diff --git a/src/Gui/StartupProcess.cpp b/src/Gui/StartupProcess.cpp
index fd1f497535..ce9181d743 100644
--- a/src/Gui/StartupProcess.cpp
+++ b/src/Gui/StartupProcess.cpp
@@ -341,6 +341,17 @@ void StartupPostProcess::migrateOldTheme(const std::string& style)
     if (style == "FreeCAD Light.qss" || style == "FreeCAD Dark.qss") {
         prefPackManager->apply("KindredCreate");
     }
+
+    // Ensure the Theme parameter is set for KindredCreate so the style
+    // parameter YAML file (parameters/KindredCreate.yaml) is found.
+    if (style == "KindredCreate.qss") {
+        auto hGrp = App::GetApplication().GetParameterGroupByPath(
+            "User parameter:BaseApp/Preferences/MainWindow"
+        );
+        if (hGrp->GetASCII("Theme", "Classic") == "Classic") {
+            hGrp->SetASCII("Theme", "KindredCreate");
+        }
+    }
 }
 
 void StartupPostProcess::checkOpenGL()
diff --git a/src/Gui/Stylesheets/CMakeLists.txt b/src/Gui/Stylesheets/CMakeLists.txt
index c025a75b72..7874437f5a 100644
--- a/src/Gui/Stylesheets/CMakeLists.txt
+++ b/src/Gui/Stylesheets/CMakeLists.txt
@@ -6,6 +6,8 @@ SET(Stylesheets_Files
 )
 
 SET(Parameters_Files
+    "parameters/Classic.yaml"
+    "parameters/KindredCreate.yaml"
 )
 
