Done the configuration

main.py

@@ -3,27 +3,28 @@ from pathlib import Path
 from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
 from fastapi.responses import FileResponse
-from core.database import engine, Base
-from api.invoices import router as invoice_router
+
+# FIXED IMPORTS: Added 'backend.' prefix so Vercel can find the modules
+from backend.core.database import engine, Base
+from backend.api.invoices import router as invoice_router
 
 # Create tables in Neon
 Base.metadata.create_all(bind=engine)
 
 app = FastAPI(title="SmiloCAD Invoice API")
 
-# Always resolve static paths relative to this file (works regardless of CWD)
+# Path logic for Vercel
 BASE_DIR = Path(__file__).resolve().parent
+
+# Mount Static Files (Ensure these folders exist inside backend/frontend/)
 app.mount("/js", StaticFiles(directory=BASE_DIR / "frontend" / "js"), name="js")
 app.mount("/css", StaticFiles(directory=BASE_DIR / "frontend" / "css"), name="css")
 app.mount("/img", StaticFiles(directory=BASE_DIR / "frontend" / "img"), name="img")
 
-# 1. Route to serve the index.html
+# Serve the index.html
 @app.get("/")
 async def serve_index():
     return FileResponse(BASE_DIR / "frontend" / "index.html")
 
-    # 2. Mount the CSS and JS folders so the HTML can find them
-# This matches your folder names: frontend/css and frontend/js
-
-# Include the routes from the api folder
-app.include_router(invoice_router)
+# Include the routes - the prefix '/api' is handled by vercel.json
+app.include_router(invoice_router)