:root{--muted:#4b5563}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#fff;color:#000}
.header{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;position:fixed;top:0;left:0;right:0;background:rgba(255,255,255,0.95);backdrop-filter:blur(2px);z-index:50;border-bottom:1px solid #eee}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:48px}
.nav a{margin-left:12px;text-decoration:none;color:#000;font-weight:600}
.container{max-width:1100px;margin:120px auto 40px;padding:0 18px}
.hero{height:320px;display:flex;align-items:center;justify-content:center;padding-top:0;background-image:url('background.jpg');background-size:cover;background-position:center;position:relative}
.overlay{background:rgba(255,255,255,0.86);padding:22px;border-radius:10px;max-width:820px;text-align:left}
.card{background:#fff;padding:16px;border-radius:10px;box-shadow:0 6px 18px rgba(0,0,0,0.06);border:1px solid rgba(0,0,0,0.04);margin-bottom:16px}
.footer{padding:18px;text-align:center;color:var(--muted);font-size:14px;background:#fff;margin-top:20px;border-top:1px solid #eee}
select,button,input,textarea{padding:10px;border-radius:8px;border:1px solid #ddd;font-size:15px}
.btn{display:inline-block;padding:10px 14px;border-radius:8px;text-decoration:none;background:#000;color:#fff;font-weight:600;border:none;cursor:pointer}
.small-muted{color:var(--muted);font-size:14px}
.paiement em{font-size:0.9em;color:#555;font-style:italic}
@media(max-width:760px){
  .nav{display:none}
  .brand img{height:42px}
  .container{margin-top:100px}
  .hero{height:200px}
}