diff --git a/src-tauri/capabilities/desktop.json b/src-tauri/capabilities/desktop.json
index 41be646d3..2182b9c03 100644
--- a/src-tauri/capabilities/desktop.json
+++ b/src-tauri/capabilities/desktop.json
@@ -12,6 +12,8 @@
     "core:webview:allow-set-webview-zoom",
     "core:window:allow-start-dragging",
     "core:window:allow-set-theme",
+    "core:window:allow-get-all-windows",
+    "core:event:allow-listen",
     "shell:allow-spawn",
     "shell:allow-open",
     "core:app:allow-set-app-theme",
diff --git a/src-tauri/capabilities/log-app-window.json b/src-tauri/capabilities/log-app-window.json
index 9f95d1bb9..1bc329ab4 100644
--- a/src-tauri/capabilities/log-app-window.json
+++ b/src-tauri/capabilities/log-app-window.json
@@ -1,14 +1,18 @@
 {
   "$schema": "../gen/schemas/desktop-schema.json",
-  "identifier": "logs-app-window",
+  "identifier": "log-app-window",
   "description": "enables permissions for the logs app window",
   "windows": ["logs-app-window"],
+  "platforms": ["linux", "macOS", "windows"],
   "permissions": [
     "core:default",
     "core:window:allow-start-dragging",
     "core:window:allow-set-theme",
+    "core:window:allow-get-all-windows",
+    "core:event:allow-listen",
     "log:default",
     "core:webview:allow-create-webview-window",
+    "core:webview:allow-get-all-webviews",
     "core:window:allow-set-focus"
   ]
 }
diff --git a/src-tauri/capabilities/logs-window.json b/src-tauri/capabilities/logs-window.json
index ef56e6f75..1a166f503 100644
--- a/src-tauri/capabilities/logs-window.json
+++ b/src-tauri/capabilities/logs-window.json
@@ -3,12 +3,16 @@
   "identifier": "logs-window",
   "description": "enables permissions for the logs window",
   "windows": ["logs-window-local-api-server"],
+  "platforms": ["linux", "macOS", "windows"],
   "permissions": [
     "core:default",
     "core:window:allow-start-dragging",
     "core:window:allow-set-theme",
+    "core:window:allow-get-all-windows",
+    "core:event:allow-listen",
     "log:default",
     "core:webview:allow-create-webview-window",
+    "core:webview:allow-get-all-webviews",
     "core:window:allow-set-focus"
   ]
 }
diff --git a/src-tauri/capabilities/system-monitor-window.json b/src-tauri/capabilities/system-monitor-window.json
index 68a75e9fb..cec43f8d8 100644
--- a/src-tauri/capabilities/system-monitor-window.json
+++ b/src-tauri/capabilities/system-monitor-window.json
@@ -8,13 +8,28 @@
     "core:default",
     "core:window:allow-start-dragging",
     "core:window:allow-set-theme",
+    "core:window:allow-get-all-windows",
+    "core:event:allow-listen",
     "log:default",
     "core:webview:allow-create-webview-window",
+    "core:webview:allow-get-all-webviews",
     "core:window:allow-set-focus",
     "hardware:allow-get-system-info",
     "hardware:allow-get-system-usage",
     "llamacpp:allow-get-devices",
     "llamacpp:allow-read-gguf-metadata",
-    "deep-link:allow-get-current"
+    "deep-link:allow-get-current",
+    {
+      "identifier": "http:default",
+      "allow": [
+        {
+          "url": "https://*:*"
+        },
+        {
+          "url": "http://*:*"
+        }
+      ],
+      "deny": []
+    }
   ]
 }
diff --git a/src-tauri/src/core/setup.rs b/src-tauri/src/core/setup.rs
index 6564d3609..7ba8f2f74 100644
--- a/src-tauri/src/core/setup.rs
+++ b/src-tauri/src/core/setup.rs
@@ -7,7 +7,7 @@ use std::{
 };
 use tar::Archive;
 use tauri::{
-    App, Emitter, Manager, Runtime, Wry
+    App, Emitter, Manager, Runtime, Wry, WindowEvent
 };
 
