:root { color-scheme: light dark; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font: 1.125rem/1.6 system-ui, sans-serif;
  background: Canvas;
  color: CanvasText;
}
main { padding: 2rem; max-width: 40rem; }
h1 { margin: 0 0 0.5rem; font-weight: 600; }
p { margin: 0; opacity: 0.7; }