/* Engineer Aid — "the drawing sheet". Tokens and rules described in design.md. */
@font-face{font-family:"Plex Serif";src:url(/assets/fonts/ibm-plex-serif-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Plex Serif";src:url(/assets/fonts/ibm-plex-serif-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Plex Sans";src:url(/assets/fonts/ibm-plex-sans-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Plex Sans";src:url(/assets/fonts/ibm-plex-sans-latin-400-italic.woff2) format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"Plex Sans";src:url(/assets/fonts/ibm-plex-sans-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Plex Mono";src:url(/assets/fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Plex Mono";src:url(/assets/fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2");font-weight:500;font-display:swap}

:root{
  --paper:#F5F2EB;--sheet:#FFFDF8;--ink:#15181E;--ink-2:#4A505C;--rule:#D9D3C7;
  --blue:#1E3A5C;--blue-2:#E6ECF3;--red:#C8401E;--red-d:#A5331A;--green:#2F6B4F;
  --serif:"Plex Serif",Georgia,"Times New Roman",serif;
  --sans:"Plex Sans",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"Plex Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --w:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:16px}
body{margin:0;background:var(--paper);color:var(--ink);font:400 17px/1.6 var(--sans);
  background-image:linear-gradient(var(--rule) 1px,transparent 1px),linear-gradient(90deg,var(--rule) 1px,transparent 1px);
  background-size:32px 32px;background-attachment:fixed;background-position:-1px -1px}
body::before{content:"";position:fixed;inset:0;background:rgba(245,242,235,.86);pointer-events:none;z-index:-1}
a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--red)}
img,svg{max-width:100%}
.wrap{max-width:var(--w);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:var(--sheet);padding:8px 12px;z-index:10}
:focus-visible{outline:2px solid var(--red);outline-offset:2px}

/* header */
.top{background:var(--ink);color:#EDEAE2;border-bottom:3px solid var(--red)}
.top .wrap{display:flex;align-items:center;gap:20px;min-height:64px;flex-wrap:wrap}
.mark{display:inline-flex;align-items:stretch;border:1.5px solid #EDEAE2;text-decoration:none;color:#EDEAE2;font:500 14px/1 var(--mono);letter-spacing:.14em}
.mark span{padding:9px 10px}.mark span+span{border-left:1.5px solid #EDEAE2;background:#EDEAE2;color:var(--ink)}
.mark:hover{color:#fff}
.nav{display:flex;gap:2px;flex-wrap:wrap;margin-left:auto;align-items:center}
.nav a{color:#D6D2C8;text-decoration:none;font:500 13px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;padding:10px 10px}
.nav a:hover,.nav a[aria-current]{color:#fff;box-shadow:inset 0 -2px 0 var(--red)}
.nav .btn{margin-left:8px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--red);color:#fff !important;border:0;border-radius:2px;padding:11px 16px;font:600 15px/1.1 var(--sans);text-decoration:none;cursor:pointer;box-shadow:none !important}
.btn:hover{background:var(--red-d)}
.btn.ghost{background:transparent;color:var(--ink) !important;border:1.5px solid var(--ink)}
.btn.ghost:hover{background:var(--ink);color:#fff !important}
.btn.small{padding:8px 12px;font-size:14px}
.nav .btn{font:600 13px/1 var(--sans);text-transform:none;letter-spacing:0;padding:10px 14px}

