.mobile-navigation { display: none; }
.mobile-navigation button, #collection-menu button { font-family: var(--sans, sans-serif); color: var(--ink); }
.mobile-navigation button:focus-visible, #collection-menu button:focus-visible { outline: 2px solid var(--accent); outline-offset: -4px; }
#collection-menu { width: min(580px, calc(100% - 32px)); max-width: 580px; max-height: min(780px, calc(100vh - 40px)); max-height: min(780px, calc(100dvh - 40px)); padding: 0; margin: auto; color: var(--ink); background: var(--surface); border: 1px solid var(--muted); box-shadow: 0 24px 80px #0006; overflow: auto; overscroll-behavior: contain; }
#collection-menu::backdrop { background: #0009; backdrop-filter: blur(5px); }
#collection-menu .collection-menu-header { position: sticky; top: 0; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 18px 20px; background: var(--surface); border-bottom: 1px solid var(--muted); }
#collection-menu-title { margin: 0; font: 600 23px/1.3 var(--sans, sans-serif); overflow-wrap: anywhere; }
#collection-menu #close-collections { flex: 0 0 44px; width: 44px; min-height: 44px; background: transparent; border: 1px solid var(--muted); font-size: 28px; line-height: 1; }
#collection-menu-items { padding: 12px 20px 20px; }
#collection-menu .collection-menu-shortcuts, #collection-menu .collection-menu-group { margin: 0; padding: 8px 0; }
#collection-menu .collection-menu-group { border-top: 1px solid var(--muted); }
#collection-menu .collection-menu-group h3 { margin: 14px 12px 8px; color: var(--muted); font: 500 13px/1.6 var(--sans, sans-serif); letter-spacing: .35px; }
#collection-menu-items button { display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%; min-height: 48px; padding: 12px; border: 1px solid transparent; background: transparent; text-align: left; font-size: 16px; line-height: 1.5; overflow-wrap: anywhere; }
#collection-menu-items button:hover { border-color: var(--muted); }
#collection-menu-items button[aria-current="page"] { color: var(--accent); border-color: var(--accent); }
#collection-menu-items button[aria-current="page"]::after { content: '✓'; flex-shrink: 0; }
@media (max-width: 1000px) {
 .mobile-navigation { display: flex; position: sticky; top: 68px; z-index: 4; gap: 12px; padding: 10px 24px; align-items: stretch; background: var(--surface); border-bottom: 1px solid var(--muted); }
 .mobile-navigation > button { min-height: 52px; padding: 10px 12px; font-size: 15px; line-height: 1.4; background: var(--surface); border: 1px solid var(--muted); }
 .mobile-navigation > [data-home] { flex: 0 0 auto; }
 .mobile-navigation #mobile-browse { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 2px 10px; flex: 1 1 0; min-width: 0; text-align: left; }
 .mobile-navigation #mobile-browse > span:first-child { font-size: 15px; font-weight: 600; overflow-wrap: anywhere; }
 .mobile-navigation #mobile-current { grid-column: 1; font-size: 12px; line-height: 1.5; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
 .mobile-navigation #mobile-browse > span:last-child { grid-column: 2; grid-row: 1 / 3; font-size: 20px; color: var(--accent); }
}
@media (max-width: 700px) {
 .mobile-navigation { top: 58px; padding: 10px 16px; gap: 8px; }
 #collection-menu .collection-menu-header { padding: 14px 16px; }
 #collection-menu-title { font-size: 21px; }
 #collection-menu-items { padding: 8px 12px 16px; }
}