.lk-lesson-player-frame{box-sizing:border-box;width:min(96vw,1280px,calc(92vh * 16 / 9));max-width:100%;aspect-ratio:16/9;margin-inline:auto;overflow:hidden}.lk-lesson-player-frame--fill{max-width:none;aspect-ratio:auto;margin-inline:0}.lk-lesson-player-frame--fill,.lk-lesson-player-root,.lk-lesson-player-root--fill{width:100%;height:100%;min-height:0}.lk-lesson-player-frame .lk-lesson-prejoin{height:100%;min-height:0}.lk-lesson-player-root,.lk-lesson-root{--lk-brand-primary:var(--tp-primary,#ffcb00);--lk-brand-primary-ink:var(--tp-primary-ink,#111111);--lk-brand-primary-soft:var(--tp-primary-soft,#fff9df);--lk-brand-text-muted:var(--tp-text-muted,#71757f);--lk-brand-font:var(
    --tp-font,Lato,"Segoe UI",system-ui,-apple-system,sans-serif
  );--lk-control-size:40px;--lk-control-radius:12px;--lk-field-radius:12px;--lk-chat-radius:12px;--lk-control-gap:8px;--lk-text-xs:var(--tp-text-xs,12px);--lk-text-sm:var(--tp-text-sm,14px);--lk-text-md:var(--tp-text-md,16px);--lk-leading-xs:var(--tp-leading-xs,16px);--lk-leading-sm:var(--tp-leading-sm,20px);--lk-surface-radius:14px;--lk-tile-radius:14px;--lk-panel-width:min(340px,92%);--lk-controls-inset:48px;--lk-stage-gap:10px;--lk-stage-bg:#0f1115;--lk-tile-bg:#10131a;--lk-elevated:var(--tp-bg-dark-elevated,#2b3134);--lk-speaking-ring:color-mix(in srgb,var(--lk-brand-primary) 70%,white);font-family:var(--lk-brand-font)}.lk-lesson-root{position:relative;display:flex;width:100%;height:100%;min-height:0;flex-direction:column;background:var(--lk-stage-bg);overflow:hidden;color:rgba(255,255,255,.92);font-family:var(--lk-brand-font);font-size:var(--lk-text-sm);line-height:var(--lk-leading-sm)}.lk-lesson-root--joining .lk-lesson-stage-wrap{opacity:.55;transition:opacity .4s ease}.lk-lesson-root--joined .lk-lesson-stage-wrap{opacity:1;transition:opacity .45s ease}.lk-lesson-root--joined .lk-lesson-controls-wrap{animation:lk-lesson-chrome-enter .4s ease both}@keyframes lk-lesson-chrome-enter{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.lk-lesson-main{min-width:0;flex:1;flex-direction:column;overflow:hidden}.lk-lesson-body,.lk-lesson-main{position:relative;display:flex;min-height:0}.lk-lesson-body{flex:1}.lk-lesson-panel-overlay{position:absolute;inset:0;z-index:30;pointer-events:none}.lk-lesson-panel-backdrop{position:absolute;inset:0;border:none;margin:0;padding:0;background:rgba(0,0,0,.52);cursor:pointer;pointer-events:auto;animation:lk-lesson-fade-in .18s ease-out}.lk-lesson-aside{position:absolute;top:0;right:0;bottom:0;z-index:1;display:flex;width:var(--lk-panel-width);min-height:0;flex-direction:column;overflow:hidden;border:1px solid rgba(255,255,255,.12);border-radius:var(--lk-surface-radius) 0 0 var(--lk-surface-radius);background:color-mix(in srgb,var(--lk-elevated) 88%,black);color:rgba(255,255,255,.92);box-shadow:-8px 0 32px rgba(0,0,0,.45);pointer-events:auto;animation:lk-lesson-slide-in .22s ease-out;font-family:var(--lk-brand-font)}@keyframes lk-lesson-fade-in{0%{opacity:0}to{opacity:1}}@keyframes lk-lesson-slide-in{0%{opacity:0;transform:translateX(12px)}to{opacity:1;transform:translateX(0)}}.lk-lesson-aside--chat .lk-lesson-panel-body{display:flex;min-height:0;flex-direction:column}.lk-lesson-panel-header{display:flex;flex-shrink:0;align-items:center;justify-content:space-between;gap:8px;padding:10px 12px;border-bottom:1px solid rgba(255,255,255,.08)}.lk-lesson-panel-header .lk-lesson-panel-title{margin:0;padding:0;border-bottom:none}.lk-lesson-panel-close{display:inline-flex;width:32px;height:32px;flex-shrink:0;align-items:center;justify-content:center;border:none;border-radius:var(--lk-field-radius,12px);background:transparent;color:rgba(255,255,255,.75);cursor:pointer}.lk-lesson-panel-close:hover{background:rgba(255,255,255,.1);color:#fff}.lk-lesson-panel-body{overflow:hidden}.lk-lesson-chat-inner,.lk-lesson-panel-body{display:flex;min-height:0;flex:1;flex-direction:column}.lk-lesson-stage-wrap{position:relative;min-width:0;flex:1;min-height:0}.lk-lesson-stage{position:absolute;inset:0}.lk-lesson-stage--grid{display:grid;grid-template-columns:repeat(var(--lk-grid-cols,2),minmax(0,1fr));grid-auto-rows:auto;gap:var(--lk-stage-gap,12px);align-content:center;justify-items:stretch;padding:var(--lk-stage-gap,12px);box-sizing:border-box;width:100%;height:100%}.lk-lesson-stage--grid-scroll{align-content:start;overflow-x:hidden;overflow-y:auto}.lk-lesson-tile-snapshot{position:absolute;inset:0;width:100%;height:100%;-o-object-fit:cover;object-fit:cover;filter:blur(10px);transform:scale(1.06)}.lk-lesson-stage--speaker{display:flex;min-height:0;gap:var(--lk-stage-gap,12px);padding:var(--lk-stage-gap,12px);box-sizing:border-box;width:100%;height:100%}.lk-lesson-stage-main{position:relative;min-width:0;flex:1;min-height:0;overflow:hidden;border-radius:var(--lk-tile-radius,14px)}.lk-lesson-stage-sidebar{display:flex;width:148px;flex-shrink:0;flex-direction:column;gap:var(--lk-stage-gap,12px);padding:0;overflow-x:hidden;overflow-y:auto}.lk-lesson-stage--screen{background:var(--lk-stage-bg,#0f1115)}.lk-lesson-stage-pip{position:absolute;top:12px;right:12px;z-index:4;width:min(32%,220px);filter:drop-shadow(0 