click a .blur-img to open: record its viewport rect, the lightbox img
starts at that position/size and transforms to centered (Medium-style
origin-aware zoom). close flies back to the live originNode rect.
scroll-to-close: while open, any window scroll drives the image back
to its (moving) position via per-frame rect tracking + linear
interpolation; the article keeps its scroll position on close.
Esc + click-on-backdrop close; click-on-image does not close.
prefers-reduced-motion falls back to fade-only / immediate close.
xfy
a5c7e64230