/* ============================================================
   PDF READER REALE (PDF.js) — controlli custom, pagine vere
   Senza JS / senza PDF.js: link "Apri il PDF" (fallback).
   ============================================================ */
.pdf-reader { position: relative; width: 100%; }

/* ---- Fallback (nessun JS / PDF.js non disponibile) ---- */
.pdf-fallback {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-bright);
  border: 0.5px solid var(--border-strong);
  border-radius: var(--radius-sm);
}
.pdf-fallback:hover { color: var(--fg); border-color: var(--accent); }
.pdf-reader.is-enhanced .pdf-fallback { display: none; }

/* ---- Reader attivo ---- */
.pdf-reader.is-enhanced {
  border-radius: var(--radius-sm);
  overflow: hidden;
  outline: 1px solid var(--t-faint);
  background: #0b0710;
}
.pdf-stage {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(120% 120% at 50% 0%, #140b20 0%, #0b0710 72%);
  min-height: 240px;
  padding: var(--space-2);
  touch-action: pan-y;          /* lo swipe orizzontale lo gestiamo noi */
  user-select: none;
}
/* il canvas con la pagina del PDF */
.pdf-reader .pdf-frame {
  display: block;
  max-width: 100%;
  height: auto;
  background: #fff;             /* la "carta" sotto la pagina */
  border-radius: 4px;
  box-shadow: 0 18px 50px -18px rgba(0, 0, 0, 0.9);
  transition: opacity var(--t-med) var(--ease);
}

/* ---- Frecce laterali ---- */
.pdf-nav {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 22%;
  max-width: 130px;
  display: flex;
  align-items: center;
  border: none;
  background: transparent;
  color: #fff;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--t-med) var(--ease);
  z-index: 2;
}
.pdf-nav-prev {
  left: 0;
  justify-content: flex-start;
  padding-left: var(--space-3);
  background: linear-gradient(to right, rgba(0, 0, 0, 0.5), transparent);
}
.pdf-nav-next {
  right: 0;
  justify-content: flex-end;
  padding-right: var(--space-3);
  background: linear-gradient(to left, rgba(0, 0, 0, 0.5), transparent);
}
.pdf-reader:hover .pdf-nav,
.pdf-reader:focus-within .pdf-nav { opacity: 0.9; }
.pdf-nav:hover { opacity: 1; }
.pdf-nav:disabled { opacity: 0; cursor: default; pointer-events: none; }
.pdf-nav svg {
  width: 34px;
  height: 34px;
  filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.85));
}

/* ---- Barra inferiore ---- */
.pdf-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background: rgba(10, 5, 18, 0.6);
  border-top: 0.5px solid var(--border);
  font-family: var(--font-body);
}
.pdf-counter {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--accent-bright);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.pdf-caption {
  flex: 1;
  min-width: 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--fg-mid);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.pdf-bar button,
.pdf-bar a {
  background: none;
  border: none;
  color: var(--fg-mid);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--t-fast);
}
.pdf-bar button:hover,
.pdf-bar a:hover { color: var(--accent-bright); }
.pdf-bar svg { width: 20px; height: 20px; }

/* documento a pagina singola: niente navigazione */
.pdf-reader.is-single .pdf-nav,
.pdf-reader.is-single .pdf-counter { display: none; }

/* ---- Schermo intero ---- */
.pdf-reader:fullscreen,
.pdf-reader:-webkit-full-screen {
  background: #050208;
  display: flex;
  flex-direction: column;
}
.pdf-reader:fullscreen .pdf-stage { flex: 1; }

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .pdf-nav { opacity: 0.7; width: 26%; }    /* su touch le frecce restano visibili */
  .pdf-nav svg { width: 26px; height: 26px; }
  .pdf-caption { font-size: 0.85rem; }
  .pdf-bar { gap: var(--space-2); padding: var(--space-2); }
}

@media (prefers-reduced-motion: reduce) {
  .pdf-frame, .pdf-nav { transition: none; }
}