html.scu-viewer-lock-scroll,
body.scu-viewer-lock-scroll {
  overflow: hidden !important;
  overscroll-behavior: none;
}

.scu-pdf-viewer.scu-fake-fullscreen {
  position: fixed !important;
  inset: 0 !important;
  width: 100vw !important;
  height: 100dvh !important;
  max-width: none !important;
  max-height: none !important;
  margin: 0 !important;
  z-index: 2147483647 !important;
  border-radius: 0 !important;
}

.scu-pdf-viewer.scu-fake-fullscreen .main-container {
  height: calc(100dvh - 54px) !important;
  min-height: 0 !important;
}

.scu-pdf-viewer.scu-fake-fullscreen .bottom-bar {
  position: relative;
  z-index: 2;
}

.scu-pdf-viewer, .scu-pdf-viewer *, .scu-pdf-viewer *::before, .scu-pdf-viewer *::after { box-sizing: border-box; }

.scu-pdf-viewer {
  --scu-viewer-fit-scale: 1;
  background-color: #333333;
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  width: 100%;
  height: clamp(420px, 78vh, 820px);
  min-height: 0;
  overflow: hidden;
  color: white;
  user-select: none;
  position: relative;
  border-radius: 6px;
}

.scu-pdf-viewer .main-container {
  background-color: #333333;
  display: flex;
  flex: 1;
  width: 100%;
  height: calc(100% - 50px);
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.scu-pdf-viewer .viewer-wrapper {
  position: relative;
  width: 900px;
  height: 600px;
  transform: scale(var(--scu-viewer-fit-scale));
  transform-origin: center center;
  flex: 0 0 auto;
}

.scu-pdf-viewer .flipbook-zoom-container {
  transition: transform 0.1s ease-out;
  transform-origin: center center;
  position: absolute;
  left: 0; top: 0;
  width: 900px;
  height: 600px;
  cursor: default;
  z-index: 5;
  touch-action: none;
}
.scu-pdf-viewer .flipbook-zoom-container.zoom-attivo { cursor: grab; }
.scu-pdf-viewer .flipbook-zoom-container.zoom-attivo:active { cursor: grabbing; transition: none; }

/* ── FLIPBOOK ── */
.scu-pdf-viewer #flipbook {
  width: 900px;
  height: 600px;
  position: relative;
  display: none;
  background: #fff;
}

/* ── SLOT PAGINA (sinistra / destra) ── */
.scu-pdf-viewer .page-slot {
  position: absolute;
  top: 0;
  width: 450px;
  height: 600px;
  overflow: hidden;
  background: #fff;
  box-shadow: 0 0 20px rgba(0,0,0,0.5);
}
.scu-pdf-viewer .page-slot.left { left: 0; }
.scu-pdf-viewer .page-slot.right { right: 0; }
.scu-pdf-viewer .page-slot.hidden { display: none; }

/* Immagine WebP dello slot: occupa la pagina logica 450×600 */
.scu-pdf-viewer .page-slot .page-image {
  position: absolute;
  inset: 0;
  width: 450px;
  height: 600px;
  object-fit: fill;
  display: block;
  opacity: 0;
  transition: opacity 0.12s ease-out;
  -webkit-user-drag: none;
  user-select: none;
}

/* Placeholder sfocato */
.scu-pdf-viewer .page-slot .blur-bg {
  position: absolute;
  inset: 0;
  background-size: 100% 100%;
  filter: blur(8px);
  z-index: 0;
}
.scu-pdf-viewer .page-slot .content-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
}

/* ── SPINNER overlay sullo slot ── */
.scu-pdf-viewer .slot-spinner {
  position: absolute;
  inset: 0;
  background: rgba(20,20,20,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.scu-pdf-viewer .slot-spinner.visibile { opacity: 1; }
.scu-pdf-viewer .spinner {
  width: 36px; height: 36px;
  border: 3px solid rgba(255,255,255,0.15);
  border-top-color: #fff;
  border-radius: 50%;
  animation: scu-pdf-spin 0.7s linear infinite;
}
@keyframes scu-pdf-spin { to { transform: rotate(360deg); } }

/* ── FRECCE ── */
.scu-pdf-viewer .nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0,0,0,0.48);
  color: white;
  border: 3px solid rgba(255,255,255,0.35);
  width: 64px; height: 64px;
  border-radius: 50%;
  font-size: 50px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s, opacity 0.2s, transform 0.2s, box-shadow 0.2s;
  z-index: 120;
  box-shadow: 0 4px 24px rgba(0,0,0,0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.scu-pdf-viewer #prev-btn { left: 40px; }
.scu-pdf-viewer #next-btn { right: 40px; }
.scu-pdf-viewer .nav-arrow:hover {
  background-color: rgba(0,0,0,0.72);
  transform: translateY(-50%) scale(1.06);
  box-shadow: 0 6px 30px rgba(0,0,0,0.6);
}
.scu-pdf-viewer .nav-arrow:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: translateY(-50%);
}
.scu-pdf-viewer .nav-arrow.in-loading-hd {
  opacity: 0.65 !important;
  cursor: wait !important;
}
.scu-pdf-viewer .nav-arrow.in-loading-hd:disabled {
  opacity: 0.65 !important;
}

