LehrerApp/LehrerApp.Desktop/Views/Groups/ExamEvaluationDialog.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Groups"
        x:Class="LehrerApp.Desktop.Views.Groups.ExamEvaluationDialog"
        x:DataType="vm:ExamEvaluationDialogViewModel"
        Title="{Binding ExamTitle}"
        Width="760" Height="820" MinWidth="600" MinHeight="480"
        CanResize="True" WindowStartupLocation="CenterOwner">

  <Grid RowDefinitions="*,Auto" Margin="24">
    <ScrollViewer Grid.Row="0">
      <StackPanel Spacing="16" Margin="0,0,12,0">

        <StackPanel Spacing="2">
          <StackPanel Orientation="Horizontal" Spacing="8">
            <TextBlock Text="{Binding ExamTitle}" Classes="dialogtitle" VerticalAlignment="Center"/>
            <Border Background="{DynamicResource SystemControlBackgroundAccentBrush}" CornerRadius="4" Padding="8,2"
                    IsVisible="{Binding NiveauLabel, Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
              <TextBlock Text="{Binding NiveauLabel}" FontSize="12" Foreground="White"/>
            </Border>
          </StackPanel>
          <TextBlock Text="{Binding ExamDateLabel}" FontSize="12" Opacity="0.6"/>
        </StackPanel>

        <!-- Kennzahlen -->
        <UniformGrid Columns="3" Rows="2">
          <StackPanel Margin="0,0,12,10">
            <TextBlock Text="DURCHSCHNITT" FontSize="10" FontWeight="Bold" Opacity="0.5"/>
            <TextBlock Text="{Binding AverageDisplay}" FontSize="20" FontWeight="SemiBold"/>
          </StackPanel>
          <StackPanel Margin="0,0,12,10">
            <TextBlock Text="MEDIAN" FontSize="10" FontWeight="Bold" Opacity="0.5"/>
            <TextBlock Text="{Binding MedianDisplay}" FontSize="20" FontWeight="SemiBold"/>
          </StackPanel>
          <StackPanel Margin="0,0,12,10">
            <TextBlock Text="BEWERTET / ABWESEND" FontSize="10" FontWeight="Bold" Opacity="0.5"/>
            <TextBlock FontSize="20" FontWeight="SemiBold">
              <Run Text="{Binding GradedCount}"/>
              <Run Text=" / "/>
              <Run Text="{Binding AbsentCount}"/>
            </TextBlock>
          </StackPanel>
          <StackPanel Margin="0,0,12,0" IsVisible="{Binding BelowThresholdLabel1, Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
            <TextBlock Text="{Binding BelowThresholdLabel1}" FontSize="10" FontWeight="Bold" Opacity="0.5"
                       TextWrapping="Wrap"/>
            <TextBlock Text="{Binding BelowThresholdDisplay1}" FontSize="20" FontWeight="SemiBold"/>
          </StackPanel>
          <StackPanel Margin="0,0,12,0" IsVisible="{Binding BelowThresholdLabel2, Converter={x:Static StringConverters.IsNotNullOrEmpty}}">
            <TextBlock Text="{Binding BelowThresholdLabel2}" FontSize="10" FontWeight="Bold" Opacity="0.5"
                       TextWrapping="Wrap"/>
            <TextBlock Text="{Binding BelowThresholdDisplay2}" FontSize="20" FontWeight="SemiBold"/>
          </StackPanel>
        </UniformGrid>

        <Separator/>

        <!-- Notenspiegel -->
        <TextBlock Text="Notenspiegel" FontSize="14" FontWeight="SemiBold"/>
        <ItemsControl ItemsSource="{Binding GradeDistribution}">
          <ItemsControl.ItemTemplate>
            <DataTemplate x:DataType="vm:GradeBarItem">
              <Grid ColumnDefinitions="40,210,*" Margin="0,3">
                <TextBlock Grid.Column="0" Text="{Binding Grade}" VerticalAlignment="Center" FontWeight="SemiBold"/>
                <Border Grid.Column="1" HorizontalAlignment="Left" Height="16" CornerRadius="3"
                        Width="{Binding BarWidth}"
                        Background="{DynamicResource SystemControlBackgroundAccentBrush}"/>
                <TextBlock Grid.Column="2" Text="{Binding CountDisplay}" FontSize="12" Opacity="0.7"
                           VerticalAlignment="Center" Margin="8,0,0,0"/>
              </Grid>
            </DataTemplate>
          </ItemsControl.ItemTemplate>
        </ItemsControl>
        <TextBlock Text="Noch keine bewerteten Ergebnisse." Classes="emptyhint"
                   IsVisible="{Binding !GradedCount}"/>

