@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');
:root{--ink:#182332;--muted:#626d7d;--blue:#183ae2;--yellow:#ffd45a;--line:#dee4ed;--paper:#f5f7fb;--white:#fff;font-family:'DM Sans',Arial,sans-serif;color:var(--ink);background:var(--paper);font-size:16px}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #f4a800;outline-offset:4px}button{border:0}a{color:var(--blue)}[hidden]{display:none!important}.header{height:92px;padding:0 5.5%;background:#fff;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:11px;font-family:'Space Grotesk',sans-serif;font-size:32px;line-height:.95;font-weight:700;color:var(--ink);text-decoration:none;letter-spacing:-1.4px}.brand-icon{display:grid;place-items:center;width:44px;height:44px;background:var(--blue);color:var(--yellow);border-radius:12px;font-size:32px}.brand-small{display:block;font-family:'DM Sans',sans-serif;font-size:10px;letter-spacing:2.2px;font-weight:650;margin-top:7px}.course-label{display:flex;gap:14px;align-items:center;font-size:14px;color:var(--muted)}.pill{padding:8px 12px;border:1px solid var(--line);border-radius:6px;color:#3f4b5f}.button{display:inline-flex;gap:9px;align-items:center;justify-content:center;font-weight:650;border-radius:8px;padding:13px 19px;min-height:46px}.button-outline{background:#fff;border:1px solid #cbd4e3}.button-outline:hover{background:#f0f3fb}.button-primary{background:var(--blue);color:#fff}.button-primary:hover{background:#112db5}.button-primary:disabled{opacity:.55}main{max-width:1510px;margin:auto;padding:40px 5.5% 0}.title-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:1.7px;margin:0 0 11px;color:var(--blue)}h1,h2,h3{font-family:'Space Grotesk',sans-serif}h1{font-size:clamp(34px,3.3vw,50px);line-height:1.1;letter-spacing:-2px;margin:0 0 12px;font-weight:600}.title-dot{color:var(--blue)}.intro{font-size:16px;margin:0;color:var(--muted)}.lesson-meta{display:flex;gap:13px;align-items:center}.meta-icon{font-size:29px;color:#7785a1}.lesson-meta strong{display:block;font-size:14px}.lesson-meta div>span{display:block;font-size:13px;margin-top:5px;color:var(--muted)}.view-nav{display:flex;gap:32px;border-bottom:1px solid var(--line);margin-bottom:26px}.view-tab{background:none;padding:0 0 17px;color:var(--muted);font-size:15px;font-weight:600;border-bottom:3px solid transparent;margin-bottom:-1px}.view-tab span{font-size:12px;margin-right:8px;color:#94a0b3}.view-tab.active{border-bottom-color:var(--blue);color:var(--blue)}.view-tab.active span{color:var(--blue)}.lab-grid{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:25px}.stage{position:relative;border-radius:16px;overflow:hidden;background:#071122;height:440px;color:#fff;border:1px solid #202c43}.stage-top,.stage-bottom{position:absolute;left:24px;right:24px;display:flex;justify-content:space-between;z-index:2;gap:15px;align-items:center}.stage-top{top:20px}.stage-kicker{font-size:11px;color:#b6c4d9;font-weight:650;letter-spacing:1.6px}.stage-reset{font-size:13px;padding:7px 9px;color:#c6d5ee;background:#152239;border:1px solid #334361;border-radius:6px}.stage-bottom{bottom:20px;color:#a3b4ce;font-size:11px}.stage-bottom>span:last-child{font-size:10px;text-align:right}.canvas-label{position:absolute;pointer-events:none;font-size:11px;letter-spacing:1.5px;font-weight:650;color:#dce9ff;z-index:1}.label-sun{left:8%;top:45%;color:var(--yellow)}.label-sun>span{display:block;font-size:52px;line-height:1;font-weight:400}.label-earth{right:8%;top:31%}.label-earth>span{display:block;font-size:11px;color:#8ea6c7;letter-spacing:0;margin-top:7px;font-weight:400}#model-host{width:100%;height:100%;touch-action:none}#model-host canvas{display:block;width:100%;height:100%}.model-loader{position:absolute;inset:65px 20px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;color:#adc1df;padding:20px;z-index:3;background:#071122}.model-loader p{max-width:460px;font-size:15px;line-height:1.6}.loader-orbit{width:40px;height:40px;border:2px solid #344566;border-top-color:var(--yellow);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.model-controls{display:flex;align-items:center;gap:18px;border:1px solid var(--line);background:#fff;padding:15px 