App.xaml

<Application x:Class="DenseNumerics.App"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>

                <ResourceDictionary Source="/Themes/LightTheme.xaml"/>
                <ResourceDictionary>
                    <!-- Material Button Style -->
                    <Style x:Key="MaterialButton" TargetType="Button">
                        <Setter Property="Background" Value="{StaticResource PrimaryBrush}"/>
                        <Setter Property="Foreground" Value="White"/>
                        <Setter Property="Padding" Value="16,8"/>
                        <Setter Property="BorderThickness" Value="0"/>
                        <Setter Property="Template">
                            <Setter.Value>
                                <ControlTemplate TargetType="Button">
                                    <Border x:Name="border" 
                                           Background="{TemplateBinding Background}"
                                           BorderBrush="{TemplateBinding BorderBrush}"
                                           BorderThickness="{TemplateBinding BorderThickness}"
                                           CornerRadius="4">
                                        <ContentPresenter x:Name="contentPresenter"
                                                       HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                                       VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                                       Margin="{TemplateBinding Padding}"/>
                                    </Border>
                                    <ControlTemplate.Triggers>
                                        <Trigger Property="IsMouseOver" Value="True">
                                            <Setter TargetName="border" Property="Background" Value="{StaticResource PrimaryDarkBrush}"/>
                                        </Trigger>
                                        <Trigger Property="IsPressed" Value="True">
                                            <Setter TargetName="border" Property="Background" Value="{StaticResource PrimaryLightBrush}"/>
                                        </Trigger>
                                        <Trigger Property="IsEnabled" Value="False">
                                            <Setter Property="Opacity" Value="0.5"/>
                                        </Trigger>
                                    </ControlTemplate.Triggers>
                                </ControlTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>

                    <!-- Material ComboBox Style -->
                    <Style x:Key="MaterialComboBox" TargetType="ComboBox">
                        <Setter Property="Background" Value="Transparent"/>
                        <Setter Property="BorderThickness" Value="0,0,0,1"/>
                        <Setter Property="BorderBrush" Value="{StaticResource TextSecondaryBrush}"/>
                        <Setter Property="Padding" Value="8,4"/>
                    </Style>

                    <!-- Material ToggleButton Style -->
                    <Style x:Key="MaterialToggleButton" TargetType="ToggleButton">
                        <Setter Property="Background" Value="Transparent"/>
                        <Setter Property="BorderThickness" Value="0"/>
                        <Setter Property="Padding" Value="8"/>
                    </Style>
                </ResourceDictionary>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>