.pdf-book-viewer {
  display: flex;
  flex: 1 1 auto;
  min-height: 0;
  flex-direction: column;
  color: #ffffff;
}

.pdf-book-stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 22px 76px;
  overflow: hidden;
  background:
    radial-gradient(circle at center, rgba(255, 255, 255, 0.12), transparent 42%),
    linear-gradient(135deg, #151923 0%, #273142 48%, #111827 100%);
}

.pdf-book {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  max-width: 100%;
  max-height: 100%;
  perspective: 1600px;
  filter: drop-shadow(0 26px 34px rgba(0, 0, 0, 0.42));
}

.pdf-book-viewer.is-spread .pdf-book::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: -14px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.42);
  filter: blur(12px);
  pointer-events: none;
}

.pdf-book::before {
  content: "";
  position: absolute;
  top: 1.5%;
  bottom: 1.5%;
  left: 50%;
  z-index: 3;
  width: 22px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.28), rgba(255, 255, 255, 0.2), rgba(0, 0, 0, 0.2));
  opacity: 0.9;
  pointer-events: none;
}

.pdf-book-viewer.is-single .pdf-book::before {
  display: none;
}

.pdf-book.turning .pdf-book-sheet {
  animation: bookTurn 0.34s ease both;
}

.pdf-book-sheet {
  position: relative;
  display: flex;
  background: #ffffff;
  overflow: hidden;
  border: 1px solid rgba(20, 28, 42, 0.18);
  box-shadow: inset 0 0 28px rgba(0, 0, 0, 0.06);
}

.pdf-book-sheet:first-child {
  border-radius: 10px 0 0 10px;
  transform-origin: right center;
}

.pdf-book-sheet:last-child {
  border-radius: 0 10px 10px 0;
  transform-origin: left center;
}

.pdf-book-viewer.is-spread .pdf-book-sheet:first-child {
  box-shadow:
    inset -22px 0 28px rgba(0, 0, 0, 0.12),
    -12px 12px 28px rgba(0, 0, 0, 0.18);
}

.pdf-book-viewer.is-spread .pdf-book-sheet:last-child {
  box-shadow:
    inset 22px 0 28px rgba(0, 0, 0, 0.1),
    12px 12px 28px rgba(0, 0, 0, 0.18);
}

.pdf-book-viewer.is-spread .pdf-book-sheet:first-child::before,
.pdf-book-viewer.is-spread .pdf-book-sheet:last-child::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 2;
  width: 38px;
  pointer-events: none;
}

.pdf-book-viewer.is-spread .pdf-book-sheet:first-child::before {
  right: 0;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.18));
}

.pdf-book-viewer.is-spread .pdf-book-sheet:last-child::before {
  left: 0;
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.14), transparent);
}

.pdf-book-viewer.is-single .pdf-book-sheet {
  border-radius: 10px;
}

.pdf-book-sheet::after {
  content: attr(data-page);
  position: absolute;
  right: 14px;
  bottom: 10px;
  padding: 4px 9px;
  border-radius: 999px;
  color: #1f2937;
  background: rgba(255, 255, 255, 0.82);
  font-size: 11px;
  font-weight: 800;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.14);
}

.pdf-book-sheet canvas {
  display: block;
  max-width: none;
  background: #ffffff;
}

.pdf-book-message {
  max-width: 440px;
  padding: 24px;
  border-radius: 16px;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  text-align: center;
  font-weight: 700;
}

.pdf-book-fallback {
  width: min(100%, 1100px);
  height: 100%;
  min-height: 420px;
  border: 0;
  border-radius: 12px;
  background: #ffffff;
  box-shadow: 0 26px 34px rgba(0, 0, 0, 0.42);
}

.pdf-book-nav {
  position: absolute;
  top: 50%;
  z-index: 5;
  width: 52px;
  height: 52px;
  border: 0;
  border-radius: 50%;
  color: #ffffff;
  background: rgba(4, 18, 36, 0.68);
  box-shadow: 0 12px 26px rgba(0, 0, 0, 0.28);
  transform: translateY(-50%);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease, opacity 0.2s ease;
}

.pdf-book-nav:hover:not(:disabled) {
  background: #006bb8;
  transform: translateY(-50%) scale(1.06);
}

.pdf-book-nav:disabled,
.pdf-book-toolbar button:disabled {
  cursor: not-allowed;
  opacity: 0.38;
}

.pdf-book-nav-prev {
  left: 18px;
}

.pdf-book-nav-next {
  right: 18px;
}

.pdf-book-toolbar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 16px;
  background: linear-gradient(135deg, #081f3c 0%, #0b3d78 100%);
  box-shadow: 0 -8px 22px rgba(0, 0, 0, 0.24);
}

.pdf-book-toolbar button,
.pdf-book-toolbar a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 38px;
  padding: 9px 13px;
  border: 0;
  border-radius: 999px;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.12);
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.pdf-book-toolbar button:hover:not(:disabled),
.pdf-book-toolbar a:hover {
  background: rgba(255, 255, 255, 0.24);
  transform: translateY(-1px);
}

.pdf-book-page {
  min-width: 170px;
  color: #e7eef8;
  font-size: 13px;
  font-weight: 800;
  text-align: center;
}

@keyframes bookTurn {
  from {
    opacity: 0.48;
    transform: rotateY(-8deg) translateX(8px);
  }
  to {
    opacity: 1;
    transform: rotateY(0) translateX(0);
  }
}

@media (max-width: 760px) {
  .pdf-book-stage {
    padding: 14px 12px 76px;
  }

  .pdf-book-nav {
    top: auto;
    bottom: 14px;
    width: 44px;
    height: 44px;
    transform: none;
  }

  .pdf-book-nav:hover:not(:disabled) {
    transform: scale(1.04);
  }

  .pdf-book-nav-prev {
    left: calc(50% - 58px);
  }

  .pdf-book-nav-next {
    right: calc(50% - 58px);
  }

  .pdf-book-toolbar {
    flex-wrap: wrap;
    padding: 9px 10px;
    gap: 7px;
  }

  .pdf-book-toolbar button,
  .pdf-book-toolbar a {
    min-height: 34px;
    padding: 8px 10px;
    font-size: 12px;
  }

  .pdf-book-page {
    order: -1;
    width: 100%;
    min-width: 0;
  }
}