diff --git a/endpoints/signup.post.py b/endpoints/signup.post.py
index 47f7fae..27590e6 100644
--- a/endpoints/signup.post.py
+++ b/endpoints/signup.post.py
@@ -1,4 +1,4 @@
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter, Depends, HTTPException
 from core.database import fake_users_db
 import uuid
 
@@ -8,26 +8,49 @@ router = APIRouter()
 async def signup_demo(
     username: str = "new_user",
     email: str = "user@example.com",
-    password: str = "securepassword123"
+    password: str = "securepassword123",
+    first_name: str = "John",
+    last_name: str = "Doe",
+    phone_number: str = "+1234567890"
 ):
-    """Demo signup endpoint"""
+    """Demo signup endpoint with extended user details"""
     if username in fake_users_db:
         raise HTTPException(status_code=400, detail="Username already exists")
     
+    if not email or '@' not in email:
+        raise HTTPException(status_code=400, detail="Invalid email format")
+    
     user_id = str(uuid.uuid4())
     fake_users_db[username] = {
         "id": user_id,
         "email": email,
         "password": password,
-        "disabled": False
+        "first_name": first_name,
+        "last_name": last_name,
+        "phone_number": phone_number,
+        "disabled": False,
+        "created_at": str(uuid.uuid1()),
+        "profile_complete": True
     }
     
     return {
         "message": "User created successfully",
         "user_id": user_id,
         "username": username,
+        "profile": {
+            "first_name": first_name,
+            "last_name": last_name,
+            "email": email,
+            "phone_number": phone_number
+        },
         "next_steps": [
-            "Verify your email (demo)",
-            "Complete profile setup"
-        ]
-    }
+            "Verify your email address",
+            "Complete additional profile information",
+            "Set up two-factor authentication"
+        ],
+        "features": {
+            "rate_limit": 100,
+            "expires_in": 3600,
+            "profile_status": "complete"
+        }
+    }
\ No newline at end of file