MainWindow.xaml

<Window x:Class="DocScanner.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:DocScanner"
        xmlns:vm="clr-namespace:DocScanner.ViewModels"
        xmlns:controls="clr-namespace:DocScanner.Controls"
        xmlns:models="clr-namespace:DocScanner.Models"
        mc:Ignorable="d"
        Title="DocScanner - Document Scanning &amp; Contrast Enhancement"
        Height="800" Width="1240"
        MinHeight="650" MinWidth="980"
        Background="{StaticResource BrushBgApp}"
        Foreground="{StaticResource BrushTextPrimary}"
        WindowStartupLocation="CenterScreen"
        AllowDrop="True"
        Drop="Window_Drop"
        KeyDown="Window_KeyDown">

    <Window.DataContext>
        <vm:MainViewModel x:Name="ViewModel" />
    </Window.DataContext>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" /> <!-- Top Toolbar -->
            <RowDefinition Height="*" />    <!-- Main Workspace -->
            <RowDefinition Height="Auto" /> <!-- Bottom Status Bar -->
        </Grid.RowDefinitions>

        <!-- TOP TOOLBAR -->
        <Border Grid.Row="0"
                Background="{StaticResource BrushBgHeader}"
                BorderBrush="{StaticResource BrushBorder}"
                BorderThickness="0,0,0,1"
                Padding="10,8">
            <DockPanel LastChildFill="False">
                <!-- Left: File Operations -->
                <StackPanel Orientation="Horizontal" DockPanel.Dock="Left">
                    <Button Style="{StaticResource ModernButton}"
                            Command="{Binding AddImagesCommand}"
                            ToolTip="Open document photos or scans from disk"
                            Margin="0,0,6,0">
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="📁 Import Images" FontWeight="Medium" />
                        </StackPanel>
                    </Button>

                    <Button Style="{StaticResource ModernButton}"
                            Command="{Binding AddFromClipboardCommand}"
                            ToolTip="Paste image from clipboard (Ctrl+V)"
                            Margin="0,0,6,0">
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="📋 Paste Clipboard" />
                        </StackPanel>
                    </Button>

                    <Separator Style="{x:Null}" Width="1" Background="{StaticResource BrushBorder}" Margin="6,2,12,2" />

                    <!-- Middle: Geometric / Crop Tools -->
                    <ToggleButton Style="{x:Null}"
                                  IsChecked="{Binding IsCropMode}"
                                  IsEnabled="{Binding HasPages}"
                                  Cursor="Hand"
                                  Padding="10,6"
                                  Margin="0,0,6,0">
                        <ToggleButton.Template>
                            <ControlTemplate TargetType="ToggleButton">
                                <Border x:Name="bgBorder"
                                        Background="{StaticResource BrushBgCard}"
                                        BorderBrush="{StaticResource BrushBorder}"
                                        BorderThickness="1"
                                        CornerRadius="3"
                                        Padding="{TemplateBinding Padding}">
                                    <TextBlock x:Name="txt" Text="📐 Crop / Perspective" Foreground="{StaticResource BrushTextPrimary}" />
                                </Border>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsChecked" Value="True">
                                        <Setter TargetName="bgBorder" Property="Background" Value="{StaticResource BrushBgCardSelected}" />
                                        <Setter TargetName="bgBorder" Property="BorderBrush" Value="{StaticResource BrushAccent}" />
                                        <Setter TargetName="txt" Property="FontWeight" Value="SemiBold" />
                                        <Setter TargetName="txt" Property="Foreground" Value="White" />
                                    </Trigger>
                                    <Trigger Property="IsMouseOver" Value="True">
                                        <Setter TargetName="bgBorder" Property="BorderBrush" Value="{StaticResource BrushBorderLight}" />
                                    </Trigger>
                                    <Trigger Property="IsEnabled" Value="False">
                                        <Setter TargetName="bgBorder" Property="Opacity" Value="0.4" />
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </ToggleButton.Template>
                    </ToggleButton>

                    <Button Style="{StaticResource ModernButton}"
                            Command="{Binding AutoDetectCornersCommand}"
                            IsEnabled="{Binding HasPages}"
                            ToolTip="Automatically detect 4 document corners"
                            Margin="0,0,6,0">
                        <TextBlock Text="✨ Auto-Detect" />
                    </Button>

