diff --git a/apps/desktop/src/App.vue b/apps/desktop/src/App.vue
index a826a272d6..ddb200a6d4 100644
--- a/apps/desktop/src/App.vue
+++ b/apps/desktop/src/App.vue
@@ -4498,7 +4498,7 @@ onUnmounted(() => {
           @animationend="finishSqlLibraryFlyAnimation(sqlLibraryFlyAnimation.id)"
         />
         <Transition name="toast">
-          <div v-if="toastVisible" class="fixed bottom-6 inset-x-0 mx-auto z-99999 w-max max-w-[90vw] sm:max-w-3xl px-4 py-2 rounded-lg bg-foreground text-background text-sm shadow-lg select-text whitespace-pre-wrap break-words">
+          <div v-if="toastVisible" class="fixed bottom-6 inset-x-0 mx-auto z-99999 w-max max-w-[90vw] sm:max-w-3xl px-4 py-2 rounded-lg bg-foreground text-background-solid text-sm shadow-lg select-text whitespace-pre-wrap break-words">
             <span>{{ toastMessage }}</span>
             <button v-if="toastAction" type="button" class="ml-3 shrink-0 rounded border border-background/40 bg-background/10 px-2 py-0.5 text-xs font-medium hover:bg-background/20" @click="toastAction.onClick()">
               {{ toastAction.label }}
diff --git a/apps/desktop/src/components/connection/ConnectionDialog.vue b/apps/desktop/src/components/connection/ConnectionDialog.vue
index f1decc5dd6..fb5874c614 100644
--- a/apps/desktop/src/components/connection/ConnectionDialog.vue
+++ b/apps/desktop/src/components/connection/ConnectionDialog.vue
@@ -6901,7 +6901,7 @@ function openExternalUrl(url: string) {
                                 <span>{{ t(option.labelKey) }}</span>
                                 <Badge v-if="option.recommended" class="h-4 rounded-full px-1.5 text-[10px] leading-none">{{ t("connection.sqliteWorkerPlacementDefault") }}</Badge>
                               </div>
-                              <p class="text-[11px] leading-relaxed text-background/80">{{ t(option.hintKey) }}</p>
+                              <p class="text-[11px] leading-relaxed text-background-solid/80">{{ t(option.hintKey) }}</p>
                             </TooltipContent>
                           </Tooltip>
                         </div>
diff --git a/apps/desktop/src/components/editor/AiAssistant.vue b/apps/desktop/src/components/editor/AiAssistant.vue
index c03e03af30..680daf9d8e 100644
--- a/apps/desktop/src/components/editor/AiAssistant.vue
+++ b/apps/desktop/src/components/editor/AiAssistant.vue
@@ -5985,11 +5985,11 @@ async function openExternalUrl(url: string) {
             <button v-if="isGenerating" class="h-7 w-7 shrink-0 rounded-full bg-destructive text-destructive-foreground flex items-center justify-center" :title="t('ai.stopGenerating')" @click="cancelStream">
               <Square class="h-3.5 w-3.5" />
             </button>
-            <button v-else-if="hasActiveRunForCurrentConversation" class="h-7 shrink-0 items-center gap-1 rounded-full bg-foreground px-2.5 text-[11px] font-medium text-background disabled:opacity-30 flex" :disabled="!canSubmitPrompt" :title="t('ai.queueSendHint')" @click="onSendClick">
+            <button v-else-if="hasActiveRunForCurrentConversation" class="h-7 shrink-0 items-center gap-1 rounded-full bg-foreground px-2.5 text-[11px] font-medium text-background-solid disabled:opacity-30 flex" :disabled="!canSubmitPrompt" :title="t('ai.queueSendHint')" @click="onSendClick">
               <Hourglass class="h-3.5 w-3.5" />
               <span>{{ t("ai.queueSend") }}</span>
             </button>
-            <button v-else class="h-7 w-7 shrink-0 rounded-full bg-foreground text-background flex items-center justify-center disabled:opacity-30" :disabled="!canSubmitPrompt" @click="send">
