Modern is the go-to architectural style in the Hamptons these days, at least for the uber wealthy. That’s a good thing for Bridgehampton’s Barnes Coy Architects who have been designing sleek abodes for going on three decades. While most Hamptonites were building rambling shingle-style mansions, co-principals of the award-winnning firm, Rob Barnes and Christopher Coy, were focusing on loft-like spaces with vast transparencies that merge the barrier between outdoors and indoors.