body{font-family:Arial, sans-serif; margin:0; padding:0; color:#111;}
header{padding:10px 20px; background:#f9f9f9; display:flex; justify-content:space-between; align-items:center;}
nav a{margin:0 8px; text-decoration:none; color:#111;}
main{padding:20px; max-width:900px; margin:auto;}
footer{text-align:center; padding:12px; background:#fafafa; margin-top:20px;}