diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..e9efc6b
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,60 @@
+name: CodeSnip CI
+
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    name: Validate project
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Validate package.json
+        run: node -e "const p=require('./package.json'); if (!p.name || !p.version || !p.main) process.exit(1); console.log('package.json OK')"
+
+      - name: Check JavaScript syntax
+        run: node --check main.js && node --check renderer.js
+
+  build:
+    name: Build Windows app
+    runs-on: windows-latest
+    needs: validate
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build portable Windows app
+        run: npm run dist
+
+      - name: Upload build artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: CodeSnip-Windows
+          path: dist/*.exe
+          if-no-files-found: error
diff --git a/ci-test.txt b/ci-test.txt
new file mode 100644
index 0000000..4b9a94c
--- /dev/null
+++ b/ci-test.txt
@@ -0,0 +1 @@
+CodeSnip CI validation trigger