4px 16px rgba(0,0,0,.55))}.lk-lesson-stage-screen-strip{position:absolute;right:12px;bottom:12px;left:12px;z-index:3;display:flex;gap:8px;max-width:calc(100% - 24px);padding:4px;overflow-x:auto;border-radius:10px;background:rgba(0,0,0,.55)}.lk-lesson-stage-screen-strip .lk-lesson-tile--compact{width:112px;flex-shrink:0}.lk-lesson-stage--board{display:flex;flex-direction:row;width:100%;height:100%;min-height:0;overflow:hidden;background:#141418}.lk-whiteboard-toolbar{position:relative;z-index:4;display:flex;width:52px;flex-shrink:0;flex-direction:column;align-items:center;gap:6px;padding:10px 6px;border-right:1px solid rgba(255,255,255,.08);background:rgba(0,0,0,.45);overflow:visible}.lk-whiteboard-toolbar-tools{display:flex;flex-direction:column;gap:4px}.lk-whiteboard-toolbar-divider{width:28px;height:1px;flex-shrink:0;background:rgba(255,255,255,.12)}.lk-whiteboard-tool{display:flex;width:var(--lk-control-size,32px);height:var(--lk-control-size,32px);align-items:center;justify-content:center;padding:0;border:none;border-radius:var(--lk-control-radius,8px);background:transparent;color:rgba(255,255,255,.88);cursor:pointer}.lk-whiteboard-tool:hover:not(:disabled){background:rgba(255,255,255,.12)}.lk-whiteboard-tool--active{background:color-mix(in srgb,var(--lk-brand-primary) 70%,transparent);color:var(--lk-brand-primary-ink)}.lk-whiteboard-tool--danger:hover:not(:disabled){background:rgba(239,68,68,.35);color:#fecaca}.lk-whiteboard-tool:disabled{opacity:.35;cursor:not-allowed}.lk-whiteboard-toolbar-anchor{position:relative;flex-shrink:0}.lk-whiteboard-color-trigger{width:28px;height:28px;padding:0;border:2px solid rgba(255,255,255,.35);border-radius:50%;box-shadow:inset 0 0 0 1px rgba(0,0,0,.15);cursor:pointer}.lk-whiteboard-flyout{position:absolute;top:50%;left:calc(100% + 8px);z-index:40;border:1px solid rgba(255,255,255,.12);border-radius:999px;background:rgba(20,20,24,.96);box-shadow:0 4px 20px rgba(0,0,0,.35);transform:translateY(-50%);pointer-events:auto}.lk-whiteboard-palette{display:flex;flex-direction:row;align-items:center;gap:6px;padding:6px 8px}.lk-whiteboard-color{width:22px;height:22px;flex-shrink:0;padding:0;border:2px solid rgba(255,255,255,.2);border-radius:50%;cursor:pointer}.lk-whiteboard-color--active{border-color:#fff;box-shadow:0 0 0 1px rgba(255,255,255,.45)}.lk-whiteboard-width-trigger{display:flex;width:var(--lk-control-size,32px);height:var(--lk-control-size,32px);align-items:center;justify-content:center;padding:0;border:none;border-radius:var(--lk-control-radius,8px);background:rgba(255,255,255,.1);cursor:pointer}.lk-whiteboard-width-trigger:hover{background:rgba(255,255,255,.18)}.lk-whiteboard-width-preview{display:block;width:20px;min-height:2px;border-radius:999px}.lk-whiteboard-width-flyout{display:flex;align-items:center;gap:10px;padding:8px 12px;border-radius:12px}.lk-whiteboard-width-flyout-label{min-width:2ch;color:rgba(255,255,255,.85);font-size:var(--lk-text-xs,12px);font-variant-numeric:tabular-nums}.lk-whiteboard-width-flyout input[type=range]{width:100px;margin:0;accent-color:var(--lk-brand-primary)}.lk-whiteboard-center{position:relative;display:flex;min-width:0;min-height:0;height:100%;flex:1;flex-direction:column;overflow:hidden}.lk-excalidraw-wrap{position:absolute;inset:0;z-index:1;overflow:hidden}.lk-excalidraw-host{position:relative}.lk-excalidraw-host,.lk-excalidraw-host .excalidraw{width:100%;height:100%}.lk-wb-remote-pointers{position:absolute;inset:0;z-index:6;overflow:hidden;pointer-events:none}.lk-wb-remote-pointer{position:absolute;transform:translate(-1px,-1px);will-change:left,top}.lk-wb-remote-pointer__cursor{display:block;filter:drop-shadow(0 1px 2px rgb(0 0 0/55%))}.lk-wb-remote-pointer__laser{position:relative;display:block;width:12px;height:12px}.lk-wb-remote-pointer__dot{width:10px;height:10px;border:2px solid #fff;border-radius:999px;background:var(--lk-wb-pointer,#ef4444);box-shadow:0 0 0 1px rgb(0 0 0/40%),0 0 10px color-mix(in srgb,var(--lk-wb-pointer,#ef4444) 70%,transparent)}.lk-wb-remote-pointer__dot,.lk-wb-remote-pointer__ring{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.lk-wb-remote-pointer__ring{width:28px;height:28px;border:2px solid color-mix(in srgb,var(--lk-wb-pointer,#ef4444) 