/* Shared mobile left drawer, desktop navigation retained. */
.eb-unified-toc{display:none}#chapter .reader-mobile-toc,#chapter .slide-toggler,#grammar .slide-toggler{display:none!important}
#offcanvasMenu{width:min(340px,88vw);background:#fff;color:#121c30}
#offcanvasMenu .offcanvas-header{border-bottom:1px solid #dce2ee;padding:20px}
#offcanvasMenu .offcanvas-title{font-size:18px;font-weight:700;color:#121c30}
#offcanvasMenu .offcanvas-body{padding:16px;overscroll-behavior:contain}
#offcanvasMenu .toc-head{color:#121c30!important;background:transparent!important}
#offcanvasMenu .toc-units button.on{color:#2450df!important;border-left-color:#2450df!important;background:#edf2ff!important}
#offcanvasMenu .toc-units button::before{color:#2450df!important}
@media(max-width:767px){#chapter .eb-unified-toc,#grammar .eb-unified-toc{display:inline-flex!important;align-items:center;gap:8px;padding:10px 15px;margin:0 0 20px;min-height:44px;border:1px solid #dce2ee;border-radius:8px;background:#fff;color:#2450df;font-size:14px;font-weight:700}#chapter.ebnew .button-container,#chapter.ebnew .button-container.reader-toc-open,#grammar .button-container{display:none!important}}

#offcanvasMenu .offcanvas-header{display:flex!important;justify-content:space-between!important}#offcanvasMenu .btn-close{display:block!important;position:relative!important;flex:0 0 32px!important;width:32px!important;height:32px!important;margin:0!important;padding:0!important;background:none!important;opacity:1!important;border:0!important}#offcanvasMenu .btn-close:before{content:"×";font-size:30px;font-weight:400;color:#59667b;line-height:30px}body:has(#offcanvasMenu.show) #kakao-chat-btn{display:none!important}

/* Edge tab: fixed outside document flow, matching the original grammar navigation. */
@media(max-width:767px){#chapter .eb-unified-toc,#grammar .eb-unified-toc{position:fixed!important;left:0!important;top:50%!important;transform:translateY(-50%);z-index:1030;display:flex!important;flex-direction:column;justify-content:center;gap:0;width:30px!important;height:60px!important;min-height:60px;margin:0!important;padding:8px 0!important;border:0;border-radius:0 6px 6px 0;background:#2450df;color:#fff;font-size:14px;line-height:20px;box-shadow:none}body:has(#offcanvasMenu.show) .eb-unified-toc{visibility:hidden;pointer-events:none}.eb-unified-toc:focus-visible{outline:2px solid #121c30;outline-offset:3px}}