diff --git a/packages/frontend/@n8n/design-system/package.json b/packages/frontend/@n8n/design-system/package.json
index 2e139f205fa..eff52e7bbc4 100644
--- a/packages/frontend/@n8n/design-system/package.json
+++ b/packages/frontend/@n8n/design-system/package.json
@@ -3,7 +3,6 @@
   "name": "@n8n/design-system",
   "version": "2.32.0",
   "main": "src/index.ts",
-  "import": "src/index.ts",
   "scripts": {
     "dev": "pnpm run --dir=../storybook dev",
     "clean": "rimraf dist .turbo",
@@ -46,6 +45,7 @@
     "autoprefixer": "^10.4.19",
     "emojibase-data": "^17.0.0",
     "eslint-plugin-storybook": "catalog:storybook",
+    "pinia": "catalog:frontend",
     "postcss": "^8.4.38",
     "sass": "^1.71.1",
     "storybook": "catalog:storybook",
@@ -90,7 +90,6 @@
     "markdown-it-link-attributes": "catalog:",
     "markdown-it-task-lists": "^2.1.1",
     "parse-diff": "^0.11.1",
-    "pinia": "catalog:frontend",
     "reka-ui": "^2.5.0",
     "sanitize-html": "catalog:",
     "vue": "catalog:frontend",
diff --git a/packages/frontend/@n8n/design-system/src/components/N8nButton/Button.legacy.scss b/packages/frontend/@n8n/design-system/src/components/N8nButton/Button.legacy.scss
index 146f13ad5fa..b6eb68baed5 100644
--- a/packages/frontend/@n8n/design-system/src/components/N8nButton/Button.legacy.scss
+++ b/packages/frontend/@n8n/design-system/src/components/N8nButton/Button.legacy.scss
@@ -11,10 +11,15 @@
  * Usage:
  *   <N8nButton variant="solid" class="n8n-button--success">Save</N8nButton>
  *   <N8nButton variant="ghost" class="n8n-button--highlight">Info</N8nButton>
+ *
+ * Do not wrap these selectors in `:global()`. This file is `@use`d from
+ * Button.vue's plain (non-module) style block, where selectors are already
+ * global, so `:global()` is never transformed away — it ships as an invalid
+ * pseudo-class and browsers drop the whole rule.
  */
 
 /** @deprecated Use a semantic variant instead of success color */
-:global(.n8n-button--success) {
+.n8n-button--success {
 	--button--color--background: var(--color--success);
 	--button--color--background-hover: var(--color--success--shade-1);
 	--button--color--background-active: var(--color--success--shade-1);
@@ -31,7 +36,7 @@
 }
 
 /** @deprecated Use a semantic variant instead of warning color */
-:global(.n8n-button--warning) {
+.n8n-button--warning {
 	--button--color--background: var(--color--warning);
 	--button--color--background-hover: var(--color--warning--shade-1);
 	--button--color--background-active: var(--color--warning--shade-1);
diff --git a/packages/frontend/@n8n/design-system/src/components/index.ts b/packages/frontend/@n8n/design-system/src/components/index.ts
index e7e2c0305a4..3702cd7189a 100644
--- a/packages/frontend/@n8n/design-system/src/components/index.ts
+++ b/packages/frontend/@n8n/design-system/src/components/index.ts
@@ -111,6 +111,7 @@ export { default as N8nResizeWrapper } from './N8nResizeWrapper';
 export { default as N8nSelect } from './N8nSelect';
 export { default as N8nSpinner } from './N8nSpinner';
 export { default as N8nStatusDot } from './N8nStatusDot';
+export { default as N8nStepper } from './N8nStepper/Stepper.vue';
 export { default as N8nSticky } from './N8nSticky';
 export { default as N8nResizeableSticky } from './N8nResizeableSticky';
 export { default as N8nSuggestedActions } from './N8nSuggestedActions';
diff --git a/packages/frontend/@n8n/design-system/src/css/globalSelectorPlacement.test.ts b/packages/frontend/@n8n/design-system/src/css/globalSelectorPlacement.test.ts
new file mode 100644
index 00000000000..c7157110c5e
--- /dev/null
+++ b/packages/frontend/@n8n/design-system/src/css/globalSelectorPlacement.test.ts
@@ -0,0 +1,55 @@
+import { readdirSync, readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+/**
+ * `:global()` is a CSS-Modules construct. It is only transformed away in a
+ * `<style module>` or `<style scoped>` block; anywhere else it survives into
+ * the emitted CSS as an invalid pseudo-class, which browsers respond to by
+ * dropping the whole rule (and lightningcss by warning). A standalone `.scss`
+ * can't know which kind of block will `@use` it, so it must not use `:global()`
+ * at all — the caller decides, and getting it wrong fails silently.
+ */
+
+const srcDir = resolve(process.cwd(), 'src');
+const styleBlock = /<style\b([^>]*)>([\s\S]*?)<\/style>/g;
+
+/** Only selectors matter here, so comments explaining this very rule shouldn't trip it. */
+const usesGlobal = (source: string) =>
+	source
+		.replace(/\/\*[\s\S]*?\*\//g, '')
+		.replace(/(^|\s)\/\/.*$/gm, '$1')
+		.includes(':global(');
+
+const allFiles = readdirSync(srcDir, { recursive: true, encoding: 'utf8' });
+
+const collect = (extension: string) => {
+	const files = allFiles.filter((file) => file.endsWith(extension));
+	// A wrong srcDir would make the assertions below vacuously pass.
