:root{--bg:#080b10;--panel:#11161e;--panel2:#171e28;--line:#2a3544;--text:#f1f5f9;--muted:#a5afbc;--cyan:#38d6e8;--green:#5de09b;--amber:#ffb45c;--red:#ff7373;--max:1180px}
*{box-sizing:border-box}
html{color-scheme:dark;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.65}
a,a:visited{color:var(--cyan);text-decoration-color:rgba(56,214,232,.55);text-underline-offset:3px}
a:hover,a:focus-visible{color:#91edf5;text-decoration-color:currentColor}
.skipLink{position:absolute;left:-999px;top:10px;background:var(--text);color:var(--bg);padding:10px;z-index:100}
.skipLink:focus{left:10px}
.siteHeader{min-height:70px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:24px;padding:12px max(20px,calc((100vw - var(--max))/2));position:sticky;top:0;z-index:20;background:rgba(8,11,16,.96)}
.siteBrand{display:flex;align-items:center;gap:11px;color:var(--text);font-weight:850;text-decoration:none;white-space:nowrap}
.brandMark{width:28px;height:28px;border:1px solid var(--cyan);border-radius:50%;box-shadow:inset 0 0 0 6px var(--bg);background:var(--green)}
.siteNav{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.siteNav a{color:var(--muted);text-decoration:none;padding:8px 10px;border-radius:5px;font-size:.88rem;font-weight:700}
.siteNav a:hover,.siteNav a:focus-visible{background:var(--panel2);color:var(--text)}
.siteNav .accountLink{border:1px solid var(--line);color:var(--text);margin-left:5px}
.wrap{width:min(var(--max),calc(100% - 40px));margin-inline:auto}
.pageHeader{padding:72px 0 54px;border-bottom:1px solid var(--line);background:#0b1017}
.eyebrow{margin:0 0 12px;color:var(--cyan);font-weight:850;letter-spacing:.14em;text-transform:uppercase;font-size:.76rem}
h1,h2,h3{line-height:1.12;letter-spacing:0;margin-top:0}
h1{max-width:900px;font-size:clamp(2.6rem,6vw,5.4rem);margin-bottom:20px}
h2{font-size:clamp(1.7rem,3vw,2.7rem);margin-bottom:18px}
h3{font-size:1.15rem;margin-bottom:9px}
.lede{max-width:820px;font-size:1.15rem;color:#c7d0db;margin:0}
.band{padding:56px 0;border-bottom:1px solid var(--line)}
.band.alt{background:#0c1118}
.sectionHead{display:grid;grid-template-columns:minmax(0,.65fr) minmax(320px,.35fr);gap:40px;align-items:end;margin-bottom:30px}
.sectionHead p{margin:0;color:var(--muted)}
.grid2,.grid3{display:grid;gap:16px}
.grid2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid3{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{display:block;border:1px solid var(--line);background:var(--panel);border-radius:7px;padding:22px;color:var(--text);text-decoration:none}
.card:hover{border-color:#4c6279;background:var(--panel2);color:var(--text)}
.card p{color:var(--muted);margin-bottom:0}
.cardMeta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.tag{border:1px solid var(--line);border-radius:999px;padding:3px 8px;color:var(--muted);font-size:.72rem;text-transform:uppercase;font-weight:800}
.tag.live{border-color:#2f7656;color:var(--green)}
.formula{font-family:"Cambria Math",Cambria,Georgia,serif;font-size:1.18rem;background:#070a0e;border:1px solid var(--line);border-left:3px solid var(--cyan);padding:16px 18px;margin:18px 0;overflow:auto}
.callout{border:1px solid var(--line);border-left:3px solid var(--amber);background:#0d1219;padding:20px;margin:24px 0}
.callout strong{display:block;margin-bottom:6px}
.prose{max-width:820px}
.prose p,.prose li{color:#c1cad5}
.prose h2{margin-top:52px}
.prose h3{margin-top:30px}
.prose li{margin-bottom:8px}
.keyTable{width:100%;border-collapse:collapse;margin:22px 0}
.keyTable th,.keyTable td{text-align:left;padding:12px;border-bottom:1px solid var(--line);vertical-align:top}
.keyTable th{color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.08em}
.path{counter-reset:path;display:grid;gap:0}
.pathStep{display:grid;grid-template-columns:48px 1fr;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.pathStep:before{counter-increment:path;content:counter(path,decimal-leading-zero);color:var(--amber);font-family:ui-monospace,monospace;font-weight:900}
.pathStep p{margin:5px 0 0;color:var(--muted)}
