:root{--ink:#17243a;--muted:#53647b;--blue:#244fc4;--line:#dce3ed;--wash:#f5f7fb;--navy:#142d50;--radius:12px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:#fff;color:var(--ink);font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:#152f76}button,input{font:inherit}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #e19418;outline-offset:4px}h1,h2,h3{line-height:1.2;letter-spacing:-.025em}h1{font-size:clamp(2.15rem,3.5vw,3.1rem);margin:10px 0 18px;font-weight:740;max-width:23ch}h2{font-size:1.48rem;margin:42px 0 16px;font-weight:700}h3{font-size:1.15rem}p{margin:0 0 18px}li{margin:8px 0}ul,ol{padding-left:25px}strong{font-weight:650}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:30px;min-height:82px;padding:14px 30px;background:#fffffff5;border-bottom:1px solid var(--line);backdrop-filter:blur(10px)}.brand{display:flex;align-items:center;gap:12px;min-width:245px;text-decoration:none;color:var(--navy);font-size:19px;font-weight:700;line-height:1.2}.brand small{display:block;font-size:11px;font-weight:500;letter-spacing:.12em;text-transform:uppercase;margin-top:5px;color:var(--muted)}.mark{display:grid;place-items:center;width:38px;height:38px;background:var(--navy);border-radius:10px;color:#fff;font:700 25px Georgia,serif}.search{display:flex;align-items:center;background:var(--wash);border:1px solid var(--line);border-radius:8px;max-width:520px;flex:1;overflow:visible}.search input{min-width:0;width:100%;padding:9px 14px;border:0;background:transparent;color:var(--ink);font-size:14px;border-radius:8px}.search button{background:#fff;border:1px solid var(--line);padding:3px 10px;border-radius:5px;font-size:12px;color:var(--muted);margin-right:7px;cursor:pointer}.support-link{margin-left:auto;font-size:13px;text-decoration:none;white-space:nowrap}.layout{display:grid;grid-template-columns:260px minmax(0,850px) minmax(160px,210px);gap:38px;max-width:1500px;margin:auto;padding:0 30px}.sidebar{position:sticky;top:82px;height:calc(100vh - 82px);overflow-y:auto;border-right:1px solid var(--line);padding:28px 20px 50px 0;scrollbar-width:thin}.nav-shell>summary{display:none}.nav-group{margin:0 0 17px;font-size:13px}.nav-group>summary{cursor:pointer;list-style:none;font-weight:700;letter-spacing:.02em;color:var(--ink);padding:6px 0}.nav-group>summary:after{content:'+';float:right;color:var(--muted)}.nav-group[open]>summary:after{content:'−'}.nav-group ul{list-style:none;margin:5px 0 0;padding:0}.nav-group li{margin:1px 0}.nav-group a{display:block;padding:6px 10px;color:var(--muted);line-height:1.45;text-decoration:none;border-radius:6px}.nav-group a:hover{background:var(--wash);color:var(--blue)}.nav-group a[aria-current=page]{color:var(--blue);background:#eaf0ff;font-weight:650;box-shadow:inset 3px 0 var(--blue)}.reading{min-width:0;padding-bottom:40px}.app-switch{display:flex;align-items:center;gap:5px;margin:28px 0 36px;font-size:12px;flex-wrap:wrap}.app-switch a{border:1px solid var(--line);padding:5px 13px;border-radius:6px;color:var(--muted);text-decoration:none}.app-switch a[aria-current=true]{background:var(--navy);border-color:var(--navy);color:#fff}.app-switch span{margin-left:auto;color:var(--muted);font-size:11px;letter-spacing:.07em;text-transform:uppercase}.eyebrow{font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}.lede{font-size:19px;color:var(--muted);line-height:1.55;margin-bottom:30px;max-width:65ch}article{font-size:15px}article>p,article>ol,article>ul{max-width:78ch}article ol li{padding-left:6px;margin:11px 0}.prerequisite,.note{background:var(--wash);border:1px solid var(--line);border-left:3px solid var(--blue);padding:17px 21px;border-radius:0 8px 8px 0}.note p{margin:5px 0 0}.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 34px}.button{display:inline-flex;align-items:center;gap:14px;padding:10px 17px;background:var(--blue);color:#fff;border:1px solid var(--blue);border-radius:7px;text-decoration:none;font-size:14px;font-weight:650}.button:hover{background:#163d9d;color:#fff}.button.secondary{background:white;color:var(--blue);border-color:var(--line)}.cards{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:24px 0}.cards>a{border:1px solid var(--line);border-radius:var(--radius);padding:23px;text-decoration:none;background:linear-gradient(145deg,#fff,#f9fbff);transition:border-color .15s}.cards>a:hover{border-color:var(--blue)}.cards strong{display:block;color:var(--navy);font-size:17px;margin-bottom:8px}.cards