:root { color-scheme: light dark; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; max-width: 640px; margin: 0 auto; padding: 48px 20px; line-height: 1.55; color: CanvasText; background: Canvas; }
h1 { font-size: 34px; margin: 0 0 4px; }
h2 { font-size: 20px; margin-top: 32px; }
.sub { color: GrayText; margin: 0 0 32px; }
a { color: #0a84ff; }
footer { margin-top: 48px; font-size: 14px; color: GrayText; }