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Billing.Shared/Themes/BaseTheme.cs

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+using Billing.UI;
+using Xamarin.Forms;
+
+namespace Billing.Themes;
+
+public abstract class BaseTheme : ResourceDictionary
+{
+    public const string CascadiaFontRegular = nameof(CascadiaFontRegular);
+    public const string CascadiaFontBold = nameof(CascadiaFontBold);
+    public const string RobotoCondensedFontRegular = nameof(RobotoCondensedFontRegular);
+    public const string RobotoCondensedFontBold = nameof(RobotoCondensedFontBold);
+    public const string WindowBackgroundColor = nameof(WindowBackgroundColor);
+    public const string PromptBackgroundColor = nameof(PromptBackgroundColor);
+    public const string PrimaryColor = nameof(PrimaryColor);
+    public const string SecondaryColor = nameof(SecondaryColor);
+    public const string TabBarBackgroundColor = nameof(TabBarBackgroundColor);
+    public const string TabBarTitleColor = nameof(TabBarTitleColor);
+    public const string TabBarUnselectedColor = nameof(TabBarUnselectedColor);
+    public const string OutRangeDayColor = nameof(OutRangeDayColor);
+    public const string TextColor = nameof(TextColor);
+    public const string WeekendColor = nameof(WeekendColor);
+
+    protected abstract Color PrimaryMauiColor { get; }
+    protected abstract Color SecondaryMauiColor { get; }
+
+    protected void InitResources()
+    {
+        var robotoRegularFontFamily = Definition.GetRobotoCondensedRegularFontFamily();
+        Add(CascadiaFontRegular, Definition.GetCascadiaRegularFontFamily());
+        Add(CascadiaFontBold, Definition.GetCascadiaBoldFontFamily());
+        Add(RobotoCondensedFontRegular, Definition.GetRobotoCondensedRegularFontFamily());
+        Add(RobotoCondensedFontBold, Definition.GetRobotoCondensedBoldFontFamily());
+
+        Add(PrimaryColor, PrimaryMauiColor);
+        Add(SecondaryColor, SecondaryMauiColor);
+        Add(TabBarTitleColor, PrimaryMauiColor);
+
+        Add(new Style(typeof(Label))
+        {
+            Setters =
+            {
+                new Setter { Property = Label.FontSizeProperty, Value = Device.GetNamedSize(NamedSize.Small, typeof(Label)) },
+                new Setter { Property = Label.TextColorProperty, Value = PrimaryMauiColor },
+                new Setter { Property = Label.FontFamilyProperty, Value = robotoRegularFontFamily }
+            }
+        });
+        Add(new Style(typeof(Button))
+        {
+            Setters =
+            {
+                new Setter { Property = Button.TextColorProperty, Value = SecondaryMauiColor },
+                new Setter { Property = Button.FontFamilyProperty, Value = robotoRegularFontFamily },
+                new Setter { Property = VisualElement.BackgroundColorProperty, Value = PrimaryMauiColor },
+                new Setter { Property = Button.PaddingProperty, Value = new Thickness(14, 10) }
+            }
+        });
+        Add(new Style(typeof(TintImage))
+        {
+            Setters =
+            {
+                new Setter { Property = TintImage.PrimaryColorProperty, Value = PrimaryMauiColor }
+            }
+        });
+    }
+}

Billing.Shared/Themes/Dark.cs

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+using Xamarin.Forms;
+
+namespace Billing.Themes;
+
+public class Dark : BaseTheme
+{
+    private static Dark _instance;
+
+    public static Dark Instance => _instance ??= new Dark();
+
+    protected override Color PrimaryMauiColor => Color.White;
+    protected override Color SecondaryMauiColor => Color.LightGray;
+
+    public Dark()
+    {
+        InitColors();
+        InitResources();
+    }
+
+    private void InitColors()
+    {
+        Add(WindowBackgroundColor, Color.Black);
+        Add(PromptBackgroundColor, Color.FromRgb(0x1f, 0x1f, 0x1f));
+        Add(TabBarBackgroundColor, Color.Black);
+        Add(TabBarUnselectedColor, Color.FromRgb(0x82, 0x82, 0x82));
+        Add(OutRangeDayColor, Color.DarkGray);
+        Add(TextColor, Color.FromRgb(0xcc, 0xcc, 0xcc));
+        Add(WeekendColor, Color.FromRgb(211, 5, 5));
+
+        Add(new Style(typeof(TabBar))
+        {
+            Setters =
+            {
+                new Setter { Property = Shell.TabBarBackgroundColorProperty, Value = Color.Black },
+                new Setter { Property = Shell.TabBarTitleColorProperty, Value = PrimaryMauiColor },
+                new Setter { Property = Shell.TabBarUnselectedColorProperty, Value = Color.FromRgb(0x82, 0x82, 0x82) }
+            }
+        });
+    }
+}

Billing.Shared/Themes/Light.cs

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+using Xamarin.Forms;
+
+namespace Billing.Themes;
+
+public class Light : BaseTheme
+{
+    private static Light _instance;
+
+    public static Light Instance => _instance ??= new Light();
+
+    protected override Color PrimaryMauiColor => Color.FromRgb(0x18, 0x31, 0x53);
+    protected override Color SecondaryMauiColor => Color.White;
+
+    public Light()
+    {
+        InitColors();
+        InitResources();
+    }
+
+    private void InitColors()
+    {
+        Add(WindowBackgroundColor, Color.White);
+        Add(PromptBackgroundColor, Color.FromRgb(0xe0, 0xe0, 0xe0));
+        Add(TabBarBackgroundColor, Color.White);
+        Add(TabBarUnselectedColor, Color.FromRgb(0x82, 0x82, 0x82));
+        Add(OutRangeDayColor, Color.LightGray);
+        Add(TextColor, Color.FromRgb(0x33, 0x33, 0x33));
+        Add(WeekendColor, Color.FromRgb(211, 64, 85));
+
+        Add(new Style(typeof(TabBar))
+        {
+            Setters =
+            {
+                new Setter { Property = Shell.TabBarBackgroundColorProperty, Value = Color.White },
+                new Setter { Property = Shell.TabBarTitleColorProperty, Value = PrimaryMauiColor },
+                new Setter { Property = Shell.TabBarUnselectedColorProperty, Value = Color.FromRgb(0x82, 0x82, 0x82) }
+            }
+        });
+    }
+}