.ArticleVisual_figure__MnkaY{--visual-blue:var(--brand-primary,#2563ff);--visual-blue-strong:var(--brand-primary-strong,#1746c8);--visual-blue-soft:var(--brand-primary-soft,#eaf3ff);--visual-gold:var(--brand-highlight,#ffc629);--visual-surface:var(--brand-surface,#fff);--visual-canvas:var(--brand-canvas,#f7faff);--visual-ink:var(--brand-ink,#0f1f4d);--visual-muted:var(--brand-muted,#53658e);--visual-border:var(--brand-border,#d6e3f6);overflow:hidden;margin:28px 0;border:1px solid color-mix(in srgb,var(--visual-blue) 22%,var(--visual-border));border-radius:22px;background:var(--visual-surface);box-shadow:0 16px 38px color-mix(in srgb,var(--visual-blue) 8%,transparent)}.ArticleVisual_heading__UfUS_{display:grid;grid-template-columns:42px minmax(0,1fr);gap:13px;align-items:start;padding:20px clamp(18px,4vw,30px) 17px;border-bottom:1px solid var(--visual-border);background:radial-gradient(circle at 96% 0,color-mix(in srgb,var(--visual-gold) 22%,transparent),transparent 34%),linear-gradient(135deg,var(--visual-surface),color-mix(in srgb,var(--visual-blue-soft) 65%,var(--visual-surface)))}.ArticleVisual_spark__rAxQU{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:var(--visual-gold);color:#0f1f4d;font-size:21px;box-shadow:0 8px 20px color-mix(in srgb,var(--visual-gold) 28%,transparent)}.ArticleVisual_eyebrow__ohFJH{display:block;margin-bottom:4px;color:var(--visual-blue-strong);font-size:10px;font-weight:850;letter-spacing:.13em;text-transform:uppercase}.ArticleVisual_heading__UfUS_ h3{margin:0;color:var(--visual-ink);font-family:var(--brand-font-display,sans-serif);font-size:clamp(18px,2.6vw,24px);line-height:1.18;letter-spacing:-.025em}.ArticleVisual_heading__UfUS_ p{max-width:68ch;margin:6px 0 0;color:var(--visual-muted);font-size:13px;line-height:1.55}.ArticleVisual_stage__lHzjf{overflow-x:auto;overflow-y:hidden;scrollbar-color:var(--visual-blue) var(--visual-blue-soft);scrollbar-width:thin;background:linear-gradient(color-mix(in srgb,var(--visual-blue) 5%,transparent) 1px,transparent 1px),linear-gradient(90deg,color-mix(in srgb,var(--visual-blue) 5%,transparent) 1px,transparent 1px),var(--visual-canvas);background-size:24px 24px}.ArticleVisual_svg__UbjO0{display:block;width:100%;min-width:560px;height:auto;color:var(--visual-ink);font-family:var(--brand-font-body,sans-serif)}.ArticleVisual_scrollHint__xfCNc{display:none;padding:6px 16px;border-top:1px solid var(--visual-border);background:var(--visual-blue-soft);color:var(--visual-muted);font-size:10px;text-align:center}.ArticleVisual_figure__MnkaY figcaption{display:grid;gap:9px;padding:16px clamp(18px,4vw,30px) 19px;border-top:1px solid var(--visual-border);color:var(--visual-muted);font-size:12px;line-height:1.55}.ArticleVisual_figure__MnkaY figcaption strong{display:flex;gap:8px;align-items:flex-start;color:var(--visual-ink);font-size:13px}.ArticleVisual_figure__MnkaY figcaption strong>span{color:var(--visual-blue);font-size:17px;line-height:1.1}.ArticleVisual_screenReaderData__G3F1g{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.ArticleVisual_connector__msktL,.ArticleVisual_cycleConnector__wtpGo{fill:none;stroke:var(--visual-blue);stroke-linecap:round;stroke-width:4}.ArticleVisual_arrowHead__ZY0fN{fill:var(--visual-blue)}.ArticleVisual_conceptCenterHalo__gal6_,.ArticleVisual_nodeHalo__4zA6s,.ArticleVisual_timelinePointHalo__y_kTN{fill:color-mix(in srgb,var(--visual-blue) 