StarterNG/StarterNG/MainWindow.axaml

<Window
    x:Class="StarterNG.MainWindow"
    x:CompileBindings="True"
    xmlns="https://github.com/avaloniaui"
    xmlns:materialIcons="clr-namespace:Material.Icons.Avalonia;assembly=Material.Icons.Avalonia"
    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:views="clr-namespace:StarterNG.Views"
    xmlns:starterNg="clr-namespace:StarterNG"
    Title="Starter MaSzyna"
    Icon="/Assets/starter.ico"
    Width="1200" Height="768" MinWidth="1200" MinHeight="666"
    WindowStartupLocation="CenterScreen">
    <!-- The client area is extended over the title bar in code-behind (the
         ExtendClientArea* hints), so the logo + nav sit on the top bar while the
         standard minimise / maximise / close buttons stay in the top-right corner.
         Extending the client area also makes Avalonia 12 add an extra full-screen caption
         button; it is hidden in App.axaml via its WindowDecorationProperties.ElementRole. -->

    <DockPanel LastChildFill="True">

        <!-- ── Top bar: thin caption strip (row 0) + toolbar (row 1) ────────────
             The OS minimise / maximise / close buttons render at the top-right of
             the caption strip, so they sit ABOVE the social-icon cluster, which
             lives on the right of the toolbar row. -->
        <Border DockPanel.Dock="Top"
                Background="{StaticResource CarbonPanelBg}"
                BorderBrush="{StaticResource CarbonBorderLight}"
                BorderThickness="0,0,0,1">
            <Grid RowDefinitions="48">

                <!-- Logo + navigation (left) and the right cluster (right) -->
                <!-- Drag-to-move handled by PointerPressed on parent grid -->
                <Grid ColumnDefinitions="Auto,Auto,*,Auto"
                      Background="Transparent"
                      PointerPressed="TitleBar_OnPointerPressed">

                    <!-- Logo -->
                    <Image Grid.Column="0" Source="/Assets/Logo/maszyna_white.png"
                           Height="34" Margin="14,0,18,0" VerticalAlignment="Center" />

                    <!-- Page tabs -->
                    <StackPanel Grid.Column="1" Orientation="Horizontal" VerticalAlignment="Stretch">
                        <RadioButton x:Name="NavScenarios" GroupName="nav" Theme="{StaticResource NavTab}"
                                     Tag="scenarios" IsChecked="True"
                                     IsCheckedChanged="Nav_OnCheckedChanged"
                                     Content="{Binding [NavScenarios], Source={x:Static starterNg:App.Loc}}" />
                        <RadioButton x:Name="NavDepot" GroupName="nav" Theme="{StaticResource NavTab}"
                                     Tag="depot"
                                     IsCheckedChanged="Nav_OnCheckedChanged"
                                     Content="{Binding [NavDepot], Source={x:Static starterNg:App.Loc}}" />
                        <RadioButton x:Name="NavSettings" GroupName="nav" Theme="{StaticResource NavTab}"
                                     Tag="settings"
                                     IsCheckedChanged="Nav_OnCheckedChanged"
                                     Content="{Binding [NavSettings], Source={x:Static starterNg:App.Loc}}" />
                        <Button Classes="Basic" Click="openLastLogClick" Width="48" Cursor="Hand"
                                HorizontalContentAlignment="Center"
                                ToolTip.Tip="{Binding [ShowLatestLogTooltip], Source={x:Static starterNg:App.Loc}}">
                            <materialIcons:MaterialIcon Kind="FileDocument" Height="16" Width="16" />
                        </Button>
                        <Button x:Name="HelpButton" Classes="Basic" Width="48" Cursor="Hand"
                                ToolTip.Tip="{Binding [Help], Source={x:Static starterNg:App.Loc}}"
                                Click="HelpButton_OnClick"
                                Content="?" FontWeight="Bold" FontSize="16"
                                HorizontalContentAlignment="Center" />
                    </StackPanel>

                    <!-- Right cluster: version, language, social links.
                         In the toolbar row, so it sits below the OS caption buttons. -->
                    <StackPanel Grid.Column="3" Orientation="Horizontal" VerticalAlignment="Center"
                                Margin="0,0,8,0" Spacing="4">
                        <StackPanel Orientation="Vertical" VerticalAlignment="Center" Margin="0,0,8,0">
                            <Label Content="{Binding [Version], Source={x:Static starterNg:App.Loc}}"
                                   FontSize="10" Foreground="{StaticResource CarbonFgDim}" Padding="0" />
                            <Label Content="{x:Static starterNg:AppInfo.Version}"
                                   FontSize="10" Foreground="{StaticResource CarbonFg}" Padding="0" />
                        </StackPanel>

                        <ComboBox x:Name="LangCombo" Width="110" VerticalAlignment="Center"
                                  SelectionChanged="LangCombo_OnSelectionChanged" />

                        <Button Classes="Basic" Cursor="Hand" Tag="http://eu07.pl/" Click="linkClick">
                            <materialIcons:MaterialIcon Kind="Web" />
                        </Button>
                        <Button Classes="Basic" Cursor="Hand" Tag="https://discord.gg/eu07" Click="linkClick">
                            <PathIcon Data="{StaticResource DiscordLogo}" Height="12" />
                        </Button>
                        <Button Classes="Basic" Cursor="Hand" Tag="http://www.facebook.com/MaSzynaeu07pl" Click="linkClick">
                            <materialIcons:MaterialIcon Kind="Facebook" />
                        </Button>
                        <Button Classes="Basic" Cursor="Hand" Tag="http://www.youtube.com/@eu07official" Click="linkClick">
                            <materialIcons:MaterialIcon Kind="Youtube" />
                        </Button>
                        <Button Classes="Basic" Cursor="Hand" Tag="http://github.com/MaSzyna-EU07/" Click="linkClick">
                            <materialIcons:MaterialIcon Kind="Github" />
                        </Button>
                    </StackPanel>
                </Grid>
            </Grid>
        </Border>

        <!-- ── Full-width START button (bottom) ─────────────────────────────── -->
        <Button Name="startButton" DockPanel.Dock="Bottom" Classes="Start" Height="44" Margin="6"
                Click="StartButton_OnClick"
                Content="{Binding [Start], Source={x:Static starterNg:App.Loc}}" />

        <!-- ── Page host (one view visible at a time, like the original PageControl) -->
        <Panel Margin="6,6,6,0">
            <views:Scenarios x:Name="ScenariosView" />
            <views:Depot x:Name="DepotView" IsVisible="False" />
            <views:Settings x:Name="SettingsView" IsVisible="False" />
        </Panel>
    </DockPanel>
</Window>