body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:#1d1d1f;background:#f5f5f7}
header{padding:20px 32px;font-weight:600;font-size:18px;background:#fff;border-bottom:1px solid #e5e5ea}
.logo{display:inline-block;width:28px;height:28px;margin-right:8px;border-radius:6px;background:#3b5bdb;color:#fff;text-align:center;line-height:28px}
main{max-width:720px;margin:48px auto;padding:0 24px}
h1{font-size:32px;margin:0 0 16px}
footer{max-width:720px;margin:0 auto 32px;padding:0 24px;color:#86868b;font-size:14px}