diff --git a/app/src/main/java/app/closer/core/navigation/AppNavigation.kt b/app/src/main/java/app/closer/core/navigation/AppNavigation.kt
index fd8d1f7f..0a86fed2 100644
--- a/app/src/main/java/app/closer/core/navigation/AppNavigation.kt
+++ b/app/src/main/java/app/closer/core/navigation/AppNavigation.kt
@@ -124,9 +124,29 @@ fun AppNavigation(
             selectTab(AppRoute.HOME)
         }
     }
+    // The pre-app entry flow (onboarding + profile/pairing setup + auth). Leaving any of
+    // these for Home must CLEAR them from the back stack — otherwise the graph start
+    // (ONBOARDING) lingers as the root under Home and a system Back from Home walks
+    // backward into the onboarding carousel / login screen, making a signed-in user look
+    // logged out (C-NAV-001).
+    val entryRoutes = setOf(
+        AppRoute.ONBOARDING,
+        AppRoute.CREATE_PROFILE,
+        AppRoute.PAIR_PROMPT,
+        AppRoute.LOGIN,
+        AppRoute.SIGN_UP,
+        AppRoute.FORGOT_PASSWORD
+    )
     val navigateRoute: (String) -> Unit = { route ->
         when {
             route == "back" -> navigateBackOrHome()
+            // Completing onboarding/auth: make Home the back-stack root (wipe the entire
+            // entry flow) so Back from Home exits the app, never resurfaces onboarding/login.
+            route == AppRoute.HOME && currentRoute in entryRoutes ->
+                navController.navigate(AppRoute.HOME) {
+                    popUpTo(0) { inclusive = true }
+                    launchSingleTop = true
+                }
             // Top-level tabs must use tab-switch semantics. Plain-navigating to a
             // tab (e.g. a "Game waiting" card → PLAY) would stack it on the current
             // tab; the bottom bar then saves that substack and `restoreState` later