/* shared styles for engine detail pages — mirrors the homepage system */
:root{
  --bg:#090d10;--bg-2:#0e1418;--surface:#121a1f;--surface-2:#172229;
  --line:#22303a;--line-2:#2d3f4b;--ink:#e8f0f2;--ink-2:#93a7ae;--ink-3:#64787f;
  --accent:#5fd4cf;--accent-dim:#2b7a79;--accent-glow:rgba(95,212,207,.13);
  --accent2:#edab5e;--accent2-dim:#8a6130;--accent2-glow:rgba(237,171,94,.14);
  --display:"Archivo",-apple-system,BlinkMacSystemFont,"Helvetica Neue",sans-serif;
  --sans:"IBM Plex Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --gutter:clamp(20px,5vw,48px);--maxw:1000px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
.shell{max-width:var(--maxw);margin:0 auto;padding-inline:var(--gutter)}
a{color:inherit}
h1,h2,h3{font-family:var(--display);letter-spacing:-.025em;margin:0;text-wrap:balance}
p{margin:0}
.eyebrow{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.18em;
  text-transform:uppercase;color:var(--accent)}
.nav{position:sticky;top:0;z-index:50;background:rgba(9,13,16,.9);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);padding-block:10px}
.nav-in{display:flex;align-items:center;gap:22px}
.brand{font-family:var(--display);font-weight:800;font-size:17px;letter-spacing:-.03em;
  text-decoration:none;margin-right:auto;display:flex;align-items:center;gap:10px}
.brand .mark{width:40px;height:40px;object-fit:contain;flex:0 0 auto;
  filter:drop-shadow(0 0 12px rgba(95,212,207,.3))}
.brand .wm{display:inline}
.brand .tld{color:var(--accent2)}
.nav a.link{font-size:14px;color:var(--ink-2);text-decoration:none}
.nav a.link:hover{color:var(--ink)}
.btn{display:inline-block;font-weight:600;font-size:15px;padding:13px 24px;border-radius:3px;
  text-decoration:none;background:var(--accent);color:#06100f;border:1px solid var(--accent)}
.btn:hover{background:#7ee3de;border-color:#7ee3de}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn.ghost:hover{background:var(--surface-2);border-color:var(--accent-dim)}
.nav .btn{padding:8px 15px;font-size:13.5px}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media (max-width:720px){.nav a.link{display:none}}

.back{display:inline-flex;gap:8px;align-items:center;font-family:var(--mono);font-size:12px;
  color:var(--ink-3);text-decoration:none;letter-spacing:.05em;margin-bottom:22px}
.back:hover{color:var(--accent)}

.head{padding-block:clamp(38px,7vw,70px) clamp(30px,5vw,48px);border-bottom:1px solid var(--line);
  position:relative;overflow:hidden}
.head::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(60% 90% at 78% 0%,var(--accent-glow),transparent 70%)}
.head .shell{position:relative;z-index:1}
.head h1{font-size:clamp(30px,5.6vw,52px);line-height:1.04;font-weight:800;margin:14px 0 0}
.head .tag{font-size:clamp(16px,2vw,19px);color:var(--ink-2);max-width:58ch;margin-top:18px}

section.band{padding-block:clamp(44px,6vw,72px);border-bottom:1px solid var(--line)}
section.band h2{font-size:clamp(23px,3.4vw,32px);line-height:1.12;font-weight:700;margin-bottom:10px}
section.band .lede{color:var(--ink-2);font-size:16px;max-width:62ch;margin-bottom:28px}

.twocol{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media (max-width:760px){.twocol{grid-template-columns:1fr}}
.pane{background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:24px}
.pane.sol{border-left:2px solid var(--accent)}
.pane h3{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.15em;
  text-transform:uppercase;color:var(--ink-3);margin-bottom:12px}
.pane.sol h3{color:var(--accent)}
.pane p{color:var(--ink-2);font-size:15px;line-height:1.62}

.pipe{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:28px;
  background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:18px}
.pipe .node{font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;color:var(--ink);
  background:var(--surface-2);border:1px solid var(--line-2);border-radius:3px;padding:7px 11px}
.pipe .node:last-child{border-color:var(--accent-dim);color:var(--accent)}
.pipe .arr{color:var(--ink-3);font-size:13px}

