* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1F2937, #2563EB);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #1F2937;
}

.card {
  background: #ffffff;
  border-radius: 16px;
  padding: 40px 48px;
  max-width: 480px;
  width: 90%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
  text-align: center;
}

h1 {
  font-size: 1.6rem;
  margin-bottom: 8px;
}

p {
  color: #374151;
  line-height: 1.5;
}

code {
  background: #f3f4f6;
  padding: 2px 6px;
  border-radius: 4px;
  color: #2563EB;
}

.info {
  margin-top: 24px;
  padding: 20px;
  background: #f9fafb;
  border-radius: 10px;
}

button {
  margin-top: 12px;
  background: #2563EB;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
}

button:hover {
  background: #1d4ed8;
}

footer {
  margin-top: 28px;
  font-size: 0.8rem;
  color: #6B7280;
}