/* Steel Estimator Pro — shared styles for content pages (hubs, guides, articles) */
:root{
  --bg:#0d0f12;--bg-2:#14171c;--panel:#181c22;--panel-2:#1f242c;--line:#2a313a;--line-2:#39424e;
  --ink:#eef2f6;--ink-2:#aeb8c4;--ink-3:#77828f;--molten:#ff6a1a;--molten-2:#ff8c42;--ok:#4ec58a;
  --radius:14px;--maxw:1120px;--maxw-read:760px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"SF Mono",ui-monospace,"Cascadia Code",Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.read{max-width:var(--maxw-read);margin:0 auto;padding:0 24px}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--molten-2);margin-bottom:18px}

/* nav */
header{position:sticky;top:0;z-index:50;background:rgba(13,15,18,.82);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
nav{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 24px}
.brand{display:flex;align-items:center;gap:11px;font-weight:700;letter-spacing:-.01em}
.brand .mark{width:30px;height:30px;flex:0 0 auto;display:grid;place-items:center;background:linear-gradient(135deg,var(--molten),#c1420a);border-radius:7px;box-shadow:0 0 18px rgba(255,106,26,.35)}
.brand .mark svg{width:17px;height:17px;display:block}
.brand small{display:block;font-weight:500;font-size:11px;color:var(--ink-3);letter-spacing:.04em}
.nav-links{display:flex;gap:28px;align-items:center;font-size:14px;color:var(--ink-2)}
.nav-links a:hover{color:var(--ink)}
.nav-cta{padding:9px 18px;border-radius:8px;background:var(--molten);color:#0d0f12;font-weight:650;font-size:14px}
@media(max-width:760px){.nav-links{display:none}}

.crumb{font-size:13px;color:var(--ink-3);padding:20px 0 0}
.crumb a:hover{color:var(--molten-2)}

/* hero */
.hero{position:relative;padding:56px 0 60px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;z-index:0;background:radial-gradient(680px 340px at 78% -8%,rgba(255,106,26,.16),transparent 60%)}
.hero .wrap,.hero .read{position:relative;z-index:1}
.hero h1{font-size:clamp(32px,5vw,54px);line-height:1.06;letter-spacing:-.03em;font-weight:800;max-width:20ch}
.hero h1 .hl{background:linear-gradient(120deg,var(--molten-2),var(--molten));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{margin-top:22px;font-size:clamp(16px,2vw,20px);color:var(--ink-2);max-width:62ch}
.hero-cta{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:14px 26px;border-radius:10px;font-weight:650;font-size:15px;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}
.btn-primary{background:var(--molten);color:#0d0f12}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 34px rgba(255,106,26,.34)}
.btn-ghost{border:1px solid var(--line-2);color:var(--ink)}
.btn-ghost:hover{border-color:var(--molten);color:var(--molten-2)}

/* sections + cards */
section{padding:72px 0}
.sec-head{max-width:62ch;margin-bottom:40px}
.sec-head h2{font-size:clamp(26px,4vw,40px);letter-spacing:-.025em;line-height:1.12;font-weight:800}
.sec-head p{margin-top:16px;font-size:17px;color:var(--ink-2)}
.fgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.fgrid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.fgrid{grid-template-columns:1fr}}
.card{background:linear-gradient(180deg,var(--panel),var(--bg-2));border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;transition:transform .18s ease,border-color .18s ease}
.card h3{font-size:17px;letter-spacing:-.01em;margin-bottom:9px}
.card p{font-size:14px;color:var(--ink-2);line-height:1.62}
a.card:hover{transform:translateY(-4px);border-color:var(--line-2)}
.card .tag{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--molten-2);display:block;margin-bottom:12px}
.card .more{color:var(--molten-2);font-size:13.5px;font-weight:600;margin-top:14px;display:inline-block}

/* article prose */
.prose{color:var(--ink-2);font-size:17px}
.prose .lead{font-size:20px;color:var(--ink);margin:0 0 8px}
.prose h2{color:var(--ink);font-size:clamp(22px,3vw,30px);letter-spacing:-.02em;margin:44px 0 14px;font-weight:800}
.prose h3{color:var(--ink);font-size:19px;margin:28px 0 10px;font-weight:700}
.prose p{margin:0 0 18px}
.prose ul,.prose ol{margin:0 0 18px;padding-left:22px}
.prose li{margin:0 0 9px}
.prose strong{color:var(--ink)}
.prose a{color:var(--molten-2);text-decoration:underline;text-underline-offset:2px}
.prose blockquote{border-left:3px solid var(--molten);background:var(--bg-2);padding:14px 20px;border-radius:0 8px 8px 0;margin:0 0 22px;color:var(--ink)}
.prose .tbl{overflow-x:auto;margin:0 0 22px;border:1px solid var(--line);border-radius:10px}
.prose table{width:100%;min-width:520px;border-collapse:collapse;font-size:14.5px}
.prose th,.prose td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line)}
.prose thead th{background:var(--bg-2);color:var(--ink-3);font-size:12px;text-transform:uppercase;letter-spacing:.03em}
.prose td:first-child{color:var(--ink);font-weight:600}
.prose .src{font-size:13px;color:var(--ink-3);font-style:italic}
.meta{font-size:13px;color:var(--ink-3);font-family:var(--mono);margin-bottom:26px}
.steps{counter-reset:step;list-style:none;padding:0}
.steps>li{position:relative;padding:0 0 22px 52px;margin:0}
.steps>li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:-2px;width:34px;height:34px;border-radius:9px;background:var(--panel-2);border:1px solid var(--line-2);color:var(--molten-2);font-weight:700;font-family:var(--mono);display:grid;place-items:center}
.steps h3{margin-top:0}

/* callout to app */
.appcta{border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(120deg,var(--panel),var(--bg-2));padding:28px;margin:40px 0 0}
.appcta h3{font-size:19px;margin-bottom:8px}
.appcta p{color:var(--ink-2);font-size:15px;margin-bottom:18px}

/* cta + footer */
.cta{text-align:center;background:radial-gradient(600px 300px at 50% 0,rgba(255,106,26,.12),transparent 60%)}
.cta h2{font-size:clamp(28px,4.5vw,44px);letter-spacing:-.03em;font-weight:800;max-width:20ch;margin:0 auto}
.cta p{margin:18px auto 30px;color:var(--ink-2);font-size:17px;max-width:54ch}
footer{border-top:1px solid var(--line);padding:40px 0;color:var(--ink-3);font-size:13.5px}
footer .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:18px}
footer .fnav{display:flex;gap:20px;flex-wrap:wrap}
footer .fnav a:hover{color:var(--molten-2)}
footer .brand small{color:var(--ink-3)}