.lsk{background:#e5ebf2;border-radius:6px;display:block;position:relative;overflow:hidden}.lsk:after{content:"";background:linear-gradient(90deg,#0000,#ffffffa8,#0000);animation:1.5s ease-in-out infinite lsk-sweep;position:absolute;inset:0;transform:translate(-100%)}@keyframes lsk-sweep{to{transform:translate(100%)}}@media (prefers-reduced-motion:reduce){.lsk:after{animation:none}}.lsk-xs{height:9px}.lsk-sm{height:12px}.lsk-md{height:15px}.lsk-title{border-radius:10px;height:40px}.lsk-stack{gap:10px;display:grid}.lsk-nav{align-items:center;gap:14px;min-height:44px;display:flex}.lsk-nav .lsk:last-child{margin-left:auto}.lsk-sidebar{gap:10px;display:grid}.lsk-sidebar .lsk-row{align-items:center;gap:10px;min-height:30px;display:flex}.lsk-lesson{gap:16px;display:grid}.lsk-block{gap:10px;margin-top:22px;display:grid}.lsk-card{background:#fff;border:1px solid #e2e8f0;border-radius:14px;padding:18px 20px}.lsk-cards{gap:8px;display:grid}