[RbnJrg]

Originally Posted by Slevin#7

@RbnJrg, thanks for this comprehensive discription. Your first suggestion I've already tried - but didn't work. The second approach is kinda crazy shit I'd never come up by my own^^, thus big points for that - although, you can guess, unfortunately doesn't work as well.

Indeed, Apple Books doesn't allow much flexibility in dark mode But do one last try; instead to apply a color do cheat and apply a gradient to the text. Of course, this gradient isn't actually a gradient, but a solid color. Use the following style:

@media (prefers-color-scheme: dark) {
    a,
    a:link,
    a:visited,
    a:hover,
    a:focus,
    a:active {
        background: linear-gradient(#cc0000, #cc0000) !important; 
        background: -webkit-linear-gradient(#cc0000, #cc0000) !important;
        background-clip: text !important;
        -webkit-background-clip: text !important;
        color: transparent !important;
        -webkit-text-fill-color: transparent !important;
    }
}

As you can see, the gradient is not such because the same color is used as stops.