:root{font-family:system-ui,sans-serif;color:#20354d;background:#f4f7fc}main{max-width:720px;margin:40px auto;padding:28px;background:white;border:1px solid #dce5f2;border-radius:16px}h1{font-size:30px}h2{font-size:20px;margin-top:30px}p{line-height:1.7;color:#4e647b}a{color:#0878de}