diff --git a/docs/INTERFACE_PATTERN_MIGRATION.md b/docs/INTERFACE_PATTERN_MIGRATION.md
new file mode 100644
index 0000000..be619a6
--- /dev/null
+++ b/docs/INTERFACE_PATTERN_MIGRATION.md
@@ -0,0 +1,25 @@
+# Docs Interface Pattern Migration
+
+The Docs route composes the platform interface language without owning a
+parallel shell. Core owns its navigation/content pane geometry and page frame;
+Docs owns audience filtering, version selection, topic navigation, configured
+documentation projection, and evidence presentation.
+
+## Surface contract
+
+- `WorkspaceLayout` owns the outline/content regions, pane width, scrolling,
+  accessible labels, and narrow-layout navigation behavior.
+- `PageLayout` owns the content inset, sticky heading, audience-aware page
+  identity, reload action placement, error and loading regions, and responsive
+  action flow.
+- `ExplorerTree`, `SegmentedControl`, `DataGrid`, `DescriptionList`, dialogs,
+  alerts, and status badges retain their Core interaction and accessibility
+  contracts.
+- Docs-specific CSS remains limited to the documentation tree, reading column,
+  topic typography, page outline, and reference content. It no longer defines
+  the outer workspace grid or page skeleton.
+
+The module keeps user/admin audience boundaries, installed-version selection,
+topic URLs, configured-state projection, and evidence visibility unchanged.
+The platform layout checker rejects restoring a raw Docs page or workspace
+frame.
diff --git a/src/govoplan_docs/backend/manifest.py b/src/govoplan_docs/backend/manifest.py
index 2b31a23..4cfbad4 100644
--- a/src/govoplan_docs/backend/manifest.py
+++ b/src/govoplan_docs/backend/manifest.py
@@ -47,6 +47,11 @@ ARCHITECTURE = ModuleArchitectureDeclaration(
             reference="docs/DOCUMENTATION_LAYER_CONCEPT.md",
             summary="Defines the manifest-driven documentation boundary.",
         ),
+        ModuleMaturityEvidence(
+            kind="documentation",
+            reference="docs/INTERFACE_PATTERN_MIGRATION.md",
+            summary="Records the Core-owned Docs workspace and page-layout boundary.",
+        ),
     ),
     known_limits=(
         "Architecture declarations are in staged adoption, so undeclared modules remain visible as pending.",
diff --git a/webui/src/features/docs/DocsPage.tsx b/webui/src/features/docs/DocsPage.tsx
index a9c6184..80db1bf 100644
--- a/webui/src/features/docs/DocsPage.tsx
+++ b/webui/src/features/docs/DocsPage.tsx
@@ -8,10 +8,10 @@ import {
   Dialog,
   DismissibleAlert,
   ExplorerTree,
-  LoadingFrame,
-  PageTitle,
+  PageLayout,
   SegmentedControl,
   StatusBadge,
+  WorkspaceLayout,
   adminErrorMessage,
   useGuardedNavigate,
   usePlatformLanguage,
@@ -133,92 +133,95 @@ export default function DocsPage({ settings }: { settings: ApiSettings }) {
   }, [treeNodes, selectedPage?.id]);
 
   return (
-    <div className="workspace module-workspace docs-workspace">
-      <aside className="section-sidebar docs-outline" aria-label="i18n:govoplan-docs.documentation_outline.6f836b99">
-        <div className="docs-sidebar-header">
-          <div className="section-title">i18n:govoplan-docs.help_center.f3f3a34b</div>
-          <AudienceToggle
-            selected={documentationType}
-            onSelect={selectDocumentationType}
-            canViewAdmin={context?.actor.available_documentation_types.includes("admin") ?? documentationType === "admin"}
-          />
-          <label className="docs-version-selector" title={context?.versions.fallback_policy}>
-            <span>Version</span>
-            <select
-              value={selectedVersion ?? ""}
-              onChange={(event) => selectVersion(event.target.value || null)}
-            >
-              <option value="">Installed versions</option>
-              {selectedVersion && !context?.versions.supported_versions.includes(selectedVersion) &&
-              <option value={selectedVersion}>{selectedVersion} (unsupported)</option>
-              }
