diff --git a/app/(tabs)/_layout.tsx b/app/(tabs)/_layout.tsx
index e69de29..93f0b5b 100644
--- a/app/(tabs)/_layout.tsx
+++ b/app/(tabs)/_layout.tsx
@@ -0,0 +1,53 @@
+import { Tabs } from "expo-router";
+import { Ionicons } from "@expo/vector-icons";
+import { Button, Alert } from "react-native";
+import AsyncStorage from "@react-native-async-storage/async-storage";
+import { useRouter } from "expo-router";
+
+export default function TabsLayout() {
+  const router = useRouter();
+
+  const handleLogout = async () => {
+    Alert.alert("Đăng xuất", "Bạn có chắc muốn đăng xuất?", [
+      {
+        text: "Hủy",
+        style: "cancel",
+      },
+      {
+        text: "Đăng xuất",
+        style: "destructive",
+        onPress: async () => {
+          await AsyncStorage.removeItem("authToken");
+          router.replace("/"); // quay về màn hình đăng nhập
+        },
+      },
+    ]);
+  };
+
+  return (
+    <Tabs screenOptions={{ headerShown: true, tabBarActiveTintColor: "#007AFF" }}>
+      <Tabs.Screen
+        name="home"
+        options={{
+          title: "Trang chủ",
+          tabBarIcon: ({ color, size }) => <Ionicons name="home" color={color} size={size} />,
+        }}
+      />
+      <Tabs.Screen
+        name="products"
+        options={{
+          title: "Sản phẩm",
+          tabBarIcon: ({ color, size }) => <Ionicons name="pricetags" color={color} size={size} />,
+        }}
+      />
+      <Tabs.Screen
+        name="account"
+        options={{
+          title: "Tài khoản",
+          tabBarIcon: ({ color, size }) => <Ionicons name="person" color={color} size={size} />,
+          headerRight: () => <Button title="Logout" onPress={handleLogout} color="#FF3B30" />,
+        }}
+      />
+    </Tabs>
+  );
+}
diff --git a/app/(tabs)/account.tsx b/app/(tabs)/account.tsx
index e69de29..5d1ad1e 100644
--- a/app/(tabs)/account.tsx
+++ b/app/(tabs)/account.tsx
@@ -0,0 +1,9 @@
+import { View, Text } from "react-native";
+
+export default function HomeScreen() {
+  return (
+    <View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
+      <Text>Chào mừng đến Tài khoản!</Text>
+    </View>
+  );
+}
diff --git a/app/(tabs)/home.tsx b/app/(tabs)/home.tsx
new file mode 100644
index 0000000..8d14b13
--- /dev/null
+++ b/app/(tabs)/home.tsx
@@ -0,0 +1,9 @@
+import { View, Text } from "react-native";
+
+export default function HomeScreen() {
+  return (
+    <View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
+      <Text>Chào mừng đến Trang chủ!</Text>
+    </View>
+  );
+}
diff --git a/app/(tabs)/index.tsx b/app/(tabs)/index.tsx
deleted file mode 100644
index e69de29..0000000
diff --git a/app/(tabs)/products.tsx b/app/(tabs)/products.tsx
index e69de29..55fd12a 100644
--- a/app/(tabs)/products.tsx
+++ b/app/(tabs)/products.tsx
@@ -0,0 +1,9 @@
+import { View, Text } from "react-native";
+
+export default function HomeScreen() {
+  return (
+    <View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
+      <Text>Chào mừng đến Sản phẩm!</Text>
+    </View>
+  );
+}
diff --git a/app/_layout.tsx b/app/_layout.tsx
index e69de29..006f56b 100644
--- a/app/_layout.tsx
+++ b/app/_layout.tsx
@@ -0,0 +1,27 @@
+import { Stack, router } from "expo-router";
+import { useEffect, useState } from "react";
+import AsyncStorage from "@react-native-async-storage/async-storage";
+
+export default function RootLayout() {
+  const [isLoading, setIsLoading] = useState(true);
+  const [isLoggedIn, setIsLoggedIn] = useState(false);
+
+  useEffect(() => {
+    const checkAuth = async () => {
