diff --git a/artifacts/api-server/src/app.ts b/artifacts/api-server/src/app.ts
index bb41038..96dbb90 100644
--- a/artifacts/api-server/src/app.ts
+++ b/artifacts/api-server/src/app.ts
@@ -1,12 +1,9 @@
 import express, { type Express } from "express";
 import cors from "cors";
 import path from "path";
-import { fileURLToPath } from "url";
 import router from "./routes/index.js";
 import { responseTimeMiddleware } from "./middlewares/response-time.js";
 
-const __dirname = path.dirname(fileURLToPath(import.meta.url));
-
 const app: Express = express();
 
 app.set("trust proxy", 1);
@@ -50,11 +47,9 @@ app.use(responseTimeMiddleware);
 app.use("/api", router);
 
 // ── Tower (Matrix 3D frontend) ───────────────────────────────────────────────
-// Serve the pre-built Three.js world at /tower. The Matrix's WebSocket client
-// auto-connects to /api/ws on the same host.
-// __dirname resolves to artifacts/api-server/dist/ at runtime.
-// Go up three levels to reach workspace root, then into the-matrix/dist.
-const towerDist = path.join(__dirname, "..", "..", "..", "the-matrix", "dist");
+// Serve the pre-built Three.js world at /tower. WS client auto-connects to
+// /api/ws on the same host. process.cwd() = workspace root at runtime.
+const towerDist = path.resolve(process.cwd(), "the-matrix", "dist");
 app.use("/tower", express.static(towerDist));
 app.get("/tower/*splat", (_req, res) => res.sendFile(path.join(towerDist, "index.html")));