diff --git a/Marechai.App/Presentation/ViewModels/SettingsViewModel.cs b/Marechai.App/Presentation/ViewModels/SettingsViewModel.cs
index 5401b5bb..6a1e4c3e 100644
--- a/Marechai.App/Presentation/ViewModels/SettingsViewModel.cs
+++ b/Marechai.App/Presentation/ViewModels/SettingsViewModel.cs
@@ -105,6 +105,11 @@ public partial class SettingsViewModel : ObservableObject
             {
                 ThemeName   = "Amiga",
                 DisplayName = _localizer["AmigaTheme"]
+            },
+            new()
+            {
+                ThemeName   = "CDE",
+                DisplayName = _localizer["CDETheme"]
             }
         };
 
diff --git a/Marechai.App/Services/ColorThemeService.cs b/Marechai.App/Services/ColorThemeService.cs
index f11e7c32..4dbb207c 100644
--- a/Marechai.App/Services/ColorThemeService.cs
+++ b/Marechai.App/Services/ColorThemeService.cs
@@ -36,7 +36,8 @@ public class ColorThemeService : IColorThemeService
         "Windows311",
         "MacOS9",
         "DOS",
-        "Amiga"
+        "Amiga",
+        "CDE"
     };
 
     public void SetThemeService(IThemeService themeService)
@@ -95,6 +96,7 @@ public class ColorThemeService : IColorThemeService
                                    "MacOS9"     => "ms-appx:///Styles/MacOS9ColorPalette.xaml",
                                    "DOS"        => "ms-appx:///Styles/DOSColorPalette.xaml",
                                    "Amiga"      => "ms-appx:///Styles/AmigaColorPalette.xaml",
+                                   "CDE"        => "ms-appx:///Styles/CDEColorPalette.xaml",
                                    _            => null
                                };
 
diff --git a/Marechai.App/Strings/en/Resources.resw b/Marechai.App/Strings/en/Resources.resw
index 11395eb9..8a318269 100644
--- a/Marechai.App/Strings/en/Resources.resw
+++ b/Marechai.App/Strings/en/Resources.resw
@@ -209,6 +209,9 @@
   <data name="AmigaTheme" xml:space="preserve">
     <value>Amiga Workbench</value>
   </data>
+  <data name="CDETheme" xml:space="preserve">
+    <value>CDE / Motif</value>
+  </data>
   <data name="SettingsPage_BrightnessThemeSelector.Header" xml:space="preserve">
     <value>Brightness</value>
   </data>
diff --git a/Marechai.App/Strings/es/Resources.resw b/Marechai.App/Strings/es/Resources.resw
index a75ac2e8..07bac86e 100644
--- a/Marechai.App/Strings/es/Resources.resw
+++ b/Marechai.App/Strings/es/Resources.resw
@@ -209,6 +209,9 @@
   <data name="AmigaTheme" xml:space="preserve">
     <value>Amiga Workbench</value>
   </data>
+  <data name="CDETheme" xml:space="preserve">
+    <value>CDE / Motif</value>
+  </data>
   <data name="SettingsPage_BrightnessThemeSelector.Header" xml:space="preserve">
     <value>Brillo</value>
   </data>
diff --git a/Marechai.App/Strings/fr/Resources.resw b/Marechai.App/Strings/fr/Resources.resw
index 001926c2..e16e0b04 100644
--- a/Marechai.App/Strings/fr/Resources.resw
+++ b/Marechai.App/Strings/fr/Resources.resw
@@ -209,6 +209,9 @@
   <data name="AmigaTheme" xml:space="preserve">
     <value>Amiga Workbench</value>
   </data>
+  <data name="CDETheme" xml:space="preserve">
+    <value>CDE / Motif</value>
+  </data>
   <data name="SettingsPage_BrightnessThemeSelector.Header" xml:space="preserve">
     <value>Luminosité</value>
   </data>
diff --git a/Marechai.App/Strings/pt-BR/Resources.resw b/Marechai.App/Strings/pt-BR/Resources.resw
index dfc9fab8..96a3ee19 100644
--- a/Marechai.App/Strings/pt-BR/Resources.resw
+++ b/Marechai.App/Strings/pt-BR/Resources.resw
@@ -209,6 +209,9 @@
   <data name="AmigaTheme" xml:space="preserve">
     <value>Amiga Workbench</value>
   </data>
+  <data name="CDETheme" xml:space="preserve">
+    <value>CDE / Motif</value>
+  </data>
   <data name="SettingsPage_BrightnessThemeSelector.Header" xml:space="preserve">
     <value>Brilho</value>
   </data>
diff --git a/Marechai.App/Styles/CDEColorPalette.xaml b/Marechai.App/Styles/CDEColorPalette.xaml
new file mode 100644
index 00000000..5981265c
--- /dev/null
+++ b/Marechai.App/Styles/CDEColorPalette.xaml
@@ -0,0 +1,219 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <!-- CDE (Common Desktop Environment) Theme -->
+    <!-- Classic teal/cyan title bars with beige/tan windows -->
+
+    <!-- System Accent - Black for icons on tan, Teal for selections -->
+    <Color x:Key="SystemAccentColor">#000000</Color> <Color x:Key="SystemAccentColorLight1">#333333</Color>
+    <Color x:Key="SystemAccentColorLight2">#666666</Color> <Color x:Key="SystemAccentColorLight3">#999999</Color>
