:root {
  --card-bg: rgba(255,255,255,0.88);
  --card-border: rgba(0,0,0,0.06);
  --text-strong: #0b2a4a;
  --text-soft: #1b365d;
  --link: #0b63d1;
  --link-hover: #094fa7;
  --gradient-top: #1e90ff;
  --gradient-bottom: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --card-bg: rgba(12,22,40,0.78);
    --card-border: rgba(255,255,255,0.08);
    --text-strong: #e9f0ff;
    --text-soft: #c8d7ff;
    --link: #3b82f6;
    --link-hover: #2563eb;
    --gradient-top: #0b1b33;
    --gradient-bottom: #0e2a56;
  }
}

body {
  margin: 0;
  min-height: 100svh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(to bottom, var(--gradient-top), var(--gradient-bottom));
  font-family: "Poppins", system-ui, sans-serif;
}

.card {
  width: min(92vw, 720px);
  padding: clamp(16px, 4vw, 36px);
  background: var(--card-bg);
  backdrop-filter: blur(4px);
  border: 1px solid var(--card-border);
  border-radius: 24px;
  box-shadow: 0 12px 36px rgba(0,0,0,0.18);
  text-align: center;
}

.logo {
  display: block;
  margin: 0 auto 20px;
  width: min(70%, 360px);
  height: auto;
}

h1 {
  font-size: 20px;
  font-weight: 600;
  margin: 8px 0 10px;
  line-height: 1.25;
  color: var(--text-strong);
}

p.subline {
  font-size: 15px;
  font-weight: 300;
  margin: 0 0 18px;
  color: var(--text-soft);
}

h2 {
  font-size: 18px;
  margin-top: 24px;
  margin-bottom: 8px;
  color: var(--text-strong);
}

p {
  margin: 0 0 12px;
}

footer {
  margin-top: 20px;
  font-size: 14px;
}

footer a {
  color: var(--link);
  text-decoration: none;
  margin: 0 6px;
}

footer a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}