Use one base font size and a per-profile startup design

JavaFX picks a 13px default font on macOS and Linux but 12px on
Windows, so labels in fixed-size controls were cut off outside
Windows. Both stylesheets now set 12px on the root.

Each operator profile now chooses light or dark mode for startup on
the GUI settings tab. The Windows menu entries remain a quick switch
for the running session. All windows, including the update window
and the top candidates list, follow the design, and the main window
no longer starts light while the station map starts dark.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/java/kst4contest/view/Kst4ContestApplication.java

@@ -133,6 +133,9 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 	private On4KstConnectionState lastDisplayedConnectionState;
 	private String lastDisplayedConnectionDetail = "";
 
+	/** Scenes whose stylesheet follows the light/dark design switch. */
+	private final List<Scene> themedScenes = new ArrayList<>();
+
 	private final Button btnBandUpgradeIndicator = new Button("BAND+");
 	private final Tooltip tipBandUpgradeIndicator = new Tooltip();
 	private Timeline bandUpgradeBlinkTimeline;
@@ -4589,7 +4592,10 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		root.setCenter(listView);
 		root.setBottom(new Label("Double-click a candidate to select it."));
 
-		stage.setScene(new Scene(root, 360, 500));
+		Scene candidatesScene = new Scene(root, 360, 500);
+		registerThemedScene(candidatesScene);
+		stage.setOnHidden(event -> themedScenes.remove(candidatesScene));
+		stage.setScene(candidatesScene);
 		stage.show();
 	}
 
@@ -5621,21 +5627,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		window30.setOnAction(new EventHandler<ActionEvent>() {
 			public void handle(ActionEvent event) {
 
-				System.out.println("KST4ContestApp, info: switching to dark mode");
-
-				scn_ChatwindowMainScene.getStylesheets().clear();
-				clusterAndQSOMonScene.getStylesheets().clear();
-				settingsScene.getStylesheets().clear();
-				setUserAgentStylesheet(null);
-
-				scn_ChatwindowMainScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_EVENING);
-				clusterAndQSOMonScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_EVENING);
-				settingsScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_EVENING);
-
-				chatcontroller.getChatPreferences().setGUI_darkModeActive(true);
-				if (stationMapBridge != null) {
-					stationMapBridge.applyThemeFromPreferences(); //dark mode for the map
-				}
+				// quick switch for this session only, the startup design is set per profile in the GUI options
+				applyTheme(true);
 			}
 		});
 
@@ -5643,21 +5636,8 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		window40.setOnAction(new EventHandler<ActionEvent>() {
 			public void handle(ActionEvent event) {
 
-				System.out.println("KST4ContestApp, info: switching to default mode");
-
-				scn_ChatwindowMainScene.getStylesheets().clear();
-				clusterAndQSOMonScene.getStylesheets().clear();
-				settingsScene.getStylesheets().clear();
-				setUserAgentStylesheet(null);
-
-				scn_ChatwindowMainScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_DAYLIGHT);
-				clusterAndQSOMonScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_DAYLIGHT);
-				settingsScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_DAYLIGHT);
-				chatcontroller.getChatPreferences().setGUI_darkModeActive(false);
-
-				if (stationMapBridge != null) {
-					stationMapBridge.applyThemeFromPreferences();
-				}
+				// quick switch for this session only, the startup design is set per profile in the GUI options
+				applyTheme(false);
 			}
 		});
 
@@ -5779,6 +5759,43 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		return menubar;
 	}
 
+	/**
+	 * Registers a scene whose stylesheet follows the light/dark design switch and
+	 * applies the currently active design to it.
+	 */
+	private void registerThemedScene(Scene scene) {
+		if (scene == null) {
+			return;
+		}
+		themedScenes.add(scene);
+		applyThemeStylesheet(scene, chatcontroller.getChatPreferences().isGUI_darkModeActive());
+	}
+
+	/**
+	 * Switches all registered windows and the station map to the dark or light design
+	 * for the running session. The per-profile startup design is not changed here.
+	 */
+	private void applyTheme(boolean darkMode) {
+		LOGGER.info("Switching GUI design to " + (darkMode ? "dark" : "light") + " mode");
+
+		chatcontroller.getChatPreferences().setGUI_darkModeActive(darkMode);
+		setUserAgentStylesheet(null);
+
+		for (Scene scene : themedScenes) {
+			applyThemeStylesheet(scene, darkMode);
+		}
+
+		if (stationMapBridge != null) {
+			stationMapBridge.applyThemeFromPreferences();
+		}
+	}
+
+	private static void applyThemeStylesheet(Scene scene, boolean darkMode) {
+		scene.getStylesheets().setAll(darkMode
+				? ApplicationConstants.STYLECSSFILE_DEFAULT_EVENING
+				: ApplicationConstants.STYLECSSFILE_DEFAULT_DAYLIGHT);
+	}
+
 
 	/*****************************************************
 	 * Sked warning Initializing and functional section
@@ -6975,6 +6992,9 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 				activeOperatorProfile.getWorkedDatabaseRelativeFileName(),
 				activeOperatorProfile.isSeedWorkedDatabaseFromResource());
 		layoutAutosave = new LayoutAutosave(chatcontroller.getChatPreferences());
+		// Every profile starts with its own configured design; the menu quick switch only lasts for the session.
+		chatcontroller.getChatPreferences().setGUI_darkModeActive(
+				chatcontroller.getChatPreferences().isGUI_darkModeActiveByDefault());
 		messageVariableResolver = new MessageVariableResolver(chatcontroller.getChatPreferences());
 		chatcontroller.setStatusListener(this); //callback interface for updating Thread events in visual
 
