diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..d327515
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,63 @@
+name: CI
+
+on:
+  push:
+    branches: ["*"]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install linters
+        run: pip install flake8 ruff
+
+      - name: Run flake8
+        run: |
+          flake8 . \
+            --max-line-length=120 \
+            --extend-ignore=E501,W503,E402,E722,W291,W293,W391,E303,E302,E305,E261,E262,E127,E128,E221,F401,F403 \
+            --exclude=".git,__pycache__,build,dist,.claude,*.egg-info,venv,.venv,dashboard/journal_dashboard - Copy.py" \
+            --count --show-source --statistics
+
+      - name: Run ruff
+        run: |
+          ruff check . \
+            --line-length=120 \
+            --extend-ignore=E501,E402,E722,F401,F403 \
+            --extend-exclude=".git,__pycache__,build,dist,.claude,venv,.venv,dashboard/journal_dashboard - Copy.py"
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install Tesseract OCR
+        run: sudo apt-get update && sudo apt-get install -y tesseract-ocr
+
+      - name: Install dependencies
+        run: |
+          pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install pytest
+
+      - name: Run tests
+        run: |
+          if [ -d "tests" ]; then
+            python -m pytest tests/ -v --tb=short
+          else
+            echo "No tests directory found, skipping tests"
+          fi
diff --git a/dashboard/journal_chat.py b/dashboard/journal_chat.py
index 871b56f..dd48318 100644
--- a/dashboard/journal_chat.py
+++ b/dashboard/journal_chat.py
@@ -193,9 +193,9 @@
     st.sidebar.metric("Total Entries", stats['total_entries'])
     st.sidebar.metric("Total Words", f"{stats['total_words']:,}")
     if stats['date_range']['first']:
-        st.sidebar.text(f"Date Range:")
+        st.sidebar.text("Date Range:")
         st.sidebar.text(f"{stats['date_range']['first']}")
-        st.sidebar.text(f"to")
+        st.sidebar.text("to")
         st.sidebar.text(f"{stats['date_range']['last']}")
 except Exception:
     pass
diff --git a/dashboard/journal_dashboard.py b/dashboard/journal_dashboard.py
index 0b9af4f..7de5906 100644
--- a/dashboard/journal_dashboard.py
+++ b/dashboard/journal_dashboard.py
@@ -949,4 +949,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()
diff --git a/ocr/auto_ocr_watcher.py b/ocr/auto_ocr_watcher.py
index f0de0fb..524f45c 100644
--- a/ocr/auto_ocr_watcher.py
+++ b/ocr/auto_ocr_watcher.py
@@ -104,12 +104,12 @@ def watch_folder(watch_dir: str, output_dir: str, engine: str = "tesseract"):
     if not watch_path.exists():
         raise FileNotFoundError(f"Watch directory does not exist: {watch_dir}")
     
-    print(f"Starting journal photo watcher...")
+    print("Starting journal photo watcher...")
     print(f"   Watching: {watch_path.absolute()}")
     print(f"   Output: {output_dir}")
     print(f"   OCR Engine: {engine}")
-    print(f"\nAdd new journal photos to the watch folder to process them automatically.")
-    print(f"   Press Ctrl+C to stop.\n")
+    print("\nAdd new journal photos to the watch folder to process them automatically.")
+    print("   Press Ctrl+C to stop.\n")
     
     # Initialize pipeline
     pipeline = JournalOCRPipeline(engine=engine, output_dir=output_dir)
diff --git a/plugins/calendar_view.py b/plugins/calendar_view.py
index face6a0..20347c3 100644
--- a/plugins/calendar_view.py
+++ b/plugins/calendar_view.py
@@ -54,7 +54,6 @@ def render(ctx):
 
     theme = ctx.load_theme()
     link_color = theme.get("link_color", "#0066cc")
-    bg_color = theme.get("bg_color", "#ffffff")
     text_color = theme.get("text_color", "#111111")
 
     # Determine a subtle highlight for entry days
diff --git a/rag/journal_rag.py b/rag/journal_rag.py
index d61b5ff..407cd1e 100644
--- a/rag/journal_rag.py
+++ b/rag/journal_rag.py
@@ -474,7 +474,7 @@ def interactive_search(rag: JournalRAG, use_llm: bool = False, llm_model: str =
     print("="*60)
     
     stats = rag.get_stats()
-    print(f"\nDatabase Stats:")
+    print("\nDatabase Stats:")
     print(f"  Entries: {stats['total_entries']}")
     print(f"  Date Range: {stats['date_range']['first']} to {stats['date_range']['last']}")
     print(f"  Total Words: {stats['total_words']:,}")
@@ -541,7 +541,7 @@ def interactive_search(rag: JournalRAG, use_llm: bool = False, llm_model: str =
             
             elif command == 'list':
                 entries = rag.list_all_entries()
-                print(f"\nAll entries in database:\n")
+                print("\nAll entries in database:\n")
                 for entry in entries:
                     print(f"  {entry['date']} - {entry['chunks']} chunks, ~{entry['word_count']} words")
                 print()
@@ -565,7 +565,7 @@ def interactive_search(rag: JournalRAG, use_llm: bool = False, llm_model: str =
             
             elif command == 'stats':
                 stats = rag.get_stats()
-                print(f"\nDatabase Statistics:")
+                print("\nDatabase Statistics:")
                 print(f"  Total Entries: {stats['total_entries']}")
                 print(f"  Total Chunks: {stats['total_chunks']}")
                 print(f"  Total Words: {stats['total_words']:,}")
@@ -680,7 +680,7 @@ def main():
     
     elif args.command == 'list':
         entries = rag.list_all_entries()
-        print(f"\nAll entries in database:\n")
+        print("\nAll entries in database:\n")
         for entry in entries:
             print(f"  {entry['date']} - {entry['chunks']} chunks, ~{entry['word_count']} words")
         print(f"\nTotal: {len(entries)} entries\n")