:root {
  color-scheme: light;
  background: #fff;
  --mark-filter: none;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #fff;
}

main {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 100svh;
  padding: clamp(1.5rem, 5vw, 4rem);
}

.mark {
  width: min(37vmin, 21rem);
  aspect-ratio: 1;
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
}

.mark__breath {
  position: relative;
  width: 100%;
  height: 100%;
  transform-origin: 50% 52%;
}

.mark__layer,
.mark__fallback {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.mark__fallback {
  -webkit-user-drag: none;
}

.mark__layer,
.mark__fallback {
  filter: var(--mark-filter);
  mix-blend-mode: multiply;
}

.mark__core {
  opacity: 0;
}

.js .mark__fallback {
  opacity: 0;
}

.mark.is-settled .mark__breath {
  animation: breathe 10.5s ease-in-out infinite;
}

@keyframes breathe {
  0%,
  100% {
    transform: scale(0.997) rotate(-0.08deg);
  }

  50% {
    transform: scale(1.006) rotate(0.12deg);
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    background: #000;
    --mark-filter: invert(1);
  }

  body {
    background: #000;
  }

  .mark__layer,
  .mark__fallback {
    mix-blend-mode: screen;
  }
}

@media (prefers-reduced-motion: reduce) {
  .mark.is-settled .mark__breath {
    animation: none;
  }
}