@@ -7109,7 +7129,7 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 					screenAwareMainSceneSizeHW[0]
 			);
 
-			scn_ChatwindowMainScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_DAYLIGHT);
+			registerThemedScene(scn_ChatwindowMainScene);
 
 
 
@@ -9123,7 +9143,7 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 
 
 		clusterAndQSOMonScene = new Scene(pnl_directedMSGWin, chatcontroller.getChatPreferences().getGUIclusterAndQSOMonStage_SceneSizeHW()[0], chatcontroller.getChatPreferences().getGUIclusterAndQSOMonStage_SceneSizeHW()[1]);
-		clusterAndQSOMonScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_DAYLIGHT);
+		registerThemedScene(clusterAndQSOMonScene);
 
 		clusterAndQSOMonScene.heightProperty().addListener(new ChangeListener<Number>() {
 			@Override
@@ -9251,6 +9271,7 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		System.out.println("SRVR Version: " + chatcontroller.getUpdateInformation().getLatestVersionNumberOnServer() + " // installed version " + ApplicationConstants.APPLICATION_CURRENTVERSIONNUMBER);
 
 		stage_updateStage.setScene(new Scene(vbxUpdateWindow, chatcontroller.getChatPreferences().getGUIstage_updateStage_SceneSizeHW()[0], chatcontroller.getChatPreferences().getGUIstage_updateStage_SceneSizeHW()[1]));
+		registerThemedScene(stage_updateStage.getScene());
 		stage_updateStage.getScene().widthProperty().addListener((observable, oldValue, newValue) -> {
 			chatcontroller.getChatPreferences().getGUIstage_updateStage_SceneSizeHW()[0] = newValue.doubleValue();
 			requestLayoutSave();
@@ -11944,6 +11965,33 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 		grdPnlGuiOptions.add(lblShowFreshCallHint, 0, 6);
 		grdPnlGuiOptions.add(chkBxShowFreshCallHint, 1, 6);
 
+		// Startup design of this operator profile; the Windows menu only switches for the session.
+		grdPnlGuiOptions.add(generateLabeledSeparator(100, "Design"), 0, 7, 2, 1);
+
+		ToggleGroup guiOptions_tglGrpDesign = new ToggleGroup();
+		RadioButton designLightModeRB = new RadioButton("Light mode ");
+		designLightModeRB.setToggleGroup(guiOptions_tglGrpDesign);
+		RadioButton designDarkModeRB = new RadioButton("Dark mode ");
+		designDarkModeRB.setToggleGroup(guiOptions_tglGrpDesign);
+
+		if (chatcontroller.getChatPreferences().isGUI_darkModeActiveByDefault()) {
+			designDarkModeRB.setSelected(true);
+		} else {
+			designLightModeRB.setSelected(true);
+		}
+
+		guiOptions_tglGrpDesign.selectedToggleProperty().addListener((obs, oldToggle, newToggle) -> {
+			if (newToggle == null) {
+				return;
+			}
+			boolean darkMode = newToggle == designDarkModeRB;
+			chatcontroller.getChatPreferences().setGUI_darkModeActiveByDefault(darkMode);
+			applyTheme(darkMode);
+		});
+
+		grdPnlGuiOptions.add(new Label("Design at startup of this profile:"), 0, 8);
+		grdPnlGuiOptions.add(new HBox(designLightModeRB, designDarkModeRB), 1, 8);
+
 
 
 
@@ -12260,7 +12308,7 @@ public class Kst4ContestApplication extends Application implements StatusUpdateL
 
 //        VBox vBox = new VBox(tabPaneOptions);
 		settingsScene = new Scene(optionsPanel, chatcontroller.getChatPreferences().getGUIsettingsStageSceneSizeHW()[0], chatcontroller.getChatPreferences().getGUIsettingsStageSceneSizeHW()[1]);
-		settingsScene.getStylesheets().add(ApplicationConstants.STYLECSSFILE_DEFAULT_DAYLIGHT);
+		registerThemedScene(settingsScene);
 		settingsScene.widthProperty().addListener((observable, oldValue, newValue) -> {
 			chatcontroller.getChatPreferences().getGUIsettingsStageSceneSizeHW()[0] = newValue.doubleValue();
 			requestLayoutSave();

src/main/java/kst4contest/view/OperatorProfilePickerDialog.java

@@ -90,6 +90,8 @@ public final class OperatorProfilePickerDialog {
                 profileListView,
                 buttonRow);
         dialogContent.setPadding(new Insets(15));
+        // No application stylesheet yet: use the same base font size as the main windows.
+        dialogContent.setStyle("-fx-font-size: 12px;");
 
         dialogStage.setScene(new Scene(dialogContent, 380, 280));
         profileListView.requestFocus();

src/main/resources/KST4ContestDefaultDay.css

@@ -1,3 +1,8 @@
+.root {
+    /* Same base font size on all platforms: macOS/Linux default to 13px, Windows to 12px. */
+    -fx-font-size: 12px;
+}
+
 .button:pressed {
     -fx-border-color: #ff0000;
 }

src/main/resources/KST4ContestDefaultEvening.css

@@ -1,4 +1,6 @@
 .root {
+    /* Same base font size on all platforms: macOS/Linux default to 13px, Windows to 12px. */
+    -fx-font-size: 12px;
     -fx-accent: #1e74c6;
     -fx-focus-color: -fx-accent;
     -fx-base: #373e43;