DarkMode ist existent yeah

views/platform_selector.py

@@ -48,7 +48,7 @@ class PlatformSelector(QWidget):
         
         # Content Container mit gestapelten Widgets
         self.content_stack = QStackedWidget()
-        self.content_stack.setStyleSheet("background-color: #F8FAFC;")
+        self.content_stack.setObjectName("content_stack")  # For QSS targeting, no inline styles!
         
         # Platform Grid View (Tab 0)
         self.platform_grid = PlatformGridView(self.language_manager)