:root{--atmo:#064977;--atmo-dark:#053860;--atmo-light:#4A90B8;--ink:#1a2a3a;--muted:#4A5568;--line:#e5e7eb;--light:#f7f9fb;--white:#fff;--shadow:0 18px 45px rgba(6,73,119,.10)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Montserrat",Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.6}img{display:block;max-width:100%}a{text-decoration:none;color:inherit}button,input,textarea{font:inherit}.container{max-width:1400px;margin:0 auto}.site-header{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.82);backdrop-filter:blur(12px);transition:.3s;border-bottom:1px solid transparent}.site-header.scrolled{background:rgba(255,255,255,.96);border-bottom-color:rgba(6,73,119,.10);box-shadow:0 2px 14px rgba(6,73,119,.06)}.nav-wrap{height:80px;max-width:1400px;margin:auto;padding:0 40px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand img{height:48px;width:auto}.desktop-nav{display:flex;gap:2px;align-items:center}.desktop-nav a{padding:10px 16px;font-size:14px;font-weight:500;color:var(--muted);letter-spacing:.04em;transition:.2s}.desktop-nav a:hover,.desktop-nav a.active{color:var(--atmo)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:15px 30px;border:2px solid transparent;font-weight:600;letter-spacing:.04em;cursor:pointer;transition:.22s}.btn-primary{background:var(--atmo);color:#fff;border-color:var(--atmo);box-shadow:0 10px 24px rgba(6,73,119,.18)}.btn-primary:hover{background:var(--atmo-dark);border-color:var(--atmo-dark)}.btn-outline{border-color:var(--atmo);color:var(--atmo);background:transparent}.btn-outline:hover{background:var(--atmo);color:#fff}.nav-cta{padding:11px 22px;font-size:14px}.menu-toggle{display:none;background:none;border:0;padding:9px}.menu-toggle span{display:block;width:24px;height:2px;background:var(--atmo);margin:5px}.mobile-nav{display:none;padding:8px 24px 18px;border-top:1px solid rgba(6,73,119,.1);background:#fff}.mobile-nav a{display:block;padding:11px 12px;color:var(--muted);font-size:14px;font-weight:600}.mobile-nav.open{display:block}
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;overflow:hidden;background:#fff}.panel-grid{background-image:linear-gradient(to right,rgba(6,73,119,.04) 1px,transparent 1px),linear-gradient(to bottom,rgba(6,73,119,.04) 1px,transparent 1px);background-size:60px 60px}.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.25}.hero-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(255,255,255,.82),rgba(255,255,255,.72),#fff)}.hero-content{position:relative;z-index:2;text-align:center;padding:120px 24px 80px;max-width:900px}.hero-logo{height:96px;width:auto;margin:0 auto 30px}.eyebrow{text-transform:uppercase;letter-spacing:.12em;color:var(--atmo);font-size:14px;font-weight:700}.hero h1{font-size:clamp(42px,6vw,76px);line-height:1.08;letter-spacing:-.03em;margin:18px 0 0}.hero-text{font-size:clamp(17px,2vw,21px);max-width:720px;margin:28px auto 0;color:var(--muted)}.hero-actions{display:flex;gap:16px;justify-content:center;margin-top:42px;flex-wrap:wrap}.discover{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);z-index:2;text-transform:uppercase;letter-spacing:.12em;font-size:11px;color:#9aa3b1;text-align:center}.discover span{display:block;width:1px;height:36px;margin:7px auto 0;background:linear-gradient(var(--atmo),transparent)}
.section{padding:110px 40px}.white{background:#fff}.light,.contact-section{background:var(--light)}.section-head{max-width:780px}.section-head h2{font-size:clamp(34px,4vw,52px);line-height:1.12;letter-spacing:-.025em;margin:10px 0 0}.section-head p{font-size:18px;color:var(--muted);margin:17px 0 0}.service-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:60px}.service-card{border:1px solid var(--line);background:#fff;overflow:hidden;transition:.28s}.service-card:hover{border-color:var(--atmo);box-shadow:var(--shadow);transform:translateY(-3px)}.service-image{position:relative;aspect-ratio:4/3;background:#f0f4f8;overflow:hidden}.service-image img{width:100%;height:100%;object-fit:cover;transition:.5s}.service-card:hover .service-image img{transform:scale(1.045)}.service-image span{position:absolute;top:16px;left:16px;background:var(--atmo);color:#fff;padding:5px 10px;font-size:12px;font-weight:700;letter-spacing:.04em}.service-body{padding:24px}.service-body h3{margin:0 0 8px;font-size:20px}.service-body p{font-size:14px;color:var(--muted);margin:0 0 16px}.service-body ul{list-style:none;margin:0;padding:0;display:grid;gap:7px}.service-body li{font-size:12px;font-weight:600;color:var(--atmo);display:flex;align-items:center;gap:9px}.service-body li:before{content:"";width:6px;height:6px;background:var(--atmo);border-radius:50%;flex:0 0 auto}
