:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #090b0f;
  color: #f4f7fb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 50% 38%, rgb(38 63 101 / 18%), transparent 27rem),
    #090b0f;
}

main {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.25rem;
}

.card {
  width: min(100%, 25rem);
  padding: clamp(2rem, 7vw, 2.75rem);
  border: 1px solid #252a33;
  border-radius: 0.875rem;
  background: #11141a;
  box-shadow: 0 1.5rem 4rem rgb(0 0 0 / 42%);
  text-align: center;
}

.brand {
  margin: 0 0 1.75rem;
  color: #8791a2;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.24em;
}

h1 {
  margin: 0;
  font-size: clamp(1.8rem, 8vw, 2.25rem);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.subtitle {
  margin: 0.8rem auto 2rem;
  color: #9aa3b2;
  font-size: 0.95rem;
  line-height: 1.55;
  text-wrap: balance;
}

.app-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.7rem 1rem;
  border: 1px solid #377ee9;
  border-radius: 0.5rem;
  background: #2868c7;
  color: #fff;
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
  transition: background-color 140ms ease, border-color 140ms ease;
}

.app-link:hover { background: #3277dc; border-color: #4c8ced; }
.app-link:focus-visible { outline: 3px solid rgb(76 140 237 / 42%); outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  .app-link { transition: none; }
}