MainWindow.xaml

<Window x:Class="KillerShell.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:KillerShell"
        xmlns:models="clr-namespace:KillerShell.Models"
        xmlns:shell="clr-namespace:System.Windows.Shell;assembly=PresentationFramework"
        Title="KillerShell"
        Icon="Resources/ksh-icon.ico"
        Height="710" Width="1140" MinHeight="500" MinWidth="600"
        WindowStyle="None"
        AllowDrop="True" DragOver="Window_DragOver" Drop="Window_Drop"
        Background="{DynamicResource BackgroundBrush}"
        TextOptions.TextFormattingMode="Display"
        TextOptions.TextRenderingMode="ClearType"
        UseLayoutRounding="True"
        SnapsToDevicePixels="True"
        WindowStartupLocation="CenterScreen"
        PreviewKeyDown="Window_PreviewKeyDown"
        PreviewKeyUp="Window_PreviewKeyUp">

    <shell:WindowChrome.WindowChrome>
        <shell:WindowChrome CaptionHeight="36" ResizeBorderThickness="8" CornerRadius="0"
                            GlassFrameThickness="0" UseAeroCaptionButtons="False"/>
    </shell:WindowChrome.WindowChrome>

    <Grid x:Name="RootGrid" Opacity="0">
        <Grid.RowDefinitions>
            <RowDefinition Height="36"/>   <!-- 0: title bar -->
            <RowDefinition Height="*"/>    <!-- 1: main content -->
            <RowDefinition Height="24"/>   <!-- 2: footer -->
        </Grid.RowDefinitions>

        <!-- ══════════ ROW 0 - TITLE BAR ══════════ -->
        <Grid Grid.Row="0" Background="{DynamicResource BackgroundBrush}">
            <Border IsHitTestVisible="False">
                <Border.Background>
                    <ImageBrush x:Name="TitleGrainBrush" TileMode="Tile" ViewportUnits="Absolute" Viewport="0,0,256,256" Stretch="None"/>
                </Border.Background>
                <Border.OpacityMask><SolidColorBrush Color="White" Opacity="{DynamicResource GrainOpacity}"/></Border.OpacityMask>
            </Border>

            <!-- App icon + wordmark, exactly like KillerScan: icon in the corner, then the
                 typewriter wordmark with a blurred dark copy behind the crisp text
                 (faded by IconShadowOpacity; 0 in light mode = no shadow). -->
            <StackPanel Orientation="Horizontal" VerticalAlignment="Center" Margin="14,0">
                <Image x:Name="TitleIcon" Width="27" Height="27" VerticalAlignment="Center" Margin="0,0,7,0"
                       RenderOptions.BitmapScalingMode="HighQuality" IsHitTestVisible="False"/>
                <!-- The wordmark drives the app-wide accessibility size: roll the wheel over it
                     (AppScale.cs). Hit-test-visible in the chrome so the wheel reaches it, which
                     also opts it out of the native caption - so window drag and double-click
                     maximize come back via the LogoBar handlers. Family standard; the website
                     link lives on the About card's wordmark. -->
                <Grid x:Name="LogoBar" VerticalAlignment="Center" shell:WindowChrome.IsHitTestVisibleInChrome="True"
                      Cursor="Hand" ToolTip="{DynamicResource Str_TT_AppSize}" Background="Transparent"
                      MouseWheel="LogoBar_MouseWheel" MouseLeftButtonDown="LogoBar_MouseLeftButtonDown">
                    <!-- Main-titlebar wordmark is 18/23.4 (KillerScan standard); dialogs use 15/19.5. -->
                    <TextBlock FontFamily="{DynamicResource WordmarkFont}" FontSize="18" Margin="1,2,0,0" Opacity="{DynamicResource IconShadowOpacity}">
                        <TextBlock.Effect><BlurEffect Radius="3"/></TextBlock.Effect>
                        <Run Text="Killer" Foreground="#D8000000"/><Run Text="Shell" FontSize="23.4" FontWeight="Bold" Foreground="#D8000000"/>
                    </TextBlock>
                    <TextBlock FontFamily="{DynamicResource WordmarkFont}" FontSize="18">
                        <Run Text="Killer" Foreground="{DynamicResource TextBrush}"/><Run Text="Shell" FontSize="23.4" FontWeight="Bold" Foreground="{DynamicResource PrimaryBrush}"/>
                    </TextBlock>
                </Grid>

                <!-- Elevated only (Elevation.cs). OUTSIDE LogoBar on purpose: the wordmark is
                     the scroll-to-zoom target, and widening its hit area with a caption would
                     mean rolling the wheel next to the logo silently resized the app. -->
                <TextBlock x:Name="ElevatedTag" Visibility="Collapsed" VerticalAlignment="Center"
                           Margin="9,3,0,0" FontFamily="Consolas" FontSize="11.5"
                           Text="{DynamicResource Str_Title_Elevated}"/>
            </StackPanel>

            <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" shell:WindowChrome.IsHitTestVisibleInChrome="True">
                <!-- Language and theme moved to the icon rail (column 0), the way KillerNotes
                     has them. The title bar keeps only the window buttons. -->
                <Button x:Name="MinimizeBtn" Click="MinimizeBtn_Click" Style="{StaticResource ChromeButton}" Content="&#xE921;"/>
                <Button x:Name="MaximizeBtn" Click="MaximizeBtn_Click" Style="{StaticResource ChromeButton}" Content="&#xE922;"/>
                <Button x:Name="CloseBtn"    Click="CloseBtn_Click"    Style="{StaticResource ChromeCloseButton}" Content="&#xE8BB;"/>
            </StackPanel>

            <!-- Theme + accent flyout -->
            <!-- StaysOpen so the flyout doesn't take mouse capture: the results list keeps
                 scrolling under it. Outside clicks close it from code. -->
            <!-- Placement follows the button: it used to hang below a title-bar glyph at the top
                 right, and now opens upward off a rail button pinned to the bottom left, so the
                 flyout grows over the pane instead of off the bottom edge. -->
            <Popup x:Name="ThemePopup" PlacementTarget="{Binding ElementName=ThemeButton}" Placement="Top"
                   StaysOpen="True" AllowsTransparency="True" HorizontalOffset="-6" VerticalOffset="-2">
                <Border Background="{DynamicResource MenuBackgroundBrush}" BorderBrush="{DynamicResource MenuBorderBrush}"
                        BorderThickness="1" CornerRadius="6" Padding="12,10" Margin="14">
                    <Border.Effect><DropShadowEffect Color="Black" BlurRadius="22" ShadowDepth="4" Direction="270" Opacity="0.55"/></Border.Effect>
                    <StackPanel>
                        <TextBlock Text="{DynamicResource Str_Lbl_Theme}" Foreground="{DynamicResource DimTextBrush}" FontFamily="Consolas" FontSize="10" Margin="0,0,0,4"/>
                        <StackPanel x:Name="ThemeSwatches" Orientation="Horizontal">
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Dark"     Background="#3a3a3a" Click="ThemeSwatch_Click" ToolTip="Dark"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Light"    Background="#e8e8e8" Click="ThemeSwatch_Click" ToolTip="Light"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Black"    Background="#000000" Click="ThemeSwatch_Click" ToolTip="Black"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Blood"    Background="#4a1f20" Click="ThemeSwatch_Click" ToolTip="Blood"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Greed"    Background="#0a5234" Click="ThemeSwatch_Click" ToolTip="Greed"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Cyanotic" Background="#0a4a6e" Click="ThemeSwatch_Click" ToolTip="Cyanotic"/>
                        </StackPanel>
                        <TextBlock x:Name="AccentLabel" Text="{DynamicResource Str_Lbl_Accent}" Foreground="{DynamicResource DimTextBrush}" FontFamily="Consolas" FontSize="10" Margin="0,8,0,4"/>
                        <StackPanel x:Name="AccentSwatches" Orientation="Horizontal">
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Red"    Background="#DD504B" Click="AccentSwatch_Click" ToolTip="Red"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Orange" Background="#E8962C" Click="AccentSwatch_Click" ToolTip="Orange"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Green"  Background="#1ea54c" Click="AccentSwatch_Click" ToolTip="Green"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Teal"   Background="#1FB8A8" Click="AccentSwatch_Click" ToolTip="Teal"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Blue"   Background="#50AEE8" Click="AccentSwatch_Click" ToolTip="Blue"/>
                            <Button Style="{StaticResource ThemeSwatch}" Tag="Purple" Background="#B982E3" Click="AccentSwatch_Click" ToolTip="Purple"/>
                        </StackPanel>

                        <!-- Fonts sit behind a row rather than in the flyout itself: a font
                             list is hundreds of entries and belongs in a dialog, while this
                             flyout is swatches you pick at a glance. Room below for more of
                             these as other pickers break out. -->
                        <Border Height="1" Margin="0,12,0,6" Background="{DynamicResource MenuBorderBrush}"/>
                        <Button x:Name="FontsRowBtn" Click="FontsRow_Click"
                                Style="{StaticResource MenuRowButton}">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="&#xE8D2;" FontFamily="Segoe MDL2 Assets" FontSize="12"
                                           Margin="0,0,8,0" VerticalAlignment="Center"/>
                                <TextBlock Text="{DynamicResource Str_Fonts_Row}" FontFamily="Consolas"
                                           FontSize="11.5" VerticalAlignment="Center"/>
                            </StackPanel>
                        </Button>
                        <Button x:Name="AssocRowBtn" Click="AssocRow_Click"
                                Style="{StaticResource MenuRowButton}">
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Text="&#xE71B;" FontFamily="Segoe MDL2 Assets" FontSize="12"
                                           Margin="0,0,8,0" VerticalAlignment="Center"/>
                                <TextBlock Text="{DynamicResource Str_Assoc_Row}" FontFamily="Consolas"
                                           FontSize="11.5" VerticalAlignment="Center"/>
                            </StackPanel>
                        </Button>
                    </StackPanel>
                </Border>
            </Popup>
        </Grid>

        <!-- ══════════ ROW 1 - 2-PANEL GRID ══════════ -->
        <!-- ScaleHost: the app-wide accessibility zoom (AppScale.cs) puts a LayoutTransform
             here, not on the root grid, so the title bar and footer keep a fixed size and the
             wordmark you scroll over never moves. LayoutTransform reflows and re-rasterizes
             text; RenderTransform would bitmap-stretch it. -->
        <Grid x:Name="ScaleHost" Grid.Row="1" Panel.ZIndex="1">
            <Grid.ColumnDefinitions>
                <!-- Folder tree, then the permanent icon rail on the tree's inner lip, then the
                     results, then the search panel out on the right edge. Both side panels
                     collapse to zero width and are driven from the one rail; the rail itself
                     never moves, which is the whole reason it sits between the tree and the
                     content rather than on the window's outer edge. -->
                <ColumnDefinition x:Name="TreeCol" Width="240" MinWidth="0" MaxWidth="420"/>
                <ColumnDefinition x:Name="RailCol" Width="24"/>
                <ColumnDefinition x:Name="TreeGapCol" Width="6"/>
                <ColumnDefinition Width="*" MinWidth="220"/>
                <ColumnDefinition x:Name="SearchGapCol" Width="0"/>
                <ColumnDefinition x:Name="SearchCol" Width="0" MinWidth="0" MaxWidth="380"/>
            </Grid.ColumnDefinitions>

            <!-- Continuous grain behind the whole row: both sidebars, the gaps, and the margins around the results pane -->
            <Border Grid.ColumnSpan="6" IsHitTestVisible="False" Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>