+	expect(files.length).toBeGreaterThan(0);
+	return files.map((file) => [file, readFileSync(resolve(srcDir, file), 'utf8')] as const);
+};
+
+describe(':global() placement', () => {
+	it('is not used in .vue style blocks that do not transform it', () => {
+		const offenders: string[] = [];
+
+		for (const [file, source] of collect('.vue')) {
+			for (const [, attrs, body] of source.matchAll(styleBlock)) {
+				const transformed = /\bmodule\b/.test(attrs) || /\bscoped\b/.test(attrs);
+				if (!transformed && usesGlobal(body)) {
+					offenders.push(`${file} — <style${attrs}>`);
+				}
+			}
+		}
+
+		expect(offenders).toEqual([]);
+	});
+
+	it('is not used in standalone .scss files', () => {
+		const offenders = collect('.scss')
+			.filter(([, source]) => usesGlobal(source))
+			.map(([file]) => file);
+
+		expect(offenders).toEqual([]);
+	});
+});
diff --git a/packages/frontend/editor-ui/src/features/agents/components/AgentChannelLinearSetup.vue b/packages/frontend/editor-ui/src/features/agents/components/AgentChannelLinearSetup.vue
index efb42e9b702..8393b2d9167 100644
--- a/packages/frontend/editor-ui/src/features/agents/components/AgentChannelLinearSetup.vue
+++ b/packages/frontend/editor-ui/src/features/agents/components/AgentChannelLinearSetup.vue
@@ -1,7 +1,6 @@
 <script setup lang="ts">
 import { computed, ref, shallowRef } from 'vue';
-import { N8nButton, N8nIconButton, N8nInput, N8nText } from '@n8n/design-system';
-import N8nStepper from '@n8n/design-system/components/N8nStepper/Stepper.vue';
+import { N8nButton, N8nIconButton, N8nInput, N8nStepper, N8nText } from '@n8n/design-system';
 import type { ChatIntegrationDescriptor, AgentIntegrationSettings } from '@n8n/api-types';
 import { useI18n } from '@n8n/i18n';
 import { useRootStore } from '@n8n/stores/useRootStore';
diff --git a/packages/frontend/editor-ui/src/features/agents/components/AgentChannelSlackSetup.vue b/packages/frontend/editor-ui/src/features/agents/components/AgentChannelSlackSetup.vue
index f2406270657..02f17e28388 100644
--- a/packages/frontend/editor-ui/src/features/agents/components/AgentChannelSlackSetup.vue
+++ b/packages/frontend/editor-ui/src/features/agents/components/AgentChannelSlackSetup.vue
@@ -6,9 +6,9 @@ import {
 	N8nIcon,
 	N8nIconButton,
 	N8nInput,
+	N8nStepper,
 	N8nText,
 } from '@n8n/design-system';
-import N8nStepper from '@n8n/design-system/components/N8nStepper/Stepper.vue';
 import AgentChannelSlackSetupSnapshots from './AgentChannelSlackSetupSnapshots.vue';
 import { useI18n } from '@n8n/i18n';
 import { useRootStore } from '@n8n/stores/useRootStore';
diff --git a/packages/frontend/editor-ui/src/features/agents/components/AgentChannelTelegramSetup.vue b/packages/frontend/editor-ui/src/features/agents/components/AgentChannelTelegramSetup.vue
index 77b72bf76aa..0c0ec88e8f7 100644
--- a/packages/frontend/editor-ui/src/features/agents/components/AgentChannelTelegramSetup.vue
+++ b/packages/frontend/editor-ui/src/features/agents/components/AgentChannelTelegramSetup.vue
@@ -1,7 +1,6 @@
 <script setup lang="ts">
 import { computed, ref } from 'vue';
-import { N8nButton, N8nText } from '@n8n/design-system';
-import N8nStepper from '@n8n/design-system/components/N8nStepper/Stepper.vue';
+import { N8nButton, N8nStepper, N8nText } from '@n8n/design-system';
 import type { ChatIntegrationDescriptor, AgentIntegrationSettings } from '@n8n/api-types';
 import { useI18n } from '@n8n/i18n';
 import type { PermissionsRecord } from '@n8n/permissions';
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 08687c4652d..505ac414726 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -5181,9 +5181,6 @@ importers:
       parse-diff:
         specifier: ^0.11.1
         version: 0.11.1
-      pinia:
-        specifier: catalog:frontend
-        version: 2.2.4(typescript@6.0.2)(vue@3.5.26(typescript@6.0.2))
       reka-ui:
         specifier: ^2.5.0
         version: 2.5.0(typescript@6.0.2)(vue@3.5.26(typescript@6.0.2))
@@ -5272,6 +5269,9 @@ importers:
       eslint-plugin-storybook:
         specifier: catalog:storybook
         version: 10.1.11(eslint@9.29.0(jiti@2.6.1))(storybook@10.1.11(@testing-library/dom@10.4.0)(bufferutil@4.0.9)(prettier@3.6.2)(react-dom@18.2.0(react@18.2.0))(react@18.2.0)(utf-8-validate@5.0.10))(typescript@6.0.2)
+      pinia:
+        specifier: catalog:frontend
+        version: 2.2.4(typescript@6.0.2)(vue@3.5.26(typescript@6.0.2))
       postcss:
         specifier: 8.5.10
         version: 8.5.10