.slider {
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 600px;
  overflow: hidden;
  position: relative;
  border-radius: 10px; /* optional, passt aber zu deinem Look */
  margin-bottom: 1rem;
}

/* Bilder */
.slider img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 1.7s ease-in-out;
}

.slider img.active {
  opacity: 1;
}

/* Mobile */
@media (max-width: 768px) {
  .slider {
    aspect-ratio: 4 / 3;
  }
}

@media (max-width: 480px) {
  .slider {
    aspect-ratio: 1 / 1;
  }
}