diff --git a/src/AdvancedCalculator/Views/MainView.axaml b/src/AdvancedCalculator/Views/MainView.axaml
index 2d8e208..3b5bbb7 100644
--- a/src/AdvancedCalculator/Views/MainView.axaml
+++ b/src/AdvancedCalculator/Views/MainView.axaml
@@ -9,156 +9,156 @@
              x:Class="AdvancedCalculator.Views.MainView"
              x:DataType="vm:MainViewModel"
              x:Name="Root">
-  <UserControl.Resources>
-    <conv:BoolToGridLengthConverter x:Key="BoolToGridLengthConverter" />
-    <conv:WidthToBooleanConverter x:Key="WidthToBooleanConverter" />
-    <conv:IsZeroConverter x:Key="IsZeroConverter" />
-    <conv:WidthToSplitViewModeConverter x:Key="WidthToSplitViewModeConverter" />
-    <conv:WidthToPaneOpenConverter x:Key="WidthToPaneOpenConverter" />
-  </UserControl.Resources>
-  <!-- Replace columns with a responsive SplitView -->
-  <SplitView x:Name="RootSplit"
-             OpenPaneLength="320"
-             CompactPaneLength="0"
-             DisplayMode="{Binding $parent[Window].Bounds.Width, Converter={StaticResource WidthToSplitViewModeConverter}, ConverterParameter=640}"
-             IsPaneOpen="{Binding $parent[Window].Bounds.Width, Converter={StaticResource WidthToPaneOpenConverter}, ConverterParameter=640}">
+	<UserControl.Resources>
+		<conv:BoolToGridLengthConverter x:Key="BoolToGridLengthConverter" />
+		<conv:WidthToBooleanConverter x:Key="WidthToBooleanConverter" />
+		<conv:IsZeroConverter x:Key="IsZeroConverter" />
+		<conv:WidthToSplitViewModeConverter x:Key="WidthToSplitViewModeConverter" />
+		<conv:WidthToPaneOpenConverter x:Key="WidthToPaneOpenConverter" />
+	</UserControl.Resources>
+	<!-- Replace columns with a responsive SplitView -->
+	<SplitView x:Name="RootSplit"
+			   OpenPaneLength="320"
+			   CompactPaneLength="0"
+			   DisplayMode="{Binding $parent[Window].Bounds.Width, Converter={StaticResource WidthToSplitViewModeConverter}, ConverterParameter=640}"
+			   IsPaneOpen="{Binding $parent[Window].Bounds.Width, Converter={StaticResource WidthToPaneOpenConverter}, ConverterParameter=640}">
 
-    <!-- Left pane: Variables + Functions -->
-    <SplitView.Pane>
-      <Grid>
-        <Grid.RowDefinitions>
-          <RowDefinition Height="*" />
-          <RowDefinition Height="{Binding IsFunctionsPanelOpen, Converter={StaticResource BoolToGridLengthConverter}}" />
-        </Grid.RowDefinitions>
+		<!-- Left pane: Variables + Functions -->
+		<SplitView.Pane>
+			<Grid>
+				<Grid.RowDefinitions>
+					<RowDefinition Height="*" />
+					<RowDefinition Height="{Binding IsFunctionsPanelOpen, Converter={StaticResource BoolToGridLengthConverter}}" />
+				</Grid.RowDefinitions>
 