+            <button v-else class="h-7 w-7 shrink-0 rounded-full bg-foreground text-background-solid flex items-center justify-center disabled:opacity-30" :disabled="!canSubmitPrompt" @click="send">
               <ArrowUp class="h-4 w-4" />
             </button>
           </div>
diff --git a/apps/desktop/src/components/grid/DataGridColumnHeader.vue b/apps/desktop/src/components/grid/DataGridColumnHeader.vue
index 3d556ff871..5d2ec4761a 100644
--- a/apps/desktop/src/components/grid/DataGridColumnHeader.vue
+++ b/apps/desktop/src/components/grid/DataGridColumnHeader.vue
@@ -88,7 +88,7 @@ const emit = defineEmits<{
         </span>
         <template #content>
           <div class="dbx-column-info-tooltip grid min-w-56 grid-cols-[auto_minmax(0,1fr)] gap-x-2 gap-y-1 px-3 py-2">
-            <span class="text-background/70">{{ columnNameLabel }}</span>
+            <span class="text-background-solid/70">{{ columnNameLabel }}</span>
             <span class="flex min-w-0 items-center gap-2">
               <span class="min-w-0 flex-1 truncate font-mono">{{ name }}</span>
               <button data-column-header-copy-name type="button" class="flex h-5 w-5 shrink-0 items-center justify-center rounded hover:bg-background/10" :title="copyColumnNameLabel" @click.stop="emit('copyName')">
@@ -96,19 +96,19 @@ const emit = defineEmits<{
               </button>
             </span>
             <template v-if="tooltipColumnType ?? columnType">
-              <span class="text-background/70">{{ columnTypeLabel }}</span>
+              <span class="text-background-solid/70">{{ columnTypeLabel }}</span>
               <span :class="typeClass">{{ tooltipColumnType ?? columnType }}</span>
             </template>
             <template v-if="tooltipColumnComment ?? columnComment">
-              <span class="text-background/70">{{ columnCommentLabel }}</span>
+              <span class="text-background-solid/70">{{ columnCommentLabel }}</span>
               <span>{{ tooltipColumnComment ?? columnComment }}</span>
             </template>
             <template v-if="columnNullability">
-              <span class="text-background/70">{{ nullableLabel }}</span>
+              <span class="text-background-solid/70">{{ nullableLabel }}</span>
               <span>{{ columnNullability === "nullable" ? yesLabel : noLabel }}</span>
             </template>
             <template v-if="columnIndexKind && columnIndexKind !== 'none'">
-              <span class="text-background/70">{{ columnIndexLabel }}</span>
+              <span class="text-background-solid/70">{{ columnIndexLabel }}</span>
               <span class="flex items-center gap-1">
                 <KeyRound v-if="columnIndexKind === 'primary'" class="h-3 w-3" :class="columnIndexColorClass(columnIndexKind)" />
                 <Hash v-else class="h-3 w-3" :class="columnIndexColorClass(columnIndexKind)" />
diff --git a/apps/desktop/src/components/grid/DataGridConditionEditor.vue b/apps/desktop/src/components/grid/DataGridConditionEditor.vue
index a175adb8ec..080e67ae81 100644
--- a/apps/desktop/src/components/grid/DataGridConditionEditor.vue
+++ b/apps/desktop/src/components/grid/DataGridConditionEditor.vue
@@ -702,7 +702,7 @@ defineExpose({ focus, dismiss: editor.dismiss, rememberHistory: editor.rememberH
     <Teleport to="body">
       <div v-if="historyPreview" class="pointer-events-none fixed z-[140] rounded-md bg-foreground shadow-xl" :style="previewStyle">
         <span class="absolute h-3 w-3 rotate-45 bg-foreground" :class="historyPreview.side === 'left' ? '-left-1.5' : '-right-1.5'" :style="previewArrowStyle" />
-        <div class="max-h-[min(320px,calc(100vh-16px))] overflow-auto rounded-md px-3 py-2 font-mono text-xs leading-relaxed whitespace-pre-wrap break-words text-background">{{ historyPreview.value }}</div>
