diff --git a/src/components/common/ModeToggle.tsx b/src/components/common/ModeToggle.tsx
new file mode 100644
index 0000000..9669ca3
--- /dev/null
+++ b/src/components/common/ModeToggle.tsx
@@ -0,0 +1,34 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ */
+
+import { useTranslation } from 'react-i18next';
+import { Moon, Sun } from 'lucide-react';
+
+import { Button } from '@/components/ui/button';
+import { useUIStore } from '@/stores/uiStore';
+
+// Single-click light/dark toggle. Color themes and corner radius live on the
+// Appearance settings page instead of a dropdown.
+export function ModeToggle() {
+  const { t } = useTranslation();
+  const theme = useUIStore((s) => s.theme);
+  const setTheme = useUIStore((s) => s.setTheme);
+
+  return (
+    <Button
+      variant="ghost"
+      size="icon"
+      onClick={() => setTheme(theme === 'light' ? 'dark' : 'light')}
+      aria-label={
+        theme === 'light'
+          ? t('appearance.switchToDark', 'Switch to dark mode')
+          : t('appearance.switchToLight', 'Switch to light mode')
+      }
+    >
+      {theme === 'light' ? <Moon className="h-4 w-4" /> : <Sun className="h-4 w-4" />}
+    </Button>
+  );
+}
diff --git a/src/components/common/ThemeSwitcher.tsx b/src/components/common/ThemeSwitcher.tsx
deleted file mode 100644
index 02f3993..0000000
--- a/src/components/common/ThemeSwitcher.tsx
+++ /dev/null
@@ -1,78 +0,0 @@
-/*
- * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
- *
- * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
- */
-
-import { useTranslation } from 'react-i18next';
-import { Moon, Palette, Sun, Square, Radius } from 'lucide-react';
-
-import { Button } from '@/components/ui/button';
-import {
-  DropdownMenu,
-  DropdownMenuContent,
-  DropdownMenuLabel,
-  DropdownMenuRadioGroup,
-  DropdownMenuRadioItem,
-  DropdownMenuSeparator,
-  DropdownMenuTrigger,
-} from '@/components/ui/dropdown-menu';
-import { COLOR_THEMES, useUIStore, type ColorTheme, type Radius as RadiusValue, type Theme } from '@/stores/uiStore';
-
-export function ThemeSwitcher() {
-  const { t } = useTranslation();
-  const theme = useUIStore((s) => s.theme);
-  const setTheme = useUIStore((s) => s.setTheme);
-  const colorTheme = useUIStore((s) => s.colorTheme);
-  const setColorTheme = useUIStore((s) => s.setColorTheme);
-  const radius = useUIStore((s) => s.radius);
-  const setRadius = useUIStore((s) => s.setRadius);
-
-  return (
-    <DropdownMenu>
-      <DropdownMenuTrigger asChild>
-        <Button variant="ghost" size="icon" aria-label={t('appearance.label', 'Appearance')}>
-          <Palette className="h-4 w-4" />
-        </Button>
-      </DropdownMenuTrigger>
-      <DropdownMenuContent align="end" className="w-52">
-        <DropdownMenuLabel>{t('appearance.mode', 'Mode')}</DropdownMenuLabel>
-        <DropdownMenuRadioGroup value={theme} onValueChange={(value) => setTheme(value as Theme)}>
-          <DropdownMenuRadioItem value="light">
-            <Sun className="mr-2 h-4 w-4" />
-            {t('appearance.light', 'Light')}
-          </DropdownMenuRadioItem>
-          <DropdownMenuRadioItem value="dark">
-            <Moon className="mr-2 h-4 w-4" />
-            {t('appearance.dark', 'Dark')}
-          </DropdownMenuRadioItem>
-        </DropdownMenuRadioGroup>
-        <DropdownMenuSeparator />
-        <DropdownMenuLabel>{t('appearance.colorTheme', 'Color theme')}</DropdownMenuLabel>
-        <DropdownMenuRadioGroup value={colorTheme} onValueChange={(value) => setColorTheme(value as ColorTheme)}>
-          {COLOR_THEMES.map((entry) => (
-            <DropdownMenuRadioItem key={entry.value} value={entry.value}>
-              <span
-                className="mr-2 h-3.5 w-3.5 shrink-0 rounded-full border border-border"
-                style={{ background: entry.swatch }}
-              />
-              {t(entry.labelKey, entry.fallback)}
-            </DropdownMenuRadioItem>
-          ))}
-        </DropdownMenuRadioGroup>
-        <DropdownMenuSeparator />
-        <DropdownMenuLabel>{t('appearance.corners', 'Corners')}</DropdownMenuLabel>
-        <DropdownMenuRadioGroup value={radius} onValueChange={(value) => setRadius(value as RadiusValue)}>
-          <DropdownMenuRadioItem value="rounded">
-            <Radius className="mr-2 h-4 w-4" />
-            {t('appearance.rounded', 'Rounded')}
-          </DropdownMenuRadioItem>
-          <DropdownMenuRadioItem value="square">
-            <Square className="mr-2 h-4 w-4" />
-            {t('appearance.square', 'Square')}
-          </DropdownMenuRadioItem>
-        </DropdownMenuRadioGroup>
-      </DropdownMenuContent>
-    </DropdownMenu>
-  );
-}
diff --git a/src/components/layout/TopBar.tsx b/src/components/layout/TopBar.tsx
index 52cd6f1..f2dd57e 100644
--- a/src/components/layout/TopBar.tsx
+++ b/src/components/layout/TopBar.tsx
@@ -20,7 +20,7 @@ import {
   DropdownMenuTrigger,
 } from '@/components/ui/dropdown-menu';
 import Logo from '@/components/common/Logo';
-import { ThemeSwitcher } from '@/components/common/ThemeSwitcher';
+import { ModeToggle } from '@/components/common/ModeToggle';
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip';
 import { EnterpriseUpsell } from '@/components/common/EnterpriseUpsell';
 import { findFirstAccessibleLinkInLayout, findFirstVisibleLinkInLayout, visibleLayouts } from '@/lib/layout';
@@ -122,7 +122,7 @@ export function TopBar() {
 