85%,white);border-radius:999px;animation:lk-wb-pointer-pulse .9s ease-out infinite}.lk-wb-remote-pointer__label{position:absolute;top:16px;left:14px;max-width:9.5rem;overflow:hidden;border:1px solid rgb(255 203 0/90%);border-radius:6px;background:rgb(17 17 17/92%);padding:.15rem .45rem;color:#fff;font-size:12px;font-weight:600;letter-spacing:.01em;line-height:1.35;text-overflow:ellipsis;white-space:nowrap;box-shadow:0 2px 8px rgb(0 0 0/40%)}.lk-wb-remote-pointer--laser .lk-wb-remote-pointer__label{top:14px;left:12px}@keyframes lk-wb-pointer-pulse{0%{opacity:.9;transform:translate(-50%,-50%) scale(.85)}to{opacity:0;transform:translate(-50%,-50%) scale(1.35)}}.lk-excalidraw--lesson .excalidraw .default-sidebar .sidebar-tab-trigger:nth-child(2),.lk-excalidraw--lesson .excalidraw .default-sidebar-trigger,.lk-excalidraw--lesson .excalidraw .layer-ui__library,.lk-excalidraw--lesson .excalidraw .library-menu,.lk-excalidraw--lesson .excalidraw .library-menu-browse-button{display:none!important}.lk-excalidraw-clear-btn{position:absolute;top:.75rem;right:.75rem;z-index:10;border:1px solid rgb(255 255 255/18%);border-radius:.5rem;background:rgb(0 0 0/55%);padding:.4rem .75rem;color:#fff;font-size:var(--lk-text-xs,12px);cursor:pointer}.lk-excalidraw-clear-btn:hover{background:rgb(0 0 0/72%)}.lk-lesson-whiteboard-viewer{height:min(420px,55vh);overflow:hidden;border:1px solid rgb(255 255 255/10%);border-radius:.75rem}.lk-lesson-whiteboard-viewer .excalidraw,.lk-lesson-whiteboard-viewer .lk-excalidraw-host{height:100%}.lk-lesson-whiteboard-viewer__empty{margin:0;padding:1rem 0;color:rgb(255 255 255/55%);font-size:var(--lk-text-sm,14px)}.lk-whiteboard-canvas-layer{display:flex;min-height:0;flex:1;flex-direction:column}.lk-whiteboard-canvas-layer--text-edit .lk-whiteboard-canvas{pointer-events:none}.lk-whiteboard-canvas-wrap{position:relative;min-height:0;flex:1}.lk-whiteboard-canvas{display:block;width:100%;height:100%;touch-action:none;cursor:crosshair;background:#f4f4f5}.lk-whiteboard-canvas--eraser{cursor:cell}.lk-whiteboard-canvas--text{cursor:text}.lk-whiteboard-canvas--select{cursor:default}.lk-whiteboard-text-input{position:absolute;z-index:20;min-width:160px;max-width:min(420px,80%);padding:6px 8px;border:2px solid color-mix(in srgb,var(--lk-brand-primary) 85%,transparent);border-radius:6px;background:#fff;box-shadow:0 4px 20px rgba(0,0,0,.18);font-family:var(--lk-brand-font);pointer-events:auto;resize:none;overflow:hidden;outline:none}.lk-whiteboard-readonly-hint{position:absolute;right:12px;bottom:12px;margin:0;padding:4px 8px;border-radius:6px;background:rgba(0,0,0,.45);color:rgba(255,255,255,.85);font-size:12px;pointer-events:none}.lk-whiteboard-participants-rail{display:flex;width:168px;flex-shrink:0;flex-direction:column;gap:8px;padding:8px;border-left:1px solid rgba(255,255,255,.08);background:rgba(0,0,0,.35);overflow-x:hidden;overflow-y:auto}.lk-whiteboard-participants-rail .lk-lesson-tile--compact{width:100%;flex-shrink:0;aspect-ratio:16/9}.lk-lesson-tile{position:relative;overflow:hidden;min-width:0;min-height:0;border:1px solid rgba(255,255,255,.08);border-radius:var(--lk-tile-radius,18px);background:var(--lk-tile-bg,#10131a);contain:layout paint}.lk-lesson-tile-ratio{display:block;width:100%;margin:0;padding-top:56.25%;pointer-events:none}.lk-lesson-tile-media{position:absolute;inset:0;overflow:hidden;border-radius:inherit}.lk-lesson-stage--grid .lk-lesson-tile{width:100%;max-width:100%;height:auto;align-self:center;justify-self:stretch}.lk-lesson-stage--screen .lk-lesson-stage-pip .lk-lesson-tile,.lk-lesson-stage-main>.lk-lesson-tile{width:100%;height:100%;border-radius:var(--lk-tile-radius,18px)}.lk-lesson-stage-main>.lk-lesson-tile{position:absolute;inset:0}.lk-lesson-tile--compact{flex:0 0 auto;width:100%;height:auto}.lk-lesson-tile--speaking{border-color:transparent;outline:2px solid var(--lk-speaking-ring,#f5c542);outline-offset:-2px;box-shadow:0 0 0 4px color-mix(in srgb,var(--lk-brand-primary) 18%,transparent)}.lk-lesson-tile-video{display:block;width:100%;height:100%;-o-object-fit:cover;object-fit:cover;-o-object-position:center;object-position:center;background:#000;transform:none}.lk-lesson-prejoin [data-lk-local-participant=true] video,.lk-lesson-prejoin [data-lk-source=camera][data-lk-local-participant=true],.lk-lesson-tile--mirror .lk-lesson-tile-video{transform:scaleX(-1)}.lk-lesson-role-badge{display:inline-flex;flex-shrink:0;align-items:center;justify-content:center;width:1.125rem;height:1.125rem;border-radius:4px;font-size:10px;font-weight:700;line-height:1}.lk-lesson-role-badge--teacher{background:var(--lk-brand-primary);color:var(--lk-brand-primary-ink)}.lk-lesson-tile-name{position:absolute;top:12px;right:auto;bottom:auto;left:12px;z-index:1;display:inline-flex;max-width:calc(100% - 