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.15s}.btn-star-leaderboard:hover{background:#f8fafc;border-color:#94a3b8}.btn-star-all-reward{color:#0f172a;cursor:pointer;white-space:nowrap;background:#fff;border:1px solid #cbd5e1;border-radius:6px;padding:4px 9px;font-size:.75rem;font-weight:750;transition:all .15s}.btn-star-all-reward:hover{background:#f8fafc;border-color:#94a3b8}.seat-quick-reward-bar{text-align:center;margin:12px 0 16px}.btn-quick-reward-star{color:#0f172a;cursor:pointer;background:#fefce8;border:1.5px solid #fde047;border-radius:9px;width:100%;padding:9px;font-size:.86rem;font-weight:800;transition:all .15s}.btn-quick-reward-star:hover{background:#fef08a}.btn-picker-reward-star{color:#0f172a;cursor:pointer;background:#fefce8;border:1px solid #fde047;border-radius:8px;padding:8px 14px;font-weight:800}.classroom-toast-banner{color:#fff;z-index:99999;background:#0f172a;border-radius:999px;padding:10px 22px;font-size:.92rem;font-weight:800;position:fixed;top:20px;left:50%;transform:translate(-50%);box-shadow:0 10px 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.15s}.btn-clock-ctrl.start{background:#22c55e}.btn-clock-ctrl.start:hover{background:#16a34a}.btn-clock-ctrl.pause{background:#eab308}.btn-clock-ctrl.pause:hover{background:#ca8a04}.btn-clock-ctrl.reset{background:#64748b}.btn-clock-ctrl.reset:hover{background:#475569}.btn-clock-ctrl.add{background:#0ea5e9}.btn-clock-ctrl.add:hover{background:#0284c7}.leaderboard-modal-backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:10000;background:#0f172aa6;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.leaderboard-modal-card{background:#fff;border-radius:20px;flex-direction:column;width:min(540px,100%);max-height:85vh;padding:26px;display:flex;position:relative;box-shadow:0 25px 60px #00000040}.leaderboard-sub-title{color:#475569;margin:-4px 0 14px;font-size:.85rem}.leaderboard-list-wrap{border:1px solid 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label{color:#0f172a;margin-bottom:6px;font-size:.86rem;font-weight:750;display:block}.modal-input-group input{color:#0f172a;border:1.5px solid #cbd5e1;border-radius:8px;width:100%;padding:10px 12px;font-size:1rem}.modal-actions{justify-content:flex-end;gap:10px;display:flex}.btn-confirm{color:#fff;cursor:pointer;background:#0ea5e9;border:1px solid #0ea5e9;border-radius:10px;padding:9px 18px;font-weight:800;transition:background .15s}.btn-confirm:hover{background:#0284c7}.btn-cancel{color:#0f172a;cursor:pointer;background:#f8fafc;border:1px solid #cbd5e1;border-radius:10px;padding:9px 16px;font-weight:750}.modal-close-btn,.buzzer-close-btn,.picker-close-btn{color:#94a3b8;cursor:pointer;background:0 0;border:none;font-size:1.2rem;position:absolute;top:16px;right:18px}.picker-pure-stage{background:#f8fafc;border:2px dashed #cbd5e1;border-radius:18px;place-items:center;min-height:130px;margin:20px 0;padding:42px 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pure-firework;position:absolute;top:50%;left:50%}.firework-particle.p1{--tx:-90px;--ty:-70px;background:#ef4444;animation-delay:30ms}.firework-particle.p2{--tx:90px;--ty:-70px;background:#3b82f6;animation-delay:60ms}.firework-particle.p3{--tx:-110px;--ty:10px;background:#10b981;animation-delay:90ms}.firework-particle.p4{--tx:110px;--ty:10px;background:#f59e0b;animation-delay:.12s}.firework-particle.p5{--tx:-70px;--ty:80px;background:#8b5cf6;animation-delay:.15