            <!-- COLUMN 0 - FOLDER TREE. Open by default: this is a file manager now, and the
                 tree is how you get around in one. Collapses from the rail. -->
            <Grid Grid.Column="0" x:Name="TreePanel">
                <Grid.RowDefinitions>
                    <RowDefinition Height="*"/>
                    <!-- Auto, so the favorites slide-up's animated Height drives the split and
                         the tree above simply gives up the room (the Killculator arrangement). -->
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>
                <Border Grid.Row="0" Background="Transparent" Padding="4,6,2,6">
                    <TreeView x:Name="FolderTree" Style="{StaticResource FolderTreeView}"
                              TreeViewItem.Expanded="FolderTree_Expanded"
                              TreeViewItem.Collapsed="FolderTree_Collapsed"
                              ContextMenuOpening="FolderTree_ContextMenuOpening"
                              SelectedItemChanged="FolderTree_SelectedItemChanged">
                        <!-- Folder-only menu, so it reuses the results menu's strings where they
                             already say the right thing (FolderTree.cs). On the TreeView itself,
                             not the item template - see the results list for why. -->
                        <TreeView.ContextMenu>
                            <ContextMenu>
                                <MenuItem Header="{DynamicResource Str_Tab_New}" Click="TreeOpenNewTab_Click">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE710;"/></MenuItem.Icon>
                                </MenuItem>
                                <MenuItem Header="{DynamicResource Str_Menu_ShowExplorer}" Click="TreeShowInExplorer_Click">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE838;"/></MenuItem.Icon>
                                </MenuItem>
                                <MenuItem Header="{DynamicResource Str_Menu_SearchHere}" Click="TreeSearchHere_Click">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE721;"/></MenuItem.Icon>
                                </MenuItem>
                                <Separator/>
                                <MenuItem Tag="fav" Header="{DynamicResource Str_Menu_AddFavorite}" Click="TreeFavorite_Click">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE734;"/></MenuItem.Icon>
                                </MenuItem>
                                <MenuItem Header="{DynamicResource Str_Menu_CopyPath}" Click="TreeCopyPath_Click">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE71B;"/></MenuItem.Icon>
                                </MenuItem>
                                <Separator/>
                                <MenuItem Header="{DynamicResource Str_Menu_Properties}" Click="TreeProperties_Click">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE946;"/></MenuItem.Icon>
                                </MenuItem>
                                <MenuItem Header="{DynamicResource Str_Menu_ShellMenu}" Click="TreeShellMenu_Click">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE712;"/></MenuItem.Icon>
                                </MenuItem>
                            </ContextMenu>
                        </TreeView.ContextMenu>
                        <TreeView.ItemContainerStyle>
                            <!-- Inherits the themed template from Controls.xaml and adds the
                                 two-way state bindings, so RevealInTree can drive the tree from
                                 code when navigation came from somewhere else. -->
                            <Style TargetType="TreeViewItem" BasedOn="{StaticResource FolderTreeItem}">
                                <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}"/>
                                <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}"/>
                            </Style>
                        </TreeView.ItemContainerStyle>
                        <TreeView.ItemTemplate>
                            <HierarchicalDataTemplate DataType="{x:Type local:FolderNode}"
                                                      ItemsSource="{Binding Children}">
                                <StackPanel Orientation="Horizontal" Margin="0,1">
                                    <Image Source="{Binding Icon}" Width="16" Height="16"
                                           VerticalAlignment="Center" Margin="0,0,6,0"
                                           RenderOptions.BitmapScalingMode="HighQuality"/>
                                    <TextBlock Text="{Binding Name}" VerticalAlignment="Center"
                                               FontFamily="{DynamicResource MonoFont}" FontSize="11"
                                               Foreground="{DynamicResource TextBrush}"
                                               TextTrimming="CharacterEllipsis"
                                               ToolTip="{Binding Path}"/>
                                </StackPanel>
                            </HierarchicalDataTemplate>
                        </TreeView.ItemTemplate>
                    </TreeView>
                </Border>

                <!-- Edge fades, KillerNotes' NotesFade pattern on both ends: nodes dissolve into
                     the chrome as they scroll off rather than being clipped mid-row. The overlay
                     IS the chrome - BackgroundBrush plus the same grain - under an opacity mask,
                     so it fades to an exact match for the sidebar (never darker, grain intact)
                     instead of a flat black band. Inset 12px on the right to clear the
                     scrollbar, and hit-test-transparent so the tree still takes clicks under it.
                     Each one is only there while there is something PAST it - none at the very
                     top, none at the very bottom, the way the sites do it. A fade over an edge
                     that is already flush just looks like that row has been smudged. Both ramp
                     in over their own height as a row slides under them
                     (TreePanel.SyncTreeEdgeFades), so they arrive exactly as fast as they become
                     true and neither pops. -->
                <Border x:Name="TreeFadeTop" Grid.Row="0" Height="18" Opacity="0"
                        VerticalAlignment="Top" Margin="0,0,12,0" IsHitTestVisible="False">
                    <Border.OpacityMask>
                        <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                            <GradientStop Color="#FF000000" Offset="0"/>
                            <GradientStop Color="#00000000" Offset="1"/>
                        </LinearGradientBrush>
                    </Border.OpacityMask>
                    <Grid>
                        <Border Background="{DynamicResource BackgroundBrush}"/>
                        <Border Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                    </Grid>
                </Border>
                <!-- Bottom margin is driven from code (TreePanel.cs): when the tree grows a
                     horizontal scrollbar the content's bottom edge moves UP by its height, and a
                     fade pinned to the row would sit over the scrollbar instead of over the last
                     row it is meant to be fading out. -->
                <Border x:Name="TreeFadeBottom" Grid.Row="0" Height="22" Opacity="0"
                        VerticalAlignment="Bottom" Margin="0,0,12,0" IsHitTestVisible="False">
                    <Border.OpacityMask>
                        <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                            <GradientStop Color="#00000000" Offset="0"/>
                            <GradientStop Color="#FF000000" Offset="1"/>
                        </LinearGradientBrush>
                    </Border.OpacityMask>
                    <Grid>
                        <Border Background="{DynamicResource BackgroundBrush}"/>
                        <Border Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                    </Grid>
                </Border>

                <!-- FAVORITES SLIDE-UP (Bookmarks.cs). Height animates 0 -> open so it rises
                     out of the sidebar's bottom edge, the way KillerNotes' Killculator does.
                     No header and no close button by design: the rail star is the handle and
                     the rows are the whole content. A hairline on top is the only separator,
                     since a full card would read as a second panel rather than a drawer. -->
                <Border x:Name="BookmarksPanel" Grid.Row="1" Height="0" Visibility="Collapsed"
                        ClipToBounds="True" AllowDrop="True"
                        BorderBrush="{DynamicResource TreeLineBrush}" BorderThickness="0,1,0,0"
                        DragOver="BookmarksPanel_DragOver" Drop="BookmarksPanel_Drop">
                    <Grid>
                        <Border Background="{DynamicResource BackgroundBrush}"/>
                        <Border Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                        <ListBox x:Name="BookmarksList" Background="Transparent" BorderThickness="0"
                                 Padding="4,4,2,4" Focusable="False" FocusVisualStyle="{x:Null}"
                                 ScrollViewer.HorizontalScrollBarVisibility="Disabled">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="0"/>
                                    <Setter Property="Margin" Value="0"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                    <Setter Property="Template">
                                        <Setter.Value><ControlTemplate TargetType="ListBoxItem"><ContentPresenter/></ControlTemplate></Setter.Value>
                                    </Setter>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate DataType="{x:Type local:Bookmark}">
                                    <Border Padding="4,3" CornerRadius="3" Cursor="Hand"
                                            ToolTip="{Binding Path}"
                                            MouseLeftButtonUp="Bookmark_Click">
                                        <Border.Style>
                                            <Style TargetType="Border">
                                                <Setter Property="Background" Value="Transparent"/>
                                                <Style.Triggers>
                                                    <Trigger Property="IsMouseOver" Value="True">
                                                        <Setter Property="Background" Value="{DynamicResource RowHoverBrush}"/>
                                                    </Trigger>
                                                </Style.Triggers>
                                            </Style>
                                        </Border.Style>
                                        <Border.ContextMenu>
                                            <ContextMenu>
                                                <MenuItem Header="{DynamicResource Str_Menu_RemoveFavorite}"
                                                          Click="BookmarkRemove_Click">
                                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE738;"/></MenuItem.Icon>
                                                </MenuItem>
                                            </ContextMenu>
                                        </Border.ContextMenu>
                                        <StackPanel Orientation="Horizontal">
                                            <Image Source="{Binding Icon}" Width="16" Height="16"
                                                   VerticalAlignment="Center" Margin="0,0,6,0"
                                                   RenderOptions.BitmapScalingMode="HighQuality"/>
                                            <TextBlock Text="{Binding Name}" VerticalAlignment="Center"
                                                       FontFamily="{DynamicResource MonoFont}" FontSize="11"
                                                       Foreground="{DynamicResource TextBrush}"
                                                       TextTrimming="CharacterEllipsis"/>
                                        </StackPanel>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>

                        <!-- Divider grip. Same Thumb approach as the tree's width handle, turned
                             through 90 degrees: the drawer's Height is animated by the open and
                             close, so a GridSplitter would be fighting that same property.
                             The Border's own 1px top edge is the visible divider; this is the
                             5px band you can actually grab. -->
                        <Thumb x:Name="BookmarksGrip" Height="5" VerticalAlignment="Top"
                               Panel.ZIndex="60" Cursor="SizeNS"
                               DragDelta="BookmarksGrip_DragDelta"
                               DragCompleted="BookmarksGrip_DragCompleted">
                            <Thumb.Template>
                                <ControlTemplate TargetType="Thumb">
                                    <!-- Transparent, not empty: a Border with no Background is
                                         not hit-testable and the grip would be unusable. -->
                                    <Border Background="Transparent">
                                        <Rectangle x:Name="hint" Height="1" VerticalAlignment="Top"
                                                   Fill="{DynamicResource TreeLineBrush}" Opacity="0"/>
                                    </Border>
                                    <ControlTemplate.Triggers>
                                        <Trigger Property="IsMouseOver" Value="True">
                                            <Setter TargetName="hint" Property="Opacity" Value="1"/>
                                        </Trigger>
                                        <Trigger Property="IsDragging" Value="True">
                                            <Setter TargetName="hint" Property="Opacity" Value="1"/>
                                            <Setter TargetName="hint" Property="Fill" Value="{DynamicResource PrimaryBrush}"/>
                                        </Trigger>
                                    </ControlTemplate.Triggers>
                                </ControlTemplate>
                            </Thumb.Template>
                        </Thumb>
                    </Grid>
                </Border>

                <!-- RESIZE GRIP. A Thumb rather than a GridSplitter: a splitter resizes the two
                     columns either side of it, and this column's neighbor is the 24px rail,
                     which must never move. Driving TreeCol's width by hand lets the star column
                     absorb the change instead, and keeps the drag from fighting the collapse
                     animation, which sets that same Width property (TreePanel.cs).
                     Spans both rows so the whole edge is grabbable, favorites included, and
                     sits last so it is above the edge fades. -->
                <Thumb x:Name="TreeResizeGrip" Grid.RowSpan="2" Panel.ZIndex="50"
                       HorizontalAlignment="Right" Width="5" Cursor="SizeWE"
                       DragDelta="TreeResizeGrip_DragDelta" DragCompleted="TreeResizeGrip_DragCompleted">
                    <Thumb.Template>
                        <ControlTemplate TargetType="Thumb">
                            <!-- Transparent, not empty: a Border with no Background is not
                                 hit-testable, so the grip would be invisible AND unusable. -->
                            <Border x:Name="grip" Background="Transparent">
                                <Rectangle x:Name="hint" Width="1" HorizontalAlignment="Right"
                                           Fill="{DynamicResource TreeLineBrush}" Opacity="0"/>
                            </Border>
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsMouseOver" Value="True">
                                    <Setter TargetName="hint" Property="Opacity" Value="1"/>
                                </Trigger>
                                <Trigger Property="IsDragging" Value="True">
                                    <Setter TargetName="hint" Property="Opacity" Value="1"/>
                                    <Setter TargetName="hint" Property="Fill" Value="{DynamicResource PrimaryBrush}"/>
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Thumb.Template>
                </Thumb>
            </Grid>

