FastSeekWpf/MainWindow.xaml

<Window x:Class="FastSeekWpf.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:FastSeekWpf"
        Title="FastSeek"
        Name="FastSeekWnd"
        Width="720"
        MinHeight="80"
        MaxHeight="560"
        WindowStyle="None"
        AllowsTransparency="True"
        Background="Transparent"
        ShowInTaskbar="False"
        Topmost="True"
        ResizeMode="NoResize"
        SizeToContent="Height"
        WindowStartupLocation="Manual"
        Loaded="Window_Loaded"
        Deactivated="Window_Deactivated"
        KeyDown="Window_KeyDown"
        SnapsToDevicePixels="False"
        UseLayoutRounding="True"
        RenderOptions.BitmapScalingMode="HighQuality"
        Opacity="0">

    <Window.Resources>
        <!-- Brushes -->
        <SolidColorBrush x:Key="BgSolid" Color="#0E1018"/>
        <SolidColorBrush x:Key="AccentBrush" Color="#5B8DEF"/>
        <SolidColorBrush x:Key="TextBrush" Color="#E8ECF4"/>
        <SolidColorBrush x:Key="TextDimBrush" Color="#6B7280"/>
        <SolidColorBrush x:Key="BorderBrush" Color="#1E2230"/>
        <SolidColorBrush x:Key="HoverBrush" Color="#1A2035"/>
        <SolidColorBrush x:Key="SelectedBrush" Color="#162238"/>
        <SolidColorBrush x:Key="SearchBg" Color="#161B2A"/>
        <SolidColorBrush x:Key="SearchBorder" Color="#252B3D"/>

        <local:KindToBadgeConverter x:Key="KindToBadge"/>
        <local:PathShortenerConverter x:Key="PathShortener"/>
        <BooleanToVisibilityConverter x:Key="BoolToVis"/>

        <!-- Window appear animation -->
        <Storyboard x:Key="AppearAnim">
            <DoubleAnimation Storyboard.TargetProperty="Opacity"
                             From="0" To="1" Duration="0:0:0.12">
                <DoubleAnimation.EasingFunction>
                    <QuadraticEase EasingMode="EaseOut"/>
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
            <DoubleAnimation Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleX)"
                             From="0.97" To="1" Duration="0:0:0.15">
                <DoubleAnimation.EasingFunction>
                    <QuadraticEase EasingMode="EaseOut"/>
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
            <DoubleAnimation Storyboard.TargetProperty="(UIElement.RenderTransform).(ScaleTransform.ScaleY)"
                             From="0.97" To="1" Duration="0:0:0.15">
                <DoubleAnimation.EasingFunction>
                    <QuadraticEase EasingMode="EaseOut"/>
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
        </Storyboard>

        <Storyboard x:Key="FadeAnim">
            <DoubleAnimation Storyboard.TargetProperty="Opacity"
                             To="0" Duration="0:0:0.08"/>
        </Storyboard>

        <!-- Search box style -->
        <Style x:Key="SearchBoxStyle" TargetType="TextBox">
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="Foreground" Value="{StaticResource TextBrush}"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="FontSize" Value="19"/>
            <Setter Property="FontFamily" Value="Segoe UI Variable Text, Segoe UI, sans-serif"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Padding" Value="44,0,16,0"/>
            <Setter Property="CaretBrush" Value="{StaticResource AccentBrush}"/>
            <Setter Property="SelectionBrush" Value="#3A5A8A"/>
            <Setter Property="SelectionOpacity" Value="0.6"/>
        </Style>

        <!-- Result item container style -->
        <Style x:Key="ResultContainerStyle" TargetType="ListBoxItem">
            <Setter Property="Padding" Value="0"/>
            <Setter Property="Margin" Value="8,1,8,1"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListBoxItem">
                        <Border x:Name="Bd"
                                Background="{TemplateBinding Background}"
                                CornerRadius="8"
                                SnapsToDevicePixels="False">
                            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                              VerticalAlignment="Center"/>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsSelected" Value="True">
                                <Setter TargetName="Bd" Property="Background" Value="{StaticResource SelectedBrush}"/>
                            </Trigger>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter TargetName="Bd" Property="Background" Value="{StaticResource HoverBrush}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <!-- Result item data template -->
        <DataTemplate x:Key="ResultItemTemplate" DataType="local:ResultItem">
            <Border Height="52" Background="Transparent" Cursor="Hand"
                    MouseLeftButtonDown="ResultItem_Click">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="48"/>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="12"/>
                    </Grid.ColumnDefinitions>
                    <!-- Icon background circle -->
                    <Border Grid.Column="0" Width="32" Height="32" CornerRadius="8"
                            Background="{Binding Kind, Converter={StaticResource KindToBadge}}"
                            HorizontalAlignment="Center" VerticalAlignment="Center"
                            Opacity="0.15">
                    </Border>
                    <TextBlock Grid.Column="0" Text="{Binding IconGlyph}" FontFamily="Segoe MDL2 Assets" FontSize="16"
                               Foreground="{Binding Kind, Converter={StaticResource KindToBadge}}"
                               HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    <StackPanel Grid.Column="1" VerticalAlignment="Center" Margin="4,0,0,0">
                        <TextBlock Text="{Binding DisplayName}" FontSize="14" FontWeight="SemiBold"
                                   Foreground="{StaticResource TextBrush}" TextTrimming="CharacterEllipsis"/>
                        <TextBlock Text="{Binding FullPath, Converter={StaticResource PathShortener}}"
                                   FontSize="11" Foreground="{StaticResource TextDimBrush}"
                                   TextTrimming="CharacterEllipsis" Margin="0,2,0,0"/>
                    </StackPanel>
                    <Border Grid.Column="2" CornerRadius="4" Padding="6,2" VerticalAlignment="Center" Margin="8,0,0,0"
                            Background="{Binding Kind, Converter={StaticResource KindToBadge}}" Opacity="0.85">
                        <TextBlock Text="{Binding BadgeLabel}" FontSize="9" FontWeight="Bold"
                                   Foreground="White"/>
                    </Border>
                </Grid>
            </Border>
        </DataTemplate>
    </Window.Resources>

