body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f5f5f5;
  margin: 0;
  padding: 20px;
}

h2 {
  margin-bottom: 20px;
}

.controls {
  margin-bottom: 20px;
}

#topicInput {
  padding: 6px;
  font-size: 16px;
  width: 200px;
}

#connectBtn {
  padding: 6px 12px;
  font-size: 16px;
  margin-left: 10px;
  cursor: pointer;
}

#statusBox {
  width: 350px;
  margin: 0 auto;
  padding: 40px;
  border-radius: 12px;
  font-size: 22px;
  font-weight: bold;
  transition: all 0.3s ease;
}

.status-normal {
  background-color: #d4edda;
  color: #155724;
  border: 2px solid #c3e6cb;
}

.status-alert {
  background-color: #f8d7da;
  color: #721c24;
  border: 2px solid #f5c6cb;
  animation: blink 1s infinite;
}

@keyframes blink {
  50% { opacity: 0.5; }
}