@font-face{font-family:display;src:url(../media/newsreader_latin_standard_normal-s.p.1pv2gabaqveyu.woff2)format("woff2");font-display:swap;font-weight:200 800;font-style:normal}@font-face{font-family:display;src:url(../media/newsreader_latin_standard_italic-s.p.15gv-gmajdxy8.woff2)format("woff2");font-display:swap;font-weight:200 800;font-style:italic}@font-face{font-family:display Fallback;src:local(Arial);ascent-override:80.52%;descent-override:29.03%;line-gap-override:0.0%;size-adjust:91.28%}.wlW-NW_className{font-family:display,display Fallback}.wlW-NW_variable{--font-display:"display", "display Fallback"}
@font-face{font-family:sans;src:url(../media/dm_sans_latin_wght_normal-s.p.0fpdy-lufm69d.woff2)format("woff2");font-display:swap;font-weight:100 1000}@font-face{font-family:sans Fallback;src:local(Arial);ascent-override:94.36%;descent-override:29.49%;line-gap-override:0.0%;size-adjust:105.13%}.XPKTYa_className{font-family:sans,sans Fallback}.XPKTYa_variable{--font-sans:"sans", "sans Fallback"}
:root{--paper:#fafbf7;--ink:#193d30;--jade:#32644e;--sage:#e8eedf;--lime:#d5eb9c;--white:#fff;--muted:#526558;--line:#193d3026}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:40px}body{background:var(--paper);color:var(--ink);font-family:var(--font-sans), sans-serif;-webkit-font-smoothing:antialiased;margin:0}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent;touch-action:manipulation}button{color:inherit;cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,[tabindex="-1"]:focus-visible{outline:2px solid var(--jade);outline-offset:6px}::selection{background:var(--lime);color:var(--ink)}h1,h2,h3,p{margin:0}.shell{width:min(1380px,100%);margin-inline:auto;padding-inline:64px}.site-header{justify-content:space-between;align-items:center;height:108px;display:flex;position:relative}.site-header:after{content:"";background:var(--line);height:1px;position:absolute;bottom:0;left:64px;right:64px}.wordmark{letter-spacing:-2.7px;padding-bottom:8px;font-size:43px;font-weight:680;line-height:1}.header-actions{align-items:center;gap:32px;display:flex}.request-demo{border:1px solid var(--ink);background:var(--ink);min-height:46px;color:var(--white);white-space:nowrap;border-radius:30px;justify-content:center;align-items:center;gap:22px;padding:11px 20px;font-size:14px;font-weight:500;transition:background .18s,color .18s;display:inline-flex}.request-demo:hover{background:var(--jade)}.request-demo svg{width:17px;height:17px}.header-link{align-items:center;gap:20px;min-height:44px;font-size:15px;display:inline-flex}.header-link:hover{text-underline-offset:6px;text-decoration:underline}.hero{padding-top:48px}.hero-copy{justify-content:space-between;align-items:flex-end;gap:50px;padding-bottom:50px;display:flex}h1{letter-spacing:-.066em;font-size:clamp(80px,8.8vw,110px);font-weight:500;line-height:.98}h1>span{font-family:var(--font-display), Georgia, serif;letter-spacing:-.06em;white-space:nowrap;padding-right:20px;font-style:italic;font-weight:430;position:relative}h1 svg{width:96%;height:24px;position:absolute;bottom:-12px;left:0;overflow:visible}h1 svg path{stroke:var(--jade);stroke-width:2.3px;stroke-linecap:round}.hero-intro{padding-bottom:6px;padding-right:38px}.eyebrow{color:var(--muted);margin-bottom:18px;font-size:12px;display:block}.hero-intro>p{letter-spacing:-.75px;font-size:25px;line-height:1.4}.text-link{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:45px;min-height:44px;margin-top:25px;font-size:14px;display:inline-flex}.text-link:hover{border-color:var(--ink)}.hero-afterword,.teacher-afterword{color:var(--muted);justify-content:space-between;align-items:center;gap:25px;margin-top:22px;font-size:14px;display:flex}.section-index{letter-spacing:1.1px;font-size:10px}.chapter-label{align-items:center;gap:12px;margin-bottom:29px;font-size:13px;display:flex}.chapter-tick{background:currentColor;width:23px;height:1px}h2{letter-spacing:-.055em;font-size:clamp(43px,4.6vw,63px);font-weight:480;line-height:1.09}h2 