:root{--ink:#375775;--muted:#5c7283;--purple:#625d9a;--violet:#e5e6f6;--mint:#d8f5ee;--green:#218d82;--coral:#cb5270;--pale:#f3f9fc;--line:#c6dce4;--white:#fff;--yellow:#fae9a7}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--pale);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.62}
a{color:var(--purple);text-underline-offset:4px}
a:hover{color:var(--coral)}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--coral);outline-offset:4px}
h1{overflow-wrap:anywhere;font-family:Georgia,'Times New Roman',serif;font-size:40px;line-height:1.14;font-weight:800;letter-spacing:-1.25px;margin:8px 0 22px}
h2{font-family:Georgia,'Times New Roman',serif;font-size:28px;line-height:1.21;font-weight:800;letter-spacing:-.55px;margin:0 0 16px}
h3{font-size:20px;line-height:1.3;margin:0 0 9px;color:var(--ink)}p{font-size:16px;line-height:1.65;margin:0 0 15px}p:last-child{margin-bottom:0}
small{font-size:12px}
.container{width:min(1210px,calc(100% - 76px));margin-inline:auto}
.site-head{background:var(--white);border-bottom:1px solid var(--line)}
.head-inner{display:flex;align-items:center;justify-content:space-between;gap:28px;min-height:83px}
.brand{display:flex;gap:13px;align-items:center;text-decoration:none;color:var(--ink);white-space:nowrap}
.brand-sign{height:37px;width:37px;display:grid;place-content:center;background:var(--purple);color:white;font-weight:900;font-size:25px;clip-path:polygon(0 0,100% 0,100% 73%,72% 100%,0 100%)}
.brand-name{font-weight:900;font-size:17px;letter-spacing:.7px;line-height:1.1}.brand-sub{display:block;letter-spacing:1.4px;font-size:10px;color:var(--muted);font-weight:700;margin-top:4px}
.desktop-nav{display:flex;gap:0;align-items:center;flex-wrap:wrap}
.desktop-nav a{display:block;padding:12px 14px;text-decoration:none;font-size:14px;font-weight:700;color:var(--ink);border-bottom:3px solid transparent}
.desktop-nav a:hover,.desktop-nav a[aria-current=page]{color:var(--purple);border-bottom-color:var(--coral)}
.mobile-nav{display:none}
.eyebrow{font-size:12px;line-height:1.4;letter-spacing:2px;font-weight:900;text-transform:uppercase;color:var(--purple)}
.intro{background:#625d9a;color:white;border-bottom:5px solid #b5e5d9}.intro h1{color:white}.intro .eyebrow{color:#d8f5ee}.intro p{color:white}.intro .hero-tape span{color:var(--ink);background:#f1f9fd;border-color:#a6ccc6}
.intro-inner{display:grid;grid-template-columns:minmax(0,1.04fr) minmax(0,.96fr);gap:45px;align-items:center;padding-block:52px 48px}.intro-inner>*{min-width:0}
.lead{font-size:16px;max-width:620px;line-height:1.57;color:#416780;margin:0 0 20px}
.hero-tape{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.hero-tape span{padding:7px 12px;border:1px solid #99c9c6;background:rgba(255,255,255,.55);font-size:13px;font-weight:700;color:var(--ink)}
.diagram{background:#fbffff;border:1px solid #9ecaca;position:relative;min-height:285px;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:25px}
.diagram:before,.diagram:after{content:'';position:absolute;inset:16px;border:1px dashed #b1d9d4;pointer-events:none}
.diagram:after{inset:auto;top:0;bottom:0;left:50%;width:1px;background:#cae8e3;border:0}
.diagram-circle{position:relative;width:208px;height:208px;border:13px solid #b5e5d9;border-radius:50%;box-shadow:inset 0 0 0 2px #329889,0 0 0 2px #329889;background:radial-gradient(circle at 50% 50%,#f4fcfb 0 35%,#d8f5ee 36% 100%);z-index:1;display:flex;align-items:center;justify-content:center;text-align:center;font-weight:900;color:var(--purple);font-size:23px;line-height:1.12;transform:rotate(-5deg)}
.diagram-circle:before{content:'';position:absolute;inset:40px;border:1px dashed #67b7ae;border-radius:50%}
