body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #333;
}
.container {
  background: #fff;
  padding: 2rem 3rem;
  border-radius: 16px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  max-width: 500px;
  width: 90%;
  animation: fadeIn 1s ease-in-out;
}
h1 {
  color: #d32f2f;
  font-size: 1.8rem;
  margin-bottom: 1rem;
}
p {
  font-size: 1rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}
.footer {
  font-size: 0.9rem;
  color: #666;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}