                    <Button Style="{StaticResource ModernButton}"
                            Command="{Binding ResetCropCommand}"
                            IsEnabled="{Binding HasPages}"
                            ToolTip="Reset crop to full image bounds"
                            Margin="0,0,6,0">
                        <TextBlock Text="🔄 Reset Crop" />
                    </Button>

                    <Button Style="{StaticResource ModernButton}"
                            Command="{Binding RotateLeftCommand}"
                            IsEnabled="{Binding HasPages}"
                            ToolTip="Rotate 90° counter-clockwise"
                            Margin="0,0,4,0">
                        <TextBlock Text="⤹ Rotate L" />
                    </Button>

                    <Button Style="{StaticResource ModernButton}"
                            Command="{Binding RotateRightCommand}"
                            IsEnabled="{Binding HasPages}"
                            ToolTip="Rotate 90° clockwise"
                            Margin="0,0,6,0">
                        <TextBlock Text="⤸ Rotate R" />
                    </Button>

                    <ToggleButton Style="{x:Null}"
                                  IsChecked="{Binding IsSplitView}"
                                  IsEnabled="{Binding HasPages}"
                                  Cursor="Hand"
                                  Padding="10,6"
                                  Margin="0,0,6,0"
                                  ToolTip="Toggle side-by-side comparison with original warped document">
                        <ToggleButton.Template>
                            <ControlTemplate TargetType="ToggleButton">
                                <Border x:Name="bgBorder"
                                        Background="{StaticResource BrushBgCard}"
                                        BorderBrush="{StaticResource BrushBorder}"
                                        BorderThickness="1"
                                        CornerRadius="3"
                                        Padding="{TemplateBinding Padding}">
                                    <TextBlock x:Name="txt" Text="◫ Split View" Foreground="{StaticResource BrushTextSecondary}" />
                                </Border>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsChecked" Value="True">
                                        <Setter TargetName="bgBorder" Property="Background" Value="{StaticResource BrushBgCardSelected}" />
                                        <Setter TargetName="bgBorder" Property="BorderBrush" Value="{StaticResource BrushAccent}" />
                                        <Setter TargetName="txt" Property="Foreground" Value="White" />
                                        <Setter TargetName="txt" Property="FontWeight" Value="SemiBold" />
                                    </Trigger>
                                    <Trigger Property="IsMouseOver" Value="True">
                                        <Setter TargetName="bgBorder" Property="BorderBrush" Value="{StaticResource BrushBorderLight}" />
                                    </Trigger>
                                    <Trigger Property="IsEnabled" Value="False">
                                        <Setter TargetName="bgBorder" Property="Opacity" Value="0.4" />
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </ToggleButton.Template>
                    </ToggleButton>
                </StackPanel>

                <!-- Right: Export Operations -->
                <StackPanel Orientation="Horizontal" DockPanel.Dock="Right">
                    <Button Style="{StaticResource ModernButton}"
                            Command="{Binding ExportCurrentPageImageCommand}"
                            IsEnabled="{Binding HasPages}"
                            ToolTip="Save current enhanced page as PNG/JPEG image"
                            Margin="0,0,8,0">
                        <TextBlock Text="💾 Save Image..." />
                    </Button>

                    <Button Style="{StaticResource AccentButton}"
                            Command="{Binding ExportPdfCommand}"
                            IsEnabled="{Binding HasPages}"
                            ToolTip="Compile all pages into a multi-page PDF document"
                            Padding="14,6">
                        <TextBlock Text="📄 Export PDF" />
                    </Button>
                </StackPanel>
            </DockPanel>
        </Border>

        <!-- MAIN WORKSPACE -->
        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="220" MinWidth="160" MaxWidth="350" /> <!-- Left Thumbnail Sidebar -->
                <ColumnDefinition Width="*" />                                    <!-- Center Canvas -->
                <ColumnDefinition Width="290" MinWidth="240" MaxWidth="400" /> <!-- Right Filter Panel -->
            </Grid.ColumnDefinitions>

            <!-- 1. LEFT SIDEBAR: PAGES LIST -->
            <Border Grid.Column="0"
                    Background="{StaticResource BrushBgSidebar}"
                    BorderBrush="{StaticResource BrushBorder}"
                    BorderThickness="0,0,1,0">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="*" />
                        <RowDefinition Height="Auto" />
                    </Grid.RowDefinitions>