+    <Color x:Key="SystemAccentColorDark1">#000000</Color> <Color x:Key="SystemAccentColorDark2">#000000</Color>
+    <Color x:Key="SystemAccentColorDark3">#000000</Color>
+
+    <!-- ALL TEXT - Black on Tan, White on Teal -->
+    <SolidColorBrush x:Key="TextFillColorPrimaryBrush"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="TextFillColorSecondaryBrush"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="TextFillColorTertiaryBrush"
+                     Color="#E0E0E0" />
+    <SolidColorBrush x:Key="TextFillColorDisabledBrush"
+                     Color="#888888" />
+    <SolidColorBrush x:Key="TextControlForeground"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="TextControlForegroundPointerOver"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="TextControlForegroundFocused"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="TextControlForegroundDisabled"
+                     Color="#888888" />
+    <SolidColorBrush x:Key="TextControlPlaceholderForeground"
+                     Color="#666666" />
+    <SolidColorBrush x:Key="TextControlPlaceholderForegroundPointerOver"
+                     Color="#777777" />
+    <SolidColorBrush x:Key="TextControlPlaceholderForegroundFocused"
+                     Color="#777777" />
+    <SolidColorBrush x:Key="TextControlHeaderForeground"
+                     Color="#5F9EA0" />
+
+    <!-- Button Text -->
+    <SolidColorBrush x:Key="ButtonForeground"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ButtonForegroundPointerOver"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ButtonForegroundPressed"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ButtonForegroundDisabled"
+                     Color="#888888" />
+
+    <!-- ComboBox Text -->
+    <SolidColorBrush x:Key="ComboBoxForeground"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ComboBoxForegroundPointerOver"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ComboBoxForegroundPressed"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ComboBoxForegroundFocused"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ComboBoxForegroundDisabled"
+                     Color="#888888" />
+
+    <!-- Navigation and List Text - White on Teal, Black on Tan -->
+    <SolidColorBrush x:Key="NavigationViewItemForeground"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="NavigationViewItemForegroundPointerOver"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="NavigationViewItemForegroundPressed"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="ListViewItemForeground"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ListViewItemForegroundPointerOver"
+                     Color="#000000" />
+    <SolidColorBrush x:Key="ListViewItemForegroundSelected"
+                     Color="#FFFFFF" />
+
+    <!-- Icon Colors - White on Teal Headers -->
+    <SolidColorBrush x:Key="IconElementForeground"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="FontIconForeground"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="SymbolIconForeground"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="GlyphBrush"
+                     Color="#FFFFFF" />
+
+    <!-- System Control Foreground - White on Teal -->
+    <SolidColorBrush x:Key="SystemControlForegroundBaseHighBrush"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="SystemControlForegroundBaseMediumBrush"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="SystemControlForegroundBaseMediumHighBrush"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="SystemControlForegroundBaseMediumLowBrush"
+                     Color="#E0E0E0" />
+    <SolidColorBrush x:Key="SystemControlForegroundBaseLowBrush"
+                     Color="#CCCCCC" />
+
+    <!-- System Colors - White on Teal -->
+    <SolidColorBrush x:Key="SystemBaseMediumColor"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="SystemBaseHighColor"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="SystemBaseMediumHighColor"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="SystemBaseMediumLowColor"
+                     Color="#E0E0E0" />
+    <SolidColorBrush x:Key="SystemBaseLowColor"
+                     Color="#CCCCCC" />
+
+    <!-- Backgrounds - CDE Tan/Beige Primary -->
+    <SolidColorBrush x:Key="ApplicationPageBackgroundThemeBrush"
+                     Color="#C8B698" />
+    <SolidColorBrush x:Key="LayerFillColorDefaultBrush"
+                     Color="#5F9EA0" />
+    <SolidColorBrush x:Key="LayerFillColorAltBrush"
+                     Color="#4A7F81" />
+    <SolidColorBrush x:Key="CardBackgroundFillColorDefaultBrush"
+                     Color="#5F9EA0" />
