:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;color:#1d2431;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;background:#f5f6f8;font-family:Avenir Next,Segoe UI,system-ui,sans-serif}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed}.batch-lesson{--lesson-ink:#1d2431;--lesson-muted:#626c7c;--lesson-blue:#315bdb;--lesson-line:#dde1e7;--lesson-surface:#f5f6f8;--lesson-radius:8px;background:var(--lesson-surface);letter-spacing:0;min-height:100vh;font-size:16px;line-height:1.65}.batch-lesson ::selection{color:#172448;background:#d7e1ff}.batch-lesson :focus-visible{outline-offset:4px;outline:3px solid #7196fa}.batch-lesson button{letter-spacing:0}.batch-lesson button,.batch-lesson summary,.batch-lesson a{touch-action:manipulation}.batch-lesson a{color:inherit;text-decoration:none}.batch-lesson p,.batch-lesson h1,.batch-lesson h2{margin:0}.lesson-nav{align-items:center;gap:26px;max-width:1280px;height:76px;margin:auto;padding:20px 44px;display:flex}.lesson-brand{align-items:center;gap:8px;font-family:Avenir Next,system-ui,sans-serif;font-size:27px;font-weight:750;line-height:1;display:inline-flex}.lesson-brand-dot{color:var(--lesson-blue);margin-left:-8px}.lesson-brand-icon{width:31px;height:31px;color:var(--lesson-blue);place-items:center;display:grid}.lesson-course-name{color:var(--lesson-muted);font-size:13px}.lesson-nav>button{margin-left:auto}.lesson-text-button{color:#596374;background:0 0;border:0;justify-content:center;align-items:center;gap:8px;min-height:40px;padding:9px 0;font-size:14px;display:inline-flex}.lesson-text-button:hover{color:var(--lesson-blue)}.lesson-stage{max-width:1192px;margin:0 auto;padding:4px 24px 0}.lesson-chapters{justify-content:center;gap:0;max-width:660px;margin:6px auto 24px;display:flex}.lesson-chapters>div{color:#79818e;white-space:nowrap;border-bottom:1px solid #dfe3e9;flex:1;justify-content:center;align-items:center;gap:10px;padding:9px 10px;font-size:13px;display:flex}.lesson-chapters>div>span:first-child{font-variant-numeric:tabular-nums;place-items:center;width:19px;height:19px;font-size:11px;display:grid}.lesson-chapters>div[data-active=true]{color:var(--lesson-blue);border-bottom:2px solid var(--lesson-blue);font-weight:650}.lesson-chapters>div[data-past=true]{color:#485c72}.lesson-heading{text-align:center;min-height:92px}.lesson-heading h1{text-wrap:balance;font-size:32px;font-weight:650;line-height:1.45}.lesson-heading p{color:var(--lesson-muted);margin-top:12px;font-size:16px}.lesson-exhibit{margin-top:3px;position:relative}.lesson-exhibit-bar{min-height:34px;color:var(--lesson-muted);justify-content:space-between;align-items:center;padding:0 15px;font-size:12px;display:flex}.lesson-identity{color:#3757ae;align-items:center;gap:8px;font-size:13px;display:inline-flex}.lesson-identity i{background:#3861e9;border-radius:2px;width:14px;height:9px;display:inline-block}.lesson-running-label{text-align:right;flex-wrap:wrap;justify-content:flex-end;align-items:center;gap:4px 18px;display:flex}.lesson-identity,.lesson-clock{flex-shrink:0}.lesson-clock{color:#2d374a;font-variant-numeric:tabular-nums}.lesson-clock small{color:#747d8a;font-size:11px}.lesson-model{height:280px;position:relative}.lesson-canvas{position:absolute;inset:0}.lesson-canvas canvas{width:100%;height:100%;display:block}.lesson-zone-labels{color:#6a7585;text-align:center;pointer-events:none;font-size:13px;position:absolute;inset:0}.lesson-zone-labels>span{white-space:nowrap;position:absolute;top:0;left:0}.lesson-zone-labels span[data-active=true]{color:var(--lesson-blue);font-weight:650}.lesson-scene-caption{color:#687282;justify-content:center;align-items:center;gap:10px;min-height:42px;padding:4px 12px;font-size:14px;display:flex}.lesson-scene-caption>span:not(.lesson-mini-ticket){overflow-wrap:anywhere}.lesson-mini-ticket{width:25px;height:22px;color:var(--lesson-blue);background:#edf1ff;border:1px solid #c9d4fa;border-radius:4px;flex-shrink:0;place-items:center;font-size:12px;font-weight:650;display:inline-grid}.lesson-caption-stat{border-right:1px solid var(--lesson-line);gap:9px;padding:0 