diff --git a/src/AdvancedCalculator.Android/Styles/Android.axaml b/src/AdvancedCalculator.Android/Styles/Android.axaml
deleted file mode 100644
index 30f7e04..0000000
--- a/src/AdvancedCalculator.Android/Styles/Android.axaml
+++ /dev/null
@@ -1,17 +0,0 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
-                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-  <!-- Android overrides: larger, touch-first -->
-  <x:Double x:Key="FontSizeBase">16</x:Double>
-  <x:Double x:Key="FontSizeLarge">18</x:Double>
-  <x:Double x:Key="IconSizeM">24</x:Double>
-  <x:Double x:Key="LineHeightBase">1.35</x:Double>
-
-  <!-- Thin overlay-like scrollbars -->
-  <Style Selector="ScrollBar:vertical">
-    <Setter Property="Width" Value="8"/>
-  </Style>
-  <Style Selector="ScrollBar:horizontal">
-    <Setter Property="Height" Value="8"/>
-  </Style>
-</ResourceDictionary>
-
diff --git a/src/AdvancedCalculator.Browser/Styles/Browser.axaml b/src/AdvancedCalculator.Browser/Styles/Browser.axaml
deleted file mode 100644
index 3842c71..0000000
--- a/src/AdvancedCalculator.Browser/Styles/Browser.axaml
+++ /dev/null
@@ -1,16 +0,0 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
-                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-  <!-- Browser overrides: middle ground -->
-  <x:Double x:Key="FontSizeBase">15</x:Double>
-  <x:Double x:Key="IconSizeM">22</x:Double>
-  <x:Double x:Key="LineHeightBase">1.3</x:Double>
-
-  <!-- Slightly thinner scrollbars on web -->
-  <Style Selector="ScrollBar:vertical">
-    <Setter Property="Width" Value="8"/>
-  </Style>
-  <Style Selector="ScrollBar:horizontal">
-    <Setter Property="Height" Value="8"/>
-  </Style>
-</ResourceDictionary>
-
diff --git a/src/AdvancedCalculator.Desktop/Styles/Desktop.axaml b/src/AdvancedCalculator.Desktop/Styles/Desktop.axaml
deleted file mode 100644
index 7a951d8..0000000
--- a/src/AdvancedCalculator.Desktop/Styles/Desktop.axaml
+++ /dev/null
@@ -1,16 +0,0 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
-                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-  <!-- Desktop overrides: slightly denser -->
-  <x:Double x:Key="FontSizeBase">13</x:Double>
-  <x:Double x:Key="LineHeightBase">1.2</x:Double>
-  <x:Double x:Key="IconSizeM">20</x:Double>
-
-  <!-- Scrollbars a bit thicker on desktop -->
-  <Style Selector="ScrollBar:vertical">
-    <Setter Property="Width" Value="12"/>
-  </Style>
-  <Style Selector="ScrollBar:horizontal">
-    <Setter Property="Height" Value="12"/>
-  </Style>
-</ResourceDictionary>
-
diff --git a/src/AdvancedCalculator/App.axaml b/src/AdvancedCalculator/App.axaml
index 8d7bed3..5e686cd 100644
--- a/src/AdvancedCalculator/App.axaml
+++ b/src/AdvancedCalculator/App.axaml
@@ -6,8 +6,6 @@
 
     <Application.Styles>
         <FluentTheme />
-        <StyleInclude Source="avares://AdvancedCalculator/Styles/Typography.axaml"/>
-        <StyleInclude Source="avares://AdvancedCalculator/Styles/Scroll.axaml"/>
     </Application.Styles>
 
     <Application.Resources>
diff --git a/src/AdvancedCalculator/App.axaml.cs b/src/AdvancedCalculator/App.axaml.cs
index 32716eb..e967b3b 100644
--- a/src/AdvancedCalculator/App.axaml.cs
+++ b/src/AdvancedCalculator/App.axaml.cs
@@ -5,8 +5,6 @@ using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Data.Core.Plugins;
 using Avalonia.Markup.Xaml;
-using Avalonia.Styling;
-using System;
 
 namespace AdvancedCalculator;
 
@@ -23,40 +21,6 @@ public partial class App : Application
         // Without this line you will get duplicate validations from both Avalonia and CT
         BindingPlugins.DataValidators.RemoveAt(0);
 
-        // Load platform-specific styles (typography, scrollbars overrides)
-        try
-        {
