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The whole 1,324-image dataset is line art on white, so in dark mode every exercise card is a floodlight — a 320px one, mid-set, in a dim gym. The browser can invert it for free: nothing is reprocessed and the files on the server are untouched. The hue-rotate is the part that matters. invert() flips lightness and hue together, so the red highlight comes out cyan and stops reading as "this is the muscle you are working"; rotating the hue back half a turn returns it to red, and the saturate makes up for the wash-out inverting a mid-red leaves. The card behind the picture goes black in the same rule, and the no-media placeholder is excluded — it is an app icon on an app surface, with nothing to invert. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0167AVafBcfxCkNqMNtfC7uW
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The exercise dataset is dark line art on white, which in dark mode is a bright block in the middle of the screen. This inverts it in CSS only (
invert(1) hue-rotate(180deg) saturate(1.9), so the red muscle highlight stays red), on.exmediaimages and videos and on thumbnails, with a black card behind..thumb-x(the no-media placeholder) is excluded. Nothing is reprocessed; the files on the server are untouched.CSS only, no behaviour change; checked by reading, not yet by eye on a device.
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