12%,transparent)}.ArticleVisual_closedPoint__AKXsV,.ArticleVisual_node__FmEdd,.ArticleVisual_timelinePoint__8Fhtr,.ArticleVisual_valuePoint__KZyFf{fill:var(--visual-blue);stroke:var(--visual-surface);stroke-width:3}.ArticleVisual_nodeNumber__XMt8W{fill:var(--brand-on-primary,#fff);font-size:20px;font-weight:900}.ArticleVisual_compareTitle__oNmqb,.ArticleVisual_conceptCenterLabel__TuInA,.ArticleVisual_cycleCenterLabel__zWmQp,.ArticleVisual_nodeTitle__X0QXF,.ArticleVisual_rootTitle__Rm2_C{fill:var(--visual-ink);font-size:14px;font-weight:850}.ArticleVisual_compareItem__39lyr,.ArticleVisual_nodeDetail__QtDF7,.ArticleVisual_timelineLabel__o3__V{fill:var(--visual-muted);font-size:10px}.ArticleVisual_comparisonDivider__vIV1l{stroke:var(--visual-border);stroke-dasharray:5 9;stroke-width:2}.ArticleVisual_compareCard__57Eag{fill:var(--visual-surface);stroke-width:2}.ArticleVisual_compareLeft__Tlbma{stroke:var(--visual-blue)}.ArticleVisual_compareRight__QhFVh{stroke:color-mix(in srgb,var(--visual-gold) 80%,var(--visual-ink))}.ArticleVisual_bullet__q0WTC,.ArticleVisual_rootNode__V_jXx{fill:var(--visual-blue)}.ArticleVisual_rootTitle__Rm2_C{fill:var(--brand-on-primary,#fff);font-size:16px}.ArticleVisual_conceptLine___dp9w,.ArticleVisual_hierarchyLine__WRmqX{fill:none;stroke:color-mix(in srgb,var(--visual-blue) 48%,var(--visual-border));stroke-width:3}.ArticleVisual_branchNode__0mnEg,.ArticleVisual_conceptNode__HQKw5{fill:var(--visual-surface);stroke:var(--visual-blue);stroke-width:2}.ArticleVisual_branchTitle__vjEqk{fill:var(--visual-ink);font-size:11px;font-weight:800}.ArticleVisual_timelineAxis__ZnRKw,.ArticleVisual_timelineStem__2VniW,.ArticleVisual_valueStem__paSYX{fill:none;stroke:var(--visual-border);stroke-width:3}.ArticleVisual_timelinePoint__8Fhtr{fill:var(--visual-gold);stroke:var(--visual-ink);stroke-width:2}.ArticleVisual_timelineDate__lVbaf{fill:var(--visual-blue-strong);font-size:12px;font-weight:850}.ArticleVisual_conceptCenter__Y1_zF,.ArticleVisual_cycleCenter__u3vt6{fill:var(--visual-surface);stroke:var(--visual-blue);stroke-width:3}.ArticleVisual_cycleNode__gy0uQ{fill:var(--visual-blue);stroke:var(--visual-surface);stroke-width:4}.ArticleVisual_cycleLabel__ZVNq3{fill:var(--visual-ink);font-size:10px;font-weight:750}.ArticleVisual_axisArrow__HLwCE,.ArticleVisual_numberAxis__TlEGw,.ArticleVisual_tick__Bn6mr{fill:none;stroke:var(--visual-ink);stroke-width:3}.ArticleVisual_axisArrow__HLwCE{stroke-linecap:round;stroke-linejoin:round}.ArticleVisual_numberSegment__Ti_Jv{stroke:var(--visual-gold);stroke-linecap:round;stroke-width:12}.ArticleVisual_openPoint___mhzl{fill:var(--visual-surface);stroke:var(--visual-blue);stroke-width:4}.ArticleVisual_tickLabel__lUEHF{fill:var(--visual-muted);font-size:10px}.ArticleVisual_valuePointHalo__TeTth{fill:color-mix(in srgb,var(--visual-gold) 34%,transparent)}.ArticleVisual_segmentLabel__24VqH,.ArticleVisual_valueLabel__EWYsN{fill:var(--visual-blue-strong);font-size:11px;font-weight:800}.ArticleVisual_fractionLarge__bKlnc{fill:var(--visual-blue-strong);font-size:36px;font-weight:900}.ArticleVisual_fractionEmpty__DEou6,.ArticleVisual_fractionFilled__R8MfA{stroke:var(--visual-blue);stroke-width:2}.ArticleVisual_fractionFilled__R8MfA{fill:var(--visual-gold)}.ArticleVisual_fractionEmpty__DEou6{fill:var(--visual-surface)}.ArticleVisual_fractionPartLabel__DtjAL{fill:var(--visual-ink);font-size:16px;font-weight:800}.ArticleVisual_geometryShape__8HuZA{fill:color-mix(in srgb,var(--visual-blue) 13%,var(--visual-surface));stroke:var(--visual-blue);stroke-linejoin:round;stroke-width:5}.ArticleVisual_geometryGuide__xi99I{fill:none;stroke:color-mix(in srgb,var(--visual-gold) 80%,var(--visual-ink));stroke-dasharray:7 