24px);align-items:center;gap:8px;padding:7px 10px;border-radius:var(--lk-field-radius,12px);border:1px solid rgba(255,255,255,.08);background:rgba(15,17,21,.72);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);color:rgba(255,255,255,.95);font-size:13px;font-weight:600;line-height:1.2;overflow:hidden}.lk-lesson-tile--compact .lk-lesson-tile-name{top:8px;bottom:auto;left:8px;max-width:calc(100% - 16px);padding:5px 8px;font-size:12px;gap:6px}.lk-lesson-tile-name-text{min-width:0;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lk-lesson-tile-avatar{display:flex;width:100%;height:100%;align-items:center;justify-content:center;background:transparent}.lk-lesson-tile-avatar-initials{display:flex;width:clamp(4.5rem,28%,10rem);aspect-ratio:1;align-items:center;justify-content:center;border-radius:50%;background:linear-gradient(145deg,hsl(var(--lk-avatar-hue,220) 42% 32%),hsl(calc(var(--lk-avatar-hue, 220) + 24) 38% 22%));color:rgba(255,255,255,.92);font-size:clamp(1.125rem,3.2vw,2.25rem);font-weight:600;letter-spacing:.04em;-webkit-user-select:none;-moz-user-select:none;user-select:none;transition:opacity .18s ease}.lk-lesson-tile-avatar--photo{background:transparent}.lk-lesson-tile-avatar-photo{width:clamp(4.5rem,28%,10rem);aspect-ratio:1;height:auto;border-radius:50%;-o-object-fit:cover;object-fit:cover}.lk-lesson-tile-avatar--compact .lk-lesson-tile-avatar-initials{width:clamp(2.75rem,42%,4.5rem);font-size:clamp(.75rem,2.5vw,1.125rem)}.lk-lesson-tile-avatar--compact .lk-lesson-tile-avatar-photo{width:clamp(2.75rem,42%,4.5rem)}.lk-lesson-tile--avatar .lk-lesson-tile-name{background:rgba(15,17,21,.78)}.lk-lesson-tile-moderation{position:absolute;top:6px;right:6px;left:auto;z-index:5;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .15s ease,visibility .15s ease}.lk-lesson-tile--moderatable:focus-within .lk-lesson-tile-moderation,.lk-lesson-tile--moderatable:hover .lk-lesson-tile-moderation,.lk-lesson-tile-moderation:focus-within,.lk-lesson-tile-moderation:has([aria-expanded=true]){opacity:1;visibility:visible;pointer-events:auto}.lk-lesson-tile-moderation .lk-moderation-menu-trigger{background:rgba(0,0,0,.5);color:#fff}.lk-lesson-tile-moderation .lk-moderation-menu-trigger:hover{background:rgba(0,0,0,.72)}.lk-lesson-tile-hand{position:absolute;top:6px;right:6px;z-index:2;display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:6px;background:rgba(220,38,38,.92);color:#fff;box-shadow:0 2px 8px rgba(0,0,0,.35);pointer-events:none;transition:right .15s ease}.lk-lesson-tile--moderatable:focus-within .lk-lesson-tile-hand,.lk-lesson-tile--moderatable:has([aria-expanded=true]) .lk-lesson-tile-hand,.lk-lesson-tile--moderatable:hover .lk-lesson-tile-hand{right:40px}.lk-lesson-tile-hand svg{width:16px;height:16px;stroke:currentColor}.lk-lesson-tile .lk-reaction-participant-badge{position:absolute;bottom:6px;right:6px;z-index:2}.lk-lesson-main-video{width:100%;height:100%;-o-object-fit:contain;object-fit:contain;background:#000}.lk-lesson-placeholder{display:flex;height:100%;align-items:center;justify-content:center;color:rgba(255,255,255,.55);font-size:var(--lk-text-sm,14px)}.lk-lesson-chrome{position:absolute;inset:0;z-index:20;opacity:0;pointer-events:none;transition:opacity .35s ease}.lk-lesson-chrome--visible{opacity:1;pointer-events:none}.lk-lesson-meta{position:absolute;top:0;right:0;left:0;display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:12px 14px 40px;background:linear-gradient(180deg,rgba(0,0,0,.72),transparent);color:#fff}.lk-lesson-meta-title{margin:0;font-size:var(--lk-text-sm);font-weight:600;line-height:1.3;text-shadow:0 1px 2px rgba(0,0,0,.6)}.lk-lesson-meta-sub{margin:2px 0 0;font-size:var(--lk-text-xs);line-height:var(--lk-leading-xs);color:rgba(255,255,255,.75)}.lk-lesson-controls-wrap{position:absolute;right:0;bottom:0;left:0;z-index:2;display:flex;align-items:center;justify-content:center;pointer-events:none;gap:10px;padding:12px 12px 14px;background:linear-gradient(0deg,rgba(15,17,21,.72) 0,rgba(15,17,21,.28) 45%,transparent)}.lk-lesson-controls-group{display:flex;align-items:center;gap:var(--lk-control-gap);pointer-events:auto}.lk-lesson-controls-divider{align-self:center;width:1px;height:22px;flex-shrink:0;margin:0 2px;background:rgba(255,255,255,.22)}.lk-lesson-btn-badge{position:absolute;top:-2px;right:-2px;z-index:1;min-width:16px;padding:0 4px;border-radius:999px;background:var(--lk-brand-primary,#ffcb00);color:var(--lk-brand-primary-ink,#111111);font-size:10px;font-weight:700;line-height:1.2;box-shadow:0 0 0 2px rgba(15,17,21,.9)}.lk-lesson-btn--unread{background:color-mix(in srgb,var(--lk-brand-primary,#ffcb00) 