+        <div class="max-h-[min(320px,calc(100vh-16px))] overflow-auto rounded-md px-3 py-2 font-mono text-xs leading-relaxed whitespace-pre-wrap break-words text-background-solid">{{ historyPreview.value }}</div>
       </div>
     </Teleport>
   </div>
diff --git a/apps/desktop/src/components/nacos/NacosAdminConsole.vue b/apps/desktop/src/components/nacos/NacosAdminConsole.vue
index 45ee40cbe7..1b0054a9b7 100644
--- a/apps/desktop/src/components/nacos/NacosAdminConsole.vue
+++ b/apps/desktop/src/components/nacos/NacosAdminConsole.vue
@@ -3069,7 +3069,7 @@ useUpdateBlocker(() =>
                     :key="format"
                     type="button"
                     class="shrink-0 rounded border px-2 py-0.5 text-[11px] font-medium transition-colors"
-                    :class="configType === format ? 'border-foreground/80 bg-foreground text-background' : 'border-transparent text-muted-foreground hover:border-border hover:bg-background hover:text-foreground'"
+                    :class="configType === format ? 'border-foreground/80 bg-foreground text-background-solid' : 'border-transparent text-muted-foreground hover:border-border hover:bg-background hover:text-foreground'"
                     :disabled="readOnly"
                     :aria-pressed="configType === format"
                     @click="setConfigFormat(format)"
diff --git a/apps/desktop/src/components/ui/LightTooltip.vue b/apps/desktop/src/components/ui/LightTooltip.vue
index 83f03c0ef9..6cf14f12d1 100644
--- a/apps/desktop/src/components/ui/LightTooltip.vue
+++ b/apps/desktop/src/components/ui/LightTooltip.vue
@@ -79,7 +79,7 @@ const arrowClass = computed(() => {
   }
 });
 
-const tooltipSurfaceClass = computed(() => (props.surface === "popover" ? "bg-popover text-popover-foreground" : "bg-foreground text-background"));
+const tooltipSurfaceClass = computed(() => (props.surface === "popover" ? "bg-popover text-popover-foreground" : "bg-foreground text-background-solid"));
 
 const arrowSurfaceClass = computed(() => (props.surface === "popover" ? "bg-popover border-border" : "bg-foreground border-foreground"));
 
diff --git a/apps/desktop/src/components/ui/tooltip/TooltipContent.vue b/apps/desktop/src/components/ui/tooltip/TooltipContent.vue
index 74725676f9..a23ad32f40 100644
--- a/apps/desktop/src/components/ui/tooltip/TooltipContent.vue
+++ b/apps/desktop/src/components/ui/tooltip/TooltipContent.vue
@@ -26,7 +26,7 @@ const forwarded = useForwardPropsEmits(delegatedProps, emits);
       v-bind="{ ...forwarded, ...$attrs }"
       :class="
         cn(
-          'data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-[state=delayed-open]:animate-in data-[state=delayed-open]:fade-in-0 data-[state=delayed-open]:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 inline-flex items-center gap-1.5 rounded-md px-3 py-1.5 text-xs has-data-[slot=kbd]:pr-1.5 **:data-[slot=kbd]:relative **:data-[slot=kbd]:isolate **:data-[slot=kbd]:z-50 **:data-[slot=kbd]:rounded-sm bg-foreground text-background z-50 w-fit max-w-xs origin-(--reka-tooltip-content-transform-origin)',
+          'data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-[state=delayed-open]:animate-in data-[state=delayed-open]:fade-in-0 data-[state=delayed-open]:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 inline-flex items-center gap-1.5 rounded-md px-3 py-1.5 text-xs has-data-[slot=kbd]:pr-1.5 **:data-[slot=kbd]:relative **:data-[slot=kbd]:isolate **:data-[slot=kbd]:z-50 **:data-[slot=kbd]:rounded-sm bg-foreground text-background-solid z-50 w-fit max-w-xs origin-(--reka-tooltip-content-transform-origin)',
           props.class,
         )
       "