em{font-family:var(--font-display), Georgia, serif;letter-spacing:-.035em;font-weight:420}.chapter-copy p{color:var(--muted);margin-top:27px;font-size:17px;line-height:1.65}.example-section{grid-template-columns:.95fr 1.05fr;align-items:center;gap:85px;padding-block:150px 160px;display:grid}.teacher-section{background:var(--ink);color:var(--paper);padding-block:85px 52px}.teacher-heading{justify-content:space-between;align-items:flex-end;gap:40px;margin-bottom:55px;display:flex}.teacher-heading .chapter-label{color:#bdcdbb}.teacher-heading h2{font-size:clamp(52px,5.4vw,76px)}.teacher-heading-copy{padding-right:40px}.teacher-heading-copy>p{color:#dee7d8;letter-spacing:-.45px;font-size:23px;line-height:1.45}.teacher-demo-link{border-color:var(--lime);background:var(--lime);color:var(--ink);margin-top:25px}.teacher-demo-link:hover{background:var(--white);color:var(--ink)}.teacher-demo-link:focus-visible{outline-color:var(--lime)}.teacher-afterword{color:#bfcebb;margin-top:27px;font-size:13px}.site-footer{color:var(--muted);justify-content:space-between;align-items:flex-end;gap:25px;padding-block:56px 46px;font-size:13px;display:flex}.site-footer p{margin-top:15px}.site-footer .wordmark{color:var(--ink);letter-spacing:-6.5px;font-size:88px}.skip-link{z-index:20;background:var(--ink);color:var(--white);clip-path:inset(50%);width:1px;height:1px;padding:12px 18px;position:fixed;top:10px;left:10px;overflow:hidden}.skip-link:focus{clip-path:none;width:auto;height:auto}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition:none!important;animation:none!important}}
.demo{isolation:isolate;background-color:var(--sage);background-image:linear-gradient(#193d3005 1px,#0000 1px),linear-gradient(90deg,#193d3005 1px,#0000 1px);background-size:32px 32px;border:1px solid #193d3014;border-radius:4px;padding:24px 35px 31px;scroll-margin-top:30px;position:relative}.desk-heading{color:#526558;letter-spacing:1.4px;justify-content:space-between;font-size:10px;display:flex}.teaching-canvas{max-width:1100px;height:480px;margin:-5px auto -12px;position:relative}.teaching-canvas canvas{opacity:0;width:100%;height:100%;position:absolute;inset:0}.scene-ready canvas{opacity:1}.worksheet-accessible{place-items:center;display:grid;position:absolute;inset:0}.scene-ready .worksheet-accessible{clip-path:inset(50%);width:1px;height:1px;margin:-1px;overflow:hidden}.paper-fallback{background:var(--white);border:1px solid #cbd6c4;border-radius:8px;width:83%;transition:transform .7s;position:relative;overflow:hidden;transform:rotate(-3deg);box-shadow:7px 10px 0 -2px #c5d4bb,-7px 17px 0 -3px #f7f8f0,0 35px 40px -24px #193d3040}.paper-has-hint{transform:rotate(-1deg)}.paper-browser{border-bottom:1px solid var(--line);background:var(--paper);height:39px;color:var(--muted);justify-content:space-between;align-items:center;padding-inline:18px;font-size:12px;display:flex}.browser-dots{letter-spacing:3px;font-size:27px;line-height:.5}.paper-content{padding:30px 48px}.paper-question{font-size:22px}.equation{font-family:var(--font-display), Georgia, serif;letter-spacing:1px;text-align:center;margin:35px 0 42px;font-size:76px}.equation-focus{background:var(--lime);border-radius:5px;padding:1px 5px;position:relative;box-shadow:0 4px #abc173}.equation-focus:after{content:"";background:var(--jade);border-radius:50%;height:2px;position:absolute;bottom:-10px;left:-3px;right:-3px;transform:rotate(-2deg)}.working-lines{border-top:1px