Logic Masters Deutschland e.V.

This is my first attempt at making a puzzle with this ruleset, having to make some exceptions to the rules to stop the breakin from breaking the entire puzzle. I'm still trying to make a puzzle without any of those exceptions, so if you want to avoid spoilers for the logic in that you can skip this. On the other hand this puzzle had too much nice logic for me not to post it.

The rules:
Place the digits 1 through 9 once each into every row, column, and 3x3 box.
Cells connected by a green German Whisper line must differ by at least 5.
Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 region is fully shaded or fully unshaded.
The sum of the shaded cells in any column or 3x3 box, other than columns 2 and 3, must sum to exactly 23 or 24.
The top 2 cells in column 5 (r1c5, r2c5) have opposite shadings.