FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Set work directory
WORKDIR /app

# Install dependencies
COPY requirements.txt /app/
RUN pip install --upgrade pip && \
    pip install -r requirements.txt

# Copy project
COPY . /app/

# Collect static files
RUN python manage.py collectstatic --noinput

# Expose port
EXPOSE 8000

# Run gunicorn
CMD ["gunicorn", "myproject.wsgi:application", "--bind", "0.0.0.0:8000"]
```

**Optional: Create `.dockerignore`:**
```
*.pyc
__pycache__
db.sqlite3
.env
.git
venv/