:root{
  --navy:#062f49;
  --blue:#087ca7;
  --cyan:#11a7b7;
  --aqua:#dff7f8;
  --ink:#17313e;
  --muted:#607784;
  --paper:#ffffff;
  --sand:#f4f8f9;
  --line:#dce9ed;
  --shadow:0 18px 55px rgba(1,43,67,.13);
  --radius:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;line-height:1.65}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(1160px,calc(100% - 40px));margin:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid rgba(6,47,73,.08);backdrop-filter:blur(10px)}
.navbar{min-height:82px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:12px;color:var(--navy);font-weight:800;letter-spacing:.02em}
.brand img{width:58px;height:58px;object-fit:contain}
.brand span{max-width:190px;line-height:1.08}
.nav{display:flex;gap:22px;margin-left:auto;align-items:center}
.nav a{color:var(--ink);font-size:.95rem;font-weight:700}
.nav a.active,.nav a:hover{color:var(--blue);text-decoration:none}
.nav-cta{padding:11px 17px;border-radius:999px;background:var(--navy);color:white!important}
.menu-btn{display:none;margin-left:auto;border:0;background:none;font-size:1.7rem;color:var(--navy);cursor:pointer}
.hero{position:relative;min-height:650px;display:grid;place-items:center;color:white;overflow:hidden;background:var(--navy)}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(3,35,54,.88),rgba(3,35,54,.48),rgba(3,35,54,.26)),var(--hero) center/cover no-repeat}
.hero::after{content:"";position:absolute;left:-7%;right:-7%;bottom:-78px;height:145px;background:white;border-radius:50% 50% 0 0/40% 40% 0 0}
.hero-inner{position:relative;z-index:2;padding:80px 0 125px;max-width:820px;margin-right:auto}
.kicker{display:inline-flex;align-items:center;gap:9px;text-transform:uppercase;letter-spacing:.16em;font-size:.78rem;font-weight:800;color:#a9eef1}
.kicker::before{content:"";width:28px;height:2px;background:currentColor}
h1{font-size:clamp(2.5rem,6vw,5.2rem);line-height:.98;margin:.3em 0 .25em;letter-spacing:-.045em}
.hero p{font-size:clamp(1.03rem,2vw,1.28rem);max-width:680px;color:#eefcfd}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 19px;border-radius:999px;font-weight:800;border:1px solid transparent}
.btn-primary{background:#fff;color:var(--navy)}
.btn-secondary{border-color:rgba(255,255,255,.55);color:#fff}
.btn-dark{background:var(--navy);color:#fff}
.btn-aqua{background:var(--aqua);color:var(--navy)}
section{padding:78px 0}
.section-alt{background:var(--sand)}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.76rem;color:var(--cyan);font-weight:900}
h2{font-size:clamp(2rem,4vw,3.35rem);line-height:1.05;margin:.22em 0 .45em;color:var(--navy);letter-spacing:-.035em}
h3{color:var(--navy);font-size:1.25rem;margin-top:0}
.lead{font-size:1.12rem;color:var(--muted);max-width:780px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:42px;align-items:center}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 10px 30px rgba(6,47,73,.06)}
.card-icon{width:46px;height:46px;border-radius:14px;background:var(--aqua);display:grid;place-items:center;font-size:1.35rem;margin-bottom:18px}
.photo{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);min-height:390px;background:#dceef2}
.photo img{width:100%;height:100%;min-height:390px;object-fit:cover}
.statbar{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin-top:34px}
.stat{background:white;padding:22px;text-align:center}
.stat strong{display:block;font-size:1.55rem;color:var(--navy)}
.callout{border-radius:var(--radius);padding:34px;background:linear-gradient(135deg,var(--navy),#085f7d);color:white}
.callout h2,.callout h3{color:white}
.callout p{color:#dff8fa}
.split-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.checklist{padding-left:1.2rem}
.checklist li{margin:.5rem 0}
.badge{display:inline-block;padding:6px 10px;border-radius:999px;background:var(--aqua);color:var(--navy);font-weight:800;font-size:.8rem}
.meta{color:var(--muted);font-size:.9rem}
.page-hero{padding:72px 0 55px;background:linear-gradient(135deg,var(--navy),#08758f);color:white}
.page-hero h1{font-size:clamp(2.3rem,5vw,4.2rem);margin:.15em 0}
.page-hero p{max-width:760px;color:#dff8fa;font-size:1.08rem}
.content-block{max-width:860px}
.timeline{position:relative;margin-top:35px}
.timeline::before{content:"";position:absolute;left:12px;top:0;bottom:0;width:2px;background:var(--line)}
.timeline-item{position:relative;padding:0 0 28px 42px}
.timeline-item::before{content:"";position:absolute;left:4px;top:.4em;width:18px;height:18px;border-radius:50%;background:var(--cyan);border:4px solid white;box-shadow:0 0 0 2px var(--cyan)}
.timeline-item h3{margin-bottom:5px}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:25px}
.gallery img{width:100%;height:235px;object-fit:cover;border-radius:16px}
.info-list{display:grid;gap:14px}
.info-row{display:flex;gap:15px;padding:18px 0;border-bottom:1px solid var(--line)}
.info-row:last-child{border-bottom:0}
.info-icon{font-size:1.3rem;width:30px;flex:0 0 30px}
.notice{border-left:4px solid var(--cyan);background:#eefafb;padding:18px 20px;border-radius:0 12px 12px 0}
.footer{background:#041f30;color:#d4e7ee;padding:55px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.footer h3{color:white}
.footer a{color:#d4e7ee}
.footer-logo{display:flex;gap:15px;align-items:center}
.footer-logo img{width:70px}
.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:35px;padding-top:22px;color:#88a9b6;font-size:.88rem}
.small{font-size:.88rem}
@media(max-width:900px){
  .nav{display:none;position:absolute;left:0;right:0;top:82px;background:white;padding:20px;flex-direction:column;align-items:flex-start;border-bottom:1px solid var(--line)}
  .nav.open{display:flex}
  .menu-btn{display:block}
  .grid-2,.grid-3,.split-cards,.footer-grid{grid-template-columns:1fr}
  .statbar{grid-template-columns:1fr 1fr}
  .gallery{grid-template-columns:1fr 1fr}
  .hero{min-height:600px}
}
@media(max-width:560px){
  .container{width:min(100% - 28px,1160px)}
  section{padding:58px 0}
  .brand span{display:none}
  .gallery,.statbar{grid-template-columns:1fr}
  .hero-inner{padding-top:55px}
}
/* Galerie fosse de plongée */
.fosse-gallery {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.fosse-gallery img {
    display: block;
    width: 100%;
    object-fit: cover;
    border-radius: 18px;
}

.fosse-gallery .fosse-main {
    height: 260px;
}

.fosse-gallery-bottom {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.fosse-gallery-bottom img {
    height: 160px;
}

@media (max-width: 700px) {
    .fosse-gallery .fosse-main {
        height: 220px;
    }

    .fosse-gallery-bottom {
        grid-template-columns: 1fr;
    }

    .fosse-gallery-bottom img {
        height: 220px;
    }
}