diff --git a/src/components/ui/AppText.tsx b/src/components/ui/AppText.tsx
index 4eacf0a..563a7c6 100644
--- a/src/components/ui/AppText.tsx
+++ b/src/components/ui/AppText.tsx
@@ -1,12 +1,17 @@
 import React from "react";
-import { Text, type TextProps, type TextStyle } from "react-native";
+import {
+  Text,
+  type StyleProp,
+  type TextProps,
+  type TextStyle,
+} from "react-native";
 import { Theme } from "../../theme/theme";
 
 type Variant = "logo" | "title" | "body" | "muted" | "error";
 
 type Props = TextProps & {
   variant?: Variant;
-  style?: TextStyle | TextStyle[];
+  style?: StyleProp<TextStyle>;
 };
 
 export default function AppText({ variant = "body", style, ...props }: Props) {
diff --git a/src/components/ui/Button.tsx b/src/components/ui/Button.tsx
index 634afcb..d9021a3 100644
--- a/src/components/ui/Button.tsx
+++ b/src/components/ui/Button.tsx
@@ -1,5 +1,5 @@
 import React from "react";
-import { Pressable, type PressableProps, StyleSheet, View } from "react-native";
+import { Pressable, type PressableProps, StyleSheet } from "react-native";
 import { Theme } from "../../theme/theme";
 import AppText from "./AppText";
 
@@ -12,6 +12,7 @@ export default function Button({
   title,
   variant = "primary",
   style,
+  disabled,
   ...props
 }: Props) {
   const isPrimary = variant === "primary";
@@ -19,42 +20,42 @@ export default function Button({
   return (
     <Pressable
       {...props}
+      disabled={disabled}
       style={({ pressed }) => [
         styles.base,
         isPrimary ? styles.primary : styles.secondary,
-        pressed &&
+
+        // pressed 스타일(비활성화면 적용 안 함)
+        !disabled &&
+          pressed &&
           (isPrimary ? styles.primaryPressed : styles.secondaryPressed),
+
+        // disabled 스타일
+        disabled && styles.disabled,
+
         typeof style === "function" ? style({ pressed }) : style,
       ]}
     >
-      <View>
-        <AppText
-          style={{
-            textAlign: "center",
-            fontWeight: Theme.FontWeight.bold,
-            color: isPrimary ? Theme.Colors.text : Theme.Colors.text,
-          }}
-        >
-          {title}
-        </AppText>
-      </View>
+      <AppText
+        style={[
+          styles.text,
+          isPrimary ? styles.textPrimary : styles.textSecondary,
+          disabled && styles.textDisabled,
+        ]}
+      >
+        {title}
+      </AppText>
     </Pressable>
   );
 }
 
 const styles = StyleSheet.create({
   base: {
-    height: 48,
-    paddingVertical: 0,
-    paddingHorizontal: Theme.Spacing.lg,
+    paddingVertical: Theme.Spacing.md,
     borderRadius: Theme.Radius.md,
-    alignItems: "center", // 가로 가운데
-    justifyContent: "center", // 세로 가운데
-  },
-  text: {
-    textAlign: "center",
-    fontWeight: Theme.FontWeight.bold,
-    lineHeight: 20,
+    alignItems: "center",
+    justifyContent: "center",
+    minHeight: 48,
   },
   primary: {
     backgroundColor: Theme.Colors.primary,
@@ -70,4 +71,22 @@ const styles = StyleSheet.create({
   secondaryPressed: {
     opacity: 0.9,
   },
+
+  disabled: {
+    opacity: 0.5,
+  },
+
+  text: {
+    textAlign: "center",
+    fontWeight: Theme.FontWeight.bold,
+  },
+  textPrimary: {
+    color: Theme.Colors.text,
+  },
+  textSecondary: {
+    color: Theme.Colors.text,
+  },
+  textDisabled: {
+    color: Theme.Colors.mutedText,
+  },
 });
diff --git a/src/navigation/AuthStack.tsx b/src/navigation/AuthStack.tsx
index 49c671d..fd38061 100644
--- a/src/navigation/AuthStack.tsx
+++ b/src/navigation/AuthStack.tsx
@@ -1,9 +1,11 @@
 import { createNativeStackNavigator } from "@react-navigation/native-stack";
 import React from "react";
 import LoginScreen from "../screens/LoginScreen";
+import SignUpScreen from "../screens/SignUpScreen";
 
 export type AuthStackParamList = {
   Login: undefined;
+  SignUp: undefined;
 };
 
 const Stack = createNativeStackNavigator<AuthStackParamList>();
@@ -12,6 +14,10 @@ export default function AuthStack() {
   return (
     <Stack.Navigator screenOptions={{ headerShown: false }}>
       <Stack.Screen name="Login" component={LoginScreen} />
+
+      <Stack.Group screenOptions={{ presentation: "modal" }}>
+        <Stack.Screen name="SignUp" component={SignUpScreen} />
+      </Stack.Group>
     </Stack.Navigator>
   );
 }
diff --git a/src/screens/HomeScreen.tsx b/src/screens/HomeScreen.tsx
index e3ef1b1..0c8427a 100644
--- a/src/screens/HomeScreen.tsx
+++ b/src/screens/HomeScreen.tsx
@@ -1,7 +1,9 @@
 import AsyncStorage from "@react-native-async-storage/async-storage";
 import { Button, StyleSheet, View } from "react-native";
+import { useAuth } from "../store/auth";
 
