MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    x:Class="UpUpUp.MainPage"
    x:Name="RootPage"
    Title="战斗"
    BackgroundColor="#1a1a1a">

    <Grid>
        <ScrollView>
            <VerticalStackLayout Padding="15" Spacing="10">

                <!-- 关卡显示 -->
                <Label Text="{Binding LevelText}" FontAttributes="Bold" FontSize="22" 
                       HorizontalOptions="Center" TextColor="#FFD700"/>

                <!-- 敌人列表 -->
                <HorizontalStackLayout x:Name="EnemyArea" HorizontalOptions="Center" Spacing="10">
                    <CollectionView ItemsSource="{Binding Enemies}" HeightRequest="110">
                        <CollectionView.ItemsLayout>
                            <LinearItemsLayout Orientation="Horizontal" />
                        </CollectionView.ItemsLayout>
                        <CollectionView.ItemTemplate>
                            <DataTemplate>
                                <Border WidthRequest="110" Padding="5" Margin="3"
                                        StrokeThickness="2" Stroke="#444444" BackgroundColor="#2a2a2a">
                                    <Border.GestureRecognizers>
                                        <DropGestureRecognizer Drop="OnEnemyDrop"/>
                                    </Border.GestureRecognizers>
                                    <Border.StrokeShape><RoundRectangle CornerRadius="6"/></Border.StrokeShape>
                                    <VerticalStackLayout Spacing="1">
                                        <Label Text="{Binding Name}" FontSize="10" HorizontalOptions="Center" TextColor="White"/>
                                        <Label Text="{Binding IntentText}" FontSize="9" HorizontalOptions="Center" TextColor="#FFB74D"/>
                                        <Label FontSize="9" HorizontalOptions="Center" TextColor="#FF6B6B">
                                            <Label.Text><MultiBinding StringFormat="HP:{0}/{1}"><Binding Path="CurrentHP"/><Binding Path="MaxHP"/></MultiBinding></Label.Text>
                                        </Label>
                                        <Button Text="选择" FontSize="8" Padding="2,0"
                                                Command="{Binding BindingContext.SelectEnemyCommand, Source={x:Reference RootPage}}"
                                                CommandParameter="{Binding}" BackgroundColor="#4CAF50"/>
                                    </VerticalStackLayout>
                                </Border>
                            </DataTemplate>
                        </CollectionView.ItemTemplate>
                    </CollectionView>
                </HorizontalStackLayout>

                <!-- 玩家状态 -->
                <StackLayout x:Name="PlayerArea" Orientation="Horizontal" HorizontalOptions="Center">
                    <StackLayout.GestureRecognizers>
                        <DropGestureRecognizer Drop="OnPlayerAreaDrop"/>
                    </StackLayout.GestureRecognizers>
                    <Label Text="HP:" TextColor="White"/>
                    <Label Text="{Binding PlayerHP}" TextColor="#4ECDC4"/>
                    <Label Text="/" TextColor="#888888"/>
                    <Label Text="{Binding PlayerMaxHP}" TextColor="#888888"/>
                    <Label Text=" 护甲:" TextColor="White" Margin="10,0,0,0"/>
                    <Label Text="{Binding PlayerBlock}" TextColor="#FFE66D"/>
                </StackLayout>

                <!-- 手牌 -->
                <CollectionView ItemsSource="{Binding HandCards}" ItemsLayout="HorizontalList" HeightRequest="150">
                    <CollectionView.ItemTemplate>
                        <DataTemplate>
                            <Border WidthRequest="120" Padding="5" Margin="3" BackgroundColor="#2a2a2a">
                                <Border.GestureRecognizers>
                                    <DragGestureRecognizer DragStarting="OnCardDragStarting"/>
                                </Border.GestureRecognizers>
                                <Border.StrokeShape><RoundRectangle CornerRadius="6"/></Border.StrokeShape>
                                <VerticalStackLayout>
                                    <Label Text="{Binding Name}" FontSize="11" TextColor="White"/>
                                    <Label Text="{Binding Description}" FontSize="8" TextColor="#AAA" MaxLines="2"/>
                                    <Button Text="出牌" FontSize="9" Padding="4,1"
                                        Command="{Binding BindingContext.PlayCardCommand, Source={x:Reference RootPage}}"
                                        CommandParameter="{Binding .}" BackgroundColor="#4CAF50"/>
                                </VerticalStackLayout>
                            </Border>
                        </DataTemplate>
                    </CollectionView.ItemTemplate>
                </CollectionView>

