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+# ── Build stage ───────────────────────────────────────────────────────────────
+FROM python:3.11-slim AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir --prefix=/install -r requirements.txt
+
+# ── Runtime stage ─────────────────────────────────────────────────────────────
+FROM python:3.11-slim
+
+# Hugging Face Spaces expects the app to run as a non-root user
+RUN useradd -m -u 1000 appuser
+
+WORKDIR /app
+
+# Copy installed packages
+COPY --from=builder /install /usr/local
+
+# Copy application code
+COPY --chown=appuser:appuser . .
+
+# Ensure sub-packages are importable
+RUN touch tasks/__init__.py graders/__init__.py agents/__init__.py
+
+USER appuser
+
+# HF Spaces expects port 7860
+EXPOSE 7860
+
+ENV PYTHONUNBUFFERED=1
+ENV PYTHONPATH=/app
+
+CMD ["python", "-m", "uvicorn", "server:app", "--host", "0.0.0.0", "--port", "7860"]