14px;font-size:13px;display:inline-flex}.lesson-caption-stat:last-child{border:0}.lesson-caption-stat b{color:#273445;font-variant-numeric:tabular-nums;font-weight:650}.lesson-action-area{flex-direction:column;justify-content:flex-start;align-items:center;min-height:90px;padding:17px 0 27px;display:flex}.lesson-action-row,.lesson-choice-row{flex-wrap:wrap;justify-content:center;align-items:center;gap:22px;display:flex}.lesson-choice-row{gap:14px}.lesson-primary,.lesson-secondary{border-radius:var(--lesson-radius);justify-content:center;align-items:center;gap:14px;min-height:46px;padding:11px 22px;font-size:14px;font-weight:600;line-height:1.45;transition:background .15s,color .15s,transform .15s;display:inline-flex}.lesson-primary svg,.lesson-secondary svg,.lesson-text-button svg{flex-shrink:0}.lesson-primary{color:#fff;background:#26334b;border:1px solid #0000}.lesson-primary:hover{background:#354c75}.lesson-secondary{color:#33405a;background:#fff;border:1px solid #cbd1dc}.lesson-secondary:hover{background:#edf1f8;border-color:#a6b5d1}.lesson-primary:active,.lesson-secondary:active{transform:translateY(1px)}.lesson-primary:disabled{color:#87909e;background:#e2e5ec}.lesson-icon-button{color:#435371;background:#fff;border:1px solid #d7dde6;border-radius:6px;flex-shrink:0;place-items:center;width:38px;height:38px;display:inline-grid}.lesson-icon-button:hover{background:#e9eef8}.lesson-input{flex-direction:column;gap:8px;width:min(100%,520px);margin-bottom:19px;display:flex}.lesson-input label{color:#576579;font-size:13px}.lesson-input input{color:#273445;caret-color:#315bdb;background:#fff;border:1px solid #c7cfdb;border-radius:8px;width:100%;min-width:0;padding:12px 15px;font-size:16px}.lesson-input>span{color:#687588;font-size:12px}.lesson-playback{align-items:center;gap:16px;width:min(100%,420px);display:flex}.lesson-progress{background:#dde3ec;flex:1;height:3px;overflow:hidden}.lesson-progress i{transform-origin:0;background:#4163ca;width:100%;height:100%;display:block}.lesson-results{border-top:1px solid var(--lesson-line);max-width:920px;margin:8px auto 40px;padding:26px 24px 0;animation:.35s ease-out lesson-reveal}.lesson-section-heading{justify-content:space-between;align-items:center;gap:18px;margin-bottom:20px;display:flex}.lesson-section-heading h2{font-size:21px;font-weight:650}.lesson-section-heading>span{color:#78818d;font-size:12px}.lesson-table-row{border-bottom:1px solid #e0e4e9;grid-template-columns:1fr 1fr 1fr;align-items:center;gap:24px;min-height:87px;display:grid}.lesson-table-head{color:#707b8b;min-height:38px;font-size:13px}.lesson-table-row>strong{font-size:14px;font-weight:600}.lesson-table-row>div{padding:7px 0 15px;position:relative}.lesson-table-row b{color:#2d477c;font-variant-numeric:tabular-nums;font-size:24px;font-weight:550}.lesson-table-row small{color:#738096;margin-left:7px;font-size:11px}.lesson-result-bar{background:#5479de;border-radius:2px;height:3px;display:block;position:absolute;bottom:7px}.lesson-result-bar[data-total]{background:#c29d40}.lesson-takeaway{color:#364d4b;align-items:flex-start;gap:12px;margin:26px 0;font-size:15px;line-height:1.8;display:flex}.lesson-takeaway-icon{color:#247b5e;background:#e4eee8;border-radius:50%;flex-shrink:0;place-items:center;width:30px;height:30px;display:grid}.lesson-next-experiment{color:#747e8c;flex-direction:column;gap:16px;margin-top:32px;font-size:13px;display:flex}.lesson-next-experiment>div{flex-wrap:wrap;gap:12px;display:flex}.lesson-notes{border-top:1px solid var(--lesson-line);max-width:920px;margin:0 auto;padding:26px 24px 38px}.lesson-notes-heading{color:#7b8390;justify-content:space-between;align-items:center;margin-bottom:17px;font-size:13px;display:flex}.lesson-notes details{border-bottom:1px solid #e1e5eb}.lesson-notes summary{cursor:pointer;color:#414d60;justify-content:space-between;align-items:center;gap:14px;padding:18px 0;font-size:15px;list-style:none;display:flex}.lesson-notes summary::-webkit-details-marker{display:none}.lesson-notes summary svg{color:#7c899b;flex-shrink:0;transition:transform .2s}.lesson-notes details[open] summary