@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&display=swap');
:root{--ink:#142d3a;--muted:#526874;--teal:#087a74;--line:#dce6ea;--paper:#f5f8fa;--navy:#102f41}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;font-family:'Be Vietnam Pro',sans-serif;color:var(--ink);font-size:16px;line-height:1.7;background:var(--paper)}a{color:inherit;text-decoration:none}button,select{font:inherit}button,a,select{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #178aeb;outline-offset:4px}header{height:88px;display:flex;align-items:center;gap:24px;justify-content:space-between;padding:0 4%;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.brand{font-size:27px;font-weight:800;letter-spacing:-1px;display:flex;align-items:center;gap:10px}.mark{background:var(--teal);color:white;width:34px;height:38px;border-radius:10px;display:grid;place-items:center;font-family:serif;font-style:italic}.brand-sub{font-size:10px;letter-spacing:1.5px;margin-left:15px;padding-left:20px;border-left:1px solid var(--line)}.edition{font-size:11px;letter-spacing:1.5px;color:var(--muted)}.emergency-link{font-size:13px;color:#a63740;background:#fff2f2;padding:9px 15px;border-radius:6px}.shell{display:grid;grid-template-columns:245px minmax(0,1fr);max-width:1480px;margin:auto}aside{padding:40px 25px;position:sticky;top:88px;height:calc(100vh - 88px);border-right:1px solid var(--line)}.eyebrow{font-size:11px;letter-spacing:1.5px;font-weight:700;line-height:1.7}.teal{color:var(--teal)}nav{margin-top:26px}nav a{display:flex;gap:14px;padding:13px 12px;margin-bottom:7px;font-size:12px;color:var(--muted);border-radius:5px}nav a span{font-size:14px}nav a:hover,nav a.active{background:#e1efee;color:#076861}.scope{margin-top:65px;padding:20px 14px;border-top:2px solid var(--teal)}.small-label{font-size:11px;letter-spacing:1px;font-weight:600}.scope h3{font-size:17px;line-height:1.6}.scope p{font-size:12px;color:var(--muted)}.divider{height:1px;background:var(--line);margin:20px 0}main{padding:42px 48px 0;min-width:0}.intro{display:flex;justify-content:space-between;gap:20px}h1{font-size:clamp(32px,3.3vw,48px);line-height:1.22;letter-spacing:-1.7px;margin:18px 0}h1 span{color:var(--teal)}.lead{font-size:15px;color:var(--muted);line-height:1.9}.chapter{font-size:75px;color:#cddde2;font-weight:400;line-height:1.2;text-align:right;padding-top:22px}.chapter span{display:block;font-size:9px;letter-spacing:2px;line-height:1.7}.notice{display:flex;gap:18px;background:#e9f1f6;border-left:3px solid #7496ad;padding:15px 18px;margin:27px 0;font-size:12px;line-height:1.7}.notice b{white-space:nowrap}.tabs{display:flex;gap:0;border-bottom:1px solid #c5d7db;margin-top:32px}.tabs button{border:0;background:none;padding:18px 24px;color:var(--muted);border-bottom:3px solid transparent;font-weight:600;font-size:17px}.tabs button[aria-selected=true]{color:var(--teal);border-bottom-color:var(--teal)}.tabs small{font-size:11px;margin-left:10px;font-weight:400}.guide-grid{display:grid;grid-template-columns:1fr 260px;background:#fff;border:1px solid var(--line);margin-top:22px;border-radius:9px;overflow:hidden}.steps{padding:26px}.step{display:grid;grid-template-columns:32px 1fr;gap:16px;padding:16px 0}.step+.step{border-top:1px solid var(--line)}.step-num{font-size:12px;color:var(--teal);border:1px solid #c7e2dd;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;margin-top:4px}.step h3{font-size:17px;margin:0 0 7px}.step p{font-size:14px;color:var(--muted);margin:0}.step strong{color:var(--ink)}.reference{background:var(--navy);color:#fff;padding:28px 23px}.reference .eyebrow{color:#8bd7cc}.reference h3{font-size:23px;line-height:1.5}.reference p{font-size:13px;color:#c3d6e1}.reference .big{font-size:29px;font-weight:600;letter-spacing:-1px;color:white}.reference hr{border:0;border-top:1px solid #365362;margin:25px 0}.checklist{display:grid;grid-template-columns:210px 1fr;gap:20px;margin:30px 0 45px}.checklist h2{font-size:22px}.checklist ul{padding-left:20px;font-size:14px;color:var(--muted)}.checklist li{padding:4px 