.diagram-label{position:absolute;z-index:2;color:var(--ink);background:#fbffff;padding:6px 10px;border-left:4px solid var(--coral);font-weight:800;font-size:12px;line-height:1.25;max-width:140px}
.diagram-label.one{left:19px;top:25px}.diagram-label.two{right:15px;top:61px}.diagram-label.three{left:21px;bottom:26px}.diagram-label.four{right:17px;bottom:23px}
.strip{display:flex;justify-content:space-between;align-items:center;gap:18px;border-bottom:1px solid var(--line);padding-block:16px}
.strip span{font-size:12px;letter-spacing:1.3px;font-weight:800;color:var(--purple)}
.strip strong{font-size:13px;color:var(--muted);font-weight:700;text-align:right}
.main-content{padding:40px 0 70px}
.section{margin-top:56px}.section:first-child{margin-top:0}
.section-head{display:flex;align-items:baseline;gap:20px;margin-bottom:21px;border-bottom:2px solid var(--purple);padding-bottom:13px}
.section-head .section-number{font-family:Consolas,monospace;font-weight:700;font-size:13px;color:var(--coral)}
.section-head h2{margin:0}
.track{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:4px solid var(--green);border-bottom:1px solid var(--line)}
.track-step{position:relative;padding:22px 22px 21px;border-right:1px solid var(--line)}.track-step:last-child{border-right:0}
.track-index{font:900 26px/1 Consolas,monospace;color:var(--coral);margin-bottom:11px}
.track-step h3{font-size:18px;margin:0 0 8px}.track-step p{font-size:16px;line-height:1.55}
.rail-link{display:inline-block;font-weight:800;text-decoration:none;font-size:14px;border-bottom:1px solid var(--purple);margin-top:7px}
.vs{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.vs-item{border-top:5px solid var(--coral);background:var(--white);padding:23px 27px}
.vs-item.good{border-top-color:var(--green)}
.vs-item .tag{font-size:12px;font-weight:900;letter-spacing:1.1px;color:var(--coral);margin-bottom:8px}.vs-item.good .tag{color:var(--green)}
.sample{font-weight:700;font-size:18px;line-height:1.5;display:block;margin:0 0 12px;color:var(--ink)}
.dataset{border-top:1px solid var(--line)}
.data-row{display:grid;grid-template-columns:minmax(180px,24%) minmax(0,1fr) minmax(195px,25%);border-bottom:1px solid var(--line);background:var(--white)}
.data-row>*{padding:18px 18px;margin:0;border-right:1px solid var(--line)}.data-row>*:last-child{border-right:0}
.data-row h3{font-size:17px}.data-row p{font-size:16px}.data-row .detail{background:#edf6fa;color:var(--purple);font-weight:700}
.split-note{display:grid;grid-template-columns:1.25fr .75fr;gap:30px;align-items:stretch}
.story{background:var(--white);padding:27px;border-left:4px solid var(--green)}
.notebox{background:var(--violet);padding:27px;display:flex;flex-direction:column;justify-content:center}
.notebox b{color:var(--purple)}
.wide-callout{display:flex;align-items:center;gap:27px;background:var(--mint);padding:28px 32px;border-top:1px solid #a5d5c9}
.wide-callout .call-number{font:900 46px/1 Consolas,monospace;white-space:nowrap;color:var(--green)}
.wide-callout p{margin:0}
.breadcrumb{display:flex;gap:11px;align-items:center;flex-wrap:wrap;color:var(--muted);font-size:13px;margin-bottom:24px}
.breadcrumb a{text-decoration:none;font-weight:700}
.sub-hero{background:var(--violet);border-bottom:1px solid #bec5ed}
.sub-hero-inner{padding:46px 0 40px;display:grid;grid-template-columns:minmax(0,1.38fr) minmax(250px,.62fr);gap:42px;align-items:center}.sub-hero-inner>*{min-width:0}
.sub-hero .lede{font-size:16px;max-width:760px;color:var(--ink)}
.sub-side{border-left:5px solid var(--coral);padding:8px 0 8px 22px;font-size:15px;color:var(--ink)}.sub-side strong{display:block;font-size:12px;letter-spacing:1.3px;color:var(--coral);margin-bottom:9px}
