VANCOUVER — The Vancouver Canucks know their margin of error has been whittled away. If the Canucks want to make the playoffs, they can’t afford another loss like the 1-0 defeat it suffered to the Detroit Red Wings on Thursday. “We need to buckle down. Every two points matters to us right now, every point for that matter. We’ve got to find a way to win those,” forward Tanner Pearson said after the game. “We’ve been pretty good at coming back in the third period as of late. We had some confidence going into that one that we could do it. We just couldn’t get that one.” Alex Nedeljkovic made 43 saves and the Detroit Red Wings snapped a six-game winless drought with the victory. The shutout was Nedeljkovic’s second of the season and the fifth of his career. The visiting goalie was good, but the Canucks got off to an ugly start, said head coach Bruce Boudreau. “That first period might have been our worst period all year, including the games where we gave up five goals. We must have...