:root{--bg-main:#f0f4f8;--bg-card:#fff;--bg-card-hover:#f8fafc;--bg-sidebar:linear-gradient(180deg, #1a2942 0%, #0f1b2d 100%);--primary:#2563eb;--primary-hover:#3b82f6;--accent:#14b8a6;--accent-light:#2dd4bf;--cyan:#0ea5e9;--success:#10b981;--success-hover:#0d9f74;--danger:#ef4444;--danger-hover:#dc2626;--warning:#f59e0b;--warning-hover:#d97706;--info:#0ea5e9;--text-main:#0f172a;--text-muted:#64748b;--text-sidebar:#e2e8f0;--text-sidebar-muted:#e2e8f073;--border:#e2e8f0;--border-light:#f1f5f9;--border-focus:#2563eb;--sidebar-width:240px;--topbar-height:56px;--toolbar-height:60px;--touch-target:56px;--font-base:16px;--font-sm:14px;--font-xs:12px;--font-lg:20px;--font-xl:24px;--font-xxl:32px;--gap:12px;--gap-sm:8px;--gap-lg:24px;--gap-xl:36px;--radius:10px;--radius-sm:8px;--radius-lg:16px;--radius-xl:20px;--shadow-sm:0 1px 3px #0f1b2d0f, 0 4px 12px #0f1b2d0f;--shadow-md:0 2px 8px #0f1b2d14, 0 8px 24px #0f1b2d1a;--shadow-lg:0 4px 16px #0f1b2d1a, 0 16px 48px #0f1b2d24;--transition:.2s cubic-bezier(.25, .46, .45, .94);--transition-fast:.15s cubic-bezier(.25, .46, .45, .94);--spring:cubic-bezier(.25, .46, .45, .94);--level-1:#94a3b8;--level-2:#10b981;--level-3:#f59e0b;--level-4:#ef4444;--level-5:#2563eb;--level-6:#8b5cf6;--level-7:#ec4899;--level-8:#0ea5e9;--color-primary:var(--primary);--color-error:var(--danger);--color-danger:var(--danger);--font-md:15px;--gap-md:16px;--text-primary:var(--text-main);--text-secondary:var(--text-muted)}[data-theme=dark]{--bg-main:#0d1521;--bg-card:#162033;--bg-card-hover:#1c2a42;--text-main:#e2e8f0;--text-muted:#94a3b8;--text-sidebar:#e2e8f0;--text-sidebar-muted:#e2e8f066;--border:#e2e8f014;--border-light:#e2e8f00d;--shadow-sm:0 1px 3px #0000004d, 0 4px 12px #0000004d;--shadow-md:0 2px 8px #0006, 0 8px 24px #0006;--shadow-lg:0 4px 16px #00000073, 0 16px 48px #00000080}[data-theme=dark] .topbar,[data-theme=dark] .main-topbar{background:#162033d9;border-bottom-color:#e2e8f014}[data-theme=dark] .context-bar{border-bottom-color:#e2e8f014}[data-theme=dark] .ctx-bell:hover{background:#e2e8f014}[data-theme=dark] .topbar-online,[data-theme=dark] .topbar-bell:hover{background:#e2e8f00f}[data-theme=dark] .modal-close-btn,[data-theme=dark] .qa-close-btn,[data-theme=dark] .tk-panel-close{background:#e2e8f014}[data-theme=dark] .modal-close-btn:hover,[data-theme=dark] .qa-close-btn:hover,[data-theme=dark] .tk-panel-close:hover{background:#e2e8f029}[data-theme=dark] .form-input{border-color:#e2e8f024}[data-theme=dark] .tab-bar{background:#e2e8f00f}[data-theme=dark] .tab-item.active{box-shadow:0 1px 4px #0006}[data-theme=dark] ::-webkit-scrollbar-thumb{background:#e2e8f029}[data-theme=dark] ::-webkit-scrollbar-thumb:hover{background:#e2e8f047}[data-theme=dark] .quick-actions-bar{border-color:#e2e8f01a}[data-theme=dark] .qa-btn{background:#e2e8f014}[data-theme=dark] .qa-btn:hover{background:#e2e8f024}[data-theme=dark] .mode-switcher{background:#e2e8f00f}[data-theme=dark] .mode-switcher .mode-btn:hover{background:#e2e8f01a}[data-theme=dark] .mode-switcher .mode-btn.active{background:var(--bg-card-hover);box-shadow:0 1px 4px #0006}[data-theme=dark] .timer-menu{border-color:#e2e8f01a}[data-theme=dark] .timer-menu-btn:hover{background:#e2e8f014}[data-theme=dark] .toolkit-menu{box-shadow:var(--shadow-lg), 0 0 0 1px #e2e8f014}[data-theme=dark] .toolkit-menu-item:hover{background:#e2e8f00f}[data-theme=dark] .toolkit-menu-item:active{background:#e2e8f01a}[data-theme=dark] .tk-panel{box-shadow:var(--shadow-lg), 0 0 0 1px #e2e8f014}[data-theme=dark] .tk-ring-bg{stroke:#e2e8f01a}[data-theme=dark] .tk-preset-btn{background:#e2e8f014}[data-theme=dark] .tk-ctrl--ghost{background:#e2e8f01a}[data-theme=dark] .tk-ctrl--ghost:not(:disabled):hover{background:#e2e8f029}[data-theme=dark] .tk-adj-btn{background:#e2e8f014}[data-theme=dark] .dash-pulse-student:hover{background:#e2e8f00f}[data-theme=dark] .whiteboard-toolbar .tool-group{border-right-color:#e2e8f014}[data-theme=dark] .tool-btn:hover{background:#e2e8f014}[data-theme=dark] .wb-toolbar{background:#162033e0;border-color:#e2e8f01a;box-shadow:0 8px 32px #00000073,0 2px 8px #0000004d}[data-theme=dark] .wb-toolbar-group{border-right-color:#e2e8f01a}[data-theme=dark] .quick-color{border-color:#e2e8f02e}[data-theme=dark] .group-member-chip{background:#e2e8f00f}[data-theme=dark] .leaderboard-item{border-bottom-color:#e2e8f00f}[data-theme=dark] .leaderboard-item:hover{background:#e2e8f00a}[data-theme=dark] .ai-chat-panel{border-left-color:#e2e8f014;box-shadow:-4px 0 32px #00000073}[data-theme=dark] .ai-chat-header{border-bottom-color:#e2e8f014}[data-theme=dark] .ai-chat-close:hover{background:#e2e8f014}[data-theme=dark] .ai-quick-prompts{border-bottom-color:#e2e8f00f}[data-theme=dark] .ai-message--ai .ai-message-bubble{color:var(--text-main);background:#e2e8f014}[data-theme=dark] .ai-message--thinking .ai-message-bubble{background:#e2e8f00f}[data-theme=dark] .ai-chat-input-row{border-top-color:#e2e8f014}[data-theme=dark] .ai-chat-input{color:var(--text-main);border-color:#e2e8f024}[data-theme=dark] .ai-suggestion-dismiss{border-color:#e2e8f024}[data-theme=dark] .ai-suggestion-dismiss:hover{background:#e2e8f014}[data-theme=dark] .ai-report-text{color:var(--text-main);background:#e2e8f00d}[data-theme=dark] .ai-quiz-question{background:#e2e8f00d}[data-theme=dark] .ai-quiz-letter{background:#e2e8f01a}[data-theme=dark] .ai-quiz-footer{border-top-color:#e2e8f014}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,Inter,Segoe UI,sans-serif;font-size:var(--font-base);letter-spacing:-.01em;color:var(--text-main);background:var(--bg-main);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;touch-action:manipulation;font-weight:400;line-height:1.5;overflow:hidden}#app{flex-direction:column;width:100vw;height:100vh;display:flex;overflow:hidden}.app-shell{flex-direction:row;flex:auto;min-height:0;display:flex;overflow:hidden}.loading-screen{background:var(--bg-main);width:100%;height:100%;color:var(--text-main);flex-direction:column;justify-content:center;align-items:center;gap:20px;display:flex}.loading-bear{font-size:72px;animation:1.2s cubic-bezier(.45,.05,.55,.95) infinite bounce}.loading-text{letter-spacing:-.02em;color:var(--text-main);font-size:28px;font-weight:600}.loading-spinner{border:3px solid #2563eb1f;border-top-color:var(--primary);border-radius:50%;width:36px;height:36px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-14px)}}.sidebar{width:var(--sidebar-width);min-width:0;color:var(--text-sidebar);z-index:10;transition:width .25s var(--spring);background:linear-gradient(#1a2942 0%,#0f1b2d 100%);flex-direction:column;flex-shrink:0;padding:0;display:flex;overflow:hidden auto}.sidebar-logo{background:linear-gradient(#2563eb0f 0%,#0000 100%);border-bottom:1px solid #2563eb33;flex-shrink:0;align-items:center;gap:10px;padding:20px 16px 16px;display:flex;position:relative;overflow:hidden}.sidebar-bear{color:var(--accent-light,#2dd4bf);flex-shrink:0;justify-content:center;align-items:center;display:flex}.sidebar-title{letter-spacing:-.01em;color:#fff;white-space:nowrap;transition:opacity .15s ease, width .25s 