Logic Masters Deutschland e.V.

This was originally created for the Yin Yang Journey puzzle pack. Links to previous puzzles in the pack are below:
Go Yin Yang
Through the Caverns
Sandwich Break
Staircase Serpent
Roman Negativity
Into Chaos
At Odds with Where to Go
Twin Yang

Rules:

Normal Sudoku rules apply.

Yin Yang: Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded.

The shaded region acts as a German Whispers line: if two orthogonally connected cells are both shaded, then the digits in those cells must have a difference of at least 5.

All lines contain at least one shaded and one unshaded cell. For each line, the sum of digits in shaded cells must be equal to the sum of digits in unshaded cells on that same line.