                    <!-- Sidebar Header -->
                    <Border Grid.Row="0"
                            Background="{StaticResource BrushBgHeader}"
                            BorderBrush="{StaticResource BrushBorder}"
                            BorderThickness="0,0,0,1"
                            Padding="12,8">
                        <DockPanel>
                            <TextBlock Text="PAGES"
                                       FontWeight="SemiBold"
                                       FontSize="11"
                                       Foreground="{StaticResource BrushTextMuted}"
                                       VerticalAlignment="Center" />
                            <TextBlock Text="{Binding Pages.Count, StringFormat='({0})'}"
                                       FontSize="11"
                                       Foreground="{StaticResource BrushAccent}"
                                       Margin="6,0,0,0"
                                       VerticalAlignment="Center" />
                        </DockPanel>
                    </Border>

                    <!-- Thumbnails ListBox -->
                    <ListBox Grid.Row="1"
                             Background="Transparent"
                             BorderThickness="0"
                             ItemsSource="{Binding Pages}"
                             SelectedItem="{Binding SelectedPage}"
                             ScrollViewer.HorizontalScrollBarVisibility="Disabled"
                             ScrollViewer.VerticalScrollBarVisibility="Auto"
                             Padding="8">
                        <ListBox.ItemContainerStyle>
                            <Style TargetType="ListBoxItem">
                                <Setter Property="Background" Value="Transparent" />
                                <Setter Property="Padding" Value="4" />
                                <Setter Property="Margin" Value="0,0,0,8" />
                                <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate TargetType="ListBoxItem">
                                            <Border x:Name="itemBorder"
                                                    Background="{StaticResource BrushBgCard}"
                                                    BorderBrush="{StaticResource BrushBorder}"
                                                    BorderThickness="1"
                                                    CornerRadius="4"
                                                    Padding="6">
                                                <ContentPresenter />
                                            </Border>
                                            <ControlTemplate.Triggers>
                                                <Trigger Property="IsMouseOver" Value="True">
                                                    <Setter TargetName="itemBorder" Property="Background" Value="{StaticResource BrushBgCardHover}" />
                                                    <Setter TargetName="itemBorder" Property="BorderBrush" Value="{StaticResource BrushBorderLight}" />
                                                </Trigger>
                                                <Trigger Property="IsSelected" Value="True">
                                                    <Setter TargetName="itemBorder" Property="Background" Value="{StaticResource BrushBgCardSelected}" />
                                                    <Setter TargetName="itemBorder" Property="BorderBrush" Value="{StaticResource BrushAccent}" />
                                                </Trigger>
                                            </ControlTemplate.Triggers>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </ListBox.ItemContainerStyle>
                        <ListBox.ItemTemplate>
                            <DataTemplate DataType="{x:Type models:ScannedPage}">
                                <StackPanel>
                                    <Border Background="#111111"
                                            CornerRadius="2"
                                            Height="140"
                                            HorizontalAlignment="Center">
                                        <Image Source="{Binding ThumbnailBitmap}"
                                               Stretch="Uniform"
                                               RenderOptions.BitmapScalingMode="HighQuality" />
                                    </Border>
                                    <DockPanel Margin="0,6,0,0">
                                        <TextBlock Text="{Binding PageNumber, StringFormat='Page {0}'}"
                                                   FontWeight="SemiBold"
                                                   FontSize="12"
                                                   Foreground="{StaticResource BrushTextPrimary}" />
                                        <TextBlock Text="{Binding FilterType}"
                                                   FontSize="10"
                                                   Foreground="{StaticResource BrushTextMuted}"
                                                   HorizontalAlignment="Right"
                                                   VerticalAlignment="Center" />
                                    </DockPanel>
                                </StackPanel>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>

                    <!-- Sidebar Bottom Toolbar -->
                    <Border Grid.Row="2"
                            Background="{StaticResource BrushBgHeader}"
                            BorderBrush="{StaticResource BrushBorder}"
                            BorderThickness="0,1,0,0"
                            Padding="8">
                        <UniformGrid Columns="3">
                            <Button Style="{StaticResource ModernButton}"
                                    Command="{Binding MovePageUpCommand}"
                                    IsEnabled="{Binding HasSelectedPage}"
                                    ToolTip="Move page up"
                                    Margin="0,0,4,0">
                                <TextBlock Text="▲ Up" FontSize="11" />
                            </Button>
                            <Button Style="{StaticResource ModernButton}"
                                    Command="{Binding MovePageDownCommand}"
                                    IsEnabled="{Binding HasSelectedPage}"
                                    ToolTip="Move page down"
                                    Margin="2,0,2,0">
                                <TextBlock Text="▼ Down" FontSize="11" />
                            </Button>
                            <Button Style="{StaticResource ModernButton}"
                                    Command="{Binding DeletePageCommand}"
                                    IsEnabled="{Binding HasSelectedPage}"
                                    ToolTip="Delete selected page"
                                    Margin="4,0,0,0">
                                <TextBlock Text="✕ Del" FontSize="11" Foreground="#ff6b6b" />
                            </Button>
                        </UniformGrid>
                    </Border>
                </Grid>
            </Border>

