body {
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  margin: 0;
  padding: 0;
}
header {
  background-color: #003366;
  color: white;
  padding: 1rem;
  text-align: center;
}
nav {
  background-color: #005599;
  padding: 0.5rem;
  display: flex;
  gap: 1rem;
  justify-content: center;
}
nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}
.container {
  padding: 2rem;
  max-width: 900px;
  margin: auto;
  background-color: white;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.content-page {
  user-select: none;
}
img.render-page, iframe.secure-pdf {
  width: 100%;
  display: block;
  margin-bottom: 2rem;
  pointer-events: none;
}
#marca-agua {
  position: fixed;
  bottom: 10px;
  right: 10px;
  opacity: 0.4;
  font-size: 12px;
  pointer-events: none;
}