LehrerApp/LehrerApp.Desktop/Views/Groups/LessonDialog.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.LessonDialog"
        x:DataType="vm:LessonDialogViewModel"
        Title="{Binding DialogTitle}"
        Width="1000" Height="760" MinWidth="780" MinHeight="480"
        CanResize="True" WindowStartupLocation="CenterOwner">

  <Grid RowDefinitions="*,Auto" Margin="24">
    <ScrollViewer Grid.Row="0">
      <StackPanel Spacing="14" Margin="0,0,12,0">
        <TextBlock Text="{Binding DialogTitle}" Classes="dialogtitle"/>

        <Grid ColumnDefinitions="*,12,*,12,*,12,*">
          <StackPanel Grid.Column="0" Spacing="4">
            <TextBlock Text="Datum *" FontSize="12" Opacity="0.7"/>
            <TextBox Text="{Binding DateText}" PlaceholderText="TT.MM.JJJJ"/>
            <TextBlock Text="{Binding DateTextError}" Foreground="Red" FontSize="11"
                       IsVisible="{Binding DateTextError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
          </StackPanel>
          <StackPanel Grid.Column="2" Spacing="4">
            <TextBlock Text="Stunde Nr." FontSize="12" Opacity="0.7"/>
            <NumericUpDown Value="{Binding LessonNumber}" Minimum="1" Maximum="20" FormatString="0"
                           ShowButtonSpinner="False"/>
          </StackPanel>
          <StackPanel Grid.Column="4" Spacing="4">
            <TextBlock Text="Beginn" FontSize="12" Opacity="0.7"
                       ToolTip.Tip="Optional. Solange es noch keinen Stundenplan gibt: von Hand eintragen, damit die Uhrzeiten je Phase unten abgeleitet werden können."/>
            <TextBox Text="{Binding StartTimeText}" PlaceholderText="HH:MM"/>
            <TextBlock Text="{Binding StartTimeTextError}" Foreground="Red" FontSize="11"
                       IsVisible="{Binding StartTimeTextError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
          </StackPanel>
          <StackPanel Grid.Column="6" Spacing="4">
            <TextBlock Text="Status" FontSize="12" Opacity="0.7"/>
            <ComboBox ItemsSource="{Binding StatusOptions}" SelectedItem="{Binding StatusName}"
                      HorizontalAlignment="Stretch"/>
          </StackPanel>
        </Grid>

        <StackPanel Spacing="4">
          <TextBlock Text="Thema *" FontSize="12" Opacity="0.7"/>
          <TextBox Text="{Binding Topic}" PlaceholderText="z.B. Brechung an planparallelen Platten"/>
          <TextBlock Text="{Binding TopicError}" Foreground="Red" FontSize="11"
                     IsVisible="{Binding TopicError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
        </StackPanel>

        <Separator Margin="0,4"/>

        <Grid ColumnDefinitions="*,Auto">
          <StackPanel Grid.Column="0" Orientation="Horizontal" Spacing="10" VerticalAlignment="Center">
            <TextBlock Text="Verlaufsplan" FontSize="14" FontWeight="SemiBold"/>
            <TextBlock Text="{Binding TotalDurationDisplay}" FontSize="12" Opacity="0.6"
                       IsVisible="{Binding !HasTimeBudgetInfo}"/>
            <Border Background="{Binding TimeBudgetColorHex}" CornerRadius="10" Padding="9,3"
                    IsVisible="{Binding HasTimeBudgetInfo}"
                    ToolTip.Tip="Geplante Zeit im Vergleich zur laut Stundenraster (Einstellungen) verfügbaren Zeit — bei Doppelstunden werden beide Perioden zusammengezählt.">
              <TextBlock Text="{Binding TimeBudgetLabel}" FontSize="12" FontWeight="SemiBold" Foreground="White"/>
            </Border>
          </StackPanel>
          <Button Grid.Column="1" Content="＋ Phase" Command="{Binding AddPhaseCommand}"/>
        </Grid>

        <!-- Tabellenkopf -->
        <Grid ColumnDefinitions="130,95,120,*,100,95,26,26,26" Margin="4,0,0,0">
          <TextBlock Grid.Column="0" Text="Phase"       FontSize="11" FontWeight="SemiBold" Opacity="0.6"/>
          <TextBlock Grid.Column="1" Text="Pfad"        FontSize="11" FontWeight="SemiBold" Opacity="0.6"
                     ToolTip.Tip="Ankreuzen, wenn diese Phase zu einem alternativen Ablauf gehört (z.B. Kurzversion bei Zeitnot) — öffnet die Zuweisung. Phasen mit demselben Ablauf werden im Verlaufsplan-Viewer gruppiert."/>
          <TextBlock Grid.Column="2" Text="Dauer / Zeit" FontSize="11" FontWeight="SemiBold" Opacity="0.6"/>
          <TextBlock Grid.Column="3" Text="Tätigkeit"   FontSize="11" FontWeight="SemiBold" Opacity="0.6"/>
          <TextBlock Grid.Column="4" Text="Material"    FontSize="11" FontWeight="SemiBold" Opacity="0.6"/>
          <TextBlock Grid.Column="5" Text="Kurzsymbol"  FontSize="11" FontWeight="SemiBold" Opacity="0.6"/>
        </Grid>
        <Separator/>

