.OpenLesson-module__Ue3lXG__lesson{--lesson-text:#19252a;--lesson-muted:#59696e;--lesson-red:#d6382c;color:var(--lesson-text);font-family:var(--font-onest), Arial, sans-serif;background:#fafbf9;padding:30px 28px 74px}.OpenLesson-module__Ue3lXG__container{max-width:1180px;margin:0 auto}.OpenLesson-module__Ue3lXG__breadcrumb{color:var(--lesson-muted);gap:12px;font-size:13px;display:flex}.OpenLesson-module__Ue3lXG__breadcrumb a:hover{color:var(--lesson-red)}.OpenLesson-module__Ue3lXG__hero{padding:74px 0 64px}.OpenLesson-module__Ue3lXG__eyebrow,.OpenLesson-module__Ue3lXG__sectionLabel{letter-spacing:.12em;color:#b92f24;font-size:11px;font-weight:600;line-height:1.5}.OpenLesson-module__Ue3lXG__eyebrow{align-items:center;gap:9px;display:flex}.OpenLesson-module__Ue3lXG__dot{background:var(--lesson-red);border-radius:50%;width:6px;height:6px}.OpenLesson-module__Ue3lXG__hero h1{letter-spacing:-.055em;margin:21px 0;font-size:clamp(40px,4.8vw,66px);font-weight:500;line-height:1.1}.OpenLesson-module__Ue3lXG__lead{max-width:680px;color:var(--lesson-muted);font-size:18px;line-height:1.65}.OpenLesson-module__Ue3lXG__lessonMeta{color:var(--lesson-muted);flex-wrap:wrap;gap:10px 23px;margin-top:25px;font-size:12px;display:flex}.OpenLesson-module__Ue3lXG__lessonMeta span{align-items:center;gap:8px;display:flex}.OpenLesson-module__Ue3lXG__lessonMeta span:before{content:"";background:#9baaab;border-radius:50%;width:4px;height:4px}.OpenLesson-module__Ue3lXG__lessonGrid{border-top:1px solid #dce3df;grid-template-columns:205px minmax(0,1fr);gap:65px;padding-top:46px;display:grid}.OpenLesson-module__Ue3lXG__outline{align-self:start;position:sticky;top:108px}.OpenLesson-module__Ue3lXG__outline>p{letter-spacing:.13em;color:var(--lesson-muted);margin:0 0 22px;font-size:10px}.OpenLesson-module__Ue3lXG__outline a{gap:14px;padding:12px 0;font-size:13px;display:flex}.OpenLesson-module__Ue3lXG__outline a span{color:#84918f;font-variant-numeric:tabular-nums;font-size:11px}.OpenLesson-module__Ue3lXG__outline a:hover{color:#b92f24}.OpenLesson-module__Ue3lXG__outcomeNote{color:var(--lesson-muted);border-top:1px solid #dce3df;margin-top:30px;padding-top:24px;font-size:12px;line-height:1.7}.OpenLesson-module__Ue3lXG__outcomeNote strong{color:var(--lesson-text);font-weight:500}.OpenLesson-module__Ue3lXG__content{min-width:0}.OpenLesson-module__Ue3lXG__section{padding-bottom:56px;scroll-margin-top:108px}.OpenLesson-module__Ue3lXG__section+.OpenLesson-module__Ue3lXG__section{border-top:1px solid #dce3df;padding-top:43px}.OpenLesson-module__Ue3lXG__section h2,.OpenLesson-module__Ue3lXG__finish h2{letter-spacing:-.035em;margin:13px 0 19px;font-size:clamp(26px,3vw,34px);font-weight:500;line-height:1.22}.OpenLesson-module__Ue3lXG__section>p,.OpenLesson-module__Ue3lXG__finish>p{color:var(--lesson-muted);font-size:15px;line-height:1.8}.OpenLesson-module__Ue3lXG__section p strong{color:var(--lesson-text);font-weight:500}.OpenLesson-module__Ue3lXG__exampleCard{background:#e9eeec;border:1px solid #e0e6e1;border-radius:16px;margin:27px 0 25px;padding:26px 30px}.OpenLesson-module__Ue3lXG__cardTop{color:#59696e;flex-wrap:wrap;justify-content:space-between;gap:8px;font-size:10px;display:flex}.OpenLesson-module__Ue3lXG__cardTop span:first-child{letter-spacing:.12em}.OpenLesson-module__Ue3lXG__equation{text-align:center;grid-template-columns:1fr 20px 1fr 20px 1fr 20px 1fr;align-items:start;gap:5px;padding:37px 0 32px;display:grid}.OpenLesson-module__Ue3lXG__equation>div{gap:8px;display:grid}.OpenLesson-module__Ue3lXG__equation strong{letter-spacing:-.06em;font-variant-numeric:tabular-nums;font-size:clamp(35px,4.3vw,56px);font-weight:500;line-height:1.1}.OpenLesson-module__Ue3lXG__equation div span{color:var(--lesson-muted);font-size:11px}.OpenLesson-module__Ue3lXG__operator{color:#899794;padding-top:12px;font-size:25px}.OpenLesson-module__Ue3lXG__equationResult