body { font-family: 'Segoe UI', sans-serif; background-color: #f8f9fa; }
header, footer { background-color: #0d1b2a; color: white; text-align: center; padding: 20px 0; }
.whatsapp-btn { position: fixed; bottom: 20px; right: 20px; background-color: #25D366; border-radius: 50%; width: 60px; height: 60px; display: flex; align-items: center; justify-content: center; color: white; font-size: 30px; z-index: 1000; box-shadow: 0 0 10px rgba(0,0,0,0.3); transition: all 0.3s ease; }
.whatsapp-btn:hover { transform: scale(1.1); background-color: #1ebe5d; }