:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #090a0c;
  color: #f5f2e9;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at 50% 10%, rgba(189, 154, 82, 0.18), transparent 36rem),
    #090a0c;
}

main {
  width: min(100%, 34rem);
  padding: clamp(32px, 8vw, 64px);
  border: 1px solid rgba(224, 195, 128, 0.24);
  border-radius: 24px;
  background: rgba(17, 18, 21, 0.92);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
  text-align: center;
}

.mark {
  width: 46px;
  height: 46px;
  margin: 0 auto 28px;
  display: grid;
  place-items: center;
  border: 1px solid #d9b96f;
  border-radius: 50%;
  color: #d9b96f;
  font-weight: 700;
  letter-spacing: 0.08em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 8vw, 3.25rem);
  line-height: 0.98;
  letter-spacing: -0.05em;
}

p {
  margin: 20px auto 30px;
  color: #aaa69c;
  line-height: 1.6;
}

a {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
  border-radius: 999px;
  background: #d9b96f;
  color: #15120c;
  font-weight: 750;
  text-decoration: none;
}

a:focus-visible { outline: 3px solid #f5f2e9; outline-offset: 4px; }

#invalid { color: #e5a3a3; }