/* Public navigation: native details retain keyboard and no-JavaScript support. */
.site-header .main-nav-dropdown { position:relative; }
.site-header .main-nav-dropdown > summary { display:flex; align-items:center; gap:7px; padding:9px 0; cursor:pointer; list-style:none; font-weight:600; white-space:nowrap; }
.site-header .main-nav-dropdown > summary::-webkit-details-marker { display:none; }
.site-header .main-nav-dropdown > summary::after { content:""; width:6px; height:6px; border-right:1.5px solid currentColor; border-bottom:1.5px solid currentColor; transform:translateY(-2px) rotate(45deg); transition:transform .15s ease; }
.site-header .main-nav-dropdown[open] > summary::after { transform:translateY(2px) rotate(225deg); }
.site-header .nav > a { padding:9px 0; white-space:nowrap; }
.site-header .main-nav-submenu { position:absolute; top:calc(100% + 8px); right:0; z-index:65; display:grid; gap:3px; width:max-content; min-width:250px; max-width:calc(100vw - 32px); padding:9px; border:1px solid var(--border,var(--line)); border-radius:12px; background:var(--surface,#fff); color:var(--text,#171717); box-shadow:0 16px 40px rgba(0,0,0,.16); }
.site-header .main-nav-submenu a { display:block; padding:11px 12px; border-radius:7px; line-height:1.35; white-space:normal; overflow-wrap:anywhere; }
.site-header .main-nav-submenu a:hover,.site-header .main-nav-submenu a:focus-visible { background:var(--surface-soft,#f5f5f5); }
.site-header .nav a.is-current,.site-header .main-nav-dropdown.is-current-group > summary { font-weight:750; }
.site-header .main-nav-submenu a.is-current { background:var(--surface-soft,#f5f5f5); }
.site-header .main-nav-dropdown > summary:focus-visible,.site-header .nav a:focus-visible { outline:2px solid var(--accent); outline-offset:3px; }
@media(min-width:1101px) {
    .site-header .desktop-nav { flex-wrap:nowrap; gap:18px; }
    .site-header .main-nav-dropdown:first-child .main-nav-submenu { left:0; right:auto; }
}
@media(max-width:1100px) {
    .site-header .desktop-nav { display:none; }
    .site-header .mobile-menu { display:block; margin-left:auto; }
    .site-header .mobile-menu > .nav { width:min(320px,calc(100vw - 32px)); min-width:0; box-sizing:border-box; display:grid; align-items:stretch; gap:3px; padding:10px; max-height:calc(100dvh - 150px); overflow-y:auto; overscroll-behavior:contain; }
    .site-header .mobile-menu .nav > a,.site-header .mobile-menu .main-nav-dropdown > summary { padding:11px 12px; border-radius:7px; }
    .site-header .mobile-menu .main-nav-dropdown > summary { justify-content:space-between; }
    .site-header .mobile-menu .main-nav-submenu { position:static; width:auto; min-width:0; max-width:none; padding:3px 0 6px 12px; border:0; border-left:2px solid var(--accent); border-radius:0; box-shadow:none; margin:0 12px 6px; }
    .site-header .mobile-menu .nav > a:hover,.site-header .mobile-menu .main-nav-dropdown > summary:hover { background:var(--surface-soft,#f5f5f5); }
}
@media(max-width:640px) { .site-header .mobile-menu { margin-left:0; } }
@media(prefers-reduced-motion:reduce) { .site-header .main-nav-dropdown > summary::after { transition:none; } }