/* Mobile: flatten subject wrappers into a compact three-column book grid. */
@media (max-width:700px) {
 #sec-book-summaries {
  display:grid !important;
  grid-template-columns:repeat(3,minmax(0,1fr)) !important;
  width:100% !important;
  max-width:100% !important;
  column-gap:12px;
  row-gap:14px;
  align-items:start;
 }
 #sec-book-summaries > .cat-header { grid-column:1 / -1; }
 #sec-book-summaries > .cat,
 #sec-book-summaries .learning-books { display:contents !important; }
 #sec-book-summaries .book-card {
  width:100% !important;
  min-width:0;
  max-width:100%;
  height:156px;
  margin:0;
  box-sizing:border-box;
 }
 #sec-book-summaries .book-card > img {
  display:block;
  width:100%;
  max-width:100%;
  height:100%;
  object-fit:contain;
 }
}