* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  color: #f5f7fb;
  background:
    radial-gradient(circle at 50% 25%, rgba(0,170,220,.12), transparent 34%),
    radial-gradient(circle at 68% 40%, rgba(145,50,220,.09), transparent 32%),
    linear-gradient(145deg, #020713 0%, #06101f 50%, #01040b 100%);
}
.page {
  width: min(1080px, 92vw);
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 42px 20px;
  text-align: center;
}
.logo {
  width: min(720px, 88vw);
  max-height: 48vh;
  object-fit: contain;
  margin-bottom: 22px;
  filter: drop-shadow(0 12px 28px rgba(0,0,0,.35));
}
.prompt {
  font-size: clamp(18px, 2.1vw, 29px);
  margin: 6px 0 28px;
  font-weight: 400;
}
.buttons {
  width: min(730px, 92vw);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 42px;
}
.button {
  display: block;
  padding: 25px 18px;
  border: 1px solid transparent;
  border-radius: 12px;
  color: white;
  text-decoration: none;
  font-size: clamp(20px, 2vw, 28px);
  letter-spacing: .03em;
  background:
    linear-gradient(#06101f, #06101f) padding-box,
    linear-gradient(100deg, #00d9e8, #3f7cff, #c13cff) border-box;
  box-shadow: 0 0 22px rgba(43,117,255,.08);
  transition: transform .15s ease, box-shadow .15s ease;
}
.button:hover, .button:focus {
  transform: translateY(-2px);
  box-shadow: 0 0 26px rgba(55,130,255,.22);
  outline: none;
}
.divider {
  width: min(820px, 88vw);
  height: 1px;
  margin: 45px 0 28px;
  background: linear-gradient(90deg, transparent, #00d9e8, #586fff, #bd3cff, transparent);
}
.notice {
  margin: 0;
  font-size: clamp(18px, 2vw, 28px);
  line-height: 1.55;
}
.subpage .logo { width: min(620px, 84vw); margin-bottom: 28px; }
.subpage h1 { font-size: clamp(28px, 4vw, 46px); margin: 0 0 18px; }
.subpage p { max-width: 760px; font-size: clamp(18px, 2vw, 24px); line-height: 1.55; margin: 8px 0; }
.back { margin-top: 28px; color: #b9dcff; }
@media (max-width: 650px) {
  .buttons { grid-template-columns: 1fr; gap: 18px; }
  .page { padding: 28px 16px; }
  .logo { width: 94vw; }
  .divider { margin-top: 32px; }
}