diff --git a/Dockerfile b/Dockerfile
index da1d71c..0cd13ff 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,11 @@ WORKDIR /app
 # Skip browser downloads
 ENV PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1
 ENV CYPRESS_INSTALL_BINARY=0
-ENV NODE_ENV=production
+# NODE_ENV=production must NOT be set in this stage: with it set, `npm ci`
+# skips devDependencies (vite, @tailwindcss/vite, etc.) that `npm run build`
+# itself needs (SolidStart's build runs through vite) - the build then fails
+# with ERR_MODULE_NOT_FOUND for 'vite'. It belongs in the runtime stage only,
+# where it actually affects the running server, not here.
 
 # GATEWAY_URL is resolved at runtime from the process environment (see
 # src/lib/server/gateway.ts), not baked in at build time.
@@ -16,8 +20,10 @@ RUN apt-get update && apt-get install -y python3 make g++ git && rm -rf /var/lib
 # Copy package files
 COPY package*.json ./
 
-# Install dependencies
-RUN npm ci --legacy-peer-deps --prefer-offline --no-audit
+# Install dependencies (--include=dev is redundant with NODE_ENV unset, but
+# explicit so this doesn't silently break again if NODE_ENV=production ever
+# gets reintroduced above)
+RUN npm ci --legacy-peer-deps --prefer-offline --no-audit --include=dev
 
 # Copy source
 COPY . .
@@ -33,6 +39,7 @@ WORKDIR /app
 # Copy built output
 COPY --from=builder /app/.output ./.output
 
+ENV NODE_ENV=production
 ENV PORT=9202
 ENV HOST=0.0.0.0
 EXPOSE 9102