@media screen and (max-width: 1000px) {
  .skills-grid,
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .case-fields {
    grid-template-columns: repeat(2, 1fr);
  }
  .case-field:nth-child(2) {
    border-right: none;
  }
  .case-field:nth-child(3),
  .case-field:nth-child(4) {
    border-top: 1px solid var(--border);
  }
}

@media screen and (max-width: 860px) {
  #desktop-nav {
    display: none;
  }
  #hamburger-nav {
    display: flex;
  }
}

@media screen and (max-width: 640px) {
  .wrap {
    padding: 0 1.25rem;
  }
  .hero {
    padding: 2.5rem 0 2rem;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .case-fields {
    grid-template-columns: 1fr;
  }
  .case-field {
    border-right: none;
    border-top: 1px solid var(--border);
  }
  .case-field:first-child {
    border-top: none;
  }
  .skills-grid,
  .cert-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .timeline-top {
    flex-direction: column;
  }
  footer .wrap {
    flex-direction: column;
    text-align: center;
  }
}