/* Reset */
:root {
    --container-padding: 1.5em;
    --container-width: 1260px;
  }
  
  * {
    &,
    &::before,
    &::after {
      box-sizing: border-box;
    }
  }
  
  body {
    margin: 0;
    font: 1em/160% sans-serif;
  }
  
  img {
    max-width: 100%;
    vertical-align: middle;
    height: auto;
  }
  
  .page-container {
    padding: var(--container-padding);
    max-width: var(--container-width);
    margin-right: auto;
    margin-left: auto;
  }
  
  /* Gallery layout */
  :root {
    --gallery-gap: 1.5em;
    --gallery-items-per-row: 1;
  }
  
  .img-gallery {
    display: flex;
    flex-wrap: wrap;
    gap: var(--gallery-gap);
  }
  
  /* 
   * Width of each item = Wi
   * Container width = Wc
   * Gap between items = g
   * Items per row in the gallery = n
   * Total space coverd by gaps = G
   * Available space for items per row = Wa
   *
   * G = g * (n - 1)
   * Wa = Wc - G
   * Wi = Wa / n
   */
  .img-gallery__item {
    flex: 0 0
      calc(
        (100% - (var(--gallery-gap) * (var(--gallery-items-per-row) - 1))) /
          var(--gallery-items-per-row)
      );
  
    img {
      border-radius: var(--gallery-item-border-radius);
      aspect-ratio: 3 / 2;
      object-fit: cover;
    }
  }
  
  @media only screen and (width >= 1024px) {
    .img-gallery {
      --gallery-items-per-row: 4;
    }
  }
  
  @media only screen and (768px < width < 1024px) {
    .img-gallery {
      --gallery-items-per-row: 3;
    }
  }
  
  @media only screen and (540px < width < 768px) {
    .img-gallery {
      --gallery-items-per-row: 2;
    }
  }
  
  /* Gallery styles */
  :root {
    --gallery-item-border-radius: 0.4em;
    --gallery-caption-bg-color: hsl(0 0% 0% / 90%);
    --gallery-caption-text-color: white;
  }
  
  .img-gallery__item {
    position: relative;
    overflow: hidden;
    border-radius: var(--gallery-item-border-radius);
  
    figure {
      margin: 0;
    }
  
    figcaption {
      position: absolute;
      inset: auto auto 0 0;
  
      width: 100%;
      padding: 1rem;
  
      color: var(--gallery-caption-text-color);
      background-color: var(--gallery-caption-bg-color);
  
      transition: opacity 0.25s ease-in-out;
      opacity: 0;
    }
  
    &:hover {
      figcaption {
        opacity: 1;
      }
    }
  }