/* title block */
.titleblock{padding:40px 0 8px}
.crumbs{font:400 13px/1.4 var(--mono);color:var(--ink-2);margin:0 0 18px}
.crumbs a{color:var(--ink-2)}
.crumbs span{margin:0 6px;color:var(--rule)}
.tb{display:grid;grid-template-columns:1fr 250px;border:1.5px solid var(--ink);background:var(--sheet)}
.tb-main{padding:28px 32px 30px}
.tb-side{border-left:1.5px solid var(--ink);display:grid;grid-template-rows:repeat(4,auto);font:400 12px/1.3 var(--mono);text-transform:uppercase;letter-spacing:.06em}
.tb-side div{padding:10px 14px;border-bottom:1px solid var(--rule)}
.tb-side div:last-child{border-bottom:0}
.tb-side b{display:block;font-weight:500;font-size:15px;letter-spacing:.02em;color:var(--ink);margin-top:3px;text-transform:none}
.tb-side .code b{color:var(--red)}
.kicker{font:500 12px/1.2 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--red);margin:0 0 12px}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.18;letter-spacing:-.005em;margin:0}
h1{font-size:41px;max-width:26ch}
.lede{font-size:19px;line-height:1.55;color:var(--ink-2);margin:16px 0 0;max-width:68ch}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}

/* key figures */
.figs{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));border:1.5px solid var(--ink);border-top:0;background:var(--blue-2)}
.fig{padding:16px 18px;border-right:1px solid #C7D1DD}
.fig:last-child{border-right:0}
.fig .v{font:500 26px/1.1 var(--mono);color:var(--blue);letter-spacing:-.01em}
.fig .l{font-size:14px;line-height:1.35;margin-top:6px;color:var(--ink)}
.fig .n{font:400 12px/1.3 var(--mono);color:var(--ink-2);margin-top:4px}

/* body grid */
.body{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;padding:40px 0 24px}
.article>section{margin:0 0 40px}
.article h2{font-size:28px;margin:0 0 14px;padding-top:14px;border-top:1.5px solid var(--ink);display:flex;gap:12px;align-items:baseline}
.article h2 .no{font:500 13px/1 var(--mono);color:var(--red);letter-spacing:.06em;flex:none}
.article h3{font-size:20px;margin:22px 0 8px}
.article p,.article li{max-width:70ch}
.article ul,.article ol{padding-left:22px}
.article li{margin:4px 0}
.article blockquote{margin:18px 0;padding:12px 18px;border-left:3px solid var(--red);background:var(--sheet);font-style:italic}
code{font:400 .88em/1.4 var(--mono);background:var(--blue-2);padding:1px 5px;border-radius:2px;color:var(--blue)}

/* ledgers */
.ledger{margin:20px 0;background:var(--sheet);border:1.5px solid var(--ink);overflow-x:auto}
.ledger table{border-collapse:collapse;width:100%;font-size:15px;min-width:520px}
.ledger caption{caption-side:top;text-align:left;font:500 12px/1.3 var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:10px 14px;border-bottom:1.5px solid var(--ink);color:var(--ink-2)}
.ledger th,.ledger td{padding:9px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--rule)}
.ledger thead th{font:500 12px/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;border-bottom:1.5px solid var(--ink);background:var(--paper)}
.ledger tbody tr:last-child td{border-bottom:0}
.ledger td.num{font-family:var(--mono);font-size:14px;text-align:right;white-space:nowrap}
.ledger tbody th{font-weight:600}

/* aside */
.aside{position:relative}
.aside-in{position:sticky;top:16px;display:flex;flex-direction:column;gap:16px}
.card{background:var(--sheet);border:1.5px solid var(--ink);padding:16px 18px}
.card h4{font:500 12px/1.2 var(--mono);letter-spacing:.1em;text-transform:uppercase;margin:0 0 10px;color:var(--ink-2)}
.toc ol{list-style:none;margin:0;padding:0;font-size:14px;counter-reset:t}
.toc li{counter-increment:t;padding:5px 0;border-bottom:1px solid var(--rule);display:flex;gap:8px}
.toc li::before{content:counter(t,decimal-leading-zero);font:500 12px/1.7 var(--mono);color:var(--red)}
.toc a{color:var(--ink);text-decoration:none}.toc a:hover{color:var(--red)}
.calc-card p{font-size:14px;margin:0 0 12px;color:var(--ink-2)}
.calc-card .t{font:600 17px/1.3 var(--serif);margin:0 0 6px;color:var(--ink)}
.presets{display:flex;flex-direction:column;gap:8px}
.preset{all:unset;cursor:pointer;display:block;border:1.5px solid var(--ink);padding:10px 12px;font:600 14px/1.35 var(--sans);background:var(--sheet)}
.preset::before{content:"→ ";color:var(--red)}
.preset:hover{background:var(--ink);color:#fff}
.preset:focus-visible{outline:2px solid var(--red);outline-offset:2px}

