diff --git a/.claude/metrics/hooks-metrics.json b/.claude/metrics/hooks-metrics.json
index 5596e328..1b6c67f2 100644
--- a/.claude/metrics/hooks-metrics.json
+++ b/.claude/metrics/hooks-metrics.json
@@ -4423,6 +4423,34 @@
       "file": "/home/theflow/projects/tractatus/public/architecture.html",
       "result": "passed",
       "reason": null
+    },
+    {
+      "hook": "validate-file-edit",
+      "timestamp": "2025-10-19T05:33:42.582Z",
+      "file": "/home/theflow/projects/tractatus/public/architecture.html",
+      "result": "passed",
+      "reason": null
+    },
+    {
+      "hook": "validate-file-edit",
+      "timestamp": "2025-10-19T05:34:01.479Z",
+      "file": "/home/theflow/projects/tractatus/public/architecture.html",
+      "result": "blocked",
+      "reason": "CSP violations in content after edit"
+    },
+    {
+      "hook": "validate-file-edit",
+      "timestamp": "2025-10-19T05:34:19.187Z",
+      "file": "/home/theflow/projects/tractatus/public/architecture.html",
+      "result": "passed",
+      "reason": null
+    },
+    {
+      "hook": "validate-file-edit",
+      "timestamp": "2025-10-19T05:34:38.058Z",
+      "file": "/home/theflow/projects/tractatus/public/js/components/interactive-diagram.js",
+      "result": "passed",
+      "reason": null
     }
   ],
   "blocks": [
@@ -4659,12 +4687,18 @@
       "timestamp": "2025-10-19T03:47:31.242Z",
       "file": "/home/theflow/projects/tractatus/public/architecture.html",
       "reason": "CSP violations in content after edit"
+    },
+    {
+      "hook": "validate-file-edit",
+      "timestamp": "2025-10-19T05:34:01.479Z",
+      "file": "/home/theflow/projects/tractatus/public/architecture.html",
+      "reason": "CSP violations in content after edit"
     }
   ],
   "session_stats": {
-    "total_edit_hooks": 447,
-    "total_edit_blocks": 34,
-    "last_updated": "2025-10-19T05:29:56.732Z",
+    "total_edit_hooks": 451,
+    "total_edit_blocks": 35,
+    "last_updated": "2025-10-19T05:34:38.058Z",
     "total_write_hooks": 185,
     "total_write_blocks": 5
   }
diff --git a/public/architecture.html b/public/architecture.html
index 167c467d..157e1667 100644
--- a/public/architecture.html
+++ b/public/architecture.html
@@ -333,16 +333,16 @@
       <div id="diagram-container" class="relative bg-white rounded-xl shadow-lg p-4 sm:p-6 lg:p-8 border border-gray-200">
         <!-- Flex container for side-by-side layout -->
         <div class="flex flex-col lg:flex-row lg:items-start gap-6">
-          <!-- Interactive SVG (reduced to 25% of original size) -->
+          <!-- Interactive SVG (reduced to 25% surface area = 50% linear) -->
           <div class="flex-shrink-0 flex justify-center lg:justify-start">
             <object
               data="/images/architecture-diagram-interactive.svg"
               type="image/svg+xml"
               id="interactive-svg-object"
-              class="w-24 sm:w-32 lg:w-40 h-auto"
+              class="w-48 sm:w-56 lg:w-64 h-auto"
               aria-label="Interactive Tractatus Architecture Diagram">
               <!-- Fallback for browsers that don't support object tag -->
-              <img src="/images/architecture-diagram-interactive.svg" alt="Tractatus Architecture Diagram" class="w-24 sm:w-32 lg:w-40" />
+              <img src="/images/architecture-diagram-interactive.svg" alt="Tractatus Architecture Diagram" class="w-48 sm:w-56 lg:w-64" />
             </object>
           </div>
 
@@ -521,7 +521,7 @@
   <script src="/js/scroll-animations.js"></script>
 
   <!-- Interactive Architecture Diagram (Phase 3) -->
-  <script src="/js/components/interactive-diagram.js?v=20251019165000"></script>
+  <script src="/js/components/interactive-diagram.js?v=20251019170000"></script>
 
   <!-- Footer Component -->
   <script src="/js/components/footer.js"></script>
diff --git a/public/js/components/interactive-diagram.js b/public/js/components/interactive-diagram.js
index 5ccb675f..f9cf24cf 100644
--- a/public/js/components/interactive-diagram.js
+++ b/public/js/components/interactive-diagram.js
@@ -149,11 +149,18 @@ class InteractiveDiagram {
         console.log('[InteractiveDiagram] Using documentElement as SVG');
       }
 
-      if (!svg || (svg.tagName && svg.tagName.toLowerCase() !== 'svg')) {
+      if (!svg) {
         console.warn('[InteractiveDiagram] SVG diagram not found in contentDocument');
         return;
       }
 
+      // Verify it's actually an SVG element (case-insensitive check)
+      const tagName = svg.tagName ? svg.tagName.toLowerCase() : '';
+      if (tagName !== 'svg') {
+        console.warn('[InteractiveDiagram] Element found but not SVG, tagName:', tagName);
+        return;
+      }
+
       // Store reference to SVG document for later use
       this.svgDoc = svgDoc;
       this.svg = svg;