:root{--brand:#2f6fed;--brand-dark:#1f4fbc;--brand-soft:#2f6fed1a;--success:#16a34a;--success-soft:#16a34a1f;--danger:#dc2626;--danger-soft:#dc26261a;--warning:#b45309;--warning-soft:#b453091f;--text:#101828;--text-muted:#667085;--text-faint:#98a2b3;--border:#e4e7ec;--surface:#fff;--surface-soft:#f8fafc;--sidebar:#0f172a;--sidebar-text:#cbd5e1;--radius-sm:8px;--radius:14px;--radius-lg:20px;--shadow-sm:0 1px 2px #1018280f;--shadow:0 12px 32px #10182814;--shadow-lg:0 24px 60px #1018281f;--seat-cell:56px}*{box-sizing:border-box}html,body,#app{height:100%}body{color:var(--text);background:var(--surface-soft);-webkit-font-smoothing:antialiased;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.auth-page{background:var(--surface-soft);grid-template-columns:minmax(0,1.05fr) 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0}.seat-cell.is-seat{white-space:normal;word-break:break-all;border-style:solid;border-color:var(--border);background:var(--surface);color:var(--text);font-weight:500;line-height:1.2}.seat-cell.is-seat.is-assigned{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-dark)}.seat-cell.is-podium{border-style:solid;border-color:var(--brand);background:var(--brand);color:#fff;letter-spacing:2px;font-weight:600}.seat-cell.is-door{border-style:solid;border-color:var(--warning);background:var(--warning-soft);color:var(--warning)}.seat-cell.is-aisle{background:repeating-linear-gradient(45deg, var(--surface-soft), var(--surface-soft) 6px, var(--surface) 6px, var(--surface) 12px);border-style:dashed}.seat-toolbar{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:12px;display:flex}.seat-tool{border:1px solid var(--border);background:var(--surface);color:var(--text-muted);cursor:pointer;border-radius:999px;padding:6px 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28px;font-size:14px;line-height:1.9}.user-auth-features{gap:12px;margin:0;padding:0;list-style:none;display:grid}.user-auth-features li{color:#cbd5e1;align-items:center;gap:10px;font-size:13px;display:flex}.user-auth-dot{background:#2f6fed40;border:1px solid #93c5fd80;border-radius:50%;flex:none;width:18px;height:18px;position:relative}.user-auth-dot:after{content:"";background:#93c5fd;border-radius:50%;position:absolute;inset:5px}.user-auth-aside-foot{z-index:1;color:#64748b;margin:0;font-size:12px;position:relative}.user-auth-body{justify-content:center;align-items:center;min-height:100vh;padding:40px 24px;display:flex}.user-login-card{background:var(--surface);border:1px solid var(--border);width:100%;max-width:420px;box-shadow:var(--shadow-lg);border-radius:24px;padding:36px 34px}.login-switch{background:var(--surface-soft);border:1px solid var(--border);border-radius:12px;gap:4px;margin-bottom:26px;padding:4px;display:flex}.login-switch 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.15s;display:flex;position:relative}.resource-item:hover{background:#f8faf5}.resource-item.active{color:#3f6450;background:#eef6ec;border-color:#e0eddb}.resource-icon{border-radius:8px;flex:none;justify-content:center;align-items:center;width:30px;height:30px;display:inline-flex}.resource-info{flex-direction:column;flex:1;min-width:0;display:flex}.resource-info strong{color:#5d6a5f;text-overflow:ellipsis;white-space:nowrap;font-size:9px;font-weight:500;overflow:hidden}.resource-item.active .resource-info strong{color:#2e4f3c;font-weight:600}.resource-info small{color:#a0aaa0;margin-top:2px;font-size:7px}.resource-item.active .resource-info small{color:#779079}.resource-tip{color:#8c998d;background:#f7f9f3;border-radius:7px;align-items:flex-start;gap:5px;padding:8px;font-size:7px;line-height:1.6;display:flex}.resource-tip svg{flex:none;margin-top:1px}.resource-actions{flex-direction:column;gap:6px;margin-top:10px;display:flex}.resource-actions 