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+# ── Base image — Python 3.11 slim ─────────────────────────────────────────────
+FROM python:3.11-slim
+
+# ── System dependencies for OpenCV + WebRTC ───────────────────────────────────
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libglib2.0-0 \
+    libgl1 \
+    libsm6 \
+    libxext6 \
+    libxrender-dev \
+    libgomp1 \
+    ffmpeg \
+    && rm -rf /var/lib/apt/lists/*
+
+# ── Working directory ─────────────────────────────────────────────────────────
+WORKDIR /app
+
+# ── Copy requirements first (Docker cache layer) ──────────────────────────────
+COPY requirements.txt .
+
+# ── Install Python dependencies ───────────────────────────────────────────────
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+# ── Copy project files ────────────────────────────────────────────────────────
+COPY . .
+
+# ── Create necessary directories ──────────────────────────────────────────────
+RUN mkdir -p logs results models data
+
+# ── Hugging Face Spaces runs as user 1000 ─────────────────────────────────────
+RUN useradd -m -u 1000 user
+RUN chown -R user:user /app
+USER user
+
+# ── Expose Streamlit port ─────────────────────────────────────────────────────
+EXPOSE 7860
+
+# ── Streamlit config ──────────────────────────────────────────────────────────
+ENV STREAMLIT_SERVER_PORT=7860
+ENV STREAMLIT_SERVER_ADDRESS=0.0.0.0
+ENV STREAMLIT_SERVER_HEADLESS=true
+ENV STREAMLIT_BROWSER_GATHER_USAGE_STATS=false
+
+# ── Launch ────────────────────────────────────────────────────────────────────
+CMD ["streamlit", "run", "app.py", \
+     "--server.port=7860", \
+     "--server.address=0.0.0.0", \
+     "--server.headless=true"]