@import url('https://fonts.googleapis.com/css2?family=Fredoka+One&display=swap');

.demo {
  --stripe-step: .75vmax;
  --stripe-tiny-step: .5vmax;
  --stripe-offset: calc(var(--stripe-step) * .7);
  --stripe-offset-neg: calc(var(--stripe-offset) * -1);
  --delay: 2.5s;
  --duration: calc(var(--delay) * 3);
  
  position: relative;
  width: 100%;
  height: 1em;
  font-family: 'Fredoka One', cursive;
  line-height: 1;
  text-align: center;
  
  &__text,
  &::before,
  &::after {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    mask-image: repeating-linear-gradient(-45deg,
      black 0, black var(--stripe-step),
      transparent 0, transparent calc(var(--stripe-step) * 3)
    );
    mask-position: 0 0;
    mask-size: 120% 120%;
    animation: mask-move var(--duration) ease-out infinite;
  }
  
  &__text {
    left: 0;
    top: 0;
    color: gold;
  }
  
  &::before,
  &::after {
    content: attr(data-text);
  }
  
  &::before {
    left: var(--stripe-offset);
    bottom: var(--stripe-offset);
    mask-position: var(--stripe-offset) var(--stripe-offset);
    animation-delay: calc(var(--delay) * -1);
    color: tomato;
  }
  &::after {
    left: var(--stripe-offset-neg);
    bottom: var(--stripe-offset-neg);
    mask-position: var(--stripe-offset-neg) var(--stripe-offset-neg);
    animation-delay: calc(var(--delay) * -2);
    color: turquoise;
  }
}

@keyframes mask-move {
  0% {
    mask-position: 0 0;
  }
  33% {
    mask-position: var(--stripe-offset) var(--stripe-offset);
  }
  66% {
    mask-position: var(--stripe-offset-neg) var(--stripe-offset-neg);
  }
  100% {
    mask-position: 0 0;
  }
}

// Helpers
BODY {
  background: #000;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(40px, 25vw, 250px);
}