:root{
  --navy:#06182a;
  --navy-2:#0b2238;
  --gold:#d79a35;
  --ink:#0b1630;
  --muted:#637083;
  --paper:#f6f7f9;
  --white:#ffffff;
  --line:#dfe4ea;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Arial,Helvetica,sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
}
a{text-decoration:none;color:inherit}
.container{width:min(1180px,92%);margin:0 auto}
.site-header{
  position:sticky;top:0;z-index:20;
  background:rgba(6,24,42,.96);
  border-bottom:1px solid rgba(255,255,255,.08);
  backdrop-filter:blur(10px);
}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  min-height:78px;
}
.brand{display:flex;flex-direction:column;line-height:1}
.brand strong{color:#fff;font-size:2rem;letter-spacing:.06em}
.brand span{color:var(--gold);font-size:.7rem;letter-spacing:.35em;margin-top:.35rem}
.nav-links{display:flex;gap:1.55rem;color:#fff;font-size:.88rem}
.nav-links a{opacity:.88;position:relative;padding-bottom:.5rem;font-weight:500;transition:all .2s ease}
.nav-links a:hover,.nav-links a.active{color:var(--gold);opacity:1}
.nav-links a.active{font-weight:700}
.nav-links a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:3px;
  background:var(--gold);border-radius:999px;
}
.menu-btn{display:none;background:none;border:0;color:#fff;font-size:1.5rem}
.hero{
  background:
    linear-gradient(90deg,rgba(6,24,42,.98) 0%,rgba(6,24,42,.93) 42%,rgba(6,24,42,.30) 72%,rgba(6,24,42,.10) 100%),
    url('assets/engine-blueprint.jpg') center right/cover no-repeat;
  color:#fff;
  min-height:650px;
  display:flex;align-items:center;
}
.hero-content{max-width:560px;padding:110px 0}
.eyebrow{color:var(--gold);text-transform:uppercase;letter-spacing:.22em;font-size:.8rem}
h1{font-size:clamp(3rem,6vw,5.5rem);line-height:.98;margin:.5rem 0 1.3rem}
.hero h1 span{color:var(--gold)}
.hero h2{font-size:clamp(1.4rem,2.4vw,2.1rem);font-weight:500;max-width:520px;margin:0 0 1.5rem}
.hero p{font-size:1.1rem;color:#f0b45a;max-width:520px}
.section{padding:90px 0}
.section.white{background:#fff}
.section.dark{background:var(--navy);color:#fff}
.section-title{font-size:2rem;margin:0 0 1rem}
.section-title:after{content:"";display:block;width:42px;height:3px;background:var(--gold);margin-top:.8rem}
.lead{font-size:1.08rem;color:var(--muted);max-width:850px}
.dark .lead{color:#c5cfda}
.grid-2{display:grid;grid-template-columns:1.05fr .95fr;gap:4rem;align-items:start}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem;margin-top:2rem}
.card{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:1.5rem;
  box-shadow:0 8px 30px rgba(8,23,42,.05);
}
.dark .card{background:var(--navy-2);border-color:rgba(255,255,255,.08)}
.card h3{margin:.2rem 0 .6rem}
.card p{margin:0;color:var(--muted)}
.dark .card p{color:#c6d0dc}
.feature-list{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.13);margin-top:2rem}
.feature{background:var(--navy);padding:2rem}
.feature h3{color:var(--gold);margin:0 0 .5rem}
.cta{
  display:flex;justify-content:space-between;align-items:center;gap:2rem;
  background:var(--navy);color:#fff;padding:2rem;border-radius:16px;margin-top:2rem
}
.btn{
  display:inline-block;background:var(--gold);color:var(--navy);
  padding:.85rem 1.2rem;border-radius:8px;font-weight:700
}
.page-hero{
  background:
    linear-gradient(90deg,rgba(6,24,42,.96) 0%,rgba(6,24,42,.91) 48%,rgba(6,24,42,.78) 100%),
    url('assets/engine-blueprint.jpg') center right/cover no-repeat;
  color:#fff;padding:110px 0 80px;
}
.page-hero h1{font-size:clamp(2.7rem,5vw,4.5rem);margin:0 0 1rem}
.content{max-width:880px}
.content p{font-size:1.08rem;margin:0 0 1.25rem}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem}
.contact-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:2rem}
footer{background:#03111f;color:#fff;padding:2.2rem 0}
.footer-inner{display:flex;justify-content:space-between;gap:2rem;align-items:flex-start}
.footer-copy{color:#a8b5c4;font-size:.9rem;max-width:560px}
.small{font-size:.86rem;color:#8795a6}
@media(max-width:900px){
  .nav-links{display:none;position:absolute;top:78px;left:0;right:0;background:var(--navy);padding:1.5rem;flex-direction:column}
  .nav-links.open{display:flex}
  .menu-btn{display:block}
  .hero{background-position:62% center;min-height:580px}
  .hero-content{padding:90px 0;max-width:500px}
  .grid-2,.contact-grid{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .feature-list{grid-template-columns:1fr 1fr}
  .footer-inner{flex-direction:column}
}
@media(max-width:560px){
  .hero{background:
    linear-gradient(rgba(6,24,42,.92),rgba(6,24,42,.92)),
    url('assets/engine-blueprint.jpg') center/cover no-repeat;}
  .feature-list{grid-template-columns:1fr}
  .section{padding:65px 0}
}

address{font-style:normal;margin:0 0 1.25rem}
.contact-actions{margin:1.35rem 0 1.55rem}
.footer-contact p{margin:.25rem 0}
.footer-contact a:hover{color:var(--gold)}