/* BlueSteelRacing — Apple-inspired design system */

:root{
  --black:#1d1d1f;
  --gray-900:#1d1d1f;
  --gray-700:#424245;
  --gray-500:#6e6e73;
  --gray-300:#d2d2d7;
  --gray-100:#f5f5f7;
  --white:#ffffff;
  --blue:#0071e3;
  --blue-dark:#0058b0;
  --red:#ff3b30;
  --max:1100px;
  --radius:18px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--gray-900);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  line-height:1.5;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}

.wrap{max-width:var(--max);margin:0 auto;padding:0 24px;}

/* NAV */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,0.8);
  backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(0,0,0,0.06);
}
.nav-inner{
  max-width:var(--max);margin:0 auto;padding:0 24px;
  height:52px;display:flex;align-items:center;justify-content:space-between;
}
.nav-logo{font-size:17px;font-weight:600;letter-spacing:-0.01em;}
.nav-logo span{color:var(--blue);}
.nav-links{display:flex;gap:28px;list-style:none;margin:0;padding:0;}
.nav-links a{font-size:13px;color:var(--gray-900);opacity:0.9;transition:opacity .2s;}
.nav-links a:hover{opacity:1;color:var(--blue);}
.nav-cta{
  font-size:13px;background:var(--gray-900);color:var(--white);
  padding:7px 16px;border-radius:980px;transition:background .2s;
}
.nav-cta:hover{background:var(--blue);}

/* HERO */
.hero{
  text-align:center;
  padding:120px 24px 80px;
  background:linear-gradient(180deg,#fbfbfd,#ffffff);
}
.eyebrow{
  font-size:14px;font-weight:600;color:var(--blue);
  text-transform:uppercase;letter-spacing:0.08em;margin-bottom:16px;
}
.hero h1{
  font-size:clamp(34px,6vw,64px);
  font-weight:700;letter-spacing:-0.02em;
  margin:0 0 20px;line-height:1.05;
}
.hero p.lead{
  font-size:clamp(17px,2.2vw,24px);
  color:var(--gray-500);max-width:680px;margin:0 auto 36px;
  font-weight:400;
}
.btn-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;}
.btn{
  display:inline-block;padding:14px 28px;border-radius:980px;
  font-size:16px;font-weight:500;transition:transform .15s, background .2s;
}
.btn-primary{background:var(--blue);color:#fff;}
.btn-primary:hover{background:var(--blue-dark);}
.btn-secondary{background:var(--gray-100);color:var(--gray-900);}
.btn-secondary:hover{background:var(--gray-300);}

/* SECTIONS */
section{padding:96px 0;}
.section-tight{padding:64px 0;}
.section-alt{background:var(--gray-100);}
h2.section-title{
  font-size:clamp(28px,4vw,42px);font-weight:700;letter-spacing:-0.02em;
  text-align:center;margin:0 0 12px;
}
p.section-sub{
  text-align:center;color:var(--gray-500);font-size:19px;
  max-width:640px;margin:0 auto 56px;
}

/* GRID CARDS */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
@media (max-width:860px){.grid-3,.grid-2{grid-template-columns:1fr;}}

.card{
  background:var(--white);border-radius:var(--radius);
  padding:36px 28px;border:1px solid rgba(0,0,0,0.06);
  transition:transform .25s ease, box-shadow .25s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 40px rgba(0,0,0,0.08);}
.card .icon{font-size:32px;margin-bottom:18px;}
.card h3{font-size:20px;margin:0 0 10px;letter-spacing:-0.01em;}
.card p{color:var(--gray-500);font-size:15px;margin:0;}

/* ARTICLE / CASE STUDY CARDS */
.article-card{
  display:block;border-radius:var(--radius);overflow:hidden;
  background:var(--gray-100);border:1px solid rgba(0,0,0,0.06);
  transition:transform .25s ease, box-shadow .25s ease;
}
.article-card:hover{transform:translateY(-4px);box-shadow:0 20px 40px rgba(0,0,0,0.08);}
.article-card img{width:100%;height:220px;object-fit:cover;background:#e5e5e7;}
.article-card .ac-body{padding:24px 26px 30px;}
.article-card .ac-tag{font-size:12px;font-weight:600;color:var(--blue);text-transform:uppercase;letter-spacing:.06em;}
.article-card h3{font-size:21px;margin:10px 0 8px;letter-spacing:-0.01em;}
.article-card p{color:var(--gray-500);font-size:15px;margin:0;}

/* STATS */
.stats{display:flex;justify-content:center;gap:64px;flex-wrap:wrap;text-align:center;}
.stat strong{display:block;font-size:42px;font-weight:700;letter-spacing:-0.02em;}
.stat span{color:var(--gray-500);font-size:14px;}

/* CTA BANNER */
.cta-banner{
  text-align:center;background:var(--gray-900);color:var(--white);
  border-radius:28px;padding:72px 32px;margin:0 24px;
}
.cta-banner h2{font-size:clamp(26px,4vw,38px);margin:0 0 14px;letter-spacing:-0.02em;}
.cta-banner p{color:#a1a1a6;font-size:18px;margin:0 0 32px;}
.cta-banner .btn-primary{background:var(--white);color:var(--gray-900);}
.cta-banner .btn-primary:hover{background:var(--gray-300);}

/* FOOTER */
footer{padding:48px 0 32px;border-top:1px solid var(--gray-300);background:var(--gray-100);}
.footer-cols{display:flex;justify-content:space-between;flex-wrap:wrap;gap:32px;margin-bottom:32px;}
.footer-col h4{font-size:13px;margin:0 0 12px;color:var(--gray-900);}
.footer-col ul{list-style:none;margin:0;padding:0;}
.footer-col li{margin-bottom:8px;}
.footer-col a{font-size:13px;color:var(--gray-500);}
.footer-col a:hover{color:var(--blue);}
.footer-bottom{font-size:12px;color:var(--gray-500);border-top:1px solid var(--gray-300);padding-top:20px;}

/* ARTICLE PAGE TYPOGRAPHY */
.article-hero{padding:64px 0 32px;text-align:center;}
.breadcrumb{font-size:13px;color:var(--gray-500);margin-bottom:20px;}
.breadcrumb a{color:var(--blue);}
.article-meta{color:var(--gray-500);font-size:14px;margin-top:8px;}
.article-cover{margin:32px auto;max-width:var(--max);border-radius:var(--radius);overflow:hidden;}
.article-cover img{width:100%;height:auto;}
.prose{max-width:720px;margin:0 auto;padding:0 24px;font-size:18px;color:var(--gray-700);}
.prose h2{font-size:28px;color:var(--gray-900);letter-spacing:-0.01em;margin:48px 0 16px;}
.prose h3{font-size:22px;color:var(--gray-900);margin:36px 0 12px;}
.prose p{margin:0 0 20px;}
.prose ul{margin:0 0 20px;padding-left:22px;}
.prose li{margin-bottom:8px;}
.prose .gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:32px 0;}
.prose .gallery img{border-radius:14px;width:100%;height:240px;object-fit:cover;background:#e5e5e7;}
.prose figcaption{font-size:13px;color:var(--gray-500);text-align:center;margin-top:8px;}
.inline-cta{
  background:var(--gray-100);border-radius:var(--radius);padding:32px;
  text-align:center;margin:48px 0;
}
.inline-cta p{margin:0 0 18px;font-size:17px;}

@media (max-width:640px){
  .prose .gallery{grid-template-columns:1fr;}
  .footer-cols{flex-direction:column;}
  .cta-banner{margin:0 16px;padding:56px 20px;}
}