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.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}@keyframes spin{to{transform:rotate(360deg)}}.page{min-height:100vh;display:flex;flex-direction:column;background:var(--bg-base)}.topbar{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 var(--space-8);height:60px;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-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)}.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:998;-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:999;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}.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:20px;cursor:ns-resize;touch-action:none;-webkit-user-select:none;user-select:none;flex-shrink:0}.mobile-splitter-arrow{display:inline-flex;align-items:center;justify-content:center;width:40px;height:16px;border:1px solid var(--border-bright);border-radius:var(--radius-full);background:var(--bg-card);color:var(--text-secondary);font-size:.6rem;transition:transform var(--ease-fast),background var(--ease-fast)}.mobile-splitter.is-dragging .mobile-splitter-arrow{transform:scale(1.08);background:var(--primary-dim);color: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) var(--space-3);font-size:var(--font-size-xs)}.classroom-name{font-size:var(--font-size-sm)}.classroom-list-item{padding:var(--space-3)}}@media(max-width:400px){.hero-title{font-size:var(--font-size-2xl)}.section-title{font-size:var(--font-size-xl)}.features-grid{grid-template-columns:1fr}.hero-cta{flex-direction:column;align-items:stretch}.cta-ghost{text-align:center;justify-content:center}}.classroom-notification-bar{display:flex;align-items:center;justify-content:flex-end;padding:0}.notification-bell-wrap{position:relative;display:inline-flex}.notification-bell-btn{position:relative;width:42px;height:42px;padding:0;border-radius:var(--radius-full);border:1px solid var(--border-bright);background:var(--bg-card);color:var(--text-secondary);display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease}.notification-bell-btn:hover{background:var(--bg-card-high);border-color:var(--primary);color:var(--primary)}.notification-bell-btn.has-unread{color:#3b82f6;border-color:#3b82f6;animation:bellPulse 1.5s ease-in-out infinite}.notification-bell-badge{position:absolute;top:6px;right:6px;width:9px;height:9px;border-radius:50%;background:#3b82f6;box-shadow:0 0 8px #3b82f699}@keyframes bellPulse{0%,to{box-shadow:0 0 #3b82f666}50%{box-shadow:0 0 0 10px #3b82f600}}.notification-dropdown{position:absolute;top:calc(100% + var(--space-2));right:0;width:340px;max-height:420px;overflow-y:auto;background:#0f172af2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-bright);border-radius:var(--radius-xl);box-shadow:0 20px 60px #00000080,0 0 40px #3b82f614;z-index:200;animation:dropdownSlide .2s ease}@keyframes dropdownSlide{0%{opacity:0;transform:translateY(-8px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}.notification-dropdown-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--border)}.notification-dropdown-title{font-size:var(--font-size-sm);font-weight:700;color:var(--text-primary)}.notification-dropdown-count{font-size:var(--font-size-xs);color:var(--text-secondary);font-weight:500}.notification-dropdown-empty{display:flex;align-items:center;justify-content:center;padding:var(--space-8) var(--space-4);color:var(--text-muted);font-size:var(--font-size-sm)}.notification-dropdown-list{padding:var(--space-2);display:flex;flex-direction:column;gap:var(--space-2)}.notification-card{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3);background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);transition:border-color .15s ease}.notification-card:hover{border-color:var(--border-bright)}.notification-card-body{flex:1;min-width:0}.notification-card-message{font-size:var(--font-size-sm);font-weight:600;color:var(--text-primary);margin:0 0 var(--space-1) 0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.notification-card-timer{font-size:var(--font-size-xs);color:var(--text-link);font-weight:500}.notification-launch-btn{flex-shrink:0;padding:.4rem .85rem;border-radius:var(--radius-md);border:none;background:linear-gradient(135deg,#3b82f6,#2563eb);color:#fff;font-size:var(--font-size-xs);font-weight:700;cursor:pointer;transition:all .15s ease;box-shadow:0 2px 8px #3b82f659;white-space:nowrap}.notification-launch-btn:hover{background:linear-gradient(135deg,#2563eb,#1d4ed8);box-shadow:0 4px 16px #3b82f680;transform:translateY(-1px)}.countdown-overlay{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;animation:overlayFadeIn .3s ease}@keyframes overlayFadeIn{0%{opacity:0}to{opacity:1}}.countdown-overlay-backdrop{position:absolute;inset:0;background:#020617d9;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.countdown-overlay-content{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:var(--space-5);padding:var(--space-10) var(--space-8);background:#0f172ae6;-webkit-backdrop-filter:blur(24px);backdrop-filter:blur(24px);border:1px solid var(--border-bright);border-radius:var(--radius-2xl);box-shadow:0 25px 80px #0009,0 0 80px #3b82f61a,inset 0 1px #ffffff0d;min-width:340px;max-width:440px;text-align:center;animation:contentSlideUp .4s cubic-bezier(.16,1,.3,1)}@keyframes contentSlideUp{0%{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.countdown-close-btn{position:absolute;top:var(--space-3);right:var(--space-3);width:32px;height:32px;padding:0;border-radius:var(--radius-full);border:1px solid var(--border);background:transparent;color:var(--text-secondary);font-size:.85rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s ease}.countdown-close-btn:hover{background:var(--bg-card-high);border-color:var(--border-bright);color:var(--text-primary)}.countdown-message{font-size:var(--font-size-xl);font-weight:700;color:var(--text-primary);letter-spacing:-.02em;margin:0;line-height:1.3}.countdown-from{font-size:var(--font-size-sm);color:var(--text-secondary);margin:0}.countdown-ring-wrap{position:relative;display:flex;align-items:center;justify-content:center}.countdown-ring-svg{transform:scaleX(-1)}.countdown-ring-progress{transition:stroke-dashoffset 1s linear,stroke .3s ease}.countdown-ring-inner{position:absolute;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-1)}.countdown-digits{font-size:3rem;font-weight:800;font-variant-numeric:tabular-nums;letter-spacing:-.04em;color:var(--text-primary);line-height:1;transition:color .3s ease}.countdown-digits.urgent{color:#ef4444;animation:urgentFlash 1s ease-in-out infinite}@keyframes urgentFlash{0%,to{opacity:1}50%{opacity:.6}}.countdown-label{font-size:var(--font-size-sm);color:var(--text-secondary);font-weight:500;text-transform:uppercase;letter-spacing:.08em}.countdown-finished-text{font-size:var(--font-size-2xl);font-weight:800;color:#22c55e;letter-spacing:-.02em}.countdown-overlay.finished .countdown-overlay-content{border-color:#22c55e4d;box-shadow:0 25px 80px #0009,0 0 80px #22c55e1f}.countdown-done-btn{margin-top:var(--space-2)}.notification-form-section{margin-top:var(--space-4);padding-top:var(--space-4);border-top:1px solid var(--border)}.notification-form-title{font-size:var(--font-size-sm);font-weight:700;color:var(--text-primary);margin-bottom:var(--space-3)}.notification-form{display:flex;flex-direction:column;gap:var(--space-3)}.notification-form label{display:flex;flex-direction:column;gap:var(--space-1);font-size:var(--font-size-xs);font-weight:600;color:var(--text-secondary)}.notification-form input[type=text],.notification-form input[type=number]{width:100%;padding:.5rem .75rem;border-radius:var(--radius-md);border:1px solid var(--border-bright);background:var(--bg-input);color:var(--text-primary);font-size:var(--font-size-sm);transition:border-color .15s ease,box-shadow .15s ease}.notification-form input[type=text]:focus,.notification-form input[type=number]:focus{outline:none;border-color:var(--border-focus);box-shadow:0 0 0 3px var(--primary-glow)}.notification-form input::placeholder{color:var(--text-muted)}.notification-send-btn{font-size:var(--font-size-xs)!important;padding:.5rem .9rem!important}@media(max-width:600px){.notification-dropdown{width:290px;right:-8px}.countdown-overlay-content{min-width:280px;padding:var(--space-8) var(--space-5)}.countdown-digits{font-size:2.5rem}}.verification-pending{padding:var(--space-4) 0}.verification-pending p{margin-bottom:var(--space-3);color:var(--text-secondary)}.verification-result{min-height:400px;display:flex;flex-direction:column;justify-content:center}.verification-result