:root {
  --color-white: #fff;
  --color-gray: #2f2f2d;
  --color-gold: #ffd700;
  --color-background: #151513;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  display: flex;
  overflow: hidden;
  align-items: center;
  justify-content: center;
  background-color: var(--color-background);
}

.fibonacci {
  width: 22.25rem;
  height: 13.75rem;
  overflow: hidden;
  position: relative;
  animation: reveal-border 5s linear forwards;
}

.box {
  z-index: 1;
  position: absolute;
  visibility: hidden;
  animation: up-movement 5s linear forwards;
  border: 0.0625rem var(--color-white) solid;
  clip-path: polygon(50% 50%, 50% 50%, 50% 50%, 50% 50%, 50% 50%, 50% 50%);
}

.box1 {
  top: 0;
  left: 0;
  height: 100%;
  width: 13.75rem;
}

.box2 {
  top: 0;
  right: 0;
  width: 8.5rem;
  height: 8.5rem;
  animation-delay: 0.5s;
  transform: rotate(90deg);
}

.box3 {
  right: 0;
  bottom: 0;
  width: 5.25rem;
  height: 5.25rem;
  animation-delay: 1s;
}

.box4 {
  bottom: 0;
  right: 5.25rem;
  width: 3.25rem;
  height: 3.25rem;
  animation-delay: 1.5s;
  transform: rotate(-90deg);
}

.box5 {
  width: 2rem;
  height: 2rem;
  right: 6.5rem;
  bottom: 3.25rem;
  animation-delay: 2s;
  transform: rotate(-90deg);
}

.box6 {
  bottom: 4rem;
  right: 5.25rem;
  width: 1.25rem;
  height: 1.25rem;
  animation-delay: 2.5s;
}

.box7 {
  right: 5.25rem;
  width: 0.75rem;
  height: 0.75rem;
  bottom: 3.25rem;
  animation-delay: 3s;
  transform: rotate(-90deg);
}

.box8 {
  right: 6rem;
  width: 0.5rem;
  height: 0.5rem;
  bottom: 3.25rem;
  animation-delay: 3.5s;
  transform: rotate(-90deg);
}

.box9 {
  right: 6.25rem;
  width: 0.25rem;
  height: 0.25rem;
  bottom: 3.75rem;
  animation-delay: 4s;
  transform: rotate(90deg);
}

.box10 {
  right: 6rem;
  width: 0.25rem;
  height: 0.25rem;
  bottom: 3.75rem;
  animation-delay: 4.5s;
  transform: rotate(-90deg);
}

.curve {
  z-index: 2;
  border-radius: 50%;
  position: absolute;
  visibility: hidden;
  animation: top-left-curve 2s linear forwards;
  border: 0.1rem var(--color-gold) solid;
  clip-path: polygon(50% 50%, 50% 50%, 50% 50%, 50% 50%);
}

.curve1 {
  top: 0;
  left: 0;
  width: 27.5rem;
  height: 27.5rem;
  animation-delay: 20.8s;
  animation-duration: 3s;
}

.curve2 {
  top: 0;
  right: 0;
  width: 17rem;
  height: 17rem;
  animation-delay: 19.8s;
  transform: rotate(90deg);
}

.curve3 {
  right: 0;
  bottom: 0;
  width: 10.5rem;
  height: 10.5rem;
  animation-delay: 18.5s;
  transform: rotate(180deg);
}

.curve4 {
  bottom: 0;
  right: 2rem;
  width: 6.5rem;
  height: 6.5rem;
  animation-delay: 17.15s;
  transform: rotate(270deg);
}

.curve5 {
  width: 4rem;
  height: 4rem;
  right: 4.5rem;
  bottom: 1.25rem;
  animation-delay: 15.8s;
}

.curve6 {
  width: 2.5rem;
  right: 5.25rem;
  height: 2.5rem;
  bottom: 2.75rem;
  animation-delay: 14.45s;
  transform: rotate(90deg);
}

.curve7 {
  width: 1.5rem;
  right: 5.25rem;
  height: 1.5rem;
  bottom: 3.25rem;
  animation-delay: 13.1s;
  transform: rotate(180deg);
}

.curve8 {
  width: 1rem;
  height: 1rem;
  right: 5.5rem;
  bottom: 3.25rem;
  animation-delay: 11.75s;
  transform: rotate(270deg);
}

.curve9 {
  right: 6rem;
  width: 0.5rem;
  height: 0.5rem;
  bottom: 3.5rem;
  animation-delay: 10.35s;
}

.curve10 {
  right: 6rem;
  width: 0.5rem;
  height: 0.5rem;
  bottom: 3.5rem;
  animation-delay: 9s;
  transform: rotate(90deg);
}

@keyframes reveal-border {
  0% {
    border: 0.0625rem transparent solid;
  }
  100% {
    border: 0.0625rem var(--color-gray) solid;
  }
}

@keyframes top-left-curve {
  0%,
  100% {
    visibility: visible;
  }
  33.33% {
    clip-path: polygon(50% 50%, 50% 0%, 50% 0%, 50% 0%);
  }
  66.67% {
    clip-path: polygon(50% 50%, 50% 0%, 0% 0%, 0% 0%);
  }
  100% {
    clip-path: polygon(50% 50%, 50% 0%, 0% 0%, 0% 50%);
  }
}

@keyframes up-movement {
  0%,
  100% {
    visibility: visible;
  }
  20% {
    clip-path: polygon(50% 50%, 0% 100%, 0% 100%, 0% 100%, 0% 100%, 0% 100%);
  }
  40% {
    clip-path: polygon(50% 50%, 0% 100%, 0% 0%, 0% 0%, 0% 0%, 0% 0%);
  }
  60% {
    clip-path: polygon(50% 50%, 0% 100%, 0% 0%, 100% 0%, 100% 0%, 100% 0%);
  }
  80% {
    clip-path: polygon(50% 50%, 0% 100%, 0% 0%, 100% 0%, 100% 100%, 100% 100%);
  }
  100% {
    border: 0.0625rem var(--color-gray) solid;
    clip-path: polygon(50% 50%, 0% 100%, 0% 0%, 100% 0%, 100% 100%, 0% 100%);
  }
}

@media screen and (max-width: 400px), screen and (max-height: 400px) {
  html {
    font-size: max(calc(16 * min(100vw / 450, 100vh / 300)), 0px);
  }
}

@media screen and (min-width: 700px) and (min-height: 500px) {
  .fibonacci {
    scale: 1.5;
  }
}

@media screen and (min-width: 1000px) and (min-height: 600px) {
  .fibonacci {
    scale: 2;
  }
}

@media screen and (min-width: 1000px) and (min-height: 700px) {
  .fibonacci {
    scale: 2.5;
  }
}

@media screen and (min-width: 1000px) and (min-height: 1000px) {
  .fibonacci {
    scale: 3.5;
  }
}

@media screen and (min-width: 1000px) and (max-width: 1400px) and (min-height: 1000px) {
  html {
    font-size: max(100vw / 100, 0px);
  }
}