        <Separator/>

        <!-- Aufgabenanalyse -->
        <TextBlock Text="Aufgabenanalyse" FontSize="14" FontWeight="SemiBold"/>
        <ItemsControl ItemsSource="{Binding TaskAnalysis}">
          <ItemsControl.Styles>
            <Style Selector="Border.taskbar">
              <Setter Property="Background" Value="{DynamicResource SystemControlBackgroundAccentBrush}"/>
            </Style>
            <Style Selector="Border.taskbar.weak">
              <Setter Property="Background" Value="#E53935"/>
            </Style>
            <Style Selector="TextBlock.tasklabel">
              <Setter Property="Foreground" Value="{DynamicResource SystemControlForegroundBaseHighBrush}"/>
            </Style>
            <Style Selector="TextBlock.tasklabel.weak">
              <Setter Property="Foreground" Value="#E53935"/>
              <Setter Property="FontWeight" Value="SemiBold"/>
            </Style>
          </ItemsControl.Styles>
          <ItemsControl.ItemTemplate>
            <DataTemplate x:DataType="vm:TaskAnalysisItem">
              <Grid ColumnDefinitions="180,210,*" Margin="0,3">
                <TextBlock Grid.Column="0" Classes="tasklabel" Classes.weak="{Binding IsWeak}"
                           Text="{Binding Label}" VerticalAlignment="Center" TextTrimming="CharacterEllipsis"/>
                <Border Grid.Column="1" Classes="taskbar" Classes.weak="{Binding IsWeak}"
                        HorizontalAlignment="Left" Height="16" CornerRadius="3" Width="{Binding BarWidth}"/>
                <TextBlock Grid.Column="2" Text="{Binding AvgPercentDisplay}" FontSize="12" Opacity="0.7"
                           VerticalAlignment="Center" Margin="8,0,0,0"/>
              </Grid>
            </DataTemplate>
          </ItemsControl.ItemTemplate>
        </ItemsControl>
        <TextBlock Text="Auffällig schwache Aufgaben (Ø unter 50 %) sind rot markiert." Opacity="0.4" FontSize="11"
                   IsVisible="{Binding TaskAnalysis.Count}"/>

        <Separator/>

        <!-- Notenschlüssel verschieben -->
        <Grid ColumnDefinitions="*,Auto">
          <TextBlock Grid.Column="0" Text="Notenschlüssel verschieben" FontSize="14" FontWeight="SemiBold" VerticalAlignment="Center"/>
          <Button Grid.Column="1" Content="＋ Stufe" Command="{Binding AddGradingKeyRowCommand}"/>
        </Grid>
        <TextBlock Text="Änderungen wirken sich sofort auf den Notenspiegel oben aus. Erst mit &quot;Übernehmen&quot; werden sie an der Klausur gespeichert."
                   FontSize="11" Opacity="0.5" TextWrapping="Wrap"/>

        <ItemsControl ItemsSource="{Binding GradingKeyEntries}">
          <ItemsControl.ItemTemplate>
            <DataTemplate x:DataType="vm:GradingKeyEntryEditItem">
              <Grid ColumnDefinitions="90,90,*,Auto" Margin="0,0,0,4">
                <TextBox Grid.Column="0" Text="{Binding Grade}" PlaceholderText="Note" Margin="0,0,6,0"/>
                <NumericUpDown Grid.Column="1" Value="{Binding MinPercent}" Minimum="0" Maximum="100"
                               FormatString="0.##" Width="90" ShowButtonSpinner="False" Margin="0,0,6,0"/>
                <TextBlock Grid.Column="2" Text="{Binding AbsolutePointsDisplay}" FontSize="12" Opacity="0.65"
                           VerticalAlignment="Center"/>
                <Button Grid.Column="3" Content="✕" Command="{Binding RemoveCommand}" Padding="6,2"/>
              </Grid>
            </DataTemplate>
          </ItemsControl.ItemTemplate>
        </ItemsControl>

        <TextBlock Text="{Binding GradingKeyValidation}" Foreground="Red" FontSize="12"
                   IsVisible="{Binding GradingKeyValidation, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>

        <Grid ColumnDefinitions="*,Auto">
          <TextBlock Grid.Column="0" Text="{Binding GradingKeyStatus}" Foreground="Green" FontSize="12"
                     VerticalAlignment="Center"
                     IsVisible="{Binding GradingKeyStatus, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
          <Button Grid.Column="1" Content="Übernehmen" Command="{Binding ApplyGradingKeyCommand}"/>
        </Grid>

      </StackPanel>
    </ScrollViewer>

    <Grid Grid.Row="1" ColumnDefinitions="Auto,*,Auto" Margin="0,16,0,0">
      <Button Grid.Column="0" Content="Als CSV exportieren" Click="OnExportClick"/>
      <Button Grid.Column="2" Content="Fertig" Click="OnClose"/>
    </Grid>
  </Grid>
</Window>