            <!-- COLUMN 1 - ICON RAIL, on the tree's inner lip. That placement is the
                 KillerNotes / KillerPDF pattern and it is the point of it: the icons sit right
                 next to the results whether the tree is open or shut and never move when it
                 collapses. Putting the rail on the window's outer edge instead makes them jump.
                 Layout is the family standard: ONE chevron pinned at the top that collapses the
                 sidebars, and a bottom stack of feature toggles. The 2px left margin on
                 centered elements is a 1px shift toward the pane, so the icons read as
                 centered on the strip. -->
            <Grid Grid.Column="1">
                <!-- Collapses THIS sidebar - the tree - and nothing else, exactly like
                     KillerNotes. The tree is the sidebar's default content, so it needs no
                     separate rail icon; the search panel on the far right is not this
                     chevron's business and has its own toggle below. -->
                <Button x:Name="SidebarToggleBtn" Style="{StaticResource RailButton}"
                        Content="&#xE76B;" FontSize="12"
                        VerticalAlignment="Top" HorizontalAlignment="Center" Margin="2,10,0,0"
                        ToolTip="{DynamicResource Str_TT_CollapseSidebar}" Click="TreePanel_Click"/>
                <StackPanel x:Name="RailBottom" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="2,0,0,6">
                    <!-- E721 (magnifier): the search panel, out on the right edge. Glyph never
                         changes - RailButton draws it in TextBrush and switches to the accent
                         on Tag="on", which is the open/shut tell. -->
                    <Button x:Name="SearchPanelBtn" Style="{StaticResource RailButton}" Content="&#xE721;"
                            FontSize="12" Margin="0,0,0,10" Click="SearchPanel_Click"
                            ToolTip="{DynamicResource Str_TT_SearchPanel}"/>
                    <!-- E734 (star): the saved-locations slide-up under the tree
                         (Bookmarks.cs). Accents while open, like the search toggle. -->
                    <Button x:Name="BookmarksBtn" Style="{StaticResource RailButton}" Content="&#xE734;"
                            FontSize="12" Margin="0,0,0,10" Click="BookmarksBtn_Click"
                            ToolTip="{DynamicResource Str_TT_Bookmarks}"/>
                    <!-- E8A1 (list): results density. Click cycles Comfortable -> Compact ->
                         Minimal, the wheel steps through them - the same gesture and the same
                         glyph KillerNotes uses for its sidebar density (Density.cs). -->
                    <Button x:Name="DensityBtn" Style="{StaticResource RailButton}" Content="&#xE8A1;"
                            FontSize="12" Margin="0,0,0,10" Click="Density_Click"
                            MouseWheel="Density_MouseWheel"
                            ToolTip="{DynamicResource Str_TT_Density}"/>
                    <!-- E9A6 (two panes): open or close the second pane, right-click flips
                         side-by-side / stacked. On the rail rather than in a pane toolbar
                         because it acts on the WINDOW - in the toolbar there were two of them,
                         one per pane, doing the identical thing, and either could be shed into
                         the overflow chevron on a narrow split. Accents while open, like the
                         search and bookmarks toggles above. -->
                    <Button x:Name="DualPaneRailBtn" Style="{StaticResource RailButton}" Content="&#xE9A6;"
                            FontSize="12" Margin="0,0,0,10" Click="DualPane_Click"
                            MouseRightButtonUp="DualPaneOrient_Click"
                            ToolTip="{DynamicResource Str_TT_DualPane}"/>
                    <!-- E70F (pencil): a blank document in a new tab in the FOCUSED pane, the
                         same glyph an editor tab carries (EditorTabs.GlyphEdit). No shortcut of
                         its own - F7 is the editor key and it belongs to the row you have
                         selected; this is the one way in that starts from nothing, and nothing
                         is written to disk until the first save asks where it goes. -->
                    <Button x:Name="NewDocRailBtn" Style="{StaticResource RailButton}" Content="&#xE70F;"
                            FontSize="12" Margin="0,0,0,10" Click="NewDoc_Click"
                            ToolTip="{DynamicResource Str_TT_NewDoc}"/>
                    <!-- E756 (command prompt): opens a PowerShell here on a left click, and
                         right-click picks the shell. Four rows rather than four rail icons -
                         the rail is family furniture and a column of near-identical prompts
                         would read as clutter, while the pair you actually reach for most is
                         one click and one chord away regardless (F8 / Ctrl+F8). -->
                    <Button x:Name="TerminalRailBtn" Style="{StaticResource RailButton}" Content="&#xE756;"
                            FontSize="12" Margin="0,0,0,10" Click="TerminalRail_Click"
                            ToolTip="{DynamicResource Str_TT_Terminal}">
                        <Button.ContextMenu>
                            <ContextMenu Placement="Top">
                                <MenuItem Header="{DynamicResource Str_Term_PowerShell}" Click="RailShellPs_Click" InputGestureText="F8">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE756;"/></MenuItem.Icon>
                                </MenuItem>
                                <MenuItem Header="{DynamicResource Str_Term_PowerShellAdmin}" Click="RailShellPsAdmin_Click" InputGestureText="Ctrl+F8">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE7EF;"/></MenuItem.Icon>
                                </MenuItem>
                                <Separator/>
                                <MenuItem Header="{DynamicResource Str_Term_Cmd}" Click="RailShellCmd_Click" InputGestureText="Shift+F8">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE756;"/></MenuItem.Icon>
                                </MenuItem>
                                <MenuItem Header="{DynamicResource Str_Term_CmdAdmin}" Click="RailShellCmdAdmin_Click" InputGestureText="Ctrl+Shift+F8">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE7EF;"/></MenuItem.Icon>
                                </MenuItem>
                                <Separator/>
                                <!-- Rows are built as the submenu OPENS (ProfileMenu.cs), from
                                     the PowerShell hosts actually installed - PowerShell 7 gets
                                     installed on a machine mid-session often enough that a fixed
                                     pair would go on lying for the rest of the session. The
                                     placeholder child is what makes WPF draw the arrow and fire
                                     SubmenuOpened at all; it is replaced before it is seen. -->
                                <MenuItem Header="{DynamicResource Str_Prof_Edit}" InputGestureText="Ctrl+,"
                                          SubmenuOpened="RailProfileMenu_Opened">
                                    <MenuItem.Icon><TextBlock Style="{StaticResource MenuGlyph}" Text="&#xE70F;"/></MenuItem.Icon>
                                    <MenuItem/>
                                </MenuItem>
                            </ContextMenu>
                        </Button.ContextMenu>
                    </Button>
                    <!-- "?" (a literal, in Consolas): the shortcuts card, F1. Sits directly above
                         the globe, which is where KillerNotes and KillerScan put it - the rail
                         order is family furniture, so it has to match. -->
                    <Button Style="{StaticResource RailButton}" Content="?"
                            FontFamily="Consolas" FontSize="18" Margin="0,0,0,10"
                            Click="Shortcuts_Click" ToolTip="{DynamicResource Str_Help_Shortcuts}"/>
                    <!-- E774 (globe): the locale menu, filled on click by BuildLanguageMenu
                         (Language.cs). Placement="Top" so it opens upward off the rail's
                         bottom rather than off the bottom edge of the window. -->
                    <Button x:Name="LangButton" Style="{StaticResource RailButton}" Content="&#xE774;"
                            Margin="0,0,0,10" Click="LangButton_Click"
                            ToolTip="{DynamicResource Str_TT_Language}">
                        <Button.ContextMenu>
                            <ContextMenu x:Name="LangMenu" Placement="Top"/>
                        </Button.ContextMenu>
                    </Button>
                    <!-- E790 (paint roller): the theme + accent flyout (ThemePopup, below). -->
                    <Button x:Name="ThemeButton" Style="{StaticResource RailButton}" Content="&#xE790;"
                            Click="ThemeButton_Click" ToolTip="{DynamicResource Str_TT_Theme}"/>
                </StackPanel>
            </Grid>

            <!-- COLUMN 5 - SEARCH CONFIG, out on the right edge (textured, flows into the bars
                 above / footer below). Collapsed by default and toggled from the rail. -->
            <Grid Grid.Column="5" x:Name="SearchPanel" Visibility="Collapsed">
              <DockPanel Background="Transparent" LastChildFill="True">
                <Border DockPanel.Dock="Bottom" Padding="12,8">
                    <StackPanel>
                        <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*"/>
                                <ColumnDefinition Width="Auto"/>
                            </Grid.ColumnDefinitions>
                            <Button Grid.Column="0" x:Name="SearchButton" Content="{DynamicResource Str_Btn_Search}" Style="{StaticResource OutlineButton}" Height="32" FontSize="13" Click="Search_Click"/>
                            <!-- New search: opens a fresh tab -->
                            <Button Grid.Column="1" Content="+" Width="32" Height="32" Margin="6,0,0,0" Padding="0"
                                    FontFamily="Consolas" FontSize="15" Style="{StaticResource SurfaceButton}"
                                    ToolTip="{DynamicResource Str_TT_NewTab}" Click="NewTab_Click"/>
                        </Grid>
                        <Button Content="{DynamicResource Str_Btn_Clear}" Style="{StaticResource SurfaceButton}" Height="28" Margin="0,6,0,0" Click="Clear_Click"/>
                    </StackPanel>
                </Border>

                <!-- Terms over filters with a draggable divider between them, clamped so
                     neither section can be crushed against an edge. -->
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*" MinHeight="140"/>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="Auto" MinHeight="80" MaxHeight="430"/>
                    </Grid.RowDefinitions>

                <!-- Bottom-anchored so any slack in the row sits ABOVE the section: the
                     collapsed "advanced" line seats flat against the buttons below. -->
                <Border Grid.Row="2" Padding="12,8,12,2" VerticalAlignment="Bottom">
                    <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled">
                    <StackPanel>
                        <TextBlock Text="{DynamicResource Str_Lbl_Filters}" Style="{StaticResource SectionHeader}"/>

