/* v5.4: continuous, softly feathered shelf-light; no polygon clipping. */
.shelf-grid .bookcase-frame .book-slot::before {
  /* Override v5.3's narrow polygon beam. The radial light fades to fully
     transparent at the boundaries, including the shelf's top. */
  left: 50%;
  top: 0;
  bottom: 0;
  height: 100%;
  width: clamp(115px, 17vw, 172px);
  max-width: none;
  transform: translateX(-50%);
  clip-path: none !important;
  -webkit-clip-path: none !important;
  background:
    radial-gradient(ellipse 50% 28% at 50% 34%, rgba(255,230,178,.37) 0%, rgba(255,213,140,.12) 46%, transparent 100%),
    radial-gradient(ellipse 62% 55% at 50% 72%, rgba(247,198,119,.14) 0%, rgba(244,186,111,.06) 56%, transparent 100%);
  filter: blur(9px);
  will-change: opacity;
  pointer-events: none;
}
/* Preserve natural aspect, but the image must fill the whole authored book
   face: contain produced visible letterboxing on books with different source ratios.
   When ratio differs, cover clips edges rather than stretching text. */
.shelf-grid .bookcase-frame .spine.has-spine-artwork .spine-artwork {
  display:block !important;
  position:absolute !important;
  inset:0 !important;
  width:100% !important;
  height:100% !important;
  max-width:none !important;
  object-fit:cover !important;
  object-position:center center !important;
  transform:none !important;
  filter:none !important;
}
@media(max-width:690px) {
 .shelf-grid .bookcase-frame .book-slot::before {
    width: clamp(90px, 24vw, 132px);
    filter: blur(7px);
 }
}
@media(prefers-reduced-motion:reduce){
 .shelf-grid .bookcase-frame .book-slot::before {transition:none!important;will-change:auto;}
}