            <!-- 2. CENTER CANVAS WORKSPACE -->
            <Grid Grid.Column="1" Background="{StaticResource BrushBgApp}">
                <!-- Empty State Placeholder -->
                <Border Visibility="{Binding HasPages, Converter={StaticResource InverseBoolToVisConverter}}"
                        HorizontalAlignment="Center"
                        VerticalAlignment="Center"
                        Padding="30">
                    <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
                        <TextBlock Text="📄"
                                   FontSize="54"
                                   HorizontalAlignment="Center"
                                   Opacity="0.4"
                                   Margin="0,0,0,16" />
                        <TextBlock Text="No Document Loaded"
                                   FontSize="18"
                                   FontWeight="SemiBold"
                                   Foreground="{StaticResource BrushTextPrimary}"
                                   HorizontalAlignment="Center"
                                   Margin="0,0,0,8" />
                        <TextBlock Text="Drag and drop document photos here, or click Import Images"
                                   FontSize="13"
                                   Foreground="{StaticResource BrushTextMuted}"
                                   HorizontalAlignment="Center"
                                   Margin="0,0,0,20" />
                        <Button Style="{StaticResource AccentButton}"
                                Command="{Binding AddImagesCommand}"
                                HorizontalAlignment="Center"
                                Padding="16,8">
                            <TextBlock Text="Select Document Photos" />
                        </Button>
                    </StackPanel>
                </Border>

                <!-- Active Page View -->
                <Grid Visibility="{Binding HasPages, Converter={StaticResource BoolToVisConverter}}">
                    <!-- A. CROP / PERSPECTIVE MODE -->
                    <Grid Visibility="{Binding IsCropMode, Converter={StaticResource BoolToVisConverter}}">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>

                        <!-- Instruction Ribbon -->
                        <Border Grid.Row="0"
                                Background="#103b59"
                                BorderBrush="{StaticResource BrushAccent}"
                                BorderThickness="0,0,0,1"
                                Padding="12,6">
                            <DockPanel>
                                <TextBlock Text="📐 Interactive Perspective Crop: Drag the 4 corner handles to tightly frame your document."
                                           Foreground="White"
                                           FontSize="12"
                                           VerticalAlignment="Center" />
                                <Button Style="{StaticResource ModernButton}"
                                        Command="{Binding ToggleCropModeCommand}"
                                        HorizontalAlignment="Right"
                                        Padding="10,3">
                                    <TextBlock Text="Done (Apply Crop)" FontWeight="SemiBold" />
                                </Button>
                            </DockPanel>
                        </Border>

                        <controls:InteractiveCropCanvas x:Name="CropCanvas"
                                                       Grid.Row="1"
                                                       Margin="16"
                                                       SourceImage="{Binding SelectedPage.SourceBitmap}"
                                                       Corners="{Binding SelectedPage.Corners, Mode=TwoWay}"
                                                       ImagePixelWidth="{Binding SelectedPage.ImageWidth, FallbackValue=100}"
                                                       ImagePixelHeight="{Binding SelectedPage.ImageHeight, FallbackValue=100}"
                                                       CornersManipulated="CropCanvas_CornersManipulated" />
                    </Grid>

                    <!-- B. ENHANCED PREVIEW MODE -->
                    <Grid Visibility="{Binding IsCropMode, Converter={StaticResource InverseBoolToVisConverter}}">
                        <!-- Single View -->
                        <Grid Visibility="{Binding IsSplitView, Converter={StaticResource InverseBoolToVisConverter}}"
                              Margin="16">
                            <Border Background="#111111"
                                    BorderBrush="{StaticResource BrushBorder}"
                                    BorderThickness="1"
                                    CornerRadius="4">
                                <Image Source="{Binding SelectedPage.ProcessedBitmap}"
                                       Stretch="Uniform"
                                       RenderOptions.BitmapScalingMode="HighQuality" />
                            </Border>
                        </Grid>

