:root { color-scheme: light; --ink: #163146; --paper: #f4f8fa; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center;
  background: var(--paper); color: var(--ink); font: 1rem/1.5 system-ui, sans-serif; }
main { padding: 2rem; text-align: center; }
h1 { font-size: clamp(1.5rem, 5vw, 2.5rem); font-weight: 600; }