body{font-family:Arial,sans-serif;margin:0;padding:0}
header{background:#111;color:#fff;padding:10px}
nav a{color:#fff;margin-right:15px;text-decoration:none}
main{padding:20px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:15px}
.card{border:1px solid #ddd;padding:10px;border-radius:6px}
table{width:100%;border-collapse:collapse}
th,td{border:1px solid #ccc;padding:6px;text-align:left}
footer{background:#f5f5f5;padding:15px;margin-top:30px;font-size:13px}