*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-blue:   #3A00CC;
  --c-violet: #7A02B3;
  --c-pink:   #D90093;
  --c-red:    #D90000;
  --c-orange: #FF6600;
  --c-yellow: #FFDD00;

  --font-display: 'Cinzel', serif;
  --font-body:    'Lato', sans-serif;

  --header-h: 92px;
  --transition: 0.35s cubic-bezier(.25,.8,.25,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: #fff;
  background: linear-gradient(
    to bottom,
    var(--c-yellow)  0%,
    var(--c-orange) 20%,
    var(--c-red)    40%,
    var(--c-pink)   60%,
    var(--c-violet) 80%,
    var(--c-blue)  100%
  );
  background-attachment: fixed;
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 110px 0 170px;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,0.15);
}

.logo-placeholder {
  position: absolute;
  left: 24px;
  width: 132px;
  height: 68px;
  border-radius: 12px;
  border: 2px dashed rgba(255,255,255,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-family: var(--font-body);
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.logo-img {
  position: absolute;
  left: 24px;
  height: 68px;
  max-width: 220px;
  width: auto;
  object-fit: contain;
}

.qr-link {
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: block;
  border-radius: 10px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.qr-link:hover,
.qr-link:focus-visible {
  transform: translateY(-50%) scale(1.06);
  box-shadow: 0 6px 20px rgba(0,0,0,0.4);
  outline: none;
}

.qr-placeholder {
  width: 68px;
  height: 68px;
  border-radius: 10px;
  border: 2px dashed rgba(255,255,255,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  font-family: var(--font-body);
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: center;
  line-height: 1.3;
  padding: 4px;
}

.qr-img {
  width: 68px;
  height: 68px;
  object-fit: contain;
  border-radius: 10px;
  background: #fff;
}

.site-title {
  font-family: var(--font-display);
  font-size: clamp(0.85rem, 2vw, 1.45rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: center;
  color: #fff;
  text-shadow: 0 2px 18px rgba(0,0,0,0.5);
}

.section-selection,
.section-collection {
  padding: 60px 48px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: 48px;
  color: #fff;
  text-shadow: 0 2px 24px rgba(0,0,0,0.6);
}
.section-title::after {
  content: '';
  display: block;
  width: 64px;
  height: 3px;
  background: rgba(255,255,255,0.7);
  margin: 12px auto 0;
  border-radius: 2px;
}

.books-3d-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px 40px;
  max-width: 900px;
  margin: 0 auto;
}

.book-3d-card:nth-child(4) { grid-column: 1 / 2; margin-left: 50%; }
.book-3d-card:nth-child(5) { grid-column: 2 / 3; }

.book-3d-card {
  perspective: 900px;
  cursor: pointer;
  display: flex;
  justify-content: center;
}

.book-3d-inner {
  width: 180px;
  height: 250px;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateY(-25deg) rotateX(5deg);
  transition: transform var(--transition), box-shadow var(--transition);
  will-change: transform;
}

.book-3d-card:hover .book-3d-inner {
  transform: rotateY(-20deg) rotateX(4deg) scale(1.12) translateY(-10px);
  filter: drop-shadow(0 24px 40px rgba(0,0,0,0.55));
}

.b-cover, .b-spine, .b-pages-top, .b-pages-right, .b-pages-bottom {
  position: absolute;
  backface-visibility: hidden;
}

.b-back {
  position: absolute;
  backface-visibility: visible;
}

.b-cover {
  width: 180px;
  height: 250px;
  border-radius: 0 6px 6px 0;
  overflow: hidden;
  transform: translateZ(18px);
  background: #222;
}
.b-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.b-back {
  width: 180px;
  height: 250px;
  border-radius: 6px 0 0 6px;
  transform: translateZ(-18px) rotateY(180deg);
  background: #1a1a2e;
  overflow: hidden;
}
.b-back img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.b-spine {
  width: 36px;
  height: 250px;
  left: -18px;
  top: 0;
  transform: rotateY(-90deg) translateZ(0px);
  border-radius: 4px 0 0 4px;
}

.b-pages-top {
  width: 180px;
  height: 36px;
  top: -18px;
  left: 0;
  transform: rotateX(90deg) translateZ(0);
  background: repeating-linear-gradient(
    0deg,
    #f0ebe0 0px, #f0ebe0 1px,
    #e2d9c8 1px, #e2d9c8 3px
  );
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.18);
  opacity: 1;
}

.b-pages-right {
  width: 36px;
  height: 250px;
  right: -18px;
  top: 0;
  transform: rotateY(90deg) translateZ(0);
  background: repeating-linear-gradient(
    90deg,
    #f0ebe0 0px, #f0ebe0 1px,
    #e2d9c8 1px, #e2d9c8 3px
  );
  box-shadow: inset 2px 0 8px rgba(0,0,0,0.18);
  opacity: 1;
}

