body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

.ui-style-13 {
  --primary-color: #3498db;
  --secondary-color: #2c3e50;
  --accent-color: #e74c3c;
  --bg-color: #f5f5f5;
  --card-bg: #ffffff;
  --text-color: #333;
  --border-color: #e0e0e0;
}

article:hover {
  transform: translateY(-2px);
}

a {
  transition: color 0.3s ease;
}

a:hover {
  color: var(--primary-color);
}

@media (max-width: 768px) {
  main {
    padding: 0 15px !important;
  }

  h1 {
    font-size: 24px !important;
  }

  h2 {
    font-size: 20px !important;
  }

  section {
    padding: 20px !important;
  }
}

@media (max-width: 480px) {
  .grid {
    grid-template-columns: 1fr !important;
  }
}