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.lk-grid-layout:has(>:nth-child(2)):not(:has(>:nth-child(3))){display:block;position:relative;padding:0}.room-wrap .lk-grid-layout:has(>:nth-child(2)):not(:has(>:nth-child(3)))>.lk-participant-tile{width:100%;height:100%}.room-wrap .lk-grid-layout:has(>:nth-child(2)):not(:has(>:nth-child(3)))>.lk-participant-tile[data-lk-local-participant=true]{position:absolute!important;right:14px;bottom:14px;width:clamp(150px,24vw,300px)!important;height:auto!important;aspect-ratio:16 / 9;z-index:6;border-radius:12px;overflow:hidden;border:1px solid rgba(255,255,255,.2);box-shadow:0 8px 28px #00000080}.room-wrap .lk-focus-layout{grid-template-columns:220px minmax(0,1fr)}.room-wrap .lk-carousel .lk-participant-tile{max-height:140px}.room-wrap .lk-chat{width:min(340px,100vw);flex-shrink:0}[data-lk-theme=default]{--lk-accent-bg: var(--indigo);--lk-accent-fg: #fff}.room-wrap .lk-control-bar{justify-content:center;gap:12px;border-top:none;background:#0a0b1ceb;padding:12px 16px}.room-wrap .lk-control-bar>.lk-button,.room-wrap .lk-control-bar>.lk-button-group>.lk-button,.room-wrap .lk-control-bar>.lk-disconnect-button{font-size:0;gap:0;width:52px;height:52px;padding:0;border-radius:999px;justify-content:center;align-items:center;background:#ffffff21;transition:background .15s}.room-wrap .lk-control-bar>.lk-button:hover,.room-wrap .lk-control-bar>.lk-button-group>.lk-button:hover{background:#ffffff3d}.room-wrap .lk-control-bar svg{flex-shrink:0}.room-wrap .lk-control-bar>.lk-disconnect-button{width:68px;background:#dc3d43}.room-wrap .lk-control-bar>.lk-disconnect-button:hover{background:#b7343a}.room-wrap .lk-control-bar .lk-button-menu{font-size:0;width:30px;height:52px;padding:0;border-radius:999px;background:transparent}.room-wrap .lk-device-menu{font-size:13px}.room-wrap .lk-device-menu .lk-button{font-size:13px;width:auto;height:auto;border-radius:8px;justify-content:flex-start}.room-topbar{position:absolute;top:0;left:0;right:0;z-index:20;display:flex;align-items:center;gap:12px;padding:10px 16px;background:linear-gradient(180deg,rgba(5,6,20,.75),transparent);color:#fff;pointer-events:none}.room-topbar .live-dot{width:9px;height:9px;border-radius:50%;background:#ff4d4d;box-shadow:0 0 #ff4d4d99;animation:live-pulse 1.6s infinite;flex-shrink:0}@keyframes live-pulse{0%{box-shadow:0 0 #ff4d4d8c}70%{box-shadow:0 0 0 8px #ff4d4d00}to{box-shadow:0 0 #ff4d4d00}}.room-topbar-title{font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.room-topbar-timer{font-variant-numeric:tabular-nums;font-size:13px;color:#d6d9f0}.room-topbar-count{font-size:13px;color:#d6d9f0;margin-left:auto}.room-ask-btn{pointer-events:auto;border:1px solid rgba(255,255,255,.3);background:#ffffff1f;color:#fff;font-size:13px;font-weight:600;padding:7px 14px;border-radius:999px;cursor:pointer;transition:background .15s}.room-ask-btn:hover:not(:disabled){background:#ffffff3d}.room-ask-btn:disabled{opacity:.7;cursor:default}.screen-request-stack{position:absolute;top:56px;right:16px;z-index:30;display:flex;flex-direction:column;gap:10px;max-width:min(340px,calc(100vw - 32px))}.screen-request-toast{background:#1c1e3a;border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:14px 16px;color:#fff;box-shadow:0 8px 28px #00000073;animation:toast-in .25s ease}@keyframes toast-in{0%{transform:translateY(-8px);opacity:0}to{transform:translateY(0);opacity:1}}.screen-request-toast .msg{font-size:14px;display:block;margin-bottom:10px}.screen-request-toast .row{display:flex;gap:8px}.screen-request-toast button{flex:1;border:none;border-radius:8px;padding:8px 10px;font-size:13px;font-weight:700;cursor:pointer}.screen-request-toast .ok{background:var(--indigo);color:#fff}.screen-request-toast .ok:hover{background:var(--indigo-d)}.screen-request-toast .no{background:#ffffff1f;color:#fff}.screen-request-toast .no:hover{background:#ffffff38}.board-overlay{position:absolute;top:0;right:0;bottom:0;left:0;bottom:var(--lk-control-bar-height, 69px);z-index:35;background:#0f1022;display:flex}.board-page{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#0f1022;display:flex}.board-panel{flex:1;display:flex;flex-direction:column;min-width:0}.board-loading{color:#cdd1ee;display:grid;place-items:center;flex:1}.board-toolbar{display:flex;align-items:center;gap:10px;padding:10px 14px;background:#171930;color:#fff;border-bottom:1px solid rgba(255,255,255,.1);flex-wrap:wrap}.board-colors{display:flex;gap:6px}.board-color{width:24px;height:24px;border-radius:50%;border:2px solid transparent;cursor:pointer}.board-color.on{border-color:#fff;transform:scale(1.15)}.board-tool{border:none;background:#ffffff1a;border-radius:8px;width:34px;height:34px;font-size:16px;cursor:pointer}.board-tool.on{background:var(--indigo)}.board-tool.formula{width:auto;padding:0 12px;font-weight:800;font-style:italic;background:#1a9f6c}.board-tool.formula:hover{background:#148257}.board-tool.formula.on{background:#0d6b47;box-shadow:0 0 0 2px #ffffff8c}.board-canvas-wrap{position:relative}.board-sheet canvas.texting{cursor:text}.board-inline-editor{position:absolute;background:transparent;border:none;outline:none;box-shadow:0 0 0 1.5px var(--indigo),0 0 0 4px #5b5bf02e;border-radius:3px;padding:0;margin:0;font-family:Consolas,Courier New,monospace;line-height:1.3;white-space:pre;overflow:hidden;resize:none;z-index:5}.board-math-hint{position:fixed;bottom:96px;left:50%;transform:translate(-50%);z-index:95;background:var(--ink);color:#fff;border-radius:999px;padding:9px 16px;font-size:var(--fs-sm);box-shadow:var(--shadow-md);pointer-events:none}.board-mathbar{position:fixed;bottom:84px;left:50%;transform:translate(-50%);z-index:95;background:var(--surface);border-radius:var(--r-lg);box-shadow:var(--shadow-md);width:min(480px,calc(100% - 24px));display:grid;gap:8px;padding:10px}.mc-bar-actions{display:flex;align-items:center;gap:8px}.mc-hint{flex:1;font-size:var(--fs-2xs);color:var(--muted)}.mc-templates-btn{border:1px solid var(--line2);background:var(--surface);color:var(--ink);border-radius:999px;padding:5px 10px;font-size:var(--fs-xs);cursor:pointer}.mc-templates-btn:hover{background:var(--indigo-bg)}.mc-templates{display:grid;gap:6px;border:1px solid var(--line);border-radius:12px;padding:8px;background:#f7f8fd;max-height:200px;overflow-y:auto}.mc-template-row{display:grid;text-align:left;gap:2px;border:none;background:var(--surface);border-radius:10px;padding:7px 10px;cursor:pointer;color:var(--ink)}.mc-template-row:hover{background:var(--indigo-bg)}.mc-template-row b{font-size:var(--fs-xs)}.mc-template-row span{font-size:var(--fs-2xs);color:var(--muted);font-family:Consolas,Courier New,monospace}.mc-ctrl{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}.mc-ctrl button{border:none;background:var(--ink);color:#fff;border-radius:999px;padding:8px 0;font-size:15px;cursor:pointer}.mc-ctrl button.on{background:var(--indigo)}.mc-tabs{display:flex;gap:6px;overflow-x:auto}.mc-tabs button{border:1px solid var(--line2);background:var(--surface);color:var(--ink);border-radius:999px;padding:6px 12px;font-size:var(--fs-xs);font-style:italic;white-space:nowrap;cursor:pointer}.mc-tabs button.on{background:var(--ink);color:#fff;border-color:var(--ink)}.mc-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}.mc-grid button{border:none;background:#f0f1fa;border-radius:10px;padding:12px 0;font-size:16px;font-weight:600;cursor:pointer;color:var(--ink)}.mc-grid button:hover{background:var(--indigo-bg)}.mc-grid button.fn{background:#e3e5f5;font-size:14px;font-style:italic}.mc-place{border:none;background:#1a9f6c;color:#fff;border-radius:999px;padding:9px 16px;font-size:var(--fs-sm);font-weight:700;cursor:pointer;white-space:nowrap}.mc-place:hover{background:#148257}.board-width{background:#ffffff1a;color:#fff;border:none;border-radius:8px;padding:6px 