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.stage-chalk-center>span{font-size:13px}.player-stage:fullscreen .stage-play{width:104px;height:104px;margin:28px 0 15px}.player-stage:fullscreen .stage-chalk-meta{gap:18px 52px;padding-top:20px;font-size:14px}.player-stage:fullscreen .stage-paper{padding:34px}.player-stage:fullscreen .paper-sheet{width:min(1180px,100%);margin:0 auto;padding:48px 58px}.player-stage:fullscreen .paper-head h3{font-size:clamp(34px,4vw,58px)}.player-stage:fullscreen .paper-head>p{font-size:15px}.player-stage:fullscreen .paper-line>p{font-size:13px}.player-stage:fullscreen .paper-line>span{font-size:11px}@media (width<=1280px){.player-layout{grid-template-columns:minmax(0,1fr) 280px}.player-title-block strong{max-width:250px}}@media (width<=1060px){.player-layout{grid-template-columns:1fr}.player-resources{grid-template-columns:1fr 1fr;gap:0 16px;display:grid}.resource-head,.resource-tip,.resource-actions{grid-column:span 2}.resource-list{grid-column:span 2;grid-template-columns:1fr 1fr;display:grid}.resource-actions{flex-direction:row}.resource-actions .outline-wide-btn{flex:1;margin-top:0}}@media (width<=900px){.player-topbar{flex-wrap:wrap;align-items:flex-start}.player-topbar-actions{border-top:1px solid #eef2ea;justify-content:flex-end;width:100%;padding-top:8px}.player-progress-text{margin-right:auto}.player-stage{height:360px}}@media (width<=760px){.player-topbar{padding:10px}.player-title-block strong{max-width:190px;font-size:10px}.player-back{font-size:8px}.player-topbar-actions .btn-secondary,.player-topbar-actions .btn-primary{height:34px;padding:0 9px;font-size:9px}.player-stage{height:310px;min-height:310px}.stage-chalk{border-width:4px;padding:14px}.stage-chalk-center h2{font-size:24px}.stage-chalk-meta{gap:5px 12px;font-size:7px}.stage-play{width:50px;height:50px;margin:12px 0 8px}.paper-sheet{padding:18px}.lesson-chips button{height:28px;font-size:7px}.player-footbar{flex-direction:column;align-items:flex-start}.player-foot-actions{width:100%}.player-foot-actions .btn-secondary,.player-foot-actions .btn-primary{flex:1;font-size:9px}.player-resources,.resource-list{display:flex}}.stage-annotation{z-index:7;pointer-events:none;touch-action:none;width:100%;height:100%;position:absolute;inset:0}.stage-annotation.is-drawing{pointer-events:auto;cursor:crosshair}.stage-spotlight{z-index:9;pointer-events:none;border-radius:50%;width:240px;height:240px;position:absolute;transform:translate(-50%,-50%);box-shadow:0 0 0 9999px #030d099e}.board-tools{z-index:20;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#081812e0;border:1px solid #ffffff24;border-radius:13px;align-items:center;gap:2px;max-width:calc(100vw - 28px);padding:5px;display:flex;position:absolute;bottom:18px;left:50%;overflow-x:auto;transform:translate(-50%);box-shadow:0 14px 36px #00000057}.board-tools::-webkit-scrollbar{display:none}.board-tool-group{align-items:center;gap:2px;display:flex}.board-tool,.board-icon-btn,.board-exit{color:#e7f1e9ad;cursor:pointer;background:0 0;border:0;border-radius:8px;flex:none;height:36px;font-family:inherit;transition:background .15s,color .15s}.board-tool{align-items:center;gap:4px;padding:0 8px;font-size:9px;display:inline-flex}.board-icon-btn{justify-content:center;align-items:center;width:36px;padding:0;display:inline-flex}.board-tool:hover,.board-icon-btn:hover{color:#f2f8ef;background:#ffffff17}.board-tool.active,.board-icon-btn.active{color:#1d3a28;background:var(--t-lime)}.board-tool.active:hover,.board-icon-btn.active:hover{color:#1d3a28;background:#d5f47c}.board-sep{background:#ffffff24;flex:none;width:1px;height:22px;margin:0 4px}.board-colors{align-items:center;gap:4px;padding:0 