diff --git a/playwright/diagnostics.spec.ts b/playwright/diagnostics.spec.ts
index 3d30005..567d33b 100644
--- a/playwright/diagnostics.spec.ts
+++ b/playwright/diagnostics.spec.ts
@@ -442,6 +442,35 @@ test('sass compiler warnings surface in styles diagnostics', async ({ page }) =>
   )
 })
 
+test('css modules nesting compiles without lightning wasm compatibility errors', async ({
+  page,
+}) => {
+  await waitForInitialRender(page)
+
+  await ensurePanelToolsVisible(page, 'styles')
+  await page.getByRole('combobox', { name: 'Style mode' }).selectOption('module')
+  await setStylesEditorSource(
+    page,
+    ['.btn {', '  &:hover {', '    color: red;', '  }', '}'].join('\n'),
+  )
+
+  await expect
+    .poll(async () => {
+      return (
+        await page.getByRole('status', { name: 'App status' }).textContent()
+      )?.trim()
+    })
+    .toBe('Rendered')
+
+  await ensureDiagnosticsDrawerOpen(page)
+  await expect(page.locator('#diagnostics-styles')).not.toContainText(
+    'Style compilation failed.',
+  )
+  await expect(page.locator('#diagnostics-styles')).not.toContainText(
+    'invalid type: unit value, expected a boolean',
+  )
+})
+
 test('clear component diagnostics resets rendered lint-issue status pill', async ({
   page,
 }) => {
diff --git a/src/modules/cdn.js b/src/modules/cdn.js
index 4474d67..e4e606b 100644
--- a/src/modules/cdn.js
+++ b/src/modules/cdn.js
@@ -45,24 +45,25 @@ const fallbackCdnProviders = fallbackCdnProvidersByPrimary[primaryCdnProvider] ?
 
 export const cdnImportSpecs = {
   cssBrowser: {
-    importMap: '@knighted/css/browser',
-    esm: '@knighted/css/browser',
-    jspmGa: 'npm:@knighted/css/browser',
+    importMap: '@knighted/css@1.2.1/browser',
+    esm: '@knighted/css@1.2.1/browser',
+    unpkg: '@knighted/css@1.2.1/dist/browser.js?module',
+    jspmGa: 'npm:@knighted/css@1.2.1/browser',
   },
   jsxDom: {
-    importMap: '@knighted/jsx',
-    esm: '@knighted/jsx',
-    jspmGa: 'npm:@knighted/jsx',
+    importMap: '@knighted/jsx@1.14.0',
+    esm: '@knighted/jsx@1.14.0',
+    jspmGa: 'npm:@knighted/jsx@1.14.0',
   },
   jsxTransform: {
-    importMap: '@knighted/jsx/transform',
-    esm: '@knighted/jsx/transform',
-    jspmGa: 'npm:@knighted/jsx/transform',
+    importMap: '@knighted/jsx@1.14.0/transform',
+    esm: '@knighted/jsx@1.14.0/transform',
+    jspmGa: 'npm:@knighted/jsx@1.14.0/transform',
   },
   jsxReact: {
-    importMap: '@knighted/jsx/react',
-    esm: '@knighted/jsx/react',
-    jspmGa: 'npm:@knighted/jsx/react',
+    importMap: '@knighted/jsx@1.14.0/react',
+    esm: '@knighted/jsx@1.14.0/react',
+    jspmGa: 'npm:@knighted/jsx@1.14.0/react',
   },
   react: {
     importMap: 'react',
@@ -100,9 +101,13 @@ export const cdnImportSpecs = {
     jspmGa: 'npm:less',
   },
   lightningCssWasm: {
-    importMap: '@parcel/css-wasm',
-    esm: '@parcel/css-wasm',
-    jspmGa: 'npm:@parcel/css-wasm',
+    /**
+     * Keep this pinned to a runtime version verified with @knighted/css browser.
+     * Drift here can break cssFromSource module transforms (e.g. drafts.nesting).
+     */
+    importMap: 'lightningcss-wasm@1.30.1',
+    esm: 'lightningcss-wasm@1.30.1',
+    jspmGa: 'npm:lightningcss-wasm@1.30.1',
   },
   typescript: {
     importMap: 'typescript',
diff --git a/src/modules/preview/render-runtime.js b/src/modules/preview/render-runtime.js
index 6ad0b9c..28e3d91 100644
--- a/src/modules/preview/render-runtime.js
+++ b/src/modules/preview/render-runtime.js
@@ -318,7 +318,7 @@ export const createRenderRuntimeController = ({
     if (hasNamedInit) {
       await module.init()
     } else if (hasNamedTransform && typeof module.default === 'function') {
-      // @parcel/css-wasm exports default init + named transform.
+      // Common WASM ESM shape: default init + named transform.
       await module.default()
     }