@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

.hello-world {
  color: white;
  font-size: 3.5rem;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
  animation: fadeInUp 0.8s ease-out forwards;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}