/* Two-column navigation only on tablets and phones; desktop remains unchanged. */
@media (max-width:900px){
  body.box-mobile-split .layout{display:grid;grid-template-columns:minmax(150px,34vw) minmax(0,1fr);align-items:start;gap:0;width:100%;max-width:100%;padding:0;}
  body.box-mobile-split .left-menu{position:sticky;top:59px;width:100%;height:calc(100vh - 59px);max-height:calc(100vh - 59px);overflow-y:auto;overflow-x:hidden;border-right:3px solid #7a7a7a;border-bottom:0;padding:10px 0 14px;z-index:20;}
  body.box-mobile-split .left-menu .home-button,body.box-mobile-split .left-menu .lang-switch,body.box-mobile-split .left-menu>h2,body.box-mobile-split .left-menu .author-photo,body.box-mobile-split .left-menu .flagbox{display:none;}
  body.box-mobile-split .heritage-menu{padding:0 9px;}
  body.box-mobile-split .heritage-menu li{align-items:flex-start;gap:5px;padding:9px 2px;}
  body.box-mobile-split .heritage-menu li span{flex:0 0 auto;font-size:12px;line-height:1.35;}
  body.box-mobile-split .heritage-menu a{display:block;min-width:0;font-size:clamp(12px,2.15vw,16px);line-height:1.25;overflow-wrap:anywhere;}
  body.box-mobile-split .content-page{min-width:0;width:100%;padding:12px 8px;}
  body.box-mobile-split .content-card{min-width:0;width:100%;padding:20px 12px;border-radius:10px;}
}
@media (max-width:480px){
  body.box-mobile-split .layout{grid-template-columns:minmax(128px,42vw) minmax(0,1fr);}
  body.box-mobile-split .heritage-menu{padding:0 6px;}
  body.box-mobile-split .heritage-menu li{gap:3px;padding:8px 1px;}
  body.box-mobile-split .heritage-menu a{font-size:12px;}
  body.box-mobile-split .content-page{padding:8px 5px;}
  body.box-mobile-split .content-card{padding:16px 9px;}
}