@font-face{font-family:Public Sans;src:url('/fonts/public-sans-latin-400-normal.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:Public Sans;src:url('/fonts/public-sans-latin-600-normal.woff2') format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:Public Sans;src:url('/fonts/public-sans-latin-400-italic.woff2') format('woff2');font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:Source Serif;src:url('/fonts/source-serif-4-latin-400-normal.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:Source Serif;src:url('/fonts/source-serif-4-latin-600-normal.woff2') format('woff2');font-weight:600;font-display:swap}
:root{--paper:#fbfaf6;--white:#fffefa;--ink:#24362e;--muted:#58665e;--accent:#22583f;--line:#d7ddd4;--tint:#edf1ea;--serif:'Source Serif',Georgia,serif;--sans:'Public Sans',Arial,sans-serif;color-scheme:light}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:115px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.75;text-rendering:optimizeLegibility}
::selection{background:#c9e4d1;color:#173d30}
*{scrollbar-color:#94aa9b var(--paper);scrollbar-width:thin}
a{color:var(--accent);text-underline-offset:4px;text-decoration-thickness:1px}
a:hover{color:#102e20;text-decoration-thickness:2px}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #337b56;outline-offset:5px}
button,input{font:inherit;caret-color:var(--accent)}
button{cursor:pointer}
svg{stroke:currentColor;stroke-width:1.6;fill:none}
.skip-link{position:fixed;top:-100px;left:20px;z-index:20;padding:10px 20px;background:var(--ink);color:white}
.skip-link:focus{top:10px;color:white}
.masthead{min-height:103px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:22px 36px;border-top:4px solid var(--ink);border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:0;z-index:5}
.brand{display:flex;align-items:center;gap:16px;font:20px/1.16 var(--serif);text-decoration:none;color:var(--ink)}
.brand strong{font-weight:600}
.brand-mark{display:block;width:23px;height:37px;border-left:3px solid var(--accent);border-right:1px solid var(--accent);position:relative}
.brand-mark:after{content:'';position:absolute;left:6px;top:8px;width:15px;height:1px;background:var(--accent);box-shadow:0 8px var(--accent),0 16px var(--accent)}
.header-actions{display:flex;align-items:center;gap:38px}
.edition{font-size:13px;color:var(--muted)}
.search-link{font-size:14px;text-decoration:none;display:flex;align-items:center;gap:9px}
.layout{display:grid;grid-template-columns:248px minmax(0,820px) 180px;gap:0 50px;max-width:1510px;margin:auto;padding:0 36px}
.sidebar{padding:31px 24px 36px 0;border-right:1px solid var(--line);position:sticky;top:103px;height:calc(100dvh - 103px);overflow-y:auto}
.nav-group{font-size:11px;line-height:1.5;font-weight:600;text-transform:uppercase;letter-spacing:.055em;color:var(--muted);margin:28px 0 9px}
.nav-group:first-child{margin-top:0}
.nav-part{font-size:12px;line-height:1.4;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--ink);margin:30px 0 4px;padding-top:14px;border-top:1px solid var(--line)}
.nav-subgroup{margin:14px 0 6px 12px;text-transform:none;letter-spacing:0;font-size:12px}
.nav-sublist{margin-left:12px!important;border-left:1px solid var(--line);padding-left:10px!important}
.not-found-parts{list-style:none;padding:0;margin:28px 0;display:grid;gap:12px}
.not-found-parts li{border:1px solid var(--line);border-radius:4px;padding:14px 18px;background:var(--white)}
.not-found-parts a{font-weight:600;display:block}
.not-found-parts span{color:var(--muted);font-size:14px}
.sidebar ul,.mobile-contents ul,.on-page ul{padding:0;list-style:none;margin:0}
