/* Power Fallback: mobile-first, system fonts, no external requests */
:root{
  --ink:#14212b;--ink-2:#3d4f5c;--muted:#5e6f7b;--line:#dde4ea;--bg:#ffffff;--bg-2:#f4f7f9;--bg-3:#e9eff3;
  --navy:#0f2a3d;--navy-2:#163a54;--amber:#ffb020;--amber-ink:#8a5a00;--link:#0b5fa5;--link-h:#073f6e;
  --ok:#17803d;--ok-bg:#e8f6ee;--warn:#9a5b00;--warn-bg:#fff5e0;--bad:#b42318;--bad-bg:#fdecea;--info-bg:#eaf3fb;
  --radius:10px;--shadow:0 1px 2px rgba(15,42,61,.06),0 4px 14px rgba(15,42,61,.06);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --measure:72ch;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:76px}
body{margin:0;font-family:var(--font);font-size:1.0625rem;line-height:1.65;color:var(--ink);background:var(--bg);text-rendering:optimizeLegibility}
img,svg{max-width:100%;height:auto}
a{color:var(--link);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--link-h);text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:3px}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.skip{position:absolute;left:-999px;top:8px;background:var(--amber);color:var(--navy);padding:8px 14px;border-radius:6px;z-index:100;font-weight:700}
.skip:focus{left:8px}
.small{font-size:.875rem}

/* header */
.site-header{background:var(--navy);color:#fff;position:sticky;top:0;z-index:50;border-bottom:3px solid var(--amber)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:60px;gap:12px}
.brand{display:inline-flex;align-items:center;gap:9px;color:inherit;text-decoration:none;font-size:1.15rem;letter-spacing:-.01em}
.brand:hover{color:inherit}
.brand b{color:var(--amber);font-weight:800}
.site-header .brand span{color:#fff;font-weight:600}
.nav-toggle{background:none;border:1px solid rgba(255,255,255,.35);border-radius:8px;width:44px;height:44px;display:inline-grid;place-items:center;cursor:pointer;color:#fff}
.nav-toggle .bars,.nav-toggle .bars::before,.nav-toggle .bars::after{display:block;width:20px;height:2px;background:#fff;position:relative;content:"";transition:transform .2s}
.nav-toggle .bars::before{position:absolute;top:-6px}.nav-toggle .bars::after{position:absolute;top:6px}
.nav-toggle[aria-expanded="true"] .bars{background:transparent}
.nav-toggle[aria-expanded="true"] .bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .bars::after{transform:translateY(-6px) rotate(-45deg)}
.site-nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--navy);border-bottom:3px solid var(--amber)}
.site-nav.open{display:block}
.site-nav ul{list-style:none;margin:0;padding:6px 18px 14px}
.site-nav a{display:block;color:#e6eef4;text-decoration:none;padding:11px 4px;border-bottom:1px solid rgba(255,255,255,.08);font-weight:500}
.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--amber)}
@media (min-width:1000px){
  .nav-toggle{display:none}
  .site-nav{display:block;position:static;background:none;border:0}
  .site-nav ul{display:flex;gap:2px;padding:0}
  .site-nav a{border:0;padding:8px 10px;font-size:.95rem;border-radius:6px}
  .site-nav a:hover{background:rgba(255,255,255,.07)}
}

/* page head */
.page-head{background:linear-gradient(180deg,var(--bg-2),#fff);border-bottom:1px solid var(--line);padding:18px 0 22px}
.page-head h1{font-size:clamp(1.75rem,4.6vw,2.6rem);line-height:1.15;letter-spacing:-.02em;margin:.25em 0 .35em;max-width:30ch}
.page-head .lede{font-size:1.15rem;color:var(--ink-2);max-width:var(--measure);margin:0 0 .6em}
.byline{font-size:.875rem;color:var(--muted);margin:.4em 0 0}
.byline a{color:inherit}
.crumbs ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:4px;font-size:.85rem;color:var(--muted)}
.crumbs li+li::before{content:"\203A";margin:0 6px 0 2px;color:#9aa8b2}
.crumbs a{color:var(--muted)}

