body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f8ff;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.app-container {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
  padding: 30px;
  width: 350px;
  text-align: center;
}

.btn-grid {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background-color: #007bff;
  color: white;
  font-weight: bold;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #0056b3;
}

.next-btn {
  margin-top: 20px;
  display: none;
}

.scoreboard {
  margin-top: 15px;
  font-size: 14px;
}