/* ==========================================================================
   PDF VIEWER COMPONENT STYLES (Zero External Dependencies)
   ========================================================================== */

:root {
  --im-bg: #F8F5F0;
  --im-surface: #FFFFFF;
  --im-primary: #A8492C;
  --im-secondary: #4E5D38;
  --im-accent: #C59A45;
  --im-text-dark: #2A2421;
  --im-text-muted: #7D736C;
  --im-border: rgba(168, 73, 44, 0.16);
  --im-shadow: 0 10px 30px rgba(42, 36, 33, 0.12);
  --im-shadow-floating: 0 8px 24px rgba(168, 73, 44, 0.15);
  --im-radius: 12px;
  --im-font-family: inherit;
  --im-dock-icon-size: 15px;
  --im-side-icon-size: 18px;
}

.intermezzo-pdf-viewer {
  position: relative;
  width: 100%;
  height: 700px;
  min-height: 380px;
  display: flex;
  flex-direction: column;
  background-color: var(--im-bg);
  user-select: none;
  -webkit-user-select: none;
  overflow: hidden;
  box-sizing: border-box;
  font-family: var(--im-font-family, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif);
  color: var(--im-text-dark);
}

.intermezzo-pdf-viewer * {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

/* Viewport Area - Internal scroll disabled, native vertical page scroll allowed */
.intermezzo-pdf-viewer .im-viewport {
  flex: 1;
  position: relative;
  z-index: 1;
  overflow: hidden;
  display: flex;
  padding: 1.5rem 1rem 5.5rem 1rem;
  touch-action: pan-y pinch-zoom;
}

/* Desktop Drag-to-Pan cursor states */
.intermezzo-pdf-viewer .im-viewport.im-can-pan {
  cursor: grab;
}

.intermezzo-pdf-viewer .im-viewport.im-is-panning {
  cursor: grabbing !important;
  user-select: none !important;
  -webkit-user-select: none !important;
}

.intermezzo-pdf-viewer .im-viewport.im-is-panning * {
  cursor: grabbing !important;
  pointer-events: none;
}

/* Book Spread & Single Page Presentation */
.intermezzo-pdf-viewer .im-pages-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  margin: auto; /* Ensures perfect centering when small, full pan reachability without clipping when zoomed */
  transform-origin: center center;
}

/* Page Card Styling - Instant display with zero flicker */
.intermezzo-pdf-viewer .im-page-card {
  position: relative;
  background: var(--im-surface);
  border-radius: 6px;
  box-shadow: var(--im-shadow), 0 0 0 1px rgba(168, 73, 44, 0.08);
  overflow: hidden;
  display: none;
  line-height: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: filter 0.35s ease;
}

.intermezzo-pdf-viewer.im-has-swipe-hint .im-page-card {
    filter: blur(4px) brightness(0.82);
    /*filter: blur(4px);*/
}

.intermezzo-pdf-viewer .im-page-card.visible {
  display: block;
}

.intermezzo-pdf-viewer .im-page-card canvas {
  display: block;
  width: 100%;
  height: auto;
}

/* Side floating buttons (Desktop) */
.intermezzo-pdf-viewer .im-side-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  max-width: 44px;
  max-height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--im-border);
  color: var(--im-text-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(42, 36, 33, 0.1);
  padding: 0;
  margin: 0;
  overflow: hidden;
  line-height: 1;
  transition: transform 0.15s ease, background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

/* Strict side icon constraints */
.intermezzo-pdf-viewer .im-side-btn i,
.intermezzo-pdf-viewer .im-side-btn svg,
.intermezzo-pdf-viewer .im-side-btn .e-font-icon-svg {
  width: var(--im-side-icon-size, 18px) !important;
  height: var(--im-side-icon-size, 18px) !important;
  max-width: var(--im-side-icon-size, 18px) !important;
  max-height: var(--im-side-icon-size, 18px) !important;
  min-width: var(--im-side-icon-size, 18px) !important;
  min-height: var(--im-side-icon-size, 18px) !important;
  font-size: var(--im-side-icon-size, 18px) !important;
  line-height: 1 !important;
  display: block !important;
  margin: auto !important;
  vertical-align: middle;
}