18px;border-radius:12px;margin-top:12px}.play-button{display:grid;place-items:center;border-radius:50%;width:39px;height:39px;background:var(--ink);color:#fff;font-size:18px;flex-shrink:0}.speed-control{display:flex;align-items:center;gap:12px;flex:1}.speed-control label{font-size:13px;color:var(--muted);white-space:nowrap}.speed-control input{width:110px;min-width:50px;accent-color:var(--blue);height:24px}.speed-control output{font-size:13px;font-weight:600;min-width:25px}.cycle-counter{border-left:1px solid var(--line);padding-left:20px;display:flex;gap:12px;align-items:center;font-size:13px;color:var(--muted)}.cycle-counter strong{color:var(--ink);font-variant-numeric:tabular-nums;min-width:35px}.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:20px}.mode-card{text-align:left;display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:10px;padding:17px 12px;background:#fff;position:relative;color:var(--ink)}.mode-card.active{border-color:var(--blue);background:#edf1ff}.mode-card:hover{border-color:#8d9cec}.mode-number{font-size:11px;color:#8390a4;align-self:flex-start;padding-top:3px}.mode-card.active .mode-number{color:var(--blue)}.mode-card strong{display:block;font-size:14px;font-weight:650}.mode-card div>span{font-size:11px;color:var(--muted);display:block;margin-top:5px}.mode-symbol{margin-left:auto;font-size:25px;color:#a2acc0}.mode-card.active .mode-symbol{color:var(--blue)}.lesson-panel{padding:26px 25px;background:#fff;border:1px solid var(--line);border-radius:14px;display:flex;flex-direction:column}.panel-tag{display:flex;align-items:center;gap:9px;color:var(--blue);font-size:10px;letter-spacing:1.2px;font-weight:700}.tiny-line{width:16px;height:2px;background:var(--blue)}.lesson-panel h2{font-size:28px;line-height:1.2;letter-spacing:-.7px;margin:20px 0 14px;font-weight:600}.lesson-panel>p{color:var(--muted);font-size:15px;line-height:1.7;margin:0}.fact-strip{display:flex;align-items:center;gap:13px;margin:24px 0;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.fact-strip>strong{font-family:'Space Grotesk',sans-serif;color:var(--blue);font-size:42px;line-height:1;font-weight:500;letter-spacing:-2px}.fact-strip div>span{font-size:13px;font-weight:600}.fact-strip p{font-size:12px;color:var(--muted);margin:5px 0 0}.observe-box{background:#fff8db;border:1px solid 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details:last-child{border-bottom:0}.practice-questions summary{cursor:pointer;font-size:16px;font-weight:600;line-height:1.5}.practice-questions p{font-size:15px;line-height:1.7;color:var(--muted)}.source-note{font-size:13px;line-height:1.7;color:var(--muted);max-width:960px;padding:26px 0 0}.source-note strong{color:var(--ink);font-size:14px}.quiz-layout{display:grid;grid-template-columns:320px 1fr;gap:50px;margin:40px 0;max-width:1080px}.quiz-intro h2{font-size:36px;line-height:1.15;letter-spacing:-1px;margin:0 0 17px}.quiz-intro>p:not(.eyebrow){font-size:16px;line-height:1.7;color:var(--muted)}.quiz-orbit{width:130px;height:130px;border:1px solid #c4cee8;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:48px;font-family:'Space Grotesk',sans-serif;color:var(--blue);margin:27px 0}.quiz-orbit span{font-size:10px;letter-spacing:1.5px;font-family:'DM Sans',sans-serif;margin-top:3px}.quiz-card{background:#fff;border:1px solid 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.button{background:#fff;color:#182332;font-size:13px;padding:10px 14px}.ar-status{position:absolute;left:50%;transform:translateX(-50%);bottom:105px;background:#071122dd;padding:12px 18px;border-radius:9px;z-index:5;font-size:14px;text-align:center;width:max-content;max-width:90%}.ar-controls{position:absolute;bottom:25px;left:50%;transform:translateX(-50%);display:flex;gap:6px;background:#071122dd;border:1px solid #35405a;padding:6px;border-radius:10px;z-index:5}.ar-controls button{font-size:13px;padding:12px 14px;border-radius:6px;white-space:nowrap;background:none;color:#fff}.ar-controls button.active{background:var(--blue)}#ar-play{border-left:1px solid #35405a}.ar-controls button:hover{background:#26324e}.ar-controls button.active:hover{background:var(--blue)}
