body{font-family:system-ui,sans-serif;margin:0;color:#1c2733;background:#f7f9fb}
header{display:flex;gap:12px;align-items:center;padding:14px 22px;background:#123;color:#fff}
main{max-width:720px;margin:40px auto;padding:0 20px}
h1{font-size:28px} ul{line-height:1.8} .muted{color:#7a8a99;font-size:14px}
footer{margin:40px 0;padding:14px 22px;border-top:1px solid #e2e8ee}