body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: #f3f9fa;
  color: #111;
}

.onboarding-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 4rem 2rem;
  text-align: center;
}

.onboarding-container h1 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.onboarding-container p {
  font-size: 1rem;
  color: #444;
  margin-bottom: 2.5rem;
}

.option-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.option-button {
  padding: 1.2rem 2rem;
  font-size: 1.05rem;
  background-color: white;
  border: none;
  border-radius: 16px;
  cursor: pointer;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.05);
  transition: all 0.2s ease;
  text-align: center;
  font-weight: 500;
}

.option-button:hover {
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  background-color: #f0f9ff;
}

.option-button.selected {
  background-color: #d6f1e5;
  box-shadow: 0 0 0 2px #00c292;
  font-weight: 600;
}

#nextBtn {
  margin-top: 2.5rem;
  background-color: #111;
  color: white;
  padding: 0.9rem 2rem;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s ease;
}

#nextBtn:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

input[type="number"] {
  font-size: 1rem;
  padding: 0.8rem 1.2rem;
  border-radius: 12px;
  border: 1px solid #ccc;
  max-width: 160px;
  text-align: center;
  margin: 0 auto;
  display: block;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.05);
}

@media (max-width: 480px) {
  .onboarding-container {
    padding: 3rem 1rem;
  }

  .option-list {
    flex-direction: column;
    gap: 1rem;
  }

  .option-button {
    font-size: 1rem;
    padding: 1rem;
  }

  input[type="number"] {
    width: 100%;
    font-size: 1.1rem;
  }

  #nextBtn {
    width: 100%;
  }
}