:root{
  --lb-bg: rgba(0,0,0,.65);
  --lb-caption: #e8e8e8;
  --lb-thumb-size: 72px;
  --lb-gap: 10px;
  --lb-ui-bg: rgba(0,0,0,.55);
  --lb-ui-fg: #fff;
  --lb-img-maxw: 90vw;
  --lb-img-maxh: 70vh;
  --lb-anim: 900ms;
}
.lb-lock{ overflow: hidden; }

.lb-overlay{
  position: fixed; inset: 0;
  background: var(--lb-bg);
  display: flex; flex-direction: column;
  align-items: center; justify-content: flex-start;
  z-index: 9999; opacity: 0; transition: opacity .15s ease;
  padding-top: max(5vh, 56px);
  padding-bottom: 2vh;
  pointer-events: none;
}
.lb-overlay.lb-open{ opacity: 1; pointer-events: auto; }

.lb-stage{ max-width: var(--lb-img-maxw); display: grid; place-items: center; position: relative; }

.lb-img{
  display: block; width: auto; height: auto; max-width: 100%; max-height: var(--lb-img-maxh);
  object-fit: contain; user-select: none;
  box-shadow: 0 10px 40px rgba(0,0,0,.35);
  background: rgba(0,0,0,.15);
  transform-origin: center center;
}
.lb-zoom-in{  animation: lb-zoom-in  var(--lb-anim) ease both; }
.lb-zoom-out{ animation: lb-zoom-out var(--lb-anim) ease both; }
@keyframes lb-zoom-in{ from{ transform: scale(.6); opacity:.25; } to{ transform: scale(1); opacity:1; } }
@keyframes lb-zoom-out{ from{ transform: scale(1); opacity:1; } to{ transform: scale(.6); opacity:0; } }

.lb-toolbar{
  position: absolute; top: -44px; right: 0;
  display: inline-flex; gap: 6px; align-items: center;
  background: var(--lb-ui-bg); color: var(--lb-ui-fg);
  padding: 6px 8px; border-radius: 6px;
}
.lb-btn{
  appearance: none; border: 0; background: transparent;
  color: inherit; cursor: pointer; font-size: 18px;
  line-height: 1; padding: 4px 6px; border-radius: 4px;
}
.lb-btn:focus{ outline: 2px solid #fff; }
.lb-btn-close::before{ content: "\00D7"; font-size: 22px; } /* × */

.lb-pager{
  position: absolute; top: -44px; left: 0;
  background: var(--lb-ui-bg); color: var(--lb-ui-fg);
  padding: 6px 8px; border-radius: 6px;
  font: 14px/1 Roboto, Arial, sans-serif;
}

/* Pfeilkreise */
.lb-nav{
  position: fixed; top: 50%; transform: translateY(-50%);
  width: 40px; height: 40px; display: grid; place-items: center;
  background: var(--lb-ui-bg); color: var(--lb-ui-fg);
  border-radius: 20px; cursor: pointer; user-select: none;
  border: 2px solid rgba(255,255,255,.35);
  box-sizing: border-box; z-index: 10000;
}
.lb-prev::before{ content: "\2039"; font-size: 28px; } /* ‹ */
.lb-next::before{ content: "\203A"; font-size: 28px; } /* › */

/* Caption */
.lb-caption{
  color: var(--lb-caption);
  margin-top: 30px;
  width: min(80vw, 960px);
  text-align: center;
  font: 400 18px/1.4 Roboto, Arial, sans-serif;
}

/* Thumbs */
.lb-thumbs{
  display: flex; gap: var(--lb-gap); justify-content: center;
  margin-top: 30px; margin-bottom: 30px;
  overflow-x: auto; width: min(80vw, 960px);
  margin-inline: auto;
}
.lb-thumb{
  flex: 0 0 auto;
  width: var(--lb-thumb-size);
  height: calc(var(--lb-thumb-size)*0.75);
  object-fit: cover; cursor: pointer; border-radius: 2px;
  border: 10px solid rgba(128,128,128,.30);
  opacity: .7; transition: opacity .15s ease, outline-color .15s ease;
  outline: 2px solid transparent;
}
.lb-thumb:hover{ opacity: .9; }
.lb-thumb.lb-active{ opacity: 1; outline-color: #fff; }

/* Dots-Fallback, Mittelpunkt liegt auf Bildunterkante */
.lb-dots{
  position: absolute; left: 50%; top: 0; transform: translate(-50%, -50%);
  display: none; gap: 8px; pointer-events: auto; z-index: 10001;
}
.lb-dot{
  width: 36px; height: 36px; display: grid; place-items: center;
  background: var(--lb-ui-bg); color: var(--lb-ui-fg);
  border-radius: 50%; border: 2px solid rgba(255,255,255,.35);
  font: 14px/1 Roboto, Arial, sans-serif; cursor: pointer; user-select: none;
}
.lb-dot.lb-active{ outline: 2px solid #fff; outline-offset: 0; }

/* Meldungen */
.lb-error{
  margin-top: 12px; color: #fff;
  font: 14px/1.4 Roboto, Arial, sans-serif;
}

/* Cursor bei Drag */
.lb-grabbing{ cursor: grabbing !important; }

@media (max-height: 520px){
  .lb-toolbar, .lb-pager{ top: 6px; }
}