@media (max-width: 768px) {

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .main-nav {
    display: none;
  }

  .main-nav.open {
    display: block;
    position: absolute;
    top: 70px;
    right: 0;
    background: #ffffff;
    width: 200px;
    border: 1px solid #e5e5e5;
  }

  .main-nav ul {
    flex-direction: column;
    padding: 1rem;
  }

  .nav-toggle {
    display: block;
  }
}