.sidebar li{margin:3px 0}
.sidebar a,.mobile-contents nav a{display:block;padding:6px 10px;margin-left:-10px;text-decoration:none;font-size:13px;line-height:1.5;color:var(--muted);border-radius:3px}
.sidebar a:hover,.mobile-contents nav a:hover{background:var(--tint);color:var(--ink)}
.sidebar a[aria-current],.mobile-contents nav a[aria-current]{background:#e1eadf;color:#1b4933;font-weight:600}
.sidebar-note{font-family:var(--serif);font-size:14px;line-height:1.5;color:var(--muted);margin-top:35px;padding-top:20px;border-top:1px solid var(--line)}
main{min-width:0;padding:60px 0 24px;outline:none}
article h1{font:400 clamp(38px,4vw,58px)/1.08 var(--serif);letter-spacing:-.025em;max-width:780px;text-wrap:balance;margin:0 0 30px}
article h1+p{font-size:20px;line-height:1.65;color:#344a3e;margin-bottom:25px}
article h2{font:600 30px/1.25 var(--serif);letter-spacing:-.015em;margin:58px 0 18px;text-wrap:balance}
article h3{font:600 23px/1.3 var(--serif);margin:35px 0 14px}
article p,article ul,article ol{margin:0 0 23px}
article p,article li{max-width:72ch}
article img{max-width:100%;height:auto}
article li{padding-left:4px;margin-bottom:10px}
strong{font-weight:600}
article blockquote{border-left:1px solid var(--accent);padding:4px 0 4px 24px;margin:30px 0;font:24px/1.6 var(--serif)}
.on-page{padding-top:62px;position:sticky;top:103px;align-self:start;max-height:calc(100dvh - 103px);overflow:auto;font-size:12px;line-height:1.65}
.on-page nav>p{font-weight:600;margin:0 0 15px}
.on-page li{margin-bottom:12px}
.on-page a{color:var(--muted);text-decoration:none}
.on-page a:hover{text-decoration:underline;color:var(--accent)}
.reading-time{padding-top:22px;margin-top:25px;border-top:1px solid var(--line);color:var(--muted)}
.back-top{display:inline-block;margin-top:8px}
.diagram{margin:32px 0 35px;background:#f5f6f0;border:1px solid var(--line)}
.diagram-scroll{overflow-x:auto;padding:28px 20px;scrollbar-width:auto}
.diagram img{display:block;width:auto;height:auto;min-width:0;max-width:100%;margin:auto;object-fit:contain}
.diagram.wide img{min-width:680px}
.diagram.authored img{width:100%;min-width:0;max-width:100%}
.diagram.authored.wide figcaption:after{display:none}
.diagram figcaption{display:flex;justify-content:space-between;gap:18px;border-top:1px solid var(--line);padding:12px 17px;font-size:11px;line-height:1.5}
.diagram figcaption span:first-child{font-weight:600}
.diagram-source{padding:0 17px 11px;font-size:11px}
summary{cursor:pointer}
.diagram-source summary{color:var(--muted);width:fit-content}
pre{white-space:pre;overflow:auto;padding:17px;background:var(--tint);font-size:12px;line-height:1.65}
code{font-family:Consolas,monospace}
p code,td code{background:var(--tint);font-size:.9em;padding:2px 4px;overflow-wrap:anywhere}
.table-scroll{overflow-x:auto;margin:27px 0 32px}
table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.65;text-align:left}
th{border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);padding:14px 15px 14px 0;font-weight:600;vertical-align:top}
td{border-bottom:1px solid var(--line);padding:15px 15px 15px 0;vertical-align:top;min-width:145px;overflow-wrap:anywhere}
td:first-child{font-weight:600}
.chapter-pagination{display:grid;grid-template-columns:1fr 1fr;gap:30px;margin:60px 0 40px;padding-top:25px;border-top:1px solid var(--ink)}
.chapter-pagination a{text-decoration:none;font:23px/1.35 var(--serif);position:relative;padding-right:25px}
.chapter-pagination a>span{display:block;color:var(--muted);font:11px/1.5 var(--sans);margin-bottom:9px}
