From d3aa3dc6bddb223c37c4f737692359d67fe7f9d9 Mon Sep 17 00:00:00 2001
From: SuperDooper <37051355+superdooper86@users.noreply.github.com>
Date: Fri, 8 May 2026 13:47:44 +0200
Subject: [PATCH] feat: system light/dark theme support with live switching and
 dark title bar

---
 windows/ThemeManager.cs | 79 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 windows/ThemeManager.cs

diff --git a/windows/ThemeManager.cs b/windows/ThemeManager.cs
new file mode 100644
index 0000000..ab1a517
--- /dev/null
+++ b/windows/ThemeManager.cs
@@ -0,0 +1,79 @@
+using Microsoft.Win32;
+using System;
+using System.Windows;
+using System.Windows.Media;
+
+namespace ClaudeCheckerWindows;
+
+public static class ThemeManager
+{
+    public static bool IsDark { get; private set; }
+    public static event Action? ThemeChanged;
+
+    public static void Initialize()
+    {
+        IsDark = ReadIsDark();
+        Apply();
+        SystemEvents.UserPreferenceChanged += OnPreferenceChanged;
+    }
+
+    private static void OnPreferenceChanged(object sender, UserPreferenceChangedEventArgs e)
+    {
+        if (e.Category != UserPreferenceCategory.General) return;
+        var nowDark = ReadIsDark();
+        if (nowDark == IsDark) return;
+        IsDark = nowDark;
+        Application.Current.Dispatcher.Invoke(() =>
+        {
+            Apply();
+            ThemeChanged?.Invoke();
+        });
+    }
+
+    private static bool ReadIsDark()
+    {
+        try
+        {
+            using var key = Registry.CurrentUser.OpenSubKey(
+                @"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize");
+            return (int)(key?.GetValue("AppsUseLightTheme") ?? 1) == 0;
+        }
+        catch { return false; }
+    }
+
+    private static void Apply()
+    {
+        var res = Application.Current.Resources;
+        if (IsDark)
+        {
+            Set(res, "BackgroundBrush",   Color.FromRgb(0x1C, 0x1C, 0x1E));
+            Set(res, "CardBrush",         Color.FromRgb(0x2C, 0x2C, 0x2E));
+            Set(res, "TextBrush",         Color.FromRgb(0xF5, 0xF5, 0xF5));
+            Set(res, "SecondaryBrush",    Color.FromRgb(0x8A, 0x8A, 0x8E));
+            Set(res, "BorderBrush",       Color.FromRgb(0x3A, 0x3A, 0x3C));
+            Set(res, "BlueBrush",         Color.FromRgb(0x3B, 0x82, 0xF6));
+            Set(res, "ButtonBrush",       Color.FromRgb(0x3A, 0x3A, 0x3C));
+            Set(res, "SurfaceBrush",      Color.FromRgb(0x25, 0x25, 0x27));
+            Set(res, "BannerBgBrush",     Color.FromRgb(0x1A, 0x31, 0x52));
+            Set(res, "BannerBorderBrush", Color.FromRgb(0x2A, 0x4A, 0x72));
+        }
+        else
+        {
+            Set(res, "BackgroundBrush",   Color.FromRgb(0xF3, 0xF3, 0xF3));
+            Set(res, "CardBrush",         Colors.White);
+            Set(res, "TextBrush",         Color.FromRgb(0x1C, 0x1C, 0x1C));
+            Set(res, "SecondaryBrush",    Color.FromRgb(0x6E, 0x6E, 0x6E));
+            Set(res, "BorderBrush",       Color.FromRgb(0xE0, 0xE0, 0xE0));
+            Set(res, "BlueBrush",         Color.FromRgb(0x00, 0x78, 0xD4));
+            Set(res, "ButtonBrush",       Colors.White);
+            Set(res, "SurfaceBrush",      Color.FromRgb(0xFA, 0xFA, 0xFA));
+            Set(res, "BannerBgBrush",     Color.FromRgb(0xE8, 0xF2, 0xFB));
+            Set(res, "BannerBorderBrush", Color.FromRgb(0xB3, 0xD6, 0xF5));
+        }
+    }
+
+    private static void Set(ResourceDictionary res, string key, Color color)
+    {
+        if (res[key] is SolidColorBrush b) b.Color = color;
+    }
+}