Problem with negative values when using mathf.clamp to limit rotation

I have encountered a problem in my code. The purpose of this script is to make the main camera rotate on the x and y axis with help of wasd and the mouse when it is close to the edges of the screen.

The problem is when I try to implement limits to the rotation with mathf.clamp. I realize that mathf.clamp doesn't like negative values, but I don't know how to solve it. So when I'm trying to limit a cameras rotation between -15 and 35 on the x axis and between -175 and -105 on the y axis. On the x axis, the rotation stops at 35, but as soon as I go over the 0 value on the x axis, it snaps to 35. As for the y axis, it is constantly locked to -105.

I get that Euler doesn't have negative values, but I have yet to find a workaround for this.

Anyway, here's the code:

 using UnityEngine;
 
 public class CameraController : MonoBehaviour {
 
     public float rotSpeed = 20f;
     public float rotBorderThickness = 40f;
 
     void Update () {
 
         Quaternion qRot = Camera.main.transform.rotation;
         Vector3 rot = qRot.eulerAngles;
 
         if ((Input.GetKey("w") || Input.mousePosition.y >= Screen.height - rotBorderThickness))
         {
                 rot.x -= rotSpeed * Time.deltaTime;
         }
         if (Input.GetKey("s") || Input.mousePosition.y <= rotBorderThickness)
         {
                 rot.x += rotSpeed * Time.deltaTime;
         }
         if (Input.GetKey("a") || Input.mousePosition.x <= rotBorderThickness)
         {
             rot.y -= rotSpeed * Time.deltaTime;
         }
         if (Input.GetKey("d") || Input.mousePosition.x >= Screen.width - rotBorderThickness)
         {
             rot.y += rotSpeed * Time.deltaTime;
         }
         //Here's the problem
         rot.y = Mathf.Clamp(rot.y, -175, -105);
         rot.x = Mathf.Clamp(rot.x, -15, 35);
 
         Quaternion newRot = Quaternion.Euler(rot);
         transform.rotation = newRot;
     }
 }