.chapter-pagination a>svg{position:absolute;right:0;bottom:2px}
.chapter-pagination a:hover{text-decoration:underline}
.page-footer{border-top:1px solid var(--line);padding-top:20px;color:var(--muted);font-size:11px;line-height:1.65}
.page-footer p{margin:0 0 5px}
.page-footer a{color:var(--muted)}
.mobile-contents{display:none}
.search-form{margin:35px 0 20px}
.search-form label{display:block;font-weight:600;font-size:14px;margin-bottom:9px}
.search-form>div{display:flex;gap:10px}
.search-form input{width:100%;min-width:0;border:1px solid #7d9180;background:var(--white);padding:13px 15px;border-radius:2px;font-size:15px}
.search-form input::placeholder{color:#637269}
.search-form button{background:var(--accent);color:white;border:0;border-radius:2px;padding:12px 22px;font-size:14px}
.search-form button:hover{background:#173d30}
.search-form button:disabled{opacity:.6;cursor:wait}
#search-status{font-size:14px;color:var(--muted)}
#search-results{list-style:none;padding:0}
#search-results li{padding:23px 0;border-top:1px solid var(--line);margin:0}
#search-results h2{font:600 24px/1.3 var(--serif);margin:0 0 10px}
#search-results p{font-size:14px;line-height:1.7;margin:0}
#search-results small{display:block;font-size:11px;color:var(--muted);margin-bottom:7px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(min-width:1600px){.layout{gap:0 65px}}
@media(max-width:1250px){.layout{grid-template-columns:230px minmax(0,800px);gap:38px}.on-page{display:none}.edition{display:none}}
@media(max-width:850px){.masthead{padding:17px 22px;min-height:86px}.brand{font-size:18px}.layout{display:block;padding:0 24px;max-width:800px}.sidebar{display:none}.mobile-contents{display:block;border-bottom:1px solid var(--line);padding:0 24px;background:var(--paper)}.mobile-contents>summary{font-size:13px;padding:14px 0;color:var(--accent);font-weight:600}.mobile-contents nav{padding:12px 10px 24px;columns:2;column-gap:30px}.mobile-contents ul{break-inside:avoid}.mobile-contents .nav-group{break-after:avoid}.mobile-contents nav a{font-size:13px}main{padding-top:39px}article h1{font-size:44px}article h2{margin-top:44px;font-size:29px}article h1+p{font-size:19px}.diagram-scroll{padding:20px 15px}.diagram figcaption{flex-wrap:wrap;gap:6px 15px}.diagram.wide figcaption:after{content:'Scroll across to explore this model.';color:var(--muted);width:100%}.header-actions{gap:10px}}
@media(max-width:480px){body{font-size:16px}.brand{font-size:16px}.brand-mark{width:18px;height:32px}.brand-mark:after{width:11px;left:4px}.brand{gap:10px}.masthead{padding:15px 19px}.desktop-only{display:none}.search-link{font-size:12px;gap:6px}.layout{padding:0 21px}.mobile-contents{padding:0 21px}.mobile-contents nav{columns:1}article h1{font-size:38px}article h1+p{font-size:18px}article h2{font-size:27px}.chapter-pagination{gap:23px}.chapter-pagination a{font-size:20px}.search-form>div{flex-wrap:wrap}.search-form button{width:100%}table{font-size:13px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.masthead{position:static;padding:15px 0}.header-actions,.sidebar,.on-page,.mobile-contents,.chapter-pagination,.diagram-source,.skip-link{display:none}.layout{display:block;padding:0;max-width:none}main{padding-top:25px}body{background:white;color:black;font-size:11pt}.diagram{break-inside:avoid}.diagram-scroll{overflow:visible}.diagram img,.diagram.wide img{min-width:0!important;max-height:650px}.diagram figcaption{font-size:9pt}.diagram figcaption:after{display:none}h1,h2{break-after:avoid}a{color:inherit}.table-scroll{overflow:visible}table{font-size:10pt}td{min-width:0}}