28%,transparent)!important;box-shadow:0 0 0 2px color-mix(in srgb,var(--lk-brand-primary,#ffcb00) 65%,transparent)}.lk-lesson-btn--unread-tick{animation:lk-lesson-unread-pulse .65s ease-in-out 3}.lk-lesson-btn--unread-tick .lk-lesson-btn-badge{animation:lk-lesson-unread-badge-bounce .65s ease-in-out 3}@keyframes lk-lesson-unread-pulse{0%,to{box-shadow:0 0 0 2px color-mix(in srgb,var(--lk-brand-primary,#ffcb00) 70%,transparent),0 0 10px color-mix(in srgb,var(--lk-brand-primary,#ffcb00) 35%,transparent);transform:translateY(0) scale(1)}50%{box-shadow:0 0 0 4px color-mix(in srgb,var(--lk-brand-primary,#ffcb00) 35%,transparent),0 0 18px color-mix(in srgb,var(--lk-brand-primary,#ffcb00) 55%,transparent);transform:translateY(-2px) scale(1.06)}}@keyframes lk-lesson-unread-badge-bounce{0%,to{transform:scale(1)}50%{transform:scale(1.2)}}.lk-lesson-reactions-wrap{position:relative}.lk-lesson-reactions-picker{position:absolute;bottom:calc(100% + 8px);left:50%;z-index:20;display:flex;flex-direction:row;flex-wrap:nowrap;align-items:center;gap:2px;max-width:min(calc(100vw - 3rem),420px);padding:4px 6px;border-radius:999px;background:rgba(0,0,0,.9);overflow-x:auto;overflow-y:hidden;transform:translateX(-50%);scrollbar-width:none}.lk-lesson-reactions-picker::-webkit-scrollbar{display:none}.lk-lesson-reaction-item{flex-shrink:0;padding:4px 6px;border:none;background:transparent;font-size:1.25rem;line-height:1;cursor:pointer}.lk-lesson-reaction-item:hover{transform:scale(1.15)}.lk-lesson-recording-badge{position:absolute;top:calc(16px + env(safe-area-inset-top, 0px));left:50%;z-index:3;display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;background:rgba(220,38,38,.88);color:#fff;font-size:var(--lk-text-xs,12px);font-weight:700;letter-spacing:.02em;transform:translateX(-50%);pointer-events:none}.lk-lesson-recording-dot{width:8px;height:8px;border-radius:50%;background:#fff;animation:lk-lesson-recording-pulse 1.2s ease-in-out infinite}@keyframes lk-lesson-recording-pulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.55;transform:scale(.85)}}.lk-lesson-record-icon--active{color:#fecaca}.lk-lesson-recording-playback{--lk-brand-primary:var(--tp-primary,#ffcb00);--lk-brand-primary-ink:var(--tp-primary-ink,#111111);--lk-brand-text-muted:var(--tp-text-muted,#71757f);--lk-brand-font:var(
    --tp-font,Lato,"Segoe UI",system-ui,-apple-system,sans-serif
  );display:flex;flex-direction:column;gap:.75rem;font-family:var(--lk-brand-font)}.lk-lesson-recording-playback__video{width:100%;max-height:min(50vh,360px);border-radius:8px;background:#000;accent-color:var(--lk-brand-primary)}.lk-lesson-recording-playback__download{align-self:flex-start;font-size:var(--lk-text-sm,14px);font-weight:600;color:var(--lk-brand-primary-ink,var(--tp-primary-ink,#111111));text-decoration:underline;text-underline-offset:3px}.lk-lesson-recording-playback__download:hover{color:color-mix(in srgb,var(--lk-brand-primary-ink,var(--tp-primary-ink,#111111)) 75%,transparent)}.lk-lesson-recording-playback__status{margin:0;font-size:var(--lk-text-sm,14px);color:var(--lk-brand-text-muted,var(--tp-text-muted,#71757f))}.lk-lesson-recording-playback__status--error{color:#b91c1c}.lk-lesson-root--board-open .lk-lesson-controls-wrap{background:none}.lk-lesson-root--board-open .lk-lesson-controls-group{padding:5px 10px;border-radius:999px;background:rgba(20,20,24,.88);box-shadow:0 2px 14px rgba(0,0,0,.2);backdrop-filter:blur(8px)}.lk-lesson-root--board-open .lk-lesson-controls-divider{align-self:center;height:22px;background:rgba(255,255,255,.22)}.lk-lesson-controls-dock{position:relative;z-index:20;flex-shrink:0;display:flex;justify-content:center;padding:10px 12px 12px;border-top:1px solid rgba(255,255,255,.08);background:#171a21}.lk-lesson-controls-dock .lk-lesson-controls-wrap{position:static;width:100%;padding:0;background:none;justify-content:center}.lk-lesson-pip-source{position:fixed;top:0;left:0;z-index:-1;width:640px;height:360px;opacity:.01;pointer-events:none;-o-object-fit:contain;object-fit:contain}.lk-lesson-pip-source--mirror{transform:scaleX(-1)}.lk-lesson-floating-reaction{position:absolute;left:50%;bottom:28%;z-index:4;display:flex;flex-direction:column;align-items:center;gap:2px;animation:lk-lesson-reaction-pop 2.8s ease forwards;pointer-events:none}.lk-lesson-floating-reaction-emoji{font-size:2.5rem}.lk-lesson-floating-reaction-name{padding:2px 8px;border-radius:999px;background:rgba(0,0,0,.65);color:#fff;font-size:var(--lk-text-xs,12px)}@keyframes lk-lesson-reaction-pop{0%{opacity:0;transform:translateX(-50%) translateY(12px) scale(.6)}15%{opacity:1;transform:translateX(-50%) translateY(0) scale(1)}80%{opacity:1}to{opacity:0;transform:translateX(-50%) translateY(-20px) scale(.9)}}.lk-lesson-thumb{position:relative}.lk-lesson-thumb-hand{position:absolute;top:4px;right:4px;font-size:var(--lk-text-sm,14px)}.lk-lesson-panel-title{color:rgba(255,255,255,.9);font-size:var(--lk-text-sm);font-weight:600}.lk-lesson-participant-list{margin:0;padding:8px;list-style:none;overflow-y:auto;flex:1}.lk-lesson-participant-row{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 6px;border-radius:var(--lk-control-radius)}.lk-lesson-participant-row:hover{background:rgba(255,255,255,.06)}.lk-lesson-participant-row--hand{background:rgba(250,204,21,.12)}.lk-lesson-participant-row--hand:hover{background:rgba(250,204,21,.18)}.lk-lesson-participant-name{display:flex;min-width:0;align-items:center;gap:.35rem;overflow:hidden;color:rgba(255,255,255,.92);font-size:var(--lk-text-sm)}.lk-lesson-participant-name-text{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.lk-lesson-participant-main{display:flex;min-width:0;align-items:center;gap:6px}.lk-lesson-hand-badge{flex-shrink:0}.lk-lesson-participant-status{display:flex;flex-shrink:0;align-items:center;gap:4px}.lk-lesson-participant-status-icon{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:6px;color:rgba(255,255,255,.88)}.lk-lesson-participant-status-icon--off{background:rgba(220,38,38,.22);color:#fecaca}.lk-lesson-mic-status{display:inline-flex;flex-shrink:0;align-items:center;justify-content:center;color:rgba(255,255,255,.9)}.lk-lesson-mic-status--off{color:#fecaca}.lk-lesson-mic-status--tile{width:18px;height:18px;border-radius:50%;background:#22c55e;color:#fff}.lk-lesson-mic-status--tile.lk-lesson-mic-status--off{background:#52525b;color:rgba(255,255,255,.9)}.lk-lesson-mic-status--tile svg{width:10px;height:10px}.lk-lesson-mic-status--panel{width:28px;height:28px;border-radius:6px;background:transparent}.lk-lesson-mic-status--panel.lk-lesson-mic-status--off{background:rgba(220,38,38,.22)}.lk-lesson-participant-row-actions{display:flex;flex-shrink:0;align-items:center;gap:4px}.lk-moderation-menu-wrap{position:relative}.lk-moderation-menu-trigger{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border:none;border-radius:6px;background:transparent;color:rgba(255,255,255,.75);cursor:pointer}.lk-moderation-menu-trigger:hover{background:rgba(255,255,255,.12);color:#fff}.lk-moderation-menu{position:absolute;right:0;top:calc(100% + 4px);z-index:30;min-width:220px;padding:4px;border-radius:8px;background:#1a1a1a;border:1px solid rgba(255,255,255,.12);box-shadow:0 8px 24px rgba(0,0,0,.45)}.lk-moderation-menu-item{display:block;width:100%;padding:8px 10px;border:none;border-radius:var(--lk-control-radius,8px);background:transparent;color:rgba(255,255,255,.92);font-size:var(--lk-text-sm,14px);text-align:left;cursor:pointer}.lk-moderation-menu-item:hover{background:rgba(255,255,255,.08)}.lk-moderation-menu-item--danger{color:#fca5a5}.lk-moderation-menu--portal{position:fixed;z-index:10000}.lk-moderation-toast{position:absolute;left:50%;bottom:72px;z-index:40;max-width:min(90%,360px);padding:10px 14px;border-radius:8px;background:rgba(20,20,20,.92);border:1px solid rgba(255,255,255,.14);color:#fff;font-size:var(--lk-text-sm,14px);text-align:center;transform:translateX(-50%);pointer-events:none}.lk-moderation-confirm-backdrop{position:absolute;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;padding:16px;background:rgba(0,0,0,.55);pointer-events:auto}.lk-moderation-confirm-backdrop--portal{position:fixed}.lk-moderation-confirm{box-sizing:border-box;width:min(100%,360px);padding:18px 16px 16px;border-radius:14px;background:#1c1c1c;border:1px solid rgba(255,255,255,.12);box-shadow:0 16px 40px rgba(0,0,0,.45);font-family:var(--lk-brand-font,inherit)}.lk-moderation-confirm-title{margin:0 0 8px;color:#fff;font-size:var(--lk-text-md,16px);font-weight:600;line-height:1.3}.lk-moderation-confirm-text{margin:0 0 16px;color:rgba(255,255,255,.72);font-size:var(--lk-text-sm,14px);line-height:var(--lk-leading-sm,20px)}.lk-moderation-confirm-actions{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:8px}.lk-moderation-confirm-btn{box-sizing:border-box;display:inline-flex;min-width:88px;min-height:var(--lk-control-size,40px);height:var(--lk-control-size,40px);align-items:center;justify-content:center;padding:0 