body {
  font-family: Arial, sans-serif;
  background-color: #f9f9f9;
  text-align: center;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 500px;
  margin: auto;
  padding: 10px;
}

h1, h2 {
  color: #333;
  margin-bottom: 20px;
}

button {
  display: block;
  width: 100%;
  padding: 18px;
  margin: 10px 0;
  font-size: 18px;
  background-color: #0078d7;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

button:hover {
  background-color: #005fa3;
}

button.active {
  background-color: #00b294;
}

.back-button {
  background-color: #555;
}

.hidden {
  display: none;
}

textarea#custom-message {
  font-size: 48px;
  text-align: center;
  padding: 24px;
  border-radius: 10px;
  border: 2px solid #0078d7;
  resize: none;
  width: 100%;
  box-sizing: border-box;
  margin-bottom: 20px;
  line-height: 1.4;
}

select#voiceSelect {
  font-size: 18px;
  width: 100%;
  padding: 12px;
  margin-bottom: 20px;
}

.saved-message-btn {
  font-size: 18px;
  background-color: #fffce6;
  color: #333;
  border: 2px solid #ffd633;
  border-radius: 10px;
  padding: 16px;
  width: 100%;
  box-shadow: 2px 2px 6px rgba(0,0,0,0.1);
  margin: 8px 0;
  transition: background-color 0.2s ease;
}

.saved-message-btn:hover {
  background-color: #fff8cc;
}

@media (max