h2{margin-bottom:var(--space-3);color:var(--text-primary)}.verification-result p{margin-bottom:var(--space-6)}.options-menu-container{position:relative;display:inline-block}.options-menu-trigger{padding:.5rem!important;border-radius:50%!important;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border)!important;background:var(--bg-surface)!important;color:var(--text-secondary);transition:all var(--ease-fast)}.options-menu-trigger:hover{background:var(--bg-card-high)!important;color:var(--text-primary);border-color:var(--primary)!important;box-shadow:0 0 10px #3b82f633}.options-dropdown-menu{position:absolute;top:100%;right:0;margin-top:.5rem;width:220px;background:#0d1b2af2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-bright);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg),0 0 15px #00000080;z-index:1000;display:flex;flex-direction:column;padding:.25rem;animation:slideInDown .15s ease-out}@keyframes slideInDown{0%{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}.options-dropdown-item{width:100%;display:flex;align-items:center;gap:var(--space-3);padding:.65rem .85rem!important;background:transparent!important;border:none!important;color:var(--text-secondary)!important;text-align:left;border-radius:var(--radius-md)!important;font-weight:500!important;transition:all var(--ease-fast)!important;font-size:var(--font-size-sm)!important}.options-dropdown-item:hover{background:var(--primary)!important;color:var(--on-primary)!important}.options-dropdown-item .icon{font-size:1.1rem}.custom-modal-overlay{position:fixed;inset:0;background:#030712cc;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:9999;animation:fadeInModal .2s ease-out}@keyframes fadeInModal{0%{opacity:0}to{opacity:1}}.custom-modal-content{background:var(--bg-card);border:1px solid var(--border-bright);border-radius:var(--radius-xl);padding:var(--space-8);width:90%;max-width:460px;position:relative;box-shadow:var(--shadow-card),0 10px 40px #0009,0 0 20px #3b82f626;animation:scaleUpModal .25s cubic-bezier(.34,1.56,.64,1)}@keyframes scaleUpModal{0%{opacity:0;transform:scale(.92) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.custom-modal-close{position:absolute;top:1rem;right:1rem;background:transparent!important;border:none!important;color:var(--text-secondary)!important;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%!important;cursor:pointer;transition:all var(--ease-fast)!important;font-size:1rem!important;padding:0!important}.custom-modal-close:hover{background:var(--bg-card-high)!important;color:var(--text-primary)!important;transform:rotate(90deg)}@keyframes quiz-pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.4);opacity:.55}}@keyframes quiz-ring{0%{transform:scale(1);opacity:.6}to{transform:scale(2);opacity:0}}@keyframes timer-warn{0%,to{color:var(--error)}50%{color:#f99}}@keyframes slide-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes bar-fill{0%{width:0%}}.quiz-card{display:flex;flex-direction:column;height:100%;background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border);overflow:hidden;font-family:var(--font-family);animation:slide-in .25s ease both}.quiz-live-dot{position:relative;width:10px;height:10px;border-radius:var(--radius-full);background:#ef4444;flex-shrink:0;animation:quiz-pulse 1.8s ease-in-out infinite}.quiz-live-dot:after{content:"";position:absolute;inset:-2px;border-radius:var(--radius-full);background:#ef444466;animation:quiz-ring 1.8s ease-out infinite}.quiz-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) var(--space-4);background:var(--bg-card-high);border-bottom:1px solid var(--border);flex-shrink:0;gap:var(--space-3);min-height:52px}.quiz-header-left{display:flex;align-items:center;gap:var(--space-2);min-width:0}.quiz-header-title{font-family:"Manrope",var(--font-family);font-size:var(--font-size-base);font-weight:700;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.quiz-header-right{display:flex;align-items:center;gap:var(--space-3);flex-shrink:0}.quiz-timer{display:flex;align-items:center;gap:var(--space-1);padding:var(--space-1) var(--space-3);background:var(--bg-surface);border:1px solid var(--border-bright);border-radius:var(--radius-md);font-family:JetBrains