@media (max-width: 850px) {
  .nav.open {
    display: flex;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 10px 20px #102c3c18;
    padding: 18px 6%;
    flex-direction: column;
    gap: 16px;
  }
}