body {
  background: linear-gradient(135deg, #0d0d0d, #1a1a1a);
  font-family: Arial, sans-serif;
  color: #fff;
}

.chat-container {
  max-width: 500px;
  margin: 40px auto;
  background: #111;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 0 20px rgba(0,0,0,0.6);
  animation: fadeIn 0.8s ease;
}

.logo {
  text-align: center;
  font-size: 20px;
  font-weight: bold;
  color: #0d6efd;
  margin-bottom: 15px;
}

.chat-box {
  height: 350px;
  overflow-y: auto;
  margin-bottom: 15px;
}

.bot, .user {
  padding: 10px;
  border-radius: 10px;
  margin: 6px 0;
  animation: slideUp 0.3s ease;
}

.bot {
  background: #2a2a2a;
}

.user {
  background: #0d6efd;
  text-align: right;
}

button {
  margin-top: 5px;
}

.whatsapp {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #25D366;
  color: #fff;
  padding: 14px;
  border-radius: 50%;
  text-decoration: none;
  font-size: 18px;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(10px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}