/* =====================================================================
   X-TRAL 3D CATALOGUE FLIPBOOK — LUXURY EDITORIAL (HINDWARE STYLE)
   Clean Studio Aesthetic · Fullscreen Large Spread · Cursor Drag/Swap
   ===================================================================== */

:root {
  --fb-bg-stage: radial-gradient(ellipse at 50% 45%, #ffffff 0%, #f4f6f9 55%, #e6ebf0 100%);
  --fb-header-bg: #ffffff;
  --fb-text-main: #142224;
  --fb-text-muted: #5e7073;
  --fb-brand-teal: #2B676E;
  --fb-brand-gold: #dfb15b;
  --fb-border-light: #e4e8eb;
  --fb-shadow-book: 0 25px 65px -10px rgba(18, 38, 41, 0.22), 0 10px 24px -6px rgba(18, 38, 41, 0.14);
}

* {
  box-sizing: border-box;
  -webkit-user-drag: none !important;
  user-drag: none !important;
}

body.flipbook-page-body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: var(--fb-bg-stage);
  color: var(--fb-text-main);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  user-select: none;
  -webkit-user-select: none;
  display: flex;
  flex-direction: column;
}

/* ==================== TOP NAVIGATION HEADER (HINDWARE LOOK) ==================== */
.fb-header {
  position: relative;
  z-index: 50;
  height: 60px;
  background: var(--fb-header-bg);
  border-bottom: 1px solid var(--fb-border-light);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
  flex-shrink: 0;
}

.fb-brand {
  display: flex;
  align-items: center;
  gap: 16px;
}

.fb-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fb-text-main);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 6px;
  background: #f4f6f8;
  border: 1px solid #e2e6ea;
  transition: all 0.2s ease;
}

.fb-back-btn:hover {
  background: #e9ecef;
  color: var(--fb-brand-teal);
  transform: translateX(-2px);
}

.fb-title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.fb-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--fb-text-main);
  letter-spacing: -0.01em;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 480px;
}

.fb-header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.fb-header-btn {
  background: #ffffff;
  border: 1px solid #d5dbde;
  color: var(--fb-text-main);
  padding: 7px 15px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.fb-header-btn:hover {
  background: #f7f9fa;
  border-color: #b8c1c5;
  color: var(--fb-brand-teal);
}

.fb-header-btn--primary {
  background: var(--fb-brand-teal);
  color: #ffffff;
  border-color: var(--fb-brand-teal);
}

.fb-header-btn--primary:hover {
  background: #205056;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(43, 103, 110, 0.28);
}

/* ==================== MAIN STAGE ==================== */
.fb-stage {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 10px 20px 80px;
  box-sizing: border-box;
  width: 100vw;
  height: calc(100vh - 60px);
  cursor: grab;
}

.fb-stage.is-dragging,
.fb-stage:active {
  cursor: grabbing !important;
}

/* Studio Floor Soft Contact Shadow */
.fb-stage-ground-shadow {
  position: absolute;
  bottom: 65px;
  left: 50%;
  transform: translateX(-50%);
  width: 85%;
  max-width: 1650px;
  height: 40px;
  background: radial-gradient(ellipse at center, rgba(16, 36, 40, 0.28) 0%, rgba(16, 36, 40, 0.08) 55%, transparent 75%);
  filter: blur(14px);
  pointer-events: none;
  z-index: 2;
  transition: width 0.65s cubic-bezier(0.25, 1, 0.35, 1), max-width 0.65s cubic-bezier(0.25, 1, 0.35, 1), opacity 0.4s ease;
}

.fb-stage.has-cover .fb-stage-ground-shadow,
.fb-stage.has-back .fb-stage-ground-shadow {
  width: 46%;
  max-width: 820px;
}

/* ==================== BOOK CONTAINER ==================== */
.fb-book-wrapper {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 1820px;
  perspective: 2500px;
  cursor: grab;
}

.fb-book-wrapper.is-dragging,
.fb-book-wrapper:active {
  cursor: grabbing !important;
}

.fb-book-container {
  position: relative;
  background: transparent;
  cursor: grab;
  transform: translate3d(0, 0, 0);
  transition: transform 0.65s cubic-bezier(0.25, 1, 0.35, 1);
  will-change: transform;
}

