@media (max-width: 760px) {
  .site-header { position: relative; }
  nav.is-open {
    display: flex;
    position: absolute;
    z-index: 4;
    top: 69px;
    left: 0;
    right: 0;
    padding: 22px 6%;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }
  .nav-cta { width: 100%; }
}