body{font-family:Arial,sans-serif;margin:0;background:#f4f6f9;color:#333}
header{background:#123d7a;color:#fff;padding:20px}
header h1{margin:0;color:#fff}
nav{margin-top:10px}
nav a{color:#fff;text-decoration:none;margin-right:18px;font-weight:bold}
.hero,.content{max-width:1100px;margin:auto;padding:30px}
.card{background:#fff;padding:20px;border-radius:8px;margin:15px 0;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.btn-oblicz{display:inline-block;background:#2ea44f;color:#fff;padding:15px 30px;border-radius:8px;text-decoration:none;font-weight:bold;margin:20px 0}
footer{background:#123d7a;color:#fff;text-align:center;padding:15px;margin-top:30px}