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+# ── Base image ──────────────────────────────────────────────────────────────
+# HF Spaces expects port 7860 and runs as a non-root user by default.
+# python:3.10-slim keeps the image lean; ffmpeg handles any resample needs.
+FROM python:3.10-slim
+
+# ── System deps ─────────────────────────────────────────────────────────────
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ffmpeg \
+    && rm -rf /var/lib/apt/lists/*
+
+# ── Working directory ────────────────────────────────────────────────────────
+WORKDIR /app
+
+# ── Python deps ──────────────────────────────────────────────────────────────
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# ── App code ─────────────────────────────────────────────────────────────────
+COPY app.py .
+
+# ── HF Spaces: non-root user required ────────────────────────────────────────
+RUN useradd -m appuser
+USER appuser
+
+# ── Expose HF Spaces default port ────────────────────────────────────────────
+EXPOSE 7860
+
+# ── Start ─────────────────────────────────────────────────────────────────────
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]