                        <!-- Filter rows: [field v] on top, [condition toggle][value] below. AND-ed with
                             the terms. The condition is a toggle button with SHORT localized words
                             (is/not, before/after, over/under) so nothing ever truncates. -->
                            <ItemsControl x:Name="FiltersList">
                                <ItemsControl.ItemTemplate>
                                    <DataTemplate DataType="{x:Type models:SearchFilter}">
                                        <Border Background="{DynamicResource SurfaceBrush}" BorderBrush="{DynamicResource CardBorderBrush}"
                                                BorderThickness="1" CornerRadius="5" Margin="0,0,0,6" Padding="6" Effect="{StaticResource ShadowBar}">
                                            <Grid>
                                            <Border IsHitTestVisible="False" CornerRadius="4" Margin="-6"
                                                    Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                                            <StackPanel>
                                                <Grid Margin="0,0,0,4">
                                                    <Grid.ColumnDefinitions>
                                                        <ColumnDefinition Width="*"/>
                                                        <ColumnDefinition Width="4"/>
                                                        <ColumnDefinition Width="Auto"/>
                                                    </Grid.ColumnDefinitions>
                                                    <ComboBox Grid.Column="0" SelectedIndex="{Binding FieldIndex, Mode=TwoWay}">
                                                        <ComboBoxItem Content="{DynamicResource Str_Filter_Ext}"/>
                                                        <ComboBoxItem Content="{DynamicResource Str_Filter_Date}"/>
                                                        <ComboBoxItem Content="{DynamicResource Str_Filter_Size}"/>
                                                    </ComboBox>
                                                    <Button Grid.Column="2" Content="x" Style="{StaticResource DangerButton}" Width="22" Height="22" Padding="0"
                                                            Tag="{Binding}" Click="RemoveFilter_Click"/>
                                                </Grid>
                                                <Grid>
                                                    <Grid.ColumnDefinitions>
                                                        <ColumnDefinition Width="74"/>
                                                        <ColumnDefinition Width="6"/>
                                                        <ColumnDefinition Width="*"/>
                                                    </Grid.ColumnDefinitions>
                                                    <Button Grid.Column="0" Style="{StaticResource ModeButton}" Width="74" Height="26"
                                                            Tag="{Binding}" Click="ToggleFilterCondition_Click">
                                                        <TextBlock>
                                                            <TextBlock.Style>
                                                                <Style TargetType="TextBlock">
                                                                    <Style.Triggers>
                                                                        <MultiDataTrigger>
                                                                            <MultiDataTrigger.Conditions>
                                                                                <Condition Binding="{Binding FieldIndex}" Value="0"/>
                                                                                <Condition Binding="{Binding ConditionIndex}" Value="0"/>
                                                                            </MultiDataTrigger.Conditions>
                                                                            <Setter Property="Text" Value="{DynamicResource Str_Cond_Is}"/>
                                                                        </MultiDataTrigger>
                                                                        <MultiDataTrigger>
                                                                            <MultiDataTrigger.Conditions>
                                                                                <Condition Binding="{Binding FieldIndex}" Value="0"/>
                                                                                <Condition Binding="{Binding ConditionIndex}" Value="1"/>
                                                                            </MultiDataTrigger.Conditions>
                                                                            <Setter Property="Text" Value="{DynamicResource Str_Cond_IsNot}"/>
                                                                        </MultiDataTrigger>
                                                                        <MultiDataTrigger>
                                                                            <MultiDataTrigger.Conditions>
                                                                                <Condition Binding="{Binding FieldIndex}" Value="1"/>
                                                                                <Condition Binding="{Binding ConditionIndex}" Value="0"/>
                                                                            </MultiDataTrigger.Conditions>
                                                                            <Setter Property="Text" Value="{DynamicResource Str_Cond_Before}"/>
                                                                        </MultiDataTrigger>
                                                                        <MultiDataTrigger>
                                                                            <MultiDataTrigger.Conditions>
                                                                                <Condition Binding="{Binding FieldIndex}" Value="1"/>
                                                                                <Condition Binding="{Binding ConditionIndex}" Value="1"/>
                                                                            </MultiDataTrigger.Conditions>
                                                                            <Setter Property="Text" Value="{DynamicResource Str_Cond_After}"/>
                                                                        </MultiDataTrigger>
                                                                        <MultiDataTrigger>
                                                                            <MultiDataTrigger.Conditions>
                                                                                <Condition Binding="{Binding FieldIndex}" Value="2"/>
                                                                                <Condition Binding="{Binding ConditionIndex}" Value="0"/>
                                                                            </MultiDataTrigger.Conditions>
                                                                            <Setter Property="Text" Value="{DynamicResource Str_Cond_Larger}"/>
                                                                        </MultiDataTrigger>
                                                                        <MultiDataTrigger>
                                                                            <MultiDataTrigger.Conditions>
                                                                                <Condition Binding="{Binding FieldIndex}" Value="2"/>
                                                                                <Condition Binding="{Binding ConditionIndex}" Value="1"/>
                                                                            </MultiDataTrigger.Conditions>
                                                                            <Setter Property="Text" Value="{DynamicResource Str_Cond_Smaller}"/>
                                                                        </MultiDataTrigger>
                                                                    </Style.Triggers>
                                                                </Style>
                                                            </TextBlock.Style>
                                                        </TextBlock>
                                                    </Button>
                                                    <Grid Grid.Column="2">
                                                        <Grid.ColumnDefinitions>
                                                            <ColumnDefinition Width="*"/>
                                                            <ColumnDefinition Width="Auto"/>
                                                        </Grid.ColumnDefinitions>
                                                        <TextBox Grid.ColumnSpan="2" Text="{Binding Text, UpdateSourceTrigger=PropertyChanged}"
                                                                 Visibility="{Binding IsExt, Converter={StaticResource BoolToVis}}"/>
                                                        <DatePicker Grid.ColumnSpan="2" SelectedDate="{Binding Date, Mode=TwoWay}"
                                                                    Visibility="{Binding IsDate, Converter={StaticResource BoolToVis}}"/>
                                                        <TextBox Grid.Column="0" Text="{Binding SizeText, UpdateSourceTrigger=PropertyChanged}"
                                                                 Visibility="{Binding IsSize, Converter={StaticResource BoolToVis}}"/>
                                                        <ComboBox Grid.Column="1" Width="56" Margin="4,0,0,0" SelectedIndex="{Binding UnitIndex, Mode=TwoWay}"
                                                                  Visibility="{Binding IsSize, Converter={StaticResource BoolToVis}}">
                                                            <ComboBoxItem Content="KB"/>
                                                            <ComboBoxItem Content="MB"/>
                                                        </ComboBox>
                                                    </Grid>
                                                </Grid>
                                            </StackPanel>
                                            </Grid>
                                        </Border>
                                    </DataTemplate>
                                </ItemsControl.ItemTemplate>
                            </ItemsControl>
                        <Button HorizontalAlignment="Left" Content="{DynamicResource Str_Btn_AddFilter}" Style="{StaticResource SurfaceButton}"
                                Padding="8,3" FontSize="10" Margin="0,2,0,0" Click="AddFilter_Click"/>

                        <!-- "advanced" accordion: include/exclude/case collapse out of the way -->
                        <Border Margin="0,10,0,0" BorderBrush="{DynamicResource CardBorderBrush}" BorderThickness="0,1,0,0" Padding="0,7,0,2">
                          <StackPanel>
                            <Border Background="Transparent" Cursor="Hand" MouseLeftButtonUp="AdvancedToggle_Click">
                                <StackPanel Orientation="Horizontal">
                                    <TextBlock x:Name="AdvancedChevron" Text="&#xE76C;" FontFamily="Segoe MDL2 Assets" FontSize="9"
                                               Foreground="{DynamicResource DimTextBrush}" VerticalAlignment="Center" Margin="0,1,7,0"/>
                                    <TextBlock Text="{DynamicResource Str_Lbl_Advanced}" Foreground="{DynamicResource DimTextBrush}"
                                               FontFamily="{DynamicResource MonoFont}" FontSize="10" VerticalAlignment="Center"/>
                                </StackPanel>
                            </Border>
                            <StackPanel x:Name="AdvancedPanel" Visibility="Collapsed">
                        <Grid Margin="0,9,0,3">
                            <TextBlock Text="{DynamicResource Str_Lbl_Include}" Foreground="{DynamicResource DimTextBrush}" FontFamily="{DynamicResource MonoFont}" FontSize="10" VerticalAlignment="Center"/>
                            <!-- Pattern cheat-sheet card, like KillerPDF's keyboard shortcuts overlay -->
                            <Button HorizontalAlignment="Right" Width="16" Height="16" Padding="0" Cursor="Hand"
                                    ToolTip="{DynamicResource Str_TT_PatternHelp}" Click="PatternHelp_Click">
                                <Button.Template>
                                    <ControlTemplate TargetType="Button">
                                        <Border x:Name="hb" Background="Transparent" BorderBrush="{DynamicResource InputBorderBrush}" BorderThickness="1" CornerRadius="8">
                                            <TextBlock x:Name="ht" Text="?" Foreground="{DynamicResource DimTextBrush}" HorizontalAlignment="Center" VerticalAlignment="Center" FontFamily="Consolas" FontSize="10"/>
                                        </Border>
                                        <ControlTemplate.Triggers>
                                            <Trigger Property="IsMouseOver" Value="True">
                                                <Setter TargetName="hb" Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
                                                <Setter TargetName="ht" Property="Foreground" Value="{DynamicResource PrimaryBrush}"/>
                                            </Trigger>
                                        </ControlTemplate.Triggers>
                                    </ControlTemplate>
                                </Button.Template>
                            </Button>
                        </Grid>
                        <TextBox x:Name="IncludePatternsBox" Text="*.*" ToolTip="{DynamicResource Str_TT_Include}"/>
                        <TextBlock Text="{DynamicResource Str_Lbl_Exclude}" Foreground="{DynamicResource DimTextBrush}" FontFamily="{DynamicResource MonoFont}" FontSize="10" Margin="0,7,0,3"/>
                        <TextBox x:Name="ExcludePatternsBox" Text="" ToolTip="{DynamicResource Str_TT_Exclude}"/>
                        <CheckBox x:Name="CaseSensitiveCheck" Content="{DynamicResource Str_Chk_CaseSensitive}" Foreground="{DynamicResource MutedTextBrush}" Margin="0,9,0,0"/>
                            </StackPanel>
                          </StackPanel>
                        </Border>
                    </StackPanel>
                    </ScrollViewer>
                </Border>

                <!-- Draggable divider between terms and filters -->
                <GridSplitter Grid.Row="1" Height="7" HorizontalAlignment="Stretch" Background="Transparent"
                              ResizeBehavior="PreviousAndNext" ResizeDirection="Rows"
                              Cursor="SizeNS" ShowsPreview="False" Focusable="False">
                    <GridSplitter.Template>
                        <ControlTemplate TargetType="GridSplitter">
                            <Border Background="Transparent">
                                <Border x:Name="line" Height="1" VerticalAlignment="Center"
                                        Background="{DynamicResource CardBorderBrush}" Margin="12,0"/>
                            </Border>
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsMouseOver" Value="True"><Setter TargetName="line" Property="Background" Value="{DynamicResource PrimaryBrush}"/></Trigger>
                                <Trigger Property="IsDragging" Value="True"><Setter TargetName="line" Property="Background" Value="{DynamicResource PrimaryBrush}"/></Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </GridSplitter.Template>
                </GridSplitter>