 #[cfg(desktop)]
@@ -270,3 +270,32 @@ pub fn setup_tray(app: &App) -> tauri::Result<TrayIcon> {
         })
         .build(app)
 }
+
+pub fn setup_theme_listener<R: Runtime>(app: &App<R>) -> tauri::Result<()> {
+    // Setup theme listener for main window
+    if let Some(window) = app.get_webview_window("main") {
+        setup_window_theme_listener(app.handle().clone(), window);
+    }
+
+    Ok(())
+}
+
+fn setup_window_theme_listener<R: Runtime>(
+    app_handle: tauri::AppHandle<R>,
+    window: tauri::WebviewWindow<R>,
+) {
+    let window_label = window.label().to_string();
+    let app_handle_clone = app_handle.clone();
+
+    window.on_window_event(move |event| {
+        if let WindowEvent::ThemeChanged(theme) = event {
+            let theme_str = match theme {
+                tauri::Theme::Light => "light",
+                tauri::Theme::Dark => "dark",
+                _ => "auto",
+            };
+            log::info!("System theme changed to: {} for window: {}", theme_str, window_label);
+            let _ = app_handle_clone.emit("theme-changed", theme_str);
+        }
+    });
+}
diff --git a/src-tauri/src/core/system/commands.rs b/src-tauri/src/core/system/commands.rs
index 938e6f8bf..9c72fd4da 100644
--- a/src-tauri/src/core/system/commands.rs
+++ b/src-tauri/src/core/system/commands.rs
@@ -117,3 +117,4 @@ pub fn is_library_available(library: &str) -> bool {
         }
     }
 }
+
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 628f22b08..8ca44d9a9 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -193,6 +193,7 @@ pub fn run() {
             }
 
             setup_mcp(app);
+            setup::setup_theme_listener(app)?;
             Ok(())
         })
         .build(tauri::generate_context!())
diff --git a/src-tauri/tauri.conf.json b/src-tauri/tauri.conf.json
index b0df3fc2f..fb1b1950b 100644
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -40,7 +40,7 @@
       }
     ],
     "security": {
-      "capabilities": ["default"],
+      "capabilities": ["default", "logs-app-window", "logs-window", "system-monitor-window"],
       "csp": {
         "default-src": "'self' customprotocol: asset: http://localhost:* http://127.0.0.1:* ws://localhost:* ws://127.0.0.1:*",
         "connect-src": "ipc: http://ipc.localhost http://127.0.0.1:* ws://localhost:* ws://127.0.0.1:* https: http:",
diff --git a/src-tauri/tauri.linux.conf.json b/src-tauri/tauri.linux.conf.json
index 02fa8cdf6..32f6068a2 100644
--- a/src-tauri/tauri.linux.conf.json
+++ b/src-tauri/tauri.linux.conf.json
@@ -1,7 +1,12 @@
 {
   "app": {
     "security": {
-      "capabilities": ["desktop", "system-monitor-window"]
+      "capabilities": [
+        "desktop",
+        "system-monitor-window",
+        "log-app-window",
+        "logs-window"
+      ]
     }
   },
   "bundle": {
diff --git a/src-tauri/tauri.macos.conf.json b/src-tauri/tauri.macos.conf.json
index 92f937f0f..5c5b493fa 100644
--- a/src-tauri/tauri.macos.conf.json
+++ b/src-tauri/tauri.macos.conf.json
@@ -1,7 +1,12 @@
 {
   "app": {
     "security": {
-      "capabilities": ["desktop", "system-monitor-window"]
+      "capabilities": [
+        "desktop",
+        "system-monitor-window",
+        "log-app-window",
+        "logs-window"
+      ]
     }
   },
   "bundle": {
diff --git a/src-tauri/tauri.windows.conf.json b/src-tauri/tauri.windows.conf.json
index 91e2eb374..5efc39c75 100644
--- a/src-tauri/tauri.windows.conf.json
+++ b/src-tauri/tauri.windows.conf.json
@@ -1,7 +1,12 @@
 {
   "app": {
     "security": {
-      "capabilities": ["desktop"]
+      "capabilities": [
+        "desktop",
+        "system-monitor-window",
+        "log-app-window",
+        "logs-window"
+      ]
     }
   },
 
diff --git a/web-app/index.html b/web-app/index.html
index dd2e76ee6..55625d33c 100644
--- a/web-app/index.html
+++ b/web-app/index.html
@@ -17,7 +17,7 @@
     <link rel="apple-touch-icon" href="/images/jan-logo.png" />
     <meta
       name="viewport"
-      content="width=device-width, initial-scale=1.0, user-scalable=no, maximum-scale=1.0, minimum-scale=1.0, viewport-fit=cover, interactive-widget=resizes-visual"
+      content="width=device-width, initial-scale=1.0, user-scalable=no, maximum-scale=1.0, minimum-scale=1.0, viewport-fit=cover"
     />
     <title>Jan</title>
     <!-- INJECT_GOOGLE_ANALYTICS -->
diff --git a/web-app/src/containers/ColorPickerAppBgColor.tsx b/web-app/src/containers/ColorPickerAppBgColor.tsx
index 72e098aa4..c60b34f13 100644
--- a/web-app/src/containers/ColorPickerAppBgColor.tsx
+++ b/web-app/src/containers/ColorPickerAppBgColor.tsx
@@ -1,4 +1,4 @@
-import { useAppearance, isDefaultColor } 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'
@@ -14,6 +14,12 @@ export function ColorPickerAppBgColor() {
   const { appBgColor, setAppBgColor } = useAppearance()
   const { isDark } = useTheme()
   const { t } = useTranslation()
+  const showAlphaSlider = useBlurSupport()
+
+  // Helper to get alpha value based on blur support
+  const getAlpha = (defaultAlpha: number) => {
+    return showAlphaSlider ? defaultAlpha : 1
+  }
 
