LehrerApp/LehrerApp.Desktop/Views/Students/StudentDetailView.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Students"
             x:Class="LehrerApp.Desktop.Views.Students.StudentDetailView"
             x:DataType="vm:StudentDetailViewModel">

  <Grid RowDefinitions="Auto,Auto,*">

    <!-- ── Header ──────────────────────────────────────────────────────── -->
    <Border Grid.Row="0" Padding="20,16"
            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
            BorderThickness="0,0,0,1">
      <Grid ColumnDefinitions="*,Auto">

        <!-- Anzeigemodus -->
        <StackPanel Grid.Column="0"
                    IsVisible="{Binding !IsEditing}">
          <TextBlock Text="{Binding StudentTitle}"
                     FontSize="22" FontWeight="SemiBold"/>
          <TextBlock Text="{Binding Student.DateOfBirth,
                       StringFormat='Geb. {0:dd.MM.yyyy}',
                       FallbackValue=''}"
                     FontSize="12" Opacity="0.5"/>
        </StackPanel>

        <!-- Bearbeitungsmodus -->
        <StackPanel Grid.Column="0" Spacing="6"
                    IsVisible="{Binding IsEditing}">
          <Grid ColumnDefinitions="*,8,*">
            <TextBox Grid.Column="0"
                     Text="{Binding EditFirstName}"
                     Watermark="Vorname"/>
            <TextBox Grid.Column="2"
                     Text="{Binding EditLastName}"
                     Watermark="Nachname"/>
          </Grid>
          <TextBox Text="{Binding EditNotes}"
                   Watermark="Interne Notiz (optional)"
                   AcceptsReturn="True" MaxHeight="80"/>
        </StackPanel>

        <!-- Aktions-Buttons -->
        <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8"
                    VerticalAlignment="Top">
          <Button Content="Bearbeiten"
                  Command="{Binding StartEditCommand}"
                  IsVisible="{Binding !IsEditing}"/>
          <Button Content="Speichern"
                  Command="{Binding SaveEditCommand}"
                  IsVisible="{Binding IsEditing}"/>
          <Button Content="Abbrechen"
                  Command="{Binding CancelEditCommand}"
                  IsVisible="{Binding IsEditing}"/>
        </StackPanel>
      </Grid>
    </Border>

    <!-- ── Tab-Leiste ──────────────────────────────────────────────────── -->
    <Border Grid.Row="1"
            BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
            BorderThickness="0,0,0,1" Padding="16,0">
      <StackPanel Orientation="Horizontal" Spacing="4">
        <Button Content="Übersicht"
                Command="{Binding SwitchTabCommand}"
                CommandParameter="{x:Static vm:StudentTab.Overview}"
                Background="Transparent" Padding="12,8"/>
        <Button Content="Noten"
                Command="{Binding SwitchTabCommand}"
                CommandParameter="{x:Static vm:StudentTab.Grades}"
                Background="Transparent" Padding="12,8"/>
        <Button Content="Dokumentation"
                Command="{Binding SwitchTabCommand}"
                CommandParameter="{x:Static vm:StudentTab.Documentation}"
                Background="Transparent" Padding="12,8"/>
      </StackPanel>
    </Border>

    <!-- ── Tab-Inhalt ──────────────────────────────────────────────────── -->
    <ScrollViewer Grid.Row="2" Padding="20">

      <!-- Übersicht: Lerngruppen-Verlauf -->
      <StackPanel IsVisible="{Binding ActiveTab,
                    Converter={x:Static ObjectConverters.Equal},
                    ConverterParameter={x:Static vm:StudentTab.Overview}}"
                  Spacing="16">

        <TextBlock Text="Lerngruppen" FontSize="15" FontWeight="SemiBold"/>
        <ItemsControl ItemsSource="{Binding Enrollments}">
          <ItemsControl.ItemTemplate>
            <DataTemplate DataType="vm:EnrollmentEntry">
              <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
                      CornerRadius="6" Padding="12,8" Margin="0,0,0,6">
                <Grid ColumnDefinitions="Auto,*,Auto">
                  <TextBlock Grid.Column="0"
                             Text="{Binding SchoolYear}"
                             FontWeight="SemiBold" Width="70"/>
                  <TextBlock Grid.Column="1"
                             Text="{Binding GroupName}"
                             Margin="8,0"/>
                  <TextBlock Grid.Column="2"
                             Text="{Binding Subject}"
                             Opacity="0.5" FontSize="12"/>
                </Grid>
              </Border>
            </DataTemplate>
          </ItemsControl.ItemTemplate>
        </ItemsControl>

        <TextBlock Text="{Binding Student.Notes}"
                   IsVisible="{Binding Student.Notes,
                     Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
                   Opacity="0.7" FontSize="13"
                   TextWrapping="Wrap"/>
      </StackPanel>

      <!-- Dokumentation -->
      <ItemsControl IsVisible="{Binding ActiveTab,
                      Converter={x:Static ObjectConverters.Equal},
                      ConverterParameter={x:Static vm:StudentTab.Documentation}}"
                    ItemsSource="{Binding Documentation}">
        <ItemsControl.ItemTemplate>
          <DataTemplate DataType="vm:DocEntry">
            <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}"
                    CornerRadius="6" Padding="12,10" Margin="0,0,0,8">
              <Grid ColumnDefinitions="Auto,*,Auto">
                <TextBlock Grid.Column="0"
                           Text="{Binding Date}"
                           Opacity="0.5" FontSize="12" Width="80"/>
                <StackPanel Grid.Column="1" Margin="8,0">
                  <TextBlock Text="{Binding Title}"
                             FontWeight="SemiBold" FontSize="13"/>
                  <TextBlock Text="{Binding TypeLabel}"
                             FontSize="11" Opacity="0.5"/>
                </StackPanel>
                <TextBlock Grid.Column="2"
                           Text="🔒" FontSize="14"
                           IsVisible="{Binding IsConfidential}"
                           ToolTip.Tip="Vertraulich"/>
              </Grid>
            </Border>
          </DataTemplate>
        </ItemsControl.ItemTemplate>
      </ItemsControl>

    </ScrollViewer>
  </Grid>

</UserControl>