:root { color-scheme: light dark; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center;
       font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
       background: #0f1519; color: #e6ebef; padding: 2rem; }
main { max-width: 34rem; }
h1 { font-size: 1.5rem; font-weight: 600; margin: 0 0 1rem; letter-spacing: -0.01em; }
p { margin: 0 0 1rem; color: #b6c0c8; }
a { color: #e6ebef; }
.mark { font-weight: 700; letter-spacing: -0.02em; margin: 0 0 2rem; }