:root {
  --bg-color: #180326;
  --primary-color: #c000ff;
  --secondary-color: #9000f0;
  --snake: #01ffc3;
  --apple: #ff073a;
}

html {
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

body {
  margin: 0;
  padding: 3em 1em;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: 'Press Start 2P', cursive;
  background: var(--bg-color);
  color: var(--primary-color);
}

h1 {
  font-weight: 400;
  font-size: 4rem;
  font-family: 'Monoton', cursive;
  margin-bottom: 3rem;
}

.btn {
  color: var(--primary-color);
  border: 0;
  background: transparent;
  font-family: inherit;
  position: relative;
  display: block;
  text-decoration: none;
  padding: 1em 2em;
  text-transform: uppercase;
  overflow: hidden;
  transition: 0.2s;
  cursor: pointer;
  margin-bottom: 2em;
  font-size: 1.1rem;
}

.btn:hover {
  color: var(--secondary-color);
  background: var(--primary-color);
  box-shadow: 0 0 20px var(--primary-color), 0 0 80px var(--primary-color),
    0 0 160px var(--primary-color), 0 0 320px var(--primary-color);
  transition-delay: 0.5s;
}

.glow-border {
  position: absolute;
  display: block;
}

.glow-border:nth-child(1) {
  top: 0;
  transform: translateX(-115%);
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--primary-color));
}

.btn:hover .glow-border:nth-child(1) {
  transform: translateX(100%);
  transition: 0.5s;
}

.glow-border:nth-child(3) {
  bottom: 0;
  transform: translateX(100%);
  width: 100%;
  height: 4px;
  background: linear-gradient(270deg, transparent, var(--primary-color));
}

.btn:hover .glow-border:nth-child(3) {
  transform: translateX(-115%);
  transition: 0.5s 0.25s;
}

.glow-border:nth-child(2) {
  right: 0;
  transform: translateY(-140%);
  height: 100%;
  width: 4px;
  background: linear-gradient(180deg, transparent, var(--primary-color));
}

.btn:hover .glow-border:nth-child(2) {
  transform: translateY(100%);
  transition: 0.5s 0.125s;
}

.glow-border:nth-child(4) {
  left: 0;
  transform: translateY(130%);
  height: 100%;
  width: 4px;
  background: linear-gradient(0deg, transparent, var(--primary-color));
}

.btn:hover .glow-border:nth-child(4) {
  transform: translateY(-100%);
  transition: 0.5s 0.375s;
}

.glow-animation:nth-child(1) {
  animation: animateTop 2s infinite backwards;
}

.glow-animation:nth-child(3) {
  animation: animateBottom 2s infinite backwards 1s;
}

.glow-animation:nth-child(2) {
  animation: animateRight 2s infinite backwards 0.5s;
}

.glow-animation:nth-child(4) {
  animation: animateLeft 2s infinite backwards 1.5s;
}

@keyframes animateTop {
  0% {
    transform: translateX(-115%);
  }
  100% {
    transform: translateX(100%);
  }
}
@keyframes animateBottom {
  0% {
    transform: translateX(100%);
  }
  100% {
    transform: translateX(-115%);
  }
}
@keyframes animateRight {
  0% {
    transform: translateY(-140%);
  }
  100% {
    transform: translateY(100%);
  }
}
@keyframes animateLeft {
  0% {
    transform: translateY(100%);
  }
  100% {
    transform: translateY(-140%);
  }
}

.grid-container {
  position: relative;
  overflow: hidden;
  padding: 4px;
  outline: 1px solid var(--primary-color);
  outline-offset: 1px;
}

.grid {
  /* The grid is 16x16 divs*/
  width: 402px;
  height: 402px;
  border: 1px solid var(--primary-color);
  display: flex;
  flex-wrap: wrap;
}

.square {
  /* Each square in the grid is 20px x 20px */
  width: 20px;
  height: 20px;
  /* border: 1px solid #777; */
}

.snake {
  background: var(--snake);
  box-shadow: 0 0 1px var(--snake), 0 0 2px var(--snake), 0 0 4px var(--snake),
    0 0 6px var(--snake);
}

.apple {
  background: var(--apple);
  box-shadow: 0 0 2px var(--apple), 0 0 8px var(--apple), 0 0 16px var(--apple),
    0 0 32px var(--apple);
}

@keyframes text-flicker-in-glow {
  0% {
    opacity: 0;
  }
  10% {
    opacity: 0;
    text-shadow: none;
  }
  10.1% {
    opacity: 1;
    text-shadow: none;
  }
  10.2% {
    opacity: 0;
    text-shadow: none;
  }
  20% {
    opacity: 0;
    text-shadow: none;
  }
  20.1% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.25);
  }
  20.6% {
    opacity: 0;
    text-shadow: none;
  }
  30% {
    opacity: 0;
    text-shadow: none;
  }
  30.1% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.45),
      0 0 60px rgba(255, 255, 255, 0.25);
  }
  30.5% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.45),
      0 0 60px rgba(255, 255, 255, 0.25);
  }
  30.6% {
    opacity: 0;
    text-shadow: none;
  }
  45% {
    opacity: 0;
    text-shadow: none;
  }
  45.1% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.45),
      0 0 60px rgba(255, 255, 255, 0.25);
  }
  50% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.45),
      0 0 60px rgba(255, 255, 255, 0.25);
  }
  55% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.45),
      0 0 60px rgba(255, 255, 255, 0.25);
  }
  55.1% {
    opacity: 0;
    text-shadow: none;
  }
  57% {
    opacity: 0;
    text-shadow: none;
  }
  57.1% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.55),
      0 0 60px rgba(255, 255, 255, 0.35);
  }
  60% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.55),
      0 0 60px rgba(255, 255, 255, 0.35);
  }
  60.1% {
    opacity: 0;
    text-shadow: none;
  }
  65% {
    opacity: 0;
    text-shadow: none;
  }
  65.1% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.55),
      0 0 60px rgba(255, 255, 255, 0.35), 0 0 100px rgba(255, 255, 255, 0.1);
  }
  75% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.55),
      0 0 60px rgba(255, 255, 255, 0.35), 0 0 100px rgba(255, 255, 255, 0.1);
  }
  75.1% {
    opacity: 0;
    text-shadow: none;
  }
  77% {
    opacity: 0;
    text-shadow: none;
  }
  77.1% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.55),
      0 0 60px rgba(255, 255, 255, 0.4), 0 0 110px rgba(255, 255, 255, 0.2),
      0 0 100px rgba(255, 255, 255, 0.1);
  }
  85% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.55),
      0 0 60px rgba(255, 255, 255, 0.4), 0 0 110px rgba(255, 255, 255, 0.2),
      0 0 100px rgba(255, 255, 255, 0.1);
  }
  85.1% {
    opacity: 0;
    text-shadow: none;
  }
  86% {
    opacity: 0;
    text-shadow: none;
  }
  86.1% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.6),
      0 0 60px rgba(255, 255, 255, 0.45), 0 0 110px rgba(255, 255, 255, 0.25),
      0 0 100px rgba(255, 255, 255, 0.1);
  }
  100% {
    opacity: 1;
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.6),
      0 0 60px rgba(255, 255, 255, 0.45), 0 0 110px rgba(255, 255, 255, 0.25),
      0 0 100px rgba(255, 255, 255, 0.1);
  }
}