diff --git a/src/store/authStore.ts b/src/store/authStore.ts
new file mode 100644
index 0000000..14f3fc1
--- /dev/null
+++ b/src/store/authStore.ts
@@ -0,0 +1,58 @@
+import { create } from "zustand";
+import { persist } from "zustand/middleware";
+import type { AuthState, User } from "@/types";
+
+const DEFAULT_USER: User = {
+  id: "1",
+  name: "Admin",
+  email: "admin@cms.dev",
+  password: "admin123",
+};
+
+export const useAuthStore = create<AuthState>()(
+  persist(
+    (set, get) => ({
+      user: null,
+      isAuthenticated: false,
+
+      login: (email: string, password: string): boolean => {
+        const stored = get().user;
+        const target = stored ?? DEFAULT_USER;
+
+        if (
+          email === target.email &&
+          password === (target.password ?? "admin123")
+        ) {
+          set({
+            user: { ...target, password: target.password ?? "admin123" },
+            isAuthenticated: true,
+          });
+          return true;
+        }
+        return false;
+      },
+
+      logout: () => {
+        set({ isAuthenticated: false });
+      },
+
+      checkAuth: () => {
+        // Handled by persist middleware rehydration
+        // No-op since persist restores state automatically
+      },
+
+      updateUser: (data: Partial<User>) => {
+        set((state) => ({
+          user: state.user ? { ...state.user, ...data } : state.user,
+        }));
+      },
+    }),
+    {
+      name: "cms-auth",
+      partialize: (state) => ({
+        user: state.user,
+        isAuthenticated: state.isAuthenticated,
+      }),
+    }
+  )
+);