:root {
  color-scheme: light dark;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #f8fafc, #e2e8f0);
}

.container {
  width: min(90vw, 700px);
  padding: 2rem;
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.85);
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.2);
  text-align: center;
}

h1 {
  margin-top: 0;
}

button {
  border: none;
  border-radius: 0.5rem;
  padding: 0.7rem 1.2rem;
  font-weight: 600;
  cursor: pointer;
  background: #2563eb;
  color: white;
}

#message {
  margin-top: 1rem;
  min-height: 1.5rem;
  color: #0f172a;
}