body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #0d1117;
  color: #f8f8ff;
  font-family: system-ui, sans-serif;
}

.card {
  max-width: 50rem;
  padding: 2rem;
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(18px);
}

h1 {
  margin-top: 0;
  font-size: clamp(1.8rem, 4vw, 2.75rem);
}

p {
  line-height: 1.65;
  margin: 0.9rem 0;
}

.d-none {
  display: none;
}

.button-container {
  text-align: center;
}