7;stroke-width:4}.ArticleVisual_geometryCorner__Hs5rr{fill:none;stroke:var(--visual-gold);stroke-width:4}.ArticleVisual_geometryPoint__VaDAu{fill:var(--visual-ink)}.ArticleVisual_geometryLabel__W41PF{fill:var(--visual-ink);font-size:16px;font-weight:850}.ArticleVisual_formulaCard__BTcHv{fill:var(--visual-surface);stroke:var(--visual-gold);stroke-width:3}.ArticleVisual_formulaText__XuBh9{fill:var(--visual-ink);font-size:15px;font-weight:850}.ArticleVisual_languageMode__G6y4O{fill:var(--visual-muted);font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.ArticleVisual_languagePart__WUfC5{stroke-width:2}.ArticleVisual_languageTone1__AmyQU{fill:color-mix(in srgb,var(--visual-blue) 16%,var(--visual-surface));stroke:var(--visual-blue)}.ArticleVisual_languageTone2__w8xLE{fill:color-mix(in srgb,var(--visual-gold) 25%,var(--visual-surface));stroke:color-mix(in srgb,var(--visual-gold) 75%,var(--visual-ink))}.ArticleVisual_languageTone3__9tboH{fill:color-mix(in srgb,#40bd8a 17%,var(--visual-surface));stroke:#2c936c}.ArticleVisual_languageTone4__R2Nox{fill:color-mix(in srgb,#a879f1 15%,var(--visual-surface));stroke:#8159c0}.ArticleVisual_languageText__sd9Pq{fill:var(--visual-ink);font-size:15px;font-weight:850}.ArticleVisual_languageStem__XePNI{stroke:var(--visual-border);stroke-width:2}.ArticleVisual_languageRole__uw3Cr{fill:var(--visual-blue-strong);font-size:11px;font-weight:800}.ArticleVisual_chartAxis__tzjil{fill:none;stroke:var(--visual-ink);stroke-linecap:round;stroke-width:3}.ArticleVisual_bar__3XuyE{fill:var(--visual-blue)}.ArticleVisual_barTone2__cDto_{fill:var(--visual-gold)}.ArticleVisual_barTone3__x7W1o{fill:#40bd8a}.ArticleVisual_barTone4__6c6oK{fill:#a879f1}.ArticleVisual_barValue__WWP7e{fill:var(--visual-ink);font-size:10px;font-weight:800}.ArticleVisual_barLabel__i_Ls6{fill:var(--visual-muted);font-size:10px}.ArticleVisual_conceptCenterLabel__TuInA{fill:var(--brand-on-primary,#fff);font-size:13px}.ArticleVisual_conceptCenter__Y1_zF{fill:var(--visual-blue);stroke:var(--visual-surface);stroke-width:4}@media (max-width:640px){.ArticleVisual_figure__MnkaY{margin:22px 0;border-radius:18px}.ArticleVisual_heading__UfUS_{grid-template-columns:36px minmax(0,1fr);gap:10px;padding:16px}.ArticleVisual_spark__rAxQU{width:36px;height:36px;border-radius:12px;font-size:18px}.ArticleVisual_svg__UbjO0{min-width:720px}.ArticleVisual_scrollHint__xfCNc{display:block}.ArticleVisual_figure__MnkaY figcaption{padding:14px 16px 16px}}@media (prefers-reduced-motion:reduce){.ArticleVisual_stage__lHzjf{scroll-behavior:auto}}@media print{.ArticleVisual_figure__MnkaY{break-inside:avoid;box-shadow:none}.ArticleVisual_stage__lHzjf{overflow:visible;background:#fff}.ArticleVisual_svg__UbjO0{min-width:0}.ArticleVisual_scrollHint__xfCNc{display:none}}.LivingLesson_lessonHero__GH3ai{position:relative;overflow:hidden;max-width:none;margin-bottom:22px;padding:clamp(26px,4vw,48px);border:1px solid color-mix(in srgb,var(--accent) 22%,var(--border));border-radius:clamp(20px,3vw,30px);background:radial-gradient(circle at 88% 16%,color-mix(in srgb,var(--gold) 30%,transparent) 0 9%,transparent 28%),radial-gradient(circle at 72% 105%,color-mix(in srgb,var(--accent) 18%,transparent) 0 24%,transparent 55%),linear-gradient(135deg,var(--surface),color-mix(in srgb,var(--accent-soft) 64%,var(--surface)));box-shadow:0 24px 60px color-mix(in srgb,var(--accent) 9%,transparent)}.LivingLesson_russianDeepDive__yPpAH{margin:25px 0;padding:clamp(18px,3vw,28px);border:1px solid color-mix(in srgb,var(--accent) 22%,var(--border));border-radius:22px;background:color-mix(in srgb,var(--accent-soft) 