solid var(--line);height:20px;margin-bottom:16px}.answer-line{font-size:24px;font-family:var(--font-display), Georgia, serif;align-items:center;gap:12px;display:flex}.blank-answer{border-bottom:1px solid var(--line);width:59px;height:25px}.student-working{margin-top:-17px;margin-bottom:15px;font-size:18px}.student-working span{color:var(--muted);margin-left:15px;font-size:12px}.demo-conversation{z-index:1;background:var(--paper);border:1px solid #193d3018;border-radius:5px;align-items:center;gap:25px;min-height:114px;padding:22px 26px;display:flex;position:relative;box-shadow:0 5px 0 -2px #193d3010}.jade-presence{border-right:1px solid var(--line);align-self:center;justify-items:center;gap:12px;padding-right:23px;display:grid}.jade-presence>span:first-child{letter-spacing:-1.8px;font-size:29px;font-weight:650;line-height:1}.presence-line{background:#99ac92;border-radius:4px;width:24px;height:3px;transition:width .3s;display:block}.presence-line.is-helping{background:var(--jade);width:39px}.lesson-copy{flex:1}.lesson-prompt{letter-spacing:-.55px;font-size:20px;font-weight:500;line-height:1.35}.lesson-prompt:focus{outline:none}.lesson-prompt:focus-visible{outline:2px solid var(--jade);outline-offset:6px}.lesson-response{color:var(--muted);margin-top:8px;font-size:13px;line-height:1.5}.ask-button{background:var(--lime);border:1px solid #adc77c;border-radius:40px;flex-shrink:0;justify-content:space-between;align-items:center;gap:33px;min-height:54px;padding:14px 23px;font-size:15px;font-weight:550;transition:background .18s,transform .18s,box-shadow .18s;display:inline-flex;box-shadow:0 3px #b6cc8b}.ask-button:hover{background:#c8e581;transform:translateY(-2px);box-shadow:0 5px #b6cc8b}.ask-button:active{box-shadow:none;transform:translateY(2px)}.another-way-link{width:fit-content;min-height:44px;color:var(--muted);align-items:center;gap:16px;margin:12px 0 -12px auto;font-size:12px;display:flex}.another-way-link:hover{text-underline-offset:4px;text-decoration:underline}.another-way-link svg{width:15px}.step-choices{gap:8px;display:flex}.step-choices button{background:#fff;border:1px solid #becbb5;border-radius:5px;justify-items:center;gap:5px;min-width:82px;min-height:68px;padding:9px 12px;transition:background .18s,border-color .18s;display:grid}@media (hover:hover) and (pointer:fine){.step-choices button:hover{background:var(--paper);border-color:var(--jade)}}.step-choices button>span:first-child{font:28px var(--font-display), Georgia, serif}.step-choices button>span:last-child{font-size:10px}.step-choices .choice-reconsider{background:var(--sage);border-style:dashed}.lesson-done{color:var(--jade);align-items:center;gap:12px;font-size:12px;line-height:1.5;display:flex}.lesson-done svg{fill:none;stroke:currentColor;stroke-width:1.5px;border:1px solid #8aa475;border-radius:50%;width:33px;height:33px;padding:6px}.worked-example{background:#fff;border:1px solid #c5cebd;border-radius:4px;padding:25px 32px 12px;position:relative;transform:rotate(2deg);box-shadow:0 23px 40px -32px #193d3070}.worked-example:before{content:"";z-index:-2;background:var(--sage);border:1px solid #c5cebd;border-radius:4px;position:absolute;inset:10px 9px -10px -9px;transform:rotate(-4deg)}.board-heading{border-bottom:1px solid var(--line);color:var(--muted);justify-content:space-between;align-items:center;padding-bottom:19px;font-size:12px;display:flex}.mini-wordmark{letter-spacing:-1.5px;color:var(--ink);font-size:24px;font-weight:650}.example-main-equation{font:45px var(--font-display), Georgia, serif;margin-top:30px}.example-math{background:repeating-linear-gradient(#0000 0 96px,#193d3010 96px 97px);min-height:195px;margin:0;padding:0;list-style:none}.example-math