/* Centered closed state when viewing Front Cover */
.fb-book-container.is-cover {
  transform: translate3d(-25%, 0, 0);
}

/* Centered closed state when viewing Back Cover */
.fb-book-container.is-back-cover {
  transform: translate3d(25%, 0, 0);
}

/* Open 2-page spread state */
.fb-book-container.is-open {
  transform: translate3d(0, 0, 0);
}

@media (max-width: 767px) {
  .fb-stage {
    padding: 8px 10px 70px;
    align-items: center;
    justify-content: center;
  }

  .fb-book-wrapper {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1500px;
  }

  .fb-book-container,
  .fb-book-container.is-cover,
  .fb-book-container.is-back-cover,
  .fb-book-container.is-open {
    transform: translate3d(0, 0, 0) !important;
    margin: 0 auto !important;
    min-width: 0 !important;
    max-width: 100% !important;
  }

  /* In mobile single-page view, remove 2-page paper stack edges */
  .fb-book-container::before,
  .fb-book-container::after {
    display: none !important;
  }

  /* Remove spine binding gradient so single pages look clean and complete */
  .page-binding-shadow {
    display: none !important;
  }

  /* Single clean page shadow on mobile */
  .fb-book-container .stf__wrapper {
    box-shadow: 0 16px 40px -10px rgba(18, 38, 41, 0.28), 0 6px 18px -4px rgba(18, 38, 41, 0.16) !important;
    border-radius: 6px;
    overflow: hidden;
  }

  .flip-page {
    border-radius: 6px;
    overflow: hidden;
  }

  .stf__item {
    border-radius: 6px;
  }
}

/* Stacked paper edge thickness */
.fb-book-container::before,
.fb-book-container::after {
  content: '';
  position: absolute;
  top: 4px;
  bottom: 4px;
  width: 8px;
  z-index: -1;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    #ffffff 0px,
    #eae7df 1px,
    #ffffff 2px,
    #d9d4c7 3px
  );
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  transition: opacity 0.4s ease;
}

.fb-book-container::before {
  left: -6px;
  border-radius: 3px 0 0 3px;
  border-left: 1px solid rgba(0, 0, 0, 0.1);
}

.fb-book-container::after {
  right: -6px;
  border-radius: 0 3px 3px 0;
  border-right: 1px solid rgba(0, 0, 0, 0.1);
}

/* When viewing Front Cover: hide left paper stack, show right paper stack */
.fb-book-container.is-cover::before {
  display: none !important;
}

/* When viewing Back Cover: hide right paper stack, show left paper stack */
.fb-book-container.is-back-cover::after {
  display: none !important;
}

/* StPageFlip block overrides with 60fps GPU acceleration */
.stf__parent {
  position: relative !important;
  display: block !important;
  margin: 0 auto !important;
  cursor: grab !important;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

.stf__wrapper {
  cursor: grab !important;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  transition: box-shadow 0.4s ease;
}

/* Drop shadow applied dynamically: full spread shadow when open, single page shadow when cover */
.fb-book-container.is-open .stf__wrapper {
  box-shadow: 0 25px 65px -10px rgba(18, 38, 41, 0.22), 0 10px 24px -6px rgba(18, 38, 41, 0.14) !important;
}

.fb-book-container.is-cover .flip-page--front,
.fb-book-container.is-cover .stf__item.--right {
  box-shadow: 0 25px 65px -10px rgba(18, 38, 41, 0.28), 0 10px 24px -6px rgba(18, 38, 41, 0.16) !important;
  border-radius: 2px 4px 4px 2px;
}

.fb-book-container.is-back-cover .flip-page--back,
.fb-book-container.is-back-cover .stf__item.--left {
  box-shadow: 0 25px 65px -10px rgba(18, 38, 41, 0.28), 0 10px 24px -6px rgba(18, 38, 41, 0.16) !important;
  border-radius: 4px 2px 2px 4px;
}

/* Spine edge shadow when front cover is closed */
.fb-book-container.is-cover .flip-page--front::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 16px;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.24) 0%, rgba(0, 0, 0, 0.08) 50%, transparent 100%);
  z-index: 10;
  pointer-events: none;
}

/* Spine edge shadow when back cover is closed */
.fb-book-container.is-back-cover .flip-page--back::before {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 16px;
  background: linear-gradient(to left, rgba(0, 0, 0, 0.24) 0%, rgba(0, 0, 0, 0.08) 50%, transparent 100%);
  z-index: 10;
  pointer-events: none;
}

