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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install dependencies first (cached layer)
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY models.py .
+COPY tasks.py .
+COPY graders.py .
+COPY environment.py .
+COPY app.py .
+
+# HF Spaces expects port 7860
+EXPOSE 7860
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -c "import requests; requests.get('http://localhost:7860/health').raise_for_status()"
+
+# Run the server
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]