:root{color-scheme:light;--ink:#10283d;--muted:#506679;--line:#cfdae3;--teal:#006d65;--paper:#f7fafc;--red:#963b22;--mono:ui-monospace,SFMono-Regular,Consolas,monospace}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 Arial,Helvetica,sans-serif}a{color:#165c9f;text-underline-offset:4px}a:hover{color:var(--teal)}a:focus-visible,summary:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #ca7024;outline-offset:4px}header{display:flex;justify-content:space-between;gap:20px;align-items:center;max-width:1440px;padding:24px 40px;margin:auto;border-bottom:1px solid var(--line)}header a{font-size:14px}.brand{font-size:18px;font-weight:800;letter-spacing:.07em;color:var(--ink);text-decoration:none}.brand span{font-size:13px;font-weight:400;letter-spacing:.03em;color:var(--muted)}.layout{max-width:1360px;margin:0 auto;display:grid;grid-template-columns:230px minmax(0,1fr);gap:55px;padding:45px 40px 60px}.rail{align-self:start;position:sticky;top:24px;max-height:calc(100vh - 48px);overflow-y:auto}.rail nav{display:grid;gap:13px;margin:25px 0}.rail nav a{font-size:15px;text-decoration:none;color:var(--ink);border-left:2px solid var(--line);padding-left:15px}.rail nav a:hover{border-color:var(--teal)}.rail-note{font:13px/1.8 var(--mono);color:var(--muted);margin-top:36px}.eyebrow,.meta{font:12px/1.6 var(--mono);letter-spacing:.08em;color:var(--teal)}main{min-width:0}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2.4rem,4.7vw,4.25rem);line-height:1.08;font-weight:600;letter-spacing:-.045em;margin-bottom:25px}h1 span{color:var(--teal)}h2{font-size:clamp(1.6rem,2.5vw,2.25rem);line-height:1.2;letter-spacing:-.025em;font-weight:500;margin-bottom:0}h3{font-size:21px;line-height:1.3;letter-spacing:-.015em}.lead{font-size:21px;line-height:1.55;max-width:760px}.rule{padding:24px 28px;background:var(--ink);color:#fff;border-left:4px solid #64c6b9;margin:26px 0 38px}.rule b{font-size:22px;line-height:1.3}.rule p{color:#d4e4ec;margin:8px 0 0}.rule.stop{background:#fff2ed;color:var(--red);border-color:var(--red)}.rule.stop p{color:#733d2a}section{padding-top:22px;margin:28px 0 45px;border-top:1px solid var(--ink)}.section-title{display:flex;align-items:baseline;gap:20px;margin-bottom:22px}.section-title>span{font:13px var(--mono);color:var(--teal)}.three,.modes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:23px;margin-bottom:24px}.three article,.modes article{border-top:3px solid var(--teal);padding-top:16px;min-width:0}.three span{font:12px var(--mono);color:var(--muted)}.three h3{margin:12px 0}.three p,.modes p{font-size:16px;color:var(--muted)}.protocol{counter-reset:step -1;list-style:none;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:0 27px}.protocol li{position:relative;padding:16px 0 12px 38px;border-top:1px solid var(--line);min-width:0}.protocol li:before{counter-increment:step;content:counter(step,decimal-leading-zero);position:absolute;left:0;font:13px/2 var(--mono);color:var(--teal)}.protocol p{font-size:16px;color:var(--muted);margin:7px 0}.table-scroll{overflow-x:auto;margin-bottom:22px}table{width:100%;border-collapse:collapse;font-size:15px;text-align:left}th{background:#e6eef4;font-weight:600}td,th{vertical-align:top;padding:13px;border-bottom:1px solid var(--line)}td:first-child{min-width:150px;color:var(--ink)}code{font:14px/1.7 var(--mono);overflow-wrap:anywhere}pre{font:14px/1.6 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere;background:#e8f0f5;padding:22px}details{border-top:1px solid var(--line);padding:15px 