3px;display:flex}.board-color{cursor:pointer;border:2px solid #ffffff29;border-radius:50%;flex:none;width:17px;height:17px;padding:0;transition:transform .15s,box-shadow .15s}.board-color:hover{transform:scale(1.1)}.board-color.active{border-color:#f3f8ef;box-shadow:0 0 0 2px #e7ff9c8c}.board-widths{align-items:center;gap:1px;padding:0 2px;display:flex}.board-width{cursor:pointer;background:0 0;border:0;border-radius:6px;justify-content:center;align-items:center;width:22px;height:32px;padding:0;display:inline-flex}.board-width>span{background:#d8e4d8;border-radius:50%}.board-width.active{background:#ffffff1f}.board-width.active>span{background:var(--t-lime)}.board-exit{color:#ffd8cd;background:#be583e33;align-items:center;gap:4px;padding:0 9px;font-size:9px;display:inline-flex}.board-exit:hover{color:#fff3ef;background:#be583e5c}.timer-float{z-index:18;color:#e9f2e9;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);touch-action:none;background:#081812f0;border:1px solid #ffffff26;border-radius:16px;width:300px;max-width:calc(100vw - 20px);padding:16px;position:absolute;box-shadow:0 22px 56px #00000061}.timer-head{cursor:grab;-webkit-user-select:none;user-select:none;justify-content:space-between;align-items:flex-start;gap:10px;display:flex}.timer-head:active{cursor:grabbing}.timer-title{align-items:center;gap:9px;display:flex}.timer-grip{opacity:.5;background-image:radial-gradient(circle,#e7f1e9d9 1.3px,#0000 1.3px);background-size:5px 5px;flex:none;width:10px;height:24px}.timer-title>div{flex-direction:column;display:flex}.timer-title strong{color:#f1f8ef;font-size:12px;font-weight:600}.timer-title small{color:#e5f0e77a;margin-top:2px;font-size:7px}.timer-close{color:#e7f1e999;cursor:pointer;background:#ffffff0f;border:0;border-radius:7px;flex:none;justify-content:center;align-items:center;width:26px;height:26px;padding:0;display:inline-flex}.timer-close:hover{color:#f6fbf4;background:#ffffff1f}.timer-body{margin-top:12px}.timer-clock-row{justify-content:space-between;align-items:flex-end;gap:10px;display:flex}.timer-clock-row>strong{color:#f5faf2;font-family:var(--t-mono);letter-spacing:-.02em;font-size:46px;line-height:1}.timer-state{color:#e7f1e994;background:#ffffff12;border-radius:5px;align-items:center;gap:5px;height:22px;margin-bottom:3px;padding:0 7px;font-size:8px;display:inline-flex}.timer-state:before{content:"";background:#9aa99b;border-radius:50%;width:5px;height:5px}.timer-state.running{color:#d8ff8f;background:#c9f16921}.timer-state.running:before{background:var(--t-lime);animation:1.2s ease-in-out infinite timer-pulse;box-shadow:0 0 0 3px #c9f16929}.timer-state.done{color:#ffb7a4;background:#ef7a5924}.timer-state.done:before{background:#ef7a59}@keyframes timer-pulse{0%,to{opacity:1}50%{opacity:.35}}.timer-progress{background:#ffffff17;border-radius:99px;height:5px;margin:10px 0 12px;overflow:hidden}.timer-progress>span{border-radius:inherit;background:linear-gradient(90deg, #9ed33c, var(--t-lime));height:100%;transition:width .25s linear;display:block}.timer-presets{grid-template-columns:repeat(5,1fr);gap:4px;margin-bottom:10px;display:grid}.timer-presets button{color:#e7f1e999;cursor:pointer;background:0 0;border:1px solid #ffffff1c;border-radius:6px;height:29px;padding:0;font-family:inherit;font-size:8px}.timer-presets button:hover{color:#eef7ec;background:#ffffff12}.timer-presets button.active{color:#1d3a28;background:var(--t-lime);border-color:var(--t-lime);font-weight:600}.timer-actions{grid-template-columns:1fr 1.35fr 1fr 1fr;gap:4px;display:grid}.timer-actions button{color:#e7f1e9bd;cursor:pointer;background:#ffffff0f;border:1px solid #ffffff1f;border-radius:7px;height:33px;padding:0 4px;font-family:inherit;font-size:8px}.timer-actions