@media(min-width:1400px){.stage{height:490px}.lab-grid{grid-template-columns:minmax(0,1fr) 360px}.lesson-panel{padding:30px}}
@media(max-width:1100px){.header{padding:0 4%;height:80px}main{padding:30px 4% 0}.lab-grid{grid-template-columns:minmax(0,1fr) 300px;gap:17px}.stage{height:405px}.lesson-panel{padding:22px}.lesson-panel h2{font-size:25px}.speed-control label{display:none}.mode-card{padding:15px 10px;gap:7px}.mode-card div>span{font-size:10px}.mode-symbol{display:none}.mode-card strong{font-size:13px}.cycle-counter{gap:7px;padding-left:12px}.stage-bottom{font-size:10px;left:17px;right:17px}.stage-bottom>span:last-child{max-width:110px}.notes-grid{gap:14px}.note-card{padding:22px}.quiz-layout{gap:30px;grid-template-columns:270px 1fr}}
@media(max-width:850px){.course-label{gap:8px;font-size:12px}.pill{padding:7px 9px;font-size:12px}.lab-grid{grid-template-columns:1fr}.stage{height:450px}.lesson-panel{display:grid;grid-template-columns:1fr 1fr;gap:0 25px;padding:26px}.panel-tag,.lesson-panel h2,.lesson-panel>p{grid-column:1}.lesson-panel h2{margin:15px 0 10px;font-size:28px}.fact-strip{grid-column:1;margin:18px 0}.observe-box{grid-column:2;grid-row:1 / span 4}.why-details{grid-column:2;margin:10px 0 16px}.next-button{grid-column:1;margin-top:0}.concept-progress{grid-column:1}.stage-bottom>span:last-child{max-width:none}.speed-control label{display:block}.mode-symbol{display:block}.mode-card strong{font-size:15px}.mode-card div>span{font-size:12px}.notes-grid{grid-template-columns:1fr}.note-card{padding:24px}.notes-heading h2{font-size:30px}.practice-section{grid-template-columns:1fr;gap:10px}.quiz-layout{grid-template-columns:1fr;margin:25px 0;gap:10px}.quiz-intro h2{font-size:30px}.quiz-orbit{display:none}.quiz-intro>.text-button{margin:0 0 15px}.quiz-intro>p:not(.eyebrow){margin:10px 0}.lesson-meta{display:none}}
@media(max-width:560px){.header{height:75px;padding:0 20px}.brand{font-size:28px;gap:9px}.brand-icon{width:38px;height:38px;font-size:28px}.brand-small{font-size:9px;letter-spacing:1.9px}.course-label{display:none}.header .button{font-size:13px;padding:10px 13px;min-height:40px}main{padding:27px 18px 0}.title-row{margin-bottom:25px}h1{font-size:36px;letter-spacing:-1.5px}.intro{font-size:14px}.view-nav{gap:0;justify-content:space-between;margin-bottom:20px}.view-tab{font-size:12px;padding-bottom:14px;max-width:32%;line-height:1.6;text-align:left}.view-tab span{display:block;font-size:10px;line-height:1;margin-bottom:7px}.stage{height:365px;border-radius:13px}.stage-top{left:15px;right:15px;top:15px}.stage-kicker{font-size:9px;letter-spacing:1.2px}.stage-reset{font-size:11px}.stage-bottom{left:15px;right:15px;bottom:14px;font-size:9px;align-items:flex-end}.stage-bottom>span:first-child{max-width:130px}.stage-bottom>span:last-child{font-size:9px;max-width:120px}.label-earth{right:5%;top:26%;font-size:9px}.label-earth>span{font-size:9px}.label-sun{left:5%;font-size:9px}.label-sun>span{font-size:36px}.model-controls{padding:12px;gap:12px}.play-button{width:35px;height:35px}.speed-control{gap:8px;flex-wrap:wrap}.speed-control label{font-size:11px;width:100%}.speed-control input{width:85px;height:16px}.speed-control output{font-size:11px}.cycle-counter{font-size:11px;flex-direction:column;gap:2px;padding-left:12px}.mode-grid{gap:7px;margin-top:14px}.mode-card{padding:12px 9px;display:block;min-height:88px}.mode-number{display:block;margin-bottom:7px;font-size:10px;padding:0}.mode-card strong{font-size:13px}.mode-card div>span{font-size:10px;line-height:1.3}.mode-symbol{display:none}.lesson-panel{display:flex;gap:0;padding:24px}.lesson-panel h2{font-size:28px}.fact-strip{margin:23px 0}.observe-box{margin:0}.why-details{margin:18px 0}.concept-progress{margin-top:16px}.takeaway{padding:17px;gap:12px;align-items:flex-start;flex-wrap:wrap}.takeaway>div{flex:1}.takeaway p{font-size:13px;line-height:1.6}.takeaway .text-button{margin-left:37px}.takeaway-icon{font-size:23px}footer{font-size:9px;line-height:1.5;align-items:flex-start;padding:20px 0;margin-top:25px}footer>span:first-child{max-width:180px}footer>span:last-child{text-align:right;max-width:120px}.quiz-card{padding:22px}.quiz-card