diff --git a/web-app/src/containers/ColorPickerAppBgColor.tsx b/web-app/src/containers/ColorPickerAppBgColor.tsx
index 36566d03b..c60b34f13 100644
--- a/web-app/src/containers/ColorPickerAppBgColor.tsx
+++ b/web-app/src/containers/ColorPickerAppBgColor.tsx
@@ -1,4 +1,4 @@
-import { useAppearance, isDefaultColor, useBlurSupport } from '@/hooks/useAppearance'
+import { useAppearance, useBlurSupport } from '@/hooks/useAppearance'
 import { cn } from '@/lib/utils'
 import { RgbaColor, RgbaColorPicker } from 'react-colorful'
 import { IconColorPicker } from '@tabler/icons-react'
@@ -62,6 +62,15 @@ export function ColorPickerAppBgColor() {
     },
   ]
 
+  // Check if a color is the default color (considering both dark and light themes)
+  const isColorDefault = (color: RgbaColor): boolean => {
+    const isDarkDefault = color.r === 25 && color.g === 25 && color.b === 25
+    const isLightDefault = color.r === 255 && color.g === 255 && color.b === 255
+    // Accept both 0.4 and 1 as valid default alpha values (handles blur detection timing)
+    const hasDefaultAlpha = Math.abs(color.a - 0.4) < 0.01 || Math.abs(color.a - 1) < 0.01
+    return (isDarkDefault || isLightDefault) && hasDefaultAlpha
+  }
+
   return (
     <div className="flex items-center gap-1.5">
       {predefineAppBgColor.map((item, i) => {
@@ -69,13 +78,13 @@ export function ColorPickerAppBgColor() {
           (item.r === appBgColor.r &&
             item.g === appBgColor.g &&
             item.b === appBgColor.b &&
-            item.a === appBgColor.a) ||
-          (isDefaultColor(appBgColor) && isDefaultColor(item))
+            Math.abs(item.a - appBgColor.a) < 0.01) ||
+          (isColorDefault(appBgColor) && isColorDefault(item))
         return (
           <div
             key={i}
             className={cn(
-              'size-4 rounded-full border border-main-view-fg/20',
+              'size-4 rounded-full border border-main-view-fg/20 cursor-pointer',
               isSelected && 'ring-2 ring-accent border-none'
             )}
             onClick={() => {
diff --git a/web-app/src/hooks/useAppearance.ts b/web-app/src/hooks/useAppearance.ts
index 874c8ae84..1d422d90f 100644
--- a/web-app/src/hooks/useAppearance.ts
+++ b/web-app/src/hooks/useAppearance.ts
@@ -109,10 +109,14 @@ const isColorEqual = (color1: RgbaColor, color2: RgbaColor): boolean => {
 
 // Helper function to check if color is default (not customized)
 export const isDefaultColor = (color: RgbaColor): boolean => {
-  return (
-    isColorEqual(color, defaultAppBgColor) ||
-    isColorEqual(color, defaultLightAppBgColor)
-  )
+  // Check if RGB matches default (ignore alpha since it changes based on blur support)
+  const isDarkDefault = color.r === 25 && color.g === 25 && color.b === 25
+  const isLightDefault = color.r === 255 && color.g === 255 && color.b === 255
+
+  // Consider it default if RGB matches and alpha is either 0.4 or 1 (common values)
+  const hasDefaultAlpha = Math.abs(color.a - 0.4) < 0.01 || Math.abs(color.a - 1) < 0.01
+
+  return (isDarkDefault || isLightDefault) && hasDefaultAlpha
 }
 
 export const isDefaultColorMainView = (color: RgbaColor): boolean => {
@@ -213,8 +217,11 @@ export const useAppearance = create<AppearanceState>()(
             defaultFontSize
           )
 