33%,var(--surface))}.LivingLesson_russianDeepDive__yPpAH h3{margin:8px 0 16px}.LivingLesson_russianDeepDive__yPpAH p{line-height:1.7}.LivingLesson_lessonHero__GH3ai:before{position:absolute;top:28px;right:34px;width:46px;height:46px;border:9px solid color-mix(in srgb,var(--gold) 52%,transparent);border-radius:14px;content:"";opacity:.34;transform:rotate(18deg)}.LivingLesson_heroGrid__R2oR0{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1fr) minmax(225px,285px);gap:clamp(24px,4vw,58px);align-items:end}.LivingLesson_heroCopy__e8eoo{min-width:0}.LivingLesson_lessonHero__GH3ai .LivingLesson_heroCopy__e8eoo h1{max-width:820px;margin:22px 0 16px;font-size:clamp(36px,4.8vw,64px);line-height:1.02;letter-spacing:-.055em;text-wrap:balance}.LivingLesson_lessonHero__GH3ai .LivingLesson_heroCopy__e8eoo>p{max-width:760px;margin-bottom:0;color:var(--ink);font-size:clamp(15px,1.5vw,18px);line-height:1.72}.LivingLesson_heroFooter__ltZai{padding-top:19px;border-top:1px solid color-mix(in srgb,var(--accent) 16%,var(--border))}.LivingLesson_mentorCard__Aghzi{display:grid;grid-template-columns:92px minmax(0,1fr);align-items:end;gap:4px;padding:13px 15px 13px 4px;border:1px solid color-mix(in srgb,var(--gold) 46%,var(--border));border-radius:19px;background:color-mix(in srgb,var(--surface) 88%,var(--gold));box-shadow:0 12px 28px color-mix(in srgb,var(--ink) 7%,transparent)}.LivingLesson_mentorMascot__28n_j{align-self:end;width:108px;max-width:none;margin:-33px -5px -7px -12px;filter:drop-shadow(0 12px 15px color-mix(in srgb,var(--accent) 20%,transparent))}.LivingLesson_mentorCard__Aghzi strong{display:block;margin-bottom:4px;color:var(--accent-strong);font-size:11px;font-weight:850;letter-spacing:.08em;text-transform:uppercase}.LivingLesson_lessonHero__GH3ai .LivingLesson_mentorCard__Aghzi p{margin:0;color:var(--ink);font-size:11px;line-height:1.55}.LivingLesson_learningPath__bqq3i{overflow:hidden;margin-bottom:30px;border:1px solid var(--border);border-radius:20px;background:var(--surface);box-shadow:0 12px 35px color-mix(in srgb,var(--ink) 5%,transparent)}.LivingLesson_journeyHeading__bEfx9{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:16px 20px 14px;border-bottom:1px solid var(--border)}.LivingLesson_journeyHeading__bEfx9>div{display:grid;gap:1px}.LivingLesson_journeyHeading__bEfx9 small,.LivingLesson_journeyHeading__bEfx9 span{color:var(--accent);font-size:9px;font-weight:850;letter-spacing:.13em;text-transform:uppercase}.LivingLesson_journeyHeading__bEfx9 strong{font-family:var(--brand-font-display);font-size:14px}.LivingLesson_journeyHeading__bEfx9 small{padding:5px 9px;border-radius:999px;background:var(--accent-soft);white-space:nowrap}.LivingLesson_learningPath__bqq3i ol{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin:0;padding:0;list-style:none}.LivingLesson_learningPath__bqq3i li{position:relative;min-width:0}.LivingLesson_learningPath__bqq3i li+li:before{position:absolute;top:50%;left:-8px;z-index:2;width:16px;height:1px;background:var(--border);content:""}.LivingLesson_learningPath__bqq3i a{display:flex;align-items:center;gap:11px;min-height:76px;padding:13px 16px;color:var(--ink);transition:background .16s ease,color .16s ease}.LivingLesson_learningPath__bqq3i a:hover{background:var(--accent-soft);color:var(--accent-strong)}.LivingLesson_learningPath__bqq3i a>span:last-child{display:grid;min-width:0}.LivingLesson_learningPath__bqq3i a strong{font-family:var(--brand-font-display);font-size:13px}.LivingLesson_learningPath__bqq3i a small{overflow:hidden;color:var(--muted);font-size:9px;line-height:1.35;text-overflow:ellipsis}.LivingLesson_journeyNumber__K_WnY{display:grid;flex:0 