IsZero -}}
+    {{- $hasAuthor := .Params.author -}}
+    {{- if or $hasDate $hasAuthor -}}
+    <p data-byline>
+      {{- if $hasDate -}}
+      <time datetime="{{ .Date.Format "2006-01-02" }}">{{ .Date.Format "January 2, 2006" }}</time>
       {{- end -}}
-
-    </article>
-  </main>
+      {{- if and $hasDate $hasAuthor }} · {{ end -}}
+      {{- with .Params.author }}{{ . }}{{ end -}}
+    </p>
+    {{- end }}
+    {{- with .GetTerms "tags" }}
+    <nav data-role="tag-cloud" aria-label="Tags">
+      {{- range . }}
+      <a href="{{ .Permalink }}" data-tag="{{ .Name }}">{{ .Name }}</a>
+      {{- end }}
+    </nav>
+    {{- end }}
+  </header>
+{{ end }}
+
+{{ define "content" }}
+  <article role="main">
+    {{ .Content }}
+    {{- if or .PrevInSection .NextInSection }}
+    <footer>
+      {{- with .PrevInSection }}
+      <a href="{{ .RelPermalink }}" rel="prev">← {{ .LinkTitle }}</a>
+      {{- end }}
+      {{- with .NextInSection }}
+      <a href="{{ .RelPermalink }}" rel="next">{{ .LinkTitle }} →</a>
+      {{- end }}
+    </footer>
+    {{- end }}
+  </article>
 {{ end }}