@media (max-width: 900px) {
  .topbar .container {
    position: relative;
  }

  .topbar .nav.mobile-open {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    left: 0;
    z-index: 40;
    display: flex;
    max-height: calc(100vh - 96px);
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    overflow-y: auto;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #0d131ceF;
    box-shadow: 0 24px 60px #000a;
    backdrop-filter: blur(18px);
  }

  .topbar .nav.mobile-open a,
  .topbar .nav.mobile-open form,
  .topbar .nav.mobile-open button {
    width: 100%;
  }

  .topbar .nav.mobile-open a {
    display: flex;
    min-height: 44px;
    align-items: center;
    padding: 9px 12px;
    border-radius: 9px;
  }

  .topbar .nav.mobile-open a:hover,
  .topbar .nav.mobile-open a[aria-current="page"] {
    background: #7c3aed20;
  }

  .mobile-toggle {
    gap: 9px;
  }

  .mobile-menu-icon {
    width: 18px;
    height: 12px;
    border-top: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    position: relative;
  }

  .mobile-menu-icon::after {
    content: "";
    position: absolute;
    top: 4px;
    right: 0;
    left: 0;
    border-top: 2px solid currentColor;
  }

  .mobile-toggle.is-open .mobile-menu-icon {
    height: 18px;
    border: 0;
  }

  .mobile-toggle.is-open .mobile-menu-icon::before,
  .mobile-toggle.is-open .mobile-menu-icon::after {
    content: "";
    position: absolute;
    top: 8px;
    right: 0;
    left: 0;
    border-top: 2px solid currentColor;
    transform: rotate(45deg);
  }

  .mobile-toggle.is-open .mobile-menu-icon::after {
    transform: rotate(-45deg);
  }
}

@media (max-width: 420px) {
  .mobile-toggle [data-menu-label] {
    display: none;
  }
}