   const predefineAppBgColor: RgbaColor[] = [
     isDark
@@ -21,55 +27,64 @@ export function ColorPickerAppBgColor() {
           r: 25,
           g: 25,
           b: 25,
-          a: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : 0.4,
+          a: getAlpha(0.4),
         }
       : {
           r: 255,
           g: 255,
           b: 255,
-          a: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : 0.4,
+          a: getAlpha(0.4),
         },
     {
       r: 70,
       g: 79,
       b: 229,
-      a: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : 0.5,
+      a: getAlpha(0.5),
     },
     {
       r: 238,
       g: 130,
       b: 238,
-      a: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : 0.5,
+      a: getAlpha(0.5),
     },
 
     {
       r: 255,
       g: 99,
       b: 71,
-      a: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : 0.5,
+      a: getAlpha(0.5),
     },
     {
       r: 255,
       g: 165,
       b: 0,
-      a: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : 0.5,
+      a: getAlpha(0.5),
     },
   ]
 
+  // 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) => {
         const isSelected =
           (item.r === appBgColor.r &&
-          item.g === appBgColor.g &&
-          item.b === appBgColor.b &&
-          item.a === appBgColor.a) ||
-          (isDefaultColor(appBgColor) && isDefaultColor(item))
+            item.g === appBgColor.g &&
+            item.b === appBgColor.b &&
+            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/containers/DropdownAssistant.tsx b/web-app/src/containers/DropdownAssistant.tsx
index a75925002..e474df9ed 100644
--- a/web-app/src/containers/DropdownAssistant.tsx
+++ b/web-app/src/containers/DropdownAssistant.tsx
@@ -33,7 +33,7 @@ const DropdownAssistant = () => {
   return (
     <>
       <DropdownMenu open={dropdownOpen} onOpenChange={setDropdownOpen}>
-        <div className="flex items-center justify-between gap-2 bg-main-view-fg/5 py-1 hover:bg-main-view-fg/8 px-2 rounded-sm">
+        <div className="inline-flex items-center justify-between gap-2 bg-main-view-fg/5 py-1 hover:bg-main-view-fg/8 px-2 rounded-sm">
           <DropdownMenuTrigger asChild>
             <button className="font-medium cursor-pointer flex items-center gap-1.5 relative z-20 max-w-40">
               <div className="text-main-view-fg/80 flex items-center gap-1">
diff --git a/web-app/src/containers/LeftPanel.tsx b/web-app/src/containers/LeftPanel.tsx
index 1c91f610d..6fbd40106 100644
--- a/web-app/src/containers/LeftPanel.tsx
+++ b/web-app/src/containers/LeftPanel.tsx
@@ -643,7 +643,7 @@ const LeftPanel = () => {
                   data-test-id={`menu-${menu.title}`}
                   activeOptions={{ exact: true }}
                   className={cn(
-                    'flex items-center gap-1.5 cursor-pointer hover:bg-left-panel-fg/10 py-1 px-1 rounded',
+                    'flex items-center gap-1.5 cursor-pointer hover:bg-left-panel-fg/10 py-1 my-0.5 px-1 rounded',
                     isActive && 'bg-left-panel-fg/10'
                   )}
                 >
diff --git a/web-app/src/hooks/__tests__/useAppearance.test.ts b/web-app/src/hooks/__tests__/useAppearance.test.ts
index 8a1f3437c..3d28213ed 100644
--- a/web-app/src/hooks/__tests__/useAppearance.test.ts
+++ b/web-app/src/hooks/__tests__/useAppearance.test.ts
@@ -31,6 +31,8 @@ vi.mock('zustand/middleware', () => ({
 // Mock global constants
 Object.defineProperty(global, 'IS_WINDOWS', { value: false, writable: true })
 Object.defineProperty(global, 'IS_LINUX', { value: false, writable: true })
+Object.defineProperty(global, 'IS_MACOS', { value: false, writable: true })
+Object.defineProperty(global, 'IS_TAURI', { value: false, writable: true })
 Object.defineProperty(global, 'IS_WEB_APP', { value: false, writable: true })
 
 describe('useAppearance', () => {
@@ -212,24 +214,55 @@ describe('useAppearance', () => {
 
       const { result } = renderHook(() => useAppearance())
       const testColor = { r: 128, g: 64, b: 192, a: 0.8 }
-      
+
       act(() => {
         result.current.setAppBgColor(testColor)
       })
-      
-      expect(result.current.appBgColor).toEqual(testColor)
+
+      // In web environment (IS_TAURI=false), alpha is forced to 1
+      expect(result.current.appBgColor).toEqual({ ...testColor, a: 1 })
     })
 
