body { font-family: Arial, sans-serif; margin: 0; padding: 20px; background: #f9f9f9; color: #333; }
header { background: #fff; padding: 15px; border-bottom: 1px solid #ddd; display: flex; justify-content: space-between; align-items: center; }
nav a { margin-left: 15px; text-decoration: none; color: #0073aa; font-weight: bold; }
main { margin-top: 20px; }