:root{
  --overlay-bg: rgba(0,0,0,0.56);
  --card-bg: rgba(255,255,255,0.6);
  --radius: 12px;
  --transition: 240ms cubic-bezier(.2,.9,.3,1);
}

  body{
    font-family: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "メイリオ", sans-serif;
    /*padding: 24px;*/
    background: #f7f7f8;
    color: #222;
  }

  .gallery{
    display: grid;
    grid-template-columns: repeat(auto-fit,minmax(200px,1fr));
    gap: 0px;
    max-width: 1100px;
    margin: 0 auto;
  }

  .img-wrap{
    position: relative;
    overflow: hidden;
    border-radius: 0px;
    box-shadow: 0 6px 18px rgba(20,20,30,0.06);
    cursor: pointer;
    background: #eee;
  }

  .img-wrap img{
    display: block;
    width: 100%;
    height: auto;
    vertical-align: middle;
    transition: transform var(--transition);
  }

  /* hover/active image zoom */
  .img-wrap:focus-within img,
  .img-wrap:hover img{
    transform: scale(1.03);
  }

  /* overlay covering the image */
  .overlay{
    position: absolute;
    inset: 0; /* top:0; right:0; bottom:0; left:0; */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    box-sizing: border-box;
    background: transparent;
    pointer-events: none;
  }

  .overlay__card{
    max-width: 90%;
    width: calc(100% - 40px);
    background: var(--card-bg);
    padding: 14px 16px;
    border-radius: var(--radius);
    box-shadow: 0 8px 28px rgba(8,12,20,0.18);
    transform: translateY(6px) scale(.98);
    opacity: 0;
    transition: opacity var(--transition), transform var(--transition);
    pointer-events: none;
  }

  .overlay__text{
    font-size: 15px;
    line-height: 1.5;
    color: #111;
    margin-right: 8px;
  }

  .overlay__close{
    border: none;
    background: transparent;
    font-size: 18px;
    padding: 6px;
    cursor: pointer;
    color: #666;
  }

  /* visible state */
  .img-wrap.show .overlay{
    background: var(--overlay-bg);
    pointer-events: auto;
  }

  .img-wrap.show .overlay__card{
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: auto;
  }

  /* close button accessible styling */
  .overlay__close:focus{
    outline: 3px solid rgba(66,133,244,0.25);
    border-radius: 6px;
  }

  /* small caption under image (optional) */
  .caption{
    padding: 10px;
    font-size: 13px;
    color: #555;
    background: #fff;
  }

  /* make overlay card text wrap nicely on small screens */
  @media (max-width:480px){
    .overlay__card{ padding: 12px; font-size: 14px; }
  }