.mechanism-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;margin-top:60px}.mechanism-photo{aspect-ratio:4/3;overflow:hidden;border:1px solid rgba(6,73,119,.1);box-shadow:var(--shadow)}.mechanism-photo img{width:100%;height:100%;object-fit:cover}.feature{display:flex;gap:22px;padding:0 0 30px;margin-bottom:30px;border-bottom:1px solid rgba(6,73,119,.1)}.feature:last-child{border-bottom:0;margin-bottom:0}.feature>span{font-size:31px;font-weight:800;color:var(--atmo-light);line-height:1}.feature h3{font-size:20px;margin:0 0 8px}.feature p{margin:0;color:var(--muted)}
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:250px;gap:16px;margin-top:60px}.gallery-item{position:relative;margin:0;overflow:hidden;border:1px solid rgba(6,73,119,.1);background:#f2f4f6}.gallery-large{grid-column:span 2;grid-row:span 2}.gallery-wide{grid-column:span 2}.gallery-item img{width:100%;height:100%;object-fit:cover;transition:.5s}.gallery-item:after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(26,42,58,.82),transparent 60%);opacity:0;transition:.3s}.gallery-item figcaption{position:absolute;left:18px;right:18px;bottom:16px;color:#fff;font-weight:600;z-index:2;opacity:0;transform:translateY(10px);transition:.3s}.gallery-item:hover img{transform:scale(1.08)}.gallery-item:hover:after,.gallery-item:hover figcaption{opacity:1}.gallery-item:hover figcaption{transform:none}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;margin-top:60px}.contact-row{display:flex;justify-content:space-between;gap:28px;align-items:center;border-bottom:1px solid rgba(6,73,119,.1);padding:0 0 16px;margin-bottom:22px}.contact-row span{text-transform:uppercase;letter-spacing:.12em;font-size:12px;color:var(--muted)}.contact-row strong{text-align:right;font-size:14px}.response-box{margin-top:34px;background:var(--atmo);color:#fff;padding:24px}.response-box span{display:block;text-transform:uppercase;letter-spacing:.12em;font-size:12px;opacity:.8;margin-bottom:4px}.response-box strong{font-size:26px}.contact-form{background:#fff;border:1px solid var(--line);padding:32px;box-shadow:var(--shadow);display:grid;gap:20px}.contact-form label{display:grid;gap:8px;color:var(--muted);font-size:14px;font-weight:600}.contact-form input,.contact-form textarea{width:100%;border:1px solid var(--line);background:#fff;color:var(--ink);padding:13px 14px;outline:none;transition:.2s}.contact-form input:focus,.contact-form textarea:focus{border-color:var(--atmo);box-shadow:0 0 0 3px rgba(6,73,119,.08)}.contact-form textarea{resize:vertical;min-height:120px}.form-submit{width:100%}.form-status{margin:0;font-size:14px;min-height:22px}.form-status.success{color:#18743b}.form-status.error{color:#b42318}.honeypot{position:absolute!important;left:-9999px!important;width:1px!important;height:1px!important;opacity:0!important}.footer{margin-top:95px;padding-top:30px;border-top:1px solid rgba(6,73,119,.1);display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:30px;color:var(--muted);font-size:13px}.footer img{height:32px;width:auto;opacity:.72}.footer p:nth-child(2){text-align:center}
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}.reveal.visible{opacity:1;transform:none}
@media(max-width:1100px){.desktop-nav,.nav-cta{display:none}.menu-toggle{display:block}.service-grid{grid-template-columns:repeat(2,1fr)}.gallery-grid{grid-template-columns:repeat(2,1fr)}.gallery-large{grid-column:span 2}.gallery-wide{grid-column:span 2}.mechanism-grid,.contact-grid{gap:40px}.footer{grid-template-columns:1fr;text-align:center}.footer img{margin:auto}.footer p:nth-child(2){text-align:center}}
@media(max-width:760px){.nav-wrap{padding:0 20px;height:72px}.brand img{height:40px}.section{padding:78px 20px}.hero-content{padding-top:110px}.hero-logo{height:76px}.hero-actions{flex-direction:column;align-items:stretch;max-width:320px;margin-left:auto;margin-right:auto}.service-grid,.mechanism-grid,.contact-grid{grid-template-columns:1fr}.service-grid{gap:18px}.gallery-grid{grid-template-columns:1fr;grid-auto-rows:250px}.gallery-large,.gallery-wide{grid-column:span 1;grid-row:span 1}.contact-row{align-items:flex-start;flex-direction:column;gap:4px}.contact-row strong{text-align:left}.contact-form{padding:24px}.footer{margin-top:70px}.discover{display:none}}

/* --- Version modulaire / performances --- */
.deferred-section{content-visibility:auto;contain-intrinsic-size:900px}
.dynamic-state{grid-column:1/-1;margin:20px 0;color:var(--muted);font-size:14px}
.dynamic-state.error{color:#b42318}
.gallery-item figcaption{display:flex;flex-direction:column;gap:4px}
.gallery-item figcaption strong{font-size:14px;line-height:1.3}
.gallery-item figcaption small{font-size:11px;font-weight:400;line-height:1.35;opacity:.88}
img{max-width:100%}
.service-image img,.gallery-item img,.mechanism-photo img,.hero-bg{background:#eef2f5}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}.reveal{opacity:1!important;transform:none!important}}