--- qtbase/src/widgets/styles/qfusionstyle.cpp	2025-09-03 17:32:08
+++ qtbase/src/widgets/styles/qfusionstyle.cpp	2025-09-03 17:56:20
@@ -588,11 +588,12 @@
 
             painter->setBrush((state & State_Sunken) ? QBrush(pressedColor) : gradient);
 
-            if (option->state & State_HasFocus && option->state & State_KeyboardFocusChange)
+            if (option->state & State_HasFocus && option->state & State_KeyboardFocusChange) {
                 painter->setPen(highlightedOutline);
-            else
-                painter->setPen(colorScheme() == Qt::ColorScheme::Dark ? outline.lighter(240)
-                                                                       : outline.lighter(110));
+            } else {
+                const bool isDark = (option->palette.windowText().color().value() > option->palette.window().color().value());
+                painter->setPen(isDark ? outline.lighter(155) : outline.lighter(110));
+            }
             painter->drawRect(rect);
 
             QColor checkMarkColor = option->palette.text().color().darker(120);