* {
  box-sizing: border-box;
}

html {
  background: #fff;
}

body {
  margin: 0;
  background: #fff;
}

.gallery {
  columns: 3;
  column-gap: 20px;
  width: min(1620px, calc(100% - 40px));
  margin: 0 auto;
  padding: 20px 0;
}

.photo {
  display: block;
  width: 100%;
  margin: 0 0 20px;
  padding: 0;
  break-inside: avoid;
  border: 0;
  background: #f4f4f4;
  cursor: zoom-in;
  overflow: hidden;
}

.photo img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 280ms ease, opacity 280ms ease;
}

.photo:hover img {
  transform: scale(1.015);
  opacity: 0.94;
}

.viewer {
  width: 100vw;
  max-width: none;
  height: 100vh;
  max-height: none;
  margin: 0;
  padding: 24px;
  border: 0;
  background: rgba(255, 255, 255, 0.97);
}

.viewer[open] {
  display: grid;
  place-items: center;
}

.viewer::backdrop {
  background: rgba(255, 255, 255, 0.88);
}

.viewer img {
  display: block;
  max-width: 94vw;
  max-height: 92vh;
  object-fit: contain;
}

.viewer-close {
  position: fixed;
  top: 14px;
  right: 20px;
  z-index: 1;
  padding: 0;
  border: 0;
  color: #111;
  background: transparent;
  cursor: pointer;
  font: 300 42px/1 Arial, sans-serif;
}

@media (max-width: 900px) {
  .gallery {
    columns: 2;
    column-gap: 14px;
    width: calc(100% - 28px);
    padding: 14px 0;
  }

  .photo {
    margin-bottom: 14px;
  }
}

@media (max-width: 520px) {
  .gallery {
    columns: 1;
    width: calc(100% - 20px);
    padding: 10px 0;
  }

  .photo {
    margin-bottom: 10px;
  }
}