diff --git a/apps/desktop/src/composables/__tests__/useBackgroundImage.spec.ts b/apps/desktop/src/composables/__tests__/useBackgroundImage.spec.ts
index 53465c204b..cf060e2da2 100644
--- a/apps/desktop/src/composables/__tests__/useBackgroundImage.spec.ts
+++ b/apps/desktop/src/composables/__tests__/useBackgroundImage.spec.ts
@@ -86,6 +86,45 @@ describe("useBackgroundImage", () => {
     }
   });
 
+  it("keeps an opaque companion for inverted text while the surfaces turn translucent", async () => {
+    const theme = useTheme();
+    const originalMode = theme.themeMode.value;
+    const originalPalette = theme.themePalette.value;
+    const originalColors = { ...theme.customUiColors.value };
+    theme.setThemeMode("light");
+    theme.setCustomUiColors({ ...originalColors, background: "#123456" });
+    theme.setThemePalette("custom");
+    const createObjectURL = vi.fn(() => "blob:bg-solid");
+    Object.defineProperty(URL, "createObjectURL", { value: createObjectURL, configurable: true, writable: true });
+    readBackgroundImageMock.mockResolvedValue("aGVsbG8=");
+    try {
+      const settings = settingsWith({ filePath: "/data/background-image.png", opacity: 0.3 });
+      const bg = useBackgroundImage(settings);
+      await vi.waitFor(() => expect(bg.active.value).toBe(true));
+      await vi.waitFor(() => {
+        // The surface itself goes translucent so the wallpaper shows through...
+        expect(document.documentElement.style.getPropertyValue("--background")).toBe("rgb(18 52 86 / 0.3)");
+        // ...but the color used as text on `bg-foreground` widgets stays opaque,
+        // otherwise tooltip/toast glyphs wash out (#8678).
+        expect(document.documentElement.style.getPropertyValue("--background-solid")).toBe("rgb(18 52 86)");
+      });
+      // No other surface grows a companion: only the inverted-text vars do.
+      expect(document.documentElement.style.getPropertyValue("--sidebar-solid")).toBe("");
+
+      settings.editorSettings.backgroundImage = { ...defaultBackgroundImageSettings() };
+      await vi.waitFor(() => expect(bg.active.value).toBe(false));
+      await vi.waitFor(() => {
+        expect(document.documentElement.style.getPropertyValue("--background-solid")).toBe("");
+      });
+      // Inactive: the custom palette's own inline value is restored untouched.
+      expect(document.documentElement.style.getPropertyValue("--background")).toBe("rgb(18 52 86)");
+    } finally {
+      theme.setCustomUiColors(originalColors);
+      theme.setThemeMode(originalMode);
+      theme.setThemePalette(originalPalette);
+    }
+  });
+
   it("re-emits custom palette inline surface colors when the wallpaper is inactive", async () => {
     const theme = useTheme();
     const originalMode = theme.themeMode.value;
diff --git a/apps/desktop/src/composables/useBackgroundImage.ts b/apps/desktop/src/composables/useBackgroundImage.ts
index c2f55bbb85..100ce847b7 100644
--- a/apps/desktop/src/composables/useBackgroundImage.ts
+++ b/apps/desktop/src/composables/useBackgroundImage.ts
@@ -1,5 +1,5 @@
 import { computed, ref, watch, watchPostEffect, type ComputedRef, type Ref } from "vue";
-import { BACKGROUND_IMAGE_SURFACE_VARS, backgroundImageStyle, backgroundImageSurfaceAlpha, surfaceColorWithAlpha, type BackgroundImageSettings } from "@/lib/app/appBackgroundImage";
+import { BACKGROUND_IMAGE_INVERTED_TEXT_VARS, BACKGROUND_IMAGE_SURFACE_VARS, backgroundImageSolidVarName, backgroundImageStyle, backgroundImageSurfaceAlpha, surfaceColorWithAlpha, type BackgroundImageSettings } from "@/lib/app/appBackgroundImage";
 import { APP_CUSTOM_UI_COLOR_DEFS, appCustomUiColorValue, deriveCustomUiColors } from "@/lib/app/appTheme";
 import { readBackgroundImage } from "@/lib/backend/api";