h3{font-size:24px}.answer-option{font-size:14px;padding:13px}.answer-option.selected{padding:12px}.quiz-feedback{font-size:14px}.quiz-actions .button{padding:12px 15px;font-size:13px}.quiz-actions>span{font-size:12px}.practice-section{padding:22px}.practice-section h3{font-size:24px}.practice-questions summary{font-size:15px}.note-card h3{font-size:24px}.notes-heading h2{font-size:28px}dialog{padding:22px}dialog h2{font-size:26px}.ar-setup{grid-template-columns:1fr;gap:15px}.ar-setup img{max-width:260px;margin:auto}.ar-setup ol{font-size:14px}.ar-toolbar{left:14px;right:14px;top:14px}.ar-controls{bottom:22px;gap:2px;padding:5px}.ar-controls button{padding:12px 9px;font-size:12px}.ar-status{font-size:13px;bottom:92px}.ar-toolbar strong{font-size:14px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
.scanner-stage{position:relative;background:#071122;color:#fff;min-height:465px;border:1px solid #263551;border-radius:16px;overflow:hidden}.scan-idle{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:58px 24px 58px;min-height:465px}.scan-page-preview{position:relative;background:#fff;padding:8px;box-shadow:0 10px 40px #0006;border:1px solid #b7c6de;border-radius:4px;margin-bottom:22px}.scan-page-preview::before,.scan-page-preview::after{content:'';position:absolute;width:29px;height:29px;border-color:var(--yellow);border-style:solid;pointer-events:none}.scan-page-preview::before{top:-13px;left:-13px;border-width:2px 0 0 2px}.scan-page-preview::after{right:-13px;bottom:-13px;border-width:0 2px 2px 0}.scan-page-preview img{display:block;width:123px;height:auto}.scan-idle h2{font-size:25px;letter-spacing:-.6px;margin:0 0 8px}.scan-idle>p{font-size:14px;line-height:1.6;color:#a9bbd5;margin:0 0 20px;max-width:360px}.scan-idle>.button{padding:14px 21px;font-size:15px;background:var(--yellow);color:#152139}.scan-idle>.button:hover{background:#ffe188}.camera-badge{font-size:10px;padding:6px 9px;border:1px solid #364563;color:#bccbe0;border-radius:5px;letter-spacing:1px}.scan-test-note{display:flex;align-items:flex-start;gap:14px;border:1px solid #d6dfef;background:#eaf0fc;padding:17px 20px;border-radius:10px;margin-top:15px}.scan-test-note strong{background:#d8e1fb;color:#2946a4;white-space:nowrap;font-size:10px;letter-spacing:1px;padding:6px 7px;border-radius:4px;line-height:1.3}.scan-test-note p{font-size:14px;line-height:1.6;color:#485978;margin:0}.scan-panel{display:flex;padding:27px}.scan-panel h2{font-size:29px;margin-bottom:25px}.scan-steps{list-style:none;padding:0;margin:0 0 20px;display:flex;flex-direction:column;gap:23px}.scan-steps li{display:flex;gap:13px}.scan-steps li>span{flex-shrink:0;width:28px;height:28px;border-radius:50%;border:1px solid #c4cfee;background:#edf1ff;color:var(--blue);display:grid;place-items:center;font-size:12px;font-weight:600}.scan-steps strong{font-size:15px;font-weight:650}.scan-steps p{font-size:14px;line-height:1.65;color:var(--muted);margin:5px 0 0}.scan-panel .print-page-button{margin-top:auto;font-size:14px;text-decoration:none;color:var(--ink)}.scan-panel .print-hint{font-size:12px;line-height:1.6;color:var(--muted);margin:12px 0}.scan-panel>.text-button{font-size:12px;align-self:center;margin:0}.ar-test-banner{position:absolute;top:80px;left:50%;transform:translateX(-50%);background:#fbe9a9ef;color:#3d3114;padding:9px 15px;border:1px solid #c4a441;border-radius:7px;font-size:10px;letter-spacing:.8px;font-weight:650;max-width:92%;text-align:center;width:max-content;z-index:5}.ar-status{top:129px;bottom:auto;border:1px solid #5e6b82;font-size:13px;max-width:85%;background:#071122e6}.ar-lesson-card{position:absolute;left:50%;transform:translateX(-50%);bottom:91px;z-index:5;background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:13px;padding:17px 20px;width:min(580px,92%);box-shadow:0 8px 35px #0003;max-height:32dvh;overflow:auto}.ar-context-row{display:flex;justify-content:space-between;gap:12px;align-items:center}.ar-context-row>span{font-size:10px;font-weight:650;letter-spacing:1px;color:var(--blue)}.ar-context-row>.text-button{font-size:12px;min-height:22px}.ar-lesson-card h2{font-size:24px;line-height:1.2;letter-spacing:-.5px;margin:9px 