.b-pages-bottom {
  width: 180px;
  height: 36px;
  bottom: -18px;
  left: 0;
  transform: rotateX(-90deg) translateZ(0);
  background: repeating-linear-gradient(
    0deg,
    #f0ebe0 0px, #f0ebe0 1px,
    #e2d9c8 1px, #e2d9c8 3px
  );
  box-shadow: inset 0 -2px 8px rgba(0,0,0,0.18);
  opacity: 1;
}

.book-3d-label {
  text-align: center;
  margin-top: 16px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.85);
  text-shadow: 0 1px 8px rgba(0,0,0,0.5);
  max-width: 180px;
}

.book-open-animation {
  animation: bookOpen 0.8s cubic-bezier(.4,0,.2,1) forwards;
}
@keyframes bookOpen {
  0%   { transform: rotateY(-5deg) scale(1.12); opacity: 1; }
  40%  { transform: rotateY(15deg) scale(1.18); opacity: 1; }
  80%  { transform: rotateY(90deg) scale(1.1);  opacity: 0.3; }
  100% { transform: rotateY(90deg) scale(0.8);  opacity: 0; }
}

.collection-search-wrap {
  max-width: 640px;
  margin: 0 auto 32px;
}

.collection-search {
  width: 100%;
  padding: 14px 20px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.25);
  background: rgba(0,0,0,0.3);
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.95rem;
  outline: none;
  transition: background var(--transition), border-color var(--transition);
}
.collection-search::placeholder { color: rgba(255,255,255,0.55); }
.collection-search:focus {
  background: rgba(0,0,0,0.45);
  border-color: rgba(255,255,255,0.5);
}

.collection-categories {
  max-width: 760px;
  margin: 0 auto;
}

.category-block {
  margin-bottom: 44px;
}
.category-block:last-child { margin-bottom: 0; }

.category-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-yellow);
  margin-bottom: 14px;
  padding-left: 4px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.4);
}

.category-list {
  margin: 0;
}

.books-list {
  display: flex;
  flex-direction: column;
  max-width: 760px;
  margin: 0 auto;
  border-radius: 16px;
  overflow: hidden;
  background: rgba(0,0,0,0.22);
  border: 1px solid rgba(255,255,255,0.12);
}

.book-list-row {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 20px;
  cursor: pointer;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  transition: background var(--transition), padding-left var(--transition);
}
.books-list .book-list-row:last-child { border-bottom: none; }

.book-list-row:hover,
.book-list-row:focus-visible {
  background: rgba(255,255,255,0.1);
  padding-left: 26px;
  outline: none;
}

.book-list-cover {
  width: 46px;
  height: 64px;
  min-width: 46px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  background: #1a0040;
}

.book-list-placeholder {
  width: 46px;
  height: 64px;
  min-width: 46px;
  border-radius: 4px;
  background: #1a0040;
}

.book-list-content {
  flex: 1;
  min-width: 0;
}

.book-list-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-list-author {
  font-size: 0.8rem;
  color: var(--c-yellow);
  margin-top: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-list-arrow {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.45);
  flex: 0 0 auto;
  transition: transform var(--transition);
}
.book-list-row:hover .book-list-arrow { transform: translateX(4px); }

.collection-empty {
  text-align: center;
  padding: 32px 16px;
  color: rgba(255,255,255,0.65);
  font-style: italic;
  display: none;
}
.collection-empty.visible { display: block; }

.overlay-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  z-index: 200;
  backdrop-filter: blur(4px);
}
.overlay-backdrop.active { display: block; }

.book-reader-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 300;
  align-items: center;
  justify-content: center;
}
.book-reader-overlay.active {
  display: flex;
  animation: fadeIn 0.35s ease;
}

.reader-inner {
  display: flex;
  gap: 48px;
  align-items: center;
  background:
    linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.45)),
    linear-gradient(
      to right,
      var(--c-blue)   0%,
      var(--c-violet) 20%,
      var(--c-pink)   40%,
      var(--c-red)    60%,
      var(--c-orange) 80%,
      var(--c-yellow) 100%
    );
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px;
  padding: 48px;
  max-width: 860px;
  width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 32px 80px rgba(0,0,0,0.7);
}

.reader-close, .sheet-close {
  position: fixed;
  top: 24px;
  right: 32px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  color: #fff;
  font-size: 1.3rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 310;
  display: none;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.reader-close:hover, .sheet-close:hover {
  background: rgba(255,255,255,0.25);
}
.reader-close.visible, .sheet-close.visible {
  display: flex;
}

.reader-3d-side {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.book-3d-viewer {
  width: 200px;
  height: 280px;
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(10deg) rotateY(-20deg);
  cursor: grab;
  user-select: none;
}
.book-3d-viewer.grabbing { cursor: grabbing; }

.book-3d-spine,
.book-3d-cover,
.book-3d-pages,
.book-3d-pages-top,
.book-3d-pages-right {
  position: absolute;
  backface-visibility: hidden;
}

