.ind.lrn{--lrn-accent:#4a6fd6;--lrn-accent-text:#3a5cbe;--lrn-rule:var(--line);--lrn-rule-lead:color-mix(in srgb, var(--ink) 22%, transparent);--lrn-field-line:#8f887c;--lrn-rim:#16150f1c;--lrn-plate-bg:var(--raised,#f2f1ec);--lrn-pill:62px;--lrn-top:calc(var(--banner-h,0px) + 14px + var(--lrn-pill));--lrn-anchor:calc(var(--lrn-top) + 58px);--lrn-measure:840px;--lrn-plate:88px;--lrn-noCol:22px;--lrn-gutter:12px;--lrn-tickCol:16px;--lrn-rowPad:12px;--lrn-ease:cubic-bezier(.2, .7, .2, 1)}@media (min-width:560px){.ind.lrn{--lrn-plate:100px;--lrn-noCol:26px;--lrn-gutter:16px;--lrn-tickCol:18px;--lrn-rowPad:14px}}@media (min-width:720px){.ind.lrn{--lrn-plate:112px;--lrn-noCol:28px;--lrn-gutter:20px;--lrn-tickCol:20px;--lrn-rowPad:16px}}@media (min-width:861px){.ind.lrn{--lrn-anchor:calc(var(--lrn-top) + 20px)}}@media (min-width:1024px){.ind.lrn{--lrn-plate:124px;--lrn-gutter:22px;--lrn-tickCol:22px}}.ind.ind--light.lrn .sec__kicker{color:var(--lrn-accent-text);letter-spacing:.14em}.ind.ind--light.lrn :is(input,button,a):focus-visible{outline:2px solid var(--lrn-accent);outline-offset:3px}.ind.ind--light.lrn ::selection{background:color-mix(in srgb, var(--lrn-accent) 22%, transparent);color:var(--ink)}.ind.lrn .lrn__srOnly{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.ind.lrn .lrn__hero{padding:calc(var(--lrn-top) + 40px) 0 8px}.ind.lrn .lrn__eyebrow{color:var(--muted);margin:0;display:block}.ind.lrn .lrn__h1{letter-spacing:-.032em;max-width:13ch;color:var(--ink);margin:18px 0 0;font-size:clamp(2.4rem,4.4vw,3.5rem);line-height:.98}.ind.lrn .lrn__toc{max-width:var(--lrn-measure);border-top:1px solid var(--lrn-rule);margin:32px 0 0;display:block}.ind.lrn a.lrn__tocRow{border-bottom:1px solid var(--lrn-rule);color:var(--ink);grid-template-columns:14px 3.4ch minmax(0,1fr) auto;align-items:center;column-gap:16px;padding:14px 0;display:grid}.ind.lrn .lrn__tocDot{border:1.5px solid var(--faint);background:0 0;border-radius:50%;width:11px;height:11px}.ind.lrn [data-state=part] .lrn__tocDot{border-color:var(--lrn-accent);background:linear-gradient(90deg, var(--lrn-accent) 50%, transparent 50%)}.ind.lrn [data-state=done] .lrn__tocDot{border-color:var(--lrn-accent);background:var(--lrn-accent)}.ind.lrn .lrn__tocN{letter-spacing:.06em;color:var(--lrn-accent-text);font-variant-numeric:tabular-nums;font-size:.78rem}.ind.lrn .lrn__tocT{letter-spacing:-.012em;font-size:clamp(1.05rem,1.5vw,1.22rem);font-weight:600}.ind.lrn .lrn__tocC{color:var(--faint);white-space:nowrap;font-variant-numeric:tabular-nums;font-size:.7rem}.ind.lrn .lrn__tocC.is-done{color:var(--lrn-accent-text)}.ind.lrn a.lrn__tocRow:hover .lrn__tocT{text-underline-offset:3px;text-decoration:underline;-webkit-text-decoration-color:color-mix(in srgb, var(--lrn-accent) 55%, transparent);text-decoration-color:color-mix(in srgb, var(--lrn-accent) 55%, 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6px);z-index:20;scrollbar-width:none;overscroll-behavior-x:contain;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-block:1px solid var(--lrn-rule);background:#ffffffeb;align-items:center;height:40px;margin:20px 0 0;padding:6px 20px;display:flex;position:sticky;overflow-x:auto}.ind.lrn .lrn__folio::-webkit-scrollbar{display:none}.ind.lrn a.lrn__folioA{color:var(--muted);white-space:nowrap;flex:none;padding:6px 12px;font-size:.82rem}.ind.lrn a.lrn__folioA[aria-current]{color:var(--ink);box-shadow:inset 0 -2px 0 var(--lrn-accent)}.ind.lrn .lrn__folioN{color:var(--lrn-accent-text);margin-right:6px;font-size:.66rem}}.ind.lrn .lrn__optinSec{margin-block:26px 0}.ind.lrn .lrn__optin{border:0;border-block:1px solid var(--lrn-rule);background:0 0;border-radius:0;grid-template-columns:minmax(0,1fr);align-items:center;gap:14px;padding:18px 0;display:grid}@media (min-width:820px){.ind.lrn .lrn__optin{grid-template-columns:minmax(0,1fr) minmax(360px,460px);gap:12px 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.lrn__no{letter-spacing:.02em;font-variant-numeric:tabular-nums;color:var(--ink);grid-area:no;justify-self:start;font-size:.82rem}.ind.lrn .lrn__seen{color:var(--lrn-accent-text);grid-area:tick;justify-self:end;font-size:.82rem}.ind.lrn h3.lrn__title{font-family:var(--ui);letter-spacing:-.006em;color:var(--ink);text-wrap:pretty;grid-area:title;max-width:54ch;margin:0;font-size:clamp(.95rem,1.1vw,1.02rem);font-weight:600;line-height:1.38}.ind.lrn button.lrn__face{font:inherit;color:inherit;letter-spacing:inherit;text-align:left;cursor:pointer;background:0 0;border:0;margin:0;padding:0;display:inline}.ind.lrn button.lrn__face:after{content:"";border-radius:8px;position:absolute;inset:0}.ind.lrn .lrn__card:is(:target,.is-active):before{content:"";left:-14px;top:var(--lrn-rowPad);bottom:var(--lrn-rowPad);background:var(--lrn-accent);width:2px;position:absolute}.ind.lrn .lrn__media{background:var(--lrn-plate-bg);height:var(--lrn-plate);width:calc(var(--lrn-plate) * 9 / 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