0 34px;place-items:center;width:34px;height:34px;border:1px solid color-mix(in srgb,var(--accent) 30%,var(--border));border-radius:50%;background:var(--surface);color:var(--accent);font-size:11px;font-weight:900;box-shadow:inset 0 0 0 4px var(--accent-soft)}.LivingLesson_learningPath__bqq3i li:last-child .LivingLesson_journeyNumber__K_WnY{border-color:color-mix(in srgb,var(--gold) 66%,var(--border));background:color-mix(in srgb,var(--gold) 16%,var(--surface));color:var(--ink);box-shadow:none}.LivingLesson_lessonLayout__W_WT_{grid-template-columns:minmax(0,1fr) minmax(225px,260px);gap:clamp(26px,4vw,52px);align-items:start}.LivingLesson_lessonArticle__v_wW3{min-width:0;padding:0;border:0;background:transparent;font-size:15px;line-height:1.82}.LivingLesson_lessonArticle__v_wW3>.LivingLesson_finalCheck__WNNZz,.LivingLesson_lessonArticle__v_wW3>section{scroll-margin-top:26px}.LivingLesson_lessonArticle__v_wW3>.LivingLesson_finalCheck__WNNZz+section,.LivingLesson_lessonArticle__v_wW3>section+.LivingLesson_finalCheck__WNNZz,.LivingLesson_lessonArticle__v_wW3>section+section{margin-top:24px;padding-top:0;border-top:0}.LivingLesson_chapter__4R833,.LivingLesson_finalCheck__WNNZz,.LivingLesson_glossaryCard__CV_qF,.LivingLesson_outcomesCard__XFBlm,.LivingLesson_routeCard___Y0Q6,.LivingLesson_sourcesCard__Sjypv,.LivingLesson_verifyCard__kHNq_{overflow:hidden;padding:clamp(24px,4vw,39px);border:1px solid var(--border);border-radius:22px;background:var(--surface);box-shadow:0 15px 44px color-mix(in srgb,var(--ink) 5%,transparent)}.LivingLesson_outcomesCard__XFBlm{position:relative;background:linear-gradient(135deg,color-mix(in srgb,var(--accent-soft) 65%,var(--surface)),var(--surface) 64%)}.LivingLesson_outcomesCard__XFBlm:after{position:absolute;top:28px;right:30px;width:10px;height:10px;border-radius:50%;background:var(--gold);box-shadow:17px 7px 0 -3px var(--gold),8px 22px 0 -4px var(--gold);content:"";opacity:.75}.LivingLesson_lessonArticle__v_wW3 .LivingLesson_chapter__4R833{margin-top:24px;padding-top:clamp(24px,4vw,39px);border:1px solid var(--border)}.LivingLesson_lessonArticle__v_wW3 .LivingLesson_chapter__4R833+.LivingLesson_chapter__4R833{margin-top:24px;padding-top:clamp(24px,4vw,39px);border-top:1px solid var(--border)}.LivingLesson_sectionIntroCard__EApXf{background:linear-gradient(130deg,color-mix(in srgb,var(--accent) 9%,var(--surface)),var(--surface) 72%)}.LivingLesson_sectionIntroCard__EApXf>p:last-child{max-width:660px;margin-bottom:0;color:var(--muted)}.LivingLesson_chapterProgress__lp6Ar{display:grid;grid-template-columns:auto minmax(90px,1fr) auto;align-items:center;gap:12px;margin:-4px 0 25px;color:var(--muted);font-size:9px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.LivingLesson_chapterProgress__lp6Ar progress{overflow:hidden;width:100%;height:5px;border:0;border-radius:999px;background:var(--accent-soft);color:var(--accent)}.LivingLesson_chapterProgress__lp6Ar progress::-webkit-progress-bar{border-radius:999px;background:var(--accent-soft)}.LivingLesson_chapterProgress__lp6Ar progress::-webkit-progress-value{border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--gold))}.LivingLesson_chapterProgress__lp6Ar progress::-moz-progress-bar{border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--gold))}.LivingLesson_lessonArticle__v_wW3 .LivingLesson_chapter__4R833>.math-section-title:first-of-type{margin-bottom:21px}.LivingLesson_lessonArticle__v_wW3 .LivingLesson_chapter__4R833>.math-section-title:first-of-type