- tweak: UI improvement

Nebula.Launcher/Views/MainWindow.axaml

@@ -1,10 +1,17 @@
 <Window
+    Background="{x:Null}"
+    ExtendClientAreaChromeHints="NoChrome"
+    ExtendClientAreaTitleBarHeightHint="-1"
+    ExtendClientAreaToDecorationsHint="True"
     Height="500"
     Icon="/Assets/avalonia-logo.ico"
     MinHeight="500"
     MinWidth="800"
+    SystemDecorations="BorderOnly"
     Title="Nebula.Launcher"
+    TransparencyLevelHint="AcrylicBlur"
     Width="800"
+    WindowStartupLocation="CenterScreen"
     d:DesignHeight="450"
     d:DesignWidth="800"
     mc:Ignorable="d"
@@ -12,4 +19,54 @@
     xmlns="https://github.com/avaloniaui"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" />
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Grid ColumnDefinitions="*" RowDefinitions="30,*">
+        <Border
+            Background="{StaticResource DefaultGrad}"
+            BorderThickness="0,0,0,2"
+            CornerRadius="0"
+            Grid.Column="0"
+            Grid.Row="0">
+            <Border.BorderBrush>
+                <LinearGradientBrush EndPoint="100%,50%" StartPoint="0%,50%">
+                    <GradientStop Color="#222222" Offset="0.0" />
+                    <GradientStop Color="#442222" Offset="1.0" />
+                </LinearGradientBrush>
+            </Border.BorderBrush>
+            <Panel
+                Background="{StaticResource DefaultGrad}"
+                Height="30"
+                PointerPressed="InputElement_OnPointerPressed">
+                <TextBlock
+                    FontSize="10"
+                    Foreground="White"
+                    IsVisible="False"
+                    Margin="15,0"
+                    Text="Nebula Launcher"
+                    VerticalAlignment="Center" />
+                <StackPanel
+                    HorizontalAlignment="Right"
+                    Margin="5,0,5,0"
+                    Orientation="Horizontal"
+                    Spacing="8">
+                    <Button
+                        Click="Minimize_Click"
+                        Content="🗕"
+                        Foreground="Azure" />
+                    <Button
+                        Click="Maximize_Click"
+                        Content="🗗"
+                        Foreground="Azure" />
+                    <Button
+                        Click="Close_Click"
+                        Content="🗙"
+                        Foreground="Azure" />
+                </StackPanel>
+            </Panel>
+        </Border>
+        <UserControl
+            Grid.Column="0"
+            Grid.Row="1"
+            x:Name="Control" />
+    </Grid>
+</Window>