:root { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif; color: #111; }
body { margin: 0; background: #f2f2f7; }
main { max-width: 40rem; margin: 2rem auto; padding: 0 1.25rem 3rem; }
h1 { font-size: 1.8rem; }
a { color: #0088ff; }