/* ==========================================================================
   3D BOOK ANIMATIONS, VIRTUAL BOOKSHELF & FLIP ENGINE STYLES
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 3D BOOK HOVER & TILT CARDS
   -------------------------------------------------------------------------- */
.book-3d-wrap {
  position: relative;
  width: 170px;
  height: 250px;
  perspective: 1200px;
  margin: 0 auto;
}

.book-3d {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateY(-18deg) rotateX(10deg);
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.5s ease;
  cursor: pointer;
}

.book-3d-wrap:hover .book-3d {
  transform: rotateY(-5deg) rotateX(2deg) translateZ(30px) scale(1.05);
}

.book-3d-front {
  position: absolute;
  inset: 0;
  border-radius: 3px 8px 8px 3px;
  background-size: cover;
  background-position: center;
  box-shadow: 
    inset 4px 0 10px rgba(0, 0, 0, 0.5),
    inset -2px 0 5px rgba(255, 255, 255, 0.2),
    8px 10px 25px rgba(0, 0, 0, 0.6);
  transform: translateZ(12px);
  overflow: hidden;
}

.book-3d-front::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 18px;
  height: 100%;
  background: linear-gradient(90deg, 
    rgba(255, 255, 255, 0.2) 0%, 
    rgba(0, 0, 0, 0.4) 40%, 
    rgba(255, 255, 255, 0.1) 70%, 
    transparent 100%);
  pointer-events: none;
}

.book-3d-spine {
  position: absolute;
  top: 0;
  left: 0;
  width: 24px;
  height: 100%;
  background: #231915;
  transform: rotateY(-90deg) translateZ(0px);
  transform-origin: left;
  border-radius: 3px 0 0 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.8);
}

.spine-title {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  font-family: var(--font-display);
  font-size: 0.65rem;
  color: var(--gold-foil);
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.book-3d-pages {
  position: absolute;
  top: 3px;
  right: 0;
  width: 20px;
  height: calc(100% - 6px);
  background: repeating-linear-gradient(
    90deg,
    #F4EBD9 0px,
    #E6D7BD 1px,
    #F4EBD9 2px
  );
  transform: rotateY(90deg) translateZ(158px);
  transform-origin: right;
  border-radius: 0 3px 3px 0;
  box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.3);
}

.book-3d-back {
  position: absolute;
  inset: 0;
  background: #1b1512;
  border-radius: 8px 3px 3px 8px;
  transform: translateZ(-12px) rotateY(180deg);
  box-shadow: -5px 10px 25px rgba(0, 0, 0, 0.7);
}

/* --------------------------------------------------------------------------
   2. 3D VIRTUAL BOOKSHELF VIEW
   -------------------------------------------------------------------------- */
.bookshelf-stage {
  perspective: 1600px;
  perspective-origin: 50% 40%;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

.bookshelf-row {
  position: relative;
  height: 280px;
  background: transparent;
  display: flex;
  align-items: flex-end;
  padding: 0 3rem 0 3rem;
  gap: 12px;
}

.bookshelf-wood {
  position: absolute;
  bottom: -20px;
  left: 0;
  right: 0;
  height: 24px;
  background: linear-gradient(180deg, #3d2617 0%, #20130b 100%);
  border-top: 2px solid #5a3821;
  border-bottom: 3px solid #140b06;
  box-shadow: 
    0 15px 30px rgba(0, 0, 0, 0.8),
    inset 0 2px 4px rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  transform: translateZ(-20px);
}

.bookshelf-wood::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 10px;
  background: linear-gradient(90deg, rgba(0,0,0,0.6), transparent 15%, transparent 85%, rgba(0,0,0,0.6));
}

.shelf-book {
  position: relative;
  height: var(--book-h, 230px);
  width: var(--book-w, 42px);
  transform-style: preserve-3d;
  cursor: pointer;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), z-index 0.1s;
  transform-origin: bottom center;
}

.shelf-book:hover {
  transform: translateY(-25px) translateZ(40px) rotateY(-12deg);
  z-index: 50;
}

.shelf-spine {
  position: absolute;
  inset: 0;
  border-radius: 4px 4px 0 0;
  background: var(--spine-color, #4A2E1B);
  box-shadow: 
    inset 3px 0 8px rgba(255, 255, 255, 0.15),
    inset -3px 0 8px rgba(0, 0, 0, 0.6),
    3px 5px 15px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0.3rem;
  border-left: 1px solid rgba(255, 255, 255, 0.1);
  border-right: 1px solid rgba(0, 0, 0, 0.4);
}

.shelf-spine::before,
.shelf-spine::after {
  content: '';
  width: 70%;
  height: 2px;
  background: var(--gold-foil);
  box-shadow: 0 0 4px rgba(212, 175, 55, 0.5);
}

.shelf-spine-title {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  transform: rotate(180deg);
  font-family: var(--font-display);
  font-size: 0.725rem;
  letter-spacing: 0.12em;
  color: #FFF;
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(0,0,0,0.8);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-height: 140px;
}

.shelf-spine-author {
  font-family: var(--font-serif);
  font-size: 0.65rem;
  color: var(--brass-light);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.shelf-book-tooltip {
  position: absolute;
  bottom: calc(100% + 15px);
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: rgba(18, 15, 14, 0.95);
  border: 1px solid var(--gold-foil);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  width: 200px;
  text-align: center;
  box-shadow: var(--shadow-lg), 0 0 15px rgba(212, 175, 55, 0.2);
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  z-index: 100;
}

