:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #172033;
  background: #eef2f7;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background:
    radial-gradient(circle at 15% 20%, rgba(59, 130, 246, 0.16), transparent 32rem),
    radial-gradient(circle at 85% 80%, rgba(16, 185, 129, 0.13), transparent 30rem),
    #eef2f7;
}

.card {
  width: min(34rem, 100%);
  padding: 3.5rem 2rem;
  text-align: center;
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 1.5rem 4rem rgba(15, 23, 42, 0.12);
  backdrop-filter: blur(0.75rem);
}

.mark {
  display: grid;
  place-items: center;
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1.25rem;
  border-radius: 1rem;
  color: #ffffff;
  background: linear-gradient(135deg, #2563eb, #059669);
  font-size: 1.25rem;
  font-weight: 750;
  letter-spacing: -0.04em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.045em;
}

p {
  margin: 1rem 0 0;
  color: #526077;
  font-size: 1.05rem;
  line-height: 1.6;
}

a {
  display: inline-block;
  margin-top: 1.5rem;
  color: #1d4ed8;
  text-underline-offset: 0.2em;
}

@media (prefers-color-scheme: dark) {
  :root {
    color: #e5edf8;
    background: #0b1220;
  }

  body {
    background:
      radial-gradient(circle at 15% 20%, rgba(37, 99, 235, 0.24), transparent 32rem),
      radial-gradient(circle at 85% 80%, rgba(5, 150, 105, 0.18), transparent 30rem),
      #0b1220;
  }

  .card {
    border-color: rgba(100, 116, 139, 0.4);
    background: rgba(17, 24, 39, 0.86);
    box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.32);
  }

  p {
    color: #a9b7ca;
  }

  a {
    color: #7db3ff;
  }
}