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+FROM python:3.11-slim AS builder
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y \
+    git cmake clang build-essential wget curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Clone bitnet.cpp
+RUN git clone --recursive https://github.com/microsoft/BitNet.git /opt/BitNet
+
+# Install BitNet Python deps (needed for setup_env.py)
+RUN pip install --no-cache-dir -r /opt/BitNet/requirements.txt
+
+# Build bitnet.cpp with i2_s kernel support
+# setup_env.py does the cmake build and downloads the GGUF model
+RUN cd /opt/BitNet && python setup_env.py \
+    --hf-repo microsoft/bitnet-b1.58-2B-4T-gguf \
+    -q i2_s
+
+# ─── Runtime stage ───────────────────────────────────────────────────────────
+FROM python:3.11-slim
+
+RUN apt-get update && apt-get install -y \
+    libgomp1 curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user (required by HF Spaces)
+RUN useradd -ms /bin/bash user
+WORKDIR /home/user/app
+
+# Copy built binaries and model from builder
+COPY --from=builder /opt/BitNet/build/bin /home/user/app/bin
+COPY --from=builder /opt/BitNet/models /home/user/app/models
+
+# Install Python app dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy app files
+COPY app.py .
+COPY start.sh .
+RUN chmod +x start.sh
+
+# Fix permissions
+RUN chown -R user:user /home/user/app
+
+USER user
+
+EXPOSE 7860
+
+ENV GRADIO_SERVER_NAME="0.0.0.0"
+ENV GRADIO_SERVER_PORT="7860"
+
+CMD ["./start.sh"]