.submenu {
  left: 50%;
  transform: translateX(-40%);
  width: min(980px, calc(100vw - 32px));
  display: none;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px 10px;
  padding: 12px;
  overflow: auto;
  max-height: min(74vh, 640px);
}

.submenu-group {
  align-content: start;
  min-width: 0;
}

.submenu-title {
  padding: 6px 10px 2px;
  font-size: 10px;
  letter-spacing: 0.1em;
}

.submenu a {
  padding: 7px 10px;
  font-size: 13px;
  line-height: 1.25;
}

.menu-item:hover .submenu,
.menu-item:focus-within .submenu,
.menu-item.submenu-open .submenu {
  display: grid;
}

@media (max-width: 1180px) {
  .submenu {
    transform: translateX(-34%);
    width: min(820px, calc(100vw - 24px));
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 980px) {
  .nav.open .menu .submenu {
    transform: none;
    width: 100%;
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .nav.open .menu .menu-item.submenu-open .submenu {
    display: flex;
  }
}