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.lk-close-button:hover{background-color:var(--lk-control-active-hover-bg)}.lk-chat-messages{display:flex;width:100%;max-height:100%;flex-direction:column;gap:.25rem;overflow:auto}.lk-chat-entry{display:flex;flex-direction:column;gap:.25rem;margin:0 .25rem}.lk-chat-entry .lk-meta-data{font-size:.75rem;color:var(--lk-fg5);white-space:nowrap;padding:0 .3rem;display:flex}.lk-chat-entry .lk-meta-data .lk-participant-name{margin-top:1rem}.lk-chat-entry .lk-meta-data .lk-timestamp{margin-left:auto;align-self:flex-end}.lk-chat-entry .lk-edit-button{background:none;float:right;margin:0;padding:0 .25rem;border-radius:0;font-size:12px}.lk-chat-entry .lk-message-body{display:inline-block;border-radius:15px;padding:.25rem .75rem;word-break:break-word;width:fit-content;max-width:calc(100% - 32px)}.lk-chat-entry[data-lk-message-origin=local] .lk-message-body{background-color:var(--lk-bg5)}.lk-chat-entry[data-lk-message-origin=remote] .lk-message-body{background-color:var(--lk-accent4)}.lk-chat-entry a{text-decoration:underline;color:inherit}.lk-chat-entry *{margin-block-start:.25em;margin-block-end:.25em}.lk-chat-entry:last-child{margin-bottom:.25rem}.lk-chat-form{display:flex;gap:.75rem;padding:.75rem;border-top:1px solid var(--lk-border-color);max-height:var(--lk-control-bar-height)}.lk-chat-form-input{font-size:inherit;line-height:inherit;width:100%}@media(max-width:600px){.lk-chat{position:fixed;top:0;right:0;max-width:100%;bottom:var(--lk-control-bar-height)}}.lk-control-bar,.lk-agent-control-bar{display:flex;gap:.5rem;align-items:center;justify-content:center;padding:.75rem;border-top:1px solid var(--lk-border-color);max-height:var(--lk-control-bar-height)}.lk-agent-control-bar{height:var(--lk-control-bar-height);--lk-bg: transparent;--lk-va-bar-width: 2px;--lk-va-bar-gap: 4px;--lk-va-bar-border-radius: 1px}.lk-agent-control-bar .lk-audio-bar-visualizer .lk-audio-bar.lk-highlighted{filter:none}.lk-prejoin{background-color:var(--lk-bg);line-height:var(--lk-line-height)}[data-lk-theme]{font-size:var(--lk-font-size);font-family:var(--lk-font-family);color:var(--lk-fg)}[data-lk-theme] .lk-list{list-style:none;margin:0;padding:0}[data-lk-theme] .lk-form-control{font-family:var(--lk-font-family);padding:.625rem 1rem;background-color:var(--lk-control-bg);border:1px solid var(--lk-border-color);border-radius:var(--lk-border-radius)}.lk-prejoin{box-sizing:border-box;display:flex;flex-direction:column;align-items:center;padding:1rem;gap:1rem;margin-inline:auto;background-color:var(--lk-bg);width:min(100%,480px);align-items:stretch}.lk-prejoin .lk-video-container{position:relative;width:100%;height:auto;aspect-ratio:16/10;background-color:#000;border-radius:var(--lk-border-radius);overflow:hidden}.lk-prejoin .lk-video-container video,.lk-prejoin .lk-video-container .lk-camera-off-note{display:block;width:100%;height:100%;object-fit:cover}.lk-prejoin .lk-video-container video[data-lk-facing-mode=user]{transform:rotateY(180deg)}.lk-prejoin .lk-video-container .lk-camera-off-note{position:absolute;top:0;left:0;width:100%;aspect-ratio:16/10;background-color:#000;display:grid;place-items:center}.lk-prejoin .lk-video-container .lk-camera-off-note>*{height:70%;max-width:100%}.lk-prejoin .lk-audio-container{display:none}.lk-prejoin .lk-audio-container audio{width:100%;height:auto}.lk-prejoin .lk-button-group-container{display:flex;flex-wrap:nowrap;gap:1rem}.lk-prejoin .lk-button-group-container>.lk-button-group{width:50%}.lk-prejoin .lk-button-group-container>.lk-button-group>.lk-button{justify-content:left}.lk-prejoin .lk-button-group-container>.lk-button-group>.lk-button:first-child{width:100%}@media(max-width:400px){.lk-prejoin .lk-button-group-container{flex-wrap:wrap}.lk-prejoin .lk-button-group-container>.lk-button-group{width:100%}}.lk-prejoin .lk-username-container{display:flex;flex-direction:column;gap:1rem;width:100%;max-width:100%}.lk-prejoin .lk-join-button{--lk-control-fg: var(--lk-accent-fg);--lk-control-bg: var(--lk-accent-bg);--lk-control-hover-bg: var(--lk-accent2);--lk-control-active-bg: var(--lk-accent3);--lk-control-active-hover-bg: var(--lk-accent4);background-color:var(--lk-control-bg)}.lk-prejoin .lk-join-button:hover{background-color:var(--lk-control-hover-bg)}.lk-focus-layout-wrapper,.lk-grid-layout-wrapper{position:relative;display:flex;justify-content:center;width:100%;height:calc(100% - var(--lk-control-bar-height))}.lk-grid-layout-wrapper{flex-direction:column;align-items:center}.lk-focus-layout-wrapper{align-items:stretch}.lk-video-conference{position:relative;display:flex;align-items:stretch;height:100%}.lk-video-conference-inner{display:flex;flex-direction:column;align-items:stretch;width:100%}.lk-settings-menu-modal{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:var(--lk-bg);padding:1rem;display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:.75rem 1.25rem;background-color:var(--lk-bg);border:1px