.lrn{--lrn-bar-h:0px;padding:0 0 72px}.lrn :is(a,summary,button,[tabindex="0"]):focus-visible{outline:1px solid var(--focus);box-shadow:var(--focus-ring);outline-offset:2px;border-radius:4px}.lrn [id]{scroll-margin-top:calc(var(--topbar-h) + var(--lrn-bar-h) + 20px)}@media (prefers-reduced-motion:reduce){html:has(.lrn){scroll-behavior:auto}}.lrn-bar{position:-webkit-sticky;position:sticky;top:var(--topbar-h);z-index:20}.lrn-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--data);transform-origin:0 50%;transform:scaleX(0);display:none;pointer-events:none}@supports (animation-timeline:scroll()){.lrn-progress{display:block;animation:lrn-progress linear both;animation-timeline:scroll(root block)}}@keyframes lrn-progress{to{transform:scaleX(1)}}.lrn-toc-m{position:relative;background:hsla(0,0%,100%,.94);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--rule)}.lrn-toc-m summary{list-style:none;display:flex;align-items:center;gap:10px;min-height:48px;padding:0 44px 0 16px;cursor:pointer;position:relative}.lrn-toc-m summary::-webkit-details-marker{display:none}.lrn-toc-m summary:after{content:"";position:absolute;right:20px;top:50%;width:8px;height:8px;border-right:1.5px solid var(--ink);border-bottom:1.5px solid var(--ink);transform:translateY(-70%) rotate(45deg)}.lrn-toc-m[open] summary:after{transform:translateY(-20%) rotate(225deg)}.lrn-toc-m-k{flex:none;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.lrn-toc-m-v{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:600;color:var(--ink)}.lrn-toc-m-panel{position:absolute;left:0;right:0;top:100%;max-height:min(70vh,520px);overflow-y:auto;overscroll-behavior:contain;background:#fff;border-bottom:1px solid var(--rule);box-shadow:0 18px 30px -18px rgba(2,7,10,.35);padding:8px 8px 12px}.lrn-shell{display:block;max-width:760px;margin:0 auto}.lrn-aside{display:none}@media (min-width:1200px){.lrn-toc-m{display:none}.lrn-shell{display:grid;grid-template-columns:minmax(0,760px) 220px;grid-gap:48px;gap:48px;justify-content:center;max-width:1100px;padding:32px 32px 0}.lrn-aside{display:block}.lrn-toc{position:-webkit-sticky;position:sticky;top:calc(var(--topbar-h) + 32px);max-height:calc(100vh - var(--topbar-h) - 64px);overflow-y:auto;padding:4px 0}}.lrn-toc-h{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 0 10px 12px}.lrn-toc-list{list-style:none;margin:0;padding:0}.lrn-toc-list a{display:flex;gap:10px;align-items:baseline;min-height:40px;padding:9px 12px;border-left:2px solid var(--rule);font-size:14px;line-height:1.35;color:var(--muted);transition:color .15s ease,border-color .15s ease,background-color .15s ease}.lrn-toc-list a:hover{color:var(--ink);background:rgba(2,7,10,.03)}.lrn-toc-list a[aria-current]{color:var(--ink);font-weight:600;border-left-color:var(--data);background:var(--data-tint)}.lrn-toc-n{flex:none;width:1.4em;font-family:var(--font-mono);font-size:11.5px;color:var(--muted);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.lrn-toc-list a[aria-current] .lrn-toc-n{color:var(--data-light)}.lrn-top{display:inline-flex;align-items:center;min-height:40px;margin:10px 0 0 12px;font-size:13px;font-weight:500;color:var(--link-light)}.lrn-top:before{content:"\2191";margin-right:6px}.lrn-top:hover{text-decoration:underline}.lrn-article{min-width:0;background:#fff;padding:24px 16px 40px;color:var(--ink)}@media (min-width:700px){.lrn-article{margin-top:24px;padding:40px 56px 48px;border:1px solid var(--rule);border-radius:16px;box-shadow:0 1px 2px rgba(2,7,10,.04),0 24px 48px -40px rgba(2,7,10,.4)}}@media (min-width:1200px){.lrn-article{margin-top:0}}.lrn-crumbs ol{list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:4px;margin:-8px 0 8px;padding:0;font-size:13px;color:var(--muted)}.lrn-crumbs li+li:before{content:"/";margin-right:4px;color:#a3aeb6}.lrn-crumbs a{color:var(--muted);display:inline-flex;min-height:40px;align-items:center}.lrn-crumbs a:hover{color:var(--link-light);text-decoration:underline}.lrn-crumbs [aria-current]{color:var(--ink);font-weight:500}.lrn-head h1{font-size:clamp(1.75rem,4.2vw,2.5rem);line-height:1.12;letter-spacing:-.03em;color:var(--ink);text-wrap:balance;margin:0 0 14px}.lrn-lede{font-size:1.12rem;line-height:1.6;color:var(--muted);max-width:62ch;text-wrap:pretty;margin:0 0 24px}.lrn-facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:1px;gap:1px;margin:0 