/* Główne pudełko */
.os-gallery{--thumb-size:100px; --thumb-gap:12px;}
.os-gallery__main{
  background:#fff;
  width:100%;
  border-radius:12px;
  overflow:hidden;
}
.os-gallery__main img{
  display:block;
  width:100%;
  height:auto;
  max-height:72vh;
  object-fit:contain;          /* nic nie ucina */
  transition:transform .25s ease;
}
.os-gallery__main:hover img{ transform:scale(1.03); } /* delikatne przybliżenie */

/* Miniatury pod spodem */
.os-gallery__thumbs{
  margin-top:14px;
  display:flex;
  flex-wrap:wrap;
  gap:var(--thumb-gap);
}
.os-thumb{
  width:var(--thumb-size);
  height:var(--thumb-size);
  background:#fff;
  border:1px solid #e5e7eb;   /* lekka szarość */
  border-radius:10px;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:4px;
  cursor:pointer;
  transition:border-color .2s ease, box-shadow .2s ease;
}
.os-thumb img{
  max-width:100%;
  max-height:100%;
  object-fit:contain;          /* dopasowane, nie ucięte */
}
.os-thumb:hover{ box-shadow:0 0 0 2px #e5e7eb inset; }
.os-thumb.is-active{ outline:2px solid #000000; outline-offset:2px; } /* zielony akcent */