:root{color-scheme:dark;--bg:#090e14;--surface:#131b25;--raised:#1a2633;--line:#2b3a48;--ink:#f4f8fc;--muted:#aebfcb;--dim:#7f94a3;--accent:#a6e0ff;--accent-dark:#092738;--gold:#eac37e;--danger:#ff9c9c;--radius:20px;--max:1240px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.62 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;letter-spacing:-.006em}body:before{content:"";position:absolute;pointer-events:none;left:0;right:0;top:0;height:810px;background:radial-gradient(ellipse at 75% 13%,#14324488,transparent 48%),linear-gradient(180deg,#0d1927,transparent 75%)}button,input,select,textarea{font:inherit}button{cursor:pointer}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #7ccaff;outline-offset:3px}.skip{position:absolute;left:-9999px;z-index:50;background:white;color:#111;padding:12px}.skip:focus{left:12px;top:10px}.wrap{max-width:var(--max);padding:0 30px;margin:auto;position:relative}.topbar{position:sticky;top:0;background:#0b121bdd;backdrop-filter:blur(24px);z-index:30;border-bottom:1px solid #ffffff13}.nav{height:76px;display:flex;gap:24px;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:11px;letter-spacing:.18em;font-size:15px;font-weight:850;color:#f3f7fc}.brand:hover{text-decoration:none}.mark{width:36px;height:36px;border:1px solid #79beda88;display:grid;place-items:center;border-radius:10px;color:#a6e0ff;font-size:24px;font-weight:650;transform:skew(-5deg)}.navlinks{display:flex;gap:24px;align-items:center}.navlinks a{font-size:13px;font-weight:650;color:#b3c3ce;letter-spacing:.025em}.navlinks a[aria-current=page]{color:#fff}.navlinks a:hover{color:#fff}.nav-cta{border:1px solid #85b9d155;border-radius:24px;padding:9px 16px}.menu-toggle{display:none;background:none;border:1px solid var(--line);border-radius:10px;color:#fff;padding:8px 12px}.eyebrow{color:var(--accent);font-weight:750;font-size:11px;letter-spacing:.22em;text-transform:uppercase}.hero{padding:85px 0 30px}.hero h1{font-size:clamp(45px,6vw,82px);font-weight:650;letter-spacing:-.065em;line-height:1.055;max-width:940px;margin:20px 0 24px}.hero h1 em{font-style:normal;color:#8dc9ea}.subhead{color:var(--muted);font-size:18px;max-width:660px;line-height:1.7;margin:0 0 30px}.hero-flags{display:flex;gap:24px;flex-wrap:wrap;color:#a6b9c7;font-size:12px;letter-spacing:.07em;text-transform:uppercase}.hero-flags span:before{content:"●";color:#9bd8f3;font-size:8px;padding-right:9px}.hero-grid{display:grid;grid-template-columns:1.09fr .91fr;gap:30px;align-items:stretch;margin:42px 0 60px}.panel{background:linear-gradient(140deg,#172431f7,#0f1822f8);border:1px solid #37536a77;box-shadow:0 25px 65px #01060b72;border-radius:var(--radius);overflow:hidden}.panel-pad{padding:30px}.panel-header{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:21px}.panel-title{font-size:14px;font-weight:770;letter-spacing:.06em;text-transform:uppercase}.pill{font-size:10px;padding:6px 10px;border-radius:99px;background:#203947;color:#a6e0ff;border:1px solid #3a6077;letter-spacing:.12em;text-transform:uppercase}.panel h2{font-size:26px;line-height:1.2;letter-spacing:-.035em;margin:0 0 8px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.field{display:flex;flex-direction:column;gap:7px;min-width:0}.field>label{color:#b8cad6;font-size:12px;font-weight:650}.field input,.field select,.field textarea{width:100%;padding:12px 13px;border-radius:10px;color:#f5f9fd;background:#0c151f;border:1px solid #405263;min-height:49px;outline:none}.field textarea{min-height:94px}.field input:focus,.field select:focus{border-color:#97d5fc}.field input::placeholder{color:#718693}.span-all{grid-column:1/-1}.choice{display:flex;align-items:center;gap:9px;min-height:45px;font-size:13px;color:#c0d0d8}.choice input{accent-color:#a6e0ff;width:17px;height:17px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:48px;border-radius:10px;padding:11px 19px;background:var(--accent);color:#0b1b28;border:1px solid var(--accent);font-weight:790;font-size:13px;letter-spacing:.02em;text-decoration:none}.btn:hover{background:#d3efff;text-decoration:none}.btn.ghost{color:#e2eff8;background:#152534;border:1px solid #3a5367}.btn.ghost:hover{background:#233c4e}.button-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-top:18px}.fineprint{color:#8fa4b2;font-size:12px;margin:12px 0 0}.fineprint a{color:#a3d8f3}.result{margin-top:20px;padding:20px;border:1px