                        <!-- Split / Side-by-Side View -->
                        <Grid Visibility="{Binding IsSplitView, Converter={StaticResource BoolToVisConverter}}"
                              Margin="16">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*" />
                                <ColumnDefinition Width="8" />
                                <ColumnDefinition Width="*" />
                            </Grid.ColumnDefinitions>

                            <!-- Left: Original Source -->
                            <Border Grid.Column="0"
                                    Background="#111111"
                                    BorderBrush="{StaticResource BrushBorder}"
                                    BorderThickness="1"
                                    CornerRadius="4">
                                <Grid>
                                    <Image Source="{Binding SelectedPage.SourceBitmap}"
                                           Stretch="Uniform"
                                           RenderOptions.BitmapScalingMode="HighQuality" />
                                    <Border Background="#cc000000"
                                            HorizontalAlignment="Left"
                                            VerticalAlignment="Top"
                                            CornerRadius="0,0,4,0"
                                            Padding="8,4">
                                        <TextBlock Text="Original Photo" FontSize="11" Foreground="{StaticResource BrushTextSecondary}" />
                                    </Border>
                                </Grid>
                            </Border>

                            <GridSplitter Grid.Column="1"
                                          Width="4"
                                          HorizontalAlignment="Center"
                                          Background="{StaticResource BrushBorder}" />

                            <!-- Right: Enhanced Output -->
                            <Border Grid.Column="2"
                                    Background="#111111"
                                    BorderBrush="{StaticResource BrushBorder}"
                                    BorderThickness="1"
                                    CornerRadius="4">
                                <Grid>
                                    <Image Source="{Binding SelectedPage.ProcessedBitmap}"
                                           Stretch="Uniform"
                                           RenderOptions.BitmapScalingMode="HighQuality" />
                                    <Border Background="#cc000000"
                                            HorizontalAlignment="Left"
                                            VerticalAlignment="Top"
                                            CornerRadius="0,0,4,0"
                                            Padding="8,4">
                                        <TextBlock Text="{Binding SelectedPage.FilterType, StringFormat='Enhanced ({0})'}"
                                                   FontSize="11"
                                                   Foreground="{StaticResource BrushAccent}"
                                                   FontWeight="SemiBold" />
                                    </Border>
                                </Grid>
                            </Border>
                        </Grid>
                    </Grid>
                </Grid>

                <!-- Loading Progress Overlay -->
                <Border Background="#99000000"
                        Visibility="{Binding IsBusy, Converter={StaticResource BoolToVisConverter}}"
                        HorizontalAlignment="Stretch"
                        VerticalAlignment="Stretch">
                    <Border Background="{StaticResource BrushBgCard}"
                            BorderBrush="{StaticResource BrushAccent}"
                            BorderThickness="1"
                            CornerRadius="6"
                            Padding="24,16"
                            HorizontalAlignment="Center"
                            VerticalAlignment="Center">
                        <StackPanel HorizontalAlignment="Center">
                            <ProgressBar IsIndeterminate="True"
                                         Height="4"
                                         Width="180"
                                         Foreground="{StaticResource BrushAccent}"
                                         Margin="0,0,0,12" />
                            <TextBlock Text="{Binding StatusText}"
                                       Foreground="{StaticResource BrushTextPrimary}"
                                       FontSize="12"
                                       HorizontalAlignment="Center" />
                        </StackPanel>
                    </Border>
                </Border>
            </Grid>

            <!-- 3. RIGHT CONTROL & FILTER PANEL -->
            <Border Grid.Column="2"
                    Background="{StaticResource BrushBgSidebar}"
                    BorderBrush="{StaticResource BrushBorder}"
                    BorderThickness="1,0,0,0"
                    IsEnabled="{Binding HasPages}">
                <ScrollViewer VerticalScrollBarVisibility="Auto"
                              HorizontalScrollBarVisibility="Disabled"
                              Padding="14">
                    <StackPanel>
                        <!-- Section: Presets -->
                        <TextBlock Text="DOCUMENT PRESETS"
                                   FontWeight="SemiBold"
                                   FontSize="11"
                                   Foreground="{StaticResource BrushTextMuted}"
                                   Margin="0,0,0,10" />

