With more than 3 packages the old plain/accent/premium buckets meant most
mid-priced packages looked identical. Card background, border and glow now
interpolate continuously by price rank (in HSL, not RGB, so the ramp stays
a clean green instead of passing through muddy gray-olive tones), and the
dark/light text switch is driven by the actual computed lightness instead
of an RGB luminance approximation, which was misjudging saturated mid-tone
greens as "light enough" for dark text and breaking contrast.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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