diff --git a/booru_viewer/gui/preview.py b/booru_viewer/gui/preview.py
index e63fb46..6e5e1ed 100644
--- a/booru_viewer/gui/preview.py
+++ b/booru_viewer/gui/preview.py
@@ -341,13 +341,15 @@ class FullscreenPreview(QMainWindow):
                 self._show_overlay()
                 return True
         if event.type() == QEvent.Type.MouseMove and self.isActiveWindow():
-            y = event.position().y() if hasattr(event, 'position') else event.pos().y()
-            h = self.centralWidget().height()
-            toolbar_zone = 40  # px from top/bottom edge to trigger
-            if y < toolbar_zone:
+            # Map cursor position to window coordinates
+            cursor_pos = self.mapFromGlobal(event.globalPosition().toPoint() if hasattr(event, 'globalPosition') else event.globalPos())
+            y = cursor_pos.y()
+            h = self.height()
+            zone = 40  # px from top/bottom edge to trigger
+            if y < zone:
                 self._toolbar.show()
                 self._hide_timer.start()
-            elif y > h - toolbar_zone and self._stack.currentIndex() == 1:
+            elif y > h - zone and self._stack.currentIndex() == 1:
                 self._video._controls_bar.show()
                 self._hide_timer.start()
             self._ui_visible = self._toolbar.isVisible() or self._video._controls_bar.isVisible()