.lrn-page{--lrn-radius:14px;--lrn-focus:hsl(215 90% 42%);padding-block:28px 72px}.lrn-page [tabindex]:focus-visible,.lrn-page a:focus-visible,.lrn-page button:focus-visible,.lrn-page input:focus-visible,.lrn-page summary:focus-visible{outline:3px solid var(--lrn-focus);outline-offset:2px;border-radius:6px}.lrn-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}.lrn-cover{--lrn-ink:hsl(var(--h) 48% 24%);--lrn-tint:hsl(var(--h) 62% 72%/0.75);position:relative;display:block;width:100%;aspect-ratio:16/10;border-radius:12px;overflow:hidden;background:hsl(var(--h) 55% 90%);background:radial-gradient(circle at calc(var(--p) * 1%) calc(var(--q) * 1%),hsl(var(--h) 80% 97%/.9) 0 2px,transparent 3px),radial-gradient(circle at calc(100% - var(--q) * 1%) calc(var(--p) * .6% + 8%),hsl(var(--h) 80% 97%/.8) 0 1.5px,transparent 2.5px),radial-gradient(circle at calc(var(--q) * .8% + 10%) calc(100% - var(--p) * .5% - 6%),hsl(var(--h) 80% 97%/.7) 0 1.5px,transparent 2.5px),linear-gradient(calc(120deg + var(--p) * .6deg),hsl(var(--h) 62% 94%),hsl(calc(var(--h) + 24) 55% 84%));box-shadow:inset 0 0 0 1px hsl(var(--h) 40% 40%/.14)}.lrn-cover svg{position:absolute;inset:0;width:100%;height:100%;transform:translate(calc((var(--p) - 50) * .08%),calc((var(--q) - 50) * .08%)) scale(1.04)}.lrn-s{fill:none;stroke:var(--lrn-ink);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.lrn-hair{stroke-opacity:.22;stroke-width:1}.lrn-bold{stroke-width:2.8}.lrn-f{fill:var(--lrn-ink)}.lrn-t{fill:var(--lrn-tint)}.lrn-ring{stroke:var(--lrn-ink);stroke-width:2}.lrn-cover--lg{border-radius:18px}.lrn-cards{list-style:none;margin:0;padding:0;display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(min(100%,230px),1fr))}.lrn-card{margin:0}.lrn-card__link{display:flex;flex-direction:column;gap:10px;height:100%;padding:10px 10px 14px;background:var(--card);border:1px solid var(--hair);border-radius:var(--lrn-radius);color:var(--ink-deep);text-decoration:none}.lrn-card__link:hover{border-color:var(--ink-soft)}.lrn-card__body{display:flex;flex-direction:column;gap:4px;padding-inline:4px}.lrn-card__kicker{font:500 11.5px/1.3 var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--ink-soft)}.lrn-card__title{font:400 18px/1.28 var(--serif);letter-spacing:-.01em;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}@media (prefers-reduced-motion:no-preference){.lrn-card__link{transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease}.lrn-card__link:hover{transform:translateY(-2px);box-shadow:0 10px 24px -14px color-mix(in oklch,var(--ink-deep) 40%,transparent)}}.lrn-section{margin-top:48px}.lrn-section__head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:18px}.lrn-section__title{font-size:clamp(24px,3vw,32px);line-height:1.12}.lrn-section__sub{margin:4px 0 0;font:400 15px/1.5 var(--sans);color:var(--ink-soft);max-width:60ch}.lrn-link-more{font:500 14px/1 var(--sans);color:var(--accent-deep);min-height:44px;display:inline-flex;align-items:center}.lrn-hero{display:grid;gap:28px;align-items:center;padding-bottom:8px}.lrn-hero__eyebrow{font:500 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--accent-deep);margin:0 0 14px}.lrn-hero__title{font-size:clamp(38px,7vw,68px);line-height:1.02;letter-spacing:-.022em;display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.lrn-hero__rss{color:var(--ink-soft);line-height:0;flex-shrink:0;min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center}.lrn-hero__sub{margin:16px 0 0;font:400 clamp(17px,2vw,20px)/1.55 var(--serif);color:var(--ink-soft);max-width:58ch}.lrn-hero__sub a,.lrn-prose-link{color:var(--accent-deep);text-underline-offset:3px}.lrn-hero__count{margin:18px 