        <!-- Eine Zeile je Phase, echte Tabellenspalten nebeneinander statt gestapelter Karten. -->
        <ItemsControl ItemsSource="{Binding Phases}">
          <ItemsControl.ItemTemplate>
            <DataTemplate x:DataType="vm:PhaseStepEditItem">
              <Border BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
                      BorderThickness="0,0,0,1" Padding="0,8">
                <Grid ColumnDefinitions="130,95,120,*,100,95,26,26,26">
                  <TextBox Grid.Column="0" Text="{Binding Name}" PlaceholderText="z.B. Erarbeitung"
                           VerticalAlignment="Top" Margin="0,0,6,0"/>
                  <CheckBox Grid.Column="1" IsChecked="{Binding HasAlternativePath}"
                            Content="{Binding AlternativePathName}" Foreground="{Binding AlternativePathColorHex}"
                            FontSize="12" VerticalAlignment="Top" Margin="0,4,6,0"
                            ToolTip.Tip="Teil eines alternativen Ablaufs (z.B. Kurzversion bei Zeitnot). Ankreuzen zum Zuweisen/Anlegen, abwählen zum Entfernen."/>
                  <StackPanel Grid.Column="2" Orientation="Horizontal" Spacing="6"
                              VerticalAlignment="Top" Margin="0,0,6,0">
                    <NumericUpDown Value="{Binding DurationMinutes}" Minimum="0" Maximum="180" Width="62"
                                   FormatString="0" ShowButtonSpinner="False" ToolTip.Tip="Dauer in Minuten"/>
                    <TextBlock Text="{Binding ComputedTimeDisplay}" FontSize="12" Opacity="0.6"
                               VerticalAlignment="Center"/>
                  </StackPanel>
                  <TextBox Grid.Column="3" Text="{Binding Activity}" AcceptsReturn="True" TextWrapping="Wrap"
                           Height="56" VerticalAlignment="Top" Margin="0,0,6,0"
                           PlaceholderText="Lehrer-/Schüler-Tätigkeit"
                           ToolTip.Tip="Bei mehr Text scrollt das Feld intern."/>
                  <AutoCompleteBox Grid.Column="4" Text="{Binding Material}"
                                    ItemsSource="{Binding $parent[ItemsControl].((vm:LessonDialogViewModel)DataContext).MaterialSuggestions}"
                                    FilterMode="Contains" MinimumPrefixLength="0" VerticalAlignment="Top"
                                    Margin="0,0,6,0" PlaceholderText="z.B. AB01"/>
                  <AutoCompleteBox Grid.Column="5" Text="{Binding Shorthand}"
                                    ItemsSource="{Binding $parent[ItemsControl].((vm:LessonDialogViewModel)DataContext).ShorthandSuggestions}"
                                    FilterMode="Contains" MinimumPrefixLength="0" VerticalAlignment="Top"
                                    Margin="0,0,6,0" PlaceholderText="z.B. AB001-&gt;S, Plenum, LDE"
                                    ToolTip.Tip="Freitext für den schnellen Überblick — mal ein Materialfluss-Pfeil (AB001-&gt;S), mal nur eine Sozialform (Plenum, LDE)."/>
                  <Button Grid.Column="6" Content="↑" Command="{Binding MoveUpCommand}" Padding="4,2"
                          VerticalAlignment="Top" ToolTip.Tip="Nach oben"/>
                  <Button Grid.Column="7" Content="↓" Command="{Binding MoveDownCommand}" Padding="4,2"
                          VerticalAlignment="Top" Margin="2,0,0,0" ToolTip.Tip="Nach unten"/>
                  <Button Grid.Column="8" Content="✕" Command="{Binding RemoveCommand}" Padding="4,2"
                          VerticalAlignment="Top" Margin="2,0,0,0" ToolTip.Tip="Entfernen"/>
                </Grid>
              </Border>
            </DataTemplate>
          </ItemsControl.ItemTemplate>
        </ItemsControl>

        <Separator Margin="0,4"/>

        <StackPanel Spacing="4">
          <TextBlock Text="Hausaufgabe" FontSize="12" Opacity="0.7"/>
          <TextBox Text="{Binding Homework}" AcceptsReturn="True" Height="48" TextWrapping="Wrap"/>
        </StackPanel>

        <StackPanel Spacing="4">
          <TextBlock Text="Reflexion" FontSize="12" Opacity="0.7"/>
          <TextBox Text="{Binding Reflection}" AcceptsReturn="True" Height="56" TextWrapping="Wrap"
                    PlaceholderText="Nach der Stunde: was lief gut, was nicht?"/>
        </StackPanel>
      </StackPanel>
    </ScrollViewer>

    <Grid Grid.Row="1" ColumnDefinitions="*,8,*" Margin="0,20,0,0">
      <Button Grid.Column="0" Content="Abbrechen" HorizontalAlignment="Stretch" Click="OnCancel"/>
      <Button Grid.Column="2" Content="{Binding SaveButtonText}"
              HorizontalAlignment="Stretch" Click="OnSave"/>
    </Grid>
  </Grid>
</Window>