Design
Header layouts
This post shows Logo left, Logo center, and Stacked layouts with screenshots.
Design
Visual/typography features
Design
Dark mode and color schemes
This post explains color_scheme Auto/Light/Dark setting. Screenshots or embedded CodePen showing the light-dark() transitions.
Design
Typography showcase
This page displays every heading level, blockquotes, code blocks, lists, Koenig callout/toggle/table cards. The definitive test of 06-koenig.