.longform{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:42px}
.longform section{padding:0}.longform h2{margin-bottom:13px}
.longform section:nth-child(2){border-left:1px solid var(--line);padding-left:42px}
.sequence{border-top:3px solid var(--purple)}
.sequence-row{display:grid;grid-template-columns:75px minmax(180px,.54fr) minmax(0,1fr);gap:23px;padding:24px 3px;border-bottom:1px solid var(--line);align-items:start}
.sequence-row .no{font:900 27px/1 Consolas,monospace;color:var(--coral)}
.sequence-row h3{margin:0;font-size:20px}.sequence-row p{margin:0}
.rule-block{background:var(--mint);padding:28px 30px;margin-top:28px}
.compare-lines{border-top:2px solid var(--purple)}
.compare-line{display:grid;grid-template-columns: minmax(185px,24%) minmax(0,1fr);border-bottom:1px solid var(--line)}
.compare-line h3{padding:18px 23px;background:#e5f0f7;font-size:16px;margin:0}
.compare-line .note-text{padding:18px 23px;background:var(--white)}.compare-line p{margin:0}
.quote-slip{background:var(--yellow);position:relative;padding:27px 30px;transform:rotate(-.4deg);border:1px solid #e1d489}
.quote-slip h3{margin-bottom:8px}.quote-slip p{font-size:16px}
.log-columns{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);background:var(--white)}
.log-col{padding:25px 28px}.log-col:first-child{border-right:1px solid var(--line)}.log-col ul{margin:10px 0 0;padding-left:20px}.log-col li{margin-bottom:10px}
.log-label{font-size:12px;letter-spacing:1.3px;font-weight:900;color:var(--coral);display:block;margin-bottom:8px}
.action-line{margin-top:45px;border-top:2px solid var(--purple);padding-top:20px;display:flex;justify-content:space-between;gap:25px;align-items:start}
.action-line p{font-weight:700;max-width:530px}
.next-link{padding:12px 18px;color:white;background:var(--purple);font-weight:800;text-decoration:none;white-space:nowrap}
.next-link:hover{background:var(--coral);color:white}
.calc{background:var(--white);border:1px solid var(--line)}
.calc-head{display:flex;justify-content:space-between;gap:20px;align-items:center;background:var(--mint);padding:18px 24px;border-bottom:1px solid var(--line)}
.calc-head h2{margin:0}.calc-head span{font-size:12px;font-weight:900;letter-spacing:1.2px;color:var(--purple)}
.calc-body{padding:8px 24px 22px}
.calc-row{display:grid;grid-template-columns:minmax(0,1fr) 175px;gap:16px;align-items:center;border-bottom:1px solid var(--line);padding:13px 0}
.calc-row label{font-weight:700}.calc-row input{font-size:16px;padding:9px 12px;border:1px solid #a4c2cf;border-radius:0;background:#f8fbff;width:100%;color:var(--ink)}
.calc-result{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:21px 24px;background:var(--purple);color:white}
.calc-result strong{font-size:27px;font-variant-numeric:tabular-nums;letter-spacing:-.5px}
.calc-result span{font-weight:700}
.calc-foot{font-size:16px;color:var(--muted);margin:13px 24px 22px}
.site-foot{background:#e5edf7;border-top:1px solid var(--line);padding-block:29px}
.foot-inner{display:flex;justify-content:space-between;align-items:center;gap:25px}
.foot-title{font-weight:900;letter-spacing:.6px}.site-foot p{font-size:16px;margin:3px 0 0}
.foot-nav{display:flex;gap:15px;flex-wrap:wrap;justify-content:flex-end}.foot-nav a{font-size:13px;font-weight:700;text-decoration:none}
@media(max-width:1050px){.container{width:min(100% - 46px,1210px)}.intro-inner{gap:24px}.sub-hero-inner{gap:26px}.diagram-label.two{right:8px}.diagram-label.four{right:8px}.track-step{padding:18px}.data-row{grid-template-columns:22% 1fr 25%}.data-row>*{padding:15px}.desktop-nav a{padding-inline:9px;font-size:13px}}