.intermezzo-pdf-viewer .im-side-btn svg[fill="none"] {
  fill: none !important;
  stroke: currentColor !important;
}

.intermezzo-pdf-viewer .im-side-btn:hover {
  background: var(--im-primary);
  color: #FFF;
  border-color: var(--im-primary);
  transform: translateY(-50%) scale(1.06);
}

.intermezzo-pdf-viewer .im-side-btn.prev { left: 1.25rem; }
.intermezzo-pdf-viewer .im-side-btn.next { right: 1.25rem; }

/* Floating Bottom Action Dock */
.intermezzo-pdf-viewer .im-toolbar-dock {
  position: absolute;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--im-border);
  border-radius: 36px;
  padding: 0.35rem 0.65rem;
  box-shadow: var(--im-shadow-floating);
}

.intermezzo-pdf-viewer .im-dock-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.intermezzo-pdf-viewer .im-divider {
  width: 1px;
  height: 20px;
  background: var(--im-border);
  margin: 0 0.2rem;
}

.intermezzo-pdf-viewer .im-btn {
  width: 36px;
  height: 36px;
  min-width: 36px;
  min-height: 36px;
  max-width: 36px;
  max-height: 36px;
  border-radius: 50%;
  border: 1px solid transparent;
  background: transparent;
  color: var(--im-text-dark);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  text-decoration: none;
  padding: 0;
  margin: 0;
  overflow: hidden;
  line-height: 1;
  transition: background-color 0.15s ease, color 0.15s ease;
}

/* Strict dock icon constraints */
.intermezzo-pdf-viewer .im-btn i,
.intermezzo-pdf-viewer .im-btn svg,
.intermezzo-pdf-viewer .im-btn .e-font-icon-svg {
  width: var(--im-dock-icon-size, 15px) !important;
  height: var(--im-dock-icon-size, 15px) !important;
  max-width: var(--im-dock-icon-size, 15px) !important;
  max-height: var(--im-dock-icon-size, 15px) !important;
  min-width: var(--im-dock-icon-size, 15px) !important;
  min-height: var(--im-dock-icon-size, 15px) !important;
  font-size: var(--im-dock-icon-size, 15px) !important;
  line-height: 1 !important;
  display: block !important;
  margin: auto !important;
  vertical-align: middle;
}

.intermezzo-pdf-viewer .im-btn svg[fill="none"] {
  fill: none !important;
  stroke: currentColor !important;
}

.intermezzo-pdf-viewer .im-btn:hover {
  background: var(--im-primary);
  color: #FFF;
}

.intermezzo-pdf-viewer .im-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  background: transparent !important;
  color: var(--im-text-muted) !important;
}

/* Page Label & Mode Indicator */
.intermezzo-pdf-viewer .im-page-indicator {
  font-size: 0.86rem;
  font-weight: 600;
  padding: 0 0.4rem;
  color: var(--im-text-dark);
  white-space: nowrap;
  min-width: 60px;
  text-align: center;
  line-height: 1;
}

.intermezzo-pdf-viewer .im-zoom-label {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--im-text-muted);
  min-width: 40px;
  text-align: center;
  line-height: 1;
}

/* Loader & Spinner */
.intermezzo-pdf-viewer .im-loader-overlay {
  position: absolute;
  inset: 0;
  background: var(--im-bg);
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.25s ease, visibility 0.25s;
}

.intermezzo-pdf-viewer .im-loader-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.intermezzo-pdf-viewer .im-spinner {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 3px solid var(--im-border);
  border-top-color: var(--im-primary);
  animation: imSpin 0.85s linear infinite;
  margin-bottom: 0.85rem;
}

@keyframes imSpin {
  to { transform: rotate(360deg); }
}

.intermezzo-pdf-viewer .im-loader-text {
  font-size: 1.05rem;
  color: var(--im-primary);
}

/* Mobile Swipe Hint Overlay (First Visit) */
.intermezzo-pdf-viewer .im-swipe-hint {
  display: none;
}

