* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(135deg, #4f46e5, #3b82f6);
  color: #111827;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  color: white;
  padding: 1.5rem;
  font-size: 1.5rem;
}

main {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.card {
  background: white;
  padding: 2rem 3rem;
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
  text-align: center;
  max-width: 400px;
}

.card h2 {
  margin-bottom: 1rem;
  color: #1e3a8a;
}

.card p {
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

button {
  background-color: #2563eb;
  color: white;
  border: none;
  padding: 0.7rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background-color: #1d4ed8;
}

footer {
  text-align: center;
  padding: 1rem;
  color: white;
  font-size: 0.9rem;
}