Mono,monospace;font-size:var(--font-size-sm);font-weight:500;color:var(--text-secondary);min-width:64px;justify-content:center;letter-spacing:.04em;transition:border-color var(--ease-fast),color var(--ease-fast)}.quiz-timer.warn{border-color:var(--error-border);color:var(--error);animation:timer-warn .8s ease infinite}.quiz-students-badge{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-1) var(--space-3);background:#0ea5e914;border:1px solid rgba(14,165,233,.2);border-radius:var(--radius-md);font-size:var(--font-size-xs);font-weight:600;color:var(--secondary);font-family:JetBrains Mono,monospace;letter-spacing:.02em;white-space:nowrap}.quiz-body{flex:1;overflow-y:auto;padding:var(--space-5) var(--space-5);display:flex;flex-direction:column;gap:var(--space-5);scroll-behavior:smooth}.quiz-body::-webkit-scrollbar{width:4px}.quiz-body::-webkit-scrollbar-track{background:transparent}.quiz-body::-webkit-scrollbar-thumb{background:var(--border-bright);border-radius:4px}.quiz-meta-row{display:flex;align-items:flex-end;justify-content:space-between;gap:var(--space-4);flex-wrap:wrap}.quiz-subject-tag{font-family:JetBrains 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var(--border);background:var(--bg-surface);cursor:pointer;transition:border-color var(--ease-fast),background var(--ease-fast);position:relative;text-align:left;width:100%}.quiz-option:hover:not(:disabled):not(.selected):not(.correct):not(.incorrect){border-color:var(--primary-dim);background:#3b82f60a}.quiz-option.selected{border-color:var(--primary);background:#3b82f614}.quiz-option.correct{border-color:var(--success-border);background:var(--success-bg)}.quiz-option.incorrect{border-color:var(--error-border);background:var(--error-bg)}.quiz-option:disabled{cursor:default}.quiz-option-letter{width:32px;height:32px;border-radius:var(--radius-md);border:2px solid var(--border-bright);background:var(--bg-card);display:flex;align-items:center;justify-content:center;font-family:JetBrains Mono,monospace;font-size:var(--font-size-xs);font-weight:700;color:var(--text-secondary);flex-shrink:0;transition:border-color var(--ease-fast),background var(--ease-fast),color var(--ease-fast)}.quiz-option.selected .quiz-option-letter{border-color:var(--primary);background:var(--primary);color:var(--on-primary)}.quiz-option.correct .quiz-option-letter{border-color:var(--success);background:var(--success-bg);color:var(--success)}.quiz-option.incorrect .quiz-option-letter{border-color:var(--error);background:var(--error-bg);color:var(--error)}.quiz-option-text{font-size:var(--font-size-base);color:var(--text-secondary);line-height:1.45;flex:1;transition:color var(--ease-fast)}.quiz-option.selected .quiz-option-text,.quiz-option:hover:not(:disabled) .quiz-option-text{color:var(--text-primary)}.quiz-option.correct .quiz-option-text{color:var(--success)}.quiz-option.incorrect .quiz-option-text{color:var(--error)}.quiz-result-bar-wrap{flex:1;display:flex;flex-direction:column;gap:var(--space-1)}.quiz-result-bar-track{height:6px;background:var(--bg-card);border-radius:var(--radius-full);overflow:hidden}.quiz-result-bar-fill{height:100%;background:var(--primary);border-radius:var(--radius-full);transition:width .6s cubic-bezier(.4,0,.2,1)}.quiz-result-bar-fill.is-correct{background:var(--success)}.quiz-result-label{display:flex;justify-content:space-between;font-size:var(--font-size-xs);color:var(--text-muted);font-family:JetBrains Mono,monospace}.quiz-context{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-4);display:flex;gap:var(--space-3)}.quiz-context-icon{font-size:1.1rem;flex-shrink:0;margin-top:2px;color:var(--text-muted)}.quiz-context-text{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:1.6}.quiz-footer{display:flex;align-items:center;justify-content:flex-end;gap:var(--space-3);padding:var(--space-3) var(--space-5);border-top:1px solid var(--border);background:var(--bg-card-high);flex-shrink:0}.quiz-stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:var(--space-3)}.quiz-stat-cell{background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-3) var(--space-3);display:flex;flex-direction:column;gap:var(--space-1)}.quiz-stat-label{font-size:var(--font-size-xs);color:var(--text-muted);font-family:JetBrains 