2.
如图:在平行六面体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)中,点\(M\)是线段\(A_{1}D\)的中点,点\(N\)在线段\(C_{1}D_{1}\)上,且\(D_{1}N= \dfrac {1}{3}D_{1}C_{1}\),\(∠A_{1}AD=∠A_{1}AB=60^{\circ}\),\(∠BAD=90^{\circ}\),\(AB=AD=AA_{1}=1\).
\((1)\)求满足\( \overrightarrow{MN}=x \overrightarrow{AB}+y \overrightarrow{AD}+z \overrightarrow{AA_{1}}\)的实数\(x\)、\(y\)、\(z\)的值.
\((2)\)求\(AC_{1}\)的长.