Index: scribus/ui/factories/scribusproxystyle.cpp
===================================================================
--- scribus/ui/factories/scribusproxystyle.cpp	(revision 27771)
+++ scribus/ui/factories/scribusproxystyle.cpp	(working copy)
@@ -52,6 +52,14 @@
 	darkPalette.setColor(QPalette::HighlightedText, Qt::black);
 	darkPalette.setColor(QPalette::Shadow, Qt::black);
 
+	// Derive Light/Midlight/Dark/Mid from Window so palette(mid)/
+	// palette(light)/palette(dark) lookups in style sheets stay dark.
+	const QColor windowColor = darkPalette.color(QPalette::Window);
+	darkPalette.setColor(QPalette::Light, windowColor.lighter(150));
+	darkPalette.setColor(QPalette::Midlight, windowColor.lighter(120));
+	darkPalette.setColor(QPalette::Dark, windowColor.darker(150));
+	darkPalette.setColor(QPalette::Mid, windowColor.darker(120));
+
 	darkPalette.setColor(QPalette::Disabled, QPalette::Text, Qt::darkGray);
 	darkPalette.setColor(QPalette::Disabled, QPalette::ButtonText, Qt::darkGray);