/* ============ Groupe VS — charte ============ */
:root{
  --slate:#2A3B4D;      /* bleu ardoise foncé */
  --slate2:#3D5468;     /* ardoise moyen */
  --green:#2E9E7B;      /* vert */
  --green-d:#268468;    /* vert foncé (hover) */
  --bg:#F7F9FA;         /* fond clair */
  --card:#FFFFFF;
  --line:#E4E9ED;
  --text:#26313B;
  --muted:#61707E;
  --radius:16px;
  --shadow:0 6px 26px rgba(42,59,77,.07);
  --maxw:1120px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;color:var(--text);background:var(--bg);
  font-family:'Poppins','Segoe UI',system-ui,-apple-system,Arial,sans-serif;
  line-height:1.6;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;height:auto;display:block;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}
.section{padding:84px 0;}
h1,h2,h3{color:var(--slate);line-height:1.2;margin:0 0 .5em;}
h2.section-title{font-size:30px;text-align:center;margin-bottom:8px;}
.section-sub{text-align:center;color:var(--muted);max-width:640px;margin:0 auto 48px;}

/* ---- Header ---- */
.site-header{
  position:sticky;top:0;z-index:40;background:rgba(247,249,250,.9);
  backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;color:var(--slate);}
.brand img{width:38px;height:38px;}
.brand span{font-size:18px;letter-spacing:.5px;}
.brand b{color:var(--green);}
.nav-links{display:flex;align-items:center;gap:28px;}
.nav-links a{color:var(--muted);font-size:15px;font-weight:500;transition:color .2s;}
.nav-links a:hover{color:var(--slate);}
.btn{
  display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:15px;
  padding:11px 20px;border-radius:999px;transition:.2s;cursor:pointer;border:none;
}
.btn-primary{background:var(--green);color:#fff;}
.btn-primary:hover{background:var(--green-d);}
.btn-ghost{background:transparent;color:var(--slate);border:1px solid var(--line);}
.btn-ghost:hover{border-color:var(--slate);}
.nav-toggle{display:none;background:none;border:none;font-size:26px;color:var(--slate);cursor:pointer;}

/* ---- Hero ---- */
.hero{
  padding:104px 0 92px;position:relative;overflow:hidden;
  background-color:#EDF1F3;
  /* Filigrane immobilier : voile clair + photo (villa tropicale, piscine). */
  background-image:
    linear-gradient(90deg, rgba(247,249,250,.97) 0%, rgba(247,249,250,.90) 40%, rgba(247,249,250,.62) 72%, rgba(247,249,250,.42) 100%),
    url('https://images.unsplash.com/photo-1759372945658-1e9f56e751bd?q=60&w=1920&auto=format&fit=crop');
  background-size:cover, cover;
  background-position:center, center right;
  background-repeat:no-repeat, no-repeat;
}
.hero:before{
  content:"";position:absolute;inset:0;z-index:0;
  background:radial-gradient(900px 420px at 82% -10%, rgba(46,158,123,.14), transparent 60%);
}
.hero .container{position:relative;z-index:1;max-width:820px;}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;letter-spacing:2px;text-transform:uppercase;
  color:var(--green);background:rgba(46,158,123,.10);padding:6px 14px;border-radius:999px;margin-bottom:22px;}
.hero h1{font-size:46px;font-weight:700;}
.hero p.lead{font-size:19px;color:var(--muted);max-width:680px;margin:18px 0 32px;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;}

/* ---- Activités ---- */
.grid{display:grid;gap:22px;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));}
.act-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow);transition:.22s;position:relative;overflow:hidden;
}
.act-card:hover{transform:translateY(-4px);box-shadow:0 14px 36px rgba(42,59,77,.12);}
.act-card .ico{
  width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(46,158,123,.12);color:var(--green);margin-bottom:16px;
}
.act-card .ico svg{width:26px;height:26px;}
.act-card h3{font-size:19px;margin-bottom:4px;}
.act-card .form{font-size:12.5px;font-weight:600;letter-spacing:.5px;text-transform:uppercase;color:var(--slate2);opacity:.7;margin-bottom:10px;}
.act-card p{font-size:15px;color:var(--muted);margin:0;}
.act-card .tag{display:inline-block;margin-top:14px;font-size:13px;color:var(--green-d);font-weight:600;}

/* ---- Lien entre activités ---- */
.synergy{background:var(--slate);color:#E8EDF1;}
.synergy h2.section-title,.synergy h3{color:#fff;}
.synergy .section-sub{color:#AFC0CE;}
.flow{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;align-items:stretch;margin-top:10px;}
.flow .node{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:14px;
  padding:20px 22px;flex:1 1 240px;max-width:340px;
}
.flow .node h3{font-size:17px;color:#fff;margin-bottom:6px;}
.flow .node p{font-size:14.5px;color:#B7C6D3;margin:0;}
.flow .node .dot{color:var(--green);font-weight:700;}

/* ---- Espace collaborateurs CTA ---- */
.cta{background:linear-gradient(120deg,var(--green) 0%,#2b8f72 100%);color:#fff;border-radius:22px;
  padding:52px 40px;text-align:center;box-shadow:var(--shadow);}
.cta h2{color:#fff;font-size:28px;}
.cta p{color:rgba(255,255,255,.9);max-width:560px;margin:0 auto 26px;}
.cta .btn-primary{background:#fff;color:var(--green-d);}
.cta .btn-primary:hover{background:#F0F5F2;}

/* ---- Footer ---- */
.site-footer{background:#20303F;color:#9FB1BF;padding:56px 0 32px;font-size:14.5px;}
.site-footer a{color:#C6D3DD;}
.site-footer a:hover{color:#fff;}
.foot-grid{display:grid;gap:32px;grid-template-columns:1.4fr 1fr 1fr;}
.site-footer h4{color:#fff;font-size:15px;margin:0 0 14px;letter-spacing:.5px;}
.site-footer ul{list-style:none;padding:0;margin:0;}
.site-footer li{margin-bottom:8px;}
.foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px;}
.foot-brand img{width:34px;height:34px;}
.foot-brand span{font-weight:700;color:#fff;font-size:17px;}
.legal{margin-top:12px;font-size:13px;color:#7B8D9B;}
.foot-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:36px;padding-top:20px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#7B8D9B;}

/* ---- Responsive ---- */
@media(max-width:760px){
  .nav-links{position:absolute;top:72px;left:0;right:0;background:var(--bg);flex-direction:column;
    align-items:flex-start;gap:0;padding:8px 24px 20px;border-bottom:1px solid var(--line);display:none;}
  .nav-links.open{display:flex;}
  .nav-links a{padding:12px 0;width:100%;}
  .nav-toggle{display:block;}
  .hero h1{font-size:34px;}
  .hero{padding:64px 0 56px;
    background-image:
      linear-gradient(180deg, rgba(247,249,250,.94) 0%, rgba(247,249,250,.86) 60%, rgba(247,249,250,.72) 100%),
      url('https://images.unsplash.com/photo-1759372945658-1e9f56e751bd?q=60&w=1200&auto=format&fit=crop');}
  .section{padding:60px 0;}
  .foot-grid{grid-template-columns:1fr;}
}