10.
已知向量\(\overrightarrow{a}=(\dfrac{1}{2},\dfrac{1}{2}\sin x+\dfrac{\sqrt{3}}{2}\cos x),\overrightarrow{b}=(1,y)\), 若\(\overrightarrow{a}/\!/\overrightarrow{b}\),设函数\(y=f(x)\).
\((1)\)求函数\(y=f(x)\)的最小正周期;
\((2)\)已知锐角\(\triangle ABC\)的三个内角分别为\(A\),\(B\),\(C\),若有\(f(A-\dfrac{\pi }{3})=\sqrt{3}\),边\(BC= \sqrt{7} \),\(\sin B=\dfrac{\sqrt{21}}{7}\),求\(AC\)的长及\(\triangle ABC\)的面积.