body { font-family: 'Inter', sans-serif; margin: 0; background: #f9fafc; color: #222; }
.container { max-width: 960px; margin: auto; padding: 1rem; }
header { background: #001f3f; color: #fff; padding: 1rem; display: flex; justify-content: space-between; }
nav ul.menu { list-style: none; display: flex; gap: 1rem; }
nav ul.menu li a { color: white; text-decoration: none; }
.btn { background: #0077cc; color: #fff; padding: 0.5rem 1rem; text-decoration: none; border-radius: 4px; }
footer { background: #001f3f; color: #fff; text-align: center; padding: 1rem; }
.whatsapp-button {
  position: fixed; bottom: 20px; right: 20px;
  background-color: #25d366; color: white;
  border-radius: 50%; width: 60px; height: 60px;
  display: flex; align-items: center; justify-content: center;
  font-size: 30px; text-decoration: none;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3); z-index: 999;
}