.fb-book-container.is-open .flip-page--front::before,
.fb-book-container.is-open .flip-page--back::before {
  display: none !important;
}

.stf__block {
  cursor: grab !important;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

.stf__item {
  -webkit-backface-visibility: hidden !important;
  backface-visibility: hidden !important;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
  will-change: transform;
}

.stf__outerShadow,
.stf__innerShadow,
.stf__hardShadow,
.stf__hardInnerShadow {
  pointer-events: none !important;
  will-change: transform, opacity;
}

/* ==================== INDIVIDUAL PAGES ==================== */
.flip-page {
  background-color: #ffffff;
  overflow: hidden;
  box-sizing: border-box;
  position: relative;
  box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.03);
  cursor: grab !important;
  -webkit-backface-visibility: hidden !important;
  backface-visibility: hidden !important;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

.flip-page:active {
  cursor: grabbing !important;
}

.page-inner {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: grab;
  transform: translateZ(0);
  -webkit-transform: translateZ(0);
}

/* Center book spine fold shadow */
.flip-page.--left .page-binding-shadow {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  width: 45px;
  background: linear-gradient(to left, rgba(0, 0, 0, 0.16) 0%, rgba(0, 0, 0, 0.04) 50%, transparent 100%);
  pointer-events: none !important;
  z-index: 5;
}

.flip-page.--right .page-binding-shadow {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 45px;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.16) 0%, rgba(0, 0, 0, 0.04) 50%, transparent 100%);
  pointer-events: none !important;
  z-index: 5;
}

/* Paper lighting */
.page-paper-lighting {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 40%, rgba(255, 255, 255, 0.06) 0%, rgba(0, 0, 0, 0.02) 100%);
  pointer-events: none !important;
  z-index: 4;
}

/* High-res rendered image: FILLS THE ENTIRE PAGE WITHOUT BORDERS */
.page-render-img {
  width: 100%;
  height: 100%;
  object-fit: fill;
  display: block;
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none !important;
  user-select: none !important;
  background: #ffffff;
}

.page-render-img.is-loaded {
  opacity: 1;
}

/* Custom cover fills page completely without white paper borders */
.page-render-img.is-custom-cover {
  object-fit: cover !important;
  width: 100% !important;
  height: 100% !important;
}

.flip-page--front,
.flip-page--front .page-inner,
.flip-page--back,
.flip-page--back .page-inner {
  background: #ffffff !important;
}

.flip-page--front .page-footer-num,
.flip-page--back .page-footer-num {
  display: none !important;
}

.page-loader-shimmer {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: #fafaf8;
  z-index: 2;
  transition: opacity 0.3s ease;
  pointer-events: none !important;
}

.page-loader-shimmer.is-hidden {
  opacity: 0;
  display: none;
}

.page-shimmer-ring {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(43, 103, 110, 0.15);
  border-top-color: var(--fb-brand-teal);
  border-radius: 50%;
  animation: fb-spin 0.85s cubic-bezier(0.5, 0.1, 0.5, 0.9) infinite;
}

.page-shimmer-label {
  font-size: 13px;
  font-weight: 600;
  color: #7d8c8f;
}

@keyframes fb-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Page corner peeling hint */
.page-corner-hint {
  position: absolute;
  bottom: 0;
  width: 44px;
  height: 44px;
  cursor: pointer;
  z-index: 8;
  opacity: 0.65;
  transition: opacity 0.2s, transform 0.2s ease;
}

.flip-page.--right .page-corner-hint {
  right: 0;
  background: linear-gradient(135deg, transparent 50%, rgba(43, 103, 110, 0.15) 50%, rgba(0, 0, 0, 0.12) 100%);
  border-radius: 0 0 3px 0;
}

.flip-page.--left .page-corner-hint {
  left: 0;
  background: linear-gradient(225deg, transparent 50%, rgba(43, 103, 110, 0.15) 50%, rgba(0, 0, 0, 0.12) 100%);
  border-radius: 0 0 0 3px;
}

.page-corner-hint:hover {
  opacity: 1;
  transform: scale(1.1);
}

/* Page footer label */
.page-footer-num {
  position: absolute;
  bottom: 8px;
  font-size: 11px;
  font-weight: 600;
  color: #a3adb0;
  z-index: 6;
  pointer-events: none !important;
}