solid #476174;background:linear-gradient(145deg,#0b1a24,#152b3a);border-radius:14px}.result .caption{font-size:11px;color:#9eb5c4;letter-spacing:.12em;text-transform:uppercase;font-weight:650}.result .big{font-size:clamp(36px,4.2vw,58px);line-height:1.1;font-weight:650;letter-spacing:-.055em;display:block;margin:8px 0 4px;font-variant-numeric:tabular-nums}.result .summary{color:#e2f1f8;font-size:13px}.metrics{display:grid;grid-template-columns:repeat(3,1fr);margin-top:14px;gap:8px}.metric{border-top:1px solid #45607570;padding-top:10px;min-width:0}.metric small{display:block;color:#98abb9;font-size:10px;text-transform:uppercase;letter-spacing:.09em}.metric strong{font-size:16px;font-weight:710;font-variant-numeric:tabular-nums}.status{border-left:3px solid var(--gold);background:#2b251c;padding:11px 14px;border-radius:4px;color:#f5d6a3;font-size:12px;margin:15px 0}.error{color:#ffd2d2;background:#481f2690;border-color:#ff9696}.visually-hidden{position:absolute;width:1px;height:1px;clip:rect(0,0,0,0);white-space:nowrap;overflow:hidden}.route-viz{position:relative;min-height:500px;background:radial-gradient(circle at 65% 28%,#214357a3,transparent 38%),linear-gradient(165deg,#162b3c,#0b1119 68%);overflow:hidden}.route-viz:after{content:"";position:absolute;inset:0;opacity:.12;background-image:linear-gradient(#a3bbcc88 1px,transparent 1px),linear-gradient(90deg,#a3bbcc88 1px,transparent 1px);background-size:43px 43px;transform:rotate(-20deg) scale(1.5)}.route-viz svg{position:absolute;inset:0;width:100%;height:100%;z-index:1}.route-overlay{position:absolute;left:26px;top:25px;z-index:2;display:flex;flex-direction:column;gap:6px}.route-overlay small{color:#a7bacc;text-transform:uppercase;letter-spacing:.17em;font-size:10px}.route-overlay strong{font-weight:600;font-size:16px}.route-bottom{position:absolute;bottom:25px;left:25px;right:25px;display:flex;gap:10px;justify-content:space-between;align-items:end;z-index:2}.route-bottom>div{background:#09131dda;padding:14px 16px;border:1px solid #45617b80;border-radius:12px}.route-bottom small{display:block;color:#aac2d1;font-size:10px;letter-spacing:.12em}.route-bottom strong{font-size:19px}.section{padding:50px 0}.section h2{font-size:clamp(28px,3vw,43px);letter-spacing:-.045em;line-height:1.16;margin:10px 0 14px;font-weight:650}.section-lead{color:#afc0cb;max-width:750px;margin:0 0 30px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:17px}.feature{padding:27px;border:1px solid #2e4150;background:#111a25;border-radius:17px;transition:transform .18s,border-color .18s}.feature:hover{transform:translateY(-3px);border-color:#6a91a8}.feature .ficon{display:flex;align-items:center;justify-content:center;width:43px;height:43px;border-radius:11px;background:#233b49;color:#a7e0ff;font-size:21px;margin-bottom:19px}.feature h3{font-size:18px;margin:0 0 8px;letter-spacing:-.025em}.feature p{font-size:13px;color:#b2c1cd;margin:0 0 15px;min-height:58px}.feature a{font-weight:650;font-size:12px}.article-shell{display:grid;grid-template-columns:minmax(0,1fr) 275px;gap:48px;padding-top:40px}.page-header{padding:65px 0 23px}.page-header h1{font-size:clamp(37px,5vw,65px);letter-spacing:-.055em;line-height:1.12;margin:14px 0 18px;max-width:900px}.page-header p{font-size:17px;color:#b4c4ce;max-width:780px}.breadcrumb{font-size:12px;color:#98aab8;padding-top:24px}.breadcrumb a{color:#b1c2cc}.breadcrumb span{padding:0 9px;color:#637987}.article h2{font-size:28px;line-height:1.2;letter-spacing:-.035em;margin:36px 0 12px}.article h3{font-size:19px;margin:24px 0 8px}.article p,.article li{color:#bfcbd4}.article p{max-width:76ch}.article ul{padding-left:20px}.aside{align-self:start;position:sticky;top:100px;border:1px solid #2e4251;border-radius:14px;padding:23px;background:#121d27}.aside h3{margin:0 0 15px}.aside a{display:block;padding:8px 0;border-bottom:1px solid #2c3d4c;color:#bed7e4;font-size:13px}.aside a:last-child{border:0}.prose-table{border-collapse:collapse;width:100%;margin:20px 0 30px;font-size:13px}.prose-table th,.prose-table td{text-align:left;border-bottom:1px solid #344554;padding:12px}.prose-table th{color:#dceafa}.example{background:#172836;border:1px solid #334e63;border-radius:14px;padding:21px;margin:20px 0;color:#d4e7f4}.faq details{border-bottom:1px solid #304351;padding:14px 0}.faq