@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero p {
    font-size: 1rem;
  }
  .category-filters {
    gap: 0.5rem;
  }
  .filter-btn {
    padding: 0.4rem 1rem;
    font-size: 0.9rem;
  }
  .grid {
    grid-template-columns: 1fr;
  }
  #backToTop {
    bottom: 20px;
    right: 20px;
  }
}