.flip-page.--left .page-footer-num {
  left: 14px;
}

.flip-page.--right .page-footer-num {
  right: 14px;
}

/* ==================== SIDE FLIP NAVIGATION ARROWS ==================== */
.fb-side-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 35;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid #dbe1e4;
  color: var(--fb-text-main);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

.fb-side-btn:hover {
  background: var(--fb-brand-teal);
  color: #ffffff;
  border-color: var(--fb-brand-teal);
  transform: translateY(-50%) scale(1.1);
  box-shadow: 0 8px 24px rgba(43, 103, 110, 0.25);
}

.fb-side-btn:active {
  transform: translateY(-50%) scale(0.95);
}

.fb-side-btn--prev {
  left: 20px;
}

.fb-side-btn--next {
  right: 20px;
}

.fb-side-btn.is-disabled {
  opacity: 0.2;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==================== FLOATING BOTTOM CONTROL DOCK ==================== */
.fb-dock {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 40px;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.12);
  transition: transform 0.2s ease;
}

.fb-dock-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.fb-dock-divider {
  width: 1px;
  height: 22px;
  background: #e2e6ea;
  margin: 0 6px;
}

.fb-dock-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid transparent;
  background: transparent;
  color: #49585a;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.fb-dock-btn:hover {
  background: #f0f3f5;
  color: var(--fb-brand-teal);
  transform: translateY(-1px);
}

.fb-dock-btn:active {
  transform: translateY(1px);
}

.fb-dock-btn.is-active {
  background: rgba(43, 103, 110, 0.12);
  color: var(--fb-brand-teal);
  border-color: rgba(43, 103, 110, 0.25);
}

.fb-dock-btn.is-disabled {
  opacity: 0.25;
  cursor: not-allowed;
  pointer-events: none;
}

.fb-page-counter {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--fb-text-main);
  padding: 4px 10px;
  border-radius: 20px;
  background: #f2f5f7;
  border: 1px solid #dde2e5;
}

.fb-page-input {
  min-width: 48px;
  max-width: 80px;
  background: #ffffff;
  border: 1px solid #c7d0d4;
  border-radius: 4px;
  color: var(--fb-brand-teal);
  font-weight: 700;
  font-size: 13px;
  text-align: center;
  padding: 2px 6px;
  outline: none;
}

.fb-page-input:focus {
  border-color: var(--fb-brand-teal);
  box-shadow: 0 0 0 2px rgba(43, 103, 110, 0.2);
}

.fb-page-total {
  color: #7e8d90;
  font-size: 12px;
}

.fb-dock-btn[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  bottom: 48px;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: #142224;
  color: #ffffff;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 5px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: all 0.16s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.fb-dock-btn:hover[data-tip]::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ==================== THUMBNAIL DRAWER ==================== */
.fb-drawer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 70;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  border-top: 1px solid #dee2e6;
  padding: 16px 24px 24px;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.12);
  transform: translateY(100%);
  transition: transform 0.32s cubic-bezier(0.16, 1, 0.3, 1);
}

.fb-drawer.is-open {
  transform: translateY(0);
}

.fb-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.fb-drawer-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--fb-text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.fb-drawer-close {
  background: #f0f2f4;
  border: none;
  color: #49585a;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: all 0.2s ease;
}

.fb-drawer-close:hover {
  background: #e2e6ea;
  color: #000;
}

.fb-thumb-strip {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 6px 4px 12px;
  scrollbar-width: thin;
}

.fb-thumb-item {
  flex: 0 0 140px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  border-radius: 6px;
  padding: 4px;
  transition: transform 0.2s ease;
}

.fb-thumb-item:hover {
  transform: translateY(-4px);
}

.fb-thumb-item.is-current .fb-thumb-preview {
  border-color: var(--fb-brand-teal);
  box-shadow: 0 0 0 2px var(--fb-brand-teal), 0 6px 16px rgba(43, 103, 110, 0.25);
}

.fb-thumb-preview {
  width: 140px;
  height: 98px;
  background: #ffffff;
  border-radius: 4px;
  border: 1px solid #d5dbde;
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.fb-thumb-preview img {
  width: 100%;
  height: 100%;
  object-fit: fill;
  display: block;
}

