/* engineeringlead.com — OWN DESIGN (2026-11-14): "the engineering notebook".
   The site is about the person leading engineers: decisions, measurement, hiring, the record of
   why. So it is set as a bound engineering notebook: quad-ruled graph paper, a red margin rule
   down the left of the page, each guide a numbered notebook ENTRY, Bitter (a slab serif made for
   reading on screen) for headings, a blue-black ink accent with the margin red as a second note.
   Fonts self-hosted (static/fonts, SIL OFL). Styled ENTIRELY by this file ("own_css"). */
@font-face{font-family:"Bitter";font-weight:500 800;font-display:swap;src:url(/fonts/bitter.woff2) format("woff2")}
:root{--paper:#FCFCF9;--grid:#DCE6F0;--ink:#16202B;--ink2:#3E4A57;--mute:#617081;--rule:#C9D4DF;
 --blue:#1F3A68;--margin:#D64545;--link:#1F4F9B;
 --head:"Bitter",Georgia,serif;--sans:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
 --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;color-scheme:light}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;color:var(--ink);font:400 17px/1.7 var(--sans);background-color:var(--paper);
 background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:24px 24px}
img,svg{max-width:100%;height:auto}
a{color:var(--link);text-underline-offset:3px}a:hover{text-decoration-thickness:2px}
.wrap{max-width:1060px;margin:0 auto;padding:0 18px}@media(min-width:720px){.wrap{padding:0 32px}}
main.wrap{position:relative;padding-left:68px}
main.wrap::before{content:"";position:absolute;left:44px;top:0;bottom:0;width:2px;background:var(--margin);opacity:.7}
@media(max-width:640px){main.wrap{padding-left:34px}main.wrap::before{left:18px}}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:10}
:focus-visible{outline:2px solid var(--margin);outline-offset:2px}

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.bar{display:flex;align-items:center;gap:18px;min-height:62px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;margin-right:auto;font:700 21px/1 var(--head)}
.brand svg{width:28px;height:28px;flex:none}.brand svg rect{fill:#fff}
.brand svg .fg{fill:var(--blue)}.brand svg .fgs{stroke:var(--blue)}
.brand b{color:#FFB4B4;font-weight:inherit}
.nav{display:flex;gap:2px;align-items:center;flex-wrap:wrap}
.nav a{color:#CBD6E8;text-decoration:none;padding:8px 10px;font:500 15px/1 var(--sans)}
.nav a:hover,.nav a[aria-current="page"]{color:#fff;box-shadow:inset 0 -2px 0 #FFB4B4}
.navtoggle{display:none;background:none;border:0;padding:8px;cursor:pointer}
.navtoggle span{display:block;width:22px;height:2px;background:#fff;margin:5px 0}
@media(max-width:860px){.navtoggle{display:block}
 .nav{display:none;position:absolute;left:0;right:0;top:62px;background:var(--blue);flex-direction:column;align-items:stretch;padding:8px 18px 18px}
 .nav.open{display:flex}}

main{padding-bottom:64px}
h1,h2,h3{font-family:var(--head);line-height:1.18;text-wrap:balance;color:var(--blue)}
h1{font-size:clamp(34px,5vw,52px);font-weight:800;margin:0 0 18px;letter-spacing:-.01em}
h2{font-size:clamp(24px,3vw,31px);font-weight:700;margin:56px 0 14px}
h3{font-size:20px;font-weight:700;margin:30px 0 8px}
p,ul,ol,.callout,details{max-width:68ch}
.lede{font-size:clamp(18px,2.3vw,20px);color:var(--ink2);max-width:62ch}
.kicker{font:500 13px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--margin);margin:0 0 16px}
code{font-family:var(--mono);font-size:.86em;background:#EAF0F6;padding:1px 5px;border-radius:3px}
.crumb{font:500 13px var(--mono);color:var(--mute);padding-top:24px}.crumb a{color:var(--mute)}
.updated{color:var(--mute);font:500 13px var(--mono);margin-top:40px}
article,.prose{max-width:68ch}

.hero{padding:40px 0 16px}
.is-home .hero{padding:56px 0 24px}
.is-home .hero h1::after{content:"";display:block;width:180px;height:3px;background:var(--margin);margin-top:20px;transform:rotate(-1deg)}

/* guides as notebook entries */
.cards{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(min(100%,440px),1fr));margin:24px 0;max-width:none;counter-reset:en}
.card{counter-increment:en;display:block;background:var(--paper);border:1px solid var(--rule);padding:16px 20px 18px;text-decoration:none;color:var(--ink);box-shadow:3px 3px 0 var(--grid)}
.card::before{content:"ENTRY " counter(en,decimal-leading-zero);display:block;font:500 11.5px var(--mono);letter-spacing:.08em;color:var(--margin);margin-bottom:6px;padding-bottom:6px;border-bottom:1px dashed var(--rule)}
a.card:hover{border-color:var(--blue);box-shadow:3px 3px 0 var(--blue)}
.card h3{margin:0 0 6px;font-size:20px}
.card p{margin:0;color:var(--ink2);font-size:15.5px}
.card .go{display:inline-block;margin-top:10px;font:600 14.5px var(--sans);color:var(--link)}

