@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;0,6..72,600;0,6..72,700;1,6..72,400&family=Instrument+Sans:wght@400;500;600;700&display=swap');
:root{--paper:#fcfaf4;--wash:#f3f0e5;--ink:#26221a;--muted:#5a5344;--olive:#6e6134;--rule:#dcd7c9;--soft:#e8e3d4;--serif:Newsreader,Georgia,serif;--sans:'Instrument Sans',Arial,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 var(--sans)}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a.button{cursor:pointer}a:hover{text-decoration:underline;text-underline-offset:5px}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid 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h3{margin-bottom:12px}.empty button{margin-top:20px}.cta{margin-top:72px;padding:34px 0 40px;border-block:1px solid var(--rule);display:flex;align-items:center;justify-content:space-between;gap:30px}.cta h2{font-size:37px;margin:13px 0 9px}.cta p{font-size:14px}.footer{padding:31px 0 36px;display:flex;justify-content:space-between;gap:24px;color:var(--muted);font-size:12px}.footer nav{display:flex;gap:23px;flex-wrap:wrap}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.article-head{max-width:890px;margin:50px auto 32px}.article-head h1{font-size:clamp(2.7rem,5.5vw,4.7rem);margin:25px 0}.article-head .lead{font-size:20px;max-width:750px;margin-bottom:25px}.breadcrumbs{font-size:13px;color:var(--muted);display:flex;gap:15px;flex-wrap:wrap}.article-hero{max-width:890px;margin:0 auto 45px}.article-layout{display:grid;grid-template-columns:210px 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@media(prefers-reduced-motion:no-preference){.button,.filter{transition:background-color .15s ease,transform .15s ease}.button:active,.filter:active{transform:scale(.96)}}
@media(max-width:850px){.wrap{width:calc(100% - 40px)}.nav{width:calc(100% - 40px);gap:24px}.nav-links{gap:20px}.hero-title{gap:30px}.hero-title p{max-width:260px}.feature-copy{padding-right:25px}.grid{grid-template-columns:repeat(2,1fr)}.article-layout{grid-template-columns:1fr;gap:10px}.toc{position:static;border-bottom:1px solid var(--rule);padding-bottom:20px}.toc nav{display:flex;flex-wrap:wrap;gap:12px 25px}.ref-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:580px){.nav{min-height:78px;gap:15px;flex-wrap:wrap;padding-block:17px}.brand{font-size:26px}.nav-links{order:3;width:100%;justify-content:center;border-top:1px solid var(--rule);padding-top:7px}.nav-actions{gap:15px}.nav-actions .login{display:none}.hero{padding:32px 0}.hero-top{margin-bottom:20px}.hero-top .edition{display:none}.hero-title{display:block}.hero-title p{max-width:340px;margin-top:19px}.hero h1{font-size:3.65rem}.feature{grid-template-columns:1fr;margin-bottom:40px}.feature-copy{padding:28px 0 15px}.feature h2{font-size:2.4rem}.feature .diagram{grid-row:2;margin:10px 0 24px;min-height:250px;padding:18px}.browse-head{display:block}.search{width:100%;margin-top:20px}.search input{font-size:16px}.filters{gap:5px}.filter{padding:8px 11px;font-size:12px}.grid{grid-template-columns:1fr;gap:34px}.card .diagram{height:235px}.card h3{font-size:29px}.result-row{align-items:start}.cta{display:block;margin-top:45px}.cta .button{margin-top:23px}.footer{flex-direction:column}.article-head{margin-top:30px}.article-head .lead{font-size:18px}.article-hero{margin-bottom:25px}.article-hero .diagram{min-height:240px;padding:14px}.ref-grid{grid-template-columns:1fr}.prose{font-size:16px}.hero-top{font-size:10px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.brand img{filter:brightness(0)}