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FROM python:3.10-slim

RUN apt-get update && apt-get install -y --no-install-recommends \
    libgl1 libglib2.0-0 gcc g++ \
    && rm -rf /var/lib/apt/lists/*

RUN useradd -m -u 1000 user
USER user
ENV HOME=/home/user PATH=/home/user/.local/bin:$PATH

WORKDIR $HOME/app

# Install CPU-only PyTorch first (critical: use --index-url not --extra-index-url)
RUN pip install --no-cache-dir \
    torch==2.1.0+cpu torchvision==0.16.0+cpu \
    --index-url https://download.pytorch.org/whl/cpu

# Install remaining deps
COPY --chown=user requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY --chown=user app.py .

EXPOSE 7860
CMD ["python", "app.py"]