+      const token = await AsyncStorage.getItem("authToken");
+      setIsLoggedIn(!!token);
+      setIsLoading(false);
+    };
+    checkAuth();
+  }, []);
+
+  if (isLoading) return null;
+
+  return (
+    <Stack>
+      {!isLoggedIn && <Stack.Screen name="index" options={{ title: "Đăng ký / Đăng nhập" }} />}
+      {isLoggedIn && <Stack.Screen name="(tabs)" options={{ headerShown: false }} />}
+    </Stack>
+  );
+  
+}
diff --git a/app/index.tsx b/app/index.tsx
new file mode 100644
index 0000000..1b90385
--- /dev/null
+++ b/app/index.tsx
@@ -0,0 +1,72 @@
+import { useState } from "react";
+import { View, TextInput, Button, Text, Alert, ScrollView } from "react-native";
+import AsyncStorage from "@react-native-async-storage/async-storage";
+import { useRouter } from "expo-router";
+import { login, register } from "@/services/auth";
+
+export default function AuthScreen() {
+  const router = useRouter();
+  const [mode, setMode] = useState<"login" | "register">("register");
+
+  const [email, setEmail] = useState("");
+  const [password, setPassword] = useState("");
+
+  const handleSubmit = async () => {
+    if (!email.trim() || !password.trim()) {
+      Alert.alert("Lỗi", "Vui lòng nhập email và mật khẩu");
+      return;
+    }
+
+    try {
+      let res;
+      if (mode === "register") {
+        res = await register(email, password);
+      } else {
+        res = await login(email, password);
+      }
+
+      await AsyncStorage.setItem("authToken", res.token);
+      router.replace("/(tabs)/home");
+    } catch (error) {
+      console.log(error);
+      Alert.alert("Lỗi", "Sai thông tin đăng nhập hoặc server lỗi");
+    }
+  };
+
+  return (
+    <ScrollView contentContainerStyle={{ flexGrow: 1, justifyContent: "center", padding: 20 }}>
+      <Text style={{ fontSize: 24, fontWeight: "bold", marginBottom: 20 }}>
+        {mode === "register" ? "Đăng ký tài khoản" : "Đăng nhập"}
+      </Text>
+
+      <TextInput
+        placeholder="Email"
+        style={styles.input}
+        value={email}
+        onChangeText={setEmail}
+        keyboardType="email-address"
+        autoCapitalize="none"
+      />
+      <TextInput
+        placeholder="Mật khẩu"
+        secureTextEntry
+        style={styles.input}
+        value={password}
+        onChangeText={setPassword}
+      />
+
+      <Button title={mode === "register" ? "Đăng ký" : "Đăng nhập"} onPress={handleSubmit} />
+
+      <Text
+        style={{ color: "blue", marginTop: 20, textAlign: "center" }}
+        onPress={() => setMode(mode === "register" ? "login" : "register")}
+      >
+        {mode === "register" ? "Đã có tài khoản? Đăng nhập" : "Chưa có tài khoản? Đăng ký"}
+      </Text>
+    </ScrollView>
+  );
+}
+
+const styles = {
+  input: { borderWidth: 1, marginBottom: 10, padding: 10, borderRadius: 5 },
+};
diff --git a/package-lock.json b/package-lock.json
index 732bd3c..b321a5f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "dependencies": {
         "@expo/vector-icons": "^15.0.3",
+        "@react-native-async-storage/async-storage": "^1.22.0",
         "@react-navigation/bottom-tabs": "^7.4.0",
         "@react-navigation/elements": "^2.6.3",
         "@react-navigation/native": "^7.1.8",
@@ -2670,6 +2671,17 @@
         }
       }
     },
+    "node_modules/@react-native-async-storage/async-storage": {
+      "version": "1.22.0",
+      "resolved": "https://registry.npmjs.org/@react-native-async-storage/async-storage/-/async-storage-1.22.0.tgz",
