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Now that we live in the era of dark mode and auto-switching themes, I think many users may appreciate if Primer Spec switched between a light and dark theme automatically based on the system settings.
After speaking with @bellakiminsun, we decided that we liked Slack's approach to dark-mode the best — each Slack theme has a light variant and a dark variant, and Slack lets users customize whether the variants/modes switch with the system settings.
This PR adds a first-pass implementation of auto-dark mode inspired by Slack:
default
,bella
,modern
andxcode-civic
light
,dark
,system
(default)system
mode, the theme changes between light and dark modes based on the system settings.Validation:
Visit the preview URL for this PR, and play around with different combinations of the subthemes and modes. Also play around with your system settings for light/dark mode and verify their interaction with the Primer Spec site's subtheme.