0}.ar-lesson-card>p{font-size:14px;line-height:1.65;color:#526078;margin:0}.ar-card-actions{display:flex;gap:18px;align-items:center;justify-content:space-between;margin-top:12px}.ar-card-actions details{font-size:13px;line-height:1.6}.ar-card-actions summary{cursor:pointer;font-weight:600}.ar-card-actions details p{font-size:13px;color:var(--muted)}.ar-card-actions .button{font-size:12px;padding:10px 12px;min-height:37px;white-space:nowrap}.quiz-orbit b{font-weight:400}#ar-host .page-camera{position:absolute;inset:0;width:100%;height:100%;object-fit:contain}#ar-host .page-renderer,#ar-host .page-outline{position:absolute;inset:0;display:block;width:100%;height:100%;pointer-events:none}#ar-host .page-outline{z-index:2}
@media(max-width:850px){.scan-panel{display:flex}.scan-panel h2 br{display:none}.scan-panel h2{margin-bottom:20px}.scan-steps{flex-direction:row;gap:18px}.scan-steps li{flex:1}.scan-panel .print-page-button{align-self:flex-start}.scan-panel>.text-button{align-self:flex-start}.scan-panel .print-hint{margin:9px 0}.scan-grid{gap:20px}.scanner-stage,.scan-idle{min-height:470px}.view-nav{gap:20px}}
@media(max-width:560px){.view-nav{gap:8px}.view-tab{max-width:25%;font-size:12px}.scanner-stage,.scan-idle{min-height:470px}.scanner-stage .stage-kicker{max-width:160px;line-height:1.6}.scan-idle{padding:67px 20px 62px}.scan-idle h2{font-size:23px}.scan-idle>p{font-size:13px}.scan-idle>.button{font-size:14px}.scan-test-note{display:block;padding:15px}.scan-test-note strong{display:inline-block;margin-bottom:8px}.scan-test-note p{font-size:13px}.scan-steps{flex-direction:column;gap:20px}.scan-panel h2{font-size:27px}.scan-panel .print-page-button{align-self:stretch}.scan-panel>.text-button{align-self:center;margin-top:2px}.ar-test-banner{top:70px;font-size:9px;padding:9px 10px;line-height:1.5;max-width:90%;letter-spacing:.5px}.ar-status{top:123px;font-size:12px;padding:10px 12px;line-height:1.6}.ar-lesson-card{bottom:86px;padding:15px 17px;max-height:33dvh}.ar-lesson-card h2{font-size:22px}.ar-lesson-card>p{font-size:13px}.ar-context-row>span{font-size:9px;letter-spacing:.6px}.ar-context-row>.text-button{font-size:11px}.ar-card-actions{gap:14px;align-items:flex-start}.ar-card-actions details{font-size:12px;line-height:1.5}.ar-card-actions .button{padding:10px;font-size:11px}}
@media(max-width:560px){.scan-page-preview{display:none}.scanner-stage,.scan-idle{min-height:330px}}
.header-actions{display:flex;align-items:center;gap:10px}.view-nav{overflow-x:auto}.view-tab{white-space:nowrap;flex-shrink:0}.hand-start-icon{font-size:58px;line-height:1;display:block;margin-bottom:25px}.hand-screen{position:fixed;inset:0;z-index:30;background:#08101e;color:#fff;outline:none}.hand-screen:fullscreen{width:100%;height:100%}.hand-host{position:absolute;inset:0;overflow:hidden}.hand-camera{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transform:scaleX(-1)}.hand-earth-canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none}.hand-skeleton{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:2}.hand-shade{position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,#06142680,transparent 50%,#06142685),linear-gradient(0deg,#061426aa,transparent 36%,transparent 75%,#061426bb)}.hand-toolbar{position:absolute;z-index:5;left:28px;right:28px;top:24px;display:flex;justify-content:space-between;align-items:center;gap:20px}.hand-toolbar strong{font-family:'Space Grotesk',sans-serif;font-size:22px;letter-spacing:-.7px;text-shadow:0 2px 15px #000}.hand-toolbar>div>span{display:block;font-size:10px;letter-spacing:1.2px;color:#d3e0fa;margin-top:7px}.hand-toolbar-actions{display:flex;gap:9px}.hand-toolbar .button{background:#14253bdd;border:1px solid #8395b066;color:#fff;font-size:13px;min-height:42px;padding:11px 16px}.hand-toolbar .hand-close{background:#fff;color:var(--ink)}.hand-panel{position:absolute;right:28px;top:108px;bottom:28px;width:350px;padding:24px;background:#07172ae8;backdrop-filter:blur(13px);border:1px solid #657ea05c;border-radius:16px;z-index:5;overflow:auto;scrollbar-color:#6380a3 transparent}.hand-panel-kicker{font-size:10px!important;letter-spacing:1.3px;font-weight:650;color:#ffd45a!important;margin:0 0 18px!important}.hand-panel