of course, I've been working on this for about 15 days now, asking at different places about proper black theme.
Why high contrast mode is impractical:
1) Since it's an accessibility feature, it looks ugly compared to the default theme. https://i.imgur.com/MtbTBcR.png
2) Programs like Notepad++ & Chrome develop UI glitches. https://i.imgur.com/FP9768I.png & https://i.imgur.com/CpZc8Av.png
3) Programs like Evernote & Telegram are unaffected.
Seems I can't reply any more with this free account.