0}summary{cursor:pointer;font-size:17px;line-height:1.45;font-weight:600}details>div{padding:19px 0 0 44px}details>p{margin-top:18px}.trap summary span{display:inline-block;font:13px var(--mono);color:var(--teal);width:36px}.trap p{font-size:16px;margin-bottom:13px}.trap .stop{color:var(--red)}.source,.note{font-size:14px;color:var(--muted)}.traps{border-bottom:1px solid var(--line)}.modes code{display:block;color:var(--teal);margin-bottom:12px}.case{padding:24px 26px;background:white;border:1px solid var(--line);margin:18px 0}.case h3{font-size:24px;margin:8px 0 14px}.case fieldset{border:0;padding:0;margin:18px 0;min-width:0}.option{display:flex;gap:12px;align-items:flex-start;font-size:16px;padding:12px 14px;border:1px solid var(--line);margin:8px 0;cursor:pointer}.option:has(input:checked){border-color:var(--teal);background:#e8f6f2}.option input,.checklist input{margin-top:6px;accent-color:var(--teal);width:18px;height:18px;flex:0 0 18px}.answer summary{font-size:15px;color:var(--teal)}.answer p{font-size:16px}.feedback:empty{display:none}.feedback{padding:15px;border-left:3px solid var(--teal);background:#ecf6f2;font-size:16px}.feedback.bad{background:#fff3ec;color:#7b3a23;border-color:var(--red)}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}button{font:600 16px/1.4 Arial,sans-serif;padding:13px 22px;cursor:pointer;border:1px solid var(--ink);border-radius:2px;background:var(--ink);color:#fff}button.secondary{background:transparent;color:var(--ink)}button:disabled{opacity:.6;cursor:wait}.result{padding:18px 0;color:var(--ink);font-weight:600}.checklist label{display:flex;gap:12px;border-top:1px solid var(--line);padding:13px 0;cursor:pointer;font-size:16px}.notes li{padding-bottom:16px}.notes{padding-left:23px}.downloads{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:20px 0}.downloads a{display:block;padding:13px 16px;background:#e7f0f5;border:1px solid var(--line);font-size:15px;text-decoration:none}footer{display:flex;justify-content:space-between;gap:20px;padding:27px 40px;border-top:1px solid var(--line);font-size:14px;max-width:1360px;margin:auto}.skip{position:absolute;top:-200px;left:15px;background:white;padding:10px;z-index:4}.skip:focus{top:15px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:1000px){.layout{grid-template-columns:180px minmax(0,1fr);gap:30px;padding:30px 25px}.three,.modes{grid-template-columns:1fr}.three article,.modes article{padding-top:12px}.protocol{grid-template-columns:1fr}.rail nav a{font-size:14px}header{padding:20px 25px}.brand span{display:none}}@media(max-width:720px){header{padding:18px 20px}.layout{display:block;padding:27px 20px}.rail{position:static;max-height:none;margin-bottom:30px}.rail nav{display:flex;gap:10px 17px;flex-wrap:wrap;margin:15px 0}.rail nav a{border:0;padding:0;font-size:14px}.rail-note{display:none}.eyebrow{font-size:12px}h1{font-size:clamp(2.3rem,9vw,3.6rem)}.lead{font-size:19px}.rule{padding:20px}.rule b{font-size:20px}.section-title{gap:14px}.case{padding:20px 16px}.downloads{grid-template-columns:1fr}details>div{padding-left:0}footer{padding:24px 20px;display:block}footer span{display:block;margin-bottom:12px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{.rail,header,button,.actions,.checklist input,.option input{display:none}.layout{display:block;padding:0}body{background:white;font-size:11pt}h1{font-size:30pt}h2{font-size:20pt}section{break-before:auto}.case,.three article{break-inside:avoid}details>div,details>p{display:block}a{color:inherit}.rule{background:#eee;color:#000}.rule p{color:#222}footer{padding:15px 0}}