 SET(Overlay_Stylesheets_Files
diff --git a/src/Gui/Stylesheets/parameters/Classic.yaml b/src/Gui/Stylesheets/parameters/Classic.yaml
new file mode 100644
index 0000000000..5820b33d4c
--- /dev/null
+++ b/src/Gui/Stylesheets/parameters/Classic.yaml
@@ -0,0 +1,85 @@
+# KindredCreate theme parameters - Catppuccin Mocha palette
+# Used by FreeCAD.qss and overlay stylesheets for token substitution
+
+# Primary surfaces
+PrimaryColor: "#1e1e2e"
+PrimaryColorDarken2: "#181825"
+DialogBackgroundColor: "#1e1e2e"
+GeneralBackgroundColor: "#1e1e2e"
+GeneralAlternateBackgroundColor: "#181825"
+
+# Text
+TextForegroundColor: "#cdd6f4"
+TextDisabledColor: "#6c7086"
+TextUrlColor: "#89b4fa"
+TextSelectBackgroundColor: "#585b70"
+
+# Input fields
+TextEditFieldBackgroundColor: "#313244"
+InputFieldBorderRadius: "2px"
+
+# Borders
+GeneralBorderColor: "#45475a"
+GeneralBorderHoverColor: "#585b70"
+
+# Buttons
+ButtonTopBackgroundColor: "#313244"
+ButtonBottomBackgroundColor: "#313244"
+ButtonBorderColor: "#45475a"
+DefaultButtonTopBackgroundColor: "#cba6f7"
+DefaultButtonBottomBackgroundColor: "#cba6f7"
+DefaultButtonBorderColor: "#cba6f7"
+CheckedButtonTopBackgroundColor: "#45475a"
+CheckedButtonBottomBackgroundColor: "#45475a"
+
+# Accent
+AccentColor: "#cba6f7"
+AccentBackgroundColor: "#45475a"
+AccentHoverColor: "#b4befe"
+
+# Interactive states
+GeneralBackgroundHoverColor: "#313244"
+GeneralDisabledBackgroundColor: "#181825"
+GeneralHeaderBackgroundColor: "#313244"
+
+# Grid
+GeneralGridLinesColor: "#313244"
+3DViewBackgroundRefColor: "#181825"
+
+# Groupbox
+GroupboxBackgroundColor: "#1e1e2e"
+GroupboxBorderColor: "#45475a"
+
+# Menu
+MenuBackgroundColor: "#181825"
+
+# Scrollbar
+ScrollbarBackgroundColor: "#181825"
+
+# Tabs
+TabbarBackgroundColor: "#181825"
+ActiveTabBackgroundColor: "#1e1e2e"
+InActiveTabBackgroundColor: "#313244"
+
+# Checkbox and radio
+CheckBoxBackgroundColor: "#313244"
+CheckBoxBorderColor: "#585b70"
+RadioButtonBackgroundColor: "#313244"
+RadioButtonBorderColor: "#585b70"
+
+# Toolbar
+ToolbarButtonsPadding: "4px"
+
+# Icons
+IconsLocationFolderName: "images_classic"
+StylesheetIconsColor: "white"
+
+# Sketcher constraint colors
+SketcherFullyConstrainedColor: "#a6e3a1"
+SketcherUnderConstrainedColor: "#f9e2af"
+SketcherConflictingConstraintsColor: "#f38ba8"
+SketcherRedundantConstraintsColor: "#fab387"
+SketcherMalformedConstraintsColor: "#f38ba8"
+SketcherPartiallyRedundantConstraintsColor: "#fab387"
+SketcherSolverFailedColor: "#f38ba8"
+SketcherEmptySketchColor: "#6c7086"
diff --git a/src/Gui/Stylesheets/parameters/KindredCreate.yaml b/src/Gui/Stylesheets/parameters/KindredCreate.yaml
new file mode 100644
index 0000000000..5820b33d4c
--- /dev/null
+++ b/src/Gui/Stylesheets/parameters/KindredCreate.yaml
@@ -0,0 +1,85 @@
+# KindredCreate theme parameters - Catppuccin Mocha palette
+# Used by FreeCAD.qss and overlay stylesheets for token substitution
+
+# Primary surfaces
+PrimaryColor: "#1e1e2e"
+PrimaryColorDarken2: "#181825"
+DialogBackgroundColor: "#1e1e2e"
+GeneralBackgroundColor: "#1e1e2e"
+GeneralAlternateBackgroundColor: "#181825"
+
+# Text
+TextForegroundColor: "#cdd6f4"
+TextDisabledColor: "#6c7086"
+TextUrlColor: "#89b4fa"
+TextSelectBackgroundColor: "#585b70"
+
+# Input fields
+TextEditFieldBackgroundColor: "#313244"
+InputFieldBorderRadius: "2px"
+
+# Borders
+GeneralBorderColor: "#45475a"
+GeneralBorderHoverColor: "#585b70"
+
+# Buttons
+ButtonTopBackgroundColor: "#313244"
+ButtonBottomBackgroundColor: "#313244"
+ButtonBorderColor: "#45475a"
+DefaultButtonTopBackgroundColor: "#cba6f7"
+DefaultButtonBottomBackgroundColor: "#cba6f7"
+DefaultButtonBorderColor: "#cba6f7"
+CheckedButtonTopBackgroundColor: "#45475a"
+CheckedButtonBottomBackgroundColor: "#45475a"
+
+# Accent
+AccentColor: "#cba6f7"
+AccentBackgroundColor: "#45475a"
+AccentHoverColor: "#b4befe"
+
+# Interactive states
+GeneralBackgroundHoverColor: "#313244"
+GeneralDisabledBackgroundColor: "#181825"
+GeneralHeaderBackgroundColor: "#313244"
+
+# Grid
+GeneralGridLinesColor: "#313244"
+3DViewBackgroundRefColor: "#181825"
+
+# Groupbox
+GroupboxBackgroundColor: "#1e1e2e"
+GroupboxBorderColor: "#45475a"
+
+# Menu
+MenuBackgroundColor: "#181825"
+
+# Scrollbar
+ScrollbarBackgroundColor: "#181825"
+
+# Tabs
+TabbarBackgroundColor: "#181825"
+ActiveTabBackgroundColor: "#1e1e2e"
+InActiveTabBackgroundColor: "#313244"
+
+# Checkbox and radio
+CheckBoxBackgroundColor: "#313244"
+CheckBoxBorderColor: "#585b70"
+RadioButtonBackgroundColor: "#313244"
+RadioButtonBorderColor: "#585b70"
+
+# Toolbar
+ToolbarButtonsPadding: "4px"
+
+# Icons
+IconsLocationFolderName: "images_classic"
+StylesheetIconsColor: "white"
+
+# Sketcher constraint colors
+SketcherFullyConstrainedColor: "#a6e3a1"
+SketcherUnderConstrainedColor: "#f9e2af"
+SketcherConflictingConstraintsColor: "#f38ba8"
+SketcherRedundantConstraintsColor: "#fab387"
+SketcherMalformedConstraintsColor: "#f38ba8"
+SketcherPartiallyRedundantConstraintsColor: "#fab387"
+SketcherSolverFailedColor: "#f38ba8"
+SketcherEmptySketchColor: "#6c7086"