solid var(--lk-border-color);border-radius:var(--lk-border-radius);box-shadow:var(--lk-box-shadow);min-width:50vw;min-height:50vh;max-width:100%;max-height:100%;overflow-y:auto}.loading-screen{display:flex;align-items:center;justify-content:center;min-height:60vh}.loading-spinner{width:36px;height:36px;border:3px solid var(--border-bright);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite}.loading-spinner-sm{width:20px;height:20px;border:2px solid var(--border-bright);border-top-color:var(--primary);border-radius:50%;animation:spin .7s linear infinite;flex-shrink:0}.page{min-height:100vh;display:flex;flex-direction:column;background:var(--bg-base)}.topbar{position:sticky;top:0;z-index:var(--z-sticky, 100);display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-8);height:56px;background:var(--nav-bg);border-bottom:1px solid var(--nav-border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.brand{display:flex;align-items:center;gap:var(--space-2);font-size:var(--font-size-xl);font-weight:800;letter-spacing:-.03em;color:var(--text-on-dark);background:linear-gradient(135deg,#60a5fa,#3b82f6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.brand-icon{font-size:1.1rem;-webkit-text-fill-color:#3b82f6}.nav{display:flex;align-items:center;gap:var(--space-4)}.nav-actions{display:flex;align-items:center;gap:var(--space-3)}.nav-tagline{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500}.nav-user{display:flex;align-items:center;gap:var(--space-2);font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nav-user-dot{width:7px;height:7px;border-radius:50%;background:var(--success);flex-shrink:0}.nav-user-glow{color:#60a5fa;text-shadow:0 0 12px rgba(59,130,246,.5);animation:navUserBlink 1.5s ease-in-out infinite}.nav-user-glow .nav-user-dot{background:#3b82f6;box-shadow:0 0 8px #3b82f6b3}@keyframes navUserBlink{0%,to{color:#60a5fa;text-shadow:0 0 12px rgba(59,130,246,.5)}50%{color:#93c5fd;text-shadow:0 0 20px rgba(59,130,246,.8)}}.nav-signin-btn{font-size:var(--font-size-sm);padding:.45rem 1rem}.content{flex:1;max-width:1000px;margin:0 auto;padding:var(--space-8) var(--space-6) var(--space-12);width:100%}.stack{display:flex;flex-direction:column;gap:var(--space-6)}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:var(--space-6);box-shadow:var(--shadow-card);color:var(--text-primary)}.card h2{font-size:var(--font-size-xl);font-weight:700;letter-spacing:-.02em;color:var(--text-primary);margin-bottom:var(--space-1);line-height:1.2}.card h3{font-size:var(--font-size-lg);font-weight:600;color:var(--text-primary);margin-bottom:var(--space-4)}.card-header{display:flex;align-items:flex-start;gap:var(--space-4);margin-bottom:var(--space-5)}.card-icon{font-size:1.5rem;flex-shrink:0;margin-top:2px}.card-sub{margin-top:var(--space-1)}.card-loading{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-4) 0}.dashboard-banner{background:linear-gradient(135deg,var(--primary-dim) 0%,var(--bg-card-high) 100%);border:1px solid var(--border-bright);border-radius:var(--radius-xl);padding:var(--space-6) var(--space-8);box-shadow:var(--shadow-card)}.dashboard-banner-text h2{font-size:var(--font-size-2xl);font-weight:800;letter-spacing:-.03em;color:var(--text-primary);margin-bottom:var(--space-1)}.dashboard-stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--space-4);margin-bottom:var(--space-6)}.dashboard-stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.1rem 1.25rem;display:flex;align-items:center;gap:1rem;transition:border-color var(--ease-fast)}.dashboard-stat-card:hover{border-color:var(--border-bright)}.dashboard-stat-icon{width:42px;height:42px;border-radius:var(--radius-md);background:var(--primary-dim);color:var(--primary);display:flex;align-items:center;justify-content:center;flex-shrink:0}.dashboard-stat-value{font-size:1.4rem;font-weight:700;color:var(--text-primary);font-variant-numeric:tabular-nums;line-height:1.2}.dashboard-stat-label{font-size:.75rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.dashboard-grid{display:grid;grid-template-columns:360px 1fr;gap:var(--space-6);align-items:start}.classroom-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:var(--space-2)}.classroom-list-item{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);transition:border-color var(--ease-fast),background var(--ease-fast)}.classroom-list-item:hover{border-color:var(--border-bright);background:var(--bg-card-high)}.classroom-link{display:flex;flex-direction:column;gap:var(--space-1);flex:1;min-width:0}.classroom-name{font-size:var(--font-size-base);font-weight:600;color:var(--text-link);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.classroom-id{font-size:var(--font-size-xs)}.btn-sm{font-size:var(--font-size-xs)!important;padding:.35rem .7rem!important;border-radius:var(--radius-md)!important;flex-shrink:0}.empty-state{display:flex;flex-direction:column;align-items:center;text-align:center;gap:var(--space-2);padding:var(--space-8) var(--space-4);border:1px