:root{--ink:#002755;--text:#1D2733;--muted:#4F5D6C;--rule:#C9D1DA;--sheet:#FFFFFF;--ground:#EDF0F3;--water:#0B7285}
*{box-sizing:border-box}
body{margin:0;background:var(--ground);color:var(--text);font:400 1.0625rem/1.65 "Archivo",system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--ink);text-underline-offset:.18em}
:focus-visible{outline:3px solid var(--water);outline-offset:3px}
.skip{position:absolute;left:-999px}
.skip:focus{left:1rem;top:1rem;background:var(--sheet);padding:.5rem 1rem;z-index:10}
.site-head{background:var(--sheet);border-bottom:1px solid var(--rule)}
.site-head .in{max-width:72rem;margin:0 auto;padding:0 1rem;min-height:4.5rem;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;font-weight:640;color:var(--ink);font-size:1.15rem}
.brand img{width:2.6rem;height:2.6rem}
.site-head nav a{margin-left:1.25rem;text-decoration:none;font-weight:500}
.crumbs{max-width:46rem;margin:2rem auto 0;padding:0 1rem;font-size:.9rem;color:var(--muted)}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem}
.crumbs li+li::before{content:"/";margin-right:.4rem}
article{max-width:46rem;margin:1rem auto 3rem;padding:2rem 1rem 3rem;background:var(--sheet)}
@media (min-width:48rem){article{padding:3rem 3.5rem}}
h1,h2,h3{font-variation-settings:"wdth" 78;font-stretch:78%;color:var(--ink);line-height:1.15}
h1{font-size:clamp(2rem,4.5vw,2.9rem);margin:0 0 .75rem}
h2{font-size:1.55rem;margin:2.5rem 0 .6rem}
h3{font-size:1.2rem;margin:1.75rem 0 .4rem}
.lede{font-size:1.2rem;color:var(--muted)}
.meta{font-size:.9rem;color:var(--muted);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:.5rem 0;margin:1.25rem 0 2rem}
.eq{margin:1.25rem 0;padding:.9rem 1rem;background:#F5F7F9;border-left:3px solid var(--water);overflow-x:auto;font-size:1.05rem}
.eq math{font-size:1.15em}
.eq .where{display:block;margin-top:.6rem;font-size:.92rem;color:var(--muted)}
table{border-collapse:collapse;width:100%;margin:1.25rem 0;font-size:.95rem}
caption{text-align:left;font-weight:600;color:var(--ink);margin-bottom:.4rem}
th,td{border:1px solid var(--rule);padding:.45rem .6rem;text-align:left;vertical-align:top}
th{background:#F5F7F9;color:var(--ink)}
.tbl{overflow-x:auto}
.refs{font-size:.92rem}
.refs li{margin:.35rem 0}
.cta{margin-top:2.5rem;padding:1.25rem;border:1px solid var(--ink)}
.related{list-style:none;padding:0}
.related li{margin:.3rem 0}
footer{background:var(--sheet);border-top:1px solid var(--ink);padding:1.25rem 1rem;font-size:.88rem;color:var(--muted);text-align:center}
.call{position:fixed;right:16px;bottom:16px;z-index:20;display:inline-flex;align-items:center;gap:.5rem;background:#0A66C2;color:#fff;padding:.85rem 1.25rem;border-radius:999px;font:600 1rem/1 "Archivo",system-ui,sans-serif;text-decoration:none;box-shadow:0 4px 14px rgba(0,40,90,.3)}
.call:hover{background:#084F96;color:#fff}
.call:focus-visible{outline:3px solid #002755;outline-offset:3px}
@media (max-width:47.99rem){body{padding-bottom:5rem}}
.menu-btn{display:none}
.nav-extra{display:none}
@media (max-width:47.99rem){
  .site-head{position:sticky;top:0;z-index:40;background:transparent}
  .site-head::before{content:"";position:absolute;inset:0;z-index:-1;background:rgba(255,255,255,.92);-webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px)}
  body.nav-open .site-head::before{background:#fff}
  .site-head .wrap,.site-head .in{flex-wrap:nowrap;min-height:4rem}
  .menu-btn{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:46px;height:46px;padding:0 12px;border:0;border-radius:14px;background:#EEF2F6;cursor:pointer;-webkit-tap-highlight-color:transparent}
  .menu-btn span{display:block;height:2px;background:#002755;border-radius:2px;transition:transform .25s ease,opacity .2s ease}
  .menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .menu-btn[aria-expanded="true"] span:nth-child(2){opacity:0}
  .menu-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  #main-nav{position:fixed;left:0;right:0;top:4rem;bottom:0;display:flex;flex-direction:column;background:#fff;padding:.5rem 1.25rem 2rem;overflow-y:auto;opacity:0;visibility:hidden;transform:translateY(-8px);transition:opacity .22s ease,transform .22s ease,visibility 0s .22s}
  #main-nav.open{opacity:1;visibility:visible;transform:none;transition:opacity .22s ease,transform .22s ease}
  #main-nav ul{display:block;margin:0;padding:0;list-style:none}
  #main-nav a{display:flex;justify-content:space-between;align-items:center;margin:0;padding:1.05rem .1rem;font:600 1.6rem/1.1 "Archivo",system-ui,sans-serif;font-stretch:78%;font-variation-settings:"wdth" 78;color:#002755;text-decoration:none;border-bottom:1px solid #DDE3EA}
  #main-nav ul a::after,#main-nav > a::after{content:"";width:.55rem;height:.55rem;border-top:2px solid #0A66C2;border-right:2px solid #0A66C2;transform:rotate(45deg);margin-right:.35rem}
  .nav-extra{display:grid;gap:.75rem;margin-top:auto;padding-top:2rem}
  #main-nav .nav-extra a{justify-content:center;border:0;border-radius:999px;padding:1rem;font:600 1.05rem/1 "Archivo",system-ui,sans-serif}
  #main-nav .nav-extra .c1{background:#0A66C2;color:#fff}
  #main-nav .nav-extra .c2{background:#EEF2F6;color:#002755}
  body.nav-open{overflow:hidden}
  [id]{scroll-margin-top:4.5rem}
  body.nav-open .call{display:none}
}
@media (prefers-reduced-motion:reduce){#main-nav,.menu-btn span{transition:none}}