.ArticleColumn_page__wDrUI{--column:760px;--space-xs:8px;--space-s:12px;--space-m:16px;--space-l:24px;--space-xl:48px;--space-section:112px;--space-region:144px;--gutter:24px;background:rgb(var(--home-paper));padding:88px var(--gutter) 144px;container-type:inline-size}.ArticleColumn_page__wDrUI[data-subject=reading]{--accent:var(--home-reading);--accent-tint:var(--home-reading-tint)}.ArticleColumn_page__wDrUI[data-subject=grammar]{--accent:var(--home-grammar);--accent-tint:var(--home-grammar-tint)}.ArticleColumn_page__wDrUI[data-subject=skills]{--accent:var(--home-skills);--accent-tint:var(--home-skills-tint)}.ArticleColumn_page__wDrUI[data-subject=vocabulary]{--accent:var(--home-vocabulary);--accent-tint:var(--home-vocabulary-tint)}.ArticleColumn_page__wDrUI[data-subject=ai]{--accent:var(--home-violet);--subject-color:rgb(var(--home-violet));--subject-soft:light-dark(#eeebf6,color-mix(in srgb,rgb(var(--home-violet)) 18%,rgb(var(--home-paper))))}.ArticleColumn_frame__v8F6V{width:min(var(--column),100%);margin-inline:auto}.ArticleColumn_page__wDrUI[data-contents]{--rail-gap:28px;--rail-w:44px;--rail-inset:calc(var(--wordmark-x) - var(--gutter));--rail-room:calc(var(--rail-inset) + var(--rail-w) + var(--rail-gap))}.ArticleColumn_page__wDrUI[data-contents]:has(.ArticleColumn_contents__7Jf26 [data-mode=list]){--rail-w:205px}.ArticleColumn_article__SJ4Mu{display:grid;grid-template-columns:minmax(0,1fr)}.ArticleColumn_heroFrame__elRpV{grid-row:1;grid-column:1}.ArticleColumn_body__DNCZj{grid-row:2;grid-column:1;min-width:0}.ArticleColumn_contents__7Jf26{display:contents}.ArticleColumn_page__wDrUI[data-contents] section:has(>h2:not(:first-child))>h2{scroll-margin-top:calc(130px + 64px)}.ArticleColumn_contents__7Jf26>aside{grid-row:2;grid-column:1;justify-self:start;margin:var(--space-xl) 0 0 var(--rail-inset)}@media (min-width:851px){.ArticleColumn_contents__7Jf26>aside[data-mode=list]{width:205px}.ArticleColumn_page__wDrUI[data-contents] .ArticleColumn_body__DNCZj{--rail-pad:clamp(0px,2 * var(--rail-room) + 880px - 100cqi,var(--rail-room));--rail-track:calc(100cqi - var(--rail-pad))}.ArticleColumn_page__wDrUI[data-contents] .ArticleColumn_body__DNCZj .ArticleColumn_frame__v8F6V{width:min(var(--column),var(--rail-track));margin-left:calc(var(--rail-pad) + (var(--rail-track) - min(var(--column), var(--rail-track))) / 2);margin-right:0}.ArticleColumn_page__wDrUI[data-contents]:has(.ArticleColumn_contents__7Jf26 [data-animate]) .ArticleColumn_body__DNCZj .ArticleColumn_frame__v8F6V{transition:margin-left .46s cubic-bezier(.22,.8,.24,1),width .46s cubic-bezier(.22,.8,.24,1)}}@media (max-width:850px){.ArticleColumn_article__SJ4Mu{display:block}.ArticleColumn_contents__7Jf26>aside{margin:var(--space-xl) 0 0}.ArticleColumn_page__wDrUI[data-contents] :is(h2,section)[id]{scroll-margin-top:calc(var(--header-h) + 78px)}.ArticleColumn_page__wDrUI[data-contents] section:has(>h2:not(:first-child))>h2{scroll-margin-top:calc(var(--header-h) + 78px + 64px)}}:where(.ArticleColumn_page__wDrUI) :where(p){font:var(--lesson-read);margin:0}:where(.ArticleColumn_page__wDrUI) :where(p+p){margin-top:var(--space-l)}:where(.ArticleColumn_page__wDrUI) :where(h2){font-size:var(--type-title);line-height:1.15;margin:0 0 var(--space-m);text-wrap:balance}.ArticleColumn_frame__v8F6V