:root{--dark:#10263f;--accent:#48a9c5;--light:#eef7fa;--white:#fff;--text:#20252a}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:#fff;line-height:1.65}
a{color:inherit;text-decoration:none}img{max-width:100%;display:block}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);box-shadow:0 5px 24px rgba(0,0,0,.08)}
.topbar{max-width:1180px;margin:auto;padding:16px 22px;display:flex;align-items:center;gap:25px}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;color:var(--dark);font-size:20px}.logo small{display:block;font-size:11px;letter-spacing:2px;text-transform:uppercase;color:#667}
.logo-mark{width:46px;height:46px;border-radius:999px;display:grid;place-items:center;background:var(--accent);color:white}
.contact-mini{margin-left:auto;text-align:right;font-size:14px}.contact-mini a{font-weight:800;color:var(--dark)}
nav{display:flex;gap:10px}nav a{padding:11px 18px;border-radius:999px;background:var(--light);font-weight:700;transition:.25s}nav a:hover,nav a.active{background:var(--dark);color:white;transform:translateY(-2px)}
.menu-toggle{display:none;border:0;background:var(--dark);color:#fff;border-radius:16px;padding:10px 14px;font-size:22px}
.hero{min-height:72vh;display:grid;place-items:center;position:relative;background:url('photos/chantier-1.jpg') center/cover no-repeat;color:#fff}
.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.78),rgba(0,0,0,.2))}
.hero-inner{position:relative;max-width:1180px;width:100%;padding:80px 24px}.hero h1{font-size:clamp(38px,6vw,76px);line-height:1.02;max-width:850px;margin:0 0 20px}
.hero p{font-size:20px;max-width:700px}.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}
.btn{display:inline-block;padding:15px 24px;border-radius:999px;font-weight:800;background:var(--accent);color:#fff}.btn.alt{background:#fff;color:var(--dark)}
section{padding:80px 24px}.wrap{max-width:1180px;margin:auto}.eyebrow{color:var(--accent);font-weight:800;text-transform:uppercase;letter-spacing:2px}
h2{font-size:clamp(30px,4vw,50px);line-height:1.1;color:var(--dark);margin:8px 0 25px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.card{padding:28px;background:var(--light);border-radius:999px;box-shadow:0 12px 35px rgba(0,0,0,.06)}.card h3{color:var(--dark);font-size:24px}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:45px;align-items:center}.split img{border-radius:999px;min-height:420px;object-fit:cover}
.band{background:var(--dark);color:#fff}.band h2{color:#fff}.gallery{display:grid;grid-template-columns:2fr 1fr 1fr;gap:15px}.gallery img{height:330px;width:100%;object-fit:cover;border-radius:999px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin-top:35px}.stat{background:#fff;color:var(--dark);padding:20px;border-radius:999px;text-align:center}.stat strong{display:block;font-size:34px;color:var(--accent)}
.contact-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:30px}.contact-box,form{padding:30px;background:var(--light);border-radius:999px}
label{display:block;font-weight:700;margin:12px 0 6px}input,textarea{width:100%;padding:14px;border:1px solid #ccd;border-radius:16px;font:inherit}textarea{min-height:150px}
iframe{width:100%;height:430px;border:0;border-radius:999px}
footer{background:#111;color:#eee;padding:35px 24px;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}footer a{color:#fff}
@media(max-width:850px){.contact-mini{display:none}.menu-toggle{display:block;margin-left:auto}nav{display:none;position:absolute;top:78px;left:16px;right:16px;background:#fff;padding:14px;box-shadow:0 15px 30px rgba(0,0,0,.2);border-radius:24px;flex-direction:column}nav.open{display:flex}.split,.contact-grid{grid-template-columns:1fr}.grid3,.stats{grid-template-columns:1fr 1fr}.gallery{grid-template-columns:1fr}.gallery img{height:260px}footer{grid-template-columns:1fr;text-align:center}}
@media(max-width:520px){.grid3,.stats{grid-template-columns:1fr}.hero{min-height:68vh}section{padding:58px 18px}}