@media (max-width: 760px) {
  .header nav.open {
    display: flex;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    margin: 0;
    padding: 23px 6% 28px;
    background: #102b48;
    flex-direction: column;
    gap: 17px;
  }
  .header nav.open a { opacity: 1; }
}