:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: #0b1220; color: #e8eefc;
}
.card {
  max-width: 40rem; width: calc(100% - 2rem); padding: 2rem 1.5rem; text-align: center;
  border: 1px solid #243047; border-radius: 16px;
  background: linear-gradient(180deg, #121a2b, #0e1524);
  box-shadow: 0 20px 50px rgba(0,0,0,.35);
}
h1 { margin: 0 0 .5rem; font-size: 1.6rem; }
p { margin: .45rem 0; line-height: 1.55; color: #a9b7d6; }
.muted { font-size: .9rem; }
.badge {
  display: inline-block; margin-bottom: 1rem; padding: .25rem .65rem;
  border-radius: 999px; font-size: .75rem; font-weight: 600;
  background: #1d4ed8; color: #fff;
}
a { color: #93c5fd; text-decoration: none; }
a:hover { text-decoration: underline; }
.nav { display: flex; flex-wrap: wrap; gap: .5rem; justify-content: center; margin-top: 1.25rem; }
.nav a {
  border: 1px solid #2a3a58; border-radius: 999px; padding: .35rem .75rem;
  font-size: .8rem; color: #c7d2fe; background: #111827;
}