YGChatCS/pages/loading/styles/loading.scss

@property --a {
  syntax: "<angle>";
  inherits: true;
  initial-value: 0deg;
}

@property --l {
  syntax: "<number>";
  inherits: true;
  initial-value: 0;
}
@property --x {
  syntax: "<length>";
  inherits: false;
  initial-value: 0;
}
@property --y {
  syntax: "<length>";
  inherits: false;
  initial-value: 0;
}

@property --o {
  syntax: "<number>";
  inherits: false;
  initial-value: 0;
}

.ai {
  --s: 32px;
  // --p: calc(var(--s) / 4);
  width: var(--s);
  aspect-ratio: 1;
  --bg-color: color-mix(in srgb, #7b7bf4, transparent 90%);
  background: radial-gradient(
      60% 75% at center,
      var(--bg-color) 50%,
      transparent 50%
    ),
    radial-gradient(75% 60% at center, var(--bg-color) 50%, transparent 50%);
  padding: var(--p);
  margin-right: 8px;
  display: grid;
  place-items: center;
  position: relative;
  border-radius: 50%;
  transform: scale(1.0);
}

$count: 4;
:root {
  --count: #{$count};
  --radius: 6vmin;
}

@keyframes ai {
  from {
    --a: 360deg;
    --l: 0.35;
    --o: 1;
  }

  30% {
    --l: 1.5;
  }

  70% {
    --o: 0.4;
    --l: 0.05;
  }

  98% {
    --o: 0.7;
  }

  to {
    --a: 0deg;
    --l: 0.35;
    --o: 1;
  }
}

.c {
  opacity: 0.9;
  position: absolute;
  width: 10vmin;
  aspect-ratio: 1;
  border-radius: 50%;
  --offset-per-item: calc(360deg / var(--count));
  --current-angle-offset: calc(var(--offset-per-item) * var(--i) + var(--a));
  translate: calc(
      cos(var(--current-angle-offset)) * var(--radius) + var(--x, 0)
    )
    calc(sin(var(--current-angle-offset)) * var(--radius) * -1);
  scale: calc(0.6 + var(--l));
  animation: ai 5.5s cubic-bezier(0.45, -0.35, 0.16, 1.5) infinite;
  transition: opacity 0.3s linear;
  opacity: var(--o, 1);
  @for $i from 0 through $count {
    &:nth-child(#{$i + 1}) {
      --i: #{$i};
    }
  }
}

.c1 {
  background: #79e3ee;
  background: radial-gradient(50% 50% at center, #79e3ee, #e7e7fb);
  background: radial-gradient(50% 50% at center, #c979ee, #74bcd6);

  --x: 1vmin;
  width: 16vmin;
  animation-timing-function: cubic-bezier(0.12, 0.32, 0.68, 0.24);
}

.c2 {
  background: radial-gradient(50% 50% at center, #ef788c, #e7e7fb);
  width: 15vmin;
}

.c3 {
  background: radial-gradient(50% 50% at center, #eb7fc6, transparent);
  width: 5vmin;
  opacity: 0.6;
  --x: -1vmin;
}

.c4 {
  background: #6d67c8;
  animation-timing-function: cubic-bezier(0.39, -0.03, 0.75, 0.47);
}

.container {
  overflow: hidden;
  background: #b6a9f8;
  width: 100%;
  border-radius: 50%;
  aspect-ratio: 1;
  position: relative;
  display: grid;
  place-items: center;
}

.glass {
  overflow: hidden;
  position: absolute;
  --w: 0.5vmin;
  inset: calc(var(--s) - var(--s));
  border-radius: 50%;
  backdrop-filter: blur(1.3vmin);
  box-shadow: 0 0 8vmin color-mix(in srgb, black, transparent 70%);
  background: radial-gradient(
    10vmin at 70% 30%,
    rgba(255, 255, 255, 0.2),
    transparent
  );

  // // lines
  // &:after {
  //   content: "";
  //   position: absolute;
  //   inset: 0;
  //   --c: rgba(255, 255, 255, 0.03);
  //   --w: 0.0625rem;
  //   --g: 0.1875rem;

  //   background: repeating-linear-gradient(
  //     var(--c),
  //     var(--c),
  //     var(--w),
  //     transparent var(--w),
  //     transparent calc(var(--w) + var(--g))
  //   );
  //   border-radius: inherit;
  //   border: 1vmin rgba(255, 255, 255, 0.1) solid;
  // }
}

@property --value {
  syntax: "<angle>";
  inherits: true;
  initial-value: 0deg;
}

@property --width-ratio {
  syntax: "<number>";
  inherits: true;
  initial-value: 0;
}

@property --scale {
  syntax: "<number>";
  inherits: true;
  initial-value: 0;
}

:root {
  --width: 1vmin;
  --duration: 8s;
}

.rings {
  aspect-ratio: 1;
  border-radius: 50%;
  position: absolute;
  inset: 0;
  perspective: 11rem;
  opacity: .9;

  &:before,
  &:after {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(255, 0, 0, 1);
    border-radius: 50%;
    --width-ratio: 1;
    border: calc(var(--width) * var(--width-ratio)) solid transparent;
    mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    background: linear-gradient(
      white,
      blue,
      magenta,
      violet,
      lightyellow) border-box;
    mask-composite: exclude;
    animation: ring var(--duration) ease-in-out infinite;
    --start: 180deg;
    --value: var(--start);
    --scale: 1;
    transform: rotateY(var(--value)) rotateX(var(--value)) rotateZ(var(--value))
      scale(var(--scale));
  }

  &:before {
    --start: 180deg;
  }

  &:after {
    --start: 90deg;
  }

  > .rings {
    &:before {
      --start: 360deg;
    }

    &:after {
      --start: 270deg;
    }
  }
}

@keyframes ring {
  from {
    --value: var(--start);
    --scale: 1;
  }
  50% {
    --scale: 1.2;
    --width-ratio: 1.5;
  }
  70% {
    --scale: 1;
    --value: calc(var(--start) + 180deg);
    --width-ratio: 1;
  }

  80% {
    --scale: 1.2;
    --width-ratio: 1.5;
  }

  to {
    --value: calc(var(--start) + 360deg);
    --scale: 1;
    --width-ratio: 1;
  }
}