diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..ba0cf90
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test-and-build:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: web
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: web/package-lock.json
+      - run: npm ci --include=dev
+      - name: Corpus & register tests
+        run: npm test
+      - name: Production build (static export)
+        run: npm run build
+        env:
+          NODE_ENV: production
+      - name: Verify export output
+        run: test -f out/index.html && test -f out/gloss-data.json && test -f out/abbreviations/index.html && test -f out/sitemap.xml && echo "out/ verified"