0 0;font:500 14px/1.4 var(--sans);color:var(--ink)}.lrn-hero__count strong{font-family:var(--serif);font-size:1.5em;font-weight:600;color:var(--ink-deep)}.lrn-hero__art{display:none}@media (min-width:860px){.lrn-hero{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:48px}.lrn-hero__art{display:grid;grid-template-columns:1fr 1fr;gap:14px}.lrn-hero__art .lrn-cover:first-child{transform:rotate(-3deg)}.lrn-hero__art .lrn-cover:nth-child(2){transform:translateY(18px) rotate(2deg)}.lrn-hero__art .lrn-cover:nth-child(3){transform:translateY(-6px) rotate(2deg)}.lrn-hero__art .lrn-cover:nth-child(4){transform:translateY(10px) rotate(-2deg)}}.lrn-page .blog-filter{margin-top:28px}.lrn-stage{display:grid;gap:12px;grid-template-columns:1fr;margin:0;padding:0;list-style:none}.lrn-stage__item{background:var(--card);border-radius:var(--lrn-radius);padding:16px 18px;display:flex;flex-direction:column;gap:2px;border:1px solid var(--hair);border-left:5px solid var(--accent)}.lrn-stage__item--gcse{border-left-color:hsl(222 55% 42%)}.lrn-stage__item--both{border-left-color:hsl(38 75% 46%)}.lrn-stage__num{font:600 30px/1.1 var(--serif);color:var(--ink-deep)}.lrn-stage__label{font:500 15px/1.35 var(--sans);color:var(--ink)}.lrn-stage__years{font:400 13px/1.4 var(--sans);color:var(--ink-soft)}@media (min-width:640px){.lrn-stage{grid-template-columns:repeat(3,1fr)}}.lrn-clusters{list-style:none;margin:0;padding:0;display:grid;gap:18px;grid-template-columns:1fr}@media (min-width:640px){.lrn-clusters{grid-template-columns:repeat(2,1fr)}}@media (min-width:1000px){.lrn-clusters{grid-template-columns:repeat(3,1fr)}}.lrn-cluster{background:var(--card);border:1px solid var(--hair);border-radius:var(--lrn-radius);padding:10px 10px 16px;display:flex;flex-direction:column;gap:12px}.lrn-cluster__cover{text-decoration:none;display:block}.lrn-cluster__head{padding-inline:6px}.lrn-cluster__title{font-size:24px;line-height:1.15}.lrn-cluster__title a{color:var(--ink-deep);text-decoration:none;display:inline-block;min-height:44px;padding-top:6px}.lrn-cluster__title a:hover{text-decoration:underline;text-underline-offset:4px}.lrn-cluster__count{margin:0;font:500 12px/1.3 var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--ink-soft)}.lrn-cluster__list{list-style:none;margin:0;padding:0 6px;display:flex;flex-direction:column}.lrn-cluster__list a{display:block;padding:9px 0;min-height:44px;font:400 15px/1.35 var(--sans);color:var(--ink);text-decoration:none;border-top:1px solid var(--hair)}.lrn-cluster__list li:first-child a{border-top:0}.lrn-cluster__list a:hover{color:var(--accent-deep);text-decoration:underline;text-underline-offset:3px}.lrn-cluster__all{padding:0 6px;margin-top:auto;font:500 14px/1 var(--sans)}.lrn-cluster__all a{color:var(--accent-deep);display:inline-flex;align-items:center;min-height:44px}.lrn-chips{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}.lrn-chip{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 16px;background:var(--card);border:1px solid var(--hair-strong);border-radius:999px;font:500 14px/1 var(--sans);color:var(--ink);text-decoration:none}a.lrn-chip:hover{border-color:var(--ink-deep);color:var(--ink-deep)}.lrn-chip__n{font:500 12px/1 var(--mono);color:var(--ink-soft)}.lrn-chip--static{min-height:36px;padding:0 13px;background:var(--paper-2);border-color:var(--hair)}.lrn-crumbs{margin-bottom:18px}.lrn-chero{display:grid;gap:22px;align-items:center}.lrn-chero__title{font-size:clamp(36px,6vw,60px);line-height:1.04;letter-spacing:-.02em}.lrn-chero__sub{margin:14px 0 0;font:400 