diff --git a/src/components/admin/KnowledgeGraph.jsx b/src/components/admin/KnowledgeGraph.jsx
index fd97326..17886a9 100644
--- a/src/components/admin/KnowledgeGraph.jsx
+++ b/src/components/admin/KnowledgeGraph.jsx
@@ -26,6 +26,7 @@ const KnowledgeGraph = () => {
 
   const [topics, setTopics] = useState([]);
   const [relations, setRelations] = useState([]);
+  const [showExcludeNodes, setShowExcludeNodes] = useState(false);
 
   const reloadKb = useCallback(() => {
     Promise.all([db.getTopics(), db.getRelations()]).then(([allTopics, allRelations]) => {
@@ -71,8 +72,15 @@ const KnowledgeGraph = () => {
     const { width, height } = dimensions;
     d3.select(svgRef.current).selectAll('*').remove();
 
-    const nodes = topics.map(d => ({ ...d }));
-    const links = relations.map(d => ({ ...d }));
+    const filteredTopics = showExcludeNodes ? topics : topics.filter(t => t.learning_relevance !== 'exclude');
+    const filteredTopicIds = new Set(filteredTopics.map(t => t.id));
+    const filteredRelations = relations.filter(r => 
+      filteredTopicIds.has(r.source?.id || r.source) && 
+      filteredTopicIds.has(r.target?.id || r.target)
+    );
+
+    const nodes = filteredTopics.map(d => ({ ...d }));
+    const links = filteredRelations.map(d => ({ ...d }));
 
     const svg = d3.select(svgRef.current)
       .attr('viewBox', [0, 0, width, height])
@@ -116,6 +124,12 @@ const KnowledgeGraph = () => {
       .attr('fill', d => color(d.type) || '#1F5560')
       .attr('stroke', '#fff')
       .attr('stroke-width', 2)
+      .attr('stroke-dasharray', d => d.learning_relevance === 'exclude' ? '4,4' : 'none')
+      .attr('opacity', d => {
+        if (d.learning_relevance === 'exclude') return 0.3;
+        if (d.learning_relevance === 'peripheral') return 0.5;
+        return 1;
+      })
       .on('click', (event, d) => {
         setSelectedNode(d);
         setIsEditing(false);
@@ -392,6 +406,15 @@ Analyze this graph and return ONLY the optimized JSON object with this EXACT str
 
       <div className="w-full md:w-80 bg-paper p-6 overflow-y-auto border-t md:border-t-0 border-bg-warm flex flex-col">
         <div className="mb-6 pb-4 border-b border-bg-warm space-y-3">
+          <label className="flex items-center gap-2 text-sm text-fg-muted cursor-pointer mb-3">
+            <input 
+              type="checkbox" 
+              checked={showExcludeNodes} 
+              onChange={e => setShowExcludeNodes(e.target.checked)}
+              className="rounded bg-bg-warm border-transparent focus:ring-0 text-teal"
+            />
+            Show Excluded Nodes (Reference Material)
+          </label>
           <div>
             <Button
               onClick={analyzeGraph}
@@ -486,6 +509,19 @@ Analyze this graph and return ONLY the optimized JSON object with this EXACT str
                   <option value="process">Process</option>
                 </select>
               </div>
+              <div>
+                <label className="text-xs text-fg-muted uppercase tracking-wider mb-1 block">Learning Relevance</label>
+                <select
+                  className="w-full border border-bg-warm rounded-[var(--r-sm)] px-3 py-1.5 text-sm bg-bg"
+                  value={editData.learning_relevance || 'standard'}
+                  onChange={e => setEditData({...editData, learning_relevance: e.target.value})}
+                >
+                  <option value="core">Core</option>
+                  <option value="standard">Standard</option>
+                  <option value="peripheral">Peripheral</option>
+                  <option value="exclude">Exclude</option>
+                </select>
+              </div>
               <div>
                 <label className="text-xs text-fg-muted uppercase tracking-wider mb-1 block">Description</label>
                 <textarea
@@ -506,8 +542,11 @@ Analyze this graph and return ONLY the optimized JSON object with this EXACT str
                 <p className="font-medium">{selectedNode.label}</p>
               </div>
               <div>
-                <p className="text-xs text-fg-muted uppercase tracking-wider mb-1">Type</p>
-                <span className="inline-block px-2 py-1 bg-bg-warm rounded-[var(--r-pill)] text-xs font-mono">{selectedNode.type}</span>
+                <p className="text-xs text-fg-muted uppercase tracking-wider mb-1">Type & Relevance</p>
+                <div className="flex gap-2">
+                  <span className="inline-block px-2 py-1 bg-bg-warm rounded-[var(--r-pill)] text-xs font-mono">{selectedNode.type}</span>
+                  <span className="inline-block px-2 py-1 bg-bg-warm rounded-[var(--r-pill)] text-xs font-mono opacity-80">{selectedNode.learning_relevance || 'standard'}</span>
+                </div>
               </div>
               <div>
                 <p className="text-xs text-fg-muted uppercase tracking-wider mb-1">Description</p>