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The edge where the frozen columns end had a shadow drawn inside the pinned cell with `--border`. That token is tuned for hairlines between adjacent surfaces — oklch .945 in light mode — and all but disappears once spread into a shadow, so the boundary read as unmarked while content slid underneath it. Darkening it in place only made the frozen column look outlined: an inset shadow can shade that cell's own edge and nothing else, while the depth being described belongs to the content passing beneath. Split into the two things MUI X's data grid separates, a permanent border for where the boundary is and a shadow for something crossing it right now: - the rule between the frozen columns and the rest stays put, as before; - a 12px gradient is cast past the frozen block, mounted outside the scroll container and shown only while scrolled sideways. Its position is measured off the DOM — the trailing frozen header carries a `data-pinned-edge` marker — rather than summed from column sizes. Fixed table-layout stretches columns past their configured widths whenever the container is wider than the table's min-width, so a sum lands the marker in the middle of visible content. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>