How to limit object rotation?

I'm rotating my object with Mouse Drag, and limited its rotation at certain angle, I can rotate it on counter clockwise

but i cant rotate it the oppisite direction (clockwise) somthing like this

How can I be able to rotate it on both direction but with limiting at certain angle like both images???

the following code is attached with object...`

 public class MouseDrag : MonoBehaviour
 {
     
     private float baseAngle = 0.0f;
     private float maxRotaion = 60f;
         
 
 
     void Start()
     {
 
         }
         void OnMouseDown ()
         {
 
          
         var dir = Camera.main.WorldToScreenPoint (transform.position);
         dir = Input.mousePosition - dir;
         baseAngle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
         baseAngle -= Mathf.Atan2(transform.right.y, transform.right.x) * Mathf.Rad2Deg;
         }
 
         void OnMouseDrag ()
         {
 
         // Limit platform rotation
         if (transform.rotation.eulerAngles.z <= maxRotaion ) {
                         var dir = Camera.main.WorldToScreenPoint (transform.position);
                         dir = Input.mousePosition - dir;
                         var angle = Mathf.Atan2 (dir.y, dir.x) * Mathf.Rad2Deg - baseAngle;
 
                         transform.rotation = Quaternion.AngleAxis (angle, Vector3.forward);
 
                         
 
         }        
 }