* {
  box-sizing: border-box;
}

#gallery {
  display: flex;
  justify-content: center;
  align-items: center;
}

#gallery .container {
  display: flex;
  justify-content: center;
  align-items: center;
}

#gallery body {
  display: grid;
  place-items: center;
  min-height: 100vh;
}
#gallery ul {
  display: flex;
  width: calc(80% - 2rem);
  padding: 0;
  margin: 0;
  list-style-type: none;
}
#gallery li {
  padding: 0;
}
#gallery img {
  max-width: 100%;
  width: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  transition: all 0.2s ease;
}
#gallery ul:is(:hover, :focus-within) img {
  opacity: calc(0.1 + (var(--active-lerp, 0) * 0.9));
  filter: grayscale(calc(1 - var(--active-lerp, 0)));
}

#overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease;
}

#image-container {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 10px;
  overflow: hidden;
  z-index: 10000;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.8);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

#image-container.open {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1.2);
}

#expanded-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
}


 :root {
  --lerp-0: 1;
  --lerp-1: 0.5787037;
  --lerp-2: 0.2962963;
  --lerp-3: 0.125;
  --lerp-4: 0.037037;
  --lerp-5: 0.0046296;
  --lerp-6: 0;
}
#gallery a {
  outline-offset: 4px;
}
#gallery li {
  flex: calc(1.0 + (var(--active-lerp, 0) * 1));
  transition: flex 0.2s ease;
}
 li:is(:hover, :focus-within) {
  --active-lerp: var(--lerp-0);
  z-index: 7;
}
 li:has( + li:is(:hover, :focus-within)),
li:is(:hover, :focus-within) + li {
  --active-lerp: var(--lerp-1);
  z-index: 6;
}
 li:has( + li + li:is(:hover, :focus-within)),
li:is(:hover, :focus-within) + li + li {
  --active-lerp: var(--lerp-2);
  z-index: 5;
}
 li:has( + li + li + li:is(:hover, :focus-within)),
li:is(:hover, :focus-within) + li + li + li {
  --active-lerp: var(--lerp-3);
  z-index: 4;
}
 li:has( + li + li + li + li:is(:hover, :focus-within)),
 li:is(:hover, :focus-within) + li + li + li + li {
  --active-lerp: var(--lerp-4);
  z-index: 3;
}
 li:has( + li + li + li + li + li:is(:hover, :focus-within)),
li:is(:hover, :focus-within) + li + li + li + li + li {
  --active-lerp: var(--lerp-5);
  z-index: 2;
}
 li:has( + li + li + li + li + li + li:is(:hover, :focus-within)),
li:is(:hover, :focus-within) + li + li + li + li + li + li {
  --active-lerp: var(--lerp-6);
  z-index: 1;
}