         <CommandPalette open={paletteOpen} onOpenChange={setPaletteOpen} />
 
-        <ThemeSwitcher />
+        <ModeToggle />
 
         <DropdownMenu>
           <DropdownMenuTrigger asChild>
diff --git a/src/i18n/en.json b/src/i18n/en.json
index 07977b9..d95925a 100644
--- a/src/i18n/en.json
+++ b/src/i18n/en.json
@@ -9,6 +9,8 @@
     "mode": "Mode",
     "rounded": "Rounded",
     "square": "Square",
+    "switchToDark": "Switch to dark mode",
+    "switchToLight": "Switch to light mode",
     "theme": {
       "forest": "Forest",
       "ocean": "Ocean",
diff --git a/src/pages/LoginPage.tsx b/src/pages/LoginPage.tsx
index ae97e41..c56c575 100644
--- a/src/pages/LoginPage.tsx
+++ b/src/pages/LoginPage.tsx
@@ -10,7 +10,7 @@ import { useTranslation } from 'react-i18next';
 import { ArrowRight, Loader2 } from 'lucide-react';
 
 import Logo from '@/components/common/Logo';
-import { ThemeSwitcher } from '@/components/common/ThemeSwitcher';
+import { ModeToggle } from '@/components/common/ModeToggle';
 import { useDocumentTitle } from '@/hooks/useDocumentTitle';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
@@ -46,7 +46,7 @@ export default function LoginPage() {
   return (
     <div className="flex min-h-screen items-center justify-center bg-content-background px-4">
       <div className="fixed right-4 top-4 z-50">
-        <ThemeSwitcher />
+        <ModeToggle />
       </div>
       <Card className="w-full max-w-sm shadow-sm">
         <CardHeader className="items-center text-center">
diff --git a/src/pages/OAuthCallback.tsx b/src/pages/OAuthCallback.tsx
index 028b5b0..2ce6fd7 100644
--- a/src/pages/OAuthCallback.tsx
+++ b/src/pages/OAuthCallback.tsx
@@ -10,7 +10,7 @@ import { useTranslation } from 'react-i18next';
 import { Loader2 } from 'lucide-react';
 
 import { useAuthStore } from '@/stores/authStore';
-import { ThemeSwitcher } from '@/components/common/ThemeSwitcher';
+import { ModeToggle } from '@/components/common/ModeToggle';
 import { useDocumentTitle } from '@/hooks/useDocumentTitle';
 import { getBasePath } from '@/lib/basePath';
 import { exchangeCode, getStoredOAuthData, clearStoredOAuthData, getOAuthRedirectUri } from '@/services/auth/oauth';
@@ -87,7 +87,7 @@ export default function OAuthCallback() {
     return (
       <div className="flex min-h-screen items-center justify-center bg-background px-4">
         <div className="fixed right-4 top-4 z-50">
-          <ThemeSwitcher />
+          <ModeToggle />
         </div>
         <div className="w-full max-w-sm space-y-4 text-center">
           <p className="text-sm text-destructive" role="alert">
@@ -104,7 +104,7 @@ export default function OAuthCallback() {
   return (
     <div className="flex min-h-screen items-center justify-center bg-background">
       <div className="fixed right-4 top-4 z-50">
-        <ThemeSwitcher />
+        <ModeToggle />
       </div>
       <div className="flex flex-col items-center gap-3">
         <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />