/* Lightbox 样式 */
.img-popup {
  cursor: pointer;
  transition: 0.3s;
  margin: 10px 10px 10px 0;
}

.img-popup:hover {
  opacity: 0.9;
}

.popup-bg {
  display: none;
  position: fixed;
  z-index: 9999;
  padding-top: 60px;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0.85);
}

.popup-bg img {
  margin: auto;
  display: block;
  max-width: 90%;
  max-height: 85%;
}

.popup-close {
  position: absolute;
  top: 30px;
  right: 40px;
  color: #fff;
  font-size: 40px;
  cursor: pointer;
}

/* PDF 按钮样式 */
.pdf-btn {
  display: inline-block;
  padding: 12px 25px;
  background-color: #1a73e8;
  color: #fff;
  font-weight: bold;
  text-decoration: none;
  border-radius: 5px;
  margin-top: 10px;
  transition: 0.3s;
}

.pdf-btn:hover {
  background-color: #155ab6;
}