+    <SolidColorBrush x:Key="CardBackgroundFillColorSecondaryBrush"
+                     Color="#4A7F81" />
+    <SolidColorBrush x:Key="SurfaceFillColorDefaultBrush"
+                     Color="#D9C7B8" />
+    <SolidColorBrush x:Key="ControlFillColorDefaultBrush"
+                     Color="#D9C7B8" />
+    <SolidColorBrush x:Key="ControlFillColorSecondaryBrush"
+                     Color="#D0BEA8" />
+    <SolidColorBrush x:Key="ControlFillColorTertiaryBrush"
+                     Color="#C8B698" />
+    <SolidColorBrush x:Key="ControlFillColorDisabledBrush"
+                     Color="#B8A888" />
+    <SolidColorBrush x:Key="SubtleFillColorTransparentBrush"
+                     Color="Transparent" />
+    <SolidColorBrush x:Key="SubtleFillColorSecondaryBrush"
+                     Color="#D0BEA8" />
+    <SolidColorBrush x:Key="SubtleFillColorTertiaryBrush"
+                     Color="#C8B698" />
+
+    <!-- Button Backgrounds - Light Tan/Beige with 3D effect -->
+    <SolidColorBrush x:Key="ButtonBackground"
+                     Color="#D9C7B8" />
+    <SolidColorBrush x:Key="ButtonBackgroundPointerOver"
+                     Color="#E5D3C4" />
+    <SolidColorBrush x:Key="ButtonBackgroundPressed"
+                     Color="#C0AE98" />
+    <SolidColorBrush x:Key="ButtonBackgroundDisabled"
+                     Color="#B8A888" />
+
+    <!-- TextBox Backgrounds - White/Very Light Tan -->
+    <SolidColorBrush x:Key="TextControlBackground"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="TextControlBackgroundPointerOver"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="TextControlBackgroundFocused"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="TextControlBackgroundDisabled"
+                     Color="#E8E8E8" />
+
+    <!-- ComboBox Backgrounds -->
+    <SolidColorBrush x:Key="ComboBoxBackground"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="ComboBoxBackgroundPointerOver"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="ComboBoxBackgroundPressed"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="ComboBoxBackgroundFocused"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="ComboBoxBackgroundDisabled"
+                     Color="#E8E8E8" />
+
+    <!-- Navigation Backgrounds - Teal like title bars -->
+    <SolidColorBrush x:Key="NavigationViewDefaultPaneBackground"
+                     Color="#5F9EA0" />
+    <SolidColorBrush x:Key="NavigationViewTopPaneBackground"
+                     Color="#5F9EA0" />
+    <SolidColorBrush x:Key="NavigationViewExpandedPaneBackground"
+                     Color="#5F9EA0" />
+
+    <!-- List Backgrounds - White items -->
+    <SolidColorBrush x:Key="ListViewItemBackground"
+                     Color="#FFFFFF" />
+    <SolidColorBrush x:Key="ListViewItemBackgroundPointerOver"
+                     Color="#E8E8E8" />
+    <SolidColorBrush x:Key="ListViewItemBackgroundPressed"
+                     Color="#D0D0D0" />
+    <SolidColorBrush x:Key="ListViewItemBackgroundSelected"
+                     Color="#5F9EA0" />
+    <SolidColorBrush x:Key="ListViewItemBackgroundSelectedPointerOver"
+                     Color="#7FB3B5" />
+
+    <!-- Borders - Dark Gray -->
+    <SolidColorBrush x:Key="CardStrokeColorDefaultBrush"
+                     Color="#666666" />
+    <SolidColorBrush x:Key="ControlStrokeColorDefaultBrush"
+                     Color="#666666" />
+    <SolidColorBrush x:Key="ControlStrokeColorSecondaryBrush"
+                     Color="#888888" />
+    <SolidColorBrush x:Key="DividerStrokeColorDefaultBrush"
+                     Color="#999999" />
+    <SolidColorBrush x:Key="TextControlBorderBrush"
+                     Color="#666666" />
+    <SolidColorBrush x:Key="TextControlBorderBrushPointerOver"
+                     Color="#666666" />
+    <SolidColorBrush x:Key="TextControlBorderBrushFocused"
+                     Color="#5F9EA0" />
+    <SolidColorBrush x:Key="ComboBoxBorderBrush"
+                     Color="#666666" />
+    <SolidColorBrush x:Key="ComboBoxBorderBrushPointerOver"
+                     Color="#666666" />
+    <SolidColorBrush x:Key="ComboBoxBorderBrushPressed"
+                     Color="#5F9EA0" />
+
+    <!-- Accent Colors -->
+    <SolidColorBrush x:Key="AccentFillColorDefaultBrush"
+                     Color="#5F9EA0" />
+    <SolidColorBrush x:Key="AccentFillColorSecondaryBrush"
+                     Color="#7FB3B5" />
+    <SolidColorBrush x:Key="AccentFillColorTertiaryBrush"
+                     Color="#9FC8CA" />
+
+</ResourceDictionary>
\ No newline at end of file