Conditional 90° rotate of the fullscreen stage (frame + caption together): only
when the artwork is landscape AND the screen is a narrow portrait phone — so a
wide painting fills the long axis (turn phone to view level, tap to close).
Portrait/square art and desktop stay upright. Landscape detected from the loaded
image's natural dimensions; CSS decides WHEN via (orientation: portrait). Image
caps use swapped vh/vw units post-rotation so the whole framed piece always fits.
No screen-orientation lock API (unreliable on mobile web) — pure CSS transform.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
thejayman77
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