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+# ===== SuperKart Backend (Flask) =====
+FROM python:3.11-slim
+
+# Basic env hygiene
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+WORKDIR /app
+
+# Install system deps (if you need gcc for some pip builds, uncomment the next line)
+# RUN apt-get update && apt-get install -y --no-install-recommends build-essential && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for better caching
+COPY requirements.txt /app/requirements.txt
+
+# Install Python deps (add gunicorn here to serve Flask in production)
+RUN pip install --no-cache-dir -r /app/requirements.txt \
+    && pip install --no-cache-dir gunicorn==21.2.0
+
+# Copy the backend app
+COPY . /app
+
+# Expose a port (Spaces will inject PORT; exposing is optional but helpful locally)
+EXPOSE 7860
+
+# Default to gunicorn, binding to $PORT if provided (Spaces) or 8000 locally
+ENV PORT=7860
+CMD ["sh", "-c", "gunicorn --bind 0.0.0.0:${PORT:-8000} app:app"]