body { font-family: Arial, sans-serif; max-width: 800px; margin: auto; padding: 1em; }
header { border-bottom: 1px solid #ccc; padding-bottom: 1em; margin-bottom: 1em; }
nav a { margin-right: 1em; }
footer { margin-top: 2em; font-size: 0.9em; color: #666; }