/* Lightbox 基本樣式 */
#lb-overlay {
  position: fixed; inset: 0; display: none;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
}
#lb-overlay.open { display: flex; align-items: center; justify-content: center; }

#lb-image {
  max-width: 92vw; max-height: 92vh;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  border-radius: 8px;
}

.lb-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  border: none; background: rgba(255,255,255,0.15);
  font-size: 36px; line-height: 1; width: 48px; height: 48px;
  border-radius: 999px; cursor: pointer; user-select: none;
}
.lb-prev { left: 24px; }
.lb-next { right: 24px; }
.lb-close { top: 24px; right: 24px; transform: none; font-size: 28px; }

.lb-btn:hover { background: rgba(255,255,255,0.25); }

.lb-zoomable { cursor: zoom-in; }

/* 開啟時禁止背景卷動 */
.lb-noscroll { overflow: hidden; }