:root{
  --blue:#13518f;
  --blue-dark:#0d3a66;
  --orange:#f29400;
  --orange-dark:#d97f00;
  --ink:#1c2733;
  --muted:#5b6875;
  --bg:#f5f7fa;
  --line:#e2e8f0;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:var(--blue)}
a:hover{color:var(--orange-dark)}
.wrap{max-width:860px;margin:0 auto;padding:0 22px}

header{background:#fff;border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:1.18rem;color:var(--blue-dark);text-decoration:none}
.brand small{display:block;font-size:.66rem;font-weight:600;letter-spacing:.14em;color:var(--orange-dark);text-transform:uppercase}
.logo{width:42px;height:42px;border-radius:11px;background:linear-gradient(135deg,var(--blue),var(--blue-dark));
  display:flex;align-items:center;justify-content:center;flex-shrink:0}
.back{font-weight:600;font-size:.95rem;text-decoration:none}

main{background:#fff;border:1px solid var(--line);border-radius:14px;margin:38px auto 48px;padding:44px 48px}
h1{font-size:2rem;line-height:1.2;color:var(--blue-dark);margin-bottom:8px}
h2{font-size:1.15rem;color:var(--blue-dark);margin:30px 0 8px}
p,ul,ol{margin-bottom:12px}
ul,ol{padding-left:22px}
.stand{color:var(--muted);font-size:.9rem;margin-bottom:24px}

.nf{text-align:center;padding:30px 0}
.nf .code{font-size:5rem;font-weight:800;color:var(--orange);line-height:1;margin-bottom:10px}
.btn{display:inline-block;margin-top:18px;background:var(--orange);color:#fff;font-weight:700;
  padding:13px 26px;border-radius:50px;text-decoration:none}
.btn:hover{background:var(--orange-dark);color:#fff}

footer{color:var(--muted);font-size:.86rem;text-align:center;padding:0 22px 40px}
footer a{color:var(--muted)}

@media(max-width:620px){
  main{padding:28px 22px;margin:22px auto 34px}
  h1{font-size:1.6rem}
  .back{display:none}
}