diff --git a/Dockerfile b/Dockerfile
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+++ b/Dockerfile
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+FROM node:18-alpine
+
+# Create app directory
+WORKDIR /usr/src/app
+
+# Set production environment
+ENV NODE_ENV=production
+
+# Install production dependencies (use yarn.lock if present)
+COPY package.json yarn.lock ./
+RUN npm install --production --no-audit --prefer-offline
+
+# Copy application source
+COPY . .
+
+# Run as non-root user
+RUN chown -R node:node /usr/src/app
+USER node
+
+# Default port (matches server.js fallback)
+EXPOSE 8079
+
+# Start command
+CMD ["npm", "start"]
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