/* Responsive Breakpoints */
@media (max-width: 899px) {
  .intermezzo-pdf-viewer .im-side-btn {
    display: none !important;
  }
  .intermezzo-pdf-viewer .im-viewport {
    padding: 0.5rem 0.35rem 4.75rem 0.35rem;
    overflow: hidden;
    touch-action: pan-y pinch-zoom;
  }
  .intermezzo-pdf-viewer .im-pages-wrapper {
    gap: 0;
    max-width: 100%;
  }
  .intermezzo-pdf-viewer .im-page-card {
    box-shadow: 0 4px 16px rgba(42, 36, 33, 0.1), 0 0 0 1px rgba(168, 73, 44, 0.08);
  }
  .intermezzo-pdf-viewer .im-toolbar-dock {
    bottom: 0.75rem;
    padding: 0.28rem 0.55rem;
    gap: 0.35rem;
  }
  .intermezzo-pdf-viewer .im-btn {
    width: 34px;
    height: 34px;
    min-width: 34px;
    min-height: 34px;
    max-width: 34px;
    max-height: 34px;
  }
  .intermezzo-pdf-viewer .im-page-indicator {
    font-size: 0.88rem;
    min-width: 52px;
    padding: 0 0.25rem;
  }
  .intermezzo-pdf-viewer .im-zoom-label {
    font-size: 0.78rem;
    min-width: 36px;
  }
  .intermezzo-pdf-viewer .im-hide-mobile {
    display: none !important;
  }

  /* Mobile Swipe Hint Canvas Overlay */
  .intermezzo-pdf-viewer .im-swipe-hint {
    position: absolute;
    inset: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.35s ease, visibility 0.35s ease;
    visibility: hidden;
    cursor: pointer;
    background: transparent;
    -webkit-tap-highlight-color: transparent;
  }

  .intermezzo-pdf-viewer .im-swipe-hint.im-visible {
    opacity: 1;
    pointer-events: auto;
    visibility: visible;
  }

  .intermezzo-pdf-viewer .im-swipe-hint-card {
    position: relative;
    z-index: 2;
    background: rgba(36, 30, 26, 0.94);
    color: #FFFFFF;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 20px;
    padding: 1.5rem 1.85rem;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
    max-width: min(320px, calc(100% - 2.5rem));
    transform: scale(0.92);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .intermezzo-pdf-viewer .im-swipe-hint.im-visible .im-swipe-hint-card {
    transform: scale(1);
  }

  .intermezzo-pdf-viewer .im-swipe-hint-animation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.1rem;
    margin-bottom: 0.2rem;
  }

  .intermezzo-pdf-viewer .im-swipe-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .intermezzo-pdf-viewer .im-swipe-arrow.left {
    animation: imArrowPulseLeft 1.8s ease-in-out infinite;
  }

  .intermezzo-pdf-viewer .im-swipe-arrow.right {
    animation: imArrowPulseRight 1.8s ease-in-out infinite;
  }

  .intermezzo-pdf-viewer .im-swipe-arrow svg {
    width: 20px;
    height: 20px;
    stroke: rgba(255, 255, 255, 0.65);
  }

  .intermezzo-pdf-viewer .im-swipe-hand {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: imSwipeHandMotion 1.8s ease-in-out infinite;
  }

  .intermezzo-pdf-viewer .im-swipe-hand svg {
    width: 36px;
    height: 36px;
    stroke: var(--im-accent, #C59A45);
  }

  .intermezzo-pdf-viewer .im-swipe-hint-title {
    font-size: 1.12rem;
    font-weight: 600;
    color: #FFFFFF;
    letter-spacing: 0.01em;
    line-height: 1.3;
  }

  .intermezzo-pdf-viewer .im-swipe-hint-sub {
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.65);
    font-weight: 400;
  }

  @keyframes imSwipeHandMotion {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-12px); }
    75% { transform: translateX(12px); }
  }

  @keyframes imArrowPulseLeft {
    0%, 100% { opacity: 0.35; transform: translateX(0); }
    25% { opacity: 1; transform: translateX(-3px); }
  }

  @keyframes imArrowPulseRight {
    0%, 100% { opacity: 0.35; transform: translateX(0); }
    75% { opacity: 1; transform: translateX(3px); }
  }
}