:root{--ink:#142333;--muted:#647383;--blue:#1769aa;--cyan:#29a6d8;--line:#d9e3ea;--paper:#f5f8fa;--white:#fff;--dark:#0d1720}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,Arial,sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:inherit;text-decoration:none}.container{width:min(1180px,92%);margin:auto}.top{background:#0d1720;color:#b9c9d6;font-size:13px;padding:8px 0}.top .container{display:flex;justify-content:space-between}
header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.nav{min-height:76px;display:flex;align-items:center;gap:28px}.logo{font-weight:900;font-size:25px;letter-spacing:-1px}.logo span{color:var(--blue)}nav{display:flex;gap:20px;flex:1;justify-content:center}nav a{font-size:14px;font-weight:700}nav a:hover{color:var(--blue)}
.btn{display:inline-block;background:var(--blue);color:#fff;padding:12px 18px;border-radius:5px;font-weight:800}.btn.alt{background:#fff;color:var(--blue);border:1px solid #9bbbd0}
.hero{min-height:620px;display:grid;place-items:center;background:linear-gradient(90deg,rgba(7,17,26,.92),rgba(7,17,26,.48)),url("https://images.unsplash.com/photo-1503387762-592deb58ef4e?auto=format&fit=crop&w=1800&q=85") center/cover;color:#fff}.hero h1{font-size:clamp(42px,6vw,78px);line-height:1.02;max-width:850px;margin:14px 0}.eyebrow{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:#7fd5f4;font-weight:900}
section{padding:78px 0}.section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}.section-head h2{font-size:36px;line-height:1.1;margin:0}.lead{color:var(--muted);max-width:700px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.card{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden}.card img{width:100%;height:220px;object-fit:cover;display:block}.cardbody{padding:22px}.card h3{margin:0 0 8px;font-size:21px}.tag{display:inline-block;font-size:11px;text-transform:uppercase;letter-spacing:1px;color:var(--blue);font-weight:900;margin-bottom:8px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);background:#fff;border:1px solid var(--line);border-radius:8px}.stat{padding:26px;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat strong{display:block;font-size:30px}
.blueprint{background:#eaf4f8;border-top:1px solid #c6dbe4;border-bottom:1px solid #c6dbe4}.drawing{background:#fafdff;border:1px solid #b9d1dc;padding:22px;border-radius:8px}.layers{max-width:700px;margin:20px auto}.layer{padding:16px;border:1px solid #a8c5d2;margin:0 0 5px;text-align:center;font-weight:800}.l1{background:#d9c8a9}.l2{background:#e8edf0}.l3{background:#f3e0a8}.l4{background:#c9d8de}.l5{background:#fff}
.photo-wide{height:420px;object-fit:cover;width:100%;border-radius:8px}.article{background:#fff;padding:42px;border:1px solid var(--line);border-radius:8px}.article h1{font-size:46px;line-height:1.1}.article h2{margin-top:38px}
table{width:100%;border-collapse:collapse;background:#fff}th,td{padding:14px;border:1px solid var(--line);text-align:left}th{background:#edf4f7}
footer{background:#0d1720;color:#b9c9d6;padding:60px 0}.footergrid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}.footerlogo{color:#fff;font-size:25px;font-weight:900}
input,select{padding:13px;border:1px solid #bccbd5;border-radius:5px;width:100%;font:inherit}.calc{background:#fff;padding:28px;border:1px solid var(--line);border-radius:8px;max-width:760px}.row{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:12px 0}.result{background:#edf7fb;padding:20px;border-left:4px solid var(--blue);margin-top:18px}
@media(max-width:850px){nav{display:none}.grid,.grid4,.stats,.footergrid{grid-template-columns:1fr 1fr}.hero{min-height:520px}.section-head{display:block}.row{grid-template-columns:1fr}}
@media(max-width:560px){.grid,.grid4,.stats,.footergrid{grid-template-columns:1fr}.stat{border-right:0;border-bottom:1px solid var(--line)}.hero h1{font-size:42px}.article{padding:24px}}