                <Border Grid.Row="0" Padding="12,8,12,10">
                    <DockPanel LastChildFill="True">
                        <TextBlock DockPanel.Dock="Top" Text="{DynamicResource Str_Lbl_SearchTerms}" Style="{StaticResource SectionHeader}"/>
                        <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled">
                            <ItemsControl x:Name="TermsList">
                                <ItemsControl.ItemTemplate>
                                    <DataTemplate DataType="{x:Type models:TermGroup}">
                                        <Border Background="{DynamicResource SurfaceBrush}" BorderBrush="{DynamicResource CardBorderBrush}"
                                                BorderThickness="1" CornerRadius="5" Margin="0,0,0,8" Padding="6" Effect="{StaticResource ShadowBar}">
                                            <Grid>
                                            <Border IsHitTestVisible="False" CornerRadius="4" Margin="-6"
                                                    Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                                            <StackPanel>
                                                <!-- Group header: ANY/ALL combiner toggle + remove-group -->
                                                <Grid Margin="0,0,0,5">
                                                    <Button HorizontalAlignment="Left" Content="{Binding ModeLabel, Mode=OneWay}" Style="{StaticResource ModeButton}"
                                                            Width="44" Height="20" FontSize="10" ToolTip="{Binding ModeTooltip}" Tag="{Binding}" Click="ToggleGroupMode_Click"/>
                                                </Grid>
                                                <ItemsControl ItemsSource="{Binding Terms}">
                                                    <ItemsControl.ItemTemplate>
                                                        <DataTemplate DataType="{x:Type models:SearchTerm}">
                                                            <Grid Margin="0,0,0,4">
                                                                <Grid.ColumnDefinitions>
                                                                    <ColumnDefinition Width="62"/>
                                                                    <ColumnDefinition Width="6"/>
                                                                    <ColumnDefinition Width="*"/>
                                                                    <ColumnDefinition Width="5"/>
                                                                    <ColumnDefinition Width="Auto"/>
                                                                    <ColumnDefinition Width="4"/>
                                                                    <ColumnDefinition Width="Auto"/>
                                                                </Grid.ColumnDefinitions>
                                                                <Button Grid.Column="0" Content="{Binding ModeName, Mode=OneWay}" Style="{StaticResource ModeButton}"
                                                                        ToolTip="{Binding ModeTooltip}" Tag="{Binding}" Click="ToggleMode_Click"/>
                                                                <TextBox Grid.Column="2" Text="{Binding Pattern, UpdateSourceTrigger=PropertyChanged}" ToolTip="{Binding ModeTooltip}"/>
                                                                <TextBlock Grid.Column="4" Text="{Binding MatchBadge}" Foreground="{DynamicResource PrimaryBrush}"
                                                                           FontFamily="{DynamicResource MonoFont}" FontSize="10" VerticalAlignment="Center"/>
                                                                <Button Grid.Column="6" Content="x" Style="{StaticResource DangerButton}" Width="22" Height="22" Padding="0"
                                                                        Tag="{Binding}" Click="RemoveTerm_Click"/>
                                                            </Grid>
                                                        </DataTemplate>
                                                    </ItemsControl.ItemTemplate>
                                                </ItemsControl>
                                                <Button HorizontalAlignment="Left" Content="{DynamicResource Str_Btn_AddTerm}" Style="{StaticResource SurfaceButton}"
                                                        Padding="8,3" FontSize="10" Margin="0,2,0,0" Tag="{Binding}" Click="AddTerm_Click"/>
                                            </StackPanel>
                                            </Grid>
                                        </Border>
                                    </DataTemplate>
                                </ItemsControl.ItemTemplate>
                            </ItemsControl>
                        </ScrollViewer>
                    </DockPanel>
                </Border>
                </Grid>
              </DockPanel>
            </Grid>
            <!-- end COLUMN 5 search panel -->

            <!-- COLUMN 3 - THE PANES. One tab = one whole search or one folder. Tab visuals
                 mirror KillerPDF: active tab takes the pane background with a 3px accent
                 stripe on top and a soft shadow.
                 PaneHost carries BOTH panes on one 3x3 grid rather than one grid per
                 orientation. Side-by-side uses the columns and collapses the rows; stacked
                 uses the rows and collapses the columns; DualPane.cs moves RightPane and the
                 splitter between the two slots. One host means the panes are never rebuilt
                 when the orientation flips, so neither one loses its tabs or its scroll
                 position. Second pane is Collapsed until asked for, and its column/row is 0
                 wide, so a single-pane window lays out exactly as it did before. -->
            <Grid Grid.Column="3" x:Name="PaneHost">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition x:Name="PaneColA" Width="*" MinWidth="180"/>
                    <ColumnDefinition x:Name="PaneColSplit" Width="0"/>
                    <ColumnDefinition x:Name="PaneColB" Width="0" MinWidth="0"/>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition x:Name="PaneRowA" Height="*" MinHeight="120"/>
                    <RowDefinition x:Name="PaneRowSplit" Height="0"/>
                    <RowDefinition x:Name="PaneRowB" Height="0" MinHeight="0"/>
                </Grid.RowDefinitions>

                <local:FilePane x:Name="LeftPane" Grid.Column="0" Grid.Row="0"/>

                <!-- Both splitters exist; DualPane.cs shows whichever the orientation needs.
                     ResizeBehavior is PreviousAndNext so the drag moves the boundary between
                     the two panes and nothing else. -->
                <GridSplitter x:Name="PaneSplitV" Grid.Column="1" Grid.Row="0" Width="6"
                              HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                              Background="Transparent" Cursor="SizeWE" Visibility="Collapsed"
                              ResizeBehavior="PreviousAndNext" ResizeDirection="Columns"/>
                <GridSplitter x:Name="PaneSplitH" Grid.Row="1" Grid.Column="0" Height="6"
                              HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
                              Background="Transparent" Cursor="SizeNS" Visibility="Collapsed"
                              ResizeBehavior="PreviousAndNext" ResizeDirection="Rows"/>

                <local:FilePane x:Name="RightPane" Grid.Column="2" Grid.Row="0"
                                Visibility="Collapsed"/>
            </Grid>
        </Grid>

        <!-- ══════════ ROW 2 - FOOTER (blends with the sidebar/panes, no divider line) ══════════ -->
        <Border Grid.Row="2" Background="{DynamicResource BackgroundBrush}">
          <!-- Two columns: the status area takes what is left, the version block sizes to its
               content on the right. The portable badge is deliberately NOT a column - it stays
               a CENTERED overlay spanning both, which is where it has always sat. Giving it its
               own column pinned it against the version text instead.
               Because it overlays, column 0 runs underneath it and cannot bound the status line
               on its own - ElideFooterStatus (MainWindow.xaml.cs) clamps the line at the badge's
               left edge while the badge is showing, and drops the clamp once the app is
               installed and the badge is gone, so the line then runs on toward the version text.
               The short per-TAB facts (scanned / matches / query) are NOT here - they live in
               each pane's own status bar (FilePane.xaml). This bar carries the one item that
               needs real width. -->
          <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>
            <Border Grid.ColumnSpan="2" IsHitTestVisible="False" Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
            <!-- 10.5 left, not the 16 the rest of the family uses: the status dot is the first
                 thing in this row and it should sit on the same vertical line as the icon rail
                 above it (RailCol, 24 wide, so its icons center at 12). The dot is 3 wide, so
                 the row starts at 12 - 1.5. Everything after it moves with it, which is the
                 "tiny bit left" this is for. -->
            <Grid Grid.Column="0" VerticalAlignment="Center" Margin="10.5,0,12,0">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="Auto"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>
                <!-- App-wide zoom level (AppScale.cs). Leftmost in the status area at the same
                     16px inset, ChromeTextBrush, mono 11.5 - the exact slot and treatment
                     KillerScan gives its footer StatusText (MainWindow.xaml row 3). Hidden at
                     100%; a collapsed element takes no width or margin. -->
                <TextBlock x:Name="AppScaleLabel" Grid.Column="0" Visibility="Collapsed" Foreground="{DynamicResource ChromeTextBrush}"
                           FontFamily="{DynamicResource MonoFont}" FontSize="11.5" VerticalAlignment="Center"
                           Margin="0,0,14,0" ToolTip="{DynamicResource Str_TT_AppSize}"/>
                <!-- Traffic light: OkBrush / WarnBrush / DangerRed, set by ApplyStatusTone. The
                     resting state is green, not the accent - see MainWindow.xaml.cs. -->
                <Border x:Name="StatusDot" Grid.Column="1" Width="3" Background="{DynamicResource OkBrush}" Margin="0,3,7,3" CornerRadius="2"/>
                <!-- The running commentary: "Ready", "Opening C:\...", "164 item(s)", "Cannot
                     open X". No MaxWidth - the * column IS the bound, so the line uses whatever
                     the window gives it: it stops at the portable badge while that is showing,
                     and once the app is installed the badge collapses to zero width and the
                     line simply runs on toward the version text.
                     NO TextTrimming: that ellipsizes the TAIL, which on a path throws away the
                     file name - the only part worth reading. ElideFooterStatus
                     (MainWindow.xaml.cs) trims from the FRONT instead, and SizeChanged
                     re-runs it so a window resize re-cuts the path.
                     11.5 status / 10 corner type is the family footer standard. -->
                <TextBlock x:Name="StatusText" Grid.Column="2" Text="{DynamicResource Str_Status_Ready}" Foreground="{DynamicResource TextFooter}"
                           FontFamily="{DynamicResource MonoFont}" FontSize="11.5" VerticalAlignment="Center"
                           SizeChanged="StatusText_SizeChanged"/>
            </Grid>
            <!-- Portable mode indicator (hidden when installed), same as KillerScan. Centered
                 across the whole footer, NOT parked in a column - a column pins it next to the
                 version text. IsVisibleChanged re-runs the status elision, because the line's
                 usable width changes the moment this appears or goes away. -->
            <StackPanel x:Name="PortableBadge" Grid.ColumnSpan="2" Orientation="Horizontal"
                        HorizontalAlignment="Center" VerticalAlignment="Center" Visibility="Collapsed"
                        IsVisibleChanged="PortableBadge_IsVisibleChanged">
                <TextBlock Text="{DynamicResource Str_Portable}" Foreground="{DynamicResource TextFooter}"
                           FontFamily="Consolas" FontSize="9" VerticalAlignment="Center" Margin="0,0,8,0"/>
                <Button x:Name="InstallBtn" Content="{DynamicResource Str_Btn_Install}" Click="Install_Click"
                        Style="{StaticResource OutlineButton}" FontFamily="Segoe UI" FontSize="10" Padding="8,1"
                        VerticalAlignment="Center"/>
            </StackPanel>
            <StackPanel Grid.Column="1" Orientation="Horizontal" VerticalAlignment="Center" Margin="0,0,16,0">
                <TextBlock x:Name="VersionLabel" Text="v0.99" Foreground="{DynamicResource TextFooter}" FontFamily="{DynamicResource MonoFont}" FontSize="10" VerticalAlignment="Center" Margin="0,0,12,0"
                           Cursor="Hand" ToolTip="About" MouseLeftButtonUp="VersionLabel_Click"/>
                <!-- 14px trailing margin keeps the copyright clear of the corner grip (family standard) -->
                <TextBlock FontSize="10" VerticalAlignment="Center" FontFamily="{DynamicResource MonoFont}" Margin="0,0,14,0">
                    <Run Text="&#x00A9; 2026 " Foreground="{DynamicResource TextFooter}"/>
                    <Hyperlink NavigateUri="https://thekiller.net" RequestNavigate="Hyperlink_RequestNavigate" Foreground="{DynamicResource TextFooter}" TextDecorations="None">
                        <Run Text="Steve the Killer"/>
                    </Hyperlink>
                </TextBlock>
            </StackPanel>
            <!-- Bottom-right resize grip: dotted triangle at the content corner, forwards a
                 HTBOTTOMRIGHT resize to Windows on drag (same as KillerPDF/KillerScan). -->
            <Canvas x:Name="ResizeGripDots" Grid.ColumnSpan="2" Width="13" Height="13"
                    HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,0,4,4"
                    Background="Transparent" Cursor="SizeNWSE"
                    MouseLeftButtonDown="ResizeGrip_MouseDown">
                <Rectangle Canvas.Left="10" Canvas.Top="2"  Width="2" Height="2" Fill="{DynamicResource DimTextBrush}"/>
                <Rectangle Canvas.Left="6"  Canvas.Top="6"  Width="2" Height="2" Fill="{DynamicResource DimTextBrush}"/>
                <Rectangle Canvas.Left="10" Canvas.Top="6"  Width="2" Height="2" Fill="{DynamicResource DimTextBrush}"/>
                <Rectangle Canvas.Left="2"  Canvas.Top="10" Width="2" Height="2" Fill="{DynamicResource DimTextBrush}"/>
                <Rectangle Canvas.Left="6"  Canvas.Top="10" Width="2" Height="2" Fill="{DynamicResource DimTextBrush}"/>
                <Rectangle Canvas.Left="10" Canvas.Top="10" Width="2" Height="2" Fill="{DynamicResource DimTextBrush}"/>
            </Canvas>
          </Grid>
        </Border>

