/* Shared navigation: destination links and separate submenu controls. */
.top-nav .nav-dropdown {gap: 4px; padding-bottom: 0; margin-bottom: 0;}
.top-nav .nav-dropdown::after {height: 20px;}
.nav-submenu-toggle {display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 30px; padding: 7px; border: 0; background: transparent; color: #bba9dd; cursor: pointer;}
.nav-submenu-toggle svg {width: 10px; height: 8px; fill: none; stroke: currentColor; stroke-width: 1.3; transition: transform .2s;}
.nav-submenu-toggle[aria-expanded="true"] svg {transform: rotate(180deg);}
.top-nav .nav-dropdown-menu,
.top-nav .nav-dropdown:is(:hover,:focus-within) .nav-dropdown-menu {top: calc(100% + 10px); opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(6px); transition: opacity .18s, transform .18s, visibility .18s;}
.top-nav .nav-dropdown.is-open .nav-dropdown-menu {opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0);}
.top-nav :is(a,button):focus-visible {outline: 2px solid #bba9dd; outline-offset: 5px;}
@media (max-width: 820px) {
  .topbar .top-nav {overflow-y: auto; overscroll-behavior: contain; gap: 22px;}
  .top-nav .nav-dropdown {display: grid; grid-template-columns: auto 44px; gap: 0 10px; align-items: center;}
  .top-nav .nav-dropdown::after {display: none;}
  .nav-submenu-toggle {width: 44px; height: 44px; padding: 14px;}
  .top-nav .nav-dropdown-menu,
  .top-nav .nav-dropdown:is(:hover,:focus-within) .nav-dropdown-menu {position: static; grid-column: 1/-1; display: none; min-width: 0; padding: 10px 0 0 15px; border: 0; border-left: 1px solid rgba(187,169,221,.3); background: transparent; box-shadow: none; backdrop-filter: none; transform: none;}
  .top-nav .nav-dropdown.is-open .nav-dropdown-menu {display: flex;}
  .top-nav .nav-dropdown-menu a {padding: 12px 10px; font-size: 16px; letter-spacing: 0; text-transform: none;}
}
@media (prefers-reduced-motion: reduce) {
  .top-nav .nav-dropdown-menu,.nav-submenu-toggle svg {transition: none;}
}