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var(--success-border);border-radius:var(--radius-md);font-size:var(--font-size-sm);font-weight:600;color:var(--success)}.quiz-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;gap:var(--space-3);padding:var(--space-10);text-align:center;color:var(--text-muted)}.quiz-empty-icon{font-size:2.5rem;opacity:.4}@media(max-width:900px){.quiz-title-text{font-size:var(--font-size-xl)}.quiz-question-text{font-size:var(--font-size-base);padding:var(--space-4)}.quiz-options{padding:0 var(--space-4) var(--space-4)}.quiz-body{padding:var(--space-3) var(--space-3);gap:var(--space-3)}.quiz-stats-row{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.quiz-progress-bar{width:80px}.quiz-header-title{font-size:var(--font-size-sm)}}@keyframes sq-pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.4);opacity:.55}}@keyframes sq-ring{0%{transform:scale(1);opacity:.6}to{transform:scale(2);opacity:0}}@keyframes 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var(--space-3);background:var(--bg-surface);border:1px solid var(--border-bright);border-radius:var(--radius-md);font-family:JetBrains Mono,monospace;font-size:var(--font-size-sm);font-weight:500;color:var(--text-secondary);min-width:64px;justify-content:center;letter-spacing:.04em;transition:border-color var(--ease-fast),color var(--ease-fast)}.sq-timer.warn{border-color:var(--error-border);color:var(--error);animation:sq-timer-warn .8s ease infinite}.sq-student-badge{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-1) var(--space-3);background:#0ea5e914;border:1px solid rgba(14,165,233,.2);border-radius:var(--radius-md);font-size:var(--font-size-xs);font-weight:600;color:var(--secondary);font-family:JetBrains Mono,monospace;letter-spacing:.02em;white-space:nowrap}.sq-progress-track{height:4px;background:var(--bg-surface);flex-shrink:0;border-bottom:1px solid var(--border)}.sq-progress-fill{height:100%;background:var(--primary);transition:width .5s cubic-bezier(.4,0,.2,1);animation:sq-bar-fill .6s ease both}.sq-main{flex:1;overflow-y:auto;padding:var(--space-5);display:flex;flex-direction:column;gap:var(--space-5);scroll-behavior:smooth}.sq-main::-webkit-scrollbar{width:4px}.sq-main::-webkit-scrollbar-track{background:transparent}.sq-main::-webkit-scrollbar-thumb{background:var(--border-bright);border-radius:4px}.sq-waiting{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;gap:var(--space-4);text-align:center;padding:var(--space-10);animation:sq-slide-in .3s ease both}.sq-waiting-pulse{width:80px;height:80px;border-radius:var(--radius-full);background:#3b82f614;border:2px solid rgba(59,130,246,.2);display:flex;align-items:center;justify-content:center;animation:sq-waiting-bob 2.4s ease-in-out 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var(--border);background:#3b82f60a}.sq-review-label{font-size:var(--font-size-xs);font-weight:700;color:var(--primary);font-family:JetBrains Mono,monospace;text-transform:uppercase;letter-spacing:.08em;flex-shrink:0}.sq-review-qtext{font-size:var(--font-size-sm);color:var(--text-secondary);line-height:1.5}.sq-review-answer{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4)}.sq-review-answer-letter{width:28px;height:28px;border-radius:var(--radius-sm);border:2px solid var(--success-border);background:var(--success-bg);display:flex;align-items:center;justify-content:center;font-family:JetBrains Mono,monospace;font-size:var(--font-size-xs);font-weight:700;color:var(--success);flex-shrink:0}.sq-review-answer-text{font-size:var(--font-size-sm);color:var(--text-secondary);flex:1}.sq-review-tag{font-size:var(--font-size-xs);font-family:JetBrains Mono,monospace;font-weight:600;padding:2px var(--space-2);border-radius:var(--radius-sm);flex-shrink:0}.sq-review-tag.correct{background:var(--success-bg);border:1px solid var(--success-border);color:var(--success)}@media(max-width:640px){.sq-question-text{font-size:var(--font-size-base);padding:var(--space-4)}.sq-header{padding:var(--space-2) var(--space-3)}.sq-main{padding:var(--space-3);gap:var(--space-3)}.sq-end-stats{grid-template-columns:1fr 1fr}.sq-result-score-num{font-size:3rem}.sq-btn{width:100%;min-width:unset}.sq-footer{padding:var(--space-3)}.sq-waiting{padding:var(--space-6) var(--space-4)}}