/* Modal generale */
.modal {
  display: flex; /* Sempre presente per il layout */
  position: fixed;
  z-index: 1000;
  left: 0; 
  top: 0;
  width: 100%; 
  height: 100%;
  background-color: rgba(0,0,0,0.5);
  opacity: 0;
  visibility: hidden;
  pointer-events: none; /* Disabilita i click quando il modal è nascosto */
  overflow: auto;
  justify-content: center;
  align-items: center;
}

/* Animazioni fade-in e fade-out */
@keyframes fadeInAnimation {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeOutAnimation {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* Classe per l'apertura con fade-in */
.modal.fadeIn {
  animation: fadeInAnimation 0.5s ease forwards;
  visibility: visible;
  pointer-events: auto;
}

/* Classe per la chiusura con fade-out */
.modal.fadeOut {
  animation: fadeOutAnimation 0.5s ease forwards;
}
  
.modal-content {
  background-color: #fefefe;
  margin: auto;
  padding: 20px;
  border: 1px solid #888;
  width: 90%;
  max-width: 1400px;
  border-radius: 8px;
  position: relative;
  display: flex; 
  flex-direction: column; 
  align-items: center;
  height: 90vh;
  overflow: hidden;
  --viewer-padding: clamp(16px, 2vw, 28px);
  --control-size: 36px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Spinner */
.loading {
  position: absolute;
  top: 50%; 
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2em;
  color: #ef4c23;
  z-index: 1200;
}

.pdf-error {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 32px;
  background: rgba(255,255,255,0.96);
  text-align: center;
  z-index: 1210;
}

.pdf-error[hidden] {
  display: none;
}

.pdf-error-message {
  max-width: 32rem;
  color: #333;
  font-size: 1rem;
  line-height: 1.5;
}

.pdf-error-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.pdf-error-button,
.pdf-error-link {
  min-height: 44px;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
}

.pdf-error-button {
  border: none;
  background: #c6421c;
  color: #fff;
  cursor: pointer;
}

.pdf-error-link {
  background: transparent;
  border: 1px solid #ef4c23;
  color: #ef4c23;
  text-decoration: none;
}

/* Container PDF */
#pdfViewer {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  gap: 20px;
  overflow-x: auto; 
  overflow-y: hidden;
  width: 100%; 
  height: 100%;
  padding: var(--viewer-padding);
  scroll-behavior: smooth;
  scroll-snap-type: none;
  box-sizing: border-box;
  scrollbar-width: thin;
  scrollbar-color: rgba(239,76,35,0.75) rgba(0,0,0,0.08);
}

#pdfViewer::-webkit-scrollbar {
  height: 12px;
}

#pdfViewer::-webkit-scrollbar-track {
  background: rgba(0,0,0,0.08);
  border-radius: 999px;
}

#pdfViewer::-webkit-scrollbar-thumb {
  background: rgba(239,76,35,0.75);
  border-radius: 999px;
}

#pdfViewer::-webkit-scrollbar-thumb:hover {
  background: rgba(239,76,35,0.95);
}

#pdfViewer.loaded {
  scroll-snap-type: x mandatory;
  --pdfWidth: 600px;
}

#pdfViewer.loaded::before,
#pdfViewer.loaded::after {
  content: "";
  flex: 0 0 max(var(--viewer-padding), calc((100% - var(--pdfWidth)) / 2));
}

#pdfViewer.loaded .pdf-page {
  position: relative;
  flex: 0 0 auto;
  width: var(--page-width);
  height: var(--page-height);
  scroll-snap-align: center;
  scroll-snap-stop: always;
}

#pdfViewer.loaded canvas {
  scroll-snap-align: center;
  display: block;
  border: 1px solid #ddd;
  border-radius: 5px;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #fff;
}

.pdf-text-layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  opacity: 1;
  line-height: 1;
  user-select: text;
  -webkit-user-select: text;
  -webkit-touch-callout: default;
  touch-action: auto;
  z-index: 2;
}

.pdf-text-layer span,
.pdf-text-layer br {
  color: transparent;
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
}

.pdf-text-layer ::selection {
  background: rgba(45, 124, 136, 0.25);
}

.pdf-link-annotation {
  position: absolute;
  z-index: 3;
}

.page-indicator {
  position: absolute;
  left: 50%;
  bottom: max(18px, calc(var(--viewer-padding) - 2px));
  transform: translateX(-50%);
  min-width: calc(var(--control-size) * 2.25);
  height: var(--control-size);
  padding: 0 14px;
  border-radius: 999px;
  background-color: rgba(198,66,28,0.92);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  font-weight: 600;
  box-shadow: 0 4px 10px rgba(0,0,0,0.18);
  z-index: 1150;
  pointer-events: none;
}

/* Pulsanti di navigazione nel PDF viewer */
.nav-button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(198,66,28,0.92);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: var(--control-size); 
  height: var(--control-size);
  cursor: pointer;
  font-size: 1em;
  display: flex; 
  align-items: center; 
  justify-content: center;
  transition: background-color 0.2s ease, opacity 0.5s ease;
  z-index: 1100;
}

.nav-button i {
  margin: 0;
  display: block;
}

.nav-button:hover {
  background-color: rgba(198,66,28,1);
}

.nav-button:focus-visible,
.pdf-error-button:focus-visible,
.pdf-error-link:focus-visible {
  outline: 3px solid #1b5fcc;
  outline-offset: 3px;
}

.modal-close-button {
  top: 18px;
  right: 18px;
  transform: none;
  z-index: 1220;
  box-shadow: 0 4px 10px rgba(0,0,0,0.18);
}

/* Aumentiamo il distanziamento dal bordo per i pulsanti di navigazione */
#prevBtn {
  left: 40px; /* Aumentato da 20px a 40px */
}
#nextBtn {
  right: 40px; /* Aumentato da 20px a 40px */
}

/* Classe "hidden" per la dissolvenza in/out */
.nav-button.hidden {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 600px) {
  .modal-content {
    width: 96%;
    height: 92vh;
    padding: 14px;
    --viewer-padding: 12px;
  }

  #pdfViewer {
    gap: 12px;
  }

  #prevBtn {
    left: 12px;
  }

  #nextBtn {
    right: 12px;
  }

  .modal-close-button {
    top: 12px;
    right: 12px;
  }

  .page-indicator {
    bottom: 12px;
    font-size: 0.85rem;
    min-width: calc(var(--control-size) * 2);
  }

  .pdf-error {
    padding: 24px 18px;
  }

  .pdf-error-actions {
    flex-direction: column;
    width: 100%;
  }

  .pdf-error-button,
  .pdf-error-link {
    width: 100%;
    justify-content: center;
  }
}