.lightbox-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.85);
  align-items: center;
  justify-content: center;
}
.lightbox-overlay.is-open {
  display: flex;
}
.lightbox-box {
  position: relative;
  max-width: 92vw;
  max-height: 90vh;
  background: #fff;
  border-radius: 5px;
  box-shadow: 0 5px 25px rgba(0, 0, 0, 0.5);
  padding: 14px 14px 0 14px;
  display: flex;
  flex-direction: column;
}
.lightbox-content {
  /* 用 text-align 置中＋overflow-y 捲動，不要用 flex align-items:center 做垂直置中——
     內容比容器高的時候（例如很長的表單截圖），flex 置中在部分瀏覽器會捲不到最上面，
     見 [[frontend/help.html]] 的滿版表單截圖踩過這個問題。 */
  overflow-y: auto;
  overflow-x: hidden;
  text-align: center;
}
.lightbox-img {
  display: inline-block;
  max-width: calc(92vw - 28px);
}
.lightbox-footer {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 8px 4px;
  color: #535353;
  font-size: 0.85rem;
}
.lightbox-title {
  flex: 1;
  text-align: left;
}
.lightbox-counter {
  color: #949494;
}
.lightbox-close,
.lightbox-prev,
.lightbox-next {
  border: 0;
  background: none;
  color: #949494;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  color: #50785a;
}
.lightbox-close {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 26px;
  height: 26px;
  font-size: 20px;
  border-radius: 50%;
  z-index: 1;
}
.lightbox-close:hover {
  background: #f3efe8;
}
.lightbox-prev,
.lightbox-next {
  width: 22px;
  height: 22px;
  font-size: 14px;
}
@media (max-width: 640px) {
  .lightbox-box { padding: 10px 10px 0 10px; }
  .lightbox-img { max-width: calc(96vw - 20px); }
}