body { font-family: Arial, sans-serif; background: #fff; color: #333; margin: 0; padding: 0; }
header { background: #000; color: #fff; padding: 10px; display: flex; justify-content: space-between; align-items: center; }
.logo { height: 40px; }
nav a { color: #fff; margin: 0 10px; text-decoration: none; }
.whatsapp { background: #25D366; color: #fff; padding: 8px 12px; border-radius: 4px; text-decoration: none; }
main { padding: 20px; text-align: center; }