* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: #fff;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}
.blocked {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  padding: 20px;
}
.blocked.show { display: flex; }
.blocked img {
  width: 80px;
  height: 80px;
  margin-bottom: 20px;
}
.blocked p {
  font-size: 15px;
  color: #555;
  text-align: center;
  line-height: 1.6;
}
.blocked .hint {
  margin-top: 24px;
  font-size: 13px;
  color: #999;
  text-align: left;
  background: #f5f5f5;
  border-radius: 8px;
  padding: 14px 18px;
  line-height: 1.8;
}
.blocked .hint strong {
  color: #333;
}
.pdf-wrap {
  display: none;
  width: 100vw;
  height: 100vh;
  overflow: auto;
}
.pdf-wrap.show { display: block; }
canvas {
  display: block;
  margin: 0 auto;
}