.pdf-responsive-wrapper {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  padding-top: 56.25%; /* 16:9 Aspect Ratio */
}
.pdf-iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  min-height: 400px;
}
@media (max-width: 600px) {
  .pdf-responsive-wrapper {
    padding-top: 130%; /* Taller aspect for mobile */
  }
  .pdf-iframe {
    min-height: 300px;
  }
}