Glk styles, as currently defined, cannot force text to be a separate paragraph. They’re all inline styles.
For Parchment (which is stretching the spec in certain ways) you have to put in your own line breaks, and set the blockquote style for the entire paragraph.
@Dannii, I hope I’m not being super nit-picky, but the stylehint_ReverseColors hint works well in light mode, but not great in dark mode – it seems to just be using the default (light mode) colors.
A little test case, where this middle paragraph is reverse style: k5.ulx (9 KB)
No, that’s by design. In dark mode it switches to a lighter background, but doesn’t go all the way to a white/bright background as it’s meant to be easy on the eyes. Lectrote’s dark mode does the same, and the Material Design philosophy also tries to avoid bright elements in dark mode. But if a game manually specifies colours they’ll be used even in dark mode (though if it specifies only the foreground colour or only the background colour then there could be combinations which work very poorly. But that’s the case with any interpreter!)