s}.firework-particle.p6{--tx:70px;--ty:80px;background:#ec4899;animation-delay:.18s}.firework-particle.p7{--tx:0px;--ty:-95px;background:#06b6d4;animation-delay:.21s}.firework-particle.p8{--tx:0px;--ty:95px;background:#eab308;animation-delay:.24s}.firework-particle.p9{--tx:-130px;--ty:-25px;background:#f97316;animation-delay:.27s}.firework-particle.p10{--tx:130px;--ty:-25px;background:#6366f1;animation-delay:.3s}.firework-particle.p11{--tx:-45px;--ty:-90px;background:#14b8a6;animation-delay:.33s}.firework-particle.p12{--tx:45px;--ty:-90px;background:#d946ef;animation-delay:.36s}@keyframes pure-firework{0%{opacity:0;transform:translate(-50%,-50%)scale(.3)}25%{opacity:1;transform:translate(calc(-50% + var(--tx)*.7),calc(-50% + var(--ty)*.7)) scale(1.3)}80%{opacity:1;transform:translate(calc(-50% + var(--tx)),calc(-50% + var(--ty))) scale(1)}to{opacity:0;transform:translate(calc(-50% + var(--tx)*1.15),calc(-50% + var(--ty)*1.15 + 15px)) scale(.6)}}.picker-actions{justify-content:center;gap:10px;display:flex}.group-size-bar{flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;margin:10px 0 14px;display:flex}.group-size-label{color:#0f172a;font-size:.82rem;font-weight:750}.group-size-pill{color:#0f172a;cursor:pointer;background:#f8fafc;border:1px solid #cbd5e1;border-radius:8px;padding:4px 10px;font-size:.78rem;font-weight:750;transition:all 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.15s}.btn-timer-ctrl.start{background:#22c55e}.btn-timer-ctrl.start:hover{background:#16a34a}.btn-timer-ctrl.pause{background:#eab308}.btn-timer-ctrl.pause:hover{background:#ca8a04}.btn-timer-ctrl.reset{color:#0f172a;background:#f1f5f9;border:1px solid #cbd5e1}.btn-timer-ctrl.reset:hover{background:#e2e8f0}.btn-timer-ctrl.add{color:#0284c7;background:#f0f9ff;border:1px solid #7dd3fc}.btn-timer-ctrl.add:hover{background:#e0f2fe}.buzzer-countdown-display{padding:24px 0}.countdown-number{color:#ef4444;font-size:4.8rem;font-weight:900;animation:.8s infinite pulse}@keyframes pulse{50%{opacity:.5}}.buzzer-ready-display{padding:16px 0}.buzzer-big-button{color:#fff;cursor:pointer;background:radial-gradient(circle at 35% 35%,#ef4444,#b91c1c);border:6px solid #fecaca;border-radius:50%;place-items:center;width:170px;height:170px;margin:0 auto;font-size:1.3rem;font-weight:900;transition:transform .1s,box-shadow .1s;display:grid;box-shadow:0 15px 35px #ef444473}.buzzer-big-button:hover{transform:scale(1.05);box-shadow:0 20px 45px #ef44448c}.buzzer-big-button:active{transform:scale(.96)}.buzzer-big-button.buzzed{box-shadow:none;cursor:not-allowed;background:#64748b;border-color:#cbd5e1}.buzzer-hint{color:#475569;margin-top:14px;font-size:.84rem}.buzzer-winner-display{padding:12px 0}.winner-crown{font-size:3.2rem;animation:1s infinite bounce}@keyframes bounce{0%,to{animation-timing-function:cubic-bezier(.8,0,1,1);transform:translateY(-25%)}50%{animation-timing-function:cubic-bezier(0,0,.2,1);transform:none}}.winner-name{color:#0f172a;margin:10px 0 14px;font-size:1.7rem}.winner-name b{color:#0284c7}.buzzer-reset-actions{justify-content:center;gap:10px;display:flex}@media (max-width:980px){.classroom-feedback-layout{grid-template-columns:1fr;gap:20px}}.header-right-controls{flex-wrap:nowrap;align-items:center;gap:5px;display:flex}.btn-reset-seats-inline{color:#0f172a;cursor:pointer;white-space:nowrap;background:#fff;border:1px solid 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