-              {(context?.versions.supported_versions ?? []).map((version) => (
-                <option key={version} value={version}>{version}</option>
-              ))}
-            </select>
-          </label>
-        </div>
-        <nav className="docs-tree" aria-label="i18n:govoplan-docs.documentation_outline.6f836b99">
-          <ExplorerTree
-            nodes={treeNodes}
-            getNodeId={(node) => node.id}
-            getNodeLabel={(node) => node.title}
-            getNodeChildren={(node) => node.children}
-            activeId={activeNodeIdForPage(treeNodes, selectedPage?.id ?? "")}
-            expandedIds={expandedNodes}
-            depth={0}
-            childrenBaseClassName="docs-tree-children"
-            nodeContainerClassName="docs-tree-node"
-            nodeWrapBaseClassName="docs-tree-row"
-            toggleBaseClassName="docs-tree-toggle"
-            nodeButtonBaseClassName="docs-tree-page"
-            getNodeWrapStyle={(_node, context) => ({ paddingLeft: `${context.depth * 14}px` })}
-            getNodeButtonClassName={(node) => selectedPage?.id === node.page.id ? "is-active" : ""}
-            renderToggleIcon={(_node, context) => context.hasChildren ? context.expanded ? <ChevronDown size={15} /> : <ChevronRight size={15} /> : <span className="docs-tree-toggle-placeholder" />}
-            renderNodeContent={(node) => node.title}
-            onToggle={(node) => toggleNode(node.id)}
-            onOpen={(node) => selectPage(node.page)}
-          />
-        </nav>
-      </aside>
-      <section className="workspace-content docs-workspace-content">
-        <div className="content-pad workspace-data-page docs-page">
-          <div className="page-heading split workspace-heading">
-            <div>
-              <PageTitle loading={loading}>i18n:govoplan-docs.help_center.f3f3a34b</PageTitle>
-              <p>{adminDocs ? "i18n:govoplan-docs.technical_documentation_for_the_modules_and_conf.267e739e" : "i18n:govoplan-docs.guidance_for_the_functions_available_in_this_ins.723b7cad"}</p>
-            </div>
-            <div className="button-row compact-actions">
-              <Button onClick={() => void load()} disabled={loading}><RefreshCw size={16} /> i18n:govoplan-docs.reload.cce71553</Button>
-            </div>
+    <WorkspaceLayout
+      className="module-workspace docs-workspace"
+      primarySize="wide"
+      primaryLabel="i18n:govoplan-docs.documentation_outline.6f836b99"
+      contentLabel="i18n:govoplan-docs.help_center.f3f3a34b"
+      documentationType={documentationType}
+      contentClassName="docs-workspace-content"
+      primary={(
+        <aside className="section-sidebar docs-outline" aria-label="i18n:govoplan-docs.documentation_outline.6f836b99">
+          <div className="docs-sidebar-header">
+            <div className="section-title">i18n:govoplan-docs.help_center.f3f3a34b</div>
+            <AudienceToggle
+              selected={documentationType}
+              onSelect={selectDocumentationType}
+              canViewAdmin={context?.actor.available_documentation_types.includes("admin") ?? documentationType === "admin"}
+            />
+            <label className="docs-version-selector" title={context?.versions.fallback_policy}>
+              <span>Version</span>
+              <select
+                value={selectedVersion ?? ""}
+                onChange={(event) => selectVersion(event.target.value || null)}
+              >
+                <option value="">Installed versions</option>
+                {selectedVersion && !context?.versions.supported_versions.includes(selectedVersion) &&
+                <option value={selectedVersion}>{selectedVersion} (unsupported)</option>
+                }
+                {(context?.versions.supported_versions ?? []).map((version) => (
+                  <option key={version} value={version}>{version}</option>
+                ))}
+              </select>
+            </label>
           </div>
-