     it('should handle transparent colors', () => {
       const { result } = renderHook(() => useAppearance())
       const transparentColor = { r: 100, g: 100, b: 100, a: 0 }
-      
+
       act(() => {
         result.current.setAppAccentBgColor(transparentColor)
       })
-      
+
       expect(result.current.appAccentBgColor).toEqual(transparentColor)
     })
+
+    it('should preserve alpha when blur is supported (macOS)', () => {
+      // Mock macOS environment
+      Object.defineProperty(global, 'IS_MACOS', { value: true, writable: true })
+      Object.defineProperty(global, 'IS_TAURI', { value: true, writable: true })
+      Object.defineProperty(global, 'IS_WINDOWS', { value: false, writable: true })
+      Object.defineProperty(global, 'IS_LINUX', { value: false, writable: true })
+
+      const setPropertySpy = vi.fn()
+      Object.defineProperty(document.documentElement, 'style', {
+        value: {
+          setProperty: setPropertySpy,
+        },
+        writable: true,
+      })
+
+      const { result } = renderHook(() => useAppearance())
+      const testColor = { r: 128, g: 64, b: 192, a: 0.5 }
+
+      act(() => {
+        result.current.setAppBgColor(testColor)
+      })
+
+      // On macOS with Tauri, alpha should be preserved
+      expect(result.current.appBgColor).toEqual(testColor)
+
+      // Reset for other tests
+      Object.defineProperty(global, 'IS_MACOS', { value: false, writable: true })
+      Object.defineProperty(global, 'IS_TAURI', { value: false, writable: true })
+    })
   })
 
   describe('Edge cases', () => {
diff --git a/web-app/src/hooks/useAppearance.ts b/web-app/src/hooks/useAppearance.ts
index 51a1ce10e..1ab7797fc 100644
--- a/web-app/src/hooks/useAppearance.ts
+++ b/web-app/src/hooks/useAppearance.ts
@@ -4,6 +4,9 @@ import { localStorageKey } from '@/constants/localStorage'
 import { RgbaColor } from 'react-colorful'
 import { rgb, oklch, formatCss } from 'culori'
 import { useTheme } from './useTheme'
+import { useEffect, useState } from 'react'
+import { getServiceHub } from '@/hooks/useServiceHub'
+import { supportsBlurEffects } from '@/utils/blurSupport'
 
 export type FontSize = '14px' | '15px' | '16px' | '18px'
 export type ChatWidth = 'full' | 'compact'
@@ -41,19 +44,37 @@ export const fontSizeOptions = [
   { label: 'Extra Large', value: '18px' as FontSize },
 ]
 
+// Helper to determine if blur effects are supported
+// This will be dynamically checked on Windows and Linux
+let blurEffectsSupported = true
+if ((IS_WINDOWS || IS_LINUX) && IS_TAURI) {
+  // Default to false for Windows/Linux, will be checked async
+  blurEffectsSupported = false
+}
+
+// Helper to get the appropriate alpha value
+const getAlphaValue = () => {
+  // Web always uses alpha = 1
+  if (!IS_TAURI) return 1
+  // Windows/Linux use 1 if blur not supported, 0.4 if supported
+  if ((IS_WINDOWS || IS_LINUX) && !blurEffectsSupported) return 1
+  // macOS and Windows/Linux with blur support use 0.4
+  return 0.4
+}
+
 // Default appearance settings
 const defaultFontSize: FontSize = '15px'
 const defaultAppBgColor: RgbaColor = {
   r: 25,
   g: 25,
   b: 25,
-  a: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : 0.4,
+  a: getAlphaValue(),
 }
 const defaultLightAppBgColor: RgbaColor = {
   r: 255,
   g: 255,
   b: 255,
-  a: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : 0.4,
+  a: getAlphaValue(),
 }
 const defaultAppMainViewBgColor: RgbaColor = { r: 25, g: 25, b: 25, a: 1 }
 const defaultLightAppMainViewBgColor: RgbaColor = {
@@ -89,10 +110,15 @@ 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 => {
@@ -128,6 +154,59 @@ export const getDefaultTextColor = (isDark: boolean): string => {
   return isDark ? defaultDarkLeftPanelTextColor : defaultLightLeftPanelTextColor
 }
 