                        <RadioButton Style="{StaticResource PresetRadioButton}"
                                     GroupName="FilterPreset"
                                     IsChecked="{Binding ActiveFilterType, Converter={StaticResource EnumToBoolConverter}, ConverterParameter=EnhancedColor}"
                                     Command="{Binding SetFilterCommand}"
                                     CommandParameter="EnhancedColor">
                            <StackPanel>
                                <TextBlock Text="Enhanced Color" FontWeight="SemiBold" Foreground="{StaticResource BrushTextPrimary}" />
                                <TextBlock Text="Illumination normalization: Shadow removal + crisp text + vivid color"
                                           FontSize="10"
                                           Foreground="{StaticResource BrushTextMuted}"
                                           TextWrapping="Wrap" />
                            </StackPanel>
                        </RadioButton>

                        <RadioButton Style="{StaticResource PresetRadioButton}"
                                     GroupName="FilterPreset"
                                     IsChecked="{Binding ActiveFilterType, Converter={StaticResource EnumToBoolConverter}, ConverterParameter=BlackAndWhite}"
                                     Command="{Binding SetFilterCommand}"
                                     CommandParameter="BlackAndWhite">
                            <StackPanel>
                                <TextBlock Text="B&amp;W Clean Document" FontWeight="SemiBold" Foreground="{StaticResource BrushTextPrimary}" />
                                <TextBlock Text="Pure white paper (#FFFFFF) &amp; deep black text binarization"
                                           FontSize="10"
                                           Foreground="{StaticResource BrushTextMuted}"
                                           TextWrapping="Wrap" />
                            </StackPanel>
                        </RadioButton>

                        <RadioButton Style="{StaticResource PresetRadioButton}"
                                     GroupName="FilterPreset"
                                     IsChecked="{Binding ActiveFilterType, Converter={StaticResource EnumToBoolConverter}, ConverterParameter=GrayscaleHighContrast}"
                                     Command="{Binding SetFilterCommand}"
                                     CommandParameter="GrayscaleHighContrast">
                            <StackPanel>
                                <TextBlock Text="Grayscale High-Contrast" FontWeight="SemiBold" Foreground="{StaticResource BrushTextPrimary}" />
                                <TextBlock Text="Adaptive histogram equalization for monochrome scans"
                                           FontSize="10"
                                           Foreground="{StaticResource BrushTextMuted}"
                                           TextWrapping="Wrap" />
                            </StackPanel>
                        </RadioButton>

                        <RadioButton Style="{StaticResource PresetRadioButton}"
                                     GroupName="FilterPreset"
                                     IsChecked="{Binding ActiveFilterType, Converter={StaticResource EnumToBoolConverter}, ConverterParameter=SharpenOnly}"
                                     Command="{Binding SetFilterCommand}"
                                     CommandParameter="SharpenOnly">
                            <StackPanel>
                                <TextBlock Text="Detail Sharpening" FontWeight="SemiBold" Foreground="{StaticResource BrushTextPrimary}" />
                                <TextBlock Text="High-pass text stroke edge enhancement"
                                           FontSize="10"
                                           Foreground="{StaticResource BrushTextMuted}"
                                           TextWrapping="Wrap" />
                            </StackPanel>
                        </RadioButton>

                        <RadioButton Style="{StaticResource PresetRadioButton}"
                                     GroupName="FilterPreset"
                                     IsChecked="{Binding ActiveFilterType, Converter={StaticResource EnumToBoolConverter}, ConverterParameter=Original}"
                                     Command="{Binding SetFilterCommand}"
                                     CommandParameter="Original">
                            <StackPanel>
                                <TextBlock Text="Original (Unenhanced)" FontWeight="SemiBold" Foreground="{StaticResource BrushTextPrimary}" />
                                <TextBlock Text="Raw perspective-warped document image"
                                           FontSize="10"
                                           Foreground="{StaticResource BrushTextMuted}"
                                           TextWrapping="Wrap" />
                            </StackPanel>
                        </RadioButton>

                        <Separator Style="{x:Null}" Height="1" Background="{StaticResource BrushBorder}" Margin="0,12,0,14" />

                        <!-- Section: Fine-Tuning Sliders -->
                        <DockPanel Margin="0,0,0,10">
                            <TextBlock Text="FINE-TUNING ADJUSTMENTS"
                                       FontWeight="SemiBold"
                                       FontSize="11"
                                       Foreground="{StaticResource BrushTextMuted}"
                                       VerticalAlignment="Center" />
                            
                            <Button Style="{StaticResource ModernButton}"
                                    Command="{Binding ResetActivePresetCommand}"
                                    ToolTip="Reset current preset settings to default"
                                    HorizontalAlignment="Right"
                                    Padding="6,2"
                                    FontSize="10">
                                <TextBlock Text="↺ Reset" />
                            </Button>
                        </DockPanel>