button:hover{background:#ffffff1c}.timer-actions .timer-primary{color:#1d3a28;background:var(--t-lime);border-color:var(--t-lime);font-size:9px;font-weight:600}.timer-actions .timer-primary:hover{background:#d5f47c}.player-stage:fullscreen .stage-chalk{padding-bottom:96px}.player-stage:fullscreen .stage-paper{padding-bottom:90px}@media (width<=1100px){.board-tool span{display:none}.board-tool{justify-content:center;width:36px;padding:0}}@media (width<=760px){.board-tools{gap:1px;padding:4px;bottom:10px}.board-tool,.board-icon-btn{width:33px;height:33px}.board-sep{margin:0 2px}.board-colors{gap:3px}.board-widths{display:none}.board-exit{height:33px;padding:0 7px}.player-stage:fullscreen .stage-chalk{padding:14px 12px 96px}.player-stage:fullscreen .stage-chalk-top span:first-child{white-space:nowrap;font-size:12px}.player-stage:fullscreen .stage-chalk-top span:last-child{display:none}.player-stage:fullscreen .stage-chalk-center h2{font-size:34px}.player-stage:fullscreen .stage-chalk-center p{font-size:11px}.player-stage:fullscreen .stage-chalk-center>span{font-size:10px}.player-stage:fullscreen .stage-play{width:64px;height:64px;margin:16px 0 10px}.player-stage:fullscreen .stage-chalk-meta{gap:5px 16px;padding-top:12px;font-size:10px}.board-tools{overflow:visible}.board-colors{background:#081812e6;border:1px solid #ffffff24;border-radius:20px;padding:6px 10px;position:absolute;bottom:46px;left:50%;transform:translate(-50%);box-shadow:0 10px 24px #00000047}.board-color{width:17px;height:17px}}@media (width<=360px){.board-exit{display:none}.board-tool,.board-icon-btn{width:30px;height:31px}}.stage-annotation.tool-pen{cursor:url(/cursors/pen.png) 4 29,crosshair}.stage-annotation.tool-highlighter{cursor:url(/cursors/highlighter.png) 4 29,crosshair}.stage-annotation.tool-eraser{cursor:url(/cursors/eraser.png) 5 24,crosshair}.resource-empty{border:1px dashed var(--t-border);color:var(--t-faint);text-align:center;border-radius:9px;padding:16px 12px;font-size:9px}.picker-overlay{z-index:19;color:#edf5ee;-webkit-backdrop-filter:blur(9px);backdrop-filter:blur(9px);background:radial-gradient(80% 80% at 50% 10%,#1a4a3959,#0000 70%),#05120dc2;justify-content:center;align-items:center;padding:24px;animation:.2s ease-out both picker-fade;display:flex;position:absolute;inset:0;overflow:hidden}.picker-close{z-index:30;color:#e9f2e9;cursor:pointer;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#081812b3;border:1px solid #ffffff29;border-radius:9px;justify-content:center;align-items:center;width:36px;height:36px;padding:0;display:inline-flex;position:absolute;top:18px;right:18px}.picker-close:hover{background:#081812e6}@keyframes picker-fade{0%{opacity:0}to{opacity:1}}.picker-setup{color:#263b2d;background:#fbfcf8;border-radius:18px;flex-direction:column;width:min(900px,100%);max-height:100%;padding:22px;display:flex;overflow:hidden;box-shadow:0 34px 90px #0000005c}.picker-setup-head{border-bottom:1px solid #e9eee4;justify-content:space-between;align-items:flex-start;gap:20px;padding-bottom:15px;display:flex}.picker-setup-head h2{color:#1d3327;letter-spacing:-.04em;margin:5px 0 0;font-size:26px;line-height:1.15}.picker-setup-head p:not(.panel-eyebrow){color:#839084;margin:6px 0 0;font-size:9px;line-height:1.6}.picker-total{background:#f0f6e7;border-radius:10px;flex:none;align-items:baseline;gap:4px;padding:9px 12px;display:flex}.picker-total b{color:#4e6d36;font-family:var(--t-mono);font-size:23px;line-height:1}.picker-total small{color:#83927f;font-size:8px}.picker-setup-body{flex:1;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:16px;min-height:0;padding-top:15px;display:grid}.picker-roster{background:#f7f9f3;border:1px solid #e9eee4;border-radius:12px;flex-direction:column;min-height:0;display:flex;overflow:hidden}.picker-roster>header{border-bottom:1px solid #e9eee4;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;display:flex}.picker-roster>header strong{font-size:10px}.picker-roster>header>div{gap:4px;display:flex}.picker-roster>header button{color:#6f7f6d;cursor:pointer;background:#fff;border:1px solid #e0e8da;border-radius:5px;height:23px;padding:0 8px;font-family:inherit;font-size:8px}.picker-roster>header button:hover{color:#36513f;border-color:#c8d8bd}.picker-roster-list{scrollbar-width:thin;scrollbar-color:#d7e0d2 transparent;flex-direction:column;flex:1;gap:2px;min-height:0;padding:7px;display:flex;overflow-y:auto}.picker-student{cursor:pointer;border:1px solid #0000;border-radius:8px;align-items:center;gap:8px;padding:6px 8px;transition:background .14s,border-color .14s;display:flex}.picker-student:hover{background:#eef4e8}.picker-student.checked{background:#f1f8e6;border-color:#e4eedb}.picker-student.picked{opacity:.68}.picker-student input{accent-color:#467a3d;cursor:pointer;flex:none;width:14px;height:14px;margin:0}.picker-student-info{flex-direction:column;flex:1;min-width:0;display:flex}.picker-student-info strong{color:#445446;font-size:9px;font-weight:500}.picker-student-info small{color:#98a297;margin-top:1px;font-size:7px}.picker-student em{color:#a87842;background:#fbf1df;border-radius:4px;flex:none;padding:2px 5px;font-size:7px;font-style:normal}.picker-empty{color:#98a297;text-align:center;padding:24px;font-size:9px}.picker-settings{flex-direction:column;gap:10px;min-height:0;display:flex}.picker-setting>span{color:#7f8c80;margin-bottom:5px;font-size:8px;display:block}.picker-round-sizes{grid-template-columns:repeat(5,1fr);gap:4px;display:grid}.picker-round-sizes button{color:#718071;cursor:pointer;background:#fff;border:1px solid #e1e8dc;border-radius:6px;height:30px;font-family:inherit;font-size:8px}.picker-round-sizes button:hover{border-color:#c8d8bd}.picker-round-sizes button.active{color:#1f3a29;background:var(--t-lime);border-color:#b6d957;font-weight:600}.picker-switch{cursor:pointer;background:#fff;border:1px solid #e7ede1;border-radius:9px;align-items:center;gap:8px;padding:9px 10px;display:flex}.picker-switch>input{accent-color:#467a3d;flex:none;width:14px;height:14px;margin:0}.picker-switch>span{flex-direction:column;display:flex}.picker-switch strong{color:#5a695b;font-size:8px;font-weight:600}.picker-switch small{color:#9aa49a;margin-top:1px;font-size:7px}.picker-pool{color:#6e7d6e;background:#f3f7ee;border-radius:8px;justify-content:space-between;align-items:center;padding:8px 10px;font-size:8px;display:flex}.picker-pool strong{color:#46703b;font-family:var(--t-mono);font-size:20px;line-height:1}.picker-pool small{font-family:var(--t-font);font-size:7px;font-weight:400}.picker-start{color:#1d3a28;background:var(--t-lime);cursor:pointer;border:0;border-radius:9px;justify-content:center;align-items:center;gap:6px;height:40px;font-family:inherit;font-size:10px;font-weight:600;transition:background .15s,opacity .15s;display:inline-flex}.picker-start:hover:not(:disabled){background:#d5f47c}.picker-start:disabled{opacity:.4;cursor:not-allowed}.picker-history{flex-direction:column;flex:1;min-height:0;padding-top:2px;display:flex}.picker-history>header{justify-content:space-between;align-items:center;margin-bottom:5px;display:flex}.picker-history>header strong{color:#6d7b6d;font-size:8px}.picker-history>header span{color:#a3aca2;font-family:var(--t-mono);font-size:7px}.picker-history-list{scrollbar-width:thin;scrollbar-color:#d7e0d2 transparent;border-top:1px solid #edf1e9;min-height:0;max-height:156px;overflow-y:auto}.picker-history-row{border-bottom:1px solid 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