FROM python:3.12-slim

WORKDIR /app

# System deps
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc libpq-dev \
    && rm -rf /var/lib/apt/lists/*

# Python deps (cached layer)
COPY backend/requirements.txt /app/requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

# Application code
COPY backend/ /app/

EXPOSE 8000

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]