html,body{margin:0;padding:0;font-family:Arial,Helvetica,sans-serif;color:#333}header{background:linear-gradient(90deg,#4b6cb7,#182848);padding:1rem}header nav{display:flex;gap:1rem}header nav a{color:#fff;text-decoration:none;font-weight:bold}header nav a:hover{text-decoration:underline}main{padding:2rem;font-size:1.1rem}footer{background:#f4f4f4;padding:1rem;text-align:center;font-size:.85rem}