li{justify-content:space-between;align-items:center;gap:15px;min-height:97px;animation:.4s both equation-arrive;display:flex}.example-math li>span:first-child{font:41px var(--font-display), Georgia, serif;white-space:nowrap}.example-math .example-operation{width:116px;color:var(--muted);font-size:13px;line-height:1.5;position:relative}.operation-mark{font:italic 25px var(--font-display), Georgia, serif;color:var(--jade);position:absolute;top:3px;left:-42px;transform:rotate(-8deg)}.example-answer{place-items:center;width:48px;height:46px;display:inline-grid;position:relative}.example-answer:before{content:"";border:1.5px solid var(--jade);border-radius:50%;position:absolute;inset:0;transform:rotate(-15deg)}.example-next{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;margin-top:18px;padding-block:10px 0;display:flex}.example-progress{gap:6px;display:flex}.example-progress>span{background:#cdd6c5;border-radius:50%;width:5px;height:5px}.example-progress>.is-complete{background:var(--jade)}.example-next button{background:0 0;border:none;justify-content:space-between;align-items:center;gap:17px;min-height:48px;padding:6px 0 6px 10px;font-size:13px;display:flex}.example-next button:hover{text-underline-offset:5px;text-decoration:underline}@keyframes equation-arrive{0%{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}.worked-example:after{content:"";z-index:-1;background:#fff;border-radius:4px;position:absolute;inset:0}
.classroom-preview{color:var(--ink);background:var(--white);border:1px solid #193d3022;border-radius:5px;overflow:hidden;box-shadow:0 20px 45px -35px #193d3055}.classroom-topbar{border-bottom:1px solid var(--line);align-items:center;gap:32px;padding:20px 28px;font-size:13px;display:flex}.preview-label{background:var(--sage);color:var(--muted);border-radius:3px;margin-left:auto;padding:6px 10px;font-size:11px}.classroom-body{grid-template-columns:.9fr 1.1fr;display:grid}.classroom-roster{background:var(--paper);border-right:1px solid var(--line);padding:36px 28px}.classroom-heading>span{color:var(--muted);font-size:12px}.classroom-heading h3{letter-spacing:-1px;margin-top:5px;font-size:26px;font-weight:500}.roster-label{color:var(--muted);margin:32px 0 12px;font-size:12px}.preview-students{gap:8px;display:grid}.preview-student{text-align:left;background:0 0;border:1px solid #0000;border-radius:5px;align-items:flex-start;gap:14px;width:100%;padding:18px;transition:background .18s;display:flex}.preview-student:hover{background:var(--sage)}.preview-student[aria-pressed=true]{background:var(--white);box-shadow:-3px 0 0 var(--jade);border-color:#b9c9ae}.student-avatar{background:var(--sage);border-radius:50%;flex-shrink:0;place-items:center;width:34px;height:34px;font-size:13px;display:grid}.student-summary{gap:6px;display:grid}.student-summary strong{font-size:15px;font-weight:550}.student-summary>span{color:var(--muted);font-size:12px}.student-summary .student-feedback{margin-top:6px;font-size:11px}.student-summary .needs-hand{color:var(--ink);text-underline-offset:3px;text-decoration:underline}.preview-student>svg{opacity:0;width:17px;margin-top:8px;margin-left:auto}.preview-student[aria-pressed=true]>svg{opacity:1}.student-detail{padding:36px 38px}.detail-heading{justify-content:space-between;align-items:center;gap:16px;margin-bottom:37px;display:flex}.detail-heading h3{font-size:15px;font-weight:500}.detail-heading>span{color:var(--muted);font-size:11px}.detail-task{color:var(--muted);font-size:13px}.detail-equation{font:42px var(--font-display), Georgia, serif;margin-top:18px}.teacher-hint{border-left:2px solid var(--jade);background:var(--sage);margin-top:32px;padding:21px 24px}.teacher-hint>span{color:var(--muted);font-size:11px}.teacher-hint>p{letter-spacing:-.3px;min-height:56px;margin-top:8px;font-size:19px;line-height:1.45}.detail-feedback{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;align-items:center;gap:12px;margin-top:28px;padding-top:19px;font-size:11px;display:flex}.detail-feedback strong{color:var(--ink);font-weight:500}
