body{font-family:Arial,sans-serif;margin:0;background:#eef4f7;color:#333}header{background:#0b5d7a;color:#fff;text-align:center;padding:50px 20px}section{max-width:900px;margin:20px auto;background:#fff;padding:25px;border-radius:10px;box-shadow:0 2px 8px #0002}h1,h2{margin-top:0}.btn{display:inline-block;padding:10px 18px;background:#fff;color:#0b5d7a;text-decoration:none;border-radius:6px;margin:8px}.wa{background:#25D366;color:#fff}footer{background:#0b5d7a;color:#fff;text-align:center;padding:20px;margin-top:30px}