-            var styles = Current?.Styles;
-            if (styles is not null)
-            {
-                if (OperatingSystem.IsAndroid())
-                {
-                    styles.Add(new StyleInclude(new Uri("avares://AdvancedCalculator/"))
-                    {
-                        Source = new Uri("avares://AdvancedCalculator.Android/Styles/Android.axaml")
-                    });
-                }
-                else if (OperatingSystem.IsBrowser())
-                {
-                    styles.Add(new StyleInclude(new Uri("avares://AdvancedCalculator/"))
-                    {
-                        Source = new Uri("avares://AdvancedCalculator.Browser/Styles/Browser.axaml")
-                    });
-                }
-                else
-                {
-                    styles.Add(new StyleInclude(new Uri("avares://AdvancedCalculator/"))
-                    {
-                        Source = new Uri("avares://AdvancedCalculator.Desktop/Styles/Desktop.axaml")
-                    });
-                }
-            }
-        }
-        catch
-        {
-            // If a platform-specific style dictionary is missing, continue without failing.
-        }
-
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
             desktop.MainWindow = new MainWindow
diff --git a/src/AdvancedCalculator/Converters/WidthToBooleanConverter.cs b/src/AdvancedCalculator/Converters/WidthToBooleanConverter.cs
deleted file mode 100644
index 6efa5f6..0000000
--- a/src/AdvancedCalculator/Converters/WidthToBooleanConverter.cs
+++ /dev/null
@@ -1,31 +0,0 @@
-using System;
-using System.Globalization;
-using Avalonia.Data.Converters;
-
-namespace AdvancedCalculator.Converters;
-
-// Returns true if width (double) is less than the provided threshold (parameter),
-// otherwise false. Default threshold is 640 when parameter is null or invalid.
-public class WidthToBooleanConverter : IValueConverter
-{
-    public static readonly WidthToBooleanConverter Instance = new();
-
-    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo? culture)
-    {
-        if (value is double width)
-        {
-            double threshold = 640;
-            if (parameter is double p)
-                threshold = p;
-            else if (parameter is string s && double.TryParse(s, NumberStyles.Number, CultureInfo.InvariantCulture, out var parsed))
-                threshold = parsed;
-
-            return width < threshold;
-        }
-        return false;
-    }
-
-    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo? culture)
-        => throw new NotSupportedException();
-}
-
diff --git a/src/AdvancedCalculator/Styles/Scroll.axaml b/src/AdvancedCalculator/Styles/Scroll.axaml
deleted file mode 100644
index ea9284d..0000000
--- a/src/AdvancedCalculator/Styles/Scroll.axaml
+++ /dev/null
@@ -1,21 +0,0 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
-                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-  <!-- Shared scrolling defaults -->
-  <Style Selector="ListBox">
-    <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
-    <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled"/>
-  </Style>
-
-  <Style Selector="ScrollViewer">
-    <Setter Property="CanScrollHorizontally" Value="False"/>
-  </Style>
-
-  <!-- Thin-ish scrollbars by default; platform overrides will adjust -->
-  <Style Selector="ScrollBar:vertical">
-    <Setter Property="Width" Value="10"/>
-  </Style>
-  <Style Selector="ScrollBar:horizontal">
-    <Setter Property="Height" Value="10"/>
-  </Style>
-</ResourceDictionary>
-
diff --git a/src/AdvancedCalculator/Styles/Typography.axaml b/src/AdvancedCalculator/Styles/Typography.axaml
deleted file mode 100644
index eb80272..0000000