.shelf-book:hover .shelf-book-tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* --------------------------------------------------------------------------
   3. 3D PAGE-FLIP READER MODAL ("LOOK INSIDE")
   -------------------------------------------------------------------------- */
.reader-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(8, 6, 5, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.reader-modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.reader-modal-container {
  width: 90vw;
  max-width: 1050px;
  height: 620px;
  position: relative;
  display: flex;
  flex-direction: column;
  background: #191412;
  border: 1px solid var(--border-gold);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), 0 0 50px rgba(0, 0, 0, 0.8);
  overflow: hidden;
  transform: scale(0.95) translateY(20px);
  transition: transform var(--transition-normal);
}

.reader-modal-backdrop.active .reader-modal-container {
  transform: scale(1) translateY(0);
}

.reader-header {
  padding: 1rem 1.5rem;
  background: #14100e;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.reader-title-info h3 {
  font-size: 1.1rem;
  color: var(--gold-foil);
}

.reader-title-info span {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.reader-close-btn {
  background: none;
  border: none;
  color: var(--parchment-dim);
  font-size: 1.35rem;
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.reader-close-btn:hover {
  color: #FFF;
  background: rgba(255, 255, 255, 0.1);
}

.reader-stage {
  flex-grow: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 2000px;
  background: radial-gradient(circle at center, #241c17 0%, #120f0e 80%);
  padding: 2rem;
  position: relative;
}

/* 3D Book Binder in Reader */
.flipbook {
  position: relative;
  width: 780px;
  height: 460px;
  display: flex;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
  border-radius: 4px;
}

.flipbook-page {
  width: 50%;
  height: 100%;
  background: var(--parchment);
  color: var(--text-dark);
  padding: 2.5rem 2.25rem;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.08);
}

.flipbook-page.page-left {
  border-radius: 4px 0 0 4px;
  border-right: 1px solid #d8caa9;
  background: linear-gradient(90deg, #eae0cf 0%, var(--parchment) 10%, var(--parchment) 90%, #dfcfb2 100%);
}

.flipbook-page.page-right {
  border-radius: 0 4px 4px 0;
  border-left: 1px solid #d8caa9;
  background: linear-gradient(90deg, #dfcfb2 0%, var(--parchment) 10%, var(--parchment) 90%, #eae0cf 100%);
}

.page-gutter-shadow {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 40px;
  pointer-events: none;
}

.page-left .page-gutter-shadow {
  right: 0;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.18));
}

.page-right .page-gutter-shadow {
  left: 0;
  background: linear-gradient(-90deg, transparent, rgba(0, 0, 0, 0.18));
}

.page-header-text {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #7d6e5a;
  text-align: center;
  border-bottom: 1px solid rgba(125, 110, 90, 0.2);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.page-body-text {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.65;
  color: #2b2118;
}

.page-body-text p {
  margin-bottom: 1rem;
  text-indent: 1.5rem;
}

.page-body-text p:first-of-type {
  text-indent: 0;
}

.page-body-text .dropcap {
  float: left;
  font-family: var(--font-display);
  font-size: 3.2rem;
  line-height: 0.8;
  padding-right: 0.5rem;
  padding-top: 0.25rem;
  color: var(--leather-burgundy);
  font-weight: 700;
}

.page-num {
  position: absolute;
  bottom: 1.25rem;
  font-family: var(--font-serif);
  font-size: 0.85rem;
  color: #8c7b66;
}

.page-left .page-num { left: 2.25rem; }
.page-right .page-num { right: 2.25rem; }

.reader-controls {
  padding: 0.75rem 2rem;
  background: #14100e;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.reader-nav-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--parchment);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.reader-nav-btn:hover:not(:disabled) {
  border-color: var(--gold-foil);
  color: var(--gold-foil);
  background: rgba(212, 175, 55, 0.1);
}

.reader-nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* --------------------------------------------------------------------------
   4. 3D DIGITAL LIBRARY MEMBERSHIP CARD
   -------------------------------------------------------------------------- */
.library-card-3d-wrap {
  width: 380px;
  height: 230px;
  perspective: 1000px;
  margin: 0 auto;
}

.library-card-3d {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
}

.library-card-3d.flipped {
  transform: rotateY(180deg);
}

.library-card-front,
.library-card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-lg), 0 0 20px rgba(0, 0, 0, 0.6);
  border: 1px solid var(--gold-foil);
}

.library-card-front {
  background: linear-gradient(135deg, #1c1410 0%, #2f1c21 50%, #171d18 100%);
}

.library-card-front::after {
  content: '';
  position: absolute;
  inset: 5px;
  border: 1px dashed rgba(212, 175, 55, 0.35);
  border-radius: 6px;
  pointer-events: none;
}

.library-card-back {
  background: linear-gradient(135deg, #140f0c 0%, #201517 100%);
  transform: rotateY(180deg);
}

.card-chip {
  width: 40px;
  height: 30px;
  background: linear-gradient(135deg, #e5c378 0%, #997a15 100%);
  border-radius: 4px;
  border: 1px solid #ffe89c;
}

.card-barcode {
  height: 40px;
  background: repeating-linear-gradient(
    90deg,
    #EDE6D8 0px,
    #EDE6D8 2px,
    transparent 2px,
    transparent 4px,
    #EDE6D8 4px,
    #EDE6D8 7px,
    transparent 7px,
    transparent 9px
  );
  border-radius: 2px;
}

@media (max-width: 860px) {
  .flipbook {
    width: 95%;
    height: 420px;
  }
  .flipbook-page {
    padding: 1.5rem;
  }
  .page-body-text {
    font-size: 0.9rem;
  }
  .library-card-3d-wrap {
    width: 100%;
    max-width: 340px;
  }
}