:root { color-scheme: light dark; }
body { margin: 0; font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: Canvas; color: CanvasText; }
main { max-width: 720px; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }
h1 { font-size: 1.75rem; margin: 0 0 .25rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 .5rem; }
ul { padding-left: 1.25rem; }
li { margin: .25rem 0; }