 import { useTheme } from "@/composables/useTheme";
@@ -112,7 +112,7 @@ export function useBackgroundImage(settingsStore: SettingsStoreLike): Background
     const alpha = backgroundImageSurfaceAlpha(backgroundSettings.value);
     const isActive = active.value;
     const customBase = customSurfaceBaseColors();
-    for (const varName of BACKGROUND_IMAGE_SURFACE_VARS) {
+    for (const varName of [...BACKGROUND_IMAGE_SURFACE_VARS, ...BACKGROUND_IMAGE_INVERTED_TEXT_VARS.map(backgroundImageSolidVarName)]) {
       doc.style.removeProperty(varName);
     }
     doc.classList.toggle(BACKGROUND_IMAGE_ACTIVE_CLASS, isActive);
@@ -125,10 +125,16 @@ export function useBackgroundImage(settingsStore: SettingsStoreLike): Background
     }
     const computedStyle = getComputedStyle(doc);
     for (const varName of BACKGROUND_IMAGE_SURFACE_VARS) {
-      const base = customBase.get(varName) ?? computedStyle.getPropertyValue(varName);
+      const base = (customBase.get(varName) ?? computedStyle.getPropertyValue(varName)).trim();
       const tinted = surfaceColorWithAlpha(base, alpha);
       if (tinted) doc.style.setProperty(varName, tinted);
     }
+    // Inverted-text surfaces (`bg-foreground text-background`) keep the opaque
+    // palette color: their glyphs must not inherit the wallpaper alpha.
+    for (const varName of BACKGROUND_IMAGE_INVERTED_TEXT_VARS) {
+      const base = (customBase.get(varName) ?? computedStyle.getPropertyValue(varName)).trim();
+      if (base) doc.style.setProperty(backgroundImageSolidVarName(varName), base);
+    }
   });
 
   return {
diff --git a/apps/desktop/src/lib/app/__tests__/appBackgroundImage.spec.ts b/apps/desktop/src/lib/app/__tests__/appBackgroundImage.spec.ts
index 6d9aab479e..683d3264d1 100644
--- a/apps/desktop/src/lib/app/__tests__/appBackgroundImage.spec.ts
+++ b/apps/desktop/src/lib/app/__tests__/appBackgroundImage.spec.ts
@@ -1,9 +1,11 @@
 import { describe, expect, it } from "vitest";
 import {
   BACKGROUND_IMAGE_FILE_EXTENSIONS,
+  BACKGROUND_IMAGE_INVERTED_TEXT_VARS,
   BACKGROUND_IMAGE_STORAGE_LIMIT_BYTES,
   BACKGROUND_IMAGE_SURFACE_VARS,
   backgroundImageFileExtension,
+  backgroundImageSolidVarName,
   backgroundImageStyle,
   backgroundImageSurfaceAlpha,
   defaultBackgroundImageSettings,
@@ -149,6 +151,16 @@ describe("surfaceColorWithAlpha", () => {
   });
 });
 
+describe("inverted-text surface vars", () => {
+  it("only marks surface vars that turn translucent, and names their opaque companion", () => {
+    for (const varName of BACKGROUND_IMAGE_INVERTED_TEXT_VARS) {
+      expect(BACKGROUND_IMAGE_SURFACE_VARS).toContain(varName);
+      expect(backgroundImageSolidVarName(varName)).toBe(`${varName}-solid`);
+    }
+    expect(BACKGROUND_IMAGE_INVERTED_TEXT_VARS).toContain("--background");
+  });
+});
+
 describe("BACKGROUND_IMAGE_STORAGE_LIMIT_BYTES", () => {
   it("is 20 MB", () => {
     expect(BACKGROUND_IMAGE_STORAGE_LIMIT_BYTES).toBe(20 * 1024 * 1024);
diff --git a/apps/desktop/src/lib/app/appBackgroundImage.ts b/apps/desktop/src/lib/app/appBackgroundImage.ts
index 35e093d281..6417bb5a3b 100644
--- a/apps/desktop/src/lib/app/appBackgroundImage.ts
+++ b/apps/desktop/src/lib/app/appBackgroundImage.ts
@@ -113,6 +113,25 @@ export function backgroundImageStyle(settings: Pick<BackgroundImageSettings, "di
  */
 export const BACKGROUND_IMAGE_SURFACE_VARS = ["--background", "--sidebar", "--muted", "--secondary", "--accent", "--dbx-chrome", "--dbx-chrome-muted", "--dbx-content", "--dbx-editor-toolbar", "--dbx-gutter", "--dbx-sidebar-header"] as const;
 
+/**
+ * Surface variables that are also consumed as *foreground* colors, and
+ * therefore need an opaque companion while the surface itself turns
+ * translucent.
