/* =========================
   Variables & bases
   ========================= */
:root{
  --blue:#26a6d4;
  --blue-strong:#1e9ac7;
  --text:#111;
  --border:#e6e9ee;
  --container:1100px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0}
body{
  font:400 16px/1.6 Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  color:var(--text); background:#fff;
}
.wrap{max-width:var(--container); margin-inline:auto; padding:0 20px}

/* =========================
   Topbar
   ========================= */
.topbar img{display:block; width:100%; max-width:1000px; height:auto; margin:0 auto}

/* =========================
   Navigation
   ========================= */
.mainnav{border-block:2px solid var(--blue); margin-top:10px}
.menu{
  display:flex; flex-wrap:wrap; justify-content:center; align-items:center;
  gap:24px; list-style:none; padding:14px 0; margin:0;
}
.menu a{
  display:inline-block; padding:10px 14px;
  color:var(--text); text-decoration:none; letter-spacing:.3px; font-weight:600; border-radius:6px;
}
.menu a.active{background:var(--blue); color:#fff; box-shadow:0 2px 0 var(--blue-strong) inset}
.nav-toggle{display:none; background:none; border:0; font-size:1.6rem; line-height:1; cursor:pointer}

.subline{border-block:1px solid var(--blue); background:#fff}
.under-title{margin:10px 0; text-align:center; font-weight:600}
.under-title a{text-decoration:none; color:inherit}
.under-title a:hover{color:var(--blue)}

/* =========================
   Contenu
   ========================= */
.content{padding:40px 0 20px}

.ins-title{
  margin:0 0 28px;
  font-size:clamp(28px, 5vw, 48px);
  letter-spacing:.5px;
  color:var(--blue);
  font-weight:700;
  text-transform:uppercase;
}

/* Encadré simple */
.ins-box{
  border:1px solid var(--border);
  border-radius:6px;
  padding:24px 26px;
  background:#fff;
  box-shadow:0 1px 3px rgba(0,0,0,.04);
  max-width:900px;
}
.ins-box p{margin:0 0 12px}

/* Bouton principal */
.btn-primary{
  display:inline-block; padding:10px 16px; border-radius:6px;
  background:var(--blue); color:#fff; text-decoration:none; font-weight:700;
  box-shadow:0 1px 0 rgba(0,0,0,.05) inset; border:1px solid rgba(0,0,0,.06);
}
.btn-primary:hover{background:var(--blue-strong)}

/* =========================
   Footer
   ========================= */
.footer{
  margin-top:80px; padding:48px 0 64px; text-align:center;
  background:#2f2e2b; color:#cfd2d6;
}

/* =========================
   Breakpoints
   ========================= */
@media (max-width:1100px){
  :root{--container:92vw}
}
@media (max-width:700px){
  .mainnav,.mainnav .wrap{position:relative}
  .nav-toggle{
    display:block; position:absolute; right:20px; top:8px; z-index:3;
    padding:8px 10px; background:none; border:0;
  }
  .menu{
    display:none; flex-direction:column; align-items:stretch;
    gap:16px; padding:8px; margin-top:44px; border-top:1px solid #e5e7eb;
    position:relative; z-index:2; background:#fff;
  }
  .menu.open{display:flex}
  .topbar img{max-width:92vw}
}