MainWindow.xaml

<Window x:Class="NetIsolatePlus.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="NetIsolate+"
        WindowStartupLocation="Manual"
        ResizeMode="NoResize"
        WindowStyle="None"
        Background="Transparent"
        AllowsTransparency="True"
        SizeToContent="WidthAndHeight">

    <Border x:Name="RootChrome"
          Background="#0D0D0D"
          BorderBrush="#2A2A2A"
          BorderThickness="1"
          CornerRadius="14"
          SnapsToDevicePixels="True"
          ClipToBounds="True">

        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="44"/>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="auto"/>
            </Grid.RowDefinitions>

            <!-- Title bar -->
            <Border Grid.Row="0"
        CornerRadius="13,13,0,0"
                Background="#111111">
                <Grid x:Name="TitleBarGrid"
        Background="Transparent"
        MouseLeftButtonDown="TitleBar_MouseLeftButtonDown">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition/>
                        <ColumnDefinition Width="32"/>  <!-- minimize -->
                        <ColumnDefinition Width="32"/>  <!-- about -->
                        <ColumnDefinition Width="32"/>  <!-- close -->
                    </Grid.ColumnDefinitions>

                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center" Margin="12,0">
                        <Image x:Name="TitleIcon"
             Source="pack://application:,,,/Assets/NetIsolatePlus.ico"
             Width="30" Height="30" Margin="0,0,8,0"/>
                        <TextBlock Text="NetIsolate+" Foreground="#F0F0F0" FontWeight="Bold" FontSize="20"/>
                    </StackPanel>

                    <Button Grid.Column="1" Click="Minimize_Click" ToolTip="Minimize"
            Background="Transparent" BorderBrush="{x:Null}" Padding="0" Cursor="Hand">
                        <TextBlock Text="—" Foreground="#F0F0F0" FontWeight="Bold" FontSize="16"
                 HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    </Button>

                    <Button Grid.Column="2" Click="About_Click" ToolTip="About"
            Background="Transparent" BorderBrush="{x:Null}" Padding="0" Cursor="Hand">
                        <TextBlock Text="?" Foreground="#F0F0F0" FontWeight="Bold" FontSize="16"
                 HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    </Button>

                    <Button Grid.Column="3" Click="Close_Click" ToolTip="Close"
            Background="Transparent" BorderBrush="{x:Null}" Padding="0" Cursor="Hand">
                        <!-- Close button ONLY: rounded hover in the top-right corner -->
                        <Button.Template>
                            <ControlTemplate TargetType="Button">
                                <Border x:Name="Bd" Background="Transparent" CornerRadius="0,13,0,0">
                                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
                                </Border>
                                <ControlTemplate.Triggers>
                                    <Trigger Property="IsMouseOver" Value="True">
                                        <Setter TargetName="Bd" Property="Background" Value="#E81123"/>
                                    </Trigger>
                                    <Trigger Property="IsPressed" Value="True">
                                        <Setter TargetName="Bd" Property="Background" Value="#C50F1F"/>
                                    </Trigger>
                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Button.Template>

                        <TextBlock Text="×" Foreground="#F0F0F0" FontWeight="Bold" FontSize="18"
                 HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    </Button>
                </Grid>
            </Border>

            <!-- Controls bar -->
            <Grid x:Name="ControlBar" Grid.Row="1" Background="#121212" Height="36">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition/>
                    <ColumnDefinition Width="Auto"/>
                </Grid.ColumnDefinitions>

                <StackPanel Orientation="Horizontal" VerticalAlignment="Center" Margin="12,0,0,0">
                    <!-- Virtual Adapters -->
                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                        <TextBlock Text="Virtual adapters " Foreground="#A9A9A9" VerticalAlignment="Center" FontSize="12"/>
                        <CheckBox x:Name="ToggleVirtual" Style="{StaticResource ToggleSwitchStyle}"
                Checked="ToggleVirtual_Checked" Unchecked="ToggleVirtual_Checked"/>
                    </StackPanel>

                    <!-- Startup -->
                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center" >
                        <TextBlock Text=" Start with Windows " Foreground="#A9A9A9" VerticalAlignment="Center" FontSize="12"/>
                        <CheckBox x:Name="ToggleStartup" Style="{StaticResource ToggleSwitchStyle}"
                Checked="ToggleStartup_Checked" Unchecked="ToggleStartup_Checked"/>
                    </StackPanel>

