A feature grid that opens like an image search result: click a card and a full-width detail row slides open beneath the row that card sits in, with a notch pointing back up at it, a larger illustration and a checklist. Clicking another card in the same row swaps the content in place; a card in another row moves the panel.
Row end = last card whose offsetTop equals the clicked card's offsetTop. Panel open: WAAPI height 0 → scrollHeight 380 ms `cubic-bezier(.2,.8,.2,1)`; notch `left` transitions 300 ms to card centre − panel left. Content swap: opacity 0 → 1 over 200 ms after text replacement.
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