+// Hook to check if alpha slider should be shown
+export const useBlurSupport = () => {
+  const [supportsBlur, setSupportsBlur] = useState(
+    IS_MACOS && IS_TAURI // Default to true only for macOS
+  )
+
+  useEffect(() => {
+    const checkBlurSupport = async () => {
+      if ((IS_WINDOWS || IS_LINUX) && IS_TAURI) {
+        try {
+          // Get hardware info to check OS version
+          const hardwareInfo = await getServiceHub()
+            .hardware()
+            .getHardwareInfo()
+          const supported = supportsBlurEffects(hardwareInfo)
+
+          blurEffectsSupported = supported
+          setSupportsBlur(supported)
+
+          const platform = IS_WINDOWS ? 'Windows' : 'Linux'
+          if (supported) {
+            console.log(
+              `✅ ${platform} blur effects: SUPPORTED - Alpha slider will be shown`
+            )
+          } else {
+            console.log(
+              `❌ ${platform} blur effects: NOT SUPPORTED - Alpha slider will be hidden, alpha set to 1`
+            )
+          }
+        } catch (error) {
+          console.error(
+            `❌ Failed to check ${IS_WINDOWS ? 'Windows' : 'Linux'} blur support:`,
+            error
+          )
+          setSupportsBlur(false)
+        }
+      } else if (IS_MACOS && IS_TAURI) {
+        console.log(
+          '🍎 macOS platform: Blur effects supported, alpha slider shown'
+        )
+      } else if (!IS_TAURI) {
+        console.log('🌐 Web platform: Alpha slider hidden, alpha set to 1')
+      }
+    }
+
+    checkBlurSupport()
+  }, [])
+
+  // Return true if alpha slider should be shown
+  // Show on macOS (always), and conditionally on Windows/Linux based on detection
+  return IS_TAURI && (IS_MACOS || supportsBlur)
+}
+
 export const useAppearance = create<AppearanceState>()(
   persist(
     (set) => {
@@ -154,8 +233,11 @@ 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,
@@ -295,6 +377,11 @@ export const useAppearance = create<AppearanceState>()(
             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 }
+          }
+
           // Convert RGBA to a format culori can work with
           const culoriRgb = rgb({
             mode: 'rgb',
@@ -565,11 +652,9 @@ 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/hooks/useTheme.ts b/web-app/src/hooks/useTheme.ts
index bf17cd90b..35556a4e7 100644
--- a/web-app/src/hooks/useTheme.ts
+++ b/web-app/src/hooks/useTheme.ts
@@ -32,7 +32,9 @@ export const useTheme = create<ThemeState>()(
             await getServiceHub().theme().setTheme(null)
             set(() => ({ activeTheme, isDark: isDarkMode }))
           } else {
-            await getServiceHub().theme().setTheme(activeTheme as ThemeMode)
+            await getServiceHub()
+              .theme()
+              .setTheme(activeTheme as ThemeMode)
             set(() => ({ activeTheme, isDark: activeTheme === 'dark' }))
           }
         },
diff --git a/web-app/src/index.css b/web-app/src/index.css
index 38f741d21..349b36f21 100644
--- a/web-app/src/index.css
+++ b/web-app/src/index.css
@@ -56,7 +56,6 @@
 @layer base {
   body {
     @apply overflow-hidden;
-    background-color: white;
     min-height: 100vh;
     min-height: -webkit-fill-available;
     padding-top: env(safe-area-inset-top, 0px);
diff --git a/web-app/src/providers/AppearanceProvider.tsx b/web-app/src/providers/AppearanceProvider.tsx
index 9f715e94f..290c42231 100644
--- a/web-app/src/providers/AppearanceProvider.tsx
+++ b/web-app/src/providers/AppearanceProvider.tsx
@@ -1,5 +1,5 @@
 import { useEffect } from 'react'
-import { useAppearance } from '@/hooks/useAppearance'
+import { useAppearance, useBlurSupport } from '@/hooks/useAppearance'
 import { useTheme } from '@/hooks/useTheme'
 import {
   isDefaultColor,
@@ -29,14 +29,37 @@ export function AppearanceProvider() {
     appDestructiveTextColor,
   } = useAppearance()
   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
     document.documentElement.style.setProperty('--font-size-base', fontSize)
 
-    // Hide alpha slider when IS_LINUX || !IS_TAURI
-    const shouldHideAlpha = IS_LINUX || !IS_TAURI
+    // Hide alpha slider when blur is not supported
+    const shouldHideAlpha = !showAlphaSlider
     let alphaStyleElement = document.getElementById('alpha-slider-style')
 
     if (shouldHideAlpha) {
@@ -55,12 +78,13 @@ export function AppearanceProvider() {
     // Import culori functions dynamically to avoid SSR issues
     import('culori').then(({ rgb, oklch, formatCss }) => {
       // Convert RGBA to a format culori can work with
+      // Use alpha = 1 when blur is not supported
       const culoriRgb = rgb({
         mode: 'rgb',
         r: appBgColor.r / 255,
         g: appBgColor.g / 255,
         b: appBgColor.b / 255,
-        alpha: IS_WINDOWS || IS_LINUX || !IS_TAURI ? 1 : appBgColor.a,
+        alpha: showAlphaSlider ? appBgColor.a : 1,
       })
 
       const culoriRgbMainView = rgb({
@@ -176,6 +200,7 @@ export function AppearanceProvider() {
     appAccentTextColor,
     appDestructiveBgColor,
     appDestructiveTextColor,
+    showAlphaSlider,
   ])
 