0 8px;background:var(--rule);border:1px solid var(--rule);border-radius:10px;overflow:hidden}.lrn-facts div{background:var(--paper);padding:12px 14px;min-width:0}.lrn-facts dt{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);margin:0 0 2px}.lrn-facts dd{margin:0;font-size:14px;font-weight:500;line-height:1.4;color:var(--ink)}@media (max-width:640px){.lrn-facts{grid-template-columns:1fr}.lrn-facts div{display:flex;gap:12px;align-items:baseline;padding:10px 14px}.lrn-facts dt{flex:none;width:88px;margin:0}}.lrn-sec{padding-top:8px}.lrn-sec h2{font-size:clamp(1.3rem,2.6vw,1.6rem);line-height:1.25;letter-spacing:-.02em;color:var(--ink);text-wrap:balance;margin:40px 0 14px}.lrn-note p,.lrn-sec>p{font-size:1.06rem;line-height:1.75;color:#26313a;max-width:68ch;text-wrap:pretty;margin:0 0 18px}.lrn-sec a{color:var(--link-light);text-decoration:underline;-webkit-text-decoration-color:rgba(2,112,166,.35);text-decoration-color:rgba(2,112,166,.35);text-underline-offset:3px}.lrn-sec a:hover{-webkit-text-decoration-color:currentColor;text-decoration-color:currentColor}.lrn-callout{margin:28px 0 8px;padding:20px 22px;background:var(--paper);border:1px solid var(--rule);border-radius:12px}.lrn-callout h3{font-size:15px;letter-spacing:-.01em;color:var(--ink);margin:0 0 12px}.lrn-terms{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:14px 24px;gap:14px 24px;margin:0 0 12px}.lrn-terms dt{font-weight:600;font-size:14.5px;color:var(--ink);margin:0 0 2px}.lrn-terms dd{margin:0;font-size:14px;line-height:1.55;color:var(--muted)}.lrn-callout .lrn-terms a{color:var(--ink);-webkit-text-decoration-color:rgba(2,151,222,.5);text-decoration-color:rgba(2,151,222,.5)}.lrn-callout .lrn-terms a:hover{color:var(--link-light)}.lrn-callout>p{font-size:14px;margin:0;color:var(--muted)}@media (max-width:640px){.lrn-terms{grid-template-columns:1fr}}.lrn-note{margin:8px 0 18px;padding:14px 18px;border-left:3px solid var(--data);background:var(--data-tint);border-radius:0 10px 10px 0}.lrn-note p{margin:0;font-size:1rem;color:var(--ink)}.lrn-fig{margin:24px 0 18px;border:1px solid var(--rule);border-radius:12px;background:#fff;overflow-x:auto;overscroll-behavior-x:contain}.lrn .lrn-fig .guide-svg{min-width:600px;margin:0;border:0;border-radius:0;padding:12px}.lrn-ex{margin:22px 0 24px;border:1px solid var(--rule);border-radius:12px;overflow:hidden;background:#fff}.lrn-ex figcaption{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;padding:12px 16px;background:var(--ink);color:#fff}.lrn-ex-k{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--link-dark)}.lrn-ex-t{font-size:14.5px;font-weight:600}.lrn-scroll{overflow-x:auto;overscroll-behavior-x:contain}.lrn .lrn-ex .je-table{margin:0;min-width:560px;font-size:14px}.lrn .lrn-ex .je-table th{background:var(--paper);color:var(--muted);font-size:12px;font-weight:500;font-family:var(--font-mono);letter-spacing:.02em;border-bottom:1px solid var(--rule);padding:9px 14px}.lrn .lrn-ex .je-table td{padding:9px 14px;border-bottom:1px solid #eef1f3}.lrn .lrn-ex .je-table tbody tr:nth-child(odd) td{background:transparent}.lrn .lrn-ex .je-table tr.je-gap td{border-top:1px solid var(--rule)}.lrn .lrn-ex .je-table td[rowspan]{font-weight:600;color:var(--ink);width:34%}.lrn .lrn-ex .je-table td.num{font-family:var(--font-mono);font-size:13.5px;white-space:nowrap}.lrn-result{margin:0;padding:14px 16px 16px;border-top:1px solid var(--rule);background:var(--data-tint);font-size:14.5px;line-height:1.65;color:var(--ink)}.lrn-links{list-style:none;padding:0;margin:8px 0 0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:10px;gap:10px}.lrn-links li{padding:14px 16px;border:1px solid var(--rule);border-radius:12px;font-size:14.5px;line-height:1.5;color:var(--muted);transition:border-color .15s ease}.lrn-links li:hover{border-color:var(--data)}.lrn .lrn-links a{font-weight:600;color:var(--ink);text-decoration:none}.lrn .lrn-links a:hover{color:var(--link-light);text-decoration:underline}@media (max-width:640px){.lrn-links{grid-template-columns:1fr}}.lrn-disclaimer{margin:40px 0 0;padding-top:20px;border-top:1px solid var(--rule);font-size:13px;line-height:1.6;color:var(--muted);max-width:68ch}@media (max-width:1199px){.lrn{--lrn-bar-h:49px}}@media (max-width:699px){.lrn-note p,.lrn-sec>p{font-size:1rem;line-height:1.7}}