diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e686ad6999..46a5ec927a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -91,7 +91,7 @@ jobs:
       - name: 🏗️ Build project
         run: pnpm build
 
-      - name: ♿ Accessibility audit (Lighthouse)
-        run: pnpx @lhci/cli autorun
+      - name: ♿ Accessibility audit (Lighthouse - dark & light mode)
+        run: ./scripts/lighthouse-a11y.sh
         env:
           LHCI_GITHUB_APP_TOKEN: ${{ secrets.LHCI_GITHUB_APP_TOKEN }}
diff --git a/.lighthouserc.cjs b/.lighthouserc.cjs
new file mode 100644
index 0000000000..5c4ba55894
--- /dev/null
+++ b/.lighthouserc.cjs
@@ -0,0 +1,51 @@
+const fs = require('fs')
+
+// Auto-detect Chrome executable path
+function findChrome() {
+  const paths = [
+    // Linux
+    '/usr/bin/google-chrome-stable',
+    '/usr/bin/google-chrome',
+    '/usr/bin/chromium-browser',
+    // macOS
+    '/Applications/Google Chrome.app/Contents/MacOS/Google Chrome',
+    // Windows
+    'C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe',
+    'C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe',
+  ]
+
+  for (const p of paths) {
+    if (fs.existsSync(p)) return p
+  }
+
+  return undefined
+}
+
+module.exports = {
+  ci: {
+    collect: {
+      startServerCommand: 'pnpm preview',
+      startServerReadyPattern: 'Listening',
+      url: [
+        'http://localhost:3000/',
+        'http://localhost:3000/search?q=nuxt',
+        'http://localhost:3000/nuxt',
+      ],
+      numberOfRuns: 1,
+      chromePath: findChrome(),
+      puppeteerScript: './lighthouse-setup.cjs',
+      settings: {
+        onlyCategories: ['accessibility'],
+        skipAudits: ['valid-source-maps'],
+      },
+    },
+    assert: {
+      assertions: {
+        'categories:accessibility': ['error', { minScore: 1 }],
+      },
+    },
+    upload: {
+      target: 'temporary-public-storage',
+    },
+  },
+}
diff --git a/.lighthouserc.json b/.lighthouserc.json
deleted file mode 100644
index 9ad5381fe5..0000000000
--- a/.lighthouserc.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-  "ci": {
-    "collect": {
-      "startServerCommand": "pnpm preview",
-      "startServerReadyPattern": "Listening",
-      "url": [
-        "http://localhost:3000/",
-        "http://localhost:3000/search?q=nuxt",
-        "http://localhost:3000/nuxt"
-      ],
-      "numberOfRuns": 1,
-      "settings": {
-        "onlyCategories": ["accessibility"],
-        "skipAudits": ["valid-source-maps"]
-      }
-    },
-    "assert": {
-      "assertions": {
-        "categories:accessibility": ["warn", { "minScore": 1 }]
-      }
-    },
-    "upload": {
-      "target": "temporary-public-storage"
-    }
-  }
-}
diff --git a/lighthouse-setup.cjs b/lighthouse-setup.cjs
new file mode 100644
index 0000000000..5576d96606
--- /dev/null
+++ b/lighthouse-setup.cjs
@@ -0,0 +1,24 @@
+/**
+ * Lighthouse CI puppeteer setup script.
+ * Sets the color mode (light/dark) before running accessibility audits.
+ *
+ * The color mode is determined by the LIGHTHOUSE_COLOR_MODE environment variable.
+ * If not set, defaults to 'dark'.
+ */
+
+/** @param {import('puppeteer').Browser} browser */
+module.exports = async function setup(browser, { url }) {
+  const colorMode = process.env.LIGHTHOUSE_COLOR_MODE || 'dark'
+  const page = await browser.newPage()
+
+  // Set localStorage before navigating so @nuxtjs/color-mode picks it up
+  await page.evaluateOnNewDocument(mode => {
+    localStorage.setItem('npmx-color-mode', mode)
+  }, colorMode)
+
+  // Navigate and wait for DOM only - Lighthouse will do its own full load
+  await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 60000 })
+
+  // Close the page - Lighthouse will open its own with localStorage already set
+  await page.close()
+}
diff --git a/scripts/lighthouse-a11y.sh b/scripts/lighthouse-a11y.sh
new file mode 100755
index 0000000000..2ab4dd1039
--- /dev/null
+++ b/scripts/lighthouse-a11y.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+# Run Lighthouse accessibility tests in both light and dark mode
+#
+# This script runs lhci autorun twice, once for each color mode.
+# The LIGHTHOUSE_COLOR_MODE env var is read by lighthouse-setup.cjs
+# to set the appropriate theme before each audit.
+
+set -e
+
+echo "🌙 Running Lighthouse accessibility audit (dark mode)..."
+LIGHTHOUSE_COLOR_MODE=dark pnpx @lhci/cli autorun --upload.githubStatusContextSuffix="/dark"
+
+echo ""
+echo "☀️  Running Lighthouse accessibility audit (light mode)..."
+LIGHTHOUSE_COLOR_MODE=light pnpx @lhci/cli autorun --upload.githubStatusContextSuffix="/light"
+
+echo ""
+echo "✅ Accessibility audits completed for both color modes"