.learning-shell{display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;padding:10px max(12px,env(safe-area-inset-left));background:#173e50;color:white;position:relative;z-index:5}
.learning-shell a,.learning-shell button{color:#fff;background:#25566b;border:1px solid #779aaa;border-radius:9px;padding:9px 12px;text-decoration:none;font:600 14px system-ui;cursor:pointer}
.learning-shell :focus-visible{outline:3px solid #ffd567;outline-offset:3px}
@media print{.learning-shell,.rk-guide-bar{display:none!important}}