    <Window.RenderTransform>
        <ScaleTransform ScaleX="1" ScaleY="1" CenterX="360" CenterY="0"/>
    </Window.RenderTransform>

    <!-- Outer glow / shadow border -->
    <Border Background="Transparent" CornerRadius="14" Margin="12"
            BorderThickness="1" BorderBrush="{StaticResource BorderBrush}"
            SnapsToDevicePixels="False">
        <Border.Effect>
            <DropShadowEffect BlurRadius="32" ShadowDepth="0" Direction="0" Opacity="0.35" Color="Black"
                              RenderingBias="Quality"/>
        </Border.Effect>

        <!-- Main content with rounded background -->
        <Border Background="{StaticResource BgSolid}" CornerRadius="12"
                BorderThickness="1" BorderBrush="#1A1E2E"
                MouseLeftButtonDown="Window_MouseLeftButtonDown">

            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition Height="*"/>
                    <RowDefinition Height="Auto"/>
                </Grid.RowDefinitions>

                <!-- Search Bar -->
                <Border Grid.Row="0" Margin="16,16,16,8" CornerRadius="10"
                        Background="{StaticResource SearchBg}"
                        BorderThickness="1" BorderBrush="{StaticResource SearchBorder}">
                    <Grid Height="46">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto"/>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>
                        <TextBlock Grid.Column="0" Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="16"
                                   Foreground="{StaticResource TextDimBrush}" Margin="16,0,0,0"
                                   VerticalAlignment="Center"/>
                        <TextBox Grid.Column="1" x:Name="SearchBox" Style="{StaticResource SearchBoxStyle}"
                                 TextChanged="SearchBox_TextChanged" Loaded="SearchBox_Loaded"
                                 VerticalAlignment="Center"/>
                    </Grid>
                </Border>

                <!-- Separator -->
                <Rectangle Grid.Row="1" Height="1" Fill="White" Opacity="0.04" x:Name="SepLine"
                           Margin="16,0,16,0" Visibility="Collapsed"/>

                <!-- Results -->
                <Border Grid.Row="2" Margin="8,4,8,4" CornerRadius="8" Background="Transparent"
                        Visibility="{Binding Results.Count, RelativeSource={RelativeSource AncestorType=Window}, Converter={StaticResource BoolToVis}}">
                    <ScrollViewer x:Name="ResultsScroll" VerticalScrollBarVisibility="Auto"
                                  MaxHeight="380" Style="{x:Null}">
                        <ListBox x:Name="ResultsList"
                                 ItemsSource="{Binding Results, RelativeSource={RelativeSource AncestorType=Window}}"
                                 ItemTemplate="{StaticResource ResultItemTemplate}"
                                 ItemContainerStyle="{StaticResource ResultContainerStyle}"
                                 Background="Transparent"
                                 BorderThickness="0"
                                 Focusable="False"
                                 SelectionChanged="ResultsList_SelectionChanged"
                                 VirtualizingStackPanel.IsVirtualizing="True"
                                 VirtualizingStackPanel.VirtualizationMode="Recycling"
                                 ScrollViewer.CanContentScroll="True">
                            <ListBox.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <VirtualizingStackPanel IsItemsHost="True"/>
                                </ItemsPanelTemplate>
                            </ListBox.ItemsPanel>
                        </ListBox>
                    </ScrollViewer>
                </Border>

                <!-- Empty state hint -->
                <TextBlock Grid.Row="2" x:Name="EmptyHint"
                           Text="Start typing to search your files..."
                           Foreground="{StaticResource TextDimBrush}"
                           FontSize="13"
                           HorizontalAlignment="Center"
                           VerticalAlignment="Center"
                           Margin="0,20,0,20"
                           Visibility="Collapsed"/>

                <!-- Status Bar -->
                <Border Grid.Row="3" x:Name="StatusBar" Height="32"
                        Background="Transparent" Visibility="Collapsed"
                        Margin="16,0,16,8">
                    <Grid>
                        <TextBlock x:Name="StatusText" FontSize="11" Foreground="{StaticResource TextDimBrush}"
                                   VerticalAlignment="Center"/>
                        <TextBlock x:Name="HotkeyHint" FontSize="11" Foreground="{StaticResource TextDimBrush}"
                                   VerticalAlignment="Center" HorizontalAlignment="Right"
                                   Text="Ctrl+Shift+Space to toggle"/>
                    </Grid>
                </Border>
            </Grid>
        </Border>
    </Border>
</Window>