/* Mobile/tablet navigation override: keep every primary Pi Lab tab reachable. */
@media (max-width: 900px) {
  header {
    gap: 12px;
    overflow: hidden;
  }

  header nav {
    display: flex;
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
    gap: 4px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 4px 0;
  }

  header nav::-webkit-scrollbar {
    display: none;
  }

  header nav button,
  header nav button:nth-child(2) {
    display: inline-flex !important;
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .student {
    flex: 0 0 auto;
  }
}

@media (max-width: 620px) {
  header {
    height: auto;
    min-height: 66px;
    padding: 8px 12px;
    align-items: center;
  }

  .brand {
    flex: 0 0 auto;
    font-size: 17px;
  }

  .brand-mark {
    height: 26px;
  }

  header nav {
    order: 2;
    flex-basis: 100%;
    width: 100%;
    padding-bottom: 2px;
  }

  header nav button {
    min-height: 38px;
    padding: 8px 12px;
  }

  .student {
    display: none;
  }
}