body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  text-align: center;
  padding: 40px;
  background-color: #121212;
  color: #f0f0f0;
}

h1 {
  margin-bottom: 20px;
}

.note {
  max-width: 600px;
  margin: 0 auto 30px;
  font-size: 17.5px;
  line-height: 1.6;
  color: #ccc;
  background-color: #2a2a2a;
  padding: 14px 20px;
  border-left: 4px solid #007bff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  text-align: left;
}
.note strong em {
  color: #ffffff;
  font-weight: bold;
  font-style: italic;
  background-color: #007bff33;
  padding: 1px 4px;
  border-radius: 4px;
}
button {
  font-size: 14px;
  padding: 10px 24px;
  margin: 10px;
  border: none;
  border-radius: 20px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s, opacity 0.3s;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  min-width: 120px;
  color: white;
}

#startBtn {
  background-color: #4caf50;
}

#stopBtn {
  background-color: #e53935;
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

button:hover:not(:disabled) {
  transform: translateY(-2px);
  filter: brightness(1.1);
}

.vapi-btn {
  display: none !important;
}

#progressBar {
  width: 0%;
  height: 6px;
  background-color: #007bff;
  margin: 20px auto;
  transition: width 0.6s ease;
  border-radius: 5px;
  max-width: 300px;
}