h2{font-size:32px;line-height:1.18;letter-spacing:-1px;margin:0 0 18px}.hand-panel>p{font-size:15px;line-height:1.65;color:#c2d2eb;margin:0 0 19px}.hand-fact{display:flex;align-items:center;gap:16px;padding:20px 0;margin-bottom:21px;border-top:1px solid #6484af50;border-bottom:1px solid #6484af50}.hand-fact strong{font-family:'Space Grotesk',sans-serif;font-size:49px;line-height:1;color:var(--yellow);letter-spacing:-2px}.hand-fact span{font-size:13px;line-height:1.6;color:#d9e4f7}.hand-gesture-guide{display:flex;flex-direction:column;gap:18px;margin:0 0 22px}.hand-gesture-guide b{display:block;font-size:14px;font-weight:600}.hand-gesture-guide span{display:block;font-size:13px;line-height:1.6;margin-top:5px;color:#a7bddc}.hand-big-button{width:100%;font-size:14px;min-height:48px;margin-top:10px}.hand-panel .button-primary{background:var(--yellow);color:#1b2638}.hand-panel .button-primary:hover{background:#ffe69b}.hand-panel .button-outline{background:transparent;color:#d3e0f4;border-color:#7c96ba77}.hand-panel .hand-small-note{font-size:11px;line-height:1.6;color:#a5b7d2;margin:15px 0 0}.hand-status-box{position:absolute;z-index:5;left:28px;bottom:28px;max-width:calc(100% - 470px);background:#091c30d9;border:1px solid #6380a35c;border-radius:11px;backdrop-filter:blur(8px);padding:15px 20px;pointer-events:none}.hand-live-tag{font-size:10px;letter-spacing:1.4px;color:#ffd45a;font-weight:650}.hand-status-box p{font-size:16px;line-height:1.5;margin:7px 0 0;color:#f5f8ff}.hand-speed-note{display:block;font-size:10px;margin-top:8px;line-height:1.6;color:#98b0ce}.hand-status-box>.text-button{color:#ffd45a;margin-top:8px;pointer-events:auto}.hand-cursor{position:absolute;z-index:20;pointer-events:none;transform:translate(-50%,-50%);width:46px;height:46px;border-radius:50%;background:conic-gradient(#ffd45a var(--progress,0deg),#ffffff36 0deg);box-shadow:0 0 18px #09152690;padding:4px}.hand-cursor>span{display:block;width:100%;height:100%;border-radius:50%;background:#0b203dcc;border:1px solid #d4e1f688}.hand-cursor>span::after{content:'';position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:9px;height:9px;border-radius:50%;background:#fff}.hand-cursor[data-gesture=pinch]{background:#8ff1d0}.hand-hover{outline:3px solid #ffd45a!important;outline-offset:2px;background-image:linear-gradient(90deg,#ffd45a30 var(--hold,0%),transparent var(--hold,0%))!important}.hand-question{font-size:25px!important;line-height:1.35!important;letter-spacing:-.5px!important}.hand-panel .hand-question-hint{font-size:12px;color:#a9bedb;margin-bottom:16px}.hand-answer-list{display:flex;flex-direction:column;gap:11px}.hand-answer{display:flex;gap:11px;align-items:center;min-height:61px;padding:13px;background:#18314de8;color:#fff;text-align:left;border:1px solid #718eaf66;border-radius:9px;font-size:14px;line-height:1.45}.hand-answer>span{display:grid;place-items:center;min-width:29px;height:29px;background:#91b2d324;border:1px solid #9fbde655;border-radius:5px;font-size:12px}.hand-answer b{font-weight:500}.hand-answer:hover:not(:disabled){border-color:#ffd45a}.hand-answer.correct{border-color:#8be9b6;background:#174436e8}.hand-answer.incorrect{border-color:#f8b986;background:#573823e8}.hand-feedback{margin-top:16px;padding:15px;background:#173c33;border:1px solid #71c3a066;border-radius:9px;font-size:14px;line-height:1.6}.hand-feedback.wrong{background:#473726;border-color:#be955966}.hand-feedback>p{font-size:13px;line-height:1.6;margin:7px 0 0;color:#e3e8ed}.hand-feedback>.button{font-size:13px;min-height:44px;margin-top:15px}.hand-score{font-family:'Space Grotesk',sans-serif;font-size:62px;letter-spacing:-3px;color:var(--yellow);margin:0 0 18px}.hand-score span{font-size:25px;letter-spacing:0;color:#9bb2cf}.hand-review{display:flex;flex-direction:column;gap:13px;margin-bottom:17px}.hand-review>p{margin:0;border-bottom:1px solid #758ba73b;padding-bottom:13px}.hand-review b{display:block;font-size:13px;color:#fff}.hand-review span{display:block;color:#b2c5df;font-size:12px;line-height:1.6;margin-top:5px}
