Modular repulsion

Normal sudoku rules apply. Digits in a cage do not repeat and sum to the clue in the top left. Adjacency restriction: Orthogonally adjacent digits never differ by a multiple of 3, e.g. the digit 1 may not be orthogonally adjacent to either 4 or 7. In other words, the integers from 1 to 9 are divided into the three groups with respect to their remainder mod 3 (147, 258 and 369) and no two digits from the same group may be orthogonally adjacent.