svg{transform:rotate(180deg)}.lesson-notes details p{color:#646f7f;max-width:72ch;margin:0 0 16px;font-size:15px;line-height:1.9}.lesson-notes details a{color:#315bdb;text-underline-offset:4px;align-items:center;gap:5px;margin-bottom:22px;font-size:14px;text-decoration:underline;display:inline-flex}.lesson-footer{color:#7b8491;justify-content:space-between;gap:20px;max-width:1192px;margin:auto;padding:16px 24px 28px;font-size:12px;display:flex}.lesson-footer>span>span{margin-left:14px}.lesson-scene-loading{color:#7b8ca9;flex-direction:column;justify-content:center;align-items:center;gap:16px;height:280px;font-size:14px;display:flex}.lesson-flat{justify-content:space-around;align-items:stretch;gap:15px;height:290px;padding:45px 15px;display:flex}.lesson-flat>div{background:#eef1f5;border-bottom:2px solid #cbd4e4;flex:1;padding:12px}.lesson-flat strong{font-size:14px;font-weight:500}.lesson-flat>div>div{flex-wrap:wrap;gap:6px;margin-top:20px;display:flex}.lesson-flat span{background:#eac668;border-radius:4px;place-items:center;width:39px;height:33px;display:grid}.lesson-flat span[data-mine=true]{color:#fff;background:#3861e9}.lesson-dialog::backdrop{background:#15203666}.lesson-dialog{color:#26334a;background:#fff;border:0;border-radius:8px;width:calc(100% - 40px);max-width:480px;max-height:calc(100dvh - 40px);margin:auto;padding:40px;position:fixed;box-shadow:0 20px 80px #10274522}.lesson-dialog-close{border:0;position:absolute;top:16px;right:16px}.lesson-dialog h2{margin:20px 0 14px;font-size:24px}.lesson-dialog p{color:#677488;margin:14px 0;font-size:15px;line-height:1.85}.lesson-dialog .lesson-primary{margin-top:12px}@keyframes lesson-reveal{0%{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}@media (width>=1500px){.lesson-model{height:390px}.lesson-stage{padding-top:18px}.lesson-chapters{margin-bottom:44px}}@media (width<=650px){.lesson-nav{gap:10px;height:66px;padding:14px 20px}.lesson-brand{font-size:24px}.lesson-course-name{display:none}.lesson-nav .lesson-text-button{font-size:12px}.lesson-stage{padding:0 18px}.lesson-chapters{margin:5px 0 22px}.lesson-chapters>div{gap:5px;padding:9px 2px;font-size:12px}.lesson-chapters>div>span:first-child{width:15px;font-size:10px}.lesson-heading{min-height:105px;padding:0 5px}.lesson-heading h1{max-width:310px;margin:auto;font-size:25px;line-height:1.3}.lesson-heading p{text-wrap:pretty;margin-top:10px;font-size:15px;line-height:1.6}.lesson-exhibit-bar{gap:8px;min-height:35px;padding:0}.lesson-exhibit-note{font-size:11px}.lesson-identity{font-size:12px}.lesson-running-label{gap:2px 9px;font-size:11px}.lesson-model{height:290px}.lesson-canvas{inset:0}.lesson-zone-labels{font-size:12px}.lesson-scene-caption{min-height:55px;padding:8px 0;font-size:12px}.lesson-scene-caption>span:not(.lesson-mini-ticket){max-width:280px}.lesson-caption-stat{padding:0 11px;font-size:12px}.lesson-action-area{min-height:83px;padding-top:13px}.lesson-primary,.lesson-secondary{gap:10px;min-height:46px;padding:12px 17px;font-size:13px}.lesson-choice-row{flex-wrap:nowrap;gap:10px;width:100%}.lesson-choice-row button{flex:1}.lesson-results{margin-top:0;padding:24px 20px 0}.lesson-section-heading{flex-wrap:wrap;align-items:baseline;gap:6px 10px}.lesson-section-heading h2{font-size:18px}.lesson-section-heading>span{white-space:nowrap;font-size:12px}.lesson-table-row{grid-template-columns:.85fr 1fr 1fr;gap:12px}.lesson-table-head,.lesson-table-row>strong{font-size:12px}.lesson-table-row b{font-size:23px}.lesson-table-row small{margin:0;font-size:12px;display:block}.lesson-takeaway{font-size:14px}.lesson-next-experiment>div{flex-direction:column}.lesson-notes{padding:24px 22px 30px}.lesson-notes summary{padding:17px 0;font-size:14px}.lesson-notes details p{font-size:14px}.lesson-footer{flex-direction:column;gap:4px;padding:10px 22px 25px;font-size:11px}.lesson-scene-loading{height:290px}.lesson-dialog{padding:30px 24px}.lesson-dialog h2{font-size:22px}}@media (prefers-reduced-motion:reduce){.batch-lesson *,.batch-lesson :before,.batch-lesson :after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}