h2{margin-top:1px;font-size:clamp(24px,3vw,34px);line-height:1.18;letter-spacing:-.035em;text-wrap:balance}.LivingLesson_examplesBlock__LBAg6,.LivingLesson_formulaBlock__gg7tp,.LivingLesson_methodBlock__HJy6_,.LivingLesson_mistakesBlock__HfQT4,.LivingLesson_practiceBlock__dqHbK,.LivingLesson_understandBlock__0bKC_{margin-top:22px;border-radius:16px}.LivingLesson_understandBlock__0bKC_{padding:24px;border:1px solid color-mix(in srgb,var(--accent) 20%,var(--border));background:color-mix(in srgb,var(--accent-soft) 52%,var(--surface))}.LivingLesson_understandBlock__0bKC_>p:not(.LivingLesson_blockLabel__eyxc_){max-width:68ch}.LivingLesson_understandBlock__0bKC_>p:last-child{margin-bottom:0}.LivingLesson_blockLabel__eyxc_{display:inline-flex;align-items:center;gap:7px;margin:0 0 15px;color:var(--accent);font-size:10px;font-weight:850;letter-spacing:.14em;text-transform:uppercase}.LivingLesson_ruleBlock__qHdKM{position:relative;margin:19px 0 0;padding:20px 22px 20px 25px;border:1px solid color-mix(in srgb,var(--gold) 64%,var(--border));border-left:5px solid var(--gold);border-radius:4px 14px 14px 4px;background:color-mix(in srgb,var(--gold) 13%,var(--surface))}.LivingLesson_ruleBlock__qHdKM>strong{color:var(--ink);font-size:10px;font-weight:900;letter-spacing:.11em;text-transform:uppercase}.LivingLesson_ruleBlock__qHdKM p:last-child{margin:7px 0 0}.LivingLesson_theoryBlock__Zhhm_{margin-top:16px;padding:21px 22px;border:1px solid color-mix(in srgb,var(--accent) 16%,var(--border));border-radius:14px;background:var(--surface);box-shadow:none}.LivingLesson_theoryBlock__Zhhm_ h3{font-size:18px;line-height:1.35}.LivingLesson_formulaBlock__gg7tp{padding:23px;border:1px solid color-mix(in srgb,var(--accent) 19%,var(--border));background:color-mix(in srgb,var(--subtle) 65%,var(--surface))}.LivingLesson_formulaBlock__gg7tp .formula{padding:17px 12px;border-radius:12px;background:var(--surface)}.LivingLesson_formulaBlock__gg7tp .math-notation-list{margin-top:14px}.LivingLesson_methodBlock__HJy6_{padding:23px;border:1px solid color-mix(in srgb,var(--accent) 21%,var(--border));background:var(--surface)}.LivingLesson_examplesBlock__LBAg6 .core-course-examples-title,.LivingLesson_formulaBlock__gg7tp .core-course-method-title,.LivingLesson_methodBlock__HJy6_ .core-course-method-title{margin-top:0}.LivingLesson_methodBlock__HJy6_ .math-method-list li{align-items:flex-start}.LivingLesson_methodBlock__HJy6_ .math-method-list li:before{width:32px;height:32px;margin-top:1px;background:var(--accent);color:var(--on-accent);box-shadow:0 5px 14px color-mix(in srgb,var(--accent) 22%,transparent)}.LivingLesson_examplesBlock__LBAg6{padding:23px;border:1px solid color-mix(in srgb,var(--accent) 20%,var(--border));background:linear-gradient(var(--surface),var(--surface)) padding-box,linear-gradient(135deg,var(--accent),var(--gold)) border-box}.LivingLesson_exampleCard__ffvqg{padding:24px!important;border:1px solid var(--border)!important;background:color-mix(in srgb,var(--paper) 62%,var(--surface));box-shadow:0 8px 22px color-mix(in srgb,var(--ink) 4%,transparent)}.LivingLesson_exampleCard__ffvqg .math-example-answer{border-left:3px solid var(--accent)}.LivingLesson_practiceBlock__dqHbK{scroll-margin-top:26px;padding:24px;border:1px solid color-mix(in srgb,var(--accent) 35%,var(--border));background:color-mix(in srgb,var(--accent-soft) 45%,var(--surface))}.LivingLesson_practiceBlock__dqHbK .math-section-title>svg{color:var(--accent)}.LivingLesson_practiceBlock__dqHbK details{transition:border-color .15s ease,background .15s ease}.LivingLesson_practiceBlock__dqHbK