.callout{border-left:4px solid var(--margin);background:#FFF;padding:14px 18px;margin:24px 0;box-shadow:3px 3px 0 var(--grid)}
.callout p{margin:0}.callout p+p{margin-top:8px}

.table-wrap{overflow-x:auto;margin:20px 0;max-width:100%;border:1px solid var(--blue)}
table{border-collapse:collapse;width:100%;font-size:15.5px;background:#fff;max-width:none}
th,td{text-align:left;vertical-align:top;padding:10px 12px;border:1px solid var(--rule)}
th{font:700 15px/1.3 var(--head);color:var(--blue);background:#EEF3F8}
.table-wrap table{min-width:560px}

ul.check{list-style:none;padding:0}
ul.check li{position:relative;padding-left:34px;margin:10px 0}
ul.check li::before{content:"";position:absolute;left:2px;top:6px;width:16px;height:16px;border:2px solid var(--blue)}
ol.steps{counter-reset:s;list-style:none;padding:0}
ol.steps>li{counter-increment:s;position:relative;padding-left:46px;margin:16px 0}
ol.steps>li::before{content:counter(s);position:absolute;left:0;top:-2px;width:32px;height:32px;border:2px solid var(--margin);border-radius:50%;color:var(--margin);font:700 15px/28px var(--head);text-align:center;transform:rotate(-4deg)}
details{border:1px solid var(--rule);padding:10px 16px;margin:10px 0;background:#fff}
summary{cursor:pointer;font:700 17px/1.4 var(--head);color:var(--blue)}details p{margin:8px 0 4px}
figure{margin:24px 0;max-width:68ch}figcaption{color:var(--mute);font-size:14px;margin-top:8px}
.diagram{background:#fff;border:1px solid var(--rule);padding:16px}
.diagram text{font-family:var(--sans);fill:var(--ink)}.diagram .dim{fill:var(--mute)}.diagram .ln{stroke:var(--ink)}
.diagram .acc{stroke:var(--margin)}.diagram .accf{fill:var(--margin)}.diagram .box{fill:#EEF3F8;stroke:var(--rule)}
.diagram.wide{overflow-x:auto}.diagram.wide svg{min-width:600px}
.two{display:grid;gap:28px;grid-template-columns:1fr}@media(min-width:900px){.two{grid-template-columns:1.4fr 1fr;align-items:start}}
dl.glossary{max-width:68ch}dl.glossary dt{font:700 18px/1.3 var(--head);color:var(--blue);margin-top:22px;scroll-margin-top:90px}dl.glossary dd{margin:4px 0 0}

.btn{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;font:700 16px/1 var(--head);padding:13px 20px;white-space:nowrap;box-shadow:3px 3px 0 var(--margin)}
.btn:hover{background:#16305A}
.cta{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;margin:64px 0 0;padding:22px 24px;background:#fff;border:1px solid var(--blue);box-shadow:4px 4px 0 var(--grid)}
.cta-k{margin:0;font:500 12px/1.2 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--margin)}
.cta-t{margin:6px 0 0;font-size:17px;max-width:58ch}

.useful{margin:44px auto 0;max-width:68ch;padding:14px 16px;border:1px dashed var(--blue);display:flex;flex-wrap:wrap;gap:10px;align-items:center;background:#fff}
.useful-q{margin:0;flex:1 1 200px;font:700 16px var(--head);color:var(--blue)}
.useful button{font:600 14px var(--sans);padding:7px 16px;border:2px solid var(--blue);background:#fff;color:var(--ink);cursor:pointer}
.useful button:hover{background:#EEF3F8}.useful-thanks{margin:0;color:var(--mute)}

.foot{background:var(--blue);color:#BDC9DC;padding:38px 0 44px;font-size:14.5px}
.fgrid{display:grid;gap:22px;grid-template-columns:1fr}@media(min-width:720px){.fgrid{grid-template-columns:1.3fr 1fr}}
.fname{font:700 19px/1.2 var(--head);color:#fff;margin:0 0 8px}
.fabout p{margin:0 0 6px}
.flinks{display:flex;flex-wrap:wrap;gap:6px 16px;align-content:start}
.flinks a,.legal a{color:#E4EAF4}
.disclose{border-top:1px solid #34507E;padding-top:16px;margin-top:22px;max-width:90ch}
.legal{margin:8px 0 0}
@media print{.top,.cta,.foot,.navtoggle,.useful{display:none}body{background:#fff}main.wrap::before{display:none}}