clamp(16px,1.8vw,19px)/1.55 var(--serif);color:var(--ink-soft);max-width:56ch}.lrn-chero__count{margin:12px 0 0;font:500 12px/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-soft)}@media (min-width:760px){.lrn-chero{grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:44px}}.lrn-group{margin-top:40px;scroll-margin-top:90px}.lrn-group__title{font-size:clamp(24px,3vw,30px);line-height:1.15;padding-bottom:10px;border-bottom:1px solid var(--hair);display:flex;align-items:baseline;gap:10px}.lrn-group__n{font:500 13px/1 var(--mono);color:var(--ink-soft)}.lrn-list{list-style:none;margin:0;padding:0}.lrn-list li{padding:14px 0;border-bottom:1px solid var(--hair)}.lrn-list a{font:600 17px/1.35 var(--sans);color:var(--ink-deep);text-decoration:none;display:inline-block}.lrn-list a:hover{color:var(--accent-deep);text-decoration:underline;text-underline-offset:3px}.lrn-list p{margin:4px 0 0;font:400 15px/1.5 var(--sans);color:var(--ink-soft);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;max-width:78ch}@media (min-width:900px){.lrn-list{column-count:2;column-gap:40px}.lrn-list li{break-inside:avoid}}.lrn-ahero{display:grid;gap:22px;padding-bottom:8px}.lrn-ahero__kicker{font:500 12px/1.3 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--accent-deep);margin:0 0 12px}.lrn-ahero__title{font-size:clamp(32px,5.2vw,52px);line-height:1.07;letter-spacing:-.02em;text-wrap:balance}.lrn-ahero__dek{margin:16px 0 0;font:400 clamp(17px,2vw,20px)/1.55 var(--serif);color:var(--ink-soft);max-width:60ch}.lrn-meta{margin:18px 0 0;display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;font:400 14px/1.5 var(--sans);color:var(--ink-soft)}.lrn-meta a{color:var(--ink-deep);text-underline-offset:3px}.lrn-meta__dot{color:var(--quiet)}.lrn-tags{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px}@media (min-width:880px){.lrn-ahero{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:48px;align-items:center}}.lrn-alayout{display:grid;gap:28px;margin-top:28px}.lrn-aside-toc{display:none}.lrn-toc-m{border:1px solid var(--hair);border-radius:var(--lrn-radius);background:var(--card)}.lrn-toc-m summary{list-style:none;cursor:pointer;padding:0 18px;min-height:48px;display:flex;align-items:center;justify-content:space-between;font:600 14px/1 var(--sans);color:var(--ink-deep)}.lrn-toc-m summary::-webkit-details-marker{display:none}.lrn-toc-m summary:after{content:"+";font:400 22px/1 var(--mono);color:var(--ink-soft)}.lrn-toc-m[open] summary:after{content:"–"}.lrn-toc-m .lrn-toc{padding:0 18px 12px}.lrn-toc{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}.lrn-toc a{display:block;min-height:44px;font:400 14.5px/1.35 var(--sans);color:var(--ink-soft);text-decoration:none;border-left:2px solid transparent;padding:8px 0 8px 12px}.lrn-toc a:hover{color:var(--ink-deep);border-left-color:var(--accent)}.lrn-toc li[data-depth="3"] a{padding-left:26px;font-size:13.5px}.lrn-toc__title{font:500 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 8px}@media (min-width:1080px){.lrn-alayout{grid-template-columns:236px minmax(0,1fr);gap:56px;align-items:start}.lrn-toc-m{display:none}.lrn-aside-toc{display:block;position:sticky;top:96px;max-height:calc(100vh - 120px);overflow-y:auto;padding-right:8px}.lrn-toc a{min-height:0;padding-block:6px}}.lrn-main{min-width:0;max-width:72ch}.lrn-glance{background:var(--card);border:1px solid var(--hair);border-radius:var(--lrn-radius);padding:18px 20px;margin:0 0 24px}.lrn-glance__title{font:500 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 12px}.lrn-glance dl{margin:0;display:grid;grid-template-columns:1fr 1fr;gap:14px 18px}.lrn-glance