@font-face{font-family:Barlow Condensed;src:url(/fonts/barlow-condensed-500.woff2)format("woff2");font-weight:500;font-style:normal;font-display:swap}@font-face{font-family:Barlow Condensed;src:url(/fonts/barlow-condensed-600.woff2)format("woff2");font-weight:600;font-style:normal;font-display:swap}@font-face{font-family:"Source Sans 3";src:url(/fonts/source-sans-3-400-700.woff2)format("woff2");font-weight:400 700;font-style:normal;font-display:swap}@font-face{font-family:Source Sans Fallback;src:local(Arial),local(ArialMT),local(Liberation Sans);font-weight:400 500;size-adjust:93%;ascent-override:110.108%;descent-override:43.0108%;line-gap-override:0%}@font-face{font-family:Source Sans Fallback;src:local(Arial Bold),local(Arial-BoldMT),local(Liberation Sans Bold);font-weight:600 700;size-adjust:93%;ascent-override:110.108%;descent-override:43.0108%;line-gap-override:0%}@font-face{font-family:Source Sans Caps Fallback;src:local(Arial Bold),local(Arial-BoldMT),local(Liberation Sans Bold);font-weight:600 700;size-adjust:85%;ascent-override:120.471%;descent-override:47.0588%;line-gap-override:0%}:root{--paper:#fff;--paper-2:#f3f4f2;--ink:#202420;--ink-2:#595e59;--hair:#11131529;--night:#171c19;--night-2:#222a24;--night-hair:#ede7dc29;--chalk:#f5f5ef;--chalk-2:#b6bcb4;--flight:#72502d;--airspace:#435951;--ground:#676960;--landing:#455b49;--flight-on-dark:#dec698;--airspace-on-dark:#adc3bc;--ground-on-dark:#c7c2b2;--landing-on-dark:#b2c5ac;--sans:"Source Sans 3", "Source Sans Fallback", "Segoe UI", Arial, sans-serif;--display:"Barlow Condensed", "Arial Narrow", var(--sans);--fs-title:clamp(2.75rem, 1.8rem + 3.2vw, 4.75rem);--fs-h2:clamp(2rem, 1.4rem + 1.8vw, 3rem);--fs-h3:clamp(1.1875rem, 1.12rem + .3vw, 1.375rem);--fs-lead:clamp(1.1875rem, 1.08rem + .45vw, 1.4375rem);--fs-body:clamp(1.0625rem, 1.03rem + .15vw, 1.125rem);--fs-ui:1rem;--fs-small:.9375rem;--fs-note:.875rem;--fs-caps:.75rem;--gutter:clamp(1.25rem, .3rem + 4vw, 4.5rem);--max:82rem;--measure:65ch}*,:before,:after{box-sizing:border-box}[hidden]{display:none!important}html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:5rem}body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:var(--fs-body);font-synthesis:none;font-kerning:normal;-webkit-font-smoothing:antialiased;margin:0;line-height:1.62}img,svg{max-width:100%;height:auto;display:block}h1,h2,h3,h4{letter-spacing:-.015em;text-wrap:balance;margin:0;font-weight:500;line-height:1.06}h1{font-family:var(--display);font-size:var(--fs-title);letter-spacing:-.015em;text-transform:none;overflow-wrap:anywhere;font-weight:500;line-height:1.02}h2{font-family:var(--display);font-size:var(--fs-h2)}h3{font-family:var(--sans);font-size:var(--fs-h3);letter-spacing:-.01em;font-weight:600;line-height:1.2}p{text-wrap:pretty;margin:0 0 1em}p:last-child{margin-bottom:0}a{color:inherit;text-decoration-line:underline;text-decoration-color:var(--flight);text-underline-offset:.2em;text-decoration-thickness:1px}a:hover{text-decoration-thickness:2px}:focus-visible{outline:3px solid var(--flight);outline-offset:3px}.plate,.on-night{--flight:var(--flight-on-dark);--airspace:var(--airspace-on-dark);--ground:var(--ground-on-dark);--landing:var(--landing-on-dark);--ink:var(--chalk);--ink-2:var(--chalk-2);--hair:var(--night-hair);background:var(--night);color:var(--chalk)}@media (forced-colors:active){:focus-visible{outline:3px solid canvastext}}strong,b{font-weight:600}.num{font-variant-numeric:tabular-nums lining-nums}.wrap{width:100%;max-width:calc(var(--max) + 2 * var(--gutter));padding-inline:var(--gutter);margin-inline:auto}.measure{max-width:var(--measure)}.spread{gap:1.5rem;display:grid}@media (width>=72rem){.spread{grid-template-columns:minmax(0,8fr) minmax(0,3fr);column-gap:4rem}.spread>.margin{padding-top:.35rem}}.margin{font-size:var(--fs-note);color:var(--ink-2);line-height:1.5}.margin