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+# ---- Stage 1: Build ----
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+# Vite bakes VITE_* vars in at BUILD time — pass them as build args
+# (see docker-compose.yml). Empty values keep the demo fallback UI.
+ARG VITE_SUPABASE_URL=""
+ARG VITE_SUPABASE_ANON_KEY=""
+ARG VITE_API_URL=""
+ENV VITE_SUPABASE_URL=$VITE_SUPABASE_URL \
+    VITE_SUPABASE_ANON_KEY=$VITE_SUPABASE_ANON_KEY \
+    VITE_API_URL=$VITE_API_URL
+
+# Install dependencies first (layer caching)
+COPY package.json ./
+RUN npm install
+
+# Copy source and build frontend + bundle server
+COPY . .
+RUN npm run build
+
+# ---- Stage 2: Production ----
+FROM node:20-alpine AS production
+WORKDIR /app
+
+# HF Spaces routes to 7860 — the server MUST default to it (see server.ts).
+ENV NODE_ENV=production \
+    PORT=7860
+
+# Install production-only dependencies (esbuild, vitest, typescript etc. excluded)
+COPY package.json ./
+RUN npm install --omit=dev && npm cache clean --force
+
+# Copy the built output from builder stage
+COPY --from=builder /app/dist ./dist
+
+EXPOSE 7860
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+  CMD wget -qO- http://127.0.0.1:7860/api/health >/dev/null 2>&1 || exit 1
+
+CMD ["node", "dist/server.cjs"]