diff --git a/apps/theming/css/ionos/_layout.css b/apps/theming/css/ionos/_layout.css
index 3293bdc987c25..38e4cf129d404 100644
--- a/apps/theming/css/ionos/_layout.css
+++ b/apps/theming/css/ionos/_layout.css
@@ -57,13 +57,6 @@
 	}
 
 	.contactsmenu__menu {
-		.contact__action__icon {
-			filter: invert(100%);
-			@media (prefers-color-scheme: light) {
-				filter: none;
-			}
-		}
-
 		.contactsmenu__menu__content__footer .button-vue--vue-tertiary {
 			background-color: var(--ion-button-secondary-background-default);
 			color: var(--ion-button-secondary-text);
@@ -90,7 +83,6 @@
 }
 
 
-
 #content-vue {
 	margin: var(--header-height) 0 0 0;
 	width: 100%;
@@ -119,12 +111,6 @@
 
 	.panel {
 		background-color: var(--ion-surface-secondary);
-		.panel--header img {
-			filter: none;
-			@media (prefers-color-scheme: dark) {
-				filter: var(--background-invert-if-bright);
-			}
-		}
 	}
 }
 
diff --git a/apps/theming/css/ionos/activity.css b/apps/theming/css/ionos/activity.css
deleted file mode 100644
index a2a7b52cecd78..0000000000000
--- a/apps/theming/css/ionos/activity.css
+++ /dev/null
@@ -1,8 +0,0 @@
-.content.app-activity {
-	img {
-		filter: none;
-		@media (prefers-color-scheme: dark) {
-			filter: invert(100%);
-		}
-	}
-}
diff --git a/apps/theming/css/ionos/files.css b/apps/theming/css/ionos/files.css
index 4838c7ac43515..e2759b6fbeca4 100644
--- a/apps/theming/css/ionos/files.css
+++ b/apps/theming/css/ionos/files.css
@@ -262,12 +262,6 @@ div.v-popper--theme-dropdown.v-popper__popper:has(.v-popper__wrapper), .header-m
 				}
 
 				a {
-					img.account-menu-entry__icon, img.account-menu-entry__icon--active {
-						filter: none;
-						@media (prefers-color-scheme: dark) {
-								filter: invert(100%);
-						}
-					}
 					.list-item-content__name {
 						color: var(--ion-context-menu-item-text) !important;
 					}
diff --git a/apps/theming/css/ionos/notes.css b/apps/theming/css/ionos/notes.css
index 9b30e1f71d5de..973222218e13a 100644
--- a/apps/theming/css/ionos/notes.css
+++ b/apps/theming/css/ionos/notes.css
@@ -7,12 +7,5 @@ div.suggestion-list {
 		&.is-selected {
 			background-color: var(--ion-context-menu-item-background-active);
 		}
-
-		img {
-			filter: none;
-			@media (prefers-color-scheme: dark) {
-				filter: invert(100%);
-			}
-		}
 	}
 }
diff --git a/apps/theming/css/ionos/profile.css b/apps/theming/css/ionos/profile.css
index b3930e94a4c8b..0d7f2ad66d1d3 100644
--- a/apps/theming/css/ionos/profile.css
+++ b/apps/theming/css/ionos/profile.css
@@ -1,9 +1,6 @@
 .app-profile.content {
 	.user-actions__other.action-items img {
-		filter: none;
-		@media (prefers-color-scheme: dark) {
-			filter: invert(100%);
-		}
+
 
 	}
 }
diff --git a/apps/theming/css/ionos/sidebar.css b/apps/theming/css/ionos/sidebar.css
index 31b2fd852edcd..862e88d0adacb 100644
--- a/apps/theming/css/ionos/sidebar.css
+++ b/apps/theming/css/ionos/sidebar.css
@@ -45,23 +45,11 @@ div.app-navigation, div#app-navigation {
 				.app-navigation-entry-link {
 					color: var(--ion-button-sidebar-text) !important;
 				}
-				img {
-					filter: none;
-				}
-				@media (prefers-color-scheme: dark) {
-					img {
-						filter: invert(100%);
-					}
-				}
 			}
 			&:hover {
 				background-color: var(--ion-button-sidebar-background-hover);
 			}
-			@media (prefers-color-scheme: dark) {
-				img {
-					filter: invert(100%);
-				}
-			}
+
 		}
 
 		.app-navigation-entry--opened:has(.app-navigation-entry__children) {
diff --git a/apps/theming/css/ionos/variables.css b/apps/theming/css/ionos/variables.css
index 903b067f43e79..696c765232d2f 100644
--- a/apps/theming/css/ionos/variables.css
+++ b/apps/theming/css/ionos/variables.css
@@ -1,4 +1,22 @@
 & {
+	/* Background inversion for light/dark mode */
+	--background-invert-if-dark: no;
+	--background-invert-if-bright: invert(100%);
+	--background-image-invert-if-bright: no;
+	/* Primary color inversion for light/dark mode */
+	--primary-invert-if-bright: no;
+	--primary-invert-if-dark: invert(100%);
+
+	@media (prefers-color-scheme: dark) {
+		--background-invert-if-dark: invert(100%);
+		--background-invert-if-bright: no;
+		--background-image-invert-if-bright: invert(100%);
+
+		--primary-invert-if-bright: invert(100%);
+		--primary-invert-if-dark: no;
+	}
+
+
 	/* Text colors */
 	--ion-text: light-dark(var(--ion-color-secondary), var(--ion-color-cool-grey-c1));
 	--ion-text-bright: var(--ion-color-cool-grey-c7);
diff --git a/apps/theming/lib/Themes/IonosTheme.php b/apps/theming/lib/Themes/IonosTheme.php
index 00f29a57d5a1b..9b5fbc490a99d 100644
--- a/apps/theming/lib/Themes/IonosTheme.php
+++ b/apps/theming/lib/Themes/IonosTheme.php
@@ -135,6 +135,14 @@ private function generateSingleFontFace(string $fileVariant, string $weight): st
 
 	public function getCSSVariables(): array {
 		$defaultVariables = parent::getCSSVariables();
+
+		// Remove background invert variables from parent
+		unset(
+			$defaultVariables['--background-invert-if-dark'],
+			$defaultVariables['--background-invert-if-bright'],
+			$defaultVariables['--background-image-invert-if-bright']
+		);
+
 		$originalFontFace = $defaultVariables['--font-face'];
 
 		// IONOS COLORS