*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background:#f3f5f7;color:#333;line-height:1.7}
.top{display:flex;justify-content:space-between;align-items:center;padding:15px 8%;background:#16324f;color:#fff;flex-wrap:wrap}.logo img{height:70px}
nav{display:flex;justify-content:center;gap:12px;background:#fff;padding:14px;box-shadow:0 2px 6px rgba(0,0,0,.1);position:sticky;top:0}
.btn{background:#f28c28;color:#fff;text-decoration:none;padding:10px 18px;border-radius:6px;font-weight:bold}
.hero{background:url('couvreur1.jpg') center/cover no-repeat;height:430px;display:flex;justify-content:center;align-items:center}
.hero-box{background:rgba(0,0,0,.55);padding:35px;border-radius:10px;color:#fff;text-align:center}.cta{display:inline-block;margin-top:18px;background:#2e7d32;color:#fff;padding:12px 20px;text-decoration:none;border-radius:6px}
section{max-width:1150px;margin:30px auto;background:#fff;padding:35px;border-radius:10px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}.card{padding:20px;background:#fafafa;border-top:4px solid #f28c28;border-radius:8px}
.contact{display:grid;grid-template-columns:1fr 1fr;gap:20px}iframe{width:100%;height:300px;border:0;border-radius:8px}
footer{text-align:center;background:#16324f;color:#fff;padding:20px}
@media(max-width:768px){.top{flex-direction:column;text-align:center}nav{flex-wrap:wrap}.contact{grid-template-columns:1fr}}