/* prose */
.article-grid{padding-top:8px;padding-bottom:24px}
.prose{max-width:var(--measure)}
.prose-wide{max-width:none}
.prose-wide>p,.prose-wide>ul,.prose-wide>ol{max-width:var(--measure)}
.prose h2{font-size:1.55rem;line-height:1.25;letter-spacing:-.01em;margin:2em 0 .5em;padding-top:.3em}
.prose h3{font-size:1.2rem;line-height:1.3;margin:1.6em 0 .4em}
.prose h4{font-size:1.02rem;margin:1.3em 0 .3em}
.prose p,.prose ul,.prose ol{margin:0 0 1em}
.prose li{margin:.25em 0}
.prose li>ul,.prose li>ol{margin:.25em 0}
.prose strong{color:#0b1a24}
.prose code,.prose kbd{font-family:var(--mono);font-size:.88em;background:var(--bg-3);padding:.1em .35em;border-radius:4px}
.prose pre{background:#0f1c26;color:#e8eef2;padding:14px 16px;border-radius:var(--radius);overflow:auto;font-size:.88rem;line-height:1.5}
.prose pre code{background:none;padding:0;color:inherit}
.prose blockquote{margin:1.2em 0;padding:.2em 1em;border-left:4px solid var(--amber);color:var(--ink-2)}
.prose hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.prose figure{margin:1.4em 0}
.prose figcaption{font-size:.875rem;color:var(--muted);margin-top:.4em}

/* tables */
.table-wrap{overflow-x:auto;margin:1.2em 0 1.4em;border:1px solid var(--line);border-radius:var(--radius);-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:.94rem;line-height:1.45}
caption{caption-side:top;text-align:left;font-weight:600;padding:10px 12px;color:var(--ink-2);font-size:.9rem;background:var(--bg-2);border-bottom:1px solid var(--line)}
th,td{padding:9px 12px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
thead th{background:var(--bg-2);font-weight:650;white-space:nowrap;position:sticky;top:0}
tbody tr:last-child td{border-bottom:0}
tbody tr:nth-child(even){background:#fafcfd}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}

/* components */
.takeaways{background:var(--info-bg);border:1px solid #cfe2f3;border-radius:var(--radius);padding:14px 18px 6px;margin:18px 0 22px}
.takeaways-h{font-weight:700;margin:0 0 .3em;font-size:.95rem;text-transform:uppercase;letter-spacing:.04em;color:var(--navy-2)}
.takeaways ul{margin:0 0 .6em;padding-left:1.2em}
.toc{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);padding:10px 16px;margin:0 0 22px}
.toc summary{font-weight:700;cursor:pointer;font-size:.95rem}
.toc ol{margin:.5em 0 .3em;padding-left:1.3em;font-size:.95rem;columns:1}
@media (min-width:720px){.toc ol{columns:2;column-gap:28px}}
.toc li{break-inside:avoid}
.callout{border-radius:var(--radius);padding:12px 16px;margin:1.3em 0;border:1px solid var(--line);background:var(--bg-2)}
.callout>:last-child{margin-bottom:0}
.callout-title{font-weight:700;margin:0 0 .3em}
.callout.warn{background:var(--warn-bg);border-color:#f3d79c}
.callout.danger{background:var(--bad-bg);border-color:#f3b8b2}
.callout.tip{background:var(--ok-bg);border-color:#b8e3c8}
.callout.info{background:var(--info-bg);border-color:#cfe2f3}
.callout.insight{background:#fff;border:1px solid var(--line);border-left:5px solid var(--amber)}
.formula{font-family:var(--mono);background:var(--bg-2);border:1px dashed #b9c7d1;border-radius:8px;padding:10px 14px;margin:1em 0;overflow-x:auto;font-size:.95rem}
.steps{counter-reset:step;list-style:none;padding:0}
.steps>li{counter-increment:step;position:relative;padding-left:44px;margin:0 0 1em}
.steps>li::before{content:counter(step);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--navy);color:#fff;font-weight:700;display:grid;place-items:center;font-size:.9rem}
.verdict{border:2px solid var(--navy);border-radius:var(--radius);padding:12px 16px;margin:1.3em 0}
.verdict>:last-child{margin-bottom:0}
.pill{display:inline-block;font-size:.78rem;font-weight:650;padding:2px 9px;border-radius:99px;background:var(--bg-3);color:var(--ink-2);vertical-align:middle}
.pill.ok{background:var(--ok-bg);color:var(--ok)}.pill.warn{background:var(--warn-bg);color:var(--warn)}.pill.bad{background:var(--bad-bg);color:var(--bad)}