+ *
+ * `--background` backs `text-background`, the inverted text painted on
+ * `bg-foreground` widgets (tooltips, toasts, grid chips). Tinting it for the
+ * wallpaper also tints those glyphs, so a toolbar tooltip ends up with washed
+ * out gray text on its own opaque bubble — reported as "the popup background
+ * and the text color merged" in #8678. Consumers of the inverted text read
+ * `text-background-solid` (tokens.css) instead.
+ */
+export const BACKGROUND_IMAGE_INVERTED_TEXT_VARS = ["--background"] as const;
+
+/** Opaque companion variable published for an inverted-text surface var. */
+export function backgroundImageSolidVarName(varName: string): string {
+  return `${varName}-solid`;
+}
+
 /** Alpha for the surface variables derived from the surface-opacity setting. */
 export function backgroundImageSurfaceAlpha(settings: Pick<BackgroundImageSettings, "opacity">): number {
   return clampNumber(settings.opacity, BACKGROUND_IMAGE_MIN_OPACITY, BACKGROUND_IMAGE_MAX_OPACITY, BACKGROUND_IMAGE_DEFAULT_OPACITY);
diff --git a/apps/desktop/src/styles/tokens.css b/apps/desktop/src/styles/tokens.css
index c98f202198..83f91edb55 100644
--- a/apps/desktop/src/styles/tokens.css
+++ b/apps/desktop/src/styles/tokens.css
@@ -94,6 +94,10 @@
   --color-card: var(--card);
   --color-foreground: var(--foreground);
   --color-background: var(--background);
+  /* Opaque background for inverted text (`bg-foreground text-background-solid`).
+     useBackgroundImage publishes `--background-solid` while a wallpaper is active,
+     so tooltips/toasts keep readable glyphs when the surfaces turn translucent. */
+  --color-background-solid: var(--background-solid, var(--background));
   --radius-sm: var(--dbx-radius-sm);
   --radius-md: var(--dbx-radius-md);
   --radius-lg: var(--dbx-radius-lg);
diff --git a/docs/screenshots/issue-8678-tooltip-wallpaper-after.png b/docs/screenshots/issue-8678-tooltip-wallpaper-after.png
new file mode 100644
index 0000000000..335a360d29
Binary files /dev/null and b/docs/screenshots/issue-8678-tooltip-wallpaper-after.png differ
diff --git a/docs/screenshots/issue-8678-tooltip-wallpaper-before.png b/docs/screenshots/issue-8678-tooltip-wallpaper-before.png
new file mode 100644
index 0000000000..694f0278f4
Binary files /dev/null and b/docs/screenshots/issue-8678-tooltip-wallpaper-before.png differ
diff --git a/docs/screenshots/issue-8678-wallpaper-dark-after.png b/docs/screenshots/issue-8678-wallpaper-dark-after.png
new file mode 100644
index 0000000000..98bd898ea7
Binary files /dev/null and b/docs/screenshots/issue-8678-wallpaper-dark-after.png differ