   // Update appearance when theme changes
@@ -194,6 +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
diff --git a/web-app/src/providers/ThemeProvider.tsx b/web-app/src/providers/ThemeProvider.tsx
index d6fbbc9e4..350f8b21d 100644
--- a/web-app/src/providers/ThemeProvider.tsx
+++ b/web-app/src/providers/ThemeProvider.tsx
@@ -1,5 +1,6 @@
 import { useEffect } from 'react'
 import { useTheme, checkOSDarkMode } from '@/hooks/useTheme'
+import { isPlatformTauri } from '@/lib/platform/utils'
 
 /**
  * ThemeProvider ensures theme settings are applied on every page load
@@ -11,13 +12,22 @@ export function ThemeProvider() {
 
   // Detect OS theme on mount and apply it
   useEffect(() => {
-    // If theme is set to auto, detect OS preference
-    if (activeTheme === 'auto') {
-      const isDarkMode = checkOSDarkMode()
-      setIsDark(isDarkMode)
-      setTheme('auto')
+    // Force refresh theme on mount to handle Linux startup timing issues
+    const refreshTheme = () => {
+      if (activeTheme === 'auto') {
+        const isDarkMode = checkOSDarkMode()
+        setIsDark(isDarkMode)
+        setTheme('auto')
+      }
     }
 
+    // Initial refresh
+    refreshTheme()
+
+    // On Linux, desktop environment may not be ready immediately
+    // Add a delayed refresh to catch the correct OS theme
+    const timeoutId = setTimeout(refreshTheme, 100)
+
     // Listen for changes in OS theme preference
     const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
 
@@ -26,16 +36,41 @@ export function ThemeProvider() {
       if (activeTheme === 'auto') {
         setIsDark(e.matches)
       } else {
-        setTheme(e.matches ? 'dark' : 'light')
+        setTheme(activeTheme)
       }
     }
 
-    // Add event listener
+    // Add event listener for browser/web
     mediaQuery.addEventListener('change', handleThemeChange)
 
+    // Listen to Tauri native theme events (uses XDG Desktop Portal on Linux)
+    let unlistenTauri: (() => void) | undefined
+
+    if (isPlatformTauri()) {
+      import('@tauri-apps/api/event')
+        .then(({ listen }) => {
+          return listen<string>('theme-changed', (event) => {
+            if (activeTheme === 'auto') {
+              const isDark = event.payload === 'dark'
+              setIsDark(isDark)
+            }
+          })
+        })
+        .then((unlisten) => {
+          unlistenTauri = unlisten
+        })
+        .catch((err) => {
+          console.error('Failed to setup Tauri theme listener:', err)
+        })
+    }
+
     // Clean up
     return () => {
+      clearTimeout(timeoutId)
       mediaQuery.removeEventListener('change', handleThemeChange)
+      if (unlistenTauri) {
+        unlistenTauri()
+      }
     }
   }, [activeTheme, setIsDark, setTheme])
 
diff --git a/web-app/src/routes/index.tsx b/web-app/src/routes/index.tsx
index 2b6f89a1e..982c19c94 100644
--- a/web-app/src/routes/index.tsx
+++ b/web-app/src/routes/index.tsx
@@ -11,7 +11,7 @@ import SetupScreen from '@/containers/SetupScreen'
 import { route } from '@/constants/routes'
 
 type SearchParams = {
-  model?: {
+  'model'?: {
     id: string
     provider: string
   }
@@ -33,7 +33,10 @@ export const Route = createFileRoute(route.home as any)({
     }
 
     // Only include temporary-chat if it's explicitly true
-    if (search[TEMPORARY_CHAT_QUERY_ID] === 'true' || search[TEMPORARY_CHAT_QUERY_ID] === true) {
+    if (
+      search[TEMPORARY_CHAT_QUERY_ID] === 'true' ||
+      search[TEMPORARY_CHAT_QUERY_ID] === true
+    ) {
       result['temporary-chat'] = true
     }
 
