Whole-document sideways versus one sideways page

uniform-sideways.pdf has rotations 90,90,90 degrees; mixed-orientation.pdf has 0,90,0. Each page carries a TOP - PAGE marker.

1. Inspect which pages are sideways. Apply an additional 270 degrees to the uniformly sideways source in Rotate PDF pages.

2. Download and inspect every TOP marker. Run the same setting on a separate mixed-orientation copy to expose the cost of rotating everything.

3. Retain the uniform correction. Return to the original mixed document and use a page-selective rotation editor.

Adding 270 produces 0,0,0 for the uniform source. For the mixed source it produces 270,0,270: the middle is corrected while the other two are turned. Angles wrap modulo 360.

Fixing the middle page alone does not pass the mixed-document check. This mode rotates every page. A selective editing route still requires checking all three pages and retaining the original.