dt{font:500 12px/1.2 var(--mono);letter-spacing:.04em;text-transform:uppercase;color:var(--ink-soft)}.lrn-glance dd{margin:3px 0 0;font:500 15px/1.35 var(--sans);color:var(--ink-deep)}@media (min-width:640px){.lrn-glance dl{grid-template-columns:repeat(3,1fr)}}.lrn-lede{border-left:4px solid var(--accent);background:var(--accent-soft);background:color-mix(in oklch,var(--accent-soft) 55%,var(--paper));border-radius:0 var(--lrn-radius) var(--lrn-radius) 0;padding:16px 20px 18px;margin:0 0 28px}.lrn-lede__label{font:600 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--accent-deep);margin:0 0 8px}.lrn-lede p{margin:0;font:400 clamp(19px,2.2vw,22px)/1.5 var(--serif);color:var(--ink-deep)}.lrn-fig{margin:0 0 24px;padding:18px 20px;background:var(--card);border:1px solid var(--hair);border-radius:var(--lrn-radius)}.lrn-fig__title{font:500 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 14px}.lrn-fig figcaption{margin-top:12px;font:400 13.5px/1.5 var(--sans);color:var(--ink-soft)}.lrn-ladder{list-style:none;margin:0;padding:0;display:grid;gap:10px;grid-template-columns:1fr}.lrn-ladder__step{position:relative;padding:12px 16px;border:2px solid var(--hair-strong);border-radius:12px;background:var(--paper);display:flex;flex-direction:column;gap:2px}.lrn-ladder__step[aria-current=true]{border-color:var(--accent-deep);background:var(--accent-soft);background:color-mix(in oklch,var(--accent-soft) 70%,var(--paper))}.lrn-ladder__name{font:600 16px/1.2 var(--sans);color:var(--ink-deep)}.lrn-ladder__years{font:400 13px/1.3 var(--sans);color:var(--ink-soft)}.lrn-ladder__here{font:600 11px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--accent-deep);margin-top:4px}@media (min-width:560px){.lrn-ladder{grid-template-columns:1fr 28px 1fr;align-items:stretch}.lrn-ladder__arrow{display:flex;align-items:center;justify-content:center;color:var(--quiet);font-size:22px}}.lrn-ladder__arrow{display:none}@media (min-width:560px){.lrn-ladder__arrow{display:flex}}.lrn-steps{list-style:none;margin:0;padding:0;display:grid;gap:0;counter-reset:lrnstep}.lrn-steps li{position:relative;counter-increment:lrnstep;padding:0 0 16px 48px;font:500 15px/1.4 var(--sans);color:var(--ink-deep);min-height:36px}.lrn-steps li:before{content:counter(lrnstep);position:absolute;left:0;top:-2px;width:32px;height:32px;border-radius:50%;background:var(--ink-deep);color:var(--ink-on-dark);display:grid;place-items:center;font:600 14px/1 var(--mono)}.lrn-steps li:after{content:"";position:absolute;left:15px;top:32px;bottom:2px;width:2px;background:var(--hair-strong)}.lrn-steps li:last-child{padding-bottom:0}.lrn-steps li:last-child:after{display:none}@media (min-width:720px){.lrn-steps{grid-template-columns:repeat(4,1fr);gap:20px 14px}.lrn-steps li{padding:44px 0 0}.lrn-steps li:before{top:0}.lrn-steps li:after{left:36px;top:15px;bottom:auto;right:-14px;width:auto;height:2px}.lrn-steps li:last-child:after,.lrn-steps li:nth-child(4n):after{display:none}}.lrn-prose{font-family:var(--serif);font-size:clamp(17px,1.1vw + 14px,18.5px);line-height:1.7;color:var(--ink);overflow-wrap:break-word}.lrn-prose h2{scroll-margin-top:90px;font-size:clamp(25px,3vw,32px);margin-top:2.2em}.lrn-prose h3{scroll-margin-top:90px;font-size:clamp(20px,2.2vw,24px);margin-top:1.8em}.lrn-prose h2:first-child{margin-top:.4em}.lrn-prose .heading-anchor{display:block}.lrn-prose .heading-anchor:focus-visible:after,.lrn-prose .heading-anchor:hover:after{content:" #";color:var(--accent-deep);font-family:var(--mono);font-size:.7em}.lrn-prose ol,.lrn-prose ul{padding-left:1.4em}.lrn-prose li{padding-left:.2em}.lrn-prose