NOTE_SHADOW_COLOR

The soft shadow that falls below a note. Chosen so the darkest pixel just under the body composites to #c0c4c5 over the #f9fafb page and fades out about twelve pixels down, matching the reference.

The shadow is decoration *outside* the body: it is drawn by the DOM overlay (and by a filter in SVG export) and never enters the shape's geometry, bounds or hit-testing.