-          {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
-
-          <LoadingFrame loading={loading} label="i18n:govoplan-docs.loading_documentation_context.1c091645">
-            <div className="docs-content">
-              <main className="docs-page-main">
-                <SelectedPageContent
-                  page={selectedPage}
-                  adminDocs={adminDocs}
-                  documentationType={documentationType}
-                  topicById={topicById}
-                  moduleRows={moduleRows}
-                  visibleRoutes={visibleRoutes}
-                  availableRoutes={availableRoutes}
-                  grantedPermissions={grantedPermissions}
-                  evidenceModules={context?.layers.evidence.optional_modules ?? []}
-                  evidenceSources={context?.layers.evidence.sources ?? []}
-                  settings={settings}
-                  locale={locale}
-                />
-              </main>
-              <PageOutline items={outlineItems} />
-            </div>
-          </LoadingFrame>
+          <nav className="docs-tree" aria-label="i18n:govoplan-docs.documentation_outline.6f836b99">
+            <ExplorerTree
+              nodes={treeNodes}
+              getNodeId={(node) => node.id}
+              getNodeLabel={(node) => node.title}
+              getNodeChildren={(node) => node.children}
+              activeId={activeNodeIdForPage(treeNodes, selectedPage?.id ?? "")}
+              expandedIds={expandedNodes}
+              depth={0}
+              childrenBaseClassName="docs-tree-children"
+              nodeContainerClassName="docs-tree-node"
+              nodeWrapBaseClassName="docs-tree-row"
+              toggleBaseClassName="docs-tree-toggle"
+              nodeButtonBaseClassName="docs-tree-page"
+              getNodeWrapStyle={(_node, context) => ({ paddingLeft: `${context.depth * 14}px` })}
+              getNodeButtonClassName={(node) => selectedPage?.id === node.page.id ? "is-active" : ""}
+              renderToggleIcon={(_node, context) => context.hasChildren ? context.expanded ? <ChevronDown size={15} /> : <ChevronRight size={15} /> : <span className="docs-tree-toggle-placeholder" />}
+              renderNodeContent={(node) => node.title}
+              onToggle={(node) => toggleNode(node.id)}
+              onOpen={(node) => selectPage(node.page)}
+            />
+          </nav>
+        </aside>
+      )}
+    >
+      <PageLayout
+        title="i18n:govoplan-docs.help_center.f3f3a34b"
+        description={adminDocs ? "i18n:govoplan-docs.technical_documentation_for_the_modules_and_conf.267e739e" : "i18n:govoplan-docs.guidance_for_the_functions_available_in_this_ins.723b7cad"}
+        actions={<Button onClick={() => void load()} disabled={loading}><RefreshCw size={16} /> i18n:govoplan-docs.reload.cce71553</Button>}
+        loading={loading}
+        loadingLabel="i18n:govoplan-docs.loading_documentation_context.1c091645"
+        error={error}
+        mode="workspace"
+        documentationType={documentationType}
+        className="docs-page"
+      >
+        <div className="docs-content">
+          <main className="docs-page-main">
+            <SelectedPageContent
+              page={selectedPage}
+              adminDocs={adminDocs}
+              documentationType={documentationType}
+              topicById={topicById}
+              moduleRows={moduleRows}
+              visibleRoutes={visibleRoutes}
+              availableRoutes={availableRoutes}
+              grantedPermissions={grantedPermissions}
+              evidenceModules={context?.layers.evidence.optional_modules ?? []}
+              evidenceSources={context?.layers.evidence.sources ?? []}
+              settings={settings}
+              locale={locale}
+            />
+          </main>
+          <PageOutline items={outlineItems} />
         </div>
-      </section>
-    </div>
+      </PageLayout>
+    </WorkspaceLayout>
   );
 
   function selectDocumentationType(type: DocumentationType) {