--- a/src/AdvancedCalculator/Styles/Typography.axaml
+++ /dev/null
@@ -1,30 +0,0 @@
-<ResourceDictionary xmlns="https://github.com/avaloniaui"
-                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-  <!-- Shared typography resources -->
-  <x:Double x:Key="FontSizeSmall">12</x:Double>
-  <x:Double x:Key="FontSizeBase">14</x:Double>
-  <x:Double x:Key="FontSizeLarge">16</x:Double>
-  <x:Double x:Key="FontSizeXL">20</x:Double>
-
-  <x:Double x:Key="IconSizeS">18</x:Double>
-  <x:Double x:Key="IconSizeM">22</x:Double>
-  <x:Double x:Key="IconSizeL">26</x:Double>
-
-  <x:Double x:Key="LineHeightTight">1.1</x:Double>
-  <x:Double x:Key="LineHeightBase">1.25</x:Double>
-  <x:Double x:Key="LineHeightRelaxed">1.4</x:Double>
-
-  <!-- Defaults for text -->
-  <Style Selector="TextBlock">
-    <Setter Property="TextElement.FontSize" Value="{DynamicResource FontSizeBase}"/>
-    <Setter Property="TextWrapping" Value="Wrap"/>
-    <Setter Property="LineHeight" Value="{DynamicResource LineHeightBase}"/>
-  </Style>
-
-  <!-- Subtle caption text helper -->
-  <Style Selector="TextBlock.caption">
-    <Setter Property="TextElement.FontSize" Value="{DynamicResource FontSizeSmall}"/>
-    <Setter Property="Opacity" Value="0.85"/>
-  </Style>
-</ResourceDictionary>
-
diff --git a/src/AdvancedCalculator/ViewModels/MainViewModel.cs b/src/AdvancedCalculator/ViewModels/MainViewModel.cs
index 7be1cf6..1611402 100644
--- a/src/AdvancedCalculator/ViewModels/MainViewModel.cs
+++ b/src/AdvancedCalculator/ViewModels/MainViewModel.cs
@@ -41,37 +41,6 @@ public partial class MainViewModel : ViewModelBase
         IsFunctionsPanelOpen = !IsFunctionsPanelOpen;
     }
 
-    // Insert helpers for touch: appends tokens to the input box
-    [RelayCommand]
-    private void InsertVariable(string? variableName)
-    {
-        if (string.IsNullOrWhiteSpace(variableName))
-            return;
-        InsertToken(variableName);
-    }
-
-    [RelayCommand]
-    private void InsertFunction(string? functionName)
-    {
-        if (string.IsNullOrWhiteSpace(functionName))
-            return;
-        InsertToken(functionName + "()");
-    }
-
-    private void InsertToken(string token)
-    {
-        if (string.IsNullOrEmpty(InputText))
-        {
-            InputText = token;
-            return;
-        }
-
-        if (!char.IsWhiteSpace(InputText[^1]))
-            InputText += " ";
-
-        InputText += token;
-    }
-
     [RelayCommand(AllowConcurrentExecutions = false)]
     private async Task Submit()
     {
diff --git a/src/AdvancedCalculator/Views/MainView.axaml b/src/AdvancedCalculator/Views/MainView.axaml
index d5fc5e7..71ffac9 100644
--- a/src/AdvancedCalculator/Views/MainView.axaml
+++ b/src/AdvancedCalculator/Views/MainView.axaml
@@ -10,184 +10,92 @@
              x:DataType="vm:MainViewModel">
   <UserControl.Resources>
     <conv:BoolToGridLengthConverter x:Key="BoolToGridLengthConverter" />
-    <conv:WidthToBooleanConverter x:Key="WidthToBooleanConverter" />
   </UserControl.Resources>
-  <!-- Replace columns with a responsive SplitView -->
-  <SplitView x:Name="RootSplit"
-             OpenPaneLength="320"
-             CompactPaneLength="0">
-    <!-- Responsive behavior: set DisplayMode and IsPaneOpen based on width -->
-    <SplitView.Styles>
-      <Style Selector="SplitView#RootSplit">
-        <Style.Triggers>
-          <!-- Narrow: Overlay mode, pane closed by default -->
-          <DataTrigger Value="True"
-                       Binding="{Binding $parent[Window].Bounds.Width,
-                                         Converter={StaticResource WidthToBooleanConverter},
-                                         ConverterParameter=640}">
-            <Setter Property="DisplayMode" Value="Overlay" />