                    <!-- Sort -->
                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                        <TextBlock Text=" Sort by: " Foreground="#A9A9A9" VerticalAlignment="Center" FontSize="12"/>
                        <ComboBox x:Name="SortCombo"
                                Style="{StaticResource DarkComboBox}"
                                  Width="160"
                                  Background="#141414"
                                  Foreground="White"
                                  BorderBrush="#2A2A2A"
                                  Margin="0,0,10,0"
                                  SelectionChanged="SortCombo_SelectionChanged">

                            <ComboBox.Resources>
                                <SolidColorBrush x:Key="{x:Static SystemColors.WindowBrushKey}"            Color="#141414"/>
                                <SolidColorBrush x:Key="{x:Static SystemColors.ControlTextBrushKey}"       Color="#FFFFFF"/>
                                <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}"         Color="#1F2A30"/>
                                <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}"     Color="#FFFFFF"/>
                                <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}"           Color="#2A2A2A"/>
                                <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkBrushKey}"       Color="#2A2A2A"/>
                            </ComboBox.Resources>

                            <ComboBox.ItemContainerStyle>
                                <Style TargetType="ComboBoxItem">
                                    <Setter Property="Foreground" Value="White"/>
                                    <Setter Property="Background" Value="#141414"/>
                                    <Setter Property="Padding"    Value="8,4"/>
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="ComboBoxItem">
                                                <Border x:Name="Bd" Background="{TemplateBinding Background}">
                                                    <ContentPresenter Margin="{TemplateBinding Padding}"/>
                                                </Border>
                                                <ControlTemplate.Triggers>
                                                    <Trigger Property="IsHighlighted" Value="True">
                                                        <Setter TargetName="Bd" Property="Background" Value="#1E1E1E"/>
                                                    </Trigger>
                                                    <Trigger Property="IsSelected" Value="True">
                                                        <Setter TargetName="Bd" Property="Background" Value="#232323"/>
                                                    </Trigger>
                                                </ControlTemplate.Triggers>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </ComboBox.ItemContainerStyle>

                            <ComboBoxItem Content="Enabled first"  Tag="Enabled"/>
                            <ComboBoxItem Content="Disabled first" Tag="Disabled"/>
                            <ComboBoxItem Content="Name (A→Z)"    Tag="Name"/>
                            <ComboBoxItem Content="Name (Z→A)"    Tag="NameDesc"/>
                        </ComboBox>

                    </StackPanel>
                </StackPanel>

                <!-- Bulk toggle on the right (minimal layout impact) -->
                <StackPanel Grid.Column="1" Orientation="Horizontal" VerticalAlignment="Center" Margin="0,0,10,0">
                    <TextBlock Text="Toggle All:" Foreground="#A9A9A9" VerticalAlignment="Center" FontSize="12" Margin="0,0,6,0"/>
                    <CheckBox x:Name="BulkToggle" Style="{StaticResource ToggleSwitchStyle}"
                              Checked="BulkToggle_Checked" Unchecked="BulkToggle_Checked"/>
                </StackPanel>
            </Grid>

            <!-- Content -->
            <ScrollViewer x:Name="Scroller" Grid.Row="2"
              Margin="10,10,10,10"
              Padding="0"
              VerticalScrollBarVisibility="Auto"
              HorizontalScrollBarVisibility="Disabled">
             <StackPanel x:Name="ListHost"/>
            </ScrollViewer>

            <!-- Busy overlay -->
            <Grid x:Name="BusyOverlay"
      Grid.RowSpan="3"
                Visibility="Collapsed"
      Background="#70000000"
      IsHitTestVisible="False"
                Panel.ZIndex="999">
                <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
                    <Grid Width="56" Height="56" Margin="0,0,0,8" SnapsToDevicePixels="True">
                        <Ellipse Stroke="#33FFFFFF" StrokeThickness="5"/>
                        <Path
                          Stroke="{StaticResource AccentBrush}"
                          StrokeThickness="5"
                          StrokeStartLineCap="Round"
                          StrokeEndLineCap="Round"
                          StrokeDashArray="0.25 1.75"
                          StrokeDashCap="Round"
                          Data="M28,6 A22,22 0 1 1 27.99,6">
                         <Path.Effect>

                                <DropShadowEffect Color="#4CC2FF" BlurRadius="8" ShadowDepth="0" Opacity="0.7"/>
                            </Path.Effect>
                            <Path.RenderTransform>
                                <RotateTransform x:Name="SpinnerRotate" Angle="0" CenterX="28" CenterY="28"/>
                            </Path.RenderTransform>
                        </Path>
                    </Grid>

                    <TextBlock Text="Working..." Foreground="{StaticResource TextBrush}" FontSize="13"
               HorizontalAlignment="Center"/>
                </StackPanel>
            </Grid>
        </Grid>
    </Border>
</Window>