:root{color-scheme:dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}body{margin:0;background:#0f172a;color:#e2e8f0}.app{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:1.5rem}.app h1{margin:0 0 .5rem;font-size:1.75rem}.health strong{color:#38bdf8}