diff --git a/src/lib/PageNotFound.jsx b/src/lib/PageNotFound.jsx
new file mode 100644
index 0000000..cce903d
--- /dev/null
+++ b/src/lib/PageNotFound.jsx
@@ -0,0 +1,75 @@
+import { useLocation } from 'react-router-dom';
+import { base44 } from '@/api/base44Client';
+import { useQuery } from '@tanstack/react-query';
+
+
+export default function PageNotFound({}) {
+    const location = useLocation();
+    const pageName = location.pathname.substring(1);
+
+    const { data: authData, isFetched } = useQuery({
+        queryKey: ['user'],
+        queryFn: async () => {
+            try {
+                const user = await base44.auth.me();
+                return { user, isAuthenticated: true };
+            } catch (error) {
+                return { user: null, isAuthenticated: false };
+            }
+        }
+    });
+    
+    return (
+        <div className="min-h-screen flex items-center justify-center p-6 bg-slate-50">
+            <div className="max-w-md w-full">
+                <div className="text-center space-y-6">
+                    {/* 404 Error Code */}
+                    <div className="space-y-2">
+                        <h1 className="text-7xl font-light text-slate-300">404</h1>
+                        <div className="h-0.5 w-16 bg-slate-200 mx-auto"></div>
+                    </div>
+                    
+                    {/* Main Message */}
+                    <div className="space-y-3">
+                        <h2 className="text-2xl font-medium text-slate-800">
+                            Page Not Found
+                        </h2>
+                        <p className="text-slate-600 leading-relaxed">
+                            The page <span className="font-medium text-slate-700">"{pageName}"</span> could not be found in this application.
+                        </p>
+                    </div>
+                    
+                    {/* Admin Note */}
+                    {isFetched && authData.isAuthenticated && authData.user?.role === 'admin' && (
+                        <div className="mt-8 p-4 bg-slate-100 rounded-lg border border-slate-200">
+                            <div className="flex items-start space-x-3">
+                                <div className="flex-shrink-0 w-5 h-5 rounded-full bg-orange-100 flex items-center justify-center mt-0.5">
+                                    <div className="w-2 h-2 rounded-full bg-orange-400"></div>
+                                </div>
+                                <div className="text-left space-y-1">
+                                    <p className="text-sm font-medium text-slate-700">Admin Note</p>
+                                    <p className="text-sm text-slate-600 leading-relaxed">
+                                        This could mean that the AI hasn't implemented this page yet. Ask it to implement it in the chat.
+                                    </p>
+                                </div>
+                            </div>
+                        </div>
+                    )}
+                    
+                    {/* Action Button */}
+                    <div className="pt-6">
+                        <button 
+                            onClick={() => window.location.href = '/'} 
+                            className="inline-flex items-center px-4 py-2 text-sm font-medium text-slate-700 bg-white border border-slate-200 rounded-lg hover:bg-slate-50 hover:border-slate-300 transition-colors duration-200 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-slate-500"
+                        >
+                            <svg className="w-4 h-4 mr-2" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 12l2-2m0 0l7-7 7 7M5 10v10a1 1 0 001 1h3m10-11l2 2m-2-2v10a1 1 0 01-1 1h-3m-6 0a1 1 0 001-1v-4a1 1 0 011-1h2a1 1 0 011 1v4a1 1 0 001 1m-6 0h6" />
+                            </svg>
+                            Go Home
+                        </button>
+                    </div>
+                </div>
+            </div>
+        </div>
+    )
+}
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