Limit Rotation of Camera around a player using keyboard

I’m trying to configure the camera to follow my player, but I’m having trouble limiting the rotation of the x angle as I don’t want the camera above the head or under the feet.

This is the code so far:

using System;
using Unity.Mathematics;
using UnityEngine;

public class CameraFollow : MonoBehaviour
    public Transform target;
    public Vector3 offset;
    [Range(0.01f, 1.0f)]
    public float smoothing = 0.125f;
    public bool Look = false;
    public float speed = 2.0f;
    private float rotY, rotX;
    void LateUpdate()
        if (target)
            Vector3 desiredPosition = target.position + offset;
            transform.position = Vector3.Slerp(transform.position, desiredPosition, smoothing);

            rotY = Input.GetAxis("Horizontal") * speed;
            rotX = Input.GetAxis("Vertical") * speed;
            //Limit the X rotation of the camera
            rotX = Mathf.Clamp(rotX, -10, 30);
            //Rotate camera
            offset = Quaternion.AngleAxis(rotY, Vector3.down) * offset;
            offset = Quaternion.AngleAxis(rotX, Vector3.right) * offset;
            if (Look)

There are literally hunders of these questions on this forum. And they all boil down to the same 2 issues:

  1. a unique rotation has multiple ways to be described by a set of euler angles.
  2. When an axis rotation goes negative then unity will add 360 degrees. So Mathf.Clamp can not be used here as the angle will always be between 0 and 360.