.fb-thumb-placeholder {
  font-size: 11px;
  color: #8b989a;
  font-weight: 600;
}

.fb-thumb-label {
  font-size: 12px;
  font-weight: 600;
  color: #556669;
}

/* ==================== INITIAL LOADING SCREEN ==================== */
.fb-loader-screen {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  color: var(--fb-text-main);
  transition: opacity 0.4s ease, visibility 0.4s ease;
}

.fb-loader-screen.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.fb-loader-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.fb-loader-logo {
  height: 48px;
  width: auto;
}

.fb-loader-book-anim {
  width: 76px;
  height: 52px;
  position: relative;
  perspective: 500px;
  margin: 0 auto;
}

.fb-loader-base {
  position: absolute;
  top: 0;
  width: 38px;
  height: 52px;
  background: #f0f3f5;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
}

.fb-loader-base.--left {
  left: 0;
  border-radius: 3px 0 0 3px;
  border-right: 1px solid rgba(0, 0, 0, 0.08);
}

.fb-loader-base.--right {
  right: 0;
  border-radius: 0 3px 3px 0;
  border-left: 1px solid rgba(0, 0, 0, 0.08);
}

.fb-loader-page {
  position: absolute;
  top: 0;
  left: 50%;
  width: 38px;
  height: 52px;
  background: linear-gradient(135deg, var(--fb-brand-teal), #1f5056);
  border-radius: 0 3px 3px 0;
  transform-origin: left center;
  animation: fb-book-flip 1.4s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.fb-loader-page:nth-child(3) { animation-delay: 0.12s; }
.fb-loader-page:nth-child(4) { animation-delay: 0.32s; }
.fb-loader-page:nth-child(5) { animation-delay: 0.52s; }

@keyframes fb-book-flip {
  0% { transform: rotateY(0deg); opacity: 1; }
  60% { transform: rotateY(-180deg); opacity: 0.9; }
  100% { transform: rotateY(-180deg); opacity: 0; }
}

.fb-loader-bar-wrap {
  width: 260px;
  height: 4px;
  background: #e9ecef;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.fb-loader-bar {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 0%;
  background: linear-gradient(to right, var(--fb-brand-teal), var(--fb-brand-gold));
  border-radius: 4px;
  transition: width 0.25s ease;
}

.fb-loader-text {
  font-size: 13px;
  color: #6a7c7f;
  font-weight: 500;
}

/* ==================== TOAST NOTIFICATION ==================== */
.fb-toast {
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  background: #142224;
  color: #ffffff;
  padding: 10px 20px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.25);
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
  z-index: 120;
}

.fb-toast.is-show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.fb-toast i {
  color: var(--fb-brand-gold);
}

/* ==================== ZOOM / PAN MODAL ==================== */
.fb-zoom-overlay {
  position: fixed;
  inset: 0;
  z-index: 85;
  background: rgba(14, 28, 30, 0.92);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.fb-zoom-overlay.is-active {
  opacity: 1;
  visibility: visible;
}

.fb-zoom-bar {
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(0, 0, 0, 0.4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
}

.fb-zoom-stage {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  cursor: grab;
}

.fb-zoom-stage:active {
  cursor: grabbing;
}

.fb-zoom-img {
  max-width: none;
  width: 140%;
  height: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.7);
  border-radius: 4px;
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 900px) {
  .fb-stage {
    padding: 10px 14px 75px;
  }

  .fb-title {
    font-size: 15px;
  }

  .fb-side-btn {
    width: 44px;
    height: 44px;
    font-size: 16px;
  }
}

@media (max-width: 640px) {
  .fb-header {
    padding: 0 14px;
    height: 54px;
  }

  .fb-back-btn span {
    display: none;
  }

  .fb-title {
    font-size: 14px;
  }

  .fb-header-actions .fb-header-btn span {
    display: none;
  }

  .fb-stage {
    padding: 8px 8px 70px;
  }

  .fb-side-btn {
    display: none;
  }

  .fb-dock {
    bottom: 10px;
    padding: 6px 10px;
    gap: 4px;
  }

  .fb-dock-btn {
    width: 34px;
    height: 34px;
    font-size: 13px;
  }

  .fb-dock-btn[data-action="first"],
  .fb-dock-btn[data-action="last"],
  .fb-dock-btn[data-action="autoplay"] {
    display: none;
  }
}