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option{color:var(--text-main);background:var(--bg-card);font-weight:500}.ctx-pill-select::-ms-expand{display:none}.ctx-right{flex:1;justify-content:flex-end;align-items:center;gap:8px;display:flex}.ctx-clock{color:var(--text-main);white-space:nowrap;font-variant-numeric:tabular-nums;font-feature-settings:"tnum";letter-spacing:.04em;font-size:20px;font-weight:600}.ctx-bell{min-height:unset;min-width:unset;border-radius:var(--radius-sm);width:32px;height:32px;color:var(--text-muted);cursor:pointer;transition:background var(--transition-fast), color var(--transition-fast);background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;padding:0;display:flex}.ctx-bell:hover{color:var(--text-main);filter:none;background:#0000000d}.ctx-bell:active{filter:none;transform:scale(.92)}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (width<=600px){.context-bar{gap:6px;padding:0 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auto;align-items:center;gap:10px;display:grid}.overview-note-avatar{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;font-size:12px;font-weight:600;display:flex}.overview-note-info{flex-direction:column;gap:2px;min-width:0;display:flex}.overview-note-name{color:var(--text,#0f172a);font-size:13px;font-weight:600}.overview-note-text{color:var(--text-muted,#64748b);white-space:nowrap;text-overflow:ellipsis;font-size:12px;overflow:hidden}.overview-note-time{color:var(--text-muted,#64748b);white-space:nowrap;font-size:11px}.overview-goals-list{flex-direction:column;gap:10px;display:flex}.overview-goal-row{flex-direction:column;gap:4px;display:flex}.overview-goal-head{justify-content:space-between;align-items:center;display:flex}.overview-goal-student{color:var(--text,#0f172a);font-size:12px;font-weight:600}.overview-goal-percent{color:var(--text-muted,#64748b);font-size:12px}.overview-goal-track{background:#0000000f;border-radius:999px;height:6px;overflow:hidden}.overview-goal-fill{background:linear-gradient(90deg,#14b8a6,#22c55e);height:100%;transition:width 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100%)}body.season-christmas:before{content:"";pointer-events:none;z-index:9998;background-image:radial-gradient(circle at 20% 0,#fffc 1px,#0000 1px),radial-gradient(circle at 80% 10%,#ffffffb3 1.5px,#0000 1.5px),radial-gradient(circle at 50% 5%,#fff9 1px,#0000 1px),radial-gradient(circle at 30% 15%,#ffffffe6 1px,#0000 1px),radial-gradient(circle at 70% 20%,#ffffffb3 1.5px,#0000 1.5px);background-size:300px 300px,400px 400px,250px 250px,350px 350px,450px 450px;animation:8s linear infinite snow-fall;position:fixed;inset:0}@keyframes snow-fall{0%{background-position:0 -300px,0 -400px,0 -250px,0 -350px,0 -450px}to{background-position:0 100vh,0 100vh,0 100vh,0 100vh,0 100vh}}body.season-easter{--season-accent:#a855f7;--season-accent-soft:#a855f71a}body.season-easter .student-card{border-left-color:var(--season-accent)}body.season-summer{--season-accent:#0891b2;--season-accent-soft:#0891b21a}body.season-halloween{--season-accent:#ea580c;--season-accent-soft:#ea580c1f}body.season-halloween .sidebar{background:linear-gradient(#2d1906 0%,#1a0e04 100%)}.group-drag-chip{cursor:grab;background:var(--bg-main);font-size:var(--font-sm);border:1px solid var(--border);-webkit-user-select:none;user-select:none;transition:opacity var(--transition-fast), box-shadow var(--transition-fast);border-radius:999px;align-items:center;gap:6px;padding:5px 10px;display:flex}.group-drag-chip:active{cursor:grabbing}.group-drag-chip.dragging{opacity:.4}.group-drag-chip--member{background:#2563eb1a;border-color:#2563eb4d}.group-chip-remove{cursor:pointer;color:var(--danger);background:0 