body{font-family:Arial,sans-serif;max-width:1000px;margin:auto;padding:20px;line-height:1.6}
nav a{margin-right:15px}
.card{border:1px solid #ddd;padding:20px;border-radius:10px;margin:10px 0}
footer{margin-top:40px;border-top:1px solid #ddd;padding-top:20px}