SPRINGFIELD — In a custody case that crosses state borders, the Illinois Supreme Court has ruled that a Champaign father can continue his effort to gain full custody of a child who now lives with his mother in Nevada. A unanimous opinion authored by Justice Lloyd A. Karmeier affirmed that circuit courts’ broad constitutional powers to hear “justiciable matters” trump a state law that lays out specific criteria for ruling in custody cases that go beyond state lines. The decision affirms a 4th …