/* ── BOTTOM BAR ── */
.scu-pdf-viewer .bottom-bar {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 50px;
  background-color: #0b0b0b;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 30px;
  box-shadow: 0 -5px 25px rgba(0,0,0,0.6);
  z-index: 100;
}
.scu-pdf-viewer .bar-section { display: flex; align-items: center; gap: 15px; }
.scu-pdf-viewer .page-counter { font-size: 13px; font-weight: 400; color: #aaa; }

.scu-pdf-viewer .zoom-controls { display: flex; align-items: center; gap: 12px; }
.scu-pdf-viewer .zoom-slider {
  -webkit-appearance: none; appearance: none;
  width: 150px; height: 4px;
  background: #333; border-radius: 2px; outline: none;
}
.scu-pdf-viewer .zoom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%; background: #fff; cursor: pointer;
}
.scu-pdf-viewer .icon-btn {
  background: none; border: none;
  color: #999; font-size: 18px;
  cursor: pointer; padding: 5px;
  transition: color 0.2s;
}
.scu-pdf-viewer .icon-btn:hover { color: #fff; }

.scu-pdf-viewer .viewer-message {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  color: #ddd;
  font-size: 15px;
  line-height: 1.45;
  z-index: 30;
  pointer-events: none;
}
.scu-pdf-viewer .viewer-message.errore { color: #ffb4b4; }
.scu-pdf-viewer .viewer-message.hidden { display: none; }

/* ── Repository pagine nascosto ── */
.scu-pdf-viewer #page-repo {
  display: none;
}

.scu-pdf-viewer:fullscreen {
  width: 100vw;
  height: 100vh;
  border-radius: 0;
}

.scu-pdf-viewer:fullscreen .bottom-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
}

.scu-pdf-viewer:fullscreen .main-container {
  height: calc(100% - 50px);
}

/* Embedding/responsive tweaks */
.scu-pdf-viewer .bottom-bar { position: absolute; }
.scu-pdf-viewer .main-container { height: calc(100% - 50px); }
@media (max-width: 991px) {
  .scu-pdf-viewer { min-height: 460px; height: 70vh; }
  .scu-pdf-viewer .viewer-wrapper,
  .scu-pdf-viewer .flipbook-zoom-container,
  .scu-pdf-viewer #flipbook { transform-origin: center center; }
  .scu-pdf-viewer .nav-arrow { width: 48px; height: 48px; font-size: 28px; }
  .scu-pdf-viewer #prev-btn { left: 12px; }
  .scu-pdf-viewer #next-btn { right: 12px; }
}
@media (max-width: 575px) {
  .scu-pdf-viewer { min-height: 390px; height: 62vh; }
  .scu-pdf-viewer .zoom-slider { width: 110px; }
  .scu-pdf-viewer .bottom-bar { padding: 0 12px; }
}

/* Responsive */
.scu-pdf-viewer.scu-pdf-viewer--mobile {
  height: clamp(360px, 72vh, 620px);
}

.scu-pdf-viewer.scu-pdf-viewer--mobile .nav-arrow {
  width: 44px;
  height: 44px;
  font-size: 28px;
}

.scu-pdf-viewer.scu-pdf-viewer--mobile #prev-btn { left: 10px; }
.scu-pdf-viewer.scu-pdf-viewer--mobile #next-btn { right: 10px; }

.scu-pdf-viewer.scu-pdf-viewer--mobile .bottom-bar {
  height: 54px;
  padding: 0 10px;
  gap: 8px;
}

.scu-pdf-viewer.scu-pdf-viewer--mobile .zoom-slider {
  width: min(34vw, 130px);
}

.scu-pdf-viewer.scu-pdf-viewer--mobile .bar-section {
  gap: 8px;
}

.scu-pdf-viewer.scu-pdf-viewer--mobile .page-counter {
  font-size: 12px;
  min-width: 58px;
}

@media (max-width: 480px) {
  .scu-pdf-viewer {
    height: clamp(340px, 68vh, 560px);
  }
  .scu-pdf-viewer .icon-btn {
    font-size: 16px;
    padding: 4px;
  }
  .scu-pdf-viewer .zoom-controls {
    gap: 6px;
  }
}