li>ol,.lrn-prose li>ul{margin-top:.4em}.lrn-prose blockquote{margin-inline:0;padding:.4em 1.1em;border-left:4px solid var(--gilt);background:var(--paper-2);border-radius:0 10px 10px 0;color:var(--ink);font-style:italic}.lrn-prose code{background:var(--paper-2);padding:.1em .35em;border-radius:5px;font-size:.88em;overflow-wrap:anywhere}.lrn-prose pre{overflow-x:auto;background:var(--ink-deep);color:var(--ink-on-dark);border-radius:12px;padding:16px 18px;line-height:1.55}.lrn-prose pre code{background:none;padding:0;color:inherit}.lrn-prose a{color:var(--accent-deep);text-underline-offset:3px}.lrn-prose img{max-width:100%;height:auto}.lrn-tablewrap{overflow-x:auto;max-width:100%;margin-block:1.4em;border:1px solid var(--hair);border-radius:12px;background:linear-gradient(to right,var(--card) 30%,transparent) 0 /28px 100% no-repeat local,linear-gradient(to left,var(--card) 30%,transparent) 100% /28px 100% no-repeat local,linear-gradient(to right,hsl(215 30% 30%/.18),transparent) 0 /10px 100% no-repeat scroll,linear-gradient(to left,hsl(215 30% 30%/.18),transparent) 100% /10px 100% no-repeat scroll,var(--card);-webkit-overflow-scrolling:touch}.lrn-prose table{width:100%;min-width:480px;border-collapse:separate;border-spacing:0;font-family:var(--sans);font-size:15px;line-height:1.45}.lrn-prose td,.lrn-prose th{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--hair)}.lrn-prose th{position:sticky;top:0;background:var(--paper-2);color:var(--ink-deep);font:600 12px/1.3 var(--mono);letter-spacing:.04em;text-transform:uppercase}.lrn-prose tbody tr:nth-child(2n) td{background:color-mix(in oklch,var(--paper-2) 55%,transparent)}.lrn-prose tbody tr:last-child td{border-bottom:0}.lrn-terms{margin:36px 0 0}.lrn-sources{margin-top:44px;padding-top:24px;border-top:1px solid var(--hair)}.lrn-related h2,.lrn-sources h2{font-size:22px;margin-bottom:12px}.lrn-sources ul{margin:0;padding-left:1.2em;font:400 15px/1.6 var(--sans)}.lrn-sources a{color:var(--accent-deep);text-underline-offset:3px;overflow-wrap:anywhere}.lrn-related{margin-top:52px}.lrn-related__all{margin:16px 0 0}.lrn-related__all a{color:var(--accent-deep);font:500 15px/1 var(--sans);display:inline-flex;align-items:center;min-height:44px}.lrn-cta{margin-top:44px;padding:24px 24px 26px;border-radius:18px;background:var(--ink-deep);color:var(--ink-on-dark);display:grid;gap:10px}.lrn-cta__kicker{font:500 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-on-dark-2);margin:0}.lrn-cta__text{margin:0;font:400 clamp(18px,2vw,21px)/1.5 var(--serif);color:var(--ink-on-dark)}.lrn-cta__text a{color:var(--ink-on-dark);text-underline-offset:3px}.lrn-cta__btn{justify-self:start;display:inline-flex;align-items:center;min-height:44px;padding:0 20px;border-radius:999px;background:var(--ink-on-dark);color:var(--ink-deep);font:600 15px/1 var(--sans);text-decoration:none}.lrn-cta__btn:hover{background:#fff}.lrn-cta a:focus-visible{outline-color:#fff}.lrn-prose>*+*{margin-top:1.1em}.lrn-prose p{margin:0}.lrn-prose strong{color:var(--ink-deep);font-weight:600}.lrn-prose h2{padding-bottom:.4em;border-bottom:1px solid var(--hair);line-height:1.2}.lrn-prose h3{line-height:1.25}.lrn-prose li+li{margin-top:.4em}.lrn-prose li>p{margin:0}.lrn-prose ul li::marker{color:var(--accent)}.lrn-prose ol li::marker{color:var(--ink-soft);font-family:var(--mono)}.lrn-prose hr{border:0;border-top:1px solid var(--hair);margin-block:2em}.lrn-prose .heading-anchor{color:inherit;text-decoration:none}.lrn-terms h2{font-size:22px;margin-bottom:12px}@media (max-width:759px){.lrn-ahero .lrn-cover,.lrn-chero .lrn-cover{aspect-ratio:16/7}}