diff --git a/src/App.tsx b/src/App.tsx
index 08e321e..4784599 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,7 +1,12 @@
+// src/App.tsx
+import { WizardProvider } from './store/context';
+
 export default function App() {
   return (
-    <div className="p-4">
-      <h1 className="text-2xl font-bold">Ready2Blob</h1>
-    </div>
+    <WizardProvider>
+      <div className="p-4">
+        <h1 className="text-2xl font-bold">Ready2Blob</h1>
+      </div>
+    </WizardProvider>
   );
 }
diff --git a/src/store/context.tsx b/src/store/context.tsx
new file mode 100644
index 0000000..db27481
--- /dev/null
+++ b/src/store/context.tsx
@@ -0,0 +1,29 @@
+// src/store/context.tsx
+// WizardContext, WizardProvider, and useWizard hook.
+// useWizard throws if used outside WizardProvider — prevents silent "undefined state" bugs.
+
+import React, { createContext, useContext, useReducer } from 'react';
+import { WizardState, WizardAction, INITIAL_STATE } from './types';
+import { wizardReducer } from './reducer';
+
+interface WizardContextValue {
+  state: WizardState;
+  dispatch: React.Dispatch<WizardAction>;
+}
+
+const WizardContext = createContext<WizardContextValue | null>(null);
+
+export function WizardProvider({ children }: { children: React.ReactNode }) {
+  const [state, dispatch] = useReducer(wizardReducer, INITIAL_STATE);
+  return (
+    <WizardContext.Provider value={{ state, dispatch }}>
+      {children}
+    </WizardContext.Provider>
+  );
+}
+
+export function useWizard(): WizardContextValue {
+  const ctx = useContext(WizardContext);
+  if (!ctx) throw new Error('useWizard must be used inside <WizardProvider>');
+  return ctx;
+}