CarlMode.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <!-- "Carl Mode (BALD)" theme: intentionally flat, minimal, and a bit snarky. -->

  <!-- Core brushes: flatten gradients, tone down gloss, keep sharp edges -->
  <SolidColorBrush x:Key="WindowBackgroundBrush" Color="#FFE9ECEF"/>
  <SolidColorBrush x:Key="AeroHeaderBrush" Color="#FFF5F7F9"/>
  <SolidColorBrush x:Key="AeroAccentBrush" Color="#FF2C3E50"/>
  <SolidColorBrush x:Key="AeroBorderBrush" Color="#FF9AA3AD"/>
  <!-- Carl keeps the glass panel subtle/optional -->
  <SolidColorBrush x:Key="GlassMenuBackgroundBrush" Color="#D0F5F7F9"/>
  <SolidColorBrush x:Key="GlassStatusBackgroundBrush" Color="#C8F0F3F6"/>
  <SolidColorBrush x:Key="GlassPanelBrush" Color="#10FFFFFF"/>

  <!-- Buttons: flat with subtle hover/press; square corners (bald) -->
  <Style TargetType="Button">
    <Setter Property="Foreground" Value="#FF000000"/>
    <Setter Property="Background" Value="#FFF7F9FB"/>
    <Setter Property="BorderBrush" Value="#FFAFB6BD"/>
    <Setter Property="BorderThickness" Value="1"/>
    <Setter Property="Padding" Value="10,4"/>
    <Setter Property="SnapsToDevicePixels" Value="True"/>
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="Button">
          <Border Background="{TemplateBinding Background}"
                  BorderBrush="{TemplateBinding BorderBrush}"
                  BorderThickness="{TemplateBinding BorderThickness}">
            <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10,3"/>
          </Border>
          <ControlTemplate.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
              <Setter Property="Background" Value="#FFF0F3F6"/>
            </Trigger>
            <Trigger Property="IsPressed" Value="True">
              <Setter Property="Background" Value="#FFE3E8ED"/>
              <Setter Property="BorderBrush" Value="#FF9AA3AD"/>
            </Trigger>
            <Trigger Property="IsEnabled" Value="False">
              <Setter Property="Opacity" Value="0.6"/>
            </Trigger>
          </ControlTemplate.Triggers>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>

  <!-- Tabs: muted, flat background -->
  <Style TargetType="TabControl">
    <Setter Property="BorderBrush" Value="#FF9AA3AD"/>
    <Setter Property="BorderThickness" Value="1"/>
    <Setter Property="Background" Value="#FFFFFFFF"/>
  </Style>
  <Style TargetType="TabItem">
    <Setter Property="Background" Value="#FFF7F9FB"/>
    <Setter Property="BorderBrush" Value="#FFAFB6BD"/>
    <Setter Property="BorderThickness" Value="1"/>
    <Setter Property="Padding" Value="10,6"/>
    <Setter Property="Margin" Value="2,0,2,0"/>
  </Style>

  <!-- Menu: flat hover tint -->
  <Style TargetType="Menu">
    <Setter Property="Background" Value="{StaticResource GlassMenuBackgroundBrush}"/>
    <Setter Property="BorderBrush" Value="#FFAFB6BD"/>
    <Setter Property="BorderThickness" Value="0,0,0,1"/>
  </Style>
  <Style TargetType="MenuItem">
    <Setter Property="Padding" Value="6,3"/>
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="MenuItem">
          <Grid>
            <Border x:Name="Hover" Background="Transparent"/>
            <ContentPresenter Margin="6,2"/>
          </Grid>
          <ControlTemplate.Triggers>
            <Trigger Property="IsHighlighted" Value="True">
              <Setter TargetName="Hover" Property="Background" Value="#1A2C3E50"/>
            </Trigger>
            <Trigger Property="Role" Value="TopLevelHeader">
              <Setter Property="Padding" Value="10,4"/>
            </Trigger>
          </ControlTemplate.Triggers>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>

</ResourceDictionary>