.stages{display:flex;flex-direction:column;list-style:none;padding:0;margin:0 0 0 6px;
  border-left:1px solid var(--line-2)}
.stages li{position:relative;padding:0 0 24px 30px}
.stages li:last-child{padding-bottom:0}
.stages li::before{content:"";position:absolute;left:-5px;top:7px;width:9px;height:9px;
  border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--bg)}
.stages h3{font-size:16.5px;font-weight:600;margin-bottom:5px}
.stages p{color:var(--ink-2);font-size:14.5px;max-width:62ch}

.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips span{font-family:var(--mono);font-size:12px;color:var(--ink-2);
  border:1px solid var(--line);border-radius:3px;padding:7px 11px;background:var(--surface)}

/* impact model */
.model{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
@media (max-width:860px){.model{grid-template-columns:1fr}}
.controls{background:var(--surface);border:1px solid var(--line);border-radius:5px;padding:22px}
.ctl{display:grid;grid-template-columns:1fr auto;gap:6px 14px;align-items:center;
  padding-block:11px;border-bottom:1px solid var(--line)}
.ctl:last-of-type{border-bottom:none}
.ctl label{font-size:14px;color:var(--ink-2);line-height:1.4}
.ctl .val{font-family:var(--mono);font-size:14px;color:var(--accent);font-weight:600;
  text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.ctl input[type=range]{grid-column:1/-1;width:100%;accent-color:var(--accent);margin:0}
.result{background:linear-gradient(180deg,rgba(95,212,207,.1),rgba(95,212,207,.02));
  border:1px solid var(--accent-dim);border-radius:5px;padding:24px;position:sticky;top:76px}
@media (max-width:860px){.result{position:static}}
.result .big{font-family:var(--display);font-size:clamp(32px,5.4vw,46px);font-weight:800;
  letter-spacing:-.03em;line-height:1;color:var(--ink);font-variant-numeric:tabular-nums}
.result .cap{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);margin-bottom:10px}
.rows{margin-top:20px;border-top:1px solid var(--line-2);padding-top:16px;
  display:flex;flex-direction:column;gap:9px}
.row{display:flex;justify-content:space-between;gap:14px;font-size:14px}
.row span:first-child{color:var(--ink-2)}
.row span:last-child{font-family:var(--mono);color:var(--ink);font-variant-numeric:tabular-nums}
.assume{margin-top:22px;background:var(--surface);border:1px solid var(--line);
  border-radius:5px;padding:18px 20px}
.assume h3{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);margin-bottom:11px}
.assume ul{margin:0;padding-left:18px;display:flex;flex-direction:column;gap:7px}
.assume li{color:var(--ink-2);font-size:13.5px;line-height:1.55}
.caveat{margin-top:14px;font-size:13px;color:var(--ink-3);font-style:italic}

.cta{padding-block:clamp(46px,7vw,76px);text-align:center;position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(55% 80% at 50% 115%,var(--accent-glow),transparent 70%)}
.cta .shell{position:relative;z-index:1}
.cta h2{font-size:clamp(24px,4vw,36px);font-weight:800;line-height:1.1;margin:12px auto 0;max-width:20ch}
.cta p{color:var(--ink-2);max-width:52ch;margin:16px auto 0}
.cta .btn{margin-top:26px}
footer{padding-block:30px;font-size:13px;color:var(--ink-3);border-top:1px solid var(--line)}
.foot-in{display:flex;flex-wrap:wrap;gap:12px 26px;align-items:center}
.foot-in .brand{font-size:15px;margin-right:auto}
.foot-in .brand .mark{width:32px;height:32px}
footer a{color:var(--ink-2);text-decoration:none}
footer a:hover{color:var(--accent)}

.hard{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:800px){.hard{grid-template-columns:1fr}}
.hard .item{background:var(--surface);border:1px solid var(--line);border-radius:5px;
  padding:20px 22px;border-top:2px solid var(--accent-dim)}
.hard .item h3{font-size:15.5px;font-weight:600;margin-bottom:8px;letter-spacing:-.01em}
.hard .item p{color:var(--ink-2);font-size:14px;line-height:1.6}

/* second accent: outcomes and proof, so colour means something */
.out{background:linear-gradient(180deg,rgba(237,171,94,.12),rgba(237,171,94,.02))!important;
  border-color:var(--accent2-dim)!important}
.out .cap{color:var(--accent2)!important}