dashed var(--border);border-radius:var(--radius-lg);background:#0b112066}.empty-icon{font-size:2.5rem;margin-bottom:var(--space-2)}.empty-state p{font-size:var(--font-size-base);font-weight:500;color:var(--text-primary)}.row{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4)}.muted{color:var(--text-secondary);font-size:var(--font-size-sm)}.error{color:var(--error);font-size:var(--font-size-sm);font-weight:500;padding:var(--space-2) var(--space-3);background:var(--error-bg);border:1px solid var(--error-border);border-radius:var(--radius-md)}.success{color:var(--success);font-size:var(--font-size-sm);font-weight:500;padding:var(--space-2) var(--space-3);background:var(--success-bg);border:1px solid var(--success-border);border-radius:var(--radius-md)}button{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);font-family:var(--font-family);font-size:var(--font-size-sm);font-weight:600;line-height:1;border:1px solid transparent;border-radius:var(--radius-md);cursor:pointer;transition:background var(--ease-fast),border-color var(--ease-fast),color var(--ease-fast),box-shadow var(--ease-fast),transform var(--ease-fast),opacity var(--ease-fast);white-space:nowrap;padding:.55rem 1rem;background:transparent;color:var(--text-primary)}button:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}button:active:not(:disabled){transform:scale(.98)}.primary,button.primary,a.primary{background:var(--primary);color:var(--on-primary)!important;border-color:transparent;box-shadow:0 2px 8px #3b82f64d;padding:.6rem 1.1rem;border-radius:var(--radius-md);font-weight:600;font-size:var(--font-size-sm);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:background var(--ease-fast),box-shadow var(--ease-fast),transform var(--ease-fast)}.primary:hover,button.primary:hover,a.primary:hover{background:var(--primary-hover);box-shadow:0 4px 16px #3b82f666}.btn-full{width:100%}.ghost,button.ghost,a.ghost{background:transparent;border:1px solid var(--border-bright);color:var(--text-secondary);padding:.55rem 1rem;border-radius:var(--radius-md);font-size:var(--font-size-sm);font-weight:600;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:background var(--ease-fast),border-color var(--ease-fast),color var(--ease-fast)}.ghost:hover,button.ghost:hover,a.ghost:hover{background:var(--bg-card-high);border-color:var(--primary);color:var(--text-primary)}.danger{border-color:var(--error-border)!important;color:var(--error)!important;background:transparent!important}.danger:hover{background:var(--error-bg)!important}.link-button{background:transparent;border:none;color:var(--text-link);font-size:var(--font-size-sm);font-weight:500;padding:0;cursor:pointer;text-align:left}.link-button:hover{text-decoration:underline;color:var(--primary)}.form{display:flex;flex-direction:column;gap:var(--space-4)}.form label{display:flex;flex-direction:column;gap:var(--space-2);font-size:var(--font-size-sm);font-weight:600;color:var(--text-secondary);letter-spacing:.01em}.form input,.form textarea{width:100%;padding:.65rem .9rem;border-radius:var(--radius-md);border:1px solid var(--border-bright);background:var(--bg-input);color:var(--text-primary);font-size:var(--font-size-base);transition:border-color var(--ease-fast),box-shadow var(--ease-fast)}.form input:focus,.form textarea:focus{outline:none;border-color:var(--border-focus);box-shadow:0 0 0 3px var(--primary-glow)}.form input::placeholder,.form textarea::placeholder{color:var(--text-muted)}.form textarea{resize:vertical;min-height:96px}.form-name-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)}.form-footer-link{text-align:center}.tabs{display:flex;gap:var(--space-2);padding:var(--space-1);background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:var(--space-5)}.tab{flex:1;padding:.55rem 1rem;border-radius:var(--radius-md);border:none;background:transparent;color:var(--text-secondary);font-weight:600;font-size:var(--font-size-sm);cursor:pointer;transition:all var(--ease-base)}.tab:hover{color:var(--text-primary);background:var(--bg-card)}.tab.active{background:var(--primary);color:var(--on-primary);box-shadow:0 2px 8px #3b82f659}.auth-page{display:flex;min-height:calc(100vh - 60px);width:100%}.auth-left{width:420px;flex-shrink:0;background:linear-gradient(160deg,#0a1628,#06090f 60%,#0d1a2e);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:var(--space-8);position:relative}.auth-back-link{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500;transition:color var(--ease-fast);margin-bottom:auto}.auth-back-link:hover{color:var(--text-link)}.auth-left-inner{display:flex;flex-direction:column;gap:var(--space-4);margin-top:var(--space-10)}.auth-logo-mark{font-size:2.5rem;color:var(--primary)}.auth-brand{font-size:var(--font-size-3xl);font-weight:800;letter-spacing:-.04em;background:linear-gradient(135deg,#93c5fd,#3b82f6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--space-2)}.auth-tagline{font-size:var(--font-size-lg);color:var(--text-secondary);line-height:1.5}.auth-feature-list{list-style:none;display:flex;flex-direction:column;gap:var(--space-3);margin-top:var(--space-4)}.auth-feature-list