14px;border-radius:var(--lk-control-radius,12px);border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.08);color:#fff;font-family:inherit;font-size:var(--lk-text-sm,14px);font-weight:600;line-height:1;cursor:pointer;-moz-appearance:none;appearance:none;-webkit-appearance:none}.lk-moderation-confirm-btn:hover{background:rgba(255,255,255,.14)}.lk-moderation-confirm-btn--danger{border-color:#dc2626;background:#dc2626;color:#fff}.lk-moderation-confirm-btn--danger:hover{border-color:#ef4444;background:#ef4444}.lk-moderation-confirm-btn--primary{border-color:var(--lk-brand-primary,#ffcb00);background:var(--lk-brand-primary,#ffcb00);color:var(--lk-brand-primary-ink,#111111)}.lk-moderation-confirm-btn--primary:hover{background:var(--tp-primary-hover,#f0be00);border-color:var(--tp-primary-hover,#f0be00)}.lk-moderation-kicked{position:absolute;inset:0;z-index:60;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.75)}.lk-moderation-kicked-card{width:min(92%,380px);padding:24px;border-radius:12px;background:#1c1c1c;border:1px solid rgba(255,255,255,.12);text-align:center}.lk-moderation-kicked-title{margin:0 0 8px;color:#fff;font-size:var(--lk-text-md);font-weight:600}.lk-moderation-kicked-text{margin:0 0 20px;color:rgba(255,255,255,.72);font-size:var(--lk-text-sm);line-height:var(--lk-leading-sm)}.lk-moderation-kicked-btn{display:inline-flex;height:var(--lk-control-size);align-items:center;justify-content:center;padding:0 16px;border:none;border-radius:var(--lk-control-radius);background:var(--lk-brand-primary);color:var(--lk-brand-primary-ink);font-size:var(--lk-text-xs);font-weight:500;line-height:1;cursor:pointer}.lk-lesson-chat-messages{display:flex;min-height:0;flex:1;flex-direction:column;gap:10px;padding:12px;overflow-y:auto}.lk-lesson-chat-empty{margin:auto;color:rgba(255,255,255,.45);font-size:var(--lk-text-xs)}.lk-lesson-aside--chat .lk-lesson-chat-form,.lk-lesson-aside--chat .lk-lesson-chat-inner,.lk-lesson-aside--chat .lk-lesson-chat-messages{color:rgba(255,255,255,.92)}.lk-lesson-chat-bubble{display:flex;max-width:88%;flex-direction:column;gap:3px;padding:8px 12px;border:1px solid rgba(255,255,255,.12);border-radius:var(--lk-chat-radius) var(--lk-chat-radius) var(--lk-chat-radius) 4px;background:rgba(255,255,255,.07);box-shadow:0 1px 2px rgba(0,0,0,.18)}.lk-lesson-chat-bubble--mine{align-self:flex-end;border-color:color-mix(in srgb,var(--lk-brand-primary) 40%,transparent);border-radius:var(--lk-chat-radius) var(--lk-chat-radius) 4px var(--lk-chat-radius);background:color-mix(in srgb,var(--lk-brand-primary) 22%,var(--lk-elevated));color:#fff}.lk-lesson-chat-author{color:rgba(255,255,255,.5);font-size:11px;font-weight:600;letter-spacing:.01em;line-height:1.25}.lk-lesson-chat-bubble--mine .lk-lesson-chat-author{color:color-mix(in srgb,var(--lk-brand-primary) 55%,white)}.lk-lesson-chat-text{color:rgba(255,255,255,.94);font-size:var(--lk-text-sm);line-height:1.4;word-break:break-word}.lk-lesson-chat-form{display:flex;align-items:center;gap:8px;padding:10px 12px 12px;border-top:1px solid rgba(255,255,255,.08)}.lk-lesson-chat-input{min-width:0;flex:1;height:40px;padding:0 12px;border:1px solid rgba(255,255,255,.18);border-radius:var(--lk-field-radius);background:rgba(0,0,0,.35);color:#fff;font-family:inherit;font-size:var(--lk-text-sm);outline:none;transition:border-color .15s ease,background .15s ease}.lk-lesson-chat-input::-moz-placeholder{color:rgba(255,255,255,.4)}.lk-lesson-chat-input::placeholder{color:rgba(255,255,255,.4)}.lk-lesson-chat-input:focus{border-color:color-mix(in srgb,var(--lk-brand-primary) 55%,transparent);background:rgba(0,0,0,.45)}.lk-lesson-chat-send{display:inline-flex;height:40px;flex-shrink:0;align-items:center;justify-content:center;padding:0 14px;border:none;border-radius:var(--lk-field-radius);background:var(--lk-elevated);color:#fff;font-family:inherit;font-size:var(--lk-text-xs);font-weight:600;cursor:pointer;transition:background .15s ease}.lk-lesson-chat-send:hover:not(:disabled){background:color-mix(in srgb,var(--lk-elevated) 82%,white)}.lk-lesson-chat-send:disabled{opacity:.4;cursor:not-allowed}.lk-lesson-btn{position:relative;display:inline-flex;align-items:center;justify-content:center;width:var(--lk-control-size);height:var(--lk-control-size);border:1px solid rgba(255,255,255,.12);border-radius:var(--lk-control-radius);background:rgba(255,255,255,.08);color:#fff;font-family:inherit;font-size:var(--lk-text-xs);font-weight:500;line-height:1;cursor:pointer;transition:background .15s ease,border-color .15s ease,box-shadow .15s ease,transform .12s ease}.lk-lesson-btn:hover{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.18)}.lk-lesson-btn:disabled{opacity:.45;cursor:not-allowed}.lk-lesson-btn--active{background:color-mix(in srgb,var(--lk-brand-primary) 22%,transparent);border-color:color-mix(in srgb,var(--lk-brand-primary) 45%,transparent);box-shadow:0 0 0 1px color-mix(in srgb,var(--lk-brand-primary) 25%,transparent)}.lk-lesson-btn--off{background:rgba(217,45,32,.9);border-color:rgba(217,45,32,.95)}.lk-lesson-btn--off:hover{background:rgba(217,45,32,1)}.lk-lesson-btn--end{padding:0 