.book-3d-back {
  position: absolute;
  backface-visibility: visible;
}

.book-3d-cover {
  width: 200px;
  height: 280px;
  transform: translateZ(20px);
  border-radius: 0 6px 6px 0;
  overflow: hidden;
  background: #222;
}
.book-3d-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-3d-back {
  width: 200px;
  height: 280px;
  transform: translateZ(-20px) rotateY(180deg);
  border-radius: 6px 0 0 6px;
  background: #1a1a2e;
  overflow: hidden;
}

.book-3d-spine {
  width: 40px;
  height: 280px;
  left: -20px;
  transform: rotateY(-90deg) translateZ(0);
  border-radius: 4px 0 0 4px;
}

/* Tranche bas du viewer */
.book-3d-pages {
  width: 200px;
  height: 40px;
  bottom: -20px;
  transform: rotateX(-90deg) translateZ(0);
  background: repeating-linear-gradient(
    0deg, #f0ebe0 0px, #f0ebe0 1px, #e2d9c8 1px, #e2d9c8 3px
  );
  box-shadow: inset 0 -2px 8px rgba(0,0,0,0.18);
  opacity: 1;
}

/* Tranche haut du viewer */
.book-3d-pages-top {
  width: 200px;
  height: 40px;
  top: -20px;
  left: 0;
  transform: rotateX(90deg) translateZ(0);
  background: repeating-linear-gradient(
    0deg, #f0ebe0 0px, #f0ebe0 1px, #e2d9c8 1px, #e2d9c8 3px
  );
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.18);
  opacity: 1;
}

/* Tranche droite du viewer */
.book-3d-pages-right {
  width: 40px;
  height: 280px;
  right: -20px;
  top: 0;
  transform: rotateY(90deg) translateZ(0);
  background: repeating-linear-gradient(
    90deg, #f0ebe0 0px, #f0ebe0 1px, #e2d9c8 1px, #e2d9c8 3px
  );
  box-shadow: inset 2px 0 8px rgba(0,0,0,0.18);
  opacity: 1;
}

.viewer-hint {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.45);
  text-align: center;
  font-style: italic;
  max-width: 200px;
}

.reader-info-side {
  flex: 1;
  min-width: 0;
}

.reader-title {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2.5vw, 1.75rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.reader-author {
  font-size: 1rem;
  color: var(--c-yellow);
  font-weight: 300;
  letter-spacing: 0.04em;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.reader-divider, .sheet-divider {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.25);
  margin: 20px 0;
}

.reader-summary {
  font-size: 0.95rem;
  line-height: 1.75;
  color: rgba(255,255,255,0.95);
  text-shadow: 0 1px 8px rgba(0,0,0,0.45);
}

.book-sheet-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 300;
  align-items: center;
  justify-content: center;
}
.book-sheet-overlay.active {
  display: flex;
  animation: fadeIn 0.35s ease;
}

.sheet-inner {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  background:
    linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.45)),
    linear-gradient(
      to right,
      var(--c-blue)   0%,
      var(--c-violet) 20%,
      var(--c-pink)   40%,
      var(--c-red)    60%,
      var(--c-orange) 80%,
      var(--c-yellow) 100%
    );
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px;
  padding: 40px;
  max-width: 720px;
  width: 88vw;
  max-height: 88vh;
  overflow-y: auto;
  box-shadow: 0 32px 80px rgba(0,0,0,0.7);
}

.sheet-cover {
  width: 160px;
  min-width: 160px;
  aspect-ratio: 2/3;
  object-fit: cover;
  border-radius: 6px;
  box-shadow: 0 8px 28px rgba(0,0,0,0.5);
}

.sheet-info { flex: 1; min-width: 0; }

.sheet-title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.sheet-author {
  color: var(--c-yellow);
  font-weight: 300;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.sheet-summary {
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(255,255,255,0.95);
  text-shadow: 0 1px 8px rgba(0,0,0,0.45);
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.97) translateY(12px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

@media (max-width: 900px) {
  .books-3d-grid { grid-template-columns: repeat(2, 1fr); }
  .book-3d-card:nth-child(4) { grid-column: auto; margin-left: 0; }
  .reader-inner { flex-direction: column; align-items: center; }
}

@media (max-width: 600px) {
  .site-header { padding: 0 92px 0 130px; }
  .logo-placeholder { width: 96px; height: 52px; font-size: 10px; }
  .logo-img { height: 52px; max-width: 150px; }
  .qr-placeholder, .qr-img { width: 52px; height: 52px; }
  .section-selection, .section-collection { padding: 40px 20px; }
  .books-3d-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .sheet-inner { flex-direction: column; align-items: center; }
  .sheet-cover { width: 120px; min-width: 120px; }
  .reader-inner { padding: 28px 18px; }
  .book-list-row { padding: 12px 14px; gap: 12px; }
  .book-list-cover, .book-list-placeholder { width: 38px; height: 54px; min-width: 38px; }
}

@media (prefers-reduced-motion: reduce) {
  .book-3d-card:hover .book-3d-inner,
  .book-list-row:hover { transform: none; }
}