li{display:flex;align-items:center;gap:var(--space-3);font-size:var(--font-size-base);color:var(--text-secondary)}.auth-feature-list li span{color:var(--success);font-weight:700;font-size:1rem}.auth-right{flex:1;display:flex;align-items:center;justify-content:center;padding:var(--space-8)}.auth-card{width:100%;max-width:440px}.auth-card-header{margin-bottom:var(--space-6)}.auth-card-header h2{font-size:var(--font-size-2xl);font-weight:800;letter-spacing:-.04em;color:var(--text-primary);margin-bottom:var(--space-2)}.auth-box{transition:box-shadow var(--ease-base),border-color var(--ease-base)}.auth-box:hover{border-color:var(--border-bright);box-shadow:var(--shadow-glow),var(--shadow-card)}.auth-terms{margin-top:var(--space-5);padding-top:var(--space-5);border-top:1px solid var(--border);text-align:center;font-size:var(--font-size-xs);color:var(--text-secondary)}.input-icon-wrap{position:relative}.input-icon-wrap .input-icon{position:absolute;left:.75rem;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:1rem;pointer-events:none}.input-icon-wrap input{padding-left:2.5rem}.list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:var(--space-2)}.list li{display:flex;justify-content:space-between;align-items:center;padding:var(--space-3) var(--space-4);background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);transition:border-color var(--ease-fast),background var(--ease-fast)}.list li:hover{border-color:var(--border-bright);background:var(--bg-card-high)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--space-4)}.drawer{margin-top:var(--space-4);padding:var(--space-4);border-radius:var(--radius-lg);border:1px dashed var(--error-border);background:var(--error-bg)}.drawer p{font-size:var(--font-size-sm);color:var(--error);margin-bottom:var(--space-3)}.sidebar-overlay{position:fixed;inset:0;background:var(--bg-overlay);opacity:0;pointer-events:none;transition:opacity var(--ease-base);z-index:var(--z-modal-backdrop, 1000);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.sidebar-overlay.open{opacity:1;pointer-events:auto}.sidebar{position:fixed;top:0;right:-540px;width:520px;height:100vh;background:var(--bg-surface);border-left:1px solid var(--border);box-shadow:var(--shadow-lg);transition:right var(--ease-slow);z-index:var(--z-modal, 1010);display:flex;flex-direction:column}.sidebar.open{right:0}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-6);border-bottom:1px solid var(--border);min-height:72px}.sidebar-user-info{display:flex;align-items:center;gap:var(--space-3)}.sidebar-user-avatar{width:38px;height:38px;border-radius:50%;background:var(--primary-dim);border:1px solid var(--primary);color:var(--primary);font-size:var(--font-size-md);font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}.sidebar-user-email{font-size:var(--font-size-sm);font-weight:600;color:var(--text-primary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:200px}.sidebar-user-role{font-size:var(--font-size-xs);color:var(--text-secondary);margin-top:2px}.close-btn{width:36px;height:36px;padding:0;border-radius:var(--radius-md);font-size:1rem;color:var(--text-secondary);flex-shrink:0}.sidebar-content{padding:var(--space-5);flex:1;overflow-y:auto}.sidebar-footer{padding:var(--space-4) var(--space-6);border-top:1px solid var(--border)}.logout-btn{width:100%;display:flex;align-items:center;gap:var(--space-2);font-weight:600;font-size:var(--font-size-sm)}.sidebar-layout{display:flex;flex-direction:column;height:100%}.sidebar-nav{display:flex;flex-direction:column;gap:var(--space-1);margin-bottom:var(--space-5);border-bottom:1px solid var(--border);padding-bottom:var(--space-5)}.sidebar-nav-item{background:transparent;border:none;text-align:left;padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all var(--ease-fast);font-size:var(--font-size-sm)}.sidebar-nav-item:hover{background:var(--bg-card-high);color:var(--text-primary)}.sidebar-nav-item.active{background:var(--primary-dim);color:var(--primary)}.sidebar-pane{flex:1;overflow-y:auto}.menu-toggle{width:38px;height:38px;padding:0;border-radius:var(--radius-md)}.notes-shell{padding:0;width:calc(100vw - 3rem);margin-left:50%;transform:translate(-50%);background:transparent;border:none;box-shadow:none;overflow:hidden}.notes-layout{display:flex;gap:var(--space-3);height:calc(100vh - 76px)}.notes-canvas{flex:1 1 60%;border:1px solid var(--border);border-radius:var(--radius-xl);background:var(--bg-card);display:flex;flex-direction:column;height:100%;overflow:hidden}.notes-canvas-slot{flex:1 1 60%;display:flex;flex-direction:column;height:100%}.notes-canvas-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--border);flex-shrink:0;min-height:52px}.notes-canvas-title-row{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--border);flex-shrink:0}.notes-canvas-title-row