@@ -77,7 +80,7 @@ function Index() {
       </HeaderPage>
       <div
         className={cn(
-          'h-full overflow-y-auto flex flex-col gap-2 justify-center px-3 sm:px-4 md:px-8 py-4 md:py-0'
+          'h-full overflow-y-auto inline-flex flex-col gap-2 justify-center px-3 sm:px-4 md:px-8 py-4 md:py-0'
         )}
       >
         <div
@@ -110,7 +113,9 @@ function Index() {
                 isMobile ? 'text-base' : 'text-lg'
               )}
             >
-              {isTemporaryChat ? t('chat:temporaryChatDescription') : t('chat:description')}
+              {isTemporaryChat
+                ? t('chat:temporaryChatDescription')
+                : t('chat:description')}
             </p>
           </div>
           <div className="flex-1 shrink-0">
diff --git a/web-app/src/routes/logs.tsx b/web-app/src/routes/logs.tsx
index 95afde4d7..cedb2751f 100644
--- a/web-app/src/routes/logs.tsx
+++ b/web-app/src/routes/logs.tsx
@@ -31,17 +31,20 @@ function LogsViewer() {
   useEffect(() => {
     let lastLogsLength = 0
     function updateLogs() {
-      serviceHub.app().readLogs().then((logData) => {
-        let needScroll = false
-        const filteredLogs = logData.filter(Boolean) as LogEntry[]
-        if (filteredLogs.length > lastLogsLength) needScroll = true
+      serviceHub
+        .app()
+        .readLogs()
+        .then((logData) => {
+          let needScroll = false
+          const filteredLogs = logData.filter(Boolean) as LogEntry[]
+          if (filteredLogs.length > lastLogsLength) needScroll = true
 
-        lastLogsLength = filteredLogs.length
-        setLogs(filteredLogs)
+          lastLogsLength = filteredLogs.length
+          setLogs(filteredLogs)
 
-        // Scroll to bottom after initial logs are loaded
-        if (needScroll) setTimeout(() => scrollToBottom(), 100)
-      })
+          // Scroll to bottom after initial logs are loaded
+          if (needScroll) setTimeout(() => scrollToBottom(), 100)
+        })
     }
     updateLogs()
 
diff --git a/web-app/src/services/theme/tauri.ts b/web-app/src/services/theme/tauri.ts
index e05d60c74..8cd8c4e28 100644
--- a/web-app/src/services/theme/tauri.ts
+++ b/web-app/src/services/theme/tauri.ts
@@ -2,7 +2,8 @@
  * Tauri Theme Service - Desktop implementation
  */
 
-import { getCurrentWindow, Theme } from '@tauri-apps/api/window'
+import { Theme } from '@tauri-apps/api/window'
+import { getAllWebviewWindows, type WebviewWindow } from '@tauri-apps/api/webviewWindow'
 import type { ThemeMode } from './types'
 import { DefaultThemeService } from './default'
 
@@ -10,7 +11,27 @@ export class TauriThemeService extends DefaultThemeService {
   async setTheme(theme: ThemeMode): Promise<void> {
     try {
       const tauriTheme = theme as Theme | null
-      await getCurrentWindow().setTheme(tauriTheme)
+
+      // Update all open windows, not just the current one
+      const allWindows = await getAllWebviewWindows()
+
+      // Convert to array if it's not already
+      const windowsArray: WebviewWindow[] = Array.isArray(allWindows)
+        ? allWindows
+        : Object.values(allWindows)
+
+      await Promise.all(
+        windowsArray.map(async (window) => {
+          try {
+            await window.setTheme(tauriTheme)
+          } catch (error) {
+            console.error(
+              `Failed to set theme for window ${window.label}:`,
+              error
+            )
+          }
+        })
+      )
     } catch (error) {
       console.error('Error setting theme in Tauri:', error)
       throw error
@@ -21,7 +42,7 @@ export class TauriThemeService extends DefaultThemeService {
     return {
       setTheme: (theme: ThemeMode): Promise<void> => {
         return this.setTheme(theme)
-      }
+      },
     }
   }
 }
diff --git a/web-app/src/services/window/tauri.ts b/web-app/src/services/window/tauri.ts
index a6dd643c7..a0e976ced 100644
--- a/web-app/src/services/window/tauri.ts
+++ b/web-app/src/services/window/tauri.ts
@@ -7,8 +7,39 @@ import type { WindowConfig, WebviewWindowInstance } from './types'
 import { DefaultWindowService } from './default'
 
 export class TauriWindowService extends DefaultWindowService {
-  async createWebviewWindow(config: WindowConfig): Promise<WebviewWindowInstance> {
+  async createWebviewWindow(
+    config: WindowConfig
+  ): Promise<WebviewWindowInstance> {
     try {
+      // Get current theme from localStorage
+      const storedTheme = localStorage.getItem('jan-theme')
+      let theme: 'light' | 'dark' | undefined = undefined
+
+      if (storedTheme) {
+        try {
+          const themeData = JSON.parse(storedTheme)
+          const activeTheme = themeData?.state?.activeTheme
+          const isDark = themeData?.state?.isDark
+
+          // Set theme based on stored preference
+          if (activeTheme === 'auto') {
+            theme = undefined // Let OS decide
+          } else if (
+            activeTheme === 'dark' ||
+            (activeTheme === 'auto' && isDark)
+          ) {
+            theme = 'dark'
+          } else if (
+            activeTheme === 'light' ||
+            (activeTheme === 'auto' && !isDark)
+          ) {
+            theme = 'light'
+          }
+        } catch (e) {
+          console.warn('Failed to parse theme from localStorage:', e)
+        }
+      }
+
       const webviewWindow = new WebviewWindow(config.label, {
         url: config.url,
         title: config.title,
@@ -20,8 +51,12 @@ export class TauriWindowService extends DefaultWindowService {
         maximizable: config.maximizable,
         closable: config.closable,
         fullscreen: config.fullscreen,
+        theme: theme,
       })
 