-        <!-- Variables list with empty-state hint overlay -->
-        <Grid Grid.Row="0">
-          <ListBox ItemsSource="{Binding Variables}" SelectedIndex="-1"
-                   AutomationProperties.Name="Variables list">
-            <ListBox.ItemTemplate>
-              <DataTemplate x:DataType="m:VariableItem">
-                <Button Background="Transparent" BorderThickness="0" Padding="8" MinHeight="44"
-                        x:DataType="vm:MainViewModel"
-                        DataContext="{Binding $parent[UserControl].DataContext}"
-                        AutomationProperties.Name="Insert variable"
-                        Command="{Binding InsertVariableCommand}"
-                        CommandParameter="{Binding DataContext.VariableName, RelativeSource={RelativeSource AncestorType=ListBoxItem}}">
-                  <Grid ColumnDefinitions="Auto,*,Auto"
-                        DataContext="{Binding $parent[ListBoxItem].DataContext}"
-                        x:DataType="m:VariableItem">
-                    <TextBlock Grid.Column="0" FontFamily="{StaticResource MDI}"
-                               FontSize="{DynamicResource IconSizeM}" Text="{Binding Icon}" VerticalAlignment="Center" Margin="0,0,8,0" />
-                    <TextBlock Grid.Column="1" Text="{Binding VariableName}" FontWeight="Bold" VerticalAlignment="Center" />
-                    <StackPanel Grid.Column="2" Spacing="6" VerticalAlignment="Center">
-                      <TextBlock Text="{Binding Value}" />
-                      <TextBlock IsVisible="{Binding IsExpression}" Text="{Binding ExpressionComputation}" FontStyle="Italic" />
-                    </StackPanel>
-                  </Grid>
-                </Button>
-              </DataTemplate>
-            </ListBox.ItemTemplate>
-          </ListBox>
-          <TextBlock Text="No variables yet. Define with: x = 5"
-                     IsVisible="{Binding Variables.Count, Converter={StaticResource IsZeroConverter}}"
-                     IsHitTestVisible="False"
-                     Opacity="0.6"
-                     HorizontalAlignment="Center" VerticalAlignment="Center" />
-        </Grid>
+				<!-- Variables list with empty-state hint overlay -->
+				<Grid Grid.Row="0">
+					<ListBox ItemsSource="{Binding Variables}" SelectedIndex="-1"
+							 AutomationProperties.Name="Variables list">
+						<ListBox.ItemTemplate>
+							<DataTemplate x:DataType="m:VariableItem">
+								<Button Background="Transparent" BorderThickness="0" Padding="8" MinHeight="44"
+          AutomationProperties.Name="Insert variable"
+          Command="{Binding #Root.DataContext.InsertVariableCommand}"
+          CommandParameter="{Binding VariableName}">
+									<Grid ColumnDefinitions="Auto,*,Auto"
+										  DataContext="{Binding $parent[ListBoxItem].DataContext}"
+										  x:DataType="m:VariableItem">
+										<TextBlock Grid.Column="0" FontFamily="{StaticResource MDI}"
+												   FontSize="{DynamicResource IconSizeM}" Text="{Binding Icon}" Margin="0,0,8,0" />
+										<TextBlock Grid.Column="1" Text="{Binding VariableName}" FontWeight="Bold" />
+										<StackPanel Grid.Column="2" Spacing="6">
+											<TextBlock Text="{Binding Value}" />
+											<TextBlock IsVisible="{Binding IsExpression}" Text="{Binding ExpressionComputation}" FontStyle="Italic" />
+										</StackPanel>
+									</Grid>
+								</Button>
+							</DataTemplate>
 
-        <!-- Function definitions -->
-        <ListBox Grid.Row="1" BorderThickness="0"
-                 ItemsSource="{x:Static m:FunctionDefinitionItem.DefinedFunctions}"
-                 AutomationProperties.Name="Functions list">
-            <ListBox.ItemTemplate>
-              <DataTemplate x:DataType="m:FunctionDefinitionItem">
-                <Button Background="Transparent" BorderThickness="0" Padding="8" MinHeight="44"
-                        x:DataType="vm:MainViewModel"
-                        DataContext="{Binding $parent[UserControl].DataContext}"
-                        AutomationProperties.Name="Insert function"
-                        Command="{Binding InsertFunctionCommand}"
-                        CommandParameter="{Binding DataContext.FunctionName, RelativeSource={RelativeSource AncestorType=ListBoxItem}}">
-                  <StackPanel Spacing="8"
-                              DataContext="{Binding $parent[ListBoxItem].DataContext}"
-                              x:DataType="m:FunctionDefinitionItem">
-                    <StackPanel Orientation="Horizontal" Spacing="8" VerticalAlignment="Center">
-                      <TextBlock FontFamily="{StaticResource MDI}" Text="{Binding Icon}" />
-                      <TextBlock Text="{Binding FunctionName}" FontWeight="Bold" />
-                    </StackPanel>
-                    <TextBlock Text="{Binding FunctionDescription}" FontStyle="Italic" TextWrapping="Wrap" />
-                    <ItemsControl ItemsSource="{Binding FunctionArguments}">
-                      <ItemsControl.ItemTemplate>
-                        <DataTemplate>
-                          <StackPanel>
-                            <TextBlock Text="{Binding Key}" />
-                            <TextBlock Text="{Binding Value}" FontStyle="Italic" Margin="8,0,0,0" />
-                          </StackPanel>
-                        </DataTemplate>
-                      </ItemsControl.ItemTemplate>
-                    </ItemsControl>
-                  </StackPanel>
-                </Button>
-              </DataTemplate>
-          </ListBox.ItemTemplate>
-        </ListBox>
-      </Grid>
-    </SplitView.Pane>
+						</ListBox.ItemTemplate>
+					</ListBox>
+					<TextBlock Text="No variables yet. Define with: x = 5"
+							   IsVisible="{Binding Variables.Count, Converter={StaticResource IsZeroConverter}}"
+							   IsHitTestVisible="False"
+							   Opacity="0.6"
+							   HorizontalAlignment="Center" VerticalAlignment="Center" />
+				</Grid>
 