/* faq */
.faq{margin:8px 0 40px}
.faq h2{font-size:28px;padding-top:14px;border-top:1.5px solid var(--ink);margin:0 0 10px}
.faq details{border-bottom:1px solid var(--rule);background:transparent}
.faq summary{cursor:pointer;padding:14px 4px;font:600 17px/1.4 var(--sans);list-style:none;display:flex;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";font:500 18px/1.3 var(--mono);color:var(--red);width:14px;flex:none}
.faq details[open] summary::before{content:"–"}
.faq details p{margin:0 0 16px 26px;max-width:70ch;color:var(--ink-2)}

/* mesh */
.mesh{margin:0 0 48px}
.mesh h2{font-size:28px;padding-top:14px;border-top:1.5px solid var(--ink);margin:0 0 16px}
.mesh-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.sheet-link{display:block;background:var(--sheet);border:1px solid var(--ink);padding:14px 16px;text-decoration:none;color:var(--ink);transition:transform .08s}
.sheet-link:hover{color:var(--ink);box-shadow:4px 4px 0 var(--ink);transform:translate(-2px,-2px)}
.sheet-link .c{font:500 11px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--red)}
.sheet-link .h{display:block;font:600 16px/1.35 var(--serif);margin-top:8px}
.sheet-link .d{display:block;font-size:14px;color:var(--ink-2);margin-top:6px;line-height:1.45}

/* calculators */
.calc{border:1.5px solid var(--ink);background:var(--sheet);margin:28px 0}
.calc-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 16px;border-bottom:1.5px solid var(--ink);background:var(--ink);color:#EDEAE2;font:500 12px/1.3 var(--mono);letter-spacing:.1em;text-transform:uppercase}
.calc-head b{color:#fff;font-weight:500}
.calc-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr)}
.calc-in{padding:20px;border-right:1.5px solid var(--ink)}
.calc-out{padding:20px;background:var(--blue-2)}
.panel-label{font:500 11px/1 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2);margin:0 0 14px}
.field{margin:0 0 14px}
.field label,.field .lab{display:block;font:600 14px/1.3 var(--sans);margin:0 0 6px}
.field .hint{font:400 12px/1.3 var(--mono);color:var(--ink-2);margin-top:4px}
.field input,.field select,.field textarea{width:100%;font:400 16px/1.3 var(--sans);color:var(--ink);background:#fff;border:1.5px solid #9BA0A8;border-radius:2px;padding:9px 10px}
.field input[type=number]{font-family:var(--mono)}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--ink);outline:2px solid var(--blue-2)}
.field input[type=range]{padding:0;border:0;accent-color:var(--red);background:transparent}
.range-row{display:flex;gap:10px;align-items:center}.range-row output{font:500 14px/1 var(--mono);min-width:56px;text-align:right}
.two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.out-row{display:flex;justify-content:space-between;gap:16px;padding:9px 0;border-bottom:1px solid #C7D1DD;font-size:15px}
.out-row b{font:500 16px/1.3 var(--mono);white-space:nowrap;color:var(--blue)}
.out-row.big{border-bottom:1.5px solid var(--ink);padding:12px 0}
.out-row.big span{font-weight:600}
.out-row.big b{font-size:24px}
.out-row b.save{color:var(--green)}.out-row b.loss{color:var(--red)}
.out-cols{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin:4px 0 8px}
.opt{background:var(--sheet);border:1px solid #C7D1DD;padding:10px 12px}
.opt .k{font:500 11px/1.2 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2)}
.opt .v{font:500 20px/1.2 var(--mono);color:var(--blue);margin-top:4px}
.opt .s{font-size:12px;color:var(--ink-2);margin-top:2px;line-height:1.35}
.opt.best{border:1.5px solid var(--green)}.opt.best .k::after{content:" · lowest";color:var(--green)}
.plan{margin:14px 0 0;padding:0;list-style:none;counter-reset:p}
.plan li{counter-increment:p;padding:7px 0 7px 30px;position:relative;font-size:14px;line-height:1.45;border-bottom:1px dashed #C7D1DD}
.plan li::before{content:counter(p,decimal-leading-zero);position:absolute;left:0;top:8px;font:500 12px/1.4 var(--mono);color:var(--red)}
.flag{display:inline-block;font:500 11px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:5px 7px;border:1.5px solid currentColor;margin:2px 4px 2px 0}
.flag.r{color:var(--red)}.flag.g{color:var(--green)}.flag.b{color:var(--blue)}
.calc-actions{display:flex;gap:8px;flex-wrap:wrap;padding:14px 20px;border-top:1.5px solid var(--ink);background:var(--sheet)}
.calc-actions .note{font:400 12px/1.3 var(--mono);color:var(--ink-2);align-self:center;margin-left:auto}
.score{display:flex;align-items:center;gap:14px;margin:6px 0 10px}
.score .dial{font:500 34px/1 var(--mono);color:var(--blue)}
.bar{height:8px;background:#fff;border:1px solid #9BA0A8;flex:1}.bar i{display:block;height:100%;background:var(--blue)}
.checklist{margin:8px 0 0;padding:0;list-style:none}
.checklist li{padding:8px 0 8px 28px;position:relative;border-bottom:1px dashed #C7D1DD;font-size:14px;line-height:1.45}
.checklist li::before{content:"□";position:absolute;left:2px;top:6px;font:500 16px/1.2 var(--mono);color:var(--red)}
.brief-out{white-space:pre-wrap;font:400 13px/1.5 var(--mono);background:#fff;border:1px solid #9BA0A8;padding:12px;max-height:280px;overflow:auto}

