/* ===== QVegas Flipbook Viewer ===== */
.flipbook-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.95);
  flex-direction: column;
}
.flipbook-overlay.active { display: flex; }
.flipbook-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--dark);
  border-bottom: 1px solid var(--dark-border);
  flex-shrink: 0;
  z-index: 10;
}
.flipbook-toolbar-title {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--white);
  font-weight: 600;
}
.flipbook-toolbar-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.flipbook-toolbar-controls button {
  background: var(--dark-surface);
  border: 1px solid var(--dark-border);
  color: var(--light);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.85rem;
  font-family: var(--font-body);
  transition: all 0.2s;
}
.flipbook-toolbar-controls button:hover {
  background: var(--dark-card);
  border-color: var(--neon-purple);
  color: var(--white);
}
.flipbook-close {
  background: none !important;
  border: none !important;
  font-size: 1.5rem !important;
  padding: 0.25rem 0.5rem !important;
  color: var(--light-muted) !important;
}
.flipbook-close:hover { color: var(--white) !important; }
.page-indicator {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--light-muted);
  min-width: 80px;
  text-align: center;
}
.flipbook-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  user-select: none;
}
.flipbook-container {
  position: relative;
  perspective: 2000px;
}
.flipbook-spread {
  display: flex;
  position: relative;
}
.flipbook-page {
  position: relative;
  background: #fff;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
  overflow: hidden;
  flex-shrink: 0;
}
.flipbook-page canvas {
  display: block;
  width: 100%;
  height: 100%;
}
.flipbook-page.blank { background: #f5f5f5; }
.flip-container {
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.645, 0.045, 0.355, 1);
  transform-origin: left center;
  z-index: 10;
}
.flip-container.flip-right {
  right: 0;
  left: auto;
  transform-origin: left center;
}
.flip-container.flip-left {
  left: 50%;
  transform-origin: left center;
}
.flip-container .flip-front,
.flip-container .flip-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  overflow: hidden;
}
.flip-container .flip-front { z-index: 2; }
.flip-container .flip-front canvas,
.flip-container .flip-back canvas {
  display: block;
  width: 100%;
  height: 100%;
}
.flip-container .flip-back {
  transform: rotateY(180deg);
  background: #fff;
}
.flip-container.flipping { transform: rotateY(-180deg); }
.flip-container::after {
  content: '';
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: 40px;
  background: linear-gradient(to left, rgba(0,0,0,0.15), transparent);
  z-index: 3;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s;
}
.flip-container:hover::after { opacity: 1; }
.flip-container.flipping::after { opacity: 0; }
.flipbook-spread::after {
  content: '';
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 30px; height: 100%;
  background: linear-gradient(to right,
    rgba(0,0,0,0.2), rgba(0,0,0,0.05) 30%,
    transparent 50%, rgba(0,0,0,0.05) 70%, rgba(0,0,0,0.2));
  z-index: 5;
  pointer-events: none;
}
.flipbook-spread.single-page::after { display: none; }
.flip-nav {
  position: absolute;
  top: 0;
  width: 25%;
  height: 100%;
  cursor: pointer;
  z-index: 4;
  display: flex;
  align-items: center;
}
.flip-nav-prev { left: 0; justify-content: flex-start; padding-left: 1rem; }
.flip-nav-next { right: 0; justify-content: flex-end; padding-right: 1rem; }
.flip-nav-arrow {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  opacity: 0;
  transition: opacity 0.2s;
  backdrop-filter: blur(4px);
}
.flip-nav:hover .flip-nav-arrow { opacity: 1; }
.flipbook-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 20;
}
.flipbook-loading-bar {
  width: 200px; height: 3px;
  background: var(--dark-border);
  border-radius: 2px;
  overflow: hidden;
}
.flipbook-loading-fill {
  height: 100%;
  background: var(--vegas-glow);
  border-radius: 2px;
  transition: width 0.3s;
  width: 0%;
}
.flipbook-loading-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--light-muted);
}
@media (max-width: 768px) {
  .flipbook-spread { justify-content: center; }
  .flip-nav-arrow { opacity: 0.6; width: 32px; height: 32px; font-size: 1rem; }
  .flipbook-toolbar { padding: 0.5rem 1rem; }
  .flipbook-toolbar-title { font-size: 0.85rem; }
}