/* faq */
.faq{margin-top:2.4em}
.faq-item{border:1px solid var(--line);border-radius:var(--radius);margin:0 0 10px;background:#fff}
.faq-item summary{cursor:pointer;padding:12px 16px;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.4rem;line-height:1;color:var(--muted);flex:none}
.faq-item[open] summary::after{content:"\2212"}
.faq-item summary h3{font-size:1.02rem;margin:0;font-weight:650;line-height:1.4}
.faq-a{padding:0 16px 4px}
.sources{margin-top:2.4em;font-size:.92rem;color:var(--ink-2)}
.sources h2{font-size:1.15rem}

/* cards */
.cards{display:grid;grid-template-columns:1fr;gap:12px;margin:14px 0 8px}
@media (min-width:640px){.cards{grid-template-columns:repeat(2,1fr)}}
@media (min-width:980px){.cards{grid-template-columns:repeat(3,1fr)}}
.card{display:flex;flex-direction:column;gap:4px;padding:15px 16px;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;color:var(--ink);background:#fff;transition:border-color .15s,box-shadow .15s,transform .15s}
.card:hover{border-color:#9fb4c3;box-shadow:var(--shadow);color:var(--ink);transform:translateY(-1px)}
.kicker{font-size:.74rem;text-transform:uppercase;letter-spacing:.06em;color:var(--amber-ink);font-weight:700}
.card-title{font-weight:650;font-size:1.04rem;line-height:1.35;color:var(--navy)}
.card-desc{font-size:.9rem;color:var(--muted);line-height:1.5}
.related,.hub-list{padding:10px 0 34px;border-top:1px solid var(--line);margin-top:10px}
.related h2,.hub-list h2{font-size:1.3rem}
.page-body{padding-top:10px;padding-bottom:20px}