@media (max-width:1100px){.shell{padding-inline:40px}.site-header:after{left:40px;right:40px}.hero-intro{padding-right:0}.hero-intro>p{font-size:22px}.teaching-canvas{height:465px}.demo{padding-inline:25px}.demo-conversation{gap:20px;padding-inline:22px}.lesson-prompt{font-size:18px}.jade-presence{padding-right:18px}.lesson-done{max-width:145px}.example-section{gap:55px;padding-block:120px 130px}.worked-example{padding-inline:25px}.example-main-equation{font-size:41px}.example-math li>span:first-child{font-size:36px}.example-math .example-operation{width:102px;font-size:12px}.student-detail{padding-inline:27px}.classroom-roster{padding-inline:22px}}@media (max-width:800px){.site-header{height:88px}.wordmark{font-size:38px}.hero{padding-top:45px}.hero-copy{gap:30px;padding-bottom:45px}h1{font-size:83px}.hero-intro>p{font-size:18px}.eyebrow{max-width:160px;font-size:10px;line-height:1.5}.text-link{margin-top:15px}.demo{padding-inline:20px}.desk-heading{font-size:8px}.teaching-canvas{height:370px;margin-inline:-18px}.demo-conversation{flex-wrap:wrap;gap:15px;padding:21px}.jade-presence{display:none}.lesson-copy{flex-basis:55%}.lesson-prompt{font-size:18px}.lesson-response{font-size:12px}.step-choices{margin-left:auto}.step-choices button{min-width:77px}.hero-afterword{font-size:12px}.section-index{letter-spacing:.6px;font-size:8px}.example-section{grid-template-columns:1fr;gap:45px;padding-block:90px 105px}.chapter-copy{max-width:450px}.worked-example{justify-self:center;width:min(500px,100% - 20px);padding-inline:30px}.example-main-equation{font-size:47px}.example-math li>span:first-child{font-size:42px}.example-math .example-operation{width:123px;font-size:14px}.teacher-section{padding-block:60px 40px}.teacher-heading{align-items:flex-end;gap:25px;margin-bottom:35px}.teacher-heading h2{font-size:53px}.teacher-heading-copy{padding-right:0}.teacher-heading-copy>p{font-size:18px}.teacher-demo-link{padding-inline:16px;font-size:13px}.classroom-body{display:block}.classroom-roster{border-right:0;border-bottom:1px solid var(--line);padding:25px 22px}.classroom-heading h3{font-size:23px}.roster-label{margin-top:20px}.preview-students{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.preview-student{gap:10px;padding:15px 12px}.preview-student>svg{display:none}.student-avatar{width:27px;height:27px;font-size:11px}.student-detail{padding:28px}.detail-heading{margin-bottom:24px}.teacher-hint>p{min-height:0}.teacher-afterword{align-items:flex-start;line-height:1.6}.teacher-afterword>span:first-child{max-width:280px}.teacher-afterword .section-index{white-space:nowrap}.site-footer .wordmark{letter-spacing:-5px;font-size:70px}}@media (max-width:580px){html{scroll-padding-top:25px}.shell{padding-inline:24px}.site-header{height:82px}.site-header:after{left:24px;right:24px}.teacher-nav-link{display:none}.header-actions{gap:0}.request-demo{gap:14px;min-height:44px;padding:10px 16px;font-size:13px}.wordmark{font-size:36px}.hero{padding-top:36px}.hero-copy{padding-bottom:31px;display:block}h1{font-size:clamp(70px,18vw,97px);line-height:.97}h1 svg{height:17px;bottom:-10px}.hero-intro{margin-top:32px}.eyebrow{max-width:none;margin-bottom:9px;font-size:11px}.hero-intro>p{letter-spacing:-.35px;font-size:18px;line-height:1.5}.hero-intro>p br{display:none}.text-link{min-height:44px;margin-top:11px;font-size:13px}.demo{margin-inline:-12px;padding:17px 