.tutorial-section {
  position: relative;
  overflow: hidden;
  padding-bottom: 40px;
}

.tutorial-section::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  
  /* Aqui a mágica acontece: ele lê a URL diferente de cada section */
  background-image: var(--bg-img, none); 
  background-size: cover;
  background-position: center;
  
  /* Efeito Fosco / Discreto */
  opacity: 0.10; 
  filter: grayscale(80%) blur(2px); 
  
  z-index: 0; 
  pointer-events: none; 
}