-          // Reset app background color
-          const defaultBg = isDark ? defaultAppBgColor : defaultLightAppBgColor
+          // Reset app background color with correct alpha based on blur support
+          const currentAlpha = blurEffectsSupported && IS_TAURI ? 0.4 : 1
+          const defaultBg = isDark
+            ? { r: 25, g: 25, b: 25, a: currentAlpha }
+            : { r: 255, g: 255, b: 255, a: currentAlpha }
           const culoriRgbBg = rgb({
             mode: 'rgb',
             r: defaultBg.r / 255,
@@ -351,12 +358,11 @@ export const useAppearance = create<AppearanceState>()(
           // If color is being set to default, use theme-appropriate default
           let finalColor = color
           if (isDefaultColor(color)) {
-            finalColor = isDark ? defaultAppBgColor : defaultLightAppBgColor
-          }
-
-          // Force alpha to 1 if blur effects are not supported
-          if (!blurEffectsSupported && (IS_WINDOWS || IS_LINUX || !IS_TAURI)) {
-            finalColor = { ...finalColor, a: 1 }
+            // Use current blur support state to determine alpha
+            const currentAlpha = blurEffectsSupported && IS_TAURI ? 0.4 : 1
+            finalColor = isDark
+              ? { r: 25, g: 25, b: 25, a: currentAlpha }
+              : { r: 255, g: 255, b: 255, a: currentAlpha }
           }
 
           // Convert RGBA to a format culori can work with
@@ -629,11 +635,9 @@ export const useAppearance = create<AppearanceState>()(
           // Get the current theme state
           const { isDark } = useTheme.getState()
 
-          // If stored color is default, use theme-appropriate default
-          let finalColor = state.appBgColor
-          if (isDefaultColor(state.appBgColor)) {
-            finalColor = isDark ? defaultAppBgColor : defaultLightAppBgColor
-          }
+          // Just use the stored color as-is during rehydration
+          // The AppearanceProvider will handle alpha normalization after blur detection
+          const finalColor = state.appBgColor
 
           let finalColorMainView = state.appMainViewBgColor
           if (isDefaultColorMainView(state.appMainViewBgColor)) {
diff --git a/web-app/src/providers/AppearanceProvider.tsx b/web-app/src/providers/AppearanceProvider.tsx
index 70c9a881f..290c42231 100644
--- a/web-app/src/providers/AppearanceProvider.tsx
+++ b/web-app/src/providers/AppearanceProvider.tsx
@@ -31,6 +31,28 @@ export function AppearanceProvider() {
   const { isDark } = useTheme()
   const showAlphaSlider = useBlurSupport()
 
+  // Force re-apply appearance on mount to fix theme desync issues on Windows
+  // This ensures that when navigating to routes (like logs), the theme is properly applied
+  useEffect(() => {
+    const {
+      setAppBgColor,
+      setAppMainViewBgColor,
+      appBgColor,
+      appMainViewBgColor,
+    } = useAppearance.getState()
+
+    // Re-trigger setters to ensure CSS variables are applied with correct theme
+    setAppBgColor(appBgColor)
+    setAppMainViewBgColor(appMainViewBgColor)
+  }, []) // Run once on mount
+
+  // Update colors when blur support changes (important for Windows/Linux)
+  useEffect(() => {
+    const { setAppBgColor, appBgColor } = useAppearance.getState()
+    // Re-apply color to update alpha based on blur support
+    setAppBgColor(appBgColor)
+  }, [showAlphaSlider])
+
   // Apply appearance settings on mount and when they change
   useEffect(() => {
     // Apply font size
@@ -197,6 +219,10 @@ export function AppearanceProvider() {
       setAppDestructiveBgColor,
     } = useAppearance.getState()
 
+    // Force re-apply all colors when theme changes to ensure correct dark/light defaults
+    // This is especially important on Windows where the theme might not be properly
+    // synchronized when navigating to different routes (e.g., logs page)
+
     // If using default background color, update it when theme changes
     if (isDefaultColor(appBgColor)) {
       // This will trigger the appropriate updates for both background and text color