details[open]{border-color:color-mix(in srgb,var(--accent) 40%,var(--border));background:var(--surface)}.LivingLesson_practiceBlock__dqHbK summary{line-height:1.55}.LivingLesson_mistakesBlock__HfQT4{padding:19px 21px;border:1px solid color-mix(in srgb,#c66a42 30%,var(--border));background:color-mix(in srgb,#f4a261 9%,var(--surface))}.LivingLesson_mistakesBlock__HfQT4 .core-course-mistakes-title{margin-top:0}.LivingLesson_mistakesBlock__HfQT4 .math-mistake-list{font-size:13px}.LivingLesson_whyCard__qQK0G{border:1px solid color-mix(in srgb,var(--gold) 38%,var(--border));background:color-mix(in srgb,var(--gold) 11%,var(--surface))}.LivingLesson_lessonLink___aUCp{margin:23px 0 0}.LivingLesson_lessonLink___aUCp .button{text-decoration:none}.LivingLesson_glossaryCard__CV_qF{background:color-mix(in srgb,var(--subtle) 65%,var(--surface))}.LivingLesson_finalCheck__WNNZz{position:relative;scroll-margin-top:26px;border-color:color-mix(in srgb,var(--accent) 35%,var(--border));background:radial-gradient(circle at 100% 0,color-mix(in srgb,var(--gold) 18%,transparent),transparent 28%),var(--surface)}.LivingLesson_stageHeading__kogYP{display:flex;align-items:center;gap:11px;margin-bottom:25px;padding-bottom:17px;border-bottom:1px solid var(--border)}.LivingLesson_stageHeading__kogYP span{padding:6px 9px;border-radius:999px;background:var(--accent);color:var(--on-accent);font-size:9px;font-weight:900;letter-spacing:.1em;text-transform:uppercase}.LivingLesson_stageHeading__kogYP strong{font-family:var(--brand-font-display);font-size:14px}.LivingLesson_finalCheck__WNNZz .math-practice{margin-top:0;padding-top:0;border-top:0}.LivingLesson_finalCheck__WNNZz .math-check-card{background:color-mix(in srgb,var(--paper) 65%,var(--surface))}.LivingLesson_embeddedPracticeNote__H6OMG{display:flex;align-items:flex-start;gap:15px;padding:22px;border-radius:14px;background:var(--accent-soft)}.LivingLesson_embeddedPracticeNote__H6OMG>svg{margin-top:3px;color:var(--accent)}.LivingLesson_embeddedPracticeNote__H6OMG h2{margin:0 0 6px;font-size:18px}.LivingLesson_embeddedPracticeNote__H6OMG p{margin-bottom:9px}.LivingLesson_embeddedPracticeNote__H6OMG a{font-weight:800}.LivingLesson_verifyCard__kHNq_{border-color:color-mix(in srgb,var(--gold) 54%,var(--border));background:linear-gradient(135deg,color-mix(in srgb,var(--gold) 14%,var(--surface)),var(--surface) 72%)}.LivingLesson_verifyCard__kHNq_ .LivingLesson_stageHeading__kogYP span{background:var(--gold);color:var(--ink)}.LivingLesson_verifyCard__kHNq_ h2{margin-top:0}.LivingLesson_verifyCard__kHNq_ ul{display:grid;gap:10px;margin:0;padding:0;list-style:none}.LivingLesson_verifyCard__kHNq_ li{display:flex;align-items:flex-start;gap:9px;margin:0}.LivingLesson_verifyCard__kHNq_ li svg{margin-top:5px;color:var(--accent)}.LivingLesson_routeCard___Y0Q6 .core-course-resource-list{margin-top:20px}.LivingLesson_sourcesCard__Sjypv{box-shadow:none}.LivingLesson_sourcesCard__Sjypv>p{max-width:66ch}.LivingLesson_lessonSide__6c5Dd{position:sticky;top:var(--shell-sticky-offset)}.LivingLesson_sideCard__dSJvB{overflow:hidden;padding:21px;border-radius:17px;box-shadow:0 12px 36px color-mix(in srgb,var(--ink) 5%,transparent)}.LivingLesson_sideCard__dSJvB>h3{margin-bottom:2px;font-family:var(--brand-font-display);font-size:15px}.LivingLesson_sideProgress__CiMDn{margin:0 0 12px;color:var(--muted);font-size:9px}.LivingLesson_sideCard__dSJvB a{border-radius:8px;line-height:1.45;transition:padding .15s ease,background .15s ease}.LivingLesson_sideCard__dSJvB a:hover{padding-inline:8px;background:var(--accent-soft)}.LivingLesson_pagination__oRUaA