Two colour bugs on the same page, both invisible in light mode.
A button does not inherit color the way it inherits font, so the plain
Endpoints total rendered in the browser default black on the dark theme's card.
The coloured tiles set their own color, which is why only that one showed it.
The coloured ones were wrong too, just less obviously: dark mode redefines
--success and --warning to bright variants but leaves --success-dark and
--warning-dark tuned for a white background, so those numbers and the health
pills came out dark green and dark amber on a dark blue card.
Scoped to the stamped [data-theme="dark"] rather than a prefers-color-scheme
query, matching the note in style.css: the theme store always stamps the
attribute, and a bare media query leaks dark styling into light mode on a
dark-OS machine.
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