h2{font-weight:500}.ArticleColumn_crumbs__sejYN{display:flex;align-items:center;gap:8px;margin:0 0 40px;font:var(--lesson-label);color:rgb(var(--home-muted))}.ArticleColumn_crumbs__sejYN a{display:inline-flex;align-items:center;gap:6px;color:inherit;text-decoration:none;transition:color .18s ease}.ArticleColumn_crumbs__sejYN a:hover{color:rgb(var(--accent,var(--home-math)))}.ArticleColumn_crumbs__sejYN svg{width:14px;height:14px}.ArticleColumn_hero__6h43d h1{font-size:clamp(2.6rem,1.9rem + 2.6vw,3.6rem);line-height:1.05;margin:14px 0 18px;text-wrap:balance}.ArticleColumn_page__wDrUI .ArticleColumn_subtitle___h0g6{font:400 clamp(1.25rem,1.1rem + .6vw,1.5rem)/1.4 var(--font-reading);color:rgb(var(--home-muted));margin:0 0 32px;max-width:40ch}.ArticleColumn_intro__9ZA0n{margin-top:var(--space-xl);padding-top:var(--space-xl);border-top:1px solid rgb(var(--home-border))}.ArticleColumn_mapSection__alg4y{margin-top:var(--space-section);scroll-margin-top:48px}.ArticleColumn_map__Ldxqq{list-style:none;margin:var(--space-l) 0 0;padding:0}.ArticleColumn_mapHead__F574E,.ArticleColumn_mapRow__ip0W8{display:grid;grid-template-columns:minmax(0,1.25fr) 56px minmax(0,1fr);align-items:center}.ArticleColumn_mapHead__F574E{padding:0 0 var(--space-s);font:var(--lesson-label);color:rgb(var(--home-muted));border-bottom:1px solid rgb(var(--home-ink)/.45)}.ArticleColumn_map__Ldxqq li+li .ArticleColumn_mapRow__ip0W8{border-top:1px solid rgb(var(--home-border))}.ArticleColumn_mapRow__ip0W8{padding:20px 0;color:rgb(var(--home-ink));text-decoration:none}.ArticleColumn_mapGiven__iIZss{display:flex;align-items:flex-start;gap:var(--space-m)}.ArticleColumn_mapGiven__iIZss>span:last-child{display:grid;gap:2px;padding-top:2px}.ArticleColumn_mapGiven__iIZss strong{font:600 16px/1.4 var(--font-sans),sans-serif}.ArticleColumn_mapGiven__iIZss strong:first-letter{text-transform:uppercase}.ArticleColumn_mapGiven__iIZss>span:last-child>span{font:400 15px/1.45 var(--font-sans),sans-serif;color:rgb(var(--home-muted))}.ArticleColumn_mapIcon__kjs_2{flex:none;display:grid;place-items:center;width:40px;height:40px;border-radius:12px;border:1px solid rgb(var(--accent,var(--home-math))/.25);color:rgb(var(--accent,var(--home-math)));background:rgb(var(--home-raised));transition:background-color .2s ease,color .2s ease,border-color .2s ease}.ArticleColumn_mapIcon__kjs_2 svg{width:20px;height:20px;stroke-width:1.8}.ArticleColumn_mapArrow__wMoDp{position:relative;height:2px;margin:0 14px}.ArticleColumn_mapArrow__wMoDp span{position:absolute;inset:0;background:rgb(var(--home-border));transition:background-color .22s ease}.ArticleColumn_mapArrow__wMoDp span:after{content:"";position:absolute;right:-1px;top:-4px;width:9px;height:9px;border-top:2px solid rgb(var(--home-border));border-right:2px solid rgb(var(--home-border));transform:rotate(45deg);transition:border-color .22s ease}.ArticleColumn_mapTyped__lDG6E{display:grid;gap:4px}.ArticleColumn_mapTyped__lDG6E>span:first-child{font-size:1.25rem}.ArticleColumn_mapTyped__lDG6E>span:last-child{font:var(--lesson-label);font-weight:500;color:rgb(var(--home-muted))}.ArticleColumn_mapRow__ip0W8:focus-visible .ArticleColumn_mapIcon__kjs_2,.ArticleColumn_mapRow__ip0W8:hover .ArticleColumn_mapIcon__kjs_2{background:rgb(var(--accent,var(--home-math)));border-color:rgb(var(--accent,var(--home-math)));color:rgb(var(--home-on-fill))}.ArticleColumn_mapRow__ip0W8:hover .ArticleColumn_mapArrow__wMoDp span{background:rgb(var(--accent,var(--home-math)))}.ArticleColumn_mapRow__ip0W8:hover .ArticleColumn_mapArrow__wMoDp span:after{border-color:rgb(var(--accent,var(--home-math)))}.ArticleColumn_mapRow__ip0W8:hover .ArticleColumn_mapTyped__lDG6E>span:last-child{color:rgb(var(--accent,var(--home-math)))}.ArticleColumn_mapRow__ip0W8:focus-visible{outline:2px solid rgb(var(--accent,var(--home-math))/.6);outline-offset:6px;border-radius:12px}.ArticleColumn_page__wDrUI .ArticleColumn_mapAfter__f9hCg{margin-top:var(--space-l)}.ArticleColumn_section__DLJV2{margin-top:var(--space-section);scroll-margin-top:48px}.ArticleColumn_cue__57pHo{display:flex;align-items:center;gap:var(--space-s);margin:0 0 var(--space-m)}.ArticleColumn_cueIcon__xxJY8{flex:none;display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:rgb(var(--accent,var(--home-math)));color:rgb(var(--home-on-fill))}.ArticleColumn_cueIcon__xxJY8 svg{width:18px;height:18px;stroke-width:1.9}.ArticleColumn_cueWords__JSeoi{display:grid;grid-template-columns:auto minmax(0,1fr);gap:2px 10px;margin:0;color:rgb(var(--home-ink))}.ArticleColumn_cueWords__JSeoi div{display:contents}.ArticleColumn_cueWords__JSeoi dt{font:var(--lesson-label);line-height:1.45;color:rgb(var(--accent,var(--home-math)));white-space:nowrap}.ArticleColumn_cueWords__JSeoi dd{margin:0;font:var(--lesson-label);font-weight:400;line-height:1.45}.ArticleColumn_page__wDrUI .ArticleColumn_kicker__mSONR{font:var(--lesson-label);color:rgb(var(--accent,var(--home-math)));margin:0}.ArticleColumn_practice__ZbuEe{margin:var(--space-xl) 0}.ArticleColumn_practice__ZbuEe:last-child{margin-bottom:0}.ArticleColumn_figure__vvqWS{margin:var(--space-xl) 0 0}.ArticleColumn_page__wDrUI .ArticleColumn_sectionLink__TEb2Z,.ArticleColumn_setup__uHaH5,.ArticleColumn_setup__uHaH5+.ArticleColumn_practice__ZbuEe{margin-top:var(--space-l)}.ArticleColumn_sectionLink__TEb2Z a{display:inline-grid;gap:4px;color:rgb(var(--home-ink));text-decoration:none}.ArticleColumn_sectionLink__TEb2Z a>span:first-child{font:var(--lesson-read)}.ArticleColumn_sectionLink__TEb2Z strong{color:rgb(var(--accent,var(--home-math)));font-weight:600;border-bottom:1px solid rgb(var(--accent,var(--home-math))/.35)}.ArticleColumn_sectionLinkWhere__Tlj8o{display:inline-flex;align-items:center;gap:6px;font:var(--lesson-label);font-weight:500;color:rgb(var(--home-muted))}.ArticleColumn_sectionLinkWhere__Tlj8o svg{width:15px;height:15px;color:rgb(var(--accent,var(--home-math)));transition:transform .2s ease}.ArticleColumn_sectionLink__TEb2Z a:hover strong{border-bottom-color:rgb(var(--accent,var(--home-math)))}.ArticleColumn_sectionLink__TEb2Z a:hover svg{transform:translateX(3px)}@media (max-width:760px){.ArticleColumn_page__wDrUI{--gutter:16px;--space-l:20px;--space-xl:36px;--space-section:80px;--space-region:96px;padding:56px var(--gutter) 112px}.ArticleColumn_mapHead__F574E{display:none}.ArticleColumn_mapRow__ip0W8{grid-template-columns:minmax(0,1fr);gap:10px;padding:18px 0}.ArticleColumn_mapArrow__wMoDp{display:none}.ArticleColumn_mapTyped__lDG6E{padding-left:56px}.ArticleColumn_cue__57pHo{align-items:flex-start}}.ArticleColumn_closing__M2Vgk{margin-top:var(--space-section)}.ArticleColumn_next__JmrWe{max-width:1120px;margin:var(--space-section) auto 0}