:root{
  --bg:#f4f7fb;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --accent:#0ea5e9;
  --accent2:#2563eb;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:Segoe UI,Arial,sans-serif;
  background:linear-gradient(135deg,#eaf2ff 0%,#f8fbff 45%,#f1f5ff 100%);
  color:var(--text);
}
.wrap{max-width:980px;margin:0 auto;padding:32px 20px}
.nav{
  background:rgba(255,255,255,.7);
  border:1px solid #dbeafe;
  border-radius:14px;
  padding:12px 16px;
  backdrop-filter: blur(6px);
}
.nav a{
  margin-right:14px;
  text-decoration:none;
  color:#1d4ed8;
  font-weight:600;
}
.hero,.card{
  margin-top:20px;
  background:var(--card);
  border:1px solid #e2e8f0;
  border-radius:18px;
  padding:28px;
  box-shadow:0 10px 30px rgba(2,6,23,.06);
}
h1{margin:0 0 12px;font-size:clamp(28px,4vw,44px)}
p{margin:0 0 12px;color:var(--muted);line-height:1.6}
.btn{
  display:inline-block;
  margin-top:12px;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  color:#fff;text-decoration:none;font-weight:700;
  padding:10px 16px;border-radius:10px
}
.footer{margin-top:24px;color:#64748b;font-size:14px}
.center{text-align:center}
img.err{max-width:420px;width:90%;border-radius:14px;border:1px solid #cbd5e1}