@media(max-width:760px){.container{width:calc(100% - 36px)}.head-inner{min-height:70px}.desktop-nav{display:none}.mobile-nav{display:block;position:relative}.mobile-nav summary{cursor:pointer;font-weight:800;list-style:none;padding:7px 15px;border:1px solid var(--line);color:var(--ink);background:var(--pale)}.mobile-nav summary::-webkit-details-marker{display:none}.mobile-nav summary:after{content:' +';color:var(--coral)}.mobile-nav[open] summary:after{content:' −'}.mobile-nav nav{position:absolute;z-index:10;top:43px;right:0;width:min(290px,calc(100vw - 36px));padding:5px;background:var(--white);border:1px solid var(--line);box-shadow:0 12px 24px #37577525}.mobile-nav nav a{display:block;text-decoration:none;padding:9px 12px;font-size:15px;font-weight:700;border-bottom:1px solid var(--line)}.mobile-nav nav a:last-child{border-bottom:0}
.intro-inner{grid-template-columns:1fr;padding-block:36px 30px;gap:20px}.diagram{min-height:250px}.strip{align-items:start}.track{grid-template-columns:1fr 1fr}.track-step:nth-child(2){border-right:0}.track-step:nth-child(-n+2){border-bottom:1px solid var(--line)}.data-row{grid-template-columns:1fr 1fr}.data-row h3{grid-column:1/-1;border-right:0;border-bottom:1px solid var(--line);background:#edf6fa}.data-row p{border-right:1px solid var(--line)}.data-row .detail{border-right:0;background:white}.split-note{grid-template-columns:1fr;gap:15px}.sub-hero-inner{grid-template-columns:1fr;gap:18px;padding-block:36px 33px}.sub-side{max-width:600px}.longform{grid-template-columns:1fr;gap:25px}.longform section:nth-child(2){border-left:0;padding:0;border-top:1px solid var(--line);padding-top:25px}.sequence-row{grid-template-columns:56px 1fr;gap:12px}.sequence-row p{grid-column:2}.foot-inner{align-items:start;flex-direction:column}.foot-nav{justify-content:start}.main-content{padding-bottom:45px}.section{margin-top:39px}}
@media(max-width:480px){.container{width:calc(100% - 28px)}h1{overflow-wrap:anywhere;font-family:Georgia,'Times New Roman',serif;font-size:40px;letter-spacing:-1.7px}h2{font-size:28px}.brand-sub{font-size:9px}.intro-inner{padding-block:29px 24px}.diagram{min-height:255px;padding:18px}.diagram-circle{width:170px;height:170px;border-width:10px;font-size:19px}.diagram-circle:before{inset:32px}.diagram-label{font-size:11px;padding:5px 6px;max-width:90px}.diagram-label.one{top:19px;left:8px}.diagram-label.two{top:56px;right:8px}.diagram-label.three{left:8px;bottom:19px}.diagram-label.four{bottom:17px;right:8px}.vs{grid-template-columns:1fr;gap:14px}.vs-item{padding:20px}.track{grid-template-columns:1fr}.track-step{border-right:0;border-bottom:1px solid var(--line)}.track-step:last-child{border-bottom:0}.data-row{grid-template-columns:1fr}.data-row h3{grid-column:1}.data-row p{border-right:0;border-bottom:1px solid var(--line)}.section-head{gap:10px}.section-head .section-number{font-size:11px}.wide-callout{align-items:start;gap:15px;padding:22px}.wide-callout .call-number{font-size:34px}.sequence-row{grid-template-columns:44px 1fr}.compare-line{grid-template-columns:1fr}.compare-line h3{padding:10px 17px}.compare-line .note-text{padding:15px 17px}.log-columns{grid-template-columns:1fr}.log-col:first-child{border-right:0;border-bottom:1px solid var(--line)}.log-col{padding:21px}.action-line{flex-direction:column;gap:10px}.calc-head{align-items:start;flex-direction:column;gap:6px}.calc-row{grid-template-columns:1fr;gap:5px}.calc-row input{max-width:100%}.calc-result strong{font-size:23px}.strip{flex-direction:column;gap:4px}.strip strong{text-align:left}}
@media print{body{background:white}.site-head,.site-foot,.mobile-nav,.desktop-nav,.action-line{display:none!important}.container{width:100%}.intro,.sub-hero{background:white}.section{break-inside:avoid}}