更新

PetWashControl/Views/AdminLoginWindow.xaml

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+<Window x:Class="PetWashControl.Views.AdminLoginWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="管理员验证"
+        Width="420"
+        Height="340"
+        WindowStartupLocation="CenterOwner"
+        ResizeMode="NoResize"
+        Background="#F5F7FA">
+    <Grid Margin="28">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+
+        <TextBlock Text="系统设置"
+                   FontSize="30"
+                   FontWeight="Bold"
+                   Foreground="#1F2937"/>
+
+        <TextBlock Grid.Row="1"
+                   Margin="0,8,0,0"
+                   Text="请输入管理员账号和密码"
+                   FontSize="15"
+                   Foreground="#6B7280"/>
+
+        <StackPanel Grid.Row="2"
+                    Margin="0,28,0,0">
+            <TextBlock Text="管理员账号"
+                       FontSize="14"
+                       Foreground="#374151"/>
+            <TextBox x:Name="UsernameTextBox"
+                     Margin="0,8,0,0"
+                     Height="42"
+                     Padding="10"
+                     FontSize="16"/>
+        </StackPanel>
+
+        <StackPanel Grid.Row="3"
+                    Margin="0,18,0,0">
+            <TextBlock Text="管理员密码"
+                       FontSize="14"
+                       Foreground="#374151"/>
+            <PasswordBox x:Name="PasswordInput"
+                         Margin="0,8,0,0"
+                         Height="42"
+                         Padding="10"
+                         FontSize="16"
+                         KeyDown="PasswordInput_KeyDown"/>
+        </StackPanel>
+
+        <Border Grid.Row="4"
+                x:Name="ErrorContainer"
+                Margin="0,18,0,0"
+                Background="#FEF2F2"
+                CornerRadius="12"
+                Padding="12"
+                Visibility="Collapsed">
+            <TextBlock x:Name="ErrorTextBlock"
+                       Text="账号或密码错误"
+                       Foreground="#B91C1C"
+                       FontSize="14"/>
+        </Border>
+
+        <Grid Grid.Row="5"
+              Margin="0,24,0,0">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="120"/>
+                <ColumnDefinition Width="12"/>
+                <ColumnDefinition Width="120"/>
+            </Grid.ColumnDefinitions>
+
+            <Button Grid.Column="1"
+                    Content="取消"
+                    Height="44"
+                    Background="#CBD5E1"
+                    Foreground="#0F172A"
+                    BorderThickness="0"
+                    IsCancel="True"
+                    Click="CancelButton_Click"/>
+
+            <Button Grid.Column="3"
+                    Content="确定"
+                    Height="44"
+                    Background="#1976D2"
+                    Foreground="White"
+                    BorderThickness="0"
+                    IsDefault="True"
+                    Click="LoginButton_Click"/>
+        </Grid>
+    </Grid>
+</Window>