.action{display:inline-flex;align-items:center;min-height:44px;padding:10px 15px;background:var(--cyan);color:#041014;text-decoration:none;font-weight:850;border-radius:5px}
.action:hover{background:#8deaf2;color:#041014}
.action.secondary{background:transparent;color:var(--text);border:1px solid var(--line)}
.accountShell{max-width:720px}
.accountGrid{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:18px;align-items:start}
.accountForm{display:grid;gap:17px;border:1px solid var(--line);background:var(--panel);padding:24px;border-radius:7px}
.card .accountForm{border:0;background:transparent;padding:8px 0 0}
.accountForm label{display:grid;gap:7px;color:var(--text);font-size:.88rem;font-weight:800}
.accountForm label span{color:var(--muted);font-size:.75rem;font-weight:600}
.accountForm input,.accountForm textarea{width:100%;background:#080c11;color:var(--text);border:1px solid var(--line);border-radius:5px;padding:12px;font:inherit}
.accountForm input:focus,.accountForm textarea:focus{outline:2px solid var(--cyan);outline-offset:2px}
.accountForm button{font:inherit;border:0;cursor:pointer}
.accountAside,.accountNote{color:var(--muted)}
.notice{border:1px solid var(--line);padding:13px 15px;margin-bottom:16px;border-radius:5px}
.notice.good{border-color:#2d7052;background:#0c241a;color:#a9f4ce}
.notice.bad{border-color:#7d3c3c;background:#281313;color:#ffc3c3}
.actionRow{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.sources{font-size:.9rem;color:var(--muted)}
.sources li{margin-bottom:9px}
.labGrid{display:grid;grid-template-columns:320px minmax(0,1fr);gap:18px;align-items:start}
.instrumentPanel{border:1px solid var(--line);background:var(--panel);border-radius:7px;padding:22px}
.control{display:grid;gap:8px;margin:18px 0}
.control label{font-size:.82rem;color:var(--muted);font-weight:800;text-transform:uppercase;letter-spacing:.06em}
.control input,.control select{width:100%;background:#080c11;color:var(--text);border:1px solid var(--line);border-radius:5px;padding:11px;accent-color:var(--cyan)}
.readoutGrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.readout{border:1px solid var(--line);background:#090d12;padding:16px;border-radius:6px;min-width:0}
.readout span{display:block;color:var(--muted);font-size:.72rem;text-transform:uppercase;font-weight:800;margin-bottom:7px}
.readout strong{display:block;font-family:ui-monospace,monospace;font-size:clamp(1rem,2.4vw,1.45rem);overflow-wrap:anywhere}
.approachTrack{height:52px;border:1px solid var(--line);position:relative;background:#080c11;margin:18px 0}
.approachTrack:before{content:"excluded point x = 0";position:absolute;left:10px;top:7px;color:var(--red);font-size:.72rem}
.approachMarker{position:absolute;bottom:8px;width:12px;height:12px;background:var(--cyan);border-radius:50%;transform:translateX(-50%)}
.approachLine{position:absolute;left:10px;right:10px;bottom:13px;border-top:1px solid var(--line)}
.statusGood{color:var(--green)}
.statusWarn{color:var(--amber)}
.statusBad{color:var(--red)}
.siteFooter{padding:42px 0;background:#06080c;color:var(--muted)}
.footerGrid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px}
.footerGrid a,.footerGrid span{display:block;color:var(--muted);margin-bottom:7px}
.footerGrid a,.footerGrid a:visited{color:#8ce9f2;font-weight:700;text-decoration-color:rgba(140,233,242,.48)}
.footerGrid a:hover,.footerGrid a:focus-visible{color:var(--text);text-decoration-color:var(--cyan)}
.footerGrid strong{color:var(--text)}
.footerGrid p{margin:8px 0 0}
@media(max-width:850px){.siteHeader{position:static;align-items:flex-start;flex-direction:column}.sectionHead,.grid3,.footerGrid,.labGrid,.accountGrid{grid-template-columns:1fr}.grid2{grid-template-columns:1fr}.pageHeader{padding:48px 0 38px}.readoutGrid{grid-template-columns:1fr}}
@media(max-width:520px){.wrap{width:min(var(--max),calc(100% - 24px))}.siteHeader{padding:12px}.siteNav{width:100%}.siteNav a{padding:7px 8px}.band{padding:40px 0}.card{padding:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}