16px}.lk-lesson-btn--danger-text,.lk-lesson-btn--end{width:auto;min-height:var(--lk-control-size);font-size:var(--lk-text-xs);font-weight:600}.lk-lesson-btn--danger-text{padding:0 14px;background:rgba(255,255,255,.06);color:#fecaca}.lk-lesson-btn--danger-text:hover{background:rgba(220,38,38,.35)}.lk-lesson-btn--leave{width:auto;min-height:var(--lk-control-size);padding:0 14px;font-size:var(--lk-text-xs);font-weight:600;background:rgba(255,255,255,.06);color:rgba(255,255,255,.92)}.lk-lesson-btn--leave:hover{background:rgba(255,255,255,.12)}.lk-lesson-btn svg{width:18px;height:18px;flex-shrink:0}.lk-lesson-tip{position:relative;display:inline-flex;max-width:100%;vertical-align:middle}.lk-lesson-tip__bubble{z-index:9999;width:-moz-max-content;width:max-content;max-width:min(220px,70vw);padding:6px 10px;border:1px solid rgba(255,255,255,.14);border-radius:8px;background:rgba(18,18,22,.97);color:rgba(255,255,255,.96);font-family:Lato,Segoe UI,system-ui,-apple-system,sans-serif;font-size:12px;font-weight:500;line-height:1.3;letter-spacing:.01em;text-align:center;white-space:normal;pointer-events:none;box-shadow:0 8px 24px rgba(0,0,0,.5)}.lk-lesson-tip__bubble--portal{position:fixed;opacity:1;visibility:visible}.lk-lesson-tip__bubble--portal.lk-lesson-tip__bubble--top{transform:translate(-50%,calc(-100% - 8px))}.lk-lesson-tip__bubble--portal.lk-lesson-tip__bubble--bottom{transform:translate(-50%,8px)}@media (hover:none){.lk-lesson-tip__bubble--portal{display:none}}.lk-lesson-status{position:absolute;top:12px;left:50%;z-index:4;padding:4px 10px;border-radius:999px;background:rgba(0,0,0,.65);color:rgba(255,255,255,.9);font-size:var(--lk-text-xs);transform:translateX(-50%)}.lk-lesson-connection-overlay{position:absolute;inset:0;z-index:30;display:flex;align-items:center;justify-content:center;padding:1.5rem;background:rgba(8,10,18,.72);backdrop-filter:blur(4px);opacity:1;transition:opacity .32s ease,backdrop-filter .32s ease}.lk-lesson-connection-overlay--exiting{opacity:0;pointer-events:none;backdrop-filter:blur(0)}.lk-lesson-connection-overlay__card{display:flex;flex-direction:column;align-items:center;gap:.75rem;max-width:22rem;padding:1.25rem 1.5rem;border-radius:1rem;background:rgba(20,24,36,.96);border:1px solid rgba(255,255,255,.08);text-align:center;transition:opacity .28s ease,transform .28s ease}.lk-lesson-connection-overlay--exiting .lk-lesson-connection-overlay__card{opacity:0;transform:translateY(6px) scale(.98)}.lk-lesson-connection-overlay__title{margin:0;color:#fff;font-size:1rem;font-weight:600}.lk-lesson-connection-overlay__text{margin:0;color:rgba(255,255,255,.72);font-size:var(--lk-text-sm,14px);line-height:1.45}.lk-lesson-connection-overlay__spinner{width:1.5rem;height:1.5rem;border:2px solid rgba(255,255,255,.2);border-top-color:rgba(255,255,255,.9);border-radius:50%;animation:lk-lesson-connection-spin .8s linear infinite}@keyframes lk-lesson-connection-spin{to{transform:rotate(1turn)}}.lk-lesson-recording-alert{position:absolute;top:12px;left:50%;z-index:6;display:flex;align-items:flex-start;gap:.5rem;max-width:min(28rem,calc(100% - 2rem));padding:.625rem .75rem;border-radius:.75rem;background:rgba(127,29,29,.92);border:1px solid rgba(248,113,113,.35);color:#fff;transform:translateX(-50%)}.lk-lesson-recording-alert__text{margin:0;font-size:var(--lk-text-sm,14px);line-height:1.4}.lk-lesson-recording-alert__dismiss{flex-shrink:0;width:1.25rem;height:1.25rem;border:none;border-radius:.375rem;background:transparent;color:rgba(255,255,255,.8);font-size:1rem;line-height:1;cursor:pointer}.lk-lesson-recording-alert__dismiss:hover{background:rgba(255,255,255,.12);color:#fff}.lk-lesson-prejoin{--lk-brand-primary:var(--tp-primary,#ffcb00);--lk-brand-primary-ink:var(--tp-primary-ink,#111111);--lk-brand-font:var(
    --tp-font,Lato,"Segoe UI",system-ui,-apple-system,sans-serif
  );--lk-control-size:36px;--lk-control-radius:12px;--lk-field-radius:12px;--lk-control-gap:8px;--lk-text-xs:var(--tp-text-xs,12px);--lk-text-sm:var(--tp-text-sm,14px);--lk-text-md:var(--tp-text-md,16px);--lk-leading-xs:var(--tp-leading-xs,16px);--lk-leading-sm:var(--tp-leading-sm,20px);position:relative;display:flex;width:100%;height:100%;min-height:0;background:#000;color:#fff;overflow:hidden;font-family:var(--lk-brand-font);font-size:var(--lk-text-sm);line-height:var(--lk-leading-sm)}.lk-lesson-prejoin--submitting .lk-lesson-prejoin-chrome{opacity:.72;pointer-events:none;transition:opacity .25s ease}.lk-lesson-prejoin-main{display:flex;width:100%;height:100%;min-height:0;flex-direction:column}.lk-lesson-prejoin-stage-wrap{position:relative;display:flex;min-height:0;flex:1;align-items:center;justify-content:center;padding:12px 16px 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