:root {
  --rt-blue: #003087;
  --rt-blue-strong: #00266d;
  --rt-bg: #f4f7fb;
  --rt-text: #153055;
  --rt-line: #c4d1e6;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 50% -20%, #e9f1ff 0%, var(--rt-bg) 46%, #edf2fa 100%);
  color: var(--rt-text);
  font-family: "Yu Gothic", "Meiryo", sans-serif;
  line-height: 1.62;
}
a { color: #003ea8; }
a:hover { color: #0e63d8; }
header {
  background: #fff;
  border-bottom: 2px solid var(--rt-blue);
  box-shadow: 0 2px 10px rgba(0, 34, 90, 0.13);
  padding: 8px 16px 10px;
  text-align: center;
}
header img { max-width: 100%; height: auto; }
main { max-width: 1120px; margin: 18px auto 48px; padding: 0 14px; }
.card {
  background: #fff;
  border: 1px solid #d4dff1;
  border-radius: 12px;
  padding: 24px 14px;
  box-shadow: 0 10px 24px rgba(24, 49, 89, 0.08);
  text-align: center;
}
.card .hero { max-width: 100%; height: auto; }
h1 { margin: 16px 0 4px; color: var(--rt-blue-strong); font-size: clamp(1.2rem, 2.8vw, 1.9rem); }
.company { font-weight: bold; color: var(--rt-blue); font-size: 1.15rem; }
.redirect {
  display: inline-block;
  margin-top: 18px;
  padding: 12px 18px;
  border: 1px solid #cfdaee;
  border-radius: 12px;
  background: linear-gradient(135deg, #fff 0%, #f0f5ff 100%);
}
footer {
  border-top: 2px solid var(--rt-blue);
  background: var(--rt-blue);
  color: #fff;
  text-align: center;
  padding: 14px;
  font-size: 13px;
}