/* Final responsive refinements discovered during visual QA. */
@media (max-width: 900px) {
  .site-header { background: rgba(255, 254, 250, .96); backdrop-filter: blur(16px); }
  .nav-toggle { position: relative; z-index: 103; }
  .primary-nav { z-index: 102; background: #fffefa; }
  body.nav-open main::before {
    content: '';
    position: fixed;
    z-index: 90;
    inset: 72px 0 0;
    background: rgba(7, 60, 41, .20);
    backdrop-filter: blur(2px);
  }
}