                        <!-- Shadow Suppression Slider -->
                        <StackPanel Visibility="{Binding ShowShadowSlider, Converter={StaticResource BoolToVisConverter}}">
                            <DockPanel Margin="0,0,0,2">
                                <TextBlock Text="Shadow Removal" FontSize="11" Foreground="{StaticResource BrushTextSecondary}" />
                                <TextBlock Text="{Binding ShadowSuppression, StringFormat='{}{0:P0}'}"
                                           FontSize="11"
                                           Foreground="{StaticResource BrushAccent}"
                                           HorizontalAlignment="Right" />
                            </DockPanel>
                            <Slider Style="{StaticResource ModernSlider}"
                                    Minimum="0.0" Maximum="1.5"
                                    Value="{Binding ShadowSuppression, Mode=TwoWay}"
                                    ValueChanged="Slider_ValueChanged" />
                        </StackPanel>

                        <!-- Sharpening Slider -->
                        <StackPanel Visibility="{Binding ShowSharpeningSlider, Converter={StaticResource BoolToVisConverter}}">
                            <DockPanel Margin="0,0,0,2">
                                <TextBlock Text="Text Sharpening" FontSize="11" Foreground="{StaticResource BrushTextSecondary}" />
                                <TextBlock Text="{Binding Sharpening, StringFormat='{}{0:F1}'}"
                                           FontSize="11"
                                           Foreground="{StaticResource BrushAccent}"
                                           HorizontalAlignment="Right" />
                            </DockPanel>
                            <Slider Style="{StaticResource ModernSlider}"
                                    Minimum="0.0" Maximum="4.0"
                                    Value="{Binding Sharpening, Mode=TwoWay}"
                                    ValueChanged="Slider_ValueChanged" />
                        </StackPanel>

                        <!-- Contrast Slider -->
                        <StackPanel Visibility="{Binding ShowContrastSlider, Converter={StaticResource BoolToVisConverter}}">
                            <DockPanel Margin="0,0,0,2">
                                <TextBlock Text="Contrast" FontSize="11" Foreground="{StaticResource BrushTextSecondary}" />
                                <TextBlock Text="{Binding Contrast, StringFormat='{}{0:F2}x'}"
                                           FontSize="11"
                                           Foreground="{StaticResource BrushAccent}"
                                           HorizontalAlignment="Right" />
                            </DockPanel>
                            <Slider Style="{StaticResource ModernSlider}"
                                    Minimum="0.5" Maximum="3.5"
                                    Value="{Binding Contrast, Mode=TwoWay}"
                                    ValueChanged="Slider_ValueChanged" />
                        </StackPanel>

                        <!-- Brightness Slider -->
                        <StackPanel Visibility="{Binding ShowBrightnessSlider, Converter={StaticResource BoolToVisConverter}}">
                            <DockPanel Margin="0,0,0,2">
                                <TextBlock Text="Brightness" FontSize="11" Foreground="{StaticResource BrushTextSecondary}" />
                                <TextBlock Text="{Binding Brightness, StringFormat='{}{0:+0;-0;0}'}"
                                           FontSize="11"
                                           Foreground="{StaticResource BrushAccent}"
                                           HorizontalAlignment="Right" />
                            </DockPanel>
                            <Slider Style="{StaticResource ModernSlider}"
                                    Minimum="-80" Maximum="80"
                                    Value="{Binding Brightness, Mode=TwoWay}"
                                    ValueChanged="Slider_ValueChanged" />
                        </StackPanel>

                        <!-- B&W Threshold Offset Slider -->
                        <StackPanel Visibility="{Binding ShowThresholdSlider, Converter={StaticResource BoolToVisConverter}}">
                            <DockPanel Margin="0,0,0,2">
                                <TextBlock Text="B&amp;W Threshold Tuning" FontSize="11" Foreground="{StaticResource BrushTextSecondary}" />
                                <TextBlock Text="{Binding ThresholdOffset, StringFormat='{}{0:+0;-0;0}'}"
                                           FontSize="11"
                                           Foreground="{StaticResource BrushAccent}"
                                           HorizontalAlignment="Right" />
                            </DockPanel>
                            <Slider Style="{StaticResource ModernSlider}"
                                    Minimum="-30" Maximum="30"
                                    Value="{Binding ThresholdOffset, Mode=TwoWay}"
                                    ValueChanged="Slider_ValueChanged" />
                        </StackPanel>

