已知球\(O\)为正方体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)的内切球，\(AB=2\)，\(E\)，\(F\)分别为棱\(AD\)，\(CC_{1}\)的中点，则直线\(EF\)被球\(O\)截得的线段长为____________．