        <!-- ══════════ ABOUT OVERLAY (dim backdrop + centered card) ══════════ -->
        <Grid x:Name="AboutOverlay" Grid.RowSpan="3" Panel.ZIndex="9000" Visibility="Collapsed"
              Background="#88000000" MouseLeftButtonDown="AboutOverlay_Click">
            <!-- Card structure copied from KillerScan (the rules for every About card):
                 the SHA-256 line is the ONLY thing that sets the width - it never wraps, so the
                 info panel sizes to it and the card sizes to the info panel. The header grid
                 below pins its width to that panel so a long tagline wraps instead of widening
                 the card. The drop shadow lives on a SEPARATE border so the card text never
                 renders through a bitmap effect (stays ClearType-crisp), and the whole surface
                 is grain-wrapped. -->
            <Grid VerticalAlignment="Center" HorizontalAlignment="Center" MouseLeftButtonDown="AboutCard_Click">
                <Border Background="{DynamicResource SurfaceBrush}" CornerRadius="6" IsHitTestVisible="False">
                    <Border.Effect><DropShadowEffect Color="Black" BlurRadius="26" ShadowDepth="5" Direction="270" Opacity="0.6"/></Border.Effect>
                </Border>
                <Border Background="{DynamicResource SurfaceBrush}" BorderBrush="{DynamicResource CardBorderBrush}"
                        BorderThickness="1" CornerRadius="6">
                    <Grid>
                        <Border IsHitTestVisible="False" CornerRadius="6"
                                Opacity="{DynamicResource GrainOpacity}" Background="{DynamicResource GrainTileBrush}"/>

                        <!-- Close X: glyph reddens on hover (foreground via style setter so the trigger wins) -->
                        <Button Content="&#x2715;" Click="AboutClose_Click" HorizontalAlignment="Right" VerticalAlignment="Top"
                                Width="28" Height="26" Margin="0,6,6,0" Panel.ZIndex="2" FontSize="11"
                                Background="Transparent" BorderThickness="0" Cursor="Hand">
                            <Button.Style>
                                <Style TargetType="Button">
                                    <Setter Property="Foreground" Value="{DynamicResource MutedTextBrush}"/>
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="Button">
                                                <Border Background="Transparent">
                                                    <ContentPresenter x:Name="cp" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                                </Border>
                                                <ControlTemplate.Triggers>
                                                    <Trigger Property="IsMouseOver" Value="True">
                                                        <Setter Property="Foreground" Value="#E04444"/>
                                                        <Setter TargetName="cp" Property="Effect">
                                                            <Setter.Value><DropShadowEffect Color="#000000" BlurRadius="4" ShadowDepth="1" Direction="270" Opacity="0.5"/></Setter.Value>
                                                        </Setter>
                                                    </Trigger>
                                                </ControlTemplate.Triggers>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </Button.Style>
                        </Button>

                        <StackPanel Margin="18,10,18,18">
                            <!-- Header: icon left, wordmark (links to the site) + tagline right.
                                 Width is pinned to the info panel below so the tagline wraps
                                 instead of widening the card - the SHA-256 line stays the driver. -->
                            <Grid Margin="0,4,0,14" Width="{Binding ActualWidth, ElementName=AboutInfoGrid}">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="Auto"/>
                                    <ColumnDefinition Width="*"/>
                                </Grid.ColumnDefinitions>
                                <Image x:Name="AboutIcon" Grid.Column="0" Width="58" Height="58" Margin="0,0,15,0" VerticalAlignment="Center"
                                       RenderOptions.BitmapScalingMode="HighQuality">
                                    <Image.Effect><DropShadowEffect Color="Black" BlurRadius="12" ShadowDepth="3" Direction="270" Opacity="0.55"/></Image.Effect>
                                </Image>
                                <StackPanel Grid.Column="1" VerticalAlignment="Center">
                                    <Grid Margin="0,0,0,4" HorizontalAlignment="Left" Cursor="Hand" ToolTip="killershell.net"
                                          Background="Transparent" MouseLeftButtonUp="Wordmark_Click">
                                        <TextBlock FontFamily="{DynamicResource WordmarkFont}" Margin="1,2,0,0" IsHitTestVisible="False"
                                                   Opacity="{DynamicResource IconShadowOpacity}"><TextBlock.Effect><BlurEffect Radius="2"/></TextBlock.Effect><Run Text="Killer" FontSize="22" Foreground="#C0000000"/><Run Text="Shell" FontSize="28.6" FontWeight="Bold" Foreground="#C0000000"/></TextBlock>
                                        <TextBlock FontFamily="{DynamicResource WordmarkFont}"><Run Text="Killer" FontSize="22" Foreground="{DynamicResource TextBrush}"/><Run Text="Shell" FontSize="28.6" FontWeight="Bold" Foreground="{DynamicResource PrimaryBrush}"/></TextBlock>
                                    </Grid>
                                    <!-- Tagline is composed here, not in the .xaml string files: GPLv3 and
                                         "Killer Tools" are proper nouns and stay out of the translations
                                         (same split KillerScan and KillerNotes use). -->
                                    <TextBlock FontSize="12" Foreground="{DynamicResource MutedTextBrush}" TextWrapping="Wrap"><Run Text="{DynamicResource Str_About_DescA}"/><Run Text="GPLv3 "/><Hyperlink NavigateUri="https://killertools.net" RequestNavigate="AboutLink_Navigate" Foreground="{DynamicResource PrimaryBrush}" TextDecorations="None">Killer Tools</Hyperlink><Run Text="{DynamicResource Str_About_DescB}"/></TextBlock>
                                </StackPanel>
                            </Grid>

                            <!-- Info panel - matte, lifted above the grainy card. The shadow lives on
                                 its own border so the field text never renders through a bitmap effect
                                 (stays ClearType-crisp). Field spacing and sizes match KillerScan. -->
                            <Grid x:Name="AboutInfoGrid">
                                <Border Background="{DynamicResource PaneBrush}" CornerRadius="4" IsHitTestVisible="False">
                                    <Border.Effect><DropShadowEffect Color="Black" BlurRadius="14" ShadowDepth="2" Direction="270" Opacity="0.5"/></Border.Effect>
                                </Border>
                                <Border Background="{DynamicResource PaneBrush}" CornerRadius="4" Padding="14,12,14,4">
                                    <StackPanel>
                                        <StackPanel Margin="0,0,0,10">
                                            <TextBlock Text="{DynamicResource Str_About_Version}" Foreground="{DynamicResource DimTextBrush}" FontFamily="Consolas" FontSize="10"/>
                                            <!-- One row, two ends: the version in the accent on the left, the
                                                 release date muted and italic hard right against the panel edge.
                                                 Bottom-aligned rather than centered so the two sizes sit on a
                                                 shared baseline. Only the version text is clickable. -->
                                            <Grid Margin="0,1,0,0">
                                                <TextBlock x:Name="AboutVersionBlock" Foreground="{DynamicResource PrimaryBrush}"
                                                           FontFamily="Consolas" FontSize="13" Cursor="Hand"
                                                           HorizontalAlignment="Left" VerticalAlignment="Bottom"
                                                           MouseLeftButtonUp="AboutVersion_Click"/>
                                                <TextBlock x:Name="AboutReleaseDateBlock" Foreground="{DynamicResource MutedTextBrush}"
                                                           FontFamily="Consolas" FontSize="11" FontStyle="Italic"
                                                           HorizontalAlignment="Right" VerticalAlignment="Bottom"/>
                                            </Grid>
                                        </StackPanel>
                                        <StackPanel Margin="0,0,0,10">
                                            <TextBlock Text="{DynamicResource Str_About_Publisher}" Foreground="{DynamicResource DimTextBrush}" FontFamily="Consolas" FontSize="10"/>
                                            <TextBlock x:Name="AboutPublisherBlock" Foreground="{DynamicResource TextBrush}" FontSize="12" Margin="0,1,0,0"/>
                                            <!-- Shown only on a signed exe, where the certificate subject is the
                                                 legal name - this ties it back to the name people know. The alias
                                                 itself is an accent link to thekiller.net; "AKA" stays muted so
                                                 the eye lands on the name (same plain-text + accent-link split as
                                                 the tagline above). -->
                                            <TextBlock x:Name="AboutAkaBlock" Visibility="Collapsed" Foreground="{DynamicResource MutedTextBrush}"
                                                       FontSize="11" Margin="0,3,0,0"><Run Text="AKA "/><Hyperlink NavigateUri="https://thekiller.net" RequestNavigate="AboutLink_Navigate" Foreground="{DynamicResource PrimaryBrush}" TextDecorations="None" ToolTip="thekiller.net"><Run x:Name="AboutAkaRun"/></Hyperlink></TextBlock>
                                        </StackPanel>
                                        <StackPanel Margin="0,0,0,10">
                                            <TextBlock Text="{DynamicResource Str_About_Thumbprint}" Foreground="{DynamicResource DimTextBrush}" FontFamily="Consolas" FontSize="10"/>
                                            <TextBlock x:Name="AboutThumbprintBlock" Foreground="{DynamicResource TextBrush}" FontFamily="Consolas" FontSize="11" TextWrapping="Wrap" Margin="0,1,0,0"/>
                                        </StackPanel>
                                        <StackPanel Margin="0,0,0,10">
                                            <TextBlock Text="{DynamicResource Str_About_Sha}" Foreground="{DynamicResource DimTextBrush}" FontFamily="Consolas" FontSize="10"/>
                                            <TextBlock x:Name="AboutSha256Block" Foreground="{DynamicResource TextBrush}" FontFamily="Consolas" FontSize="11" TextWrapping="NoWrap" Margin="0,1,0,0"/>
                                        </StackPanel>
                                    </StackPanel>
                                </Border>
                            </Grid>

                            <Button x:Name="AboutUpdateButton" Visibility="Collapsed" Margin="0,14,0,0" HorizontalAlignment="Left" Cursor="Hand" Click="AboutUpdateButton_Click">
                                <Button.Template>
                                    <ControlTemplate TargetType="Button">
                                        <!-- The caption INHERITS its color from this border rather than
                                             setting its own: hovering fills the border with the accent,
                                             and accent-on-accent left the label invisible. A trigger
                                             cannot reach the Content by TargetName - it is outside the
                                             template's namescope - so the color is carried down by
                                             TextElement.Foreground, which the ContentPresenter passes on. -->
                                        <Border x:Name="ub" Background="Transparent" BorderBrush="{DynamicResource PrimaryBrush}" BorderThickness="1" CornerRadius="4" Padding="12,6"
                                                TextElement.Foreground="{DynamicResource PrimaryBrush}">
                                            <ContentPresenter/>
                                        </Border>
                                        <ControlTemplate.Triggers>
                                            <Trigger Property="IsMouseOver" Value="True">
                                                <Setter TargetName="ub" Property="Background" Value="{DynamicResource PrimaryBrush}"/>
                                                <Setter TargetName="ub" Property="TextElement.Foreground" Value="{DynamicResource OnPrimaryBrush}"/>
                                            </Trigger>
                                        </ControlTemplate.Triggers>
                                    </ControlTemplate>
                                </Button.Template>
                                <!-- No Foreground here on purpose - an explicit one beats the inherited
                                     value and the hover swap above would never reach it. -->
                                <TextBlock x:Name="AboutUpdateText" FontSize="12"/>
                            </Button>
                        </StackPanel>
                    </Grid>
                </Border>
            </Grid>
        </Grid>