-            <Setter Property="IsPaneOpen" Value="False" />
-          </DataTrigger>
-          <!-- Wide: Inline mode, pane open -->
-          <DataTrigger Value="False"
-                       Binding="{Binding $parent[Window].Bounds.Width,
-                                         Converter={StaticResource WidthToBooleanConverter},
-                                         ConverterParameter=640}">
-            <Setter Property="DisplayMode" Value="Inline" />
-            <Setter Property="IsPaneOpen" Value="True" />
-          </DataTrigger>
-        </Style.Triggers>
-      </Style>
-    </SplitView.Styles>
 
-    <!-- Left pane: Variables + Functions -->
-    <SplitView.Pane>
-      <Grid>
-        <Grid.RowDefinitions>
-          <RowDefinition Height="*" />
-          <RowDefinition Height="{Binding IsFunctionsPanelOpen, Converter={StaticResource BoolToGridLengthConverter}}" />
-        </Grid.RowDefinitions>
+  <Grid ColumnDefinitions="*,3*">
+    <!-- Left column: Variables + Functions -->
+    <Grid Grid.Column="0">
+      <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" HorizontalContentAlignment="Stretch"
-                   AutomationProperties.Name="Variables list">
-            <ListBox.ItemTemplate>
-              <DataTemplate x:DataType="m:VariableItem">
-                <Button Command="{Binding DataContext.InsertVariableCommand, RelativeSource={RelativeSource AncestorType=UserControl}}"
-                        CommandParameter="{Binding VariableName}"
-                        Background="Transparent" BorderThickness="0" Padding="8" MinHeight="44"
-                        AutomationProperties.Name="Insert variable">
-                  <Grid ColumnDefinitions="Auto,*,Auto">
-                <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" />
+      <!-- Variables list -->
+      <ListBox Grid.Row="0" ItemsSource="{Binding Variables}" SelectedIndex="-1">
+        <ListBox.ItemTemplate>
+          <DataTemplate x:DataType="m:VariableItem">
+            <Grid ColumnDefinitions="Auto,*,Auto" Margin="4,2">
+              <TextBlock Grid.Column="0" FontFamily="{StaticResource MDI}"
+                         FontSize="22" 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="2">
+                <TextBlock Text="{Binding Value}" />
+                <TextBlock IsVisible="{Binding IsExpression}" Text="{Binding ExpressionComputation}" FontStyle="Italic" />
+              </StackPanel>
+            </Grid>
+          </DataTemplate>
+        </ListBox.ItemTemplate>
+      </ListBox>
+
+      <!-- Function definitions -->
+      <ListBox Grid.Row="1" BorderThickness="0"
+               ItemsSource="{x:Static m:FunctionDefinitionItem.DefinedFunctions}">
+        <ListBox.ItemTemplate>
+          <DataTemplate x:DataType="m:FunctionDefinitionItem">
+            <StackPanel Spacing="2" Margin="4,6">
+              <StackPanel Orientation="Horizontal" Spacing="6">
+                <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>
-                  </Grid>
-                </Button>
-              </DataTemplate>
-            </ListBox.ItemTemplate>
-          </ListBox>
-          <TextBlock Text="No variables yet. Define with: x = 5"
-                     IsVisible="False"
-                     IsHitTestVisible="False"
-                     Opacity="0.6"
-                     HorizontalAlignment="Center" VerticalAlignment="Center">
-            <TextBlock.Styles>
-              <Style Selector="TextBlock">
-                <Style.Triggers>
-                  <DataTrigger Binding="{Binding Variables.Count}" Value="0">
-                    <Setter Property="IsVisible" Value="True" />
-                  </DataTrigger>
-                </Style.Triggers>
