:root{
  --ink:#102033;
  --muted:#54657a;
  --line:rgba(31,70,110,.12);
  --bg:#f6fbff;
  --card:#ffffff;
  --accent:#1595d3;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:linear-gradient(180deg,#eef7ff 0%,#f9fcff 35%,#ffffff 100%);
  line-height:1.65;
}
a{color:#0f7fb6;text-decoration:none}
a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{
  outline:3px solid var(--accent);
  outline-offset:3px;
}
.shell{max-width:980px;margin:0 auto;padding:24px}
.topbar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-bottom:24px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
}
.brand-mark{
  width:38px;
  height:38px;
  border-radius:11px;
  display:grid;
  place-items:center;
  background:rgba(255,255,255,.98);
  border:1px solid rgba(16,118,170,.2);
  box-shadow:0 8px 20px rgba(36,110,165,.14);
}
.brand-mark img{
  width:84%;
  height:84%;
  object-fit:contain;
}
.brand-logo{
  display:block;
  height:31px;
  width:auto;
  max-width:230px;
  object-fit:contain;
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:999px;
  padding:10px 16px;
  border:1px solid var(--line);
  background:#fff;
  font-weight:700;
}
.hero{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:22px;
  padding:26px;
  box-shadow:0 16px 40px rgba(22,43,73,.08);
}
.hero h1{margin:0 0 10px;font-size:clamp(1.8rem,4.2vw,2.8rem);line-height:1.15}
.hero p{margin:0;color:var(--muted)}
.card{
  margin-top:18px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:22px;
  padding:24px;
}
.card h2{margin:0 0 12px;font-size:1.28rem}
.card p,.card li{color:#35485c}
.card ul{margin:10px 0 0 18px}
.grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}
.block{
  border:1px solid var(--line);
  border-radius:16px;
  padding:14px;
  background:#fbfdff;
}
.hint{
  margin-top:14px;
  padding:12px 14px;
  border-radius:14px;
  background:#f2fbff;
  border:1px solid #cfefff;
  color:#2e556f;
}
.placeholder{
  color:#9a3d00;
  background:#fff4eb;
  border:1px dashed #ffc7a6;
  padding:1px 7px;
  border-radius:8px;
}
.footer{
  margin:22px 0 8px;
  color:var(--muted);
  font-size:.94rem;
}
@media (max-width:760px){
  .shell{padding:16px}
  .grid{grid-template-columns:1fr}
  .brand-logo{height:26px;max-width:180px}
}