+      "integrity": "sha512-b5KD010iiZnot86RbAaHpLuHwmPW2qA3SSN/OSZhd1kBoINEQEVBuv+uFtcaTxAhX27bT0wd13GOb2IOSDUXSA==",
+      "dependencies": {
+        "merge-options": "^3.0.4"
+      },
+      "peerDependencies": {
+        "react-native": "^0.0.0-0 || >=0.60 <1.0"
+      }
+    },
     "node_modules/@react-native/assets-registry": {
       "version": "0.81.5",
       "resolved": "https://registry.npmjs.org/@react-native/assets-registry/-/assets-registry-0.81.5.tgz",
@@ -7504,6 +7516,14 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/is-plain-obj": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-2.1.0.tgz",
+      "integrity": "sha512-YWnfyRwxL/+SsrWYfOpUtz5b3YD+nyfkHvjbcanzk8zgyO4ASD67uVMRt8k5bM4lLMDnXfriRhOpemw+NfT1eA==",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/is-regex": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.2.1.tgz",
@@ -8420,6 +8440,17 @@
       "resolved": "https://registry.npmjs.org/memoize-one/-/memoize-one-5.2.1.tgz",
       "integrity": "sha512-zYiwtZUcYyXKo/np96AGZAckk+FWWsUdJ3cHGGmld7+AhvcWmQyGCYUh1hc4Q/pkOhb65dQR/pqCyK0cOaHz4Q=="
     },
+    "node_modules/merge-options": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/merge-options/-/merge-options-3.0.4.tgz",
+      "integrity": "sha512-2Sug1+knBjkaMsMgf1ctR1Ujx+Ayku4EdJN4Z+C2+JzoeF7A3OZ9KM2GY0CpQS51NR61LTurMJrRKPhSs3ZRTQ==",
+      "dependencies": {
+        "is-plain-obj": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/merge-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",
diff --git a/package.json b/package.json
index 240f96e..2f79edb 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
   },
   "dependencies": {
     "@expo/vector-icons": "^15.0.3",
+    "@react-native-async-storage/async-storage": "^1.22.0",
     "@react-navigation/bottom-tabs": "^7.4.0",
     "@react-navigation/elements": "^2.6.3",
     "@react-navigation/native": "^7.1.8",
@@ -31,17 +32,17 @@
     "react-dom": "19.1.0",
     "react-native": "0.81.5",
     "react-native-gesture-handler": "~2.28.0",
-    "react-native-worklets": "0.5.1",
     "react-native-reanimated": "~4.1.1",
     "react-native-safe-area-context": "~5.6.0",
     "react-native-screens": "~4.16.0",
-    "react-native-web": "~0.21.0"
+    "react-native-web": "~0.21.0",
+    "react-native-worklets": "0.5.1"
   },
   "devDependencies": {
     "@types/react": "~19.1.0",
-    "typescript": "~5.9.2",
     "eslint": "^9.25.0",
-    "eslint-config-expo": "~10.0.0"
+    "eslint-config-expo": "~10.0.0",
+    "typescript": "~5.9.2"
   },
   "private": true
 }
diff --git a/services/auth.ts b/services/auth.ts
index e69de29..75a1477 100644
--- a/services/auth.ts
+++ b/services/auth.ts
@@ -0,0 +1,34 @@
+const API_URL = "http://192.168.2.141:8080/api/auth";
+
+export async function register(email: string, password: string) {
+  const response = await fetch(`${API_URL}/register`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ email, password }),
+  });
+
+  if (!response.ok) throw new Error("Đăng ký thất bại");
+  return await response.json();
+}
+
+export async function login(email: string, password: string) {
+  const response = await fetch(`${API_URL}/login`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ email, password }),
+  });
+
+  if (!response.ok) throw new Error("Đăng nhập thất bại");
+  return await response.json();
+}
+
+export async function logout(token: string) {
+  const response = await fetch(`${API_URL}/logout`, {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+      Authorization: `Bearer ${token}`,
+    },
+  });
+  return response.ok;
+}