:root{color-scheme:dark light;font-family:system-ui,sans-serif;line-height:1.5}body{margin:0;min-height:100vh;background:#0f1218;color:#e8ecf1}.app{max-width:40rem;margin:0 auto;padding:3rem 1.5rem}h1{font-weight:650;letter-spacing:-.02em}.muted{color:#9aa6b2}