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+# ─────────────────────────────────────────────────────────────────────────────
+# Dockerfile for HuggingFace Spaces (Docker SDK)
+#
+# Hardware target: CPU Space (free tier) or GPU Space (T4-small recommended).
+# Port 7860 is the HF Spaces standard.
+#
+# Build order:
+#   1. System deps (libsndfile for soundfile, git for pip installs)
+#   2. Python packages (cached layer)
+#   3. App code (invalidates only on source changes)
+#   4. Switch to non-root user (HF Spaces requirement)
+# ─────────────────────────────────────────────────────────────────────────────
+
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# ── System dependencies ───────────────────────────────────────────────────── #
+RUN apt-get update && apt-get install -y --no-install-recommends \
+      libsndfile1 \
+      libgomp1 \
+      git \
+    && rm -rf /var/lib/apt/lists/*
+
+# ── Python dependencies (cached unless requirements.txt changes) ──────────── #
+COPY requirements.txt .
+
+# Install CPU-only torch first (saves ~1 GB over default CUDA wheel).
+# Comment these two lines out and use the plain pip install if you have a GPU Space.
+RUN pip install --no-cache-dir \
+      torch==2.5.1+cpu torchaudio==2.5.1+cpu \
+      --index-url https://download.pytorch.org/whl/cpu
+
+RUN pip install --no-cache-dir -r requirements.txt
+
+# ── Application code ─────────────────────────────────────────────────────── #
+COPY . .
+
+# ── Non-root user for HF Spaces compatibility ─────────────────────────────── #
+RUN useradd -m -u 1000 appuser \
+    && chown -R appuser:appuser /app
+USER 1000
+
+# ── Model cache lives in the user home so HF Spaces can persist it ────────── #
+ENV HF_HOME=/home/appuser/.cache/huggingface
+ENV PORT=7860
+
+EXPOSE 7860
+
+# ── Healthcheck ───────────────────────────────────────────────────────────── #
+HEALTHCHECK --interval=60s --timeout=10s --start-period=300s \
+  CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:7860/health')"
+
+CMD ["python", "-m", "uvicorn", "app:app", \
+     "--host", "0.0.0.0", \
+     "--port", "7860", \
+     "--log-level", "info", \
+     "--ws-ping-interval", "30", \
+     "--ws-ping-timeout", "60"]