Kurtenbach: The 49ers’ dud performance means they have to go ‘the hard way.’ Success is a hard sell

SANTA CLARA — Black is slimming.

So are the 49ers’ chances of winning the Super Bowl this season after a 13-3 beat-down loss to the Seattle Seahawks Saturday, with San Francisco wearing a one-off, all-black uniform.

Only a few days ago, this 49ers season looked inexplicably charmed. The Niners were surging, and the No. 1 seed was sitting right there on the table like a holiday roast — the path to a Lombardi Trophy looked like a short road that seemed smoothly paved in gold.

Now?