                <!-- 提示 -->
                <Label Text="提示: 攻击→敌人, 防御→玩家" FontSize="10" HorizontalOptions="Center" TextColor="#666"/>

                <!-- 牌库 -->
                <HorizontalStackLayout HorizontalOptions="Center" Spacing="20">
                    <Border StrokeThickness="1" Stroke="#444" Padding="8,3" BackgroundColor="#2a2a2a">
                        <VerticalStackLayout>
                            <Label Text="抽牌" FontSize="8" TextColor="#888"/>
                            <Label Text="{Binding DrawPileCount}" FontSize="14" TextColor="#4ECDC4"/>
                        </VerticalStackLayout>
                    </Border>
                    <Button Text="牌库" Command="{Binding ToggleDeckPreviewCommand}" BackgroundColor="#9C27B0" Padding="10,3"/>
                    <Border StrokeThickness="1" Stroke="#444" Padding="8,3" BackgroundColor="#2a2a2a">
                        <VerticalStackLayout>
                            <Label Text="弃牌" FontSize="8" TextColor="#888"/>
                            <Label Text="{Binding DiscardPileCount}" FontSize="14" TextColor="#FF6B6B"/>
                        </VerticalStackLayout>
                    </Border>
                </HorizontalStackLayout>

                <!-- 状态 -->
                <Label Text="{Binding BattleStatusText}" FontSize="12" HorizontalOptions="Center" TextColor="#FFD700"/>
                <Label Text="胜利!" FontSize="28" HorizontalOptions="Center" TextColor="#FFD700" IsVisible="{Binding IsVictory}"/>
                <Label Text="游戏结束" FontSize="28" HorizontalOptions="Center" TextColor="#FF6B6B" IsVisible="{Binding IsGameOver}"/>

                <!-- 按钮 -->
                <Grid ColumnDefinitions="*,*" Margin="0,5,0,0">
                    <Button Text="结束回合" Command="{Binding EndTurnCommand}" BackgroundColor="#4CAF50"/>
                    <Button x:Name="BackButton" Text="返回" Clicked="OnBackClicked" BackgroundColor="#FF6B6B" Grid.Column="1"/>
                </Grid>
            </VerticalStackLayout>
        </ScrollView>

        <!-- 弹窗 -->
        <Border IsVisible="{Binding IsDeckPreviewVisible}" BackgroundColor="#80000000">
            <Border BackgroundColor="#1a1a1a" StrokeThickness="2" Stroke="#444" Padding="15" Margin="20">
                <Border.StrokeShape><RoundRectangle CornerRadius="10"/></Border.StrokeShape>
                <VerticalStackLayout Spacing="10">
                    <Label Text="牌库预览" FontAttributes="Bold" FontSize="18" HorizontalOptions="Center" TextColor="#FFD700"/>
                    <CollectionView ItemsSource="{Binding AllCards}" HeightRequest="200">
                        <CollectionView.ItemsLayout>
                            <LinearItemsLayout Orientation="Horizontal" />
                        </CollectionView.ItemsLayout>
                        <CollectionView.ItemTemplate>
                            <DataTemplate>
                                <Border WidthRequest="90" Padding="4" Margin="2" BackgroundColor="#2a2a2a">
                                    <VerticalStackLayout>
                                        <Label Text="{Binding Name}" FontSize="9" TextColor="White"/>
                                        <Label Text="{Binding Description}" FontSize="7" TextColor="#AAA" MaxLines="2"/>
                                    </VerticalStackLayout>
                                </Border>
                            </DataTemplate>
                        </CollectionView.ItemTemplate>
                    </CollectionView>
                    <Button Text="关闭" Command="{Binding CloseDeckPreviewCommand}" BackgroundColor="#666"/>
                </VerticalStackLayout>
            </Border>
        </Border>
    </Grid>
</ContentPage>