/* tools */
.tool{background:var(--bg-2);border:1px solid var(--line);border-radius:14px;padding:16px;margin:1em 0 1.6em}
@media (min-width:720px){.tool{padding:22px}}
.tool fieldset{border:0;padding:0;margin:0 0 14px}
.tool legend{font-weight:700;margin-bottom:6px}
.field{display:flex;flex-direction:column;gap:4px;margin:0 0 12px}
.field label{font-weight:600;font-size:.94rem}
.field .hint{font-size:.83rem;color:var(--muted)}
.grid-2{display:grid;grid-template-columns:1fr;gap:0 16px}
@media (min-width:600px){.grid-2{grid-template-columns:1fr 1fr}}
.grid-3{display:grid;grid-template-columns:1fr;gap:0 16px}
@media (min-width:720px){.grid-3{grid-template-columns:1fr 1fr 1fr}}
input[type=number],input[type=text],input[type=search],select{font:inherit;font-size:1rem;padding:10px 12px;border:1px solid #b9c7d1;border-radius:8px;background:#fff;color:var(--ink);width:100%;min-height:44px}
input:focus,select:focus{border-color:var(--link);outline:2px solid #bcd7ef;outline-offset:0}
.btn{font:inherit;font-weight:650;display:inline-flex;align-items:center;gap:6px;padding:10px 16px;min-height:44px;border-radius:8px;border:1px solid var(--navy);background:var(--navy);color:#fff;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--navy-2);color:#fff}
.btn.secondary{background:#fff;color:var(--navy)}
.btn.secondary:hover{background:var(--bg-3)}
.btn.small{padding:6px 10px;min-height:36px;font-size:.9rem}
.btn.amber{background:var(--amber);border-color:#e09a10;color:#1c1300}
.result{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-top:10px}
.result-big{font-size:1.9rem;font-weight:800;color:var(--navy);line-height:1.15;font-variant-numeric:tabular-nums}
.result-label{font-size:.82rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:700}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
@media (min-width:720px){.stats{grid-template-columns:repeat(4,1fr)}}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.stat .v{font-size:1.3rem;font-weight:750;color:var(--navy);font-variant-numeric:tabular-nums}
.stat .l{font-size:.8rem;color:var(--muted)}
.load-row{display:grid;grid-template-columns:1fr 84px 70px 40px;gap:8px;align-items:center;margin-bottom:8px}
.load-row input,.load-row select{min-height:40px;padding:8px 10px}
.load-row .rm{background:none;border:1px solid var(--line);border-radius:8px;height:40px;cursor:pointer;color:var(--muted);font-size:1.1rem}
.load-head{display:grid;grid-template-columns:1fr 84px 70px 40px;gap:8px;font-size:.78rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:4px}
.bar{height:10px;background:var(--bg-3);border-radius:99px;overflow:hidden;margin:6px 0}
.bar>span{display:block;height:100%;background:var(--navy);border-radius:99px}
.bar.warn>span{background:#d98a00}.bar.bad>span{background:var(--bad)}
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;align-items:end;margin:10px 0}
.filter-bar .field{margin:0;flex:1 1 200px}
.count-note{font-size:.88rem;color:var(--muted)}

/* home */
.hero{background:radial-gradient(1200px 400px at 85% -10%,#21506f 0,transparent 60%),var(--navy);color:#fff;padding:38px 0 42px}
.hero h1{font-size:clamp(2rem,6vw,3.2rem);line-height:1.08;letter-spacing:-.025em;margin:0 0 .35em;max-width:20ch}
.hero h1 em{font-style:normal;color:var(--amber)}
.hero p{font-size:1.15rem;color:#d3e0ea;max-width:60ch;margin:0 0 1.2em}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px}
.hero .btn.secondary{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.hero .btn.secondary:hover{background:rgba(255,255,255,.1)}
.hero-search{margin-top:18px;max-width:560px}
.section{padding:34px 0}
.section.alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section h2{font-size:clamp(1.4rem,3.4vw,1.9rem);letter-spacing:-.015em;margin:0 0 .3em}
.section-intro{color:var(--ink-2);max-width:68ch;margin:0 0 1em}
.cluster-grid{display:grid;grid-template-columns:1fr;gap:12px}
@media (min-width:640px){.cluster-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:980px){.cluster-grid{grid-template-columns:repeat(3,1fr)}}
.cluster{border:1px solid var(--line);border-radius:12px;padding:16px;background:#fff}
.cluster h3{margin:0 0 .3em;font-size:1.12rem}
.cluster h3 a{text-decoration:none;color:var(--navy)}
.cluster p{margin:0 0 .6em;font-size:.93rem;color:var(--muted)}
.cluster ul{margin:0;padding-left:1.1em;font-size:.93rem}
.cluster li{margin:.2em 0}
.problem-grid{display:grid;grid-template-columns:1fr;gap:10px}
@media (min-width:640px){.problem-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:980px){.problem-grid{grid-template-columns:repeat(4,1fr)}}
.problem{display:block;padding:14px 16px;border-radius:10px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--ink);font-weight:600}
.problem span{display:block;font-weight:400;font-size:.88rem;color:var(--muted);margin-top:2px}
.problem:hover{border-color:var(--navy)}
.principles{display:grid;grid-template-columns:1fr;gap:14px;counter-reset:pr}
@media (min-width:800px){.principles{grid-template-columns:repeat(3,1fr)}}
.principles>div{border-top:3px solid var(--amber);padding-top:10px}
.principles h3{margin:0 0 .3em;font-size:1.05rem}
.principles p{margin:0;color:var(--ink-2);font-size:.95rem}

