* {
  margin: 0px;
}

/* custom color for links*/
a:link {
  color: black;
  background-color: black;
  text-decoration: underline;
}

a:visited {
  color: black;
  background-color: transparent;
  text-decoration: underline;
}

a:hover {
  color: white;
  background-color: black;
  text-decoration: underline;
}

body {
  transform: scale(0.95);
  box-sizing: border-box;
  width: 100vw;
  height: 100vh;
  align-content: center;
  overflow: hidden;
  background-image: url(data:image/png;base64,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);
}

.grid {
  box-sizing: border-box;
  display: flex;
  width: 100vw;
  justify-content: center;
  align-items: center;
  background-color: white;
  padding: 2vh;
  /* grain texture (source: https://coderwall.com/p/m-uwvg/css-background-noise */
  background-image: url(data:image/png;base64,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);
  
}

h2 {
  margin-bottom: 1vw;
}

.name {
  font-family: monospace;
  position: absolute;
  left: 1vw;
  top: 10.4vw;
  font-size: 1vw;
}

.instruction-01 {
  font-family: monospace;
  position: absolute;
  left: 30.5vw;
  top: 22.1vw;
  font-size: 1vw;
}

.instruction-02 {
  font-family: monospace;
  position: absolute;
  left: 51vw;
  top: 34.1vw;
  font-size: 1vw;
}

.follow {
  font-family: monospace;
  position: absolute;
  left: 83.3vw;
  top: 45.9vw;
  font-size: 1vw;
  z-index: 4;
}

/* arrow designs */
.year-2017 > *:nth-child(even), .year-2020 > *:nth-child(even){
  box-sizing: border-box;
  font-family: monospace;
  font-size: 0vw;
  width: 0;
  height: 0;
  border-left: 20px solid black;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  transition: 100ms all ease-in-out;
  margin: 0px 10px;
}

.year-2018 > *:nth-child(even), .year-2023 > *:nth-child(even) {
  box-sizing: border-box;
  font-family: monospace;
  font-size: 0vw;
  width: 0;
  height: 0;
  border-right: 20px solid black;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  transition: 100ms all ease-in-out;
  margin: 0px 10px;
}

/* individual HTML id : javascript id = one-text : oneText, two-text : twoText, (...) six-text : sixText */
.year-name {
  text-shadow:
  -1px -1px 0 #fff,
  1px -1px 0 #fff,
  -1px 1px 0 #fff,
  2px 2px 0 #fff;  
  color: black;
  mix-blend-mode: difference;
  text-align: center;
  align-content: center;
  box-sizing: border-box;
  font-family: monospace;
  font-size: 8vw;
  text-wrap: wrap;
  width: 20vw;
  height: 10vw;
  transition: 100ms all ease-in-out;
  border-radius: 1vw;
  z-index: 3;
}

.GIF-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0.7vw;
}

/* individual HTML id : javascript variable = one-GIF : oneGIF, two-GIF : twoGIF, (...) six-GIF : sixGIF */
.GIF-container {
  font-family: monospace;
  position: relative;
  box-sizing: border-box;
  width: 10vw;
  height: 10vw;
  text-align: center;
  border-radius: 1vw;
  overflow: hidden;
  z-index: 3;
}

/* flip card effect (credit: https://codepen.io/ananyaneogi/pen/Ezmyeb) */
.to-flip {
  border-radius: 1vw;
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.8s;
  backface-visibility: hidden;
  background-color: black;

}

.front,
.back {
  border-radius: 1vw;
  position: absolute;
  align-content: center;
  width: 100%;
  height: 100%;
  background-color: black;
}

.front {
  z-index: 2;
  filter: grayscale(1) blur(0.25rem);
  box-shadow: 0 0 5px 20px #555
}

.back {
  z-index: 1;
  transform: rotateY(180deg);
}

.GIF-container:hover {
  background-color: black;
  border: solid black;
  border-width: 0 5px 5px 0;
  transition: 150ms all ease-in-out;
  transition-delay: 350ms;
  top: 0px;
}

.GIF-container:hover .to-flip {
  transform: rotateY(180deg);
}


/* GIF scale-up animations */
.grid.year-2017 .GIF-container:active {
  transform: scale(2) translateY(1.5vw);
}

.grid.year-2018 .GIF-container:active,
.grid.year-2020 .GIF-container:active {
  transform: scale(2) translateX(1.5vw);
}

.grid.year-2023 .GIF-container:active {
  transform: scale(2) translateY(-2vw) translateX(1.5vw);
}

.GIF-container:active {
  transform: scale(2);
  transition: 150ms all ease-in-out;
  z-index: 6;
}

/* NOTES:
'+' : Adjacent Sibling Selector = targets the element immediately following the specified element
'~' : General Sibling Combinator = targets all siblings that come AFTER the specified element, not just the immediate next one
*/

/* expand the even child when its preceding odd child is hovered over EXCLUDING the even children that is the year-name*/
.year-2017 > *:nth-child(odd):hover + *:nth-child(even):not(:nth-child(2)) {
  background-color: white;
  border-radius: 20px;
  border: solid black;
  border-width: 0 5px 5px 0;
  text-wrap: wrap;
  padding: 10px;
  width: 8vw;
  height: 10vw;
  font-size: 0.6vw;
  transition: 300ms all ease-in-out;
  transition-delay: 200ms;
}

.year-2018 > *:nth-child(odd):hover + *:nth-child(even):not(:nth-child(6)):not(:nth-child(10)) {
  background-color: white;
  border-radius: 20px;
  border: solid black;
  border-width: 0 5px 5px 0;
  text-wrap: wrap;
  padding: 10px;
  width: 8vw;
  height: 10vw;
  font-size: 0.6vw;
  transition: 300ms all ease-in-out;
  transition-delay: 200ms;
}

.year-2020 > *:nth-child(odd):hover + *:nth-child(even):not(:nth-child(10)) {
  background-color: white;
  border-radius: 20px;
  border: solid black;
  border-width: 0 5px 5px 0;
  text-wrap: wrap;
  padding: 10px;
  width: 8vw;
  height: 10vw;
  font-size: 0.6vw;
  transition: 300ms all ease-in-out;
  transition-delay: 200ms;
}

.year-2023 > *:nth-child(odd):hover + *:nth-child(even):not(:nth-child(6)):not(:nth-child(12)) {
  background-color: white;
  border-radius: 20px;
  border: solid black;
  border-width: 0 5px 5px 0;
  text-wrap: wrap;
  padding: 10px;
  width: 8vw;
  height: 10vw;
  font-size: 0.6vw;
  transition: 300ms all ease-in-out;
  transition-delay: 200ms;
}