h3{font-size:var(--font-size-md);font-weight:700;color:var(--text-primary);margin:0}.notes-canvas-meta{display:flex;align-items:center;gap:var(--space-2);min-width:0}.notes-canvas-meta strong{font-weight:600;color:var(--text-primary);font-size:var(--font-size-sm);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.notes-canvas-meta .muted{font-size:var(--font-size-xs);color:var(--text-muted);white-space:nowrap}.screen-share-container{flex:1 1 auto;min-height:0;overflow:hidden;background:#000;display:flex;flex-direction:column}.screen-share-container video{width:100%;height:100%;object-fit:contain;display:block}.notes-canvas.has-screenshare .displayed-list{display:none}.displayed-list{flex:1 1 auto;min-height:0;overflow-y:auto;display:flex;flex-direction:column;gap:var(--space-3);padding:var(--space-4)}.displayed-item{background:var(--bg-surface);border-radius:var(--radius-lg);border:1px solid var(--border);padding:var(--space-4);transition:border-color var(--ease-fast)}.displayed-item:hover{border-color:var(--border-bright)}.displayed-item strong{font-size:var(--font-size-sm);font-weight:700;color:var(--text-primary)}.displayed-item p{margin-top:var(--space-2);font-size:var(--font-size-sm);color:var(--text-secondary);line-height:1.55}.notes-panel{flex:0 0 340px;border:1px solid var(--border);border-radius:var(--radius-xl);background:var(--bg-card);display:flex;flex-direction:column;height:100%;overflow:hidden}.notes-panel-header{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--border);flex-shrink:0;min-height:52px}.notes-panel-header h3{font-size:var(--font-size-md);font-weight:700;color:var(--text-primary);margin:0}.notes-panel-body{flex:1;overflow-y:auto;padding:var(--space-4);display:flex;flex-direction:column;gap:var(--space-4)}.note-list-item{display:flex;align-items:center;justify-content:space-between;gap:var(--space-2);padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-surface);transition:border-color var(--ease-fast);min-height:44px}.note-list-item:hover{border-color:var(--border-bright)}.note-list-meta{display:flex;align-items:center;gap:var(--space-2);min-width:0;flex:1}.note-list-meta strong{font-size:var(--font-size-xs);color:var(--text-muted);flex-shrink:0}.note-list-title{font-size:var(--font-size-sm);color:var(--text-primary);font-weight:500;margin:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.live-side-shell{display:flex;flex-direction:column;height:100%;overflow:hidden}.live-side-content{display:flex;flex-direction:column;gap:var(--space-3);flex:1;min-height:0;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:var(--space-3) var(--space-4)}.live-side-content h3{font-size:var(--font-size-base);font-weight:700;color:var(--text-primary);flex-shrink:0}.live-chat-box{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden}.live-audio-box{flex-shrink:0;padding-top:var(--space-3);border-top:1px solid var(--border)}.live-audio-box h4{font-size:var(--font-size-sm);font-weight:600;color:var(--text-secondary);margin-bottom:var(--space-2)}.live-audio-btn{font-size:var(--font-size-xs);padding:.4rem .85rem}.username-chat{display:flex;flex-direction:column;height:100%;min-height:0;background:var(--bg-surface);border-radius:var(--radius-lg);border:1px solid var(--border);overflow:hidden}.username-chat-list{flex:1;overflow-y:auto;padding:var(--space-3);display:flex;flex-direction:column;gap:var(--space-2);scroll-behavior:smooth}.username-chat-list::-webkit-scrollbar{width:4px}.username-chat-list::-webkit-scrollbar-track{background:transparent}.username-chat-list::-webkit-scrollbar-thumb{background:var(--border-bright);border-radius:4px}.username-chat-list .muted{text-align:center;padding:var(--space-6) 0;font-size:var(--font-size-sm);color:var(--text-muted)}.username-chat-row{display:flex;flex-direction:column;gap:var(--space-1)}.username-chat-row.is-self{align-items:flex-end}.username-chat-row.is-other{align-items:flex-start}.username-chat-item{max-width:82%;padding:var(--space-2) var(--space-3);border-radius:var(--radius-lg);font-size:var(--font-size-sm);line-height:1.45;word-break:break-word}.username-chat-row.is-other .username-chat-item{background:var(--bg-card-high);border:1px solid var(--border);border-top-left-radius:var(--radius-xs);color:var(--text-primary)}.username-chat-row.is-self .username-chat-item{background:var(--primary);color:var(--on-primary);border-top-right-radius:var(--radius-xs);box-shadow:0 2px 8px #3b82f640}.username-chat-meta{display:inline-flex;align-items:center;gap:var(--space-1);margin-bottom:var(--space-1);padding-left:2px}.username-chat-sender{font-size:var(--font-size-xs);font-weight:700;color:var(--text-link)}.username-chat-row.is-self .username-chat-sender{color:#ffffffb3}.username-chat-teacher-tag{display:inline-flex;align-items:center;padding:.1rem .35rem;border-radius:var(--radius-full);border:1px solid