diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..cab9db3
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,75 @@
+name: Build
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: macos-latest
+            label: macOS
+            build_cmd: bash scripts/build-mac.sh
+            artifact_path: desktop-dist/tono.dmg
+            artifact_name: tono-macos
+
+          - os: ubuntu-latest
+            label: Linux
+            build_cmd: bash scripts/build-linux.sh
+            artifact_path: desktop-dist/tono-linux.tar.gz
+            artifact_name: tono-linux
+
+          - os: windows-latest
+            label: Windows
+            build_cmd: npm run build:windows
+            artifact_path: desktop-dist/tono
+            artifact_name: tono-windows
+
+    runs-on: ${{ matrix.os }}
+    name: Build (${{ matrix.label }})
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: npm
+
+      # Build scripts call `uv pip install` for Python deps
+      - name: Install uv
+        run: pip install uv
+
+      # Linux: pywebview needs webkit2gtk headers to import during PyInstaller collection
+      - name: Install Linux system dependencies
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -y \
+            python3-gi python3-gi-cairo \
+            gir1.2-gtk-3.0 \
+            libwebkit2gtk-4.1-dev \
+            gir1.2-webkit2-4.1
+
+      - name: Install Node dependencies
+        run: npm install
+
+      - name: Build
+        run: ${{ matrix.build_cmd }}
+        shell: bash
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.artifact_name }}
+          path: ${{ matrix.artifact_path }}
+          if-no-files-found: error
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..8d619fa
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,31 @@
+name: Tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: npm
+
+      - name: Install Python dependencies
+        run: pip install -e ".[dev]"
+
+      - name: Install Node dependencies
+        run: npm install
+
+      - name: Run tests
+        run: python -m pytest -q
diff --git a/.gitignore b/.gitignore
index c4e5061..69ffd2f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,6 +3,7 @@
 *.DS_Store
 .pytest_cache/
 .coverage
+.claude/
 pytest-cache-files-*/
 desktop-build/
 desktop-dist/
@@ -10,5 +11,4 @@ frontend/node_modules/
 frontend/dist/
 .venv/
 sessions/
-.*/
 frontend/coverage/
\ No newline at end of file