/* dispatch */
.dispatch{background:var(--ink);color:#EDEAE2;margin:24px 0 0;padding:48px 0;border-top:3px solid var(--red)}
.dispatch .grid{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:48px}
.dispatch h2{font-size:33px;color:#fff}
.dispatch p{color:#C9C5BB;max-width:52ch}
.dispatch .kicker{color:#F08A6C}
.dispatch ul{padding-left:20px;color:#C9C5BB}
.dispatch ul li{margin:6px 0}
.dispatch form{background:var(--sheet);color:var(--ink);padding:24px;border:1.5px solid #EDEAE2}
.dispatch .field select,.dispatch .field input,.dispatch .field textarea{background:#fff}
.dispatch textarea{min-height:150px;resize:vertical;font-size:15px}
.hp{display:none !important}
.form-status{margin:12px 0 0;font-size:15px;min-height:1.4em}
.form-status.ok{color:var(--green);font-weight:600}.form-status.err{color:var(--red);font-weight:600}
.fine{font-size:13px;color:var(--ink-2);margin:10px 0 0}
.sync-flash{animation:flash 1.2s ease}
@keyframes flash{0%{box-shadow:0 0 0 0 rgba(200,64,30,.0)}20%{box-shadow:0 0 0 4px rgba(200,64,30,.55)}100%{box-shadow:0 0 0 0 rgba(200,64,30,0)}}

/* hub grids */
.hub{margin:8px 0 40px}
.hub-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.pillars{display:grid;grid-template-columns:repeat(5,1fr);border:1.5px solid var(--ink);background:var(--sheet);margin:28px 0}
.pillar{padding:18px;border-right:1px solid var(--rule);text-decoration:none;color:var(--ink)}
.pillar:last-child{border-right:0}
.pillar:hover{background:var(--blue-2);color:var(--ink)}
.pillar .c{font:500 11px/1 var(--mono);letter-spacing:.1em;color:var(--red)}
.pillar .h{display:block;font:600 17px/1.3 var(--serif);margin:8px 0 6px}
.pillar .d{display:block;font-size:14px;color:var(--ink-2);line-height:1.45}
.formula{font:400 14px/1.6 var(--mono);background:var(--sheet);border:1px dashed var(--ink-2);padding:12px 14px;overflow-x:auto;white-space:pre}
.state-filter{margin:0 0 12px;max-width:360px}

