The button leaves the header bar and floats over the world, centered on
the columns the next purchase unlocks. Being a place in the world rather
than on the screen, it pans away with those tiles; nothing needs to bring
it back, since the leftmost pan centers the buildable edge and the
columns lie just left of it.
Those columns now take a tint of their own, more transparent than the
locked ground behind them, so the boundary between the two says how far
one purchase reaches. The tinted area itself went undocumented until now,
and it has no left edge: expansions are unbounded, so the tint runs as far
left as the view can see, which is what made "the middle of the greyed
region" answerable only for the next expansion's slice.
The button's face becomes two lines, "Expand" over the cost. That makes
the cost a display of its own, so it carries the item tooltip the way
every other item value does instead of the whole button standing in for
it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ne3mejABZoLWKLh8fgpM3x
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