body { font-family: "Helvetica Neue", sans-serif; line-height:1.6; background:#fafafa; margin:0; padding:0;}
header { background:#1e90ff; color:#fff; text-align:center; padding:20px;}
nav a { color:#fff; margin:0 10px; text-decoration:none;}
main { padding:20px; max-width:800px; margin:auto;}
footer { background:#333; color:#fff; text-align:center; padding:10px; margin-top:20px;}
article { background:#fff; padding:15px; margin-bottom:20px; border-radius:5px; box-shadow:0 2px 4px rgba(0,0,0,0.1);}