Leandro Trossard's winner nudged Norwich City closer to relegation as Brighton all but ensured a fourth straight season in the Premier League with a rare away win.
Norwich boss Daniel Farke dropped Teemu Pukki and Todd Cantwell - his two leading scorers - but the move backfired as the Premier League's bottom club mustered just one serious attempt on target.
Belgian winger Trossard settled a scrappy match with a smart finish, sweeping home Aaron Mooy's perfect delivery in what was Brighton's first genuine attack.
Nineteen-year-old substitute Adam Idah was denied an equaliser when he headed against the post in stoppage time.
Norwich remain bottom of the table, seven points from safety with five games left, while Brighton's third away win of the season lifts them nine points above the relegation zone.
Reaction from Carrow Road as Norwich slip closer to relegationFarke's bold changes backfire
This was a must-win game if Norwich were to revive their fading hopes of staying in the Premier League. Instead they fell to a fifth straight league defeat without scoring.
They can still reach 36 points, and 17th-placed Watford have 28 points. But it is hard to see where their next goal - never mind win - is going to come from.
This was the first of three successive matches against teams in or just above the relegation zone yet Farke opted to start without Pukki and Cantwell for his side's fifth match in 15 days.
Finland forward Pukki has scored 11 of his team's 25 league goals this season, but none in his past 10 league and cup games, while midfielder Cantwell has also chipped in with some key goals, including efforts against Manchester City, Arsenal and Wolves.
Farke said the changes were to freshen up the side after an error-ridden 4-0 midweek defeat at Arsenal but there was a distinct familiarity to the way his team huffed and puffed without creating much.
Cuban forward Onel Hernandez was lively without testing keeper Mat Ryan, while Republic of Ireland Under-21 forward Idah was only denied by a post in the dying moments.
In two of their final three games before football was suspended because of the coronavirus pandemic, Norwich beat Leicester in the Premier League and Tottenham on penalties in the FA Cup.
Since the restart, they have failed to register a single point and are going backwards.
More to follow.