        <!-- ══════════ FONTS OVERLAY (dim backdrop + centered card) ══════════ -->
        <!-- One slot per surface that has its own face. Deliberately a dialog and not part of
             the theme flyout: a system font list runs to hundreds of entries, and a flyout is
             for things you pick at a glance. Built to take more rows without restructuring. -->
        <Grid x:Name="FontsOverlay" Grid.RowSpan="3" Panel.ZIndex="9000" Visibility="Collapsed"
              Background="#88000000" MouseLeftButtonDown="FontsOverlay_Click">
            <Border Width="420" VerticalAlignment="Center" HorizontalAlignment="Center"
                    Background="{DynamicResource SurfaceBrush}" BorderBrush="{DynamicResource CardBorderBrush}"
                    BorderThickness="1" CornerRadius="8" MouseLeftButtonDown="FontsCard_Click">
                <Border.Effect><DropShadowEffect Color="Black" BlurRadius="30" ShadowDepth="6" Direction="270" Opacity="0.6"/></Border.Effect>
                <Grid>
                <Border IsHitTestVisible="False" CornerRadius="7" Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                <StackPanel Margin="24,20">
                    <Grid Margin="0,0,0,14">
                        <TextBlock Text="{DynamicResource Str_Fonts_Title}" Style="{StaticResource SectionHeader}"
                                   FontSize="13" Margin="0" VerticalAlignment="Center"/>
                        <Button Content="&#xE8BB;" Click="FontsClose_Click" HorizontalAlignment="Right" VerticalAlignment="Top"
                                Width="30" Height="26" FontSize="10" FontFamily="Segoe MDL2 Assets"
                                Style="{StaticResource DangerButton}" BorderThickness="0"/>
                    </Grid>

                    <TextBlock Text="{DynamicResource Str_Fonts_App}" Foreground="{DynamicResource DimTextBrush}"
                               FontFamily="Consolas" FontSize="10" Margin="0,0,0,4"/>
                    <ComboBox x:Name="FontAppCombo" Height="26" FontSize="12" Margin="0,0,0,14"
                              SelectionChanged="FontCombo_Changed" PreviewMouseWheel="FontCombo_Wheel"/>

                    <TextBlock Text="{DynamicResource Str_Fonts_Terminal}" Foreground="{DynamicResource DimTextBrush}"
                               FontFamily="Consolas" FontSize="10" Margin="0,0,0,4"/>
                    <ComboBox x:Name="FontTermCombo" Height="26" FontSize="12"
                              SelectionChanged="FontCombo_Changed" PreviewMouseWheel="FontCombo_Wheel"/>

                    <!-- Size belongs to the two surfaces that show a WALL of monospaced text and
                         nothing else: a shell and a document. The rest of the app grows through
                         the wordmark zoom (AppScale.cs) instead, because a file list wants to
                         stay in proportion with its chrome. Ctrl+wheel inside either still
                         nudges the same value from the keyboard. -->
                    <Grid Margin="0,10,0,14">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <Slider x:Name="FontTermSize" Style="{StaticResource ThinSlider}"
                                Minimum="8" Maximum="28" SmallChange="1" LargeChange="1"
                                IsSnapToTickEnabled="True" TickFrequency="1"
                                ValueChanged="FontTermSize_Changed"/>
                        <TextBlock x:Name="FontTermSizeLabel" Grid.Column="1" Margin="10,0,0,0"
                                   MinWidth="26" TextAlignment="Right" VerticalAlignment="Center"
                                   Foreground="{DynamicResource MutedTextBrush}"
                                   FontFamily="Consolas" FontSize="11"/>
                    </Grid>

                    <!-- Editor text. Fixed-width only, filtered the same way the terminal list
                         is: a proportional face does not merely look wrong over code, it puts
                         every line number and every column of an indented block out of line. -->
                    <TextBlock Text="{DynamicResource Str_Fonts_Editor}" Foreground="{DynamicResource DimTextBrush}"
                               FontFamily="Consolas" FontSize="10" Margin="0,0,0,4"/>
                    <ComboBox x:Name="FontEditorCombo" Height="26" FontSize="12"
                              SelectionChanged="FontCombo_Changed" PreviewMouseWheel="FontCombo_Wheel"/>

                    <Grid Margin="0,10,0,0">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <Slider x:Name="FontEditorSize" Style="{StaticResource ThinSlider}"
                                Minimum="8" Maximum="28" SmallChange="1" LargeChange="1"
                                IsSnapToTickEnabled="True" TickFrequency="1"
                                ValueChanged="FontEditorSize_Changed"/>
                        <TextBlock x:Name="FontEditorSizeLabel" Grid.Column="1" Margin="10,0,0,0"
                                   MinWidth="26" TextAlignment="Right" VerticalAlignment="Center"
                                   Foreground="{DynamicResource MutedTextBrush}"
                                   FontFamily="Consolas" FontSize="11"/>
                    </Grid>

                    <TextBlock Text="{DynamicResource Str_Fonts_Hint}" Foreground="{DynamicResource DimTextBrush}"
                               FontSize="10.5" TextWrapping="Wrap" Margin="0,14,0,0"/>
                </StackPanel>
                </Grid>
            </Border>
        </Grid>

        <!-- ══════════ ASSOCIATIONS OVERLAY (register with the Windows shell) ══════════ -->
        <!-- Registration and DEFAULTING are two different things and the card has to keep them
             apart. This button writes the ProgID, the Open With hints and the folder verbs;
             only Windows can promote KillerShell to the default, and only when the user says so
             in Settings. See Associations.cs for why forging UserChoice is not on the table. -->
        <Grid x:Name="AssocOverlay" Grid.RowSpan="3" Panel.ZIndex="9000" Visibility="Collapsed"
              Background="#88000000" MouseLeftButtonDown="AssocOverlay_Click">
            <Border Width="460" VerticalAlignment="Center" HorizontalAlignment="Center"
                    Background="{DynamicResource SurfaceBrush}" BorderBrush="{DynamicResource CardBorderBrush}"
                    BorderThickness="1" CornerRadius="8" MouseLeftButtonDown="AssocCard_Click">
                <Border.Effect><DropShadowEffect Color="Black" BlurRadius="30" ShadowDepth="6" Direction="270" Opacity="0.6"/></Border.Effect>
                <Grid>
                <Border IsHitTestVisible="False" CornerRadius="7" Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                <StackPanel Margin="24,20">
                    <Grid Margin="0,0,0,14">
                        <TextBlock Text="{DynamicResource Str_Assoc_Title}" Style="{StaticResource SectionHeader}"
                                   FontSize="13" Margin="0" VerticalAlignment="Center"/>
                        <Button Content="&#xE8BB;" Click="AssocClose_Click" HorizontalAlignment="Right" VerticalAlignment="Top"
                                Width="30" Height="26" FontSize="10" FontFamily="Segoe MDL2 Assets"
                                Style="{StaticResource DangerButton}" BorderThickness="0"/>
                    </Grid>

                    <TextBlock Text="{DynamicResource Str_Assoc_Intro}" Foreground="{DynamicResource MutedTextBrush}"
                               FontSize="11.5" TextWrapping="Wrap" Margin="0,0,0,12"/>

                    <TextBlock Text="{DynamicResource Str_Assoc_What}" Foreground="{DynamicResource DimTextBrush}"
                               FontFamily="Consolas" FontSize="10" Margin="0,0,0,4"/>
                    <TextBlock x:Name="AssocExtList" Foreground="{DynamicResource MutedTextBrush}"
                               FontFamily="Consolas" FontSize="10.5" TextWrapping="Wrap" Margin="0,0,0,12"/>

                    <TextBlock Text="{DynamicResource Str_Assoc_Safe}" Foreground="{DynamicResource DimTextBrush}"
                               FontSize="10.5" TextWrapping="Wrap" Margin="0,0,0,14"/>

                    <CheckBox x:Name="AssocAllUsers" Content="{DynamicResource Str_Assoc_AllUsers}"
                              FontSize="11.5" Margin="0,0,0,14"/>

                    <TextBlock x:Name="AssocStatus" Foreground="{DynamicResource MutedTextBrush}"
                               FontSize="11" TextWrapping="Wrap" Margin="0,0,0,12"/>

                    <Button x:Name="AssocRegisterBtn" Click="AssocRegister_Click"
                            Style="{StaticResource OutlineButton}" Height="30" Margin="0,0,0,8"
                            Content="{DynamicResource Str_Assoc_Register}"/>
                    <Button x:Name="AssocRemoveBtn" Click="AssocRemove_Click"
                            Style="{StaticResource OutlineButton}" Height="30" Margin="0,0,0,8"
                            Content="{DynamicResource Str_Assoc_Remove}"/>
                    <Button x:Name="AssocSettingsBtn" Click="AssocSettings_Click"
                            Style="{StaticResource OutlineButton}" Height="30"
                            Content="{DynamicResource Str_Assoc_OpenSettings}"/>
                </StackPanel>
                </Grid>
            </Border>
        </Grid>

        <!-- ══════════ PATTERN HELP OVERLAY (dim backdrop + centered cheat-sheet card) ══════════ -->
        <Grid x:Name="PatternHelpOverlay" Grid.RowSpan="3" Panel.ZIndex="9000" Visibility="Collapsed"
              Background="#88000000" MouseLeftButtonDown="PatternHelpOverlay_Click">
            <Border Width="440" VerticalAlignment="Center" HorizontalAlignment="Center"
                    Background="{DynamicResource SurfaceBrush}" BorderBrush="{DynamicResource CardBorderBrush}"
                    BorderThickness="1" CornerRadius="8" MouseLeftButtonDown="PatternHelpCard_Click">
                <Border.Effect><DropShadowEffect Color="Black" BlurRadius="30" ShadowDepth="6" Direction="270" Opacity="0.6"/></Border.Effect>
                <Grid>
                <!-- One dark surface with grain across the whole card - no inner box. -->
                <Border IsHitTestVisible="False" CornerRadius="7" Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                <StackPanel Margin="24,20">
                    <Grid Margin="0,0,0,12">
                        <TextBlock Text="{DynamicResource Str_Help_Title}" Style="{StaticResource SectionHeader}" FontSize="13" Margin="0" VerticalAlignment="Center"/>
                        <!-- Foreground lives in a Style setter so the hover/press triggers can win
                             (a local value would beat them - that's why hover never turned red). -->
                        <Button Content="&#xE8BB;" Click="PatternHelpClose_Click" HorizontalAlignment="Right" VerticalAlignment="Top"
                                Width="30" Height="26" FontSize="10" FontFamily="Segoe MDL2 Assets"
                                Background="Transparent" BorderThickness="0" Cursor="Hand">
                            <Button.Style>
                                <Style TargetType="Button">
                                    <Setter Property="Foreground" Value="{DynamicResource ChromeTextBrush}"/>
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="Button">
                                                <Border x:Name="bg" Background="Transparent" CornerRadius="3">
                                                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                                </Border>
                                                <ControlTemplate.Triggers>
                                                    <Trigger Property="IsMouseOver" Value="True">
                                                        <Setter Property="Foreground" Value="{DynamicResource DangerRed}"/>
                                                    </Trigger>
                                                    <Trigger Property="IsPressed" Value="True">
                                                        <Setter Property="Foreground" Value="{DynamicResource DangerRed}"/>
                                                        <Setter TargetName="bg" Property="Background" Value="#33C42B1C"/>
                                                    </Trigger>
                                                </ControlTemplate.Triggers>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </Button.Style>
                        </Button>
                    </Grid>