 export default function HomeScreen() {
+  const { signOut } = useAuth();
   return (
     <View style={styles.container}>
       <Button
@@ -12,6 +14,7 @@ export default function HomeScreen() {
           console.log(entries);
         }}
       />
+      <Button title="logout" onPress={() => signOut()}></Button>
     </View>
   );
 }
diff --git a/src/screens/LoginScreen.tsx b/src/screens/LoginScreen.tsx
index ab09e32..b5912f7 100644
--- a/src/screens/LoginScreen.tsx
+++ b/src/screens/LoginScreen.tsx
@@ -1,9 +1,12 @@
+import { useNavigation } from "@react-navigation/native";
+import { NativeStackNavigationProp } from "@react-navigation/native-stack";
 import React, { useState } from "react";
 import { Pressable, StyleSheet, View } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
 import AppText from "../components/ui/AppText";
 import Button from "../components/ui/Button";
 import Input from "../components/ui/Input";
+import { AuthStackParamList } from "../navigation/AuthStack";
 import { useAuth } from "../store/auth";
 import { Theme } from "../theme/theme";
 
@@ -12,6 +15,8 @@ export default function LoginScreen() {
   const [loginId, setLoginId] = useState("");
   const [password, setPassword] = useState("");
   const canSubmit = loginId.trim().length > 0 && password.length > 0;
+  const navigation =
+    useNavigation<NativeStackNavigationProp<AuthStackParamList>>();
 
   return (
     <SafeAreaView style={styles.safe}>
@@ -60,7 +65,7 @@ export default function LoginScreen() {
 
         <Pressable
           onPress={() => {
-            console.log("feawf");
+            navigation.navigate("SignUp");
           }}
         >
           <AppText variant="muted" style={styles.signupLine}>
diff --git a/src/screens/SignUpScreen.tsx b/src/screens/SignUpScreen.tsx
new file mode 100644
index 0000000..fe705c9
--- /dev/null
+++ b/src/screens/SignUpScreen.tsx
@@ -0,0 +1,121 @@
+import { useNavigation } from "@react-navigation/native";
+import React, { useMemo, useState } from "react";
+import { StyleSheet, View } from "react-native";
+import { SafeAreaView } from "react-native-safe-area-context";
+import AppText from "../components/ui/AppText";
+import Button from "../components/ui/Button";
+import Input from "../components/ui/Input";
+import { Theme } from "../theme/theme";
+
+export default function SignUpScreen() {
+  const navigation = useNavigation();
+
+  const [loginId, setLoginId] = useState("");
+  const [password, setPassword] = useState("");
+  const [passwordConfirm, setPasswordConfirm] = useState("");
+
+  const { canSubmit, errorText } = useMemo(() => {
+    const idOk = loginId.trim().length >= 4;
+    const pwOk = password.length >= 8;
+    const match = password.length > 0 && password === passwordConfirm;
+
+    const can = idOk && pwOk && match;
+
+    let err = "";
+    if (loginId.length > 0 && !idOk)
+      err = "Username must be at least 4 characters.";
+    else if (password.length > 0 && !pwOk)
+      err = "Password must be at least 8 characters.";
+    else if (passwordConfirm.length > 0 && !match)
+      err = "Passwords do not match.";
+
+    return { canSubmit: can, errorText: err };
+  }, [loginId, password, passwordConfirm]);
+
+  const onSignUp = async () => {
+    navigation.goBack();
+  };
+
+  return (
+    <SafeAreaView style={styles.safe}>
+      <View style={styles.container}>
+        <AppText variant="title">Create your account</AppText>
+        <AppText variant="muted">Start listening in minutes</AppText>
+
+        <View style={{ height: Theme.Spacing.lg }} />
+
+        <Input
+          placeholder="Username"
+          autoCapitalize="none"
+          autoCorrect={false}
+          textContentType="username"
+          value={loginId}
+          onChangeText={setLoginId}
+          returnKeyType="next"
+        />
+
+        <View style={{ height: Theme.Spacing.sm }} />
+
+        <Input
+          placeholder="Password"
+          secureTextEntry
+          autoCapitalize="none"
+          autoCorrect={false}
+          textContentType="newPassword"
+          value={password}
+          onChangeText={setPassword}
+          returnKeyType="next"
+        />
+
+        <View style={{ height: Theme.Spacing.sm }} />
+
+        <Input
+          placeholder="Confirm password"
+          secureTextEntry
+          autoCapitalize="none"
+          autoCorrect={false}
+          textContentType="newPassword"
+          value={passwordConfirm}
+          onChangeText={setPasswordConfirm}
+          returnKeyType="done"
+          onSubmitEditing={() => {
+            if (canSubmit) onSignUp();
+          }}
+        />
+
+        {errorText ? (
+          <AppText variant="muted" style={styles.error}>
+            {errorText}
+          </AppText>
+        ) : null}
+
+        <View style={{ height: Theme.Spacing.lg }} />
+
+        <Button title="Sign up" disabled={!canSubmit} onPress={onSignUp} />
+        <View style={{ height: Theme.Spacing.sm }} />
+        <Button
+          title="Back"
+          variant="secondary"
+          onPress={() => navigation.goBack()}
+        />
+      </View>
+    </SafeAreaView>
+  );
+}
+
+const styles = StyleSheet.create({
+  safe: {
+    flex: 1,
+    backgroundColor: Theme.Colors.bg,
+  },
+  container: {
+    flex: 1,
+    padding: Theme.Spacing.xl,
+    justifyContent: "center",
+    gap: Theme.Spacing.sm,
+  },
+  error: {
+    textAlign: "center",
+    color: Theme.Colors.mutedText,
+  },
+});