span{display:block;color:var(--muted);font-size:14px;line-height:1.6}.toc{position:sticky;top:110px;align-self:start;font-size:12px;padding:22px 0}.toc p{font-weight:700;color:var(--ink);margin-bottom:12px}.toc ul{list-style:none;padding:0;border-left:1px solid var(--line);margin:0}.toc li{margin:0}.toc a{display:block;padding:6px 0 6px 14px;color:var(--muted);text-decoration:none;line-height:1.5}.toc a:hover{color:var(--blue)}.toc .back-top{margin-top:25px;padding-left:0}.table-scroll{overflow-x:auto;margin:22px 0;border:1px solid var(--line);border-radius:8px;max-width:100%}table{border-collapse:collapse;width:100%;text-align:left;font-size:13px;line-height:1.6}th{background:var(--wash);font-weight:650;color:var(--navy)}th,td{padding:12px 15px;border-bottom:1px solid var(--line);vertical-align:top}tr:last-child td{border-bottom:0}td:first-child{min-width:110px}code{font:12px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;overflow-wrap:anywhere;background:#eef2f8;border-radius:4px;padding:2px 5px}pre{position:relative;background:#15263e;color:#e5edff;border-radius:10px;padding:25px 22px;overflow:auto;line-height:1.65;font-size:13px}pre code{color:inherit;background:none;padding:0;overflow-wrap:normal}.copy-code{display:block;margin:8px 0 -8px auto;padding:4px 10px;background:var(--wash);border:1px solid var(--line);color:var(--blue);border-radius:5px;font-size:12px;cursor:pointer}figure{margin:28px 0}figure img{width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:var(--wash)}figcaption{font-size:12px;color:var(--muted);line-height:1.5;margin-top:8px}.download{padding:12px 16px;background:#edf7f3;border:1px solid #cae7d9;border-radius:7px}.download a{color:#1c6348;font-weight:600}.related{margin-top:44px;padding-top:12px;border-top:1px solid var(--line)}.related h2{font-size:13px;letter-spacing:.08em;text-transform:uppercase}.related ul{list-style:none;padding:0}.related a{text-decoration:none}.page-footer{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;margin-top:50px;padding:20px 0;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}.page-footer a{color:var(--muted)}.directory{list-style:none;padding:0}.directory li{padding:14px 0;border-bottom:1px solid var(--line)}.directory a{font-weight:600}.directory span{display:block;color:var(--muted);font-size:13px}.result-count{color:var(--muted);font-size:13px}.skip{position:fixed;top:-100px;left:10px;z-index:30;padding:10px;background:white}.skip:focus{top:10px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:1200px){.layout{grid-template-columns:230px minmax(0,1fr);gap:30px}.toc{display:none}.brand{min-width:230px}}@media(max-width:800px){.topbar{position:relative;padding:16px 20px;gap:16px;flex-wrap:wrap}.brand{min-width:0;flex:1}.support-link{font-size:12px}.search{order:3;flex-basis:100%;max-width:none}.layout{display:block;padding:0 20px}.sidebar{position:static;width:100%;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:14px 0}.nav-shell>summary{display:list-item;cursor:pointer;font-size:14px;font-weight:650;color:var(--blue)}.nav-shell>nav{padding-top:16px}.nav-group{margin:10px 0}.app-switch{margin:22px 0 28px}.cards{grid-template-columns:1fr}h1{font-size:2.2rem}.lede{font-size:18px}.table-scroll{border-radius:5px}th,td{padding:10px}.page-footer{margin-top:35px}html{scroll-padding-top:20px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}@media print{.topbar,.sidebar,.toc,.app-switch,.copy-code,.skip{display:none}.layout{display:block;padding:0}.page-footer{font-size:10px}body{font-size:11pt}h2{break-after:avoid}figure,table{break-inside:avoid}a{color:inherit}.table-scroll,pre{overflow:visible}pre{white-space:pre-wrap;background:#f3f3f3;color:#111}article{font-size:11pt}}

/* Shared example diagram: keep labels readable on narrow screens. */
.model-preview{margin:24px 0 30px}.diagram-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:#fff;padding:24px 14px}.model-preview img{display:block;width:100%;min-width:640px;height:auto;border:0;border-radius:0;background:#fff}.diagram-scroll:focus-visible{outline:3px solid #e19418;outline-offset:3px}.brand>span:last-child{max-width:235px}.app-switch span{white-space:nowrap}@media(max-width:800px){.brand{font-size:16px}.brand>span:last-child{max-width:180px}.model-preview .diagram-scroll{padding:18px 10px}}

.scroll-hint{display:none}@media(max-width:800px){.scroll-hint{display:block;font-size:12px;color:var(--muted);margin:7px 0}}