-    <!-- Right content: History + Input -->
-    <SplitView.Content>
-      <Grid RowDefinitions="*,Auto">
-        <!-- History -->
-        <Grid Grid.Row="0">
-          <ListBox ItemsSource="{Binding History}" SelectedIndex="{Binding SelectedHistoryIndex}"
-                   AutomationProperties.Name="History list">
-            <ListBox.ItemTemplate>
-              <DataTemplate x:DataType="m:HistoryItem">
-                <Grid ColumnDefinitions="Auto,*" Margin="4,2">
-                <TextBlock FontFamily="{StaticResource MDI}" Text="{x:Static m:IconFont.ArrowRightDropCircle}"
-                           FontSize="{DynamicResource IconSizeM}" VerticalAlignment="Center" Margin="0,0,8,0" />
-                  <StackPanel Grid.Column="1">
-                    <TextBlock Text="{Binding Input}" MaxLines="3" />
-                    <TextBlock Text="{Binding Output}" FontWeight="Bold" MaxLines="2" />
-                  </StackPanel>
-                </Grid>
-              </DataTemplate>
-            </ListBox.ItemTemplate>
-          </ListBox>
-          <TextBlock Text="No history yet. Enter an expression and Evaluate."
-                     IsVisible="{Binding History.Count, Converter={StaticResource IsZeroConverter}}"
-                     IsHitTestVisible="False"
-                     Opacity="0.6"
-                     HorizontalAlignment="Center" VerticalAlignment="Center" />
-        </Grid>
+				<!-- Function definitions -->
+				<ListBox Grid.Row="1" BorderThickness="0"
+						 ItemsSource="{x:Static m:FunctionDefinitionItem.DefinedFunctions}"
+						 AutomationProperties.Name="Functions list">
+					<ListBox.ItemTemplate>
+						<DataTemplate x:DataType="m:FunctionDefinitionItem">
+							<Button x:DataType="vm:MainViewModel"
+									DataContext="{Binding #Root.DataContext}"
+									Background="Transparent" BorderThickness="0" Padding="8" MinHeight="44"
+									AutomationProperties.Name="Insert function"
+									Command="{Binding InsertFunctionCommand}"
+									CommandParameter="{Binding FunctionName, RelativeSource={RelativeSource AncestorType=ListBoxItem}}">
+								<StackPanel Spacing="8"
+											DataContext="{Binding $parent[ListBoxItem].DataContext}"
+											x:DataType="m:FunctionDefinitionItem">
+									<StackPanel Orientation="Horizontal" Spacing="8">
+										<TextBlock FontFamily="{StaticResource MDI}" Text="{Binding Icon}" />
+										<TextBlock Text="{Binding FunctionName}" FontWeight="Bold" />
+									</StackPanel>
+									<TextBlock Text="{Binding FunctionDescription}" FontStyle="Italic" TextWrapping="Wrap" />
+									<ItemsControl ItemsSource="{Binding FunctionArguments}">
+										<ItemsControl.ItemTemplate>
+											<DataTemplate>
+												<StackPanel>
+													<TextBlock Text="{Binding Key}" />
+													<TextBlock Text="{Binding Value}" FontStyle="Italic" Margin="8,0,0,0" />
+												</StackPanel>
+											</DataTemplate>
+										</ItemsControl.ItemTemplate>
+									</ItemsControl>
+								</StackPanel>
+							</Button>
+						</DataTemplate>
 