16px 21px}.desk-heading{letter-spacing:.7px;font-size:7px}.teaching-canvas{height:260px;margin:2px -20px -6px}.demo-conversation{gap:18px;min-height:154px;padding:20px 17px;display:flex}.lesson-copy{flex-basis:100%}.lesson-prompt{letter-spacing:-.6px;font-size:19px}.lesson-response{margin-top:7px;font-size:13px}.ask-button{gap:33px;min-height:46px;margin-left:auto;padding:10px 18px;font-size:14px}.ask-button svg{width:18px}.another-way-link{gap:8px;margin-top:9px;margin-bottom:-10px;font-size:12px}.step-choices{justify-content:space-between;gap:8px;width:100%}.step-choices button{flex:1;min-width:0;padding:10px 5px}.step-choices button>span:last-child{font-size:11px}.lesson-done{max-width:none}.lesson-done br{display:none}.hero-afterword{margin-top:18px;font-size:12px}.section-index{display:none}.paper-fallback{width:85%}.paper-browser{height:25px;padding-inline:10px;font-size:9px}.browser-dots{font-size:20px}.paper-content{padding:18px 20px}.paper-question{font-size:13px}.equation{margin-block:23px 29px;font-size:37px}.working-lines{height:8px;margin-bottom:7px}.answer-line{font-size:16px}.blank-answer{width:40px;height:15px}.student-working{margin-top:-13px;margin-bottom:9px;font-size:12px}.student-working span{margin-left:8px;font-size:10px}.example-section{gap:35px;padding-block:85px 95px}.chapter-label{margin-bottom:22px;font-size:12px}h2{font-size:43px}.chapter-copy p{margin-top:19px;font-size:16px}.worked-example{width:calc(100% - 12px);padding:20px 21px 10px}.board-heading{padding-bottom:16px;font-size:10px}.mini-wordmark{font-size:22px}.example-main-equation{margin-top:26px;font-size:39px}.example-math{min-height:198px}.example-math li{min-height:98px}.example-math li>span:first-child{font-size:35px}.example-math .example-operation{width:91px;font-size:14px}.operation-mark{font-size:21px;left:-30px}.example-answer{width:43px;height:42px}.example-next button{gap:10px;font-size:12px}.teacher-section{padding-block:54px 32px}.teacher-heading{display:block}.teacher-heading h2{font-size:54px}.teacher-heading-copy{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:15px;margin-top:28px;display:flex}.teacher-heading-copy>p{font-size:17px}.teacher-demo-link{margin-top:3px}.classroom-preview{margin-inline:-8px}.classroom-topbar{gap:15px;padding:17px 16px;font-size:11px}.preview-label{font-size:9px}.classroom-roster{padding:23px 16px 19px}.classroom-heading h3{font-size:23px}.student-avatar{display:none}.student-summary strong{font-size:16px}.student-summary>span{font-size:14px;line-height:1.45}.student-summary .student-feedback{font-size:12px}.student-detail{padding:26px 22px}.detail-heading{gap:8px}.detail-heading h3{font-size:14px}.detail-heading>span{font-size:10px}.detail-equation{font-size:37px}.detail-task{font-size:14px}.detail-feedback{font-size:12px}.detail-feedback strong{font-size:13px}.teacher-hint{margin-top:25px;padding:19px}.teacher-hint>p{font-size:18px}.teacher-afterword{font-size:12px}.teacher-afterword>span:first-child{max-width:270px}.site-footer{flex-wrap:wrap;row-gap:17px;padding-block:35px 25px;font-size:12px}.site-footer .wordmark{letter-spacing:-5.5px;font-size:78px}}@media (max-width:359px){.shell{padding-inline:20px}.site-header:after{left:20px;right:20px}.teaching-canvas{height:224px}.demo{padding-inline:12px}.demo-conversation{padding-inline:14px}.lesson-prompt{font-size:18px}.paper-content{padding:15px 18px}.equation{font-size:31px}.worked-example{padding-inline:18px}.example-main-equation{font-size:33px}.example-math li>span:first-child{font-size:30px}.example-math .example-operation{width:85px}.operation-mark{font-size:19px;left:-25px}h2{font-size:38px}.teacher-heading h2{font-size:49px}}