8px;font-size:13px}.board-width option{color:#000}.board-close{border:none;background:#ffffff1f;color:#fff;border-radius:8px;width:32px;height:32px;cursor:pointer;font-size:14px}.room-ask-btn.dark{border-color:#ffffff59}.board-ribbon{flex:1;overflow-y:auto;padding:16px;display:grid;gap:18px;justify-items:center;align-content:start}.board-sheet{width:min(1120px,100%)}.board-sheet-label{color:#8f94bd;font-size:12px;margin-bottom:4px}.board-sheet canvas{width:100%;height:auto;border-radius:10px;background:#fff;display:block;touch-action:none;box-shadow:0 4px 20px #00000059}.board-sheet canvas.drawing{cursor:crosshair}.board-sheet canvas.erasing{cursor:cell}.msg-board-link{display:inline-block;background:var(--indigo);color:#fff!important;border-radius:8px;padding:6px 12px;margin-top:4px;font-weight:700;font-size:13px;text-decoration:none}.msg-board-link:hover{background:var(--indigo-d)}.attention-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:40;background:#08091ab8;display:grid;place-items:center;animation:toast-in .2s ease}.attention-card{background:#1c1e3a;border:1px solid rgba(255,255,255,.16);border-radius:20px;padding:28px 32px;text-align:center;color:#fff;display:grid;gap:8px;justify-items:center;max-width:min(360px,calc(100vw - 40px));box-shadow:0 16px 48px #00000080}.attention-card .emoji{font-size:40px}.attention-card b{font-size:19px}.attention-card p{font-size:13px;color:#b9bede}.attention-card button{margin-top:6px;border:none;border-radius:12px;background:#1a9f6c;color:#fff;font-size:16px;font-weight:800;padding:12px 26px;cursor:pointer}.attention-card button:hover{background:#148257}.room-loading{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#0f1022;display:grid;place-content:center;justify-items:center;gap:14px;color:#cdd1ee;font-size:15px}.room-spinner{width:42px;height:42px;border-radius:50%;border:3px solid rgba(255,255,255,.15);border-top-color:var(--indigo);animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.room-error-card{display:grid;gap:12px;justify-items:start;max-width:420px;padding:0 20px}.room-lobby{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#0f1022;display:grid;place-items:center;padding:24px;overflow-y:auto}.room-lobby-card{width:min(560px,100%);text-align:center}.room-lobby-card h1{color:#fff;font-size:24px;margin-bottom:4px}.room-lobby-sub{color:#a9aed6;font-size:14px;margin-bottom:18px}.room-lobby .lk-prejoin{background:transparent;padding:0}.room-lobby .lk-username-container input{display:none}.room-lobby .lk-username-container{display:flex;justify-content:center;margin-top:14px}.room-lobby .lk-prejoin .lk-join-button{width:min(320px,100%);padding:12px 20px;font-size:15px}.room-lobby .lk-prejoin .lk-video-container{border-radius:16px;overflow:hidden;border:1px solid rgba(255,255,255,.12)}.room-lobby .lk-prejoin .lk-join-button{background:var(--indigo);font-weight:700;border-radius:10px}.room-lobby .lk-prejoin .lk-join-button:hover{background:var(--indigo-d)}.room-lobby-back{margin-top:16px;background:none;border:none;color:#a9aed6;font-size:14px;cursor:pointer}.room-lobby-back:hover{color:#fff}@media (max-width: 640px){:root{--fs-2xs: 12px;--fs-xs: 13px;--fs-sm: 14px;--fs-base: 15px}.app-header{padding:0 14px;gap:10px}.app-main{padding:16px 12px 48px}.card{padding:16px}.page-head{flex-direction:column;align-items:stretch}.page-head .row .btn{flex:1}.stat-grid{grid-template-columns:repeat(2,1fr);gap:10px}.stat-card{padding:12px 14px;gap:10px}.stat-icon{width:36px;height:36px;font-size:17px;border-radius:11px}.stat-card .num{font-size:19px}.course-grid{grid-template-columns:1fr}.input{font-size:16px}.journal-line{flex-wrap:wrap;gap:6px 10px}.auth-card{padding:24px 20px}.room-wrap .lk-focus-layout{grid-template-columns:1fr;grid-template-rows:minmax(0,1fr) 96px}.room-wrap .lk-carousel .lk-participant-tile{max-height:96px}}@media (max-width: 400px){.app-header .user-name{display:none}.logo{font-size:17px}}