p+p{margin-top:.75em}.caps{font-size:var(--fs-caps);letter-spacing:.1em;text-transform:uppercase;font-weight:600}.lead{font-size:var(--fs-lead);line-height:1.48}.note,.small{font-size:var(--fs-note);line-height:1.5}.muted{color:var(--ink-2)}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;position:absolute!important}.running-head{font-family:"Source Sans 3", "Source Sans Caps Fallback", var(--sans);border-top:1px solid var(--ink);color:var(--ink);flex-wrap:wrap;justify-content:space-between;gap:.25rem 2rem;margin:0 0 1.5rem;padding-top:.55rem;display:flex}.running-head>span:last-child{color:var(--ink-2)}.section{padding-block:clamp(3.5rem,2.5rem + 4vw,6.5rem)}.section+.section{padding-top:0}.section__title{max-width:31ch;margin-bottom:1.25rem}.button{background:var(--ink);min-height:48px;color:var(--paper);font:600 var(--fs-ui) / 1.2 var(--sans);letter-spacing:.005em;cursor:pointer;border:0;border-radius:0;justify-content:center;align-items:center;gap:.6rem;padding:.7rem 1.35rem;text-decoration:none;display:inline-flex}.button:hover{background:var(--flight)}.plate .button,.on-night .button{background:var(--chalk);color:var(--night)}.button--line{color:inherit;background:0 0;box-shadow:inset 0 0 0 1px}.button--line:hover{background:0 0;box-shadow:inset 0 0 0 2px}.arrow{vertical-align:-.1em;flex:none;width:.95em;height:.95em;display:inline-block}label,legend{font-weight:600;font-size:var(--fs-small)}select{appearance:none;border:1px solid var(--ink);min-height:48px;color:var(--ink);font:500 1rem/1.3 var(--sans);background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3.5 6l4.5 4.5L12.5 6' fill='none' stroke='%23111315' stroke-width='1.6'/%3E%3C/svg%3E") right .8rem center/.95rem no-repeat;border-radius:0;padding:.6rem 2.4rem .6rem .85rem}.table{border-collapse:collapse;width:100%;font-size:var(--fs-small)}.table thead th{border-bottom:1px solid var(--ink);text-align:left;vertical-align:bottom;padding:0 .75rem .55rem 0}.table tbody th,.table td{border-bottom:1px solid var(--hair);text-align:left;vertical-align:top;padding:.85rem .75rem .85rem 0}.table tbody tr:last-child>*{border-bottom:1px solid var(--ink)}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}.spread>*,.wrap>*,.section>*{min-width:0}@media (width<=40rem){:root{--gutter:1.25rem;--fs-body:1.0625rem}.section{padding-block:3rem}.running-head{gap:.3rem 1rem;margin-bottom:1.25rem}.running-head>span:last-child{letter-spacing:.04em}.margin{border-top:1px solid var(--hair);padding-top:1rem}}.apt[data-astro-cid-dihy7dn3]{color:var(--flight);vertical-align:-.2em;flex:none;display:inline-block}.apt--context[data-astro-cid-dihy7dn3]{color:var(--ink-2)}.wordmark[data-astro-cid-qisgtjgl]{min-height:44px;color:inherit;align-items:center;gap:.6rem;text-decoration:none;display:inline-flex}.wordmark__text[data-astro-cid-qisgtjgl]{font-family:var(--display);letter-spacing:.045em;text-transform:uppercase;white-space:nowrap;font-size:1.125rem;font-weight:600;line-height:1}@media (width<=30rem){.wordmark__text[data-astro-cid-qisgtjgl]{letter-spacing:.04em;font-size:1rem;line-height:1.05}.wordmark__text[data-astro-cid-qisgtjgl]>span[data-astro-cid-qisgtjgl]{display:block}}.site-header[data-astro-cid-fzpbxy5g]{z-index:10;background:var(--paper);color:var(--ink);border-bottom:1px solid var(--ink);position:relative}.site-header__inner[data-astro-cid-fzpbxy5g]{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:0 .75rem;min-height:4rem;display:flex}.site-nav[data-astro-cid-fzpbxy5g] ul[data-astro-cid-fzpbxy5g]{flex-wrap:wrap;align-items:center;gap:0 1.6rem;margin:0;padding:0;list-style:none;display:flex}.site-nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]{min-height:44px;font-size:var(--fs-small);border-bottom:2px solid #0000;align-items:center;font-weight:500;text-decoration:none;display:inline-flex}.site-nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]:hover{border-bottom-color:var(--ink-2)}.site-nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g][aria-current=page]{border-bottom-color:var(--flight)}.site-nav__cta[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]{box-shadow:inset 0 0 0 1px