:root { color-scheme: light; font-family: system-ui, sans-serif; }
body { min-height: 100vh; margin: 0; display: grid; place-items: center; background: #f5f7fa; color: #1d2939; }
main { max-width: 40rem; padding: 3rem; text-align: center; }
.brand { color: #0b6e4f; font-weight: 800; letter-spacing: .12em; }
h1 { margin-bottom: 1.5rem; }