var(--tag-teacher-border);background:var(--tag-teacher-bg);color:var(--tag-teacher-text);font-size:.6rem;font-weight:700;letter-spacing:.05em}.username-chat-text{margin:0;overflow-wrap:anywhere;word-break:break-word}.username-chat-form{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-3);border-top:1px solid var(--border);background:var(--bg-card);flex-shrink:0}.username-chat-form input{flex:1;padding:.5rem .75rem;border-radius:var(--radius-full);border:1px solid var(--border-bright);background:var(--bg-input);color:var(--text-primary);font-size:var(--font-size-sm);transition:border-color var(--ease-fast),box-shadow var(--ease-fast)}.username-chat-form input:focus{outline:none;border-color:var(--border-focus);box-shadow:0 0 0 2px var(--primary-glow)}.username-chat-form input::placeholder{color:var(--text-muted)}.username-chat-actions{position:relative;display:inline-flex;align-items:center;gap:var(--space-1)}.chatEmojiButton,.chatSendButton{width:36px;height:36px;padding:0;border-radius:var(--radius-full);border:1px solid var(--border-bright);background:var(--bg-card-high);color:var(--text-secondary);font-size:1rem;display:inline-flex;align-items:center;justify-content:center;transition:background var(--ease-fast),color var(--ease-fast),border-color var(--ease-fast);box-shadow:none}.chatEmojiButton:hover,.chatSendButton:hover{background:var(--primary);border-color:transparent;color:var(--on-primary);box-shadow:0 2px 8px #3b82f64d}.chat-emoji-picker{position:absolute;right:0;bottom:calc(100% + var(--space-2));width:188px;display:grid;grid-template-columns:repeat(6,1fr);gap:var(--space-1);padding:var(--space-2);border:1px solid var(--border-bright);border-radius:var(--radius-lg);background:var(--bg-card);box-shadow:var(--shadow-lg);z-index:20}.chat-emoji-item{width:100%;min-height:30px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-surface);padding:0;font-size:.95rem;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background var(--ease-fast)}.chat-emoji-item:hover{background:var(--bg-card-high);border-color:var(--border-bright)}.live-audio-btn-row{display:flex;gap:var(--space-2);flex-wrap:wrap}.classroom-actions{justify-content:flex-end}.mobile-splitter{display:none;align-items:center;justify-content:center;min-height:24px;cursor:ns-resize;touch-action:none;-webkit-user-select:none;user-select:none;flex-shrink:0;z-index:var(--z-splitter, 10)}.mobile-splitter-arrow{display:inline-flex;align-items:center;justify-content:center;width:48px;height:5px;border-radius:var(--radius-full);background:var(--border-bright);font-size:0;transition:transform var(--ease-fast),background var(--ease-fast)}.mobile-splitter.is-dragging .mobile-splitter-arrow,.mobile-splitter:hover .mobile-splitter-arrow{transform:scaleY(1.4);background:var(--primary)}.invite-card{max-width:480px;margin:var(--space-8) auto}.landing{width:100%;overflow-x:hidden}.hero{position:relative;display:flex;align-items:center;justify-content:space-between;gap:var(--space-12);padding:6rem var(--space-8) 5rem;max-width:1100px;margin:0 auto;overflow:hidden}.hero-glow{position:absolute;top:-100px;left:-100px;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(59,130,246,.08) 0%,transparent 70%);pointer-events:none}.hero-inner{flex:1;max-width:560px}.hero-badge{display:inline-flex;align-items:center;gap:var(--space-2);padding:.35rem .9rem;border:1px solid var(--border-bright);border-radius:var(--radius-full);background:var(--bg-card);color:var(--text-secondary);font-size:var(--font-size-xs);font-weight:600;letter-spacing:.03em;margin-bottom:var(--space-6)}.hero-title{font-size:var(--font-size-4xl);font-weight:800;letter-spacing:-.04em;color:var(--text-primary);line-height:1.1;margin-bottom:var(--space-5)}.hero-accent{background:linear-gradient(135deg,#60a5fa,#38bdf8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-sub{font-size:var(--font-size-lg);color:var(--text-secondary);line-height:1.65;margin-bottom:var(--space-8);max-width:480px}.hero-cta{display:flex;align-items:center;gap:var(--space-4);flex-wrap:wrap;margin-bottom:var(--space-4)}.cta-primary{display:inline-flex;align-items:center;gap:var(--space-2);padding:.75rem 1.5rem;background:var(--primary);color:var(--on-primary);font-size:var(--font-size-base);font-weight:700;border-radius:var(--radius-lg);letter-spacing:-.01em;box-shadow:0 4px 20px #3b82f659;transition:background var(--ease-fast),box-shadow var(--ease-fast),transform var(--ease-fast)}.cta-primary:hover{background:var(--primary-hover);box-shadow:0 6px 28px #3b82f673;transform:translateY(-1px)}.cta-primary--large{padding:.85rem 2rem;font-size:var(--font-size-md)}.cta-ghost{display:inline-flex;align-items:center;padding:.75rem 1.25rem;border:1px solid var(--border-bright);color:var(--text-secondary);font-size:var(--font-size-base);font-weight:600;border-radius:var(--radius-lg);transition:border-color var(--ease-fast),color var(--ease-fast),background