/* ============================================================
   通用图片灯箱 · lightbox.css
   配套脚本：lightbox.js（结构由脚本注入，页面无需写 DOM）
   使用范围：case-01…05、lab 等所有二级页
   ============================================================ */

/* 打开时锁住页面滚动 */
html.lb-lock{overflow:hidden}

/* 内容图给放大光标；缩略图条本身是切换器，保持手型；装饰图不提示 */
.case-detail img{cursor:zoom-in}
.case-detail .gallery-thumbs img,
.case-detail .wv-thumbs img{cursor:pointer}
.case-detail [aria-hidden="true"] img{cursor:default}

/* ---------- 遮罩层：半透明深色 + 背景模糊 ---------- */
.lb{
  position:fixed;inset:0;z-index:1200;
  display:flex;flex-direction:column;
  padding:clamp(12px,2vw,26px) clamp(12px,3vw,44px) 0;
  background:rgba(8,19,34,.82);
  -webkit-backdrop-filter:blur(22px) saturate(112%);
  backdrop-filter:blur(22px) saturate(112%);
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .32s ease,visibility 0s linear .32s;
  overscroll-behavior:contain;
  -webkit-user-select:none;user-select:none;
  -webkit-tap-highlight-color:transparent;
}
.lb.is-open{opacity:1;visibility:visible;pointer-events:auto;transition:opacity .32s ease,visibility 0s}

/* ---------- 舞台与图片 ---------- */
.lb-stage{
  position:relative;flex:1 1 auto;min-height:0;width:100%;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
  touch-action:pan-y;
}
.lb-scroll{
  display:flex;align-items:center;justify-content:center;
  max-width:100%;max-height:100%;border-radius:8px;
  transition:transform .28s cubic-bezier(.2,.8,.3,1);
}
.lb-scroll.is-dragging{transition:none}
/* 长图：撑满舞台并在内部纵向滚动 */
.lb-scroll.is-long{
  display:block;width:100%;height:100%;max-width:100%;max-height:100%;
  overflow-y:auto;overflow-x:hidden;
  overscroll-behavior:contain;-webkit-overflow-scrolling:touch;
  scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.3) transparent;
}
.lb-scroll.is-long::-webkit-scrollbar{width:6px}
.lb-scroll.is-long::-webkit-scrollbar-thumb{background:rgba(255,255,255,.28);border-radius:3px}
.lb-scroll.is-long::-webkit-scrollbar-track{background:transparent}
/* 放大后交给 JS 平移，避免和原生滚动抢手势 */
.lb-scroll.is-zoomed{overflow:hidden;touch-action:none}

.lb-img{
  display:block;width:auto;height:auto;max-width:100%;max-height:100%;
  border-radius:8px;
  box-shadow:0 32px 90px rgba(0,0,0,.5);
  opacity:0;transform-origin:center center;
  transition:opacity .3s ease;
  will-change:transform;
  -webkit-user-drag:none;user-select:none;
}
.lb-img.is-ready{opacity:1}
.lb-scroll.is-long .lb-img{margin:0 auto}
.lb-img.is-anim{transition:opacity .3s ease,transform .22s cubic-bezier(.2,.8,.3,1)}

/* ---------- 左右切换 ---------- */
.lb-arrow{
  position:absolute;top:50%;z-index:2;
  display:flex;align-items:center;justify-content:center;
  width:48px;height:48px;margin-top:-24px;padding:0 0 3px;
  border:1px solid rgba(255,255,255,.22);border-radius:50%;
  background:rgba(255,255,255,.12);color:#fff;
  font-size:26px;line-height:1;cursor:pointer;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.lb-arrow:hover{background:#fff;color:#0e2440;border-color:#fff;transform:scale(1.06)}
.lb-arrow:active{transform:scale(.97)}
/* 箭头贴近图片：位置由 lightbox.js 量出图片宽度后写入 --lb-side */
.lb-prev{left:var(--lb-side,0)}
.lb-next{right:var(--lb-side,0)}
.lb-arrow[hidden]{display:none}