-              </Style>
-            </TextBlock.Styles>
-          </TextBlock>
-        </Grid>
+                  </DataTemplate>
+                </ItemsControl.ItemTemplate>
+              </ItemsControl>
+            </StackPanel>
+          </DataTemplate>
+        </ListBox.ItemTemplate>
+      </ListBox>
+    </Grid>
 
-        <!-- Function definitions -->
-        <ListBox Grid.Row="1" BorderThickness="0" HorizontalContentAlignment="Stretch"
-                 ItemsSource="{x:Static m:FunctionDefinitionItem.DefinedFunctions}"
-                 AutomationProperties.Name="Functions list">
-          <ListBox.ItemTemplate>
-            <DataTemplate x:DataType="m:FunctionDefinitionItem">
-              <Button Command="{Binding DataContext.InsertFunctionCommand, RelativeSource={RelativeSource AncestorType=UserControl}}"
-                      CommandParameter="{Binding FunctionName}"
-                      Background="Transparent" BorderThickness="0" Padding="8" MinHeight="44"
-                      AutomationProperties.Name="Insert function">
-                <StackPanel Spacing="8">
-                  <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>
+    <!-- GridSplitter between columns -->
+    <GridSplitter Grid.Column="0" HorizontalAlignment="Right" Width="5" Background="Transparent" />
+
+    <!-- Right column: History + Input -->
+    <Grid Grid.Column="1" RowDefinitions="*,Auto">
+      <!-- History -->
+      <ListBox Grid.Row="0" ItemsSource="{Binding History}" SelectedIndex="{Binding SelectedHistoryIndex}">
+        <ListBox.ItemTemplate>
+          <DataTemplate x:DataType="m:HistoryItem">
+            <Grid ColumnDefinitions="Auto,*" Margin="4,2">
+              <TextBlock FontFamily="{StaticResource MDI}" Text="{x:Static m:IconFont.ArrowRightDropCircle}"
+                         FontSize="22" VerticalAlignment="Center" Margin="0,0,8,0" />
+              <StackPanel Grid.Column="1">
+                <TextBlock Text="{Binding Input}" />
+                <TextBlock Text="{Binding Output}" FontWeight="Bold" />
+              </StackPanel>
+            </Grid>
+          </DataTemplate>
+        </ListBox.ItemTemplate>
+      </ListBox>
+
+      <!-- Input Row -->
+      <Grid Grid.Row="1" ColumnDefinitions="Auto,*" Margin="4">
+        <Button Command="{Binding ToggleFunctionsCommand}" Margin="0,0,6,0">
+          <TextBlock FontFamily="{StaticResource MDI}" Text="{x:Static m:IconFont.Function}" />
+        </Button>
+        <TextBox Grid.Column="1" Text="{Binding InputText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
+          <InputElement.KeyBindings>
+            <KeyBinding Gesture="Enter" Command="{Binding SubmitCommand}" />
+          </InputElement.KeyBindings>
+        </TextBox>
       </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="False"
-                     IsHitTestVisible="False"
-                     Opacity="0.6"
-                     HorizontalAlignment="Center" VerticalAlignment="Center">
-            <TextBlock.Styles>
-              <Style Selector="TextBlock">
-                <Style.Triggers>
-                  <DataTrigger Binding="{Binding History.Count}" Value="0">
-                    <Setter Property="IsVisible" Value="True" />
-                  </DataTrigger>
-                </Style.Triggers>
-              </Style>
-            </TextBlock.Styles>
-          </TextBlock>
-        </Grid>
-
-        <!-- Input Row -->
-        <Grid Grid.Row="1" ColumnDefinitions="Auto,Auto,*,Auto" Margin="4" ColumnSpacing="6">
-          <!-- 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>
-
-          <!-- 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>
+    </Grid>
+  </Grid>
 </UserControl>