/*!
 * gcms 公用图片灯箱（lightbox）
 * 以 launcher 页原 pd-lb 实现为基准抽离（功能最全的一份：翻页 / 键盘 / 图注 / 滚动锁定）
 * 配合 lightbox.js 使用，页面只需声明容器，不需再写灯箱样式与脚本
 */

/* ===== 灯箱容器 ===== */
.gcms-lb {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  /* 背景虚化：遮罩半透明 + backdrop-filter 模糊页面背景（0.72 透明度让背后页面透出，虚化层次才可见；
     blur 18px + saturate 轻微增饱和，玻璃拟态质感；不支持的浏览器回退为深色半透明遮罩，仍可读） */
  background: rgba(8, 8, 14, 0.72);
  -webkit-backdrop-filter: blur(18px) saturate(1.15);
  backdrop-filter: blur(18px) saturate(1.15);
  opacity: 0;
  visibility: hidden;
  cursor: zoom-out;
  transition: opacity 0.25s ease, visibility 0.25s;
}
.gcms-lb.gcms-lb-on {
  opacity: 1;
  visibility: visible;
}

/* ===== 大图 ===== */
.gcms-lb-img {
  max-width: min(1180px, 92vw);
  max-height: 84vh;
  border-radius: 14px;
  border: 1px solid rgba(139, 92, 246, 0.4);
  box-shadow: 0 32px 90px rgba(0, 0, 0, 0.7);
  transform: scale(0.94);
  transition: transform 0.25s ease;
}
.gcms-lb.gcms-lb-on .gcms-lb-img {
  transform: scale(1);
}

/* ===== 图注（第 N / M 张）===== */
.gcms-lb-cap {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  max-width: 80vw;
  font-size: 13px;
  color: #b9c0d4;
  letter-spacing: 0.5px;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== 操作提示（仅灯箱内展示，打开后自动淡出）=====
   页面未打开时按 ←/→ 无意义，故按键提示只存在于灯箱内；页面侧仅保留「点击放大」发现线索 */
.gcms-lb-hint {
  position: absolute;
  top: 26px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12px;
  color: #b9c0d4;
  letter-spacing: 0.3px;
  white-space: nowrap;
  background: rgba(6, 6, 10, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.gcms-lb-hint-show {
  opacity: 1;
}

/* ===== 关闭 / 翻页按钮 ===== */
.gcms-lb-x,
.gcms-lb-nav {
  position: absolute;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  line-height: 1;
  color: #e8eaf0;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  cursor: pointer;
  user-select: none;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}
.gcms-lb-x:hover,
.gcms-lb-nav:hover {
  border-color: rgba(139, 92, 246, 0.7);
  background: rgba(139, 92, 246, 0.18);
}
/* 翻页箭头 hover 微放大 */
.gcms-lb-nav:hover {
  transform: scale(1.06);
}
/* 翻页箭头：实心 SVG 几何居中（字符 < > 受字体基线影响会视觉偏移；实心 fill 比线条 chevron 重心稳定，贴近参考图） */
.gcms-lb-arr {
  display: block;
  width: 22px;
  height: 22px;
  fill: currentColor;
}
/* 光学居中补偿：实心箭头面积质心偏臂侧（开口侧），向顶点方向微移 0.5px 归中 */
.gcms-lb-prev .gcms-lb-arr {
  transform: translateX(-0.5px);
}
.gcms-lb-next .gcms-lb-arr {
  transform: translateX(0.5px);
}
/* 关闭按钮：打叉比箭头小一号 + hover 旋转 90°（0.3s 顺滑） */
.gcms-lb-x {
  top: 22px;
  right: 26px;
  font-size: 17px;
  transition: border-color 0.15s, background 0.15s, transform 0.3s ease;
}
.gcms-lb-x:hover {
  transform: rotate(90deg) scale(1.06);
}
.gcms-lb-prev {
  left: 26px;
  top: 50%;
  margin-top: -22px;
}
.gcms-lb-next {
  right: 26px;
  top: 50%;
  margin-top: -22px;
}

/* ===== 可点击项：缩略图统一放大镜光标 ===== */
[data-lightbox] img,
.gcms-lb-open {
  cursor: zoom-in;
}

/* ===== 移动端：按钮缩小并避开系统安全区 ===== */
@media (max-width: 640px) {
  .gcms-lb-img {
    max-width: 94vw;
    max-height: 76vh;
    border-radius: 10px;
  }
  .gcms-lb-hint {
    top: calc(14px + env(safe-area-inset-top, 0px));
    font-size: 11px;
    padding: 5px 11px;
  }
  .gcms-lb-x,
  .gcms-lb-nav {
    width: 38px;
    height: 38px;
    font-size: 20px;
  }
  .gcms-lb-x {
    font-size: 15px;
  }
  .gcms-lb-arr {
    width: 20px;
    height: 20px;
  }
  .gcms-lb-x {
    top: calc(12px + env(safe-area-inset-top, 0px));
    right: 12px;
  }
  .gcms-lb-prev {
    left: 10px;
  }
  .gcms-lb-next {
    right: 10px;
  }
  .gcms-lb-cap {
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    font-size: 12px;
  }
}

/* ===== 降低动效偏好 ===== */
@media (prefers-reduced-motion: reduce) {
  .gcms-lb,
  .gcms-lb-img {
    transition: none;
  }
  .gcms-lb-hint {
    transition: none;
  }
}