:root { color-scheme: light dark; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  background: #ffffff; color: #0d1420;
  font: 400 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) { body { background: #0d1218; color: #e6eaf1; } }
main { max-width: 28rem; padding: 2rem; text-align: center; }
h1 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.01em; margin: 0 0 0.6rem; }
p { margin: 0; color: #59647a; }
@media (prefers-color-scheme: dark) { p { color: #8593a8; } }
a { color: #143a72; }
@media (prefers-color-scheme: dark) { a { color: #86abe9; } }