/* glossary & search */
.az{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 18px}
.az a{display:inline-grid;place-items:center;min-width:36px;height:36px;border:1px solid var(--line);border-radius:8px;text-decoration:none;font-weight:650}
dl.glossary dt{font-weight:700;font-size:1.08rem;margin-top:1.2em;color:var(--navy)}
dl.glossary dd{margin:.25em 0 0}
.search-results{list-style:none;padding:0;margin:8px 0 0;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;color:var(--ink);max-height:60vh;overflow-y:auto}
.search-results:empty{display:none}
.search-results a{display:block;padding:10px 14px;text-decoration:none;color:var(--ink);border-bottom:1px solid var(--line)}
.search-results a:hover,.search-results a:focus{background:var(--bg-2)}
.search-results small{display:block;color:var(--muted)}

/* footer */
.site-footer{background:#0b1f2d;color:#c5d3dd;padding:36px 0 22px;margin-top:20px;font-size:.93rem}
.site-footer a{color:#dbe6ee;text-decoration:none}
.site-footer a:hover{color:var(--amber);text-decoration:underline}
.site-footer .brand span{color:#fff}
.footer-grid{display:grid;grid-template-columns:1fr;gap:22px}
@media (min-width:700px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1000px){.footer-grid{grid-template-columns:1.6fr repeat(4,1fr)}}
.footer-h{font-size:.82rem;text-transform:uppercase;letter-spacing:.07em;color:#8fa6b6;margin:0 0 8px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:0 0 7px}
.footer-about p{max-width:42ch}
.copy{border-top:1px solid rgba(255,255,255,.1);margin-top:24px;padding-top:14px;font-size:.84rem;color:#8fa6b6}

@media print{.site-header,.site-footer,.related,.toc,.nav-toggle{display:none}body{font-size:12pt}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.chart{position:relative;margin:12px 0}
.chart svg{display:block;width:100%;height:auto;background:#fff;border:1px solid var(--line);border-radius:10px;touch-action:pan-y}
.chart-tip{position:absolute;background:#0f2a3d;color:#fff;font-size:.85rem;padding:6px 10px;border-radius:6px;pointer-events:none;line-height:1.35;white-space:nowrap}
.radio-list{display:grid;gap:8px;margin:6px 0 10px}
.radio-list label{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer;font-weight:500}
.radio-list input{margin-top:5px;accent-color:var(--navy)}
.radio-list label:has(input:checked){border-color:var(--navy);box-shadow:0 0 0 1px var(--navy)}
.principles-links{margin-top:1.2em}
.faq-index{padding-left:1.2em}.faq-index li{margin:.45em 0}
.sidebar{display:none}
@media (min-width:1100px){
  .article-grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:48px;align-items:start}
  .sidebar{display:block;position:sticky;top:80px;max-height:calc(100vh - 96px);overflow-y:auto;padding-top:18px}
  .toc-inline{display:none}
}
.side-box{border-left:3px solid var(--line);padding:2px 0 2px 14px;margin:0 0 22px;font-size:.9rem}
.side-h{font-weight:700;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 6px}
.side-h a{color:inherit;text-decoration:none}
.side-box ol,.side-box ul{list-style:none;margin:0;padding:0}
.side-box li{margin:0 0 6px;line-height:1.35}
.side-box a{text-decoration:none;color:var(--ink-2)}
.side-box a:hover{color:var(--link);text-decoration:underline}
.side-box li[aria-current] a{color:var(--navy);font-weight:700}
.side-tools{border-left-color:var(--amber)}
@media (max-width:480px){.load-row,.load-head{grid-template-columns:1fr 64px 52px 40px;gap:6px}}