var(--ease-fast)}.cta-ghost:hover{border-color:var(--primary);color:var(--text-primary);background:var(--bg-card)}.hero-note{font-size:var(--font-size-xs);color:var(--text-muted)}.hero-preview{flex-shrink:0;width:360px}.preview-card{background:var(--bg-card);border:1px solid var(--border-bright);border-radius:var(--radius-2xl);overflow:hidden;box-shadow:var(--shadow-lg),0 0 40px #3b82f614}.preview-topbar{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);background:var(--bg-surface);border-bottom:1px solid var(--border)}.preview-dot{width:10px;height:10px;border-radius:50%}.preview-dot.red{background:#f87171}.preview-dot.yellow{background:#fbbf24}.preview-dot.green{background:#4ade80}.preview-title{flex:1;font-size:var(--font-size-xs);font-weight:600;color:var(--text-secondary);text-align:center}.preview-live-badge{font-size:var(--font-size-xs);font-weight:700;color:#f87171;letter-spacing:.05em}.preview-body{padding:var(--space-4);display:flex;flex-direction:column;gap:var(--space-3)}.preview-note{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-3) var(--space-4)}.preview-note strong{display:block;font-size:var(--font-size-xs);font-weight:700;color:var(--primary);margin-bottom:var(--space-1);letter-spacing:.03em}.preview-note p{font-size:var(--font-size-xs);color:var(--text-secondary);line-height:1.5}.preview-chat{display:flex;flex-direction:column;gap:var(--space-2)}.preview-bubble{max-width:80%;padding:.4rem .75rem;border-radius:var(--radius-lg);font-size:var(--font-size-xs);line-height:1.4}.preview-bubble.other{background:var(--bg-card-high);border:1px solid var(--border);color:var(--text-secondary);align-self:flex-start;border-top-left-radius:2px}.preview-bubble.self{background:var(--primary);color:#fff;align-self:flex-end;border-top-right-radius:2px}.preview-quiz-bar{background:#3b82f61a;border:1px solid rgba(59,130,246,.2);border-radius:var(--radius-md);padding:var(--space-2) var(--space-3);font-size:var(--font-size-xs);color:var(--text-link);font-weight:600}.section-inner{max-width:1100px;margin:0 auto;padding:0 var(--space-8)}.section-label{font-size:var(--font-size-xs);font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--primary);margin-bottom:var(--space-3)}.section-title{font-size:var(--font-size-3xl);font-weight:800;letter-spacing:-.04em;color:var(--text-primary);margin-bottom:var(--space-10);line-height:1.1}.features-section{padding:5rem 0;background:var(--bg-surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-4)}.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:var(--space-6);transition:border-color var(--ease-base),box-shadow var(--ease-base),transform var(--ease-base)}.feature-card:hover{border-color:var(--border-bright);box-shadow:var(--shadow-card);transform:translateY(-2px)}.feature-icon{font-size:1.75rem;display:block;margin-bottom:var(--space-4)}.feature-card h3{font-size:var(--font-size-base);font-weight:700;color:var(--text-primary);margin-bottom:var(--space-2)}.feature-card p{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:1.6}.how-section{padding:5rem 0}.steps-row{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-6);position:relative}.step-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);padding:var(--space-6);position:relative}.step-num{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-md);background:var(--primary-dim);border:1px solid var(--primary);color:var(--primary);font-size:var(--font-size-sm);font-weight:800;letter-spacing:-.02em;margin-bottom:var(--space-4)}.step-card h3{font-size:var(--font-size-base);font-weight:700;color:var(--text-primary);margin-bottom:var(--space-2)}.step-card p{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:1.6}.step-arrow{position:absolute;right:-1.5rem;top:2rem;color:var(--text-muted);font-size:1.25rem;pointer-events:none;z-index:1}.cta-banner{position:relative;padding:5rem 0;background:var(--bg-surface);border-top:1px solid var(--border);overflow:hidden}.cta-banner-glow{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:800px;height:400px;border-radius:50%;background:radial-gradient(ellipse,rgba(59,130,246,.07) 0%,transparent 70%);pointer-events:none}.cta-banner-inner{text-align:center;display:flex;flex-direction:column;align-items:center;gap:var(--space-4);position:relative}.cta-banner-inner h2{font-size:var(--font-size-3xl);font-weight:800;letter-spacing:-.04em;color:var(--text-primary);line-height:1.1}.cta-banner-inner p{font-size:var(--font-size-lg);color:var(--text-secondary)}.landing-footer{display:flex;align-items:center;justify-content:space-between;padding:var(--space-6) var(--space-8);border-top:1px solid var(--border);max-width:1100px;margin:0 auto;width:100%}.brand-sm{font-size:var(--font-size-sm);font-weight:800;letter-spacing:-.02em;background:linear-gradient(135deg,#60a5fa,#3b82f6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.footer-copy{font-size:var(--font-size-xs);color:var(--text-muted)}@media(max-width:900px){.topbar{padding:0 