@media (max-width: 800px) {
  .nav-links.is-open {
    display: flex;
    position: absolute;
    inset: 0;
    min-height: 100vh;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 30px;
    margin: 0;
    background: #183126;
  }
  .nav-links.is-open a { font: 500 30px var(--serif); }
}