.lb-close{
  position:absolute;z-index:3;
  top:clamp(10px,2vw,20px);right:clamp(10px,2vw,20px);
  display:flex;align-items:center;justify-content:center;
  width:44px;height:44px;padding:0 0 2px;
  border:1px solid rgba(255,255,255,.22);border-radius:50%;
  background:rgba(255,255,255,.12);color:#fff;
  font-size:24px;line-height:1;cursor:pointer;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.lb-close:hover{background:#fff;color:#0e2440;border-color:#fff;transform:rotate(90deg)}

/* ---------- 底部说明 ---------- */
.lb-bar{
  flex:0 0 auto;width:100%;max-width:1220px;margin:0 auto;
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;
  padding:18px 4px calc(22px + env(safe-area-inset-bottom));
  color:#fff;
}
.lb-meta{min-width:0}
.lb-title{display:block;font-size:16px;font-weight:600;line-height:1.5;letter-spacing:.005em}
.lb-desc{display:block;margin-top:5px;font-size:13px;line-height:1.6;color:rgba(255,255,255,.62)}
.lb-count{
  flex:0 0 auto;padding-bottom:2px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:rgba(255,255,255,.45);white-space:nowrap;
}
.lb-count b{color:#fff;font-weight:500}
.lb-count i{margin:0 3px;font-style:normal;color:rgba(255,255,255,.3)}

/* ---------- 加载与提示 ---------- */
.lb-spinner{
  position:absolute;left:50%;top:50%;z-index:2;
  width:26px;height:26px;margin:-13px 0 0 -13px;
  border:2px solid rgba(255,255,255,.22);border-top-color:#fff;border-radius:50%;
  opacity:0;transition:opacity .2s ease;animation:lbSpin .8s linear infinite;
  pointer-events:none;
}
.lb.is-loading .lb-spinner{opacity:1}
@keyframes lbSpin{to{transform:rotate(360deg)}}

.lb-hint{
  position:absolute;left:50%;bottom:12px;z-index:2;margin:0;
  transform:translateX(-50%);
  padding:6px 14px;border-radius:999px;
  border:1px solid rgba(255,255,255,.14);
  background:rgba(7,18,34,.55);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  font-size:12px;line-height:1.4;letter-spacing:.02em;
  color:rgba(255,255,255,.62);white-space:nowrap;
  opacity:0;transition:opacity .45s ease;pointer-events:none;
}
.lb-hint.is-show{opacity:1}

/* 右下信息区：长图提示 + 计数 */
.lb-aside{position:relative;flex:0 0 auto;display:flex;flex-direction:column;align-items:flex-end}
.lb-longtag{
  position:absolute;right:0;bottom:100%;margin-bottom:6px;
  font-size:11.5px;letter-spacing:.04em;line-height:1.4;
  color:rgba(255,255,255,.6);white-space:nowrap;
  opacity:0;transition:opacity .3s ease;
}
.lb.is-long .lb-longtag{opacity:1}

/* ---------- 窄屏 ---------- */
@media (max-width:700px){
  .lb{padding:8px 10px 0}
  .lb-bar{padding:12px 4px calc(14px + env(safe-area-inset-bottom));gap:14px;align-items:flex-start}
  .lb-title{font-size:14px;line-height:1.45}
  .lb-desc{font-size:12px;line-height:1.55;margin-top:3px}
  .lb-count{font-size:11px;padding-top:2px}
  .lb-arrow{width:36px;height:36px;margin-top:-18px;font-size:21px}
  .lb-close{width:38px;height:38px;font-size:21px}
  .lb-hint{font-size:11px;bottom:6px}
  .lb-img{border-radius:6px}
  .lb-longtag{font-size:10.5px}
}
@media (max-height:520px){
  .lb-hint,.lb-longtag{display:none}
  .lb-bar{padding-top:10px;padding-bottom:10px}
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  .lb,.lb-img,.lb-scroll,.lb-hint,.lb-longtag{transition:none!important}
  .lb-spinner{animation-duration:2s}
}