var(--space-4);height:56px}.brand{font-size:var(--font-size-lg)}.nav-tagline{display:none}.nav-user{max-width:140px;font-size:var(--font-size-xs)}.menu-toggle{width:36px;height:36px}.content{padding:var(--space-4) var(--space-4) var(--space-8);max-width:100%}.stack{gap:var(--space-4)}.card{padding:var(--space-5)}.card h2{font-size:var(--font-size-lg)}.card h3{font-size:var(--font-size-base)}.dashboard-banner{padding:var(--space-5) var(--space-5)}.dashboard-banner-text h2{font-size:var(--font-size-xl)}.dashboard-grid{grid-template-columns:1fr;gap:var(--space-4)}.auth-page{flex-direction:column;min-height:calc(100vh - 56px)}.auth-left{width:100%;padding:var(--space-5) var(--space-4);border-right:none;border-bottom:1px solid var(--border)}.auth-back-link{margin-bottom:0}.auth-left-inner{margin-top:var(--space-4);gap:var(--space-3)}.auth-logo-mark{font-size:1.75rem}.auth-brand{font-size:var(--font-size-2xl)}.auth-tagline{font-size:var(--font-size-base)}.auth-feature-list{flex-direction:row;flex-wrap:wrap;gap:var(--space-2)}.auth-feature-list li{font-size:var(--font-size-sm);background:var(--bg-card);padding:var(--space-2) var(--space-3);border-radius:var(--radius-md);border:1px solid var(--border)}.auth-right{padding:var(--space-5) var(--space-4);align-items:flex-start}.auth-card{max-width:100%}.auth-card-header h2{font-size:var(--font-size-xl)}.form-name-row{grid-template-columns:1fr}.sidebar{width:min(90vw,360px);right:calc(-1*min(90vw,360px))}.sidebar-header{padding:var(--space-3) var(--space-4)}.sidebar-user-email{max-width:160px}.hero{flex-direction:column;padding:3.5rem var(--space-4) 3rem;gap:var(--space-8);text-align:center}.hero-inner{max-width:100%}.hero-title{font-size:var(--font-size-3xl)}.hero-sub{font-size:var(--font-size-base);max-width:100%;margin-left:auto;margin-right:auto}.hero-cta{justify-content:center}.hero-badge{margin-left:auto;margin-right:auto}.hero-preview{width:100%;max-width:360px;margin:0 auto}.section-inner{padding:0 var(--space-4)}.section-title{font-size:var(--font-size-2xl)}.features-section{padding:3rem 0}.features-grid{grid-template-columns:repeat(2,1fr);gap:var(--space-3)}.feature-card{padding:var(--space-4)}.how-section{padding:3rem 0}.steps-row{grid-template-columns:1fr;gap:var(--space-4)}.step-arrow{display:none}.cta-banner{padding:3rem 0}.cta-banner-inner h2{font-size:var(--font-size-2xl)}.cta-banner-inner p{font-size:var(--font-size-base)}.landing-footer{padding:var(--space-4);flex-direction:column;gap:var(--space-2);text-align:center}.notes-shell{width:calc(100% + var(--space-4) * 2);margin:calc(var(--space-4) * -1) calc(var(--space-4) * -1) calc(var(--space-8) * -1);transform:none;padding:0;border-radius:0;border:none;box-shadow:none}.live-audio-btn-row{display:flex;gap:var(--space-2);flex-wrap:wrap;padding-bottom:20px;flex-shrink:0}.notes-layout{flex-direction:column;height:100vh;gap:0}.notes-layout.mobile-resizable{height:100vh;overflow:hidden;gap:var(--space-4)}.notes-layout.mobile-resizable .live-chat-box{flex:1;min-height:200px;overflow:hidden}.notes-layout.mobile-resizable .notes-canvas,.notes-layout.mobile-resizable .notes-canvas-slot{flex:1;height:auto;border-radius:var(--radius-lg)}.notes-layout.mobile-resizable .notes-panel{flex:none;height:auto;max-height:50vh;border-radius:var(--radius-lg);overflow:hidden}.notes-canvas,.notes-canvas-slot{width:100%;border-radius:var(--radius-lg)}.notes-panel{width:100%;border-radius:var(--radius-lg);min-height:240px}.mobile-splitter,.notes-canvas-title-row,.notes-panel-header h3{display:none}.notes-layout.mobile-resizable .notes-panel-header{position:relative}.notes-layout.mobile-resizable .notes-panel-header .options-menu-container{position:absolute!important;right:var(--space-3)!important;top:50%!important;transform:translateY(-50%)!important;z-index:60}.notes-layout.mobile-resizable .notes-panel-header>div{display:flex;align-items:center;gap:var(--space-2)}.notes-panel-body{padding:var(--space-3)}.live-side-content h3{display:none}.live-audio-box h4{font-size:var(--font-size-xs)}.note-list-item{min-height:36px;padding:var(--space-1) var(--space-2)}.note-list-title{font-size:var(--font-size-xs)}.displayed-list{padding:var(--space-2);gap:var(--space-2)}.displayed-item{padding:var(--space-2) var(--space-3)}.displayed-item p,button,.primary,.ghost,.tab,.sidebar-nav-item{font-size:var(--font-size-xs)}.primary,button.primary,a.primary{padding:.5rem .9rem}.cta-primary{padding:.65rem 1.25rem;font-size:var(--font-size-sm)}.form input,.form textarea{padding:.55rem .75rem;font-size:var(--font-size-sm)}.username-chat-item{max-width:88%;font-size:var(--font-size-xs)}.username-chat-sender{font-size:.65rem}.username-chat-teacher-tag{font-size:.52rem}.chatEmojiButton,.chatSendButton{width:30px;height:30px}.username-chat-form input{font-size:var(--font-size-xs)}.sidebar-nav{padding-bottom:var(--space-3);gap:0}.sidebar-nav-item{font-size:var(--font-size-xs)}.list li{padding:var(--space-2) 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