:root{
  --bg:#f7f9fc;
  --card:#ffffff;
  --accent:#0b63d6;
  --muted:#6b7280;
  --radius:12px;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:Inter,Segoe UI,Roboto,Arial,Helvetica,sans-serif;
  background:var(--bg);
  color:#111827;
}
.container{
  max-width:900px;
  margin:28px auto;
  padding:20px;
}
.header{
  text-align:center;
  margin-bottom:18px;
}
.logo{
  width:84px;
  height:auto;
  display:block;
  margin:0 auto 10px;
}
h1{margin:6px 0}
.subtitle{color:var(--muted);margin:0}
.card{
  background:var(--card);
  border-radius:var(--radius);
  box-shadow:0 6px 18px rgba(15,23,42,0.06);
  padding:18px;
  margin:16px 0;
}
.card h2{margin:0 0 8px}
.footer{color:var(--muted);text-align:center;margin-top:18px;font-size:13px}
a{color:var(--accent)}

@media (max-width:520px){
  .container{padding:12px;margin:18px}
  .logo{width:64px}
}