diff --git a/app/src/main/java/ru/myitschool/work/data/source/NetworkDataSource.kt b/app/src/main/java/ru/myitschool/work/data/source/NetworkDataSource.kt
index 64eb4a0..af2f340 100644
--- a/app/src/main/java/ru/myitschool/work/data/source/NetworkDataSource.kt
+++ b/app/src/main/java/ru/myitschool/work/data/source/NetworkDataSource.kt
@@ -21,7 +21,7 @@ import ru.myitschool.work.data.source.dto.UserDto
 object NetworkDataSource {
 
     /** Поставь false, когда поднимешь настоящий бэкенд */
-    private const val USE_STUB = true
+    private const val USE_STUB = false
 
     // Реальный клиент Ktor (для будущего)
     private val client by lazy {
diff --git a/app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt b/app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt
index 923b90a..ad03e0c 100644
--- a/app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt
+++ b/app/src/main/java/ru/myitschool/work/ui/screen/NavigationGraph.kt
@@ -3,11 +3,16 @@ package ru.myitschool.work.ui.screen
 import androidx.compose.animation.EnterTransition
 import androidx.compose.animation.ExitTransition
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.produceState
+import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.navigation.NavHostController
 import androidx.navigation.compose.NavHost
 import androidx.navigation.compose.composable
 import androidx.navigation.compose.rememberNavController
+import ru.myitschool.work.data.repo.AuthRepository
+import ru.myitschool.work.domain.auth.GetSavedAuthCodeUseCase
 import ru.myitschool.work.ui.nav.AuthScreenDestination
 import ru.myitschool.work.ui.nav.BookScreenDestination
 import ru.myitschool.work.ui.nav.MainScreenDestination
@@ -20,12 +25,30 @@ fun AppNavHost(
     modifier: Modifier = Modifier,
     navController: NavHostController = rememberNavController()
 ) {
+    // use case для проверки, есть ли сохранённый код
+    val getSavedAuthCodeUseCase = remember {
+        GetSavedAuthCodeUseCase(AuthRepository)
+    }
+
+    // асинхронно определяем, с какого экрана стартовать
+    val startDestination by produceState<Any?>(initialValue = null) {
+        val savedCode = getSavedAuthCodeUseCase()
+        value = if (savedCode.isNullOrBlank()) {
+            AuthScreenDestination
+        } else {
+            MainScreenDestination
+        }
+    }
+
+    // Пока не знаем стартовый экран — ничего не рисуем (можно сюда потом воткнуть Splash)
+    val destination = startDestination ?: return
+
     NavHost(
         modifier = modifier,
         enterTransition = { EnterTransition.None },
         exitTransition = { ExitTransition.None },
         navController = navController,
-        startDestination = AuthScreenDestination,
+        startDestination = destination,
     ) {
         composable<AuthScreenDestination> {
             AuthScreen(navController = navController)
diff --git a/app/src/main/java/ru/myitschool/work/ui/screen/auth/AuthScreen.kt b/app/src/main/java/ru/myitschool/work/ui/screen/auth/AuthScreen.kt
index b54ce5a..9746f58 100644
--- a/app/src/main/java/ru/myitschool/work/ui/screen/auth/AuthScreen.kt
+++ b/app/src/main/java/ru/myitschool/work/ui/screen/auth/AuthScreen.kt
@@ -40,7 +40,7 @@ fun AuthScreen(
         viewModel.actionFlow.collect {
             navController.navigate(MainScreenDestination) {
                 // очищаем backstack до экрана авторизации
-                popUpTo(MainScreenDestination) { inclusive = false }
+                popUpTo(MainScreenDestination) { inclusive = true }
             }
         }
     }