0;border:none;padding:0 0 0 4px;font-size:16px;line-height:1}.group-drop-zone{border:2px dashed var(--border);border-radius:var(--radius);flex-wrap:wrap;align-content:flex-start;gap:6px;min-height:120px;max-height:200px;padding:8px;transition:border-color .2s,background .2s;display:flex;overflow-y:auto}.group-drop-zone--over{border-color:var(--primary);background:#2563eb0a}.group-drop-hint{color:var(--text-muted);font-size:var(--font-sm);text-align:center;pointer-events:none;align-self:center;width:100%}.wb-float-preview{border-radius:var(--radius);width:120px;height:80px;box-shadow:var(--shadow-lg);cursor:pointer;z-index:400;transition:transform var(--transition), box-shadow var(--transition);background:#fff;border:2px solid #ffffff4d;position:fixed;bottom:90px;right:16px;overflow:hidden}.wb-float-preview:hover{transform:scale(1.06);box-shadow:0 8px 32px #0000002e}.wb-float-preview img{object-fit:cover;width:100%;height:100%;display:block}.wb-float-preview[hidden]{display:none}#qa-voice.qa-btn--active{color:var(--danger);background:#ff3b3026;animation:1s infinite alternate voice-pulse}@keyframes voice-pulse{0%{box-shadow:0 0 #ff3b304d}to{box-shadow:0 0 0 8px #ff3b3000}}.spotlight-overlay{z-index:9000;-webkit-backdrop-filter:blur(6px);background:#00000073;justify-content:center;align-items:flex-start;padding-top:15vh;animation:.15s spotlight-in;display:flex;position:fixed;inset:0}@keyframes spotlight-in{0%{opacity:0}to{opacity:1}}.spotlight-box{background:var(--bg-card);border-radius:var(--radius-xl);width:min(600px,92vw);box-shadow:var(--shadow-lg), 0 0 0 1px var(--border);flex-direction:column;max-height:70vh;display:flex;overflow:hidden}.spotlight-input{width:100%;font-size:var(--font-lg);color:var(--text-main);border:none;border-bottom:1px solid var(--border);background:0 0;outline:none;padding:18px 20px;font-family:inherit}.spotlight-results{flex:1;padding:6px;overflow-y:auto}.spotlight-item{border-radius:var(--radius);cursor:pointer;text-align:left;width:100%;color:var(--text-main);font-family:inherit;font-size:var(--font-sm);transition:background var(--transition-fast);background:0 0;border:none;align-items:center;gap:12px;padding:11px 14px;display:flex}.spotlight-item--active,.spotlight-item:hover{background:#2563eb14}.spotlight-item-icon{text-align:center;flex-shrink:0;width:28px;font-size:20px}.spotlight-item-body{flex-direction:column;gap:1px;min-width:0;display:flex}.spotlight-item-label{font-weight:500}.spotlight-item-sub{font-size:var(--font-xs);color:var(--text-muted)}.spotlight-empty{text-align:center;color:var(--text-muted);font-size:var(--font-sm);padding:24px}.offline-banner{z-index:800;color:#fff;font-size:var(--font-xs);text-align:center;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#ff9500eb;padding:6px 16px;font-weight:600;animation:.3s offline-slide-up;position:fixed;bottom:0;left:0;right:0}@keyframes offline-slide-up{0%{transform:translateY(100%)}to{transform:translateY(0)}}.reaction-emoji{pointer-events:none;z-index:10;font-size:28px;animation:1.5s forwards reaction-pop;position:absolute;top:8px;right:8px}.student-card{position:relative}@keyframes reaction-pop{0%{opacity:0;transform:scale(.5)translateY(0)}20%{opacity:1;transform:scale(1.2)translateY(-4px)}80%{opacity:1;transform:scale(1)translateY(-8px)}to{opacity:0;transform:scale(.9)translateY(-16px)}}@keyframes leaderboard-flash{0%{background:0 0}20%{background:#ffc40059;box-shadow:0 0 12px #ffc40066}to{background:0 0}}.leaderboard-flash{animation:.6s leaderboard-flash}