strong{color:#b92f24}.OpenLesson-module__Ue3lXG__flowBar{border-radius:4px;gap:3px;height:8px;display:flex;overflow:hidden}.OpenLesson-module__Ue3lXG__flowBar span:first-child{background:#657f73;flex:7}.OpenLesson-module__Ue3lXG__flowBar span:nth-child(2){background:#c9d3cc;flex:1}.OpenLesson-module__Ue3lXG__flowBar span:last-child{background:#c9d3cc;flex:2}.OpenLesson-module__Ue3lXG__barLegend{color:var(--lesson-muted);flex-wrap:wrap;gap:10px 22px;margin-top:12px;font-size:10px;display:flex}.OpenLesson-module__Ue3lXG__barLegend span{align-items:center;gap:6px;display:flex}.OpenLesson-module__Ue3lXG__barLegend i{background:#657f73;border-radius:50%;width:5px;height:5px}.OpenLesson-module__Ue3lXG__barLegend span:last-child i{background:#aabbb0}.OpenLesson-module__Ue3lXG__assumption{align-items:flex-start;gap:12px;padding:20px 0 0;display:flex}.OpenLesson-module__Ue3lXG__assumption p{color:var(--lesson-muted);font-size:12px;line-height:1.8}.OpenLesson-module__Ue3lXG__noteMark{width:18px;height:18px;color:var(--lesson-muted);border:1px solid #aebcb5;border-radius:50%;flex-shrink:0;place-items:center;margin-top:2px;font-size:11px;display:grid}.OpenLesson-module__Ue3lXG__calculator{background:#fff;border:1px solid #dce3df;border-radius:16px;margin-top:27px;padding:27px}.OpenLesson-module__Ue3lXG__presets{flex-wrap:wrap;gap:9px;margin-bottom:25px;display:flex}.OpenLesson-module__Ue3lXG__presets button{color:var(--lesson-muted);font:inherit;cursor:pointer;background:#f1f4f1;border:1px solid #e4e9e5;border-radius:6px;padding:10px 12px;font-size:11px}.OpenLesson-module__Ue3lXG__presets button:hover{color:var(--lesson-text);border-color:#a8b9ae}.OpenLesson-module__Ue3lXG__inputs{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;display:grid}.OpenLesson-module__Ue3lXG__field label,.OpenLesson-module__Ue3lXG__practice>label{margin-bottom:9px;font-size:12px;font-weight:500;display:block}.OpenLesson-module__Ue3lXG__inputShell{background:#fafbf9;border:1px solid #c9d3cb;border-radius:7px;align-items:center;gap:8px;min-width:0;padding:0 12px;display:flex}.OpenLesson-module__Ue3lXG__inputShell:focus-within{outline-offset:2px;outline:2px solid #b92f24}.OpenLesson-module__Ue3lXG__inputShell input{width:100%;min-width:0;height:47px;color:var(--lesson-text);font:inherit;font-variant-numeric:tabular-nums;background:0 0;border:0;outline:0;font-size:18px}.OpenLesson-module__Ue3lXG__inputShell input[aria-invalid=true]{color:#b92f24}.OpenLesson-module__Ue3lXG__inputShell input::placeholder{color:#83938a;font-size:13px}.OpenLesson-module__Ue3lXG__inputShell>span{color:var(--lesson-muted);font-size:10px}.OpenLesson-module__Ue3lXG__field small{color:var(--lesson-muted);margin-top:8px;font-size:10px;line-height:1.6;display:block}.OpenLesson-module__Ue3lXG__inputHint{color:var(--lesson-muted);margin-top:16px;font-size:10px}.OpenLesson-module__Ue3lXG__calculatorResult{border-top:1px solid #dce3df;justify-content:space-between;align-items:center;gap:18px;margin-top:24px;padding-top:21px;display:flex}.OpenLesson-module__Ue3lXG__calculatorResult>div{flex-shrink:0}.OpenLesson-module__Ue3lXG__calculatorResult>div>span{font-size:12px;font-weight:500}.OpenLesson-module__Ue3lXG__calculatorResult p{color:var(--lesson-muted);margin-top:7px;font-size:10px}.OpenLesson-module__Ue3lXG__calculatorResult output{letter-spacing:-.04em;text-align:right;font-variant-numeric:tabular-nums;overflow-wrap:anywhere;font-size:35px;line-height:1.2}.OpenLesson-module__Ue3lXG__calculatorResult output small{letter-spacing:0;color:var(--lesson-muted);font-size:11px;font-weight:400}.OpenLesson-module__Ue3lXG__calculatorResult .OpenLesson-module__Ue3lXG__negative{color:#b92f24}.OpenLesson-module__Ue3lXG__resultExplanation{color:var(--lesson-muted);margin-top:15px;font-size:12px;line-height:1.75}.OpenLesson-module__Ue3lXG__practice{background:#e9eeec;border-radius:16px;margin-top:25px;padding:27px}.OpenLesson-module__Ue3lXG__practiceControls{grid-template-columns:minmax(0,1fr) auto;align-items:start;gap:12px;display:grid}.OpenLesson-module__Ue3lXG__primaryButton{color:#fff;min-height:49px;font:inherit;cursor:pointer;background:#b92f24;border:0;border-radius:7px;justify-content:center;align-items:center;gap:26px;padding:13px 