-        <!-- Input Row -->
-        <Grid Grid.Row="1" ColumnDefinitions="Auto,Auto,*,Auto" Margin="4">
-          <!-- Pane toggle: visible on narrow only -->
-          <ToggleButton Margin="0,0,6,0"
-                        IsVisible="{Binding $parent[Window].Bounds.Width,
+					</ListBox.ItemTemplate>
+				</ListBox>
+			</Grid>
+		</SplitView.Pane>
+
+		<!-- Right content: History + Input -->
+		<SplitView.Content>
+			<Grid RowDefinitions="*,Auto">
+				<!-- History -->
+				<Grid Grid.Row="0">
+					<ListBox ItemsSource="{Binding History}" SelectedIndex="{Binding SelectedHistoryIndex}"
+							 AutomationProperties.Name="History list">
+						<ListBox.ItemTemplate>
+							<DataTemplate x:DataType="m:HistoryItem">
+								<Grid ColumnDefinitions="Auto,*" Margin="4,2">
+									<TextBlock FontFamily="{StaticResource MDI}" Text="{x:Static m:IconFont.ArrowRightDropCircle}"
+											   FontSize="{DynamicResource IconSizeM}" VerticalAlignment="Center" Margin="0,0,8,0" />
+									<StackPanel Grid.Column="1">
+										<TextBlock Text="{Binding Input}" MaxLines="3" />
+										<TextBlock Text="{Binding Output}" FontWeight="Bold" MaxLines="2" />
+									</StackPanel>
+								</Grid>
+							</DataTemplate>
+						</ListBox.ItemTemplate>
+					</ListBox>
+					<TextBlock Text="No history yet. Enter an expression and Evaluate."
+							   IsVisible="{Binding History.Count, Converter={StaticResource IsZeroConverter}}"
+							   IsHitTestVisible="False"
+							   Opacity="0.6"
+							   HorizontalAlignment="Center" VerticalAlignment="Center" />
+				</Grid>
+
+				<!-- Input Row -->
+				<Grid Grid.Row="1" ColumnDefinitions="Auto,Auto,*,Auto" Margin="4">
+					<!-- Pane toggle: visible on narrow only -->
+					<ToggleButton Margin="0,0,6,0"
+								  IsVisible="{Binding $parent[Window].Bounds.Width,
                                             Converter={StaticResource WidthToBooleanConverter},
                                             ConverterParameter=640}"
-                        IsChecked="{Binding #RootSplit.IsPaneOpen}"
-                        AutomationProperties.Name="Open side panel">
-            <TextBlock Text="≡" FontSize="18"/>
-          </ToggleButton>
+								  IsChecked="{Binding #RootSplit.IsPaneOpen}"
+								  AutomationProperties.Name="Open side panel">
+						<TextBlock Text="≡" FontSize="18"/>
+					</ToggleButton>
 
-          <!-- Toggle functions panel inside the pane -->
-          <Button Grid.Column="1" Command="{Binding ToggleFunctionsCommand}" Margin="0,0,6,0" MinHeight="40" MinWidth="40"
-                  AutomationProperties.Name="Toggle functions panel">
-            <TextBlock FontFamily="{StaticResource MDI}" Text="{x:Static m:IconFont.Function}" />
-          </Button>
+					<!-- Toggle functions panel inside the pane -->
+					<Button Grid.Column="1" Command="{Binding ToggleFunctionsCommand}" Margin="0,0,6,0" MinHeight="40" MinWidth="40"
+							AutomationProperties.Name="Toggle functions panel">
+						<TextBlock FontFamily="{StaticResource MDI}" Text="{x:Static m:IconFont.Function}" />
+					</Button>
 
-          <TextBox Grid.Column="2" Text="{Binding InputText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" MinHeight="44"
-                   AutomationProperties.Name="Expression input"
-                   Watermark="Type an expression (e.g., 2 + 2)"/>
-          
-          <!-- Explicit evaluate button for touch -->
-          <Button Grid.Column="3" Command="{Binding SubmitCommand}" MinHeight="44" Padding="16,8"
-                  AutomationProperties.Name="Evaluate">
-            <TextBlock Text="Evaluate"/>
-          </Button>
-        </Grid>
-      </Grid>
-    </SplitView.Content>
-  </SplitView>
+					<TextBox Grid.Column="2" Text="{Binding InputText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" MinHeight="44"
+							 AutomationProperties.Name="Expression input"
+							 Watermark="Type an expression (e.g., 2 + 2)"/>
+
+					<!-- Explicit evaluate button for touch -->
+					<Button Grid.Column="3" Command="{Binding SubmitCommand}" MinHeight="44" Padding="16,8"
+							AutomationProperties.Name="Evaluate">
+						<TextBlock Text="Evaluate"/>
+					</Button>
+				</Grid>
+			</Grid>
+		</SplitView.Content>
+	</SplitView>
 </UserControl>