Dark Mode
A second palette, not an inversion. Two grounds means two sets of greys, two accent saturations, and a supplied-asset problem nobody budgets for.
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Dark is a second palette
Inverting the light theme produces glare, muddy accents and vanished shadows. A dark theme needs its own greys, its own accent saturation and its own depth cues.
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Pure black is a trap
Maximum contrast is not maximum legibility, and on OLED it smears in motion.
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Logos of mixed polarity
Marks drawn for a white page disappear on a dark one, which is a supplied-asset problem rather than a CSS one.