a{min-height:76px;padding:20px;border-radius:16px;box-shadow:0 8px 25px color-mix(in srgb,var(--ink) 4%,transparent)}@media (max-width:1180px){.LivingLesson_heroGrid__R2oR0{grid-template-columns:minmax(0,1fr) 250px}.LivingLesson_lessonLayout__W_WT_{grid-template-columns:minmax(0,1fr)}.LivingLesson_lessonSide__6c5Dd{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;position:static}.LivingLesson_sideCard__dSJvB{margin-top:0}}@media (max-width:820px){.LivingLesson_lessonHero__GH3ai{padding:28px}.LivingLesson_heroGrid__R2oR0{grid-template-columns:minmax(0,1fr)}.LivingLesson_mentorCard__Aghzi{grid-template-columns:76px minmax(0,1fr);max-width:520px;margin-top:12px}.LivingLesson_mentorMascot__28n_j{width:92px}.LivingLesson_learningPath__bqq3i ol{grid-template-columns:repeat(2,minmax(0,1fr))}.LivingLesson_learningPath__bqq3i li+li:before{display:none}.LivingLesson_learningPath__bqq3i li:nth-child(2n){border-left:1px solid var(--border)}.LivingLesson_learningPath__bqq3i li:nth-child(n+3){border-top:1px solid var(--border)}}@media (max-width:560px){.LivingLesson_lessonHero__GH3ai{margin-inline:-4px;padding:23px 20px 20px;border-radius:20px}.LivingLesson_lessonHero__GH3ai:before{top:18px;right:18px;width:33px;height:33px;border-width:7px}.LivingLesson_lessonHero__GH3ai .LivingLesson_heroCopy__e8eoo h1{margin-top:18px;font-size:clamp(32px,11vw,44px)}.LivingLesson_heroFooter__ltZai{align-items:stretch}.LivingLesson_mentorCard__Aghzi{grid-template-columns:62px minmax(0,1fr);padding:10px 12px 10px 2px}.LivingLesson_mentorMascot__28n_j{width:78px;margin:-21px -2px -4px -9px}.LivingLesson_learningPath__bqq3i{border-radius:16px}.LivingLesson_journeyHeading__bEfx9{align-items:flex-start;padding:14px 15px}.LivingLesson_journeyHeading__bEfx9 strong{font-size:12px}.LivingLesson_learningPath__bqq3i a{min-height:72px;padding:11px 10px}.LivingLesson_journeyNumber__K_WnY{flex-basis:29px;width:29px;height:29px}.LivingLesson_learningPath__bqq3i a strong{font-size:12px}.LivingLesson_learningPath__bqq3i a small{display:none}.LivingLesson_lessonArticle__v_wW3{font-size:14px;line-height:1.76}.LivingLesson_chapter__4R833,.LivingLesson_finalCheck__WNNZz,.LivingLesson_glossaryCard__CV_qF,.LivingLesson_outcomesCard__XFBlm,.LivingLesson_routeCard___Y0Q6,.LivingLesson_sourcesCard__Sjypv,.LivingLesson_verifyCard__kHNq_{padding:21px 18px;border-radius:17px}.LivingLesson_lessonArticle__v_wW3 .LivingLesson_chapter__4R833,.LivingLesson_lessonArticle__v_wW3 .LivingLesson_chapter__4R833+.LivingLesson_chapter__4R833{padding-top:21px}.LivingLesson_chapterProgress__lp6Ar{grid-template-columns:auto 1fr;gap:8px}.LivingLesson_chapterProgress__lp6Ar progress{grid-column:1/-1;grid-row:2}.LivingLesson_chapterProgress__lp6Ar>span:last-child{justify-self:end}.LivingLesson_examplesBlock__LBAg6,.LivingLesson_formulaBlock__gg7tp,.LivingLesson_methodBlock__HJy6_,.LivingLesson_mistakesBlock__HfQT4,.LivingLesson_practiceBlock__dqHbK,.LivingLesson_understandBlock__0bKC_{padding:18px 16px;border-radius:13px}.LivingLesson_lessonArticle__v_wW3 .LivingLesson_chapter__4R833>.math-section-title:first-of-type h2{font-size:24px}.LivingLesson_exampleCard__ffvqg{padding:19px!important}.LivingLesson_stageHeading__kogYP{align-items:flex-start;flex-direction:column}.LivingLesson_embeddedPracticeNote__H6OMG{padding:18px}.LivingLesson_lessonSide__6c5Dd{grid-template-columns:minmax(0,1fr)}}@media (prefers-reduced-motion:reduce){.LivingLesson_learningPath__bqq3i a,.LivingLesson_practiceBlock__dqHbK details,.LivingLesson_sideCard__dSJvB a{transition:none}}