@media(max-width:1100px){.hand-panel{right:22px;width:315px;padding:22px}.hand-toolbar{left:22px;right:22px}.hand-status-box{left:22px;max-width:calc(100% - 395px)}.hand-panel h2{font-size:29px}.hand-gesture-guide{gap:14px}.hand-gesture-guide span{font-size:12px}}
@media(max-width:850px){.hand-panel{top:auto;bottom:16px;left:16px;right:16px;width:auto;max-height:43dvh;padding:18px 22px}.hand-toolbar{top:17px;left:17px;right:17px}.hand-toolbar strong{font-size:18px}.hand-toolbar>div>span{font-size:9px;max-width:180px;line-height:1.5}.hand-status-box{top:90px;bottom:auto;left:17px;right:17px;max-width:none;padding:10px 13px}.hand-status-box p{font-size:13px;margin:5px 0 0}.hand-speed-note{display:none}.hand-live-tag{font-size:9px}.hand-panel h2{font-size:26px}.hand-panel h2 br{display:none}.hand-fact{display:none}.hand-gesture-guide{display:none}.hand-panel>p{font-size:14px;line-height:1.6;margin-bottom:10px}.hand-panel .hand-small-note{margin-top:10px}.hand-panel-kicker{margin-bottom:12px!important}.hand-question{font-size:22px!important}.hand-answer{min-height:51px;padding:11px;font-size:13px}.hand-answer-list{gap:9px}.hand-big-button{min-height:45px;font-size:13px}.hand-score{font-size:45px;margin-bottom:12px}.hand-review{gap:8px}.hand-review>p{padding-bottom:8px}}
@media(max-width:560px){#hand-open{display:none}.view-tab{max-width:none;font-size:12px}.view-nav{gap:19px}.hand-toolbar #hand-reset{display:none}.hand-toolbar strong{font-size:16px}.hand-toolbar>div>span{font-size:8px;max-width:145px}.hand-toolbar .button{font-size:11px;padding:9px 11px;min-height:37px}.hand-toolbar-actions{gap:6px}.hand-panel{left:12px;right:12px;bottom:12px;padding:17px;max-height:43dvh}.hand-status-box{left:12px;right:12px;top:84px}.hand-cursor{width:41px;height:41px}.hand-question{font-size:20px!important}.hand-status-box p{font-size:12px}.hand-start-icon{font-size:43px;margin-bottom:20px}}

/* Textbook library */
.view-nav{overflow-x:auto}.view-tab{white-space:nowrap}
.library-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:32px;align-items:start}
.library-sidebar{background:#eef1fa;border:1px solid #dbe1ef;border-radius:16px;padding:28px 20px;position:sticky;top:20px}
.library-sidebar h2{font-size:32px;line-height:1.12;margin:14px 0;font-family:'Space Grotesk',sans-serif;letter-spacing:-1px}
.library-book-note{font-size:13px;color:#607089;line-height:1.7;margin-bottom:28px}
.contents-chapter{padding:20px 0;border-top:1px solid #d6ddea}.contents-chapter>p{font-size:10px;letter-spacing:1.5px;font-weight:700;color:#526080;margin:0 0 8px}.contents-chapter h3{font-size:16px;margin:0 0 12px}
.section-link{display:flex;gap:10px;border:0;background:transparent;text-align:left;align-items:baseline;width:100%;padding:12px 10px;border-radius:8px;font:inherit;font-size:13px;line-height:1.5;color:#42536d;cursor:pointer}.section-link span{font-size:11px;font-weight:700;color:#7a87a1}.section-link:hover{background:#e0e6fa}.section-link.selected{background:#183ae2;color:white}.section-link.selected span{color:#cbd5ff}.library-side-note{font-size:12px;border-top:1px solid #d6ddea;padding-top:22px;color:#63738d;line-height:1.6}.library-side-note strong{color:#283b5c}
.library-reader{background:#fff;border:1px solid #e0e5ee;border-radius:16px;padding:38px 42px;min-width:0}.library-breadcrumb{font-size:12px;color:#718098;margin:0 0 32px}.library-reader>h2{font-family:'Space Grotesk',sans-serif;letter-spacing:-1px;font-size:34px;line-height:1.2;margin:12px 0 16px}.library-objective{border-left:3px solid #183ae2;padding:0 0 0 16px;font-size:14px;line-height:1.7;color:#465879;margin:0 0 24px}.library-prose p{font-size:16px;line-height:1.85;color:#42526b;margin:0 0 16px}.library-figure{margin:28px 0 24px}.library-model-stage{height:360px;border-radius:12px;background:#071122;position:relative;overflow:hidden}.library-stage-tag{position:absolute;top:18px;left:20px;color:#a9c0e7;font-size:10px;letter-spacing:1.6px;z-index:1;pointer-events:none}#library-model{width:100%;height:100%;touch-action:none}.library-model-message{position:absolute;top:40%;left:10%;right:10%;text-align:center;color:#c8d5ec;pointer-events:none}.library-model-message button{pointer-events:auto}.library-model-message p[hidden]{display:none}.library-figure