/* El PDF ocupa toda la pantalla */
html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow: hidden; /* elimina scroll extra */
}

.pdf-viewer {
  width: 100%;
  height: 100%;
  border: none;
}

/* Botón flotante */
.download-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #0078d7;
  color: white;
  text-decoration: none;
  font-size: 22px;
  border-radius: 50%;
  padding: 14px 18px;
  box-shadow: 0px 4px 10px rgba(0,0,0,0.3);
  transition: background 0.3s, transform 0.2s;
  z-index: 1000; /* siempre encima del PDF */
}

.download-btn:hover {
  background: #005bb5;
  transform: scale(1.1);
}

/* Responsivo */
@media (max-width: 480px) {
  .download-btn {
    font-size: 20px;
    padding: 12px 16px;
    bottom: 15px;
    right: 15px;
  }
}