+      // Setup theme listener for this window
+      this.setupThemeListenerForWindow(webviewWindow)
+
       return {
         label: config.label,
         async close() {
@@ -38,7 +73,7 @@ export class TauriWindowService extends DefaultWindowService {
         },
         async setTitle(title: string) {
           await webviewWindow.setTitle(title)
-        }
+        },
       }
     } catch (error) {
       console.error('Error creating Tauri window:', error)
@@ -46,10 +81,12 @@ export class TauriWindowService extends DefaultWindowService {
     }
   }
 
-  async getWebviewWindowByLabel(label: string): Promise<WebviewWindowInstance | null> {
+  async getWebviewWindowByLabel(
+    label: string
+  ): Promise<WebviewWindowInstance | null> {
     try {
       const existingWindow = await WebviewWindow.getByLabel(label)
-      
+
       if (existingWindow) {
         return {
           label: label,
@@ -67,10 +104,10 @@ export class TauriWindowService extends DefaultWindowService {
           },
           async setTitle(title: string) {
             await existingWindow.setTitle(title)
-          }
+          },
         }
       }
-      
+
       return null
     } catch (error) {
       console.error('Error getting Tauri window by label:', error)
@@ -135,8 +172,35 @@ export class TauriWindowService extends DefaultWindowService {
         center: true,
       })
     } catch (error) {
-      console.error('Error opening local API server logs window in Tauri:', error)
+      console.error(
+        'Error opening local API server logs window in Tauri:',
+        error
+      )
       throw error
     }
   }
+
+  private setupThemeListenerForWindow(window: WebviewWindow): void {
+    // Listen to theme change events from Tauri backend
+    import('@tauri-apps/api/event')
+      .then(({ listen }) => {
+        return listen<string>('theme-changed', async (event) => {
+          const theme = event.payload
+          try {
+            if (theme === 'dark') {
+              await window.setTheme('dark')
+            } else if (theme === 'light') {
+              await window.setTheme('light')
+            } else {
+              await window.setTheme(null)
+            }
+          } catch (err) {
+            console.error('Failed to update window theme:', err)
+          }
+        })
+      })
+      .catch((err) => {
+        console.error('Failed to setup theme listener for window:', err)
+      })
+  }
 }
diff --git a/web-app/src/utils/blurSupport.ts b/web-app/src/utils/blurSupport.ts
new file mode 100644
index 000000000..6a87be598
--- /dev/null
+++ b/web-app/src/utils/blurSupport.ts
@@ -0,0 +1,65 @@
+/**
+ * Utility to check if the system supports blur/acrylic effects
+ * based on OS information from hardware data
+ */
+
+import type { HardwareData } from '@/hooks/useHardware'
+
+/**
+ * Check if Windows supports blur effects based on build number
+ * Windows 10 build 17134 (version 1803) and later support acrylic effects
+ */
+function checkWindowsBlurSupport(osName: string): boolean {
+  // os_name format: "Windows 10 Pro (build 22631)" or similar
+  const buildMatch = osName.match(/build\s+(\d+)/i)
+
+  if (buildMatch && buildMatch[1]) {
+    const build = parseInt(buildMatch[1], 10)
+    return build >= 17134
+  }
+
+  // If we can't detect build number, assume modern Windows supports blur
+  return true
+}
+
+/**
+ * Check if Linux supports blur effects based on desktop environment
+ */
+function checkLinuxBlurSupport(): boolean {
+  // Check environment variables (only available in Tauri)
+  if (typeof window === 'undefined') return false
+
+  // These checks would need to be done on the backend
+  // For now, we'll assume Linux with common DEs supports blur
+  return true
+}
+
+/**
+ * Check if the system supports blur/acrylic effects
+ *
+ * @param hardwareData - Hardware data from the hardware plugin
+ * @returns true if blur effects are supported
+ */
+export function supportsBlurEffects(hardwareData: HardwareData | null): boolean {
+  if (!hardwareData) return false
+
+  const { os_type, os_name } = hardwareData
+
+  // macOS always supports blur/vibrancy effects
+  if (os_type === 'macos') {
+    return true
+  }
+
+  // Windows: Check build number
+  if (os_type === 'windows') {
+    return checkWindowsBlurSupport(os_name)
+  }
+
+  // Linux: Check desktop environment (simplified for now)
+  if (os_type === 'linux') {
+    return checkLinuxBlurSupport()
+  }
+
+  // Unknown platforms: assume no blur support
+  return false
+}