/* Original cover artwork on a lightweight CSS book; no JavaScript required. */
.bru-book-stage {
  --book-depth: 26px;
  --book-half-depth: 13px;
  position: relative;
  width: min(280px, 76%);
  margin: 48px auto 36px;
  perspective: 1200px;
}
.bru-book-stage::after {
  content: "";
  position: absolute;
  left: 8%;
  bottom: -27px;
  width: 98%;
  height: 24px;
  border-radius: 50%;
  background: rgba(20, 35, 54, .22);
  filter: blur(12px);
  transform: rotate(-3deg);
  pointer-events: none;
}
.bru-book-object {
  position: relative;
  width: 100%;
  aspect-ratio: 998 / 1418;
  transform-style: preserve-3d;
  transform: rotateY(-23deg) rotateZ(-2deg);
}
.bru-book-front {
  position: absolute;
  inset: 0;
  transform: translateZ(var(--book-half-depth));
  backface-visibility: hidden;
  border-radius: 1px 3px 3px 1px;
  box-shadow: 1px 0 2px rgba(0, 0, 0, .22);
}
.bru-book-front .bru-cover {
  display: block;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: contain;
  margin: 0;
  transform: none;
  border-radius: inherit;
  box-shadow: none;
}
.bru-book-front::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, rgba(0,0,0,.26), rgba(255,255,255,.09) 1.5%, rgba(0,0,0,.16) 3%, transparent 7%, transparent 98%, rgba(255,255,255,.05));
  pointer-events: none;
}
.bru-book-back {
  position: absolute;
  inset: 0;
  background: #14202a;
  border-radius: 1px 3px 3px 1px;
  transform: translateZ(calc(-1 * var(--book-half-depth)));
  box-shadow: 9px 12px 24px rgba(20,35,54,.14);
}
.bru-book-pages {
  position: absolute;
  right: 0;
  top: 3px;
  bottom: 3px;
  width: var(--book-depth);
  transform-origin: right center;
  transform: rotateY(90deg) translateX(var(--book-half-depth));
  background: linear-gradient(90deg, rgba(103,89,65,.16), transparent 35%, rgba(255,255,255,.35) 75%, rgba(103,89,65,.14)), repeating-linear-gradient(90deg, #f4efdf 0, #f4efdf 1px, #d8d0bc 1px, #eae4d4 2px);
  border-top: 1px solid #e8dfcb;
  border-bottom: 1px solid #d5cbb6;
}
@media (max-width: 720px) {
  .bru-book-stage {
    width: min(230px, 70%);
    --book-depth: 22px;
    --book-half-depth: 11px;
    margin: 38px auto 40px;
  }
}
@media print {
  .bru-book-stage { width: 160px; margin: 25px auto; perspective: none; }
  .bru-book-object { transform: none; }
  .bru-book-front { transform: none; }
  .bru-book-back, .bru-book-pages, .bru-book-stage::after, .bru-book-front::after { display: none; }
}