var(--ink);padding-inline:.9rem;font-weight:600;border-bottom:0!important}.site-nav__cta[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]:hover{box-shadow:inset 0 0 0 2px var(--ink)}.menu-button[data-astro-cid-fzpbxy5g]{display:none}@media (width<=63.99rem){.is-enhanced[data-astro-cid-fzpbxy5g] .menu-button[data-astro-cid-fzpbxy5g]:not([hidden]){min-height:44px;color:var(--ink);font:600 var(--fs-ui) var(--sans);cursor:pointer;background:0 0;border:0;align-items:center;gap:.55rem;padding:0 .25rem 0 .5rem;display:inline-flex}.menu-button__bars[data-astro-cid-fzpbxy5g],.menu-button__bars[data-astro-cid-fzpbxy5g]:before{background:currentColor;width:18px;height:1.5px;transition:transform .16s;display:block;position:relative}.menu-button__bars[data-astro-cid-fzpbxy5g]:before{content:"";position:absolute;top:6px}.menu-button__bars[data-astro-cid-fzpbxy5g]{transform:translateY(-3px)}.is-open[data-astro-cid-fzpbxy5g] .menu-button__bars[data-astro-cid-fzpbxy5g]{transform:translateY(0)rotate(45deg)}.is-open[data-astro-cid-fzpbxy5g] .menu-button__bars[data-astro-cid-fzpbxy5g]:before{transform:translateY(-6px)rotate(-90deg)}.is-enhanced[data-astro-cid-fzpbxy5g] .site-nav[data-astro-cid-fzpbxy5g]{flex-basis:100%;padding-bottom:1rem;display:none}.is-enhanced[data-astro-cid-fzpbxy5g].is-open .site-nav[data-astro-cid-fzpbxy5g]{display:block}.is-enhanced[data-astro-cid-fzpbxy5g] .site-nav[data-astro-cid-fzpbxy5g] ul[data-astro-cid-fzpbxy5g]{border-top:1px solid var(--ink);flex-direction:column;align-items:stretch}.is-enhanced[data-astro-cid-fzpbxy5g] .site-nav[data-astro-cid-fzpbxy5g] li[data-astro-cid-fzpbxy5g]{border-bottom:1px solid var(--hair)}.is-enhanced[data-astro-cid-fzpbxy5g] .site-nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]{border-bottom:0;min-height:52px;font-size:1.0625rem;display:flex}.is-enhanced[data-astro-cid-fzpbxy5g] .site-nav[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g][aria-current=page]{box-shadow:inset 3px 0 0 var(--flight);padding-left:.85rem}.is-enhanced[data-astro-cid-fzpbxy5g] .site-nav__cta[data-astro-cid-fzpbxy5g]{margin-top:.75rem;border-bottom:0!important}.is-enhanced[data-astro-cid-fzpbxy5g] .site-nav__cta[data-astro-cid-fzpbxy5g] a[data-astro-cid-fzpbxy5g]{justify-content:center}}.colophon[data-astro-cid-nns7i3if]{font-size:var(--fs-note);padding-block:3.5rem 2.5rem;line-height:1.55}.colophon__top[data-astro-cid-nns7i3if]{border-bottom:1px solid var(--night-hair);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem 2rem;padding-bottom:1.5rem;display:flex}.colophon__edition[data-astro-cid-nns7i3if]{color:var(--chalk-2);margin:0}.colophon__grid[data-astro-cid-nns7i3if]{border-bottom:1px solid var(--night-hair);gap:2rem;padding-block:2rem;display:grid}@media (width>=56rem){.colophon__grid[data-astro-cid-nns7i3if]{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:6rem}}.colophon[data-astro-cid-nns7i3if] h2[data-astro-cid-nns7i3if]{color:var(--chalk-2);font-size:var(--fs-caps);margin-bottom:.8rem;font-weight:650}.colophon[data-astro-cid-nns7i3if] p[data-astro-cid-nns7i3if]{color:var(--chalk)}.colophon__grid[data-astro-cid-nns7i3if] section[data-astro-cid-nns7i3if] p[data-astro-cid-nns7i3if]{max-width:42ch}.colophon__explore[data-astro-cid-nns7i3if]{align-items:center;gap:.75rem;min-height:44px;display:inline-flex}.colophon[data-astro-cid-nns7i3if] ul[data-astro-cid-nns7i3if]{margin:0;padding:0;list-style:none}@media (width>=30rem){.colophon[data-astro-cid-nns7i3if] ul[data-astro-cid-nns7i3if]{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:2rem;display:grid}}.colophon[data-astro-cid-nns7i3if] li[data-astro-cid-nns7i3if] a[data-astro-cid-nns7i3if]{align-items:center;min-height:40px;display:inline-flex}.colophon__legal[data-astro-cid-nns7i3if]{margin-top:1.5rem;color:var(--chalk-2)!important}.skip-link[data-astro-cid-z4jru4n3]{z-index:100;background:var(--flight);color:#fbfaf7;padding:.75rem 1rem;font-weight:600;position:absolute;top:-10rem;left:1rem}.skip-link[data-astro-cid-z4jru4n3]:focus{top:1rem}main[data-astro-cid-z4jru4n3]:focus{outline:none}