figcaption{font-size:12px;color:#6f7d93;line-height:1.6;margin:12px 0}.library-figure-controls{display:flex;gap:16px;align-items:center;flex-wrap:wrap}.library-figure-controls>span{margin-left:auto;color:#8390a3;font-size:11px}.library-ar-actions{display:flex;align-items:center;gap:12px;border:1px solid #cdd8ff;border-radius:10px;background:#f0f4ff;padding:20px;margin:28px 0}.library-ar-actions>div{flex:1}.library-ar-actions strong{font-size:14px}.library-ar-actions p{font-size:12px;line-height:1.6;color:#62728e;margin:7px 0 0}.library-ar-actions .button{white-space:nowrap;font-size:12px;padding:12px 14px}.library-reading-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin:28px 0}.library-reading-grid h3{font-size:17px;margin:0 0 12px}.library-reading-grid ul{padding-left:20px;margin:0;color:#50617d;font-size:14px;line-height:1.9}.library-try{background:#fffae9;border-radius:10px;padding:20px}.library-try>p:last-child{font-size:14px;line-height:1.8;color:#685e3d;margin-bottom:0}.library-misconception{border-top:1px solid #e4e8f0;border-bottom:1px solid #e4e8f0;padding:20px 0;color:#354664;font-size:14px}.library-misconception summary{font-weight:600;cursor:pointer}.library-misconception p{line-height:1.8;color:#60718a}.library-check{padding:28px 0}.library-check h3{font-size:20px;margin:0 0 10px}.library-check p{color:#6f7d93;font-size:14px;line-height:1.6}.library-pagination{display:flex;justify-content:space-between;gap:12px;align-items:center;border-top:1px solid #e4e8f0;padding:24px 0}.library-pagination>span{font-size:11px;color:#8290a4}.library-pagination button:disabled{opacity:.35;cursor:default}.library-source{font-size:11px;line-height:1.8;color:#8995a7;margin-bottom:0}.library-source a{color:#6276a9}
@media(max-width:1100px){.library-layout{grid-template-columns:230px minmax(0,1fr);gap:20px}.library-reader{padding:28px}.library-ar-actions{flex-wrap:wrap}.library-ar-actions>div{flex-basis:100%}.library-figure-controls>span{margin-left:0}}
@media(max-width:750px){.library-layout{grid-template-columns:1fr;gap:16px}.library-sidebar{position:static;padding:20px}.library-sidebar h2 br{display:none}.library-sidebar h2{font-size:26px}.library-book-note{margin-bottom:12px}.contents-chapter{padding:12px 0}.section-link{padding:9px}.library-side-note{display:none}.library-reader{padding:24px 20px}.library-reader>h2{font-size:28px}.library-breadcrumb{margin-bottom:24px}.library-model-stage{height:280px}.library-reading-grid{grid-template-columns:1fr;gap:20px}.library-pagination{flex-wrap:wrap}.library-pagination>span{display:none}.library-figure-controls>span{width:100%}}

.library-book-label{display:block;font-size:11px;color:#64738b;margin-bottom:7px}.library-book-select{width:100%;border:1px solid #cbd4e7;background:white;border-radius:8px;padding:10px;font:inherit;font-size:13px;color:#304365;margin-bottom:5px}

.hand-view-controls{position:absolute;z-index:6;top:94px;left:28px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;max-width:calc(100% - 440px);padding:9px 12px;border:1px solid #6380a35c;border-radius:10px;background:#091c30eb;color:white}.hand-view-controls .button{background:#173451;color:white;border:1px solid #8aa4c466;min-width:46px;min-height:44px;font-size:16px;padding:9px 12px}.hand-view-controls button:disabled{opacity:.35}.hand-view-controls output{font-size:14px;min-width:46px;text-align:center}.hand-view-controls>span{font-size:12px;color:#bfd0e8;flex-basis:100%;line-height:1.6}.camera-hidden .hand-camera{opacity:0}.camera-hidden .hand-host{background:#071122}.camera-hidden .hand-shade{background:linear-gradient(0deg,#06142655,transparent 40%)}
@media(max-width:850px){.hand-view-controls{top:155px;left:17px;max-width:calc(100% - 34px);padding:6px 9px}.hand-view-controls .button{min-height:38px;font-size:14px;padding:7px 11px}.hand-view-controls>span{font-size:11px}}
@media(max-width:560px){.hand-view-controls{left:12px;max-width:calc(100% - 24px)}}

.mode-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.mode-card{min-width:0}.mode-card>div>strong{font-size:14px}.ar-controls{flex-wrap:wrap}@media(max-width:1000px){.mode-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}