                    <Grid>
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="118"/>
                                <ColumnDefinition Width="*"/>
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/><RowDefinition Height="Auto"/><RowDefinition Height="Auto"/>
                                <RowDefinition Height="Auto"/><RowDefinition Height="Auto"/><RowDefinition Height="Auto"/>
                                <RowDefinition Height="Auto"/>
                            </Grid.RowDefinitions>
                            <Grid.Resources>
                                <Style x:Key="HelpPat" TargetType="TextBlock">
                                    <Setter Property="FontFamily" Value="Consolas"/>
                                    <Setter Property="FontSize" Value="12"/>
                                    <Setter Property="Foreground" Value="{DynamicResource PrimaryBrush}"/>
                                    <Setter Property="Margin" Value="0,0,10,7"/>
                                    <Setter Property="VerticalAlignment" Value="Top"/>
                                </Style>
                                <Style x:Key="HelpDesc" TargetType="TextBlock">
                                    <Setter Property="FontSize" Value="11"/>
                                    <Setter Property="Foreground" Value="{DynamicResource MutedTextBrush}"/>
                                    <Setter Property="TextWrapping" Value="Wrap"/>
                                    <Setter Property="Margin" Value="0,1,0,7"/>
                                </Style>
                            </Grid.Resources>
                            <TextBlock Grid.Row="0" Grid.Column="0" Style="{StaticResource HelpPat}" Text="*.log"/>
                            <TextBlock Grid.Row="0" Grid.Column="1" Style="{StaticResource HelpDesc}" Text="{DynamicResource Str_Help_Star}"/>
                            <TextBlock Grid.Row="1" Grid.Column="0" Style="{StaticResource HelpPat}" Text="report*"/>
                            <TextBlock Grid.Row="1" Grid.Column="1" Style="{StaticResource HelpDesc}" Text="{DynamicResource Str_Help_Prefix}"/>
                            <TextBlock Grid.Row="2" Grid.Column="0" Style="{StaticResource HelpPat}" Text="*2024*"/>
                            <TextBlock Grid.Row="2" Grid.Column="1" Style="{StaticResource HelpDesc}" Text="{DynamicResource Str_Help_Middle}"/>
                            <TextBlock Grid.Row="3" Grid.Column="0" Style="{StaticResource HelpPat}" Text="log?.txt"/>
                            <TextBlock Grid.Row="3" Grid.Column="1" Style="{StaticResource HelpDesc}" Text="{DynamicResource Str_Help_Q}"/>
                            <TextBlock Grid.Row="4" Grid.Column="0" Style="{StaticResource HelpPat}" Text="*.txt;*.log"/>
                            <TextBlock Grid.Row="4" Grid.Column="1" Style="{StaticResource HelpDesc}" Text="{DynamicResource Str_Help_List}"/>
                            <TextBlock Grid.Row="5" Grid.Column="0" Style="{StaticResource HelpPat}" Text="log"/>
                            <TextBlock Grid.Row="5" Grid.Column="1" Style="{StaticResource HelpDesc}" Text="{DynamicResource Str_Help_Plain}"/>
                            <TextBlock Grid.Row="6" Grid.Column="0" Style="{StaticResource HelpPat}" Text="bin;obj"/>
                            <TextBlock Grid.Row="6" Grid.Column="1" Style="{StaticResource HelpDesc}" Text="{DynamicResource Str_Help_Exclude}"/>
                    </Grid>

                </StackPanel>
                </Grid>
            </Border>
        </Grid>

        <!-- ══════════ SHORTCUTS OVERLAY (F1) - family standard, same chrome as the card above ══════════ -->
        <Grid x:Name="ShortcutsOverlay" Grid.RowSpan="3" Panel.ZIndex="9000" Visibility="Collapsed"
              Background="#88000000" MouseLeftButtonDown="ShortcutsOverlay_Click">
            <!-- Width is set in code (KeyboardMapOverlay.cs ApplyShortcutView): the keyboard
                 view needs a board's worth of room, the list does not. -->
            <Border x:Name="ShortcutCard" Width="460" VerticalAlignment="Center" HorizontalAlignment="Center"
                    Background="{DynamicResource SurfaceBrush}" BorderBrush="{DynamicResource CardBorderBrush}"
                    BorderThickness="1" CornerRadius="8" MouseLeftButtonDown="ShortcutsCard_Click">
                <Border.Effect><DropShadowEffect Color="Black" BlurRadius="30" ShadowDepth="6" Direction="270" Opacity="0.6"/></Border.Effect>
                <Grid>
                <Border IsHitTestVisible="False" CornerRadius="7" Background="{DynamicResource GrainTileBrush}" Opacity="{DynamicResource GrainOpacity}"/>
                <StackPanel Margin="24,20">
                    <Grid Margin="0,0,0,12">
                        <TextBlock Text="{DynamicResource Str_Help_Shortcuts}" Style="{StaticResource SectionHeader}" FontSize="13" Margin="0" VerticalAlignment="Center"/>
                        <!-- Foreground lives in a Style setter so the hover/press triggers can win
                             (a local value would beat them - that's why hover never turned red). -->
                        <Button Content="&#xE8BB;" Click="ShortcutsClose_Click" HorizontalAlignment="Right" VerticalAlignment="Top"
                                Width="30" Height="26" FontSize="10" FontFamily="Segoe MDL2 Assets"
                                Background="Transparent" BorderThickness="0" Cursor="Hand">
                            <Button.Style>
                                <Style TargetType="Button">
                                    <Setter Property="Foreground" Value="{DynamicResource ChromeTextBrush}"/>
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="Button">
                                                <Border x:Name="bg" Background="Transparent" CornerRadius="3">
                                                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                                </Border>
                                                <ControlTemplate.Triggers>
                                                    <Trigger Property="IsMouseOver" Value="True">
                                                        <Setter Property="Foreground" Value="{DynamicResource DangerRed}"/>
                                                    </Trigger>
                                                    <Trigger Property="IsPressed" Value="True">
                                                        <Setter Property="Foreground" Value="{DynamicResource DangerRed}"/>
                                                        <Setter TargetName="bg" Property="Background" Value="#33C42B1C"/>
                                                    </Trigger>
                                                </ControlTemplate.Triggers>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </Button.Style>
                        </Button>
                    </Grid>

                    <!-- LIST / KEYBOARD. Both views are generated from ONE table
                         (ShortcutsOverlay.cs KsRows + KeyboardMapOverlay.cs KbMap), so a new
                         binding shows up in both instead of being hand-copied into the card. -->
                    <StackPanel Orientation="Horizontal" Margin="0,0,0,4">
                        <StackPanel.Resources>
                            <!-- Bare template: a text toggle, no panel chrome. The code-behind
                                 sets Foreground per selection, so nothing here may pin it. -->
                            <Style x:Key="KsViewToggle" TargetType="Button">
                                <Setter Property="FontFamily" Value="Consolas"/>
                                <Setter Property="FontSize" Value="10.5"/>
                                <Setter Property="Background" Value="Transparent"/>
                                <Setter Property="BorderThickness" Value="0"/>
                                <Setter Property="Cursor" Value="Hand"/>
                                <Setter Property="Padding" Value="0"/>
                                <Setter Property="Template">
                                    <Setter.Value>
                                        <ControlTemplate TargetType="Button">
                                            <Border Background="Transparent" Padding="{TemplateBinding Padding}">
                                                <ContentPresenter VerticalAlignment="Center"/>
                                            </Border>
                                        </ControlTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </StackPanel.Resources>
                        <Button x:Name="KsViewListBtn" Content="{DynamicResource Str_Ks_ViewList}"
                                Style="{StaticResource KsViewToggle}" Click="KsViewList_Click"/>
                        <TextBlock Text="/" Foreground="{DynamicResource DimTextBrush}" FontFamily="Consolas"
                                   FontSize="10.5" Margin="7,0" VerticalAlignment="Center"/>
                        <Button x:Name="KsViewKeyboardBtn" Content="{DynamicResource Str_Ks_ViewKeyboard}"
                                Style="{StaticResource KsViewToggle}" Click="KsViewKeyboard_Click"/>
                    </StackPanel>

                    <!-- Scrolls, and its MaxHeight is set in code against the window's own height
                         (ApplyShortcutView). The card is centered with no height of its own, so
                         once the list outgrew the window the overflow was simply clipped and the
                         last group silently lost rows - which is exactly how the VIEW group came
                         to show only its first line.
                         Both hosts filled in code: BuildShortcutsList (ShortcutsOverlay.cs) and
                         BuildKeyboardView (KeyboardMapOverlay.cs), each once and lazily. -->
                    <ScrollViewer x:Name="ShortcutScroll" VerticalScrollBarVisibility="Auto"
                                  HorizontalScrollBarVisibility="Disabled" Focusable="False">
                    <StackPanel>
                        <StackPanel x:Name="ShortcutListHost"/>
                        <StackPanel x:Name="ShortcutKeyboardHost" Visibility="Collapsed"/>
                    </StackPanel>
                    </ScrollViewer>

                    <TextBlock Text="{DynamicResource Str_Ks_Hint}" Foreground="{DynamicResource DimTextBrush}"
                               FontSize="10.5" TextWrapping="Wrap" Margin="0,10,0,0"/>
                </StackPanel>
                </Grid>
            </Border>
        </Grid>

        <!-- Tab drag layer (PaneDrag.cs). Lives at the WINDOW level, not inside a pane,
             because a tab being dragged between panes is over neither of them for most of the
             journey - parented to a pane it would be clipped at that pane's edge.
             Hit-test transparent throughout, or the ghost would sit under the cursor and stop
             the drop from ever finding the pane beneath it. -->
        <Canvas x:Name="DragLayer" Grid.RowSpan="3" Panel.ZIndex="90"
                IsHitTestVisible="False" Visibility="Collapsed">
            <!-- A half-real copy of the tab, carrying the same accent lip and glyph so it is
                 obviously THE tab rather than a generic drag box. -->
            <Border x:Name="TabDragGhost" Opacity="0.72" CornerRadius="6,6,0,0" Padding="12,2,10,5"
                    Background="{DynamicResource PaneBrush}"
                    BorderThickness="0,3,0,0" BorderBrush="{DynamicResource PrimaryBrush}">
                <Border.Effect>
                    <DropShadowEffect Color="Black" BlurRadius="14" ShadowDepth="3"
                                      Direction="270" Opacity="0.5"/>
                </Border.Effect>
                <StackPanel Orientation="Horizontal">
                    <TextBlock x:Name="TabDragGhostGlyph" FontFamily="Segoe MDL2 Assets" FontSize="10"
                               Margin="0,0,5,0" VerticalAlignment="Center"
                               Foreground="{DynamicResource MutedTextBrush}"/>
                    <TextBlock x:Name="TabDragGhostText" FontFamily="Consolas" FontSize="11.5"
                               FontWeight="Bold" VerticalAlignment="Center"
                               Foreground="{DynamicResource TextBrush}"/>
                </StackPanel>
            </Border>

            <!-- Where it would land. Only shown over the target strip, because anywhere else
                 in the pane means "append" and there is no gap to point at. -->
            <Border x:Name="TabDropCaret" Width="2" Visibility="Collapsed"
                    Background="{DynamicResource PrimaryBrush}"/>
        </Canvas>

        <!-- Elevation halo: an accent ring around the whole window when this process is
             running as administrator (Elevation.cs). Drawn as an overlay rather than as a
             border on RootGrid, because a Grid has no border to give it, and hit-test
             transparent so it cannot swallow a click on the chrome underneath.
             Two rings, not a blur: the outer solid one is the signal, the inner translucent
             one softens it into a glow. A DropShadowEffect would be clipped by the window
             edge anyway, and bitmap effects over this window would cost ClearType. -->
        <!-- CornerRadius 8 / 6: Windows 11 rounds every top-level window itself (this one asks
             WindowChrome for CornerRadius 0, so the rounding is the DWM's, not ours). A square
             ring inside a rounded window gets its corners sliced off by that rounding and the
             accent reads as four broken lines instead of one loop. On Windows 10, where the
             window really is square, a rounded ring costs a couple of pixels at each corner -
             the cheaper of the two errors, and the one nobody notices. -->
        <Border x:Name="ElevationHalo" Grid.RowSpan="3" Panel.ZIndex="100" CornerRadius="8"
                Visibility="Collapsed" IsHitTestVisible="False" BorderThickness="2">
            <Border x:Name="ElevationHaloInner" BorderThickness="1" CornerRadius="6" Opacity="0.35"/>
        </Border>

    </Grid>
</Window>