0}section{scroll-margin-top:105px}h2{font-size:27px;line-height:1.4;letter-spacing:-.7px;margin:10px 0 15px}.section-head{display:flex;justify-content:space-between;gap:16px;align-items:center}.pill{font-size:11px;border:1px solid #ccdadd;border-radius:20px;padding:5px 13px;white-space:nowrap}.practice{border-top:1px solid var(--line);padding-top:30px}.practice>p{color:var(--muted);font-size:14px}.practice label{display:block;font-size:13px;font-weight:600;margin:23px 0 8px}select{width:100%;background:white;color:var(--ink);border:1px solid #b9cbd2;padding:13px;border-radius:6px;font-size:14px}.case-grid{display:grid;grid-template-columns:1.1fr 1fr;margin-top:18px;border:1px solid var(--line);border-radius:8px;overflow:hidden}.case-data{padding:22px;background:white}.chart-head{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:12px}#unit{border:1px solid var(--line);background:#f4f8fa;border-radius:4px;padding:5px;font-size:11px;color:var(--teal)}.readings{display:flex;gap:12px;margin:26px 0}.reading{flex:1;padding:16px 5px;text-align:center;border-bottom:3px solid #54a89b;background:#f1f7f6}.reading b{display:block;font-size:25px}.reading span{font-size:11px;color:var(--muted)}.case-data p{font-size:12px;color:var(--muted)}.case-answer{padding:25px;background:#e8f2ef}.case-answer h3{font-size:20px;line-height:1.5}.case-answer p{font-size:14px}.hypo{background:#fff;border:1px solid #e6d6d6;border-top:3px solid #b64f58;padding:27px;margin-top:45px;border-radius:6px}.hypo .eyebrow{color:#a13843}.threshold{font-size:12px;color:#a13843;white-space:nowrap}.hypo>p{font-size:14px;color:var(--muted)}.hypo-steps{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px;margin-top:22px}.hypo-steps strong{font-size:42px;color:#a43b46;font-weight:500}.hypo-steps strong span{font-size:16px;padding-left:6px}.hypo-steps h3{font-size:15px}.hypo-steps p{font-size:13px;color:var(--muted)}.urgent{padding-left:22px;border-left:1px solid #e6d6d6}.hypo-note{padding-top:18px;border-top:1px solid var(--line);font-size:12px!important}.sources{padding:40px 0}.sources>a{display:flex;align-items:center;gap:20px;padding:18px 0;border-bottom:1px solid var(--line)}.sources>a>span{font-size:13px;color:var(--teal)}.sources>a>span:last-child{margin-left:auto}.sources b{font-size:14px}.sources p{font-size:12px;margin:5px 0;color:var(--muted)}.sources .review{margin-top:22px;font-size:11px}footer{display:flex;justify-content:space-between;gap:20px;font-size:10px;padding:22px 0;border-top:1px solid var(--line);color:var(--muted)}@media(min-width:1600px){main{padding-left:60px;padding-right:60px}}@media(max-width:1100px){.shell{grid-template-columns:205px 1fr}aside{padding:30px 15px}main{padding:30px 25px 0}.guide-grid{grid-template-columns:1fr 220px}.edition{display:none}.chapter{display:none}.checklist{grid-template-columns:1fr;gap:0}.checklist ul{margin-top:0}.section-head{flex-wrap:wrap}}@media(max-width:760px){header{height:72px;padding:0 18px}.brand-sub{display:none}.shell{display:block}aside{position:static;height:auto;border:0;padding:8px 15px;background:white}aside>.eyebrow,.scope{display:none}nav{display:flex;overflow-x:auto;margin:0;gap:8px}nav a{white-space:nowrap;margin:0;padding:10px 8px;font-size:10px;gap:5px}nav a span{font-size:12px}main{padding:24px 18px 0}h1{font-size:37px}.eyebrow{font-size:10px}.lead{font-size:14px}.notice{display:block;font-size:12px}.notice b{display:block;margin-bottom:5px}.tabs button{padding:14px 10px;font-size:15px;flex:1}.tabs small{display:block;margin:2px 0}.guide-grid{grid-template-columns:1fr}.steps{padding:15px 20px}.reference{padding:22px}.reference h3{font-size:21px;margin:12px 0}.reference hr{margin:16px 0}.case-grid{grid-template-columns:1fr}h2{font-size:24px}.hypo{padding:20px}.hypo-steps{grid-template-columns:1fr;gap:12px}.hypo-steps>div{border-top:1px solid #eadedf;padding-top:14px}.urgent{border-left:0;padding-left:0}.hypo-steps h3{margin:0 0 8px}.hypo-steps strong{font-size:36px}footer{flex-direction:column;gap:5px}.desktop{display:none}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}