diff --git a/backend/main.py b/backend/main.py
index 77188d0..76baed3 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -990,6 +990,10 @@ STATIC_DIR = Path("/app/static")
 if not STATIC_DIR.exists():
     STATIC_DIR = Path("/app/frontend/dist")
 
+# Mount /assets for Vite-built JS/CSS bundles
+if STATIC_DIR.exists() and (STATIC_DIR / "assets").exists():
+    app.mount("/assets", StaticFiles(directory=str(STATIC_DIR / "assets")), name="assets")
+
 
 @app.get("/")
 async def serve_index():
@@ -999,7 +1003,17 @@ async def serve_index():
     return {"message": "Claude Persistent Agent API v3.0", "docs": "/docs"}
 
 
-# Mount static assets AFTER all API/WS routes are registered
-# This ensures /api/* and WebSocket routes take priority
-if STATIC_DIR.exists():
-    app.mount("/", StaticFiles(directory=str(STATIC_DIR), html=True), name="spa")
+@app.get("/{full_path:path}")
+async def serve_spa(full_path: str):
+    """Serve React SPA for all non-API routes. API and WS are handled above."""
+    if full_path.startswith("api"):
+        raise HTTPException(404)
+    # Try serving the file directly (e.g. vite.svg, favicon)
+    file_path = STATIC_DIR / full_path
+    if file_path.is_file():
+        return FileResponse(str(file_path))
+    # Fall back to index.html for SPA routing
+    index = STATIC_DIR / "index.html"
+    if index.exists():
+        return FileResponse(str(index))
+    raise HTTPException(404)