body {
  margin: 0;
  background: #111;
  display: flex;
  justify-content: center;
}

/* contenedor general */
#viewer {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* cada página */
.page {
  position: relative;
  margin: 25px 0;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

/* canvas SIN deformar */
canvas {
  display: block;
}

/* 🔥 watermark fuerte pero elegante */
.watermark {
  position: absolute;
  inset: 0;

  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;

  font-size: 60px;
  font-weight: bold;
  letter-spacing: 2px;

  color: rgba(255,255,255,0.06);

  transform: rotate(-25deg);

  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}