body {font-family: Arial, sans-serif; background: #f9f9f9; color: #333; margin:0; padding:0;}
header {background:#1e3a8a; color:white; padding:15px; text-align:center;}
nav a {color:white; margin:0 10px; text-decoration:none; font-weight:bold;}
main {max-width:800px; margin:30px auto; background:white; padding:20px; border-radius:10px; box-shadow:0 0 10px rgba(0,0,0,.1);}
footer {text-align:center; color:#777; padding:20px;}