body{font-family:Arial;margin:0;background:#f3f3f3}
header{background:#4f67a3;color:white;padding:20px}
.nav button{margin-right:10px;padding:10px}
main{padding:20px;max-width:900px;margin:auto}
.card{background:white;padding:20px;margin-bottom:20px;border-radius:10px}
input,select{width:100%;padding:10px;margin-top:10px}
table{width:100%;margin-top:15px;border-collapse:collapse}
td,th{border:1px solid #ccc;padding:8px;text-align:left}