20px;font-size:12px;font-weight:500;line-height:1.4;display:inline-flex}.OpenLesson-module__Ue3lXG__primaryButton:hover{background:#9f291f}.OpenLesson-module__Ue3lXG__primaryButton>span{font-size:19px;font-weight:400}.OpenLesson-module__Ue3lXG__feedback{min-height:43px;color:var(--lesson-muted);margin-top:17px;font-size:12px;line-height:1.75}.OpenLesson-module__Ue3lXG__correctFeedback{color:#365e46}.OpenLesson-module__Ue3lXG__finish{background:#f1f2ec;border:1px solid #e4e7dc;border-radius:16px;padding:35px}.OpenLesson-module__Ue3lXG__finish>p{max-width:560px}.OpenLesson-module__Ue3lXG__finish .OpenLesson-module__Ue3lXG__primaryButton{margin-top:24px}.OpenLesson-module__Ue3lXG__disclaimer{color:var(--lesson-muted);margin-top:25px;font-size:10px;line-height:1.8}.OpenLesson-module__Ue3lXG__lesson a:focus-visible,.OpenLesson-module__Ue3lXG__lesson button:focus-visible{outline-offset:5px;outline:2px solid #b92f24}@media (max-width:1000px){.OpenLesson-module__Ue3lXG__lessonGrid{grid-template-columns:160px minmax(0,1fr);gap:32px}.OpenLesson-module__Ue3lXG__inputs{grid-template-columns:1fr;gap:16px}.OpenLesson-module__Ue3lXG__field{grid-template-columns:1fr 160px;align-items:center;column-gap:20px;display:grid}.OpenLesson-module__Ue3lXG__field label{margin:0}.OpenLesson-module__Ue3lXG__field small{margin:4px 0 0}.OpenLesson-module__Ue3lXG__field .OpenLesson-module__Ue3lXG__inputShell{grid-area:1/2/3}}@media (max-width:720px){.OpenLesson-module__Ue3lXG__lesson{padding:24px 20px 50px}.OpenLesson-module__Ue3lXG__hero{padding:46px 0 37px}.OpenLesson-module__Ue3lXG__hero h1{font-size:clamp(34px,7vw,48px)}.OpenLesson-module__Ue3lXG__lead{font-size:15px}.OpenLesson-module__Ue3lXG__lessonMeta{gap:10px 14px;font-size:10px}.OpenLesson-module__Ue3lXG__lessonGrid{padding-top:0;display:block}.OpenLesson-module__Ue3lXG__outline{flex-wrap:wrap;gap:4px 19px;padding:13px 0 25px;display:flex;position:static}.OpenLesson-module__Ue3lXG__outline>p,.OpenLesson-module__Ue3lXG__outcomeNote{display:none}.OpenLesson-module__Ue3lXG__outline a{gap:7px;font-size:11px}.OpenLesson-module__Ue3lXG__section{padding-bottom:37px;scroll-margin-top:100px}.OpenLesson-module__Ue3lXG__section+.OpenLesson-module__Ue3lXG__section{padding-top:32px}.OpenLesson-module__Ue3lXG__section h2{font-size:26px}.OpenLesson-module__Ue3lXG__section>p,.OpenLesson-module__Ue3lXG__finish>p{font-size:14px}.OpenLesson-module__Ue3lXG__exampleCard{border-radius:12px;padding:22px 18px}.OpenLesson-module__Ue3lXG__equation{grid-template-columns:1fr 12px 1fr 12px 1fr 12px 1fr;gap:1px;padding:28px 0}.OpenLesson-module__Ue3lXG__equation strong{font-size:40px}.OpenLesson-module__Ue3lXG__equation div span{font-size:9px}.OpenLesson-module__Ue3lXG__operator{padding-top:8px;font-size:20px}.OpenLesson-module__Ue3lXG__calculator,.OpenLesson-module__Ue3lXG__practice{border-radius:12px;padding:22px 18px}.OpenLesson-module__Ue3lXG__field{grid-template-columns:1fr 133px;column-gap:10px}.OpenLesson-module__Ue3lXG__field label{font-size:11px}.OpenLesson-module__Ue3lXG__calculatorResult{align-items:flex-start;gap:15px}.OpenLesson-module__Ue3lXG__calculatorResult>div{flex-shrink:1}.OpenLesson-module__Ue3lXG__calculatorResult>div>span{font-size:11px}.OpenLesson-module__Ue3lXG__calculatorResult output{font-size:29px}.OpenLesson-module__Ue3lXG__practiceControls{grid-template-columns:1fr}.OpenLesson-module__Ue3lXG__practiceControls .OpenLesson-module__Ue3lXG__primaryButton{justify-content:space-between;width:100%}.OpenLesson-module__Ue3lXG__finish{border-radius:12px;padding:27px 22px}}@media (prefers-reduced-motion:reduce){.OpenLesson-module__Ue3lXG__lesson{scroll-behavior:auto}}