/* footer */
.foot{background:#0E1014;color:#A9A59C;padding:40px 0 28px;font-size:14px}
.foot .cols{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:28px}
.foot h4{font:500 12px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:#EDEAE2;margin:0 0 12px}
.foot a{color:#C9C5BB;text-decoration:none}.foot a:hover{color:#fff}
.foot ul{list-style:none;margin:0;padding:0}.foot li{margin:0 0 7px}
.foot .legal{border-top:1px solid #2A2E36;margin-top:28px;padding-top:16px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font:400 12px/1.5 var(--mono)}
.disclaimer{font-size:13px;color:var(--ink-2);border-top:1px solid var(--rule);padding-top:12px;margin-top:8px;max-width:80ch}

/* print brief: hidden on screen */
#brief{display:none}

@media (max-width:1040px){
  .body{grid-template-columns:1fr;gap:8px}
  .aside-in{position:static}
  .pillars{grid-template-columns:1fr 1fr}
  .pillar{border-bottom:1px solid var(--rule)}
  .foot .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  body{font-size:16px}
  h1{font-size:31px}
  .tb{grid-template-columns:1fr}
  .tb-side{border-left:0;border-top:1.5px solid var(--ink);grid-template-columns:1fr 1fr;grid-template-rows:auto}
  .tb-main{padding:22px 20px}
  .calc-grid{grid-template-columns:1fr}
  .calc-in{border-right:0;border-bottom:1.5px solid var(--ink)}
  .dispatch .grid{grid-template-columns:1fr;gap:24px}
  .two,.out-cols{grid-template-columns:1fr}
  .top .wrap{gap:8px;padding-top:10px}
  .nav{margin-left:0;flex-wrap:nowrap;overflow-x:auto;width:100%;-webkit-overflow-scrolling:touch}
  .nav a{white-space:nowrap;padding:10px 8px}
  .nav .btn{display:none}
  .titleblock{padding-top:20px}
  .pillars{grid-template-columns:1fr}
  .wrap{padding:0 16px}
  .article h2,.faq h2,.mesh h2{font-size:24px}
}

@media print{
  @page{margin:14mm}
  body{background:#fff !important;font-size:11pt}
  body::before{display:none}
  body.printing>*:not(#brief){display:none !important}
  body.printing #brief{display:block}
  body:not(.printing) .top,body:not(.printing) .dispatch,body:not(.printing) .foot,body:not(.printing) .aside,body:not(.printing) .calc-actions,body:not(.printing) .mesh{display:none !important}
  body:not(.printing) .body{display:block}
  #brief{color:#000;font-family:var(--sans)}
  #brief .bh{border:2px solid #000;display:flex;justify-content:space-between;padding:10px 14px;font:500 10pt/1.3 var(--mono);letter-spacing:.06em}
  #brief .bh b{font-size:12pt}
  #brief h1{font-size:20pt;margin:16px 0 4px;max-width:none}
  #brief .meta{font:400 9pt/1.4 var(--mono);color:#333;margin:0 0 12px}
  #brief h2{font:600 12pt/1.3 var(--serif);border-top:1.5px solid #000;padding-top:6px;margin:16px 0 6px}
  #brief table{width:100%;border-collapse:collapse;font-size:10pt}
  #brief td{border-bottom:1px solid #bbb;padding:5px 6px;vertical-align:top}
  #brief td.n{text-align:right;font-family:var(--mono);white-space:nowrap}
  #brief ol{margin:4px 0;padding-left:20px;font-size:10pt}
  #brief .bf{margin-top:18px;border-top:1px solid #000;padding-top:6px;font:400 8pt/1.4 var(--mono);color:#333}
}