summary{cursor:pointer;font-weight:650}.faq p{margin:10px 0;color:#b4c5d0}.footer{margin-top:75px;border-top:1px solid #263847;background:#0b131c;padding:50px 0 35px}.footer-grid{display:grid;grid-template-columns:1.35fr repeat(3,1fr);gap:28px}.footer a{display:block;color:#acbdc8;font-size:13px;padding:5px 0}.footer p{font-size:13px;max-width:290px;color:#93a7b5}.footer h4{font-size:12px;letter-spacing:.08em;text-transform:uppercase;margin:0 0 10px}.footnote{border-top:1px solid #233645;margin-top:30px;padding-top:20px;color:#7e96a5;font-size:11px}.tool-section{margin:25px 0 30px}.tool-section .panel{max-width:780px}.tool-section .panel-pad{padding:30px}.mini-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.mini-bar{height:9px;border-radius:20px;background:#2a4250;overflow:hidden;margin:8px 0}.mini-bar i{display:block;background:#8dd2fa;height:100%;border-radius:20px}.quiet-link{color:#c4deef}.source-note{font-size:12px;color:#98b0bd;border-left:2px solid #678aa1;padding-left:12px}.divider{height:1px;background:#253a49;margin:28px 0}@media(max-width:1000px){.hero-grid{grid-template-columns:1fr}.route-viz{min-height:380px}.article-shell{grid-template-columns:minmax(0,1fr)}.aside{position:static}.cards{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1.5fr 1fr 1fr}.footer-grid>*:last-child{grid-column:2/4}}@media(max-width:700px){.wrap{padding:0 18px}.nav{height:66px}.menu-toggle{display:block}.navlinks{position:absolute;top:66px;left:0;right:0;background:#101b25;padding:16px 20px;display:none;flex-direction:column;align-items:stretch;border-bottom:1px solid #304a5b}.navlinks.open{display:flex}.navlinks a{padding:7px}.hero{padding-top:53px}.hero h1{font-size:48px}.hero-grid{gap:16px;margin-top:27px}.panel-pad,.tool-section .panel-pad{padding:20px}.form-grid{grid-template-columns:1fr}.form-grid .span-all{grid-column:1}.cards{grid-template-columns:1fr}.feature p{min-height:0}.route-viz{min-height:305px}.page-header{padding:38px 0 10px}.article-shell{padding-top:18px;gap:22px}.metrics{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}.footer-grid>*:first-child{grid-column:1/-1}.footer-grid>*:last-child{grid-column:auto}.mini-grid{grid-template-columns:1fr}.hero-flags{gap:10px 16px}.route-bottom strong{font-size:14px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}

/* RC-ARCHIVE-MAIN-01 Forge fixes: no layout permutation. */
input,.field select,.field textarea{border-color:#6a8091} /* 4.47:1 vs #0c151f, 4.10:1 vs panel (was #405263 2.28:1) */
.navlinks a{display:inline-flex;align-items:center;min-height:44px;padding-inline:6px}
.footer a{display:flex;align-items:center;min-height:44px;padding:0}
.feature a{display:inline-flex;align-items:center;min-height:44px}
.breadcrumb a{display:inline-flex;align-items:center;min-height:44px}
.menu-toggle{min-height:44px;min-width:44px}
.choice{min-height:44px;align-items:center}
.route-viz.has-map svg,.route-viz.has-map:after{display:none}
.route-viz .gmap{position:absolute;inset:0;z-index:2}
.route-viz.has-map .route-overlay,.route-viz.has-map .route-bottom{pointer-events:none;z-index:3}
.route-viz.has-map .route-bottom{display:none}
@media (max-width:700px){.hero{padding:22px 0 6px}.hero h1{font-size:36px;margin:10px 0 12px;line-height:1.08}.hero .subhead{font-size:15px;margin:0 0 10px}.hero-flags{gap:6px 14px;font-size:11px}.hero-grid{margin-top:14px}}
.brand{min-height:44px;display:inline-flex;align-items:center}
details>summary{min-height:44px;display:flex;align-items:center}
.article p a,.article li a{padding-block:12px;margin-block:-12px} /* inline prose links: WCAG 2.5.8 inline exception; enlarged hit area without reflow */
.epa-picker{border:0;padding:0;margin:0}.epa-picker legend{font-size:13px;margin-bottom:6px}
.epa-row{display:grid;grid-template-columns:1fr 1.2fr 1.6fr;gap:8px}.epa-row select{min-height:49px;width:100%;color:#f5f9fd;background:#0c151f;border:1px solid #6a8091;border-radius:10px;padding:0 10px}
@media (max-width:700px){.epa-row{grid-template-columns:1fr}}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.footer a,.footer-grid a{min-height:44px!important;display:flex!important;align-items:center}
.aside a{min-height:44px!important;display:flex!important;align-items:center}
.table-scroll{overflow-x:auto;max-width:100%}.table-scroll>table{min-width:36rem}#worked-example a{text-decoration:underline}