                        <!-- Denoise Cleanup Slider -->
                        <StackPanel Visibility="{Binding ShowDenoiseSlider, Converter={StaticResource BoolToVisConverter}}">
                            <DockPanel Margin="0,0,0,2">
                                <TextBlock Text="Noise Reduction" FontSize="11" Foreground="{StaticResource BrushTextSecondary}" />
                                <TextBlock Text="{Binding DenoiseStrength}"
                                           FontSize="11"
                                           Foreground="{StaticResource BrushAccent}"
                                           HorizontalAlignment="Right" />
                            </DockPanel>
                            <Slider Style="{StaticResource ModernSlider}"
                                    Minimum="0" Maximum="4"
                                    IsSnapToTickEnabled="True"
                                    TickFrequency="1"
                                    Value="{Binding DenoiseStrength, Mode=TwoWay}"
                                    ValueChanged="Slider_ValueChanged" />
                        </StackPanel>

                        <Separator Style="{x:Null}" Height="1" Background="{StaticResource BrushBorder}" Margin="0,14,0,14" />

                        <!-- Batch Actions -->
                        <TextBlock Text="BATCH OPERATIONS"
                                   FontWeight="SemiBold"
                                   FontSize="11"
                                   Foreground="{StaticResource BrushTextMuted}"
                                   Margin="0,0,0,10" />

                        <Button Style="{StaticResource ModernButton}"
                                Command="{Binding BatchExportAllImagesCommand}"
                                Margin="0,0,0,8">
                            <TextBlock Text="📁 Export All Pages to Folder..." />
                        </Button>
                    </StackPanel>
                </ScrollViewer>
            </Border>
        </Grid>

        <!-- BOTTOM STATUS BAR -->
        <Border Grid.Row="2"
                Background="{StaticResource BrushBgHeader}"
                BorderBrush="{StaticResource BrushBorder}"
                BorderThickness="0,1,0,0"
                Padding="12,4">
            <DockPanel>
                <TextBlock Text="{Binding StatusText}"
                           FontSize="11"
                           Foreground="{StaticResource BrushTextSecondary}"
                           VerticalAlignment="Center" />

                <TextBlock Text="{Binding DetailsText}"
                           FontSize="11"
                           Foreground="{StaticResource BrushTextMuted}"
                           HorizontalAlignment="Right"
                           VerticalAlignment="Center" />
            </DockPanel>
        </Border>

        <!-- GLOBAL IN-APP SUCCESS MODAL DIALOG (STAYS OPEN UNTIL DISMISSED BY USER) -->
        <Border Grid.Row="0" Grid.RowSpan="3"
                Background="#b3000000"
                Visibility="{Binding IsSuccessDialogOpen, Converter={StaticResource BoolToVisConverter}}"
                HorizontalAlignment="Stretch"
                VerticalAlignment="Stretch"
                Panel.ZIndex="1000">
            <Border Background="{StaticResource BrushBgSidebar}"
                    BorderBrush="{StaticResource BrushAccent}"
                    BorderThickness="1"
                    CornerRadius="6"
                    Padding="24"
                    MaxWidth="520"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center">
                <StackPanel>
                    <DockPanel Margin="0,0,0,12">
                        <TextBlock Text="{Binding SuccessDialogTitle}"
                                   FontWeight="Bold"
                                   FontSize="15"
                                   Foreground="{StaticResource BrushTextPrimary}"
                                   VerticalAlignment="Center" />
                    </DockPanel>

                    <TextBlock Text="{Binding SuccessDialogMessage}"
                               Foreground="{StaticResource BrushTextSecondary}"
                               FontSize="12"
                               TextWrapping="Wrap"
                               Margin="0,0,0,24" />

                    <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
                        <Button Style="{StaticResource ModernButton}"
                                Command="{Binding OpenExportedFolderCommand}"
                                Margin="0,0,8,0"
                                Padding="12,6">
                            <TextBlock Text="📁 Open Folder" />
                        </Button>
                        <Button Style="{StaticResource AccentButton}"
                                Command="{Binding OpenExportedFileCommand}"
                                Margin="0,0,8,0"
                                Padding="12,6">
                            <TextBlock Text="📄 Open File" />
                        </Button>
                        <Button Style="{StaticResource ModernButton}"
                                Command="{Binding CloseSuccessDialogCommand}"
                                Padding="16,6">
                            <TextBlock Text="OK" />
                        </Button>
                    </StackPanel>
                </StackPanel>
            </Border>
        </Border>
    </Grid>
</Window>