opencode/packages/ui/src/components/text-shimmer.css

[data-component="text-shimmer"] {
  --text-shimmer-step: 45ms;
  --text-shimmer-duration: 1200ms;
  --text-shimmer-swap: 220ms;
  --text-shimmer-index: 0;
  --text-shimmer-angle: 90deg;
  --text-shimmer-spread: 5.2ch;
  --text-shimmer-size: 360%;
  --text-shimmer-base-color: var(--text-weak);
  --text-shimmer-peak-color: var(--text-strong);
  --text-shimmer-sweep: linear-gradient(
    var(--text-shimmer-angle),
    transparent calc(50% - var(--text-shimmer-spread)),
    var(--text-shimmer-peak-color) 50%,
    transparent calc(50% + var(--text-shimmer-spread))
  );
  --text-shimmer-base: linear-gradient(var(--text-shimmer-base-color), var(--text-shimmer-base-color));

  display: inline-flex;
  align-items: baseline;
  font: inherit;
  letter-spacing: inherit;
  line-height: inherit;
}

[data-component="text-shimmer"] [data-slot="text-shimmer-char"] {
  display: inline-grid;
  white-space: pre;
  font: inherit;
  letter-spacing: inherit;
  line-height: inherit;
}

[data-component="text-shimmer"] [data-slot="text-shimmer-char-base"],
[data-component="text-shimmer"] [data-slot="text-shimmer-char-shimmer"] {
  grid-area: 1 / 1;
  white-space: pre;
  transition: opacity var(--text-shimmer-swap) ease-out;
  font: inherit;
  letter-spacing: inherit;
  line-height: inherit;
}

[data-component="text-shimmer"] [data-slot="text-shimmer-char-base"] {
  color: inherit;
  opacity: 1;
}

[data-component="text-shimmer"] [data-slot="text-shimmer-char-shimmer"] {
  color: var(--text-weaker);
  opacity: 0;
}

[data-component="text-shimmer"][data-active="true"] [data-slot="text-shimmer-char-shimmer"] {
  opacity: 1;
}

[data-component="text-shimmer"] [data-slot="text-shimmer-char-shimmer"][data-run="true"] {
  animation-name: text-shimmer-sweep;
  animation-duration: var(--text-shimmer-duration);
  animation-iteration-count: infinite;
  animation-timing-function: linear;
  animation-fill-mode: both;
  animation-delay: calc(var(--text-shimmer-step) * var(--text-shimmer-index) * -1);
  will-change: background-position;
}

@keyframes text-shimmer-sweep {
  0% {
    background-position:
      100% 0,
      0 0;
  }

  100% {
    background-position:
      0% 0,
      0 0;
  }
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  [data-component="text-shimmer"] [data-slot="text-shimmer-char-shimmer"] {
    color: transparent;
    -webkit-text-fill-color: transparent;
    background-image: var(--text-shimmer-sweep), var(--text-shimmer-base);
    background-size:
      var(--text-shimmer-size) 100%,
      100% 100%;
    background-position:
      100% 0,
      0 0;
    background-repeat: no-repeat;
    -webkit-background-clip: text;
    background-clip: text;
  }

  [data-component="text-shimmer"][data-active="true"] [data-slot="text-shimmer-char-base"] {
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  [data-component="text-shimmer"] [data-slot="text-shimmer-char-base"],
  [data-component="text-shimmer"] [data-slot="text-shimmer-char-shimmer"] {
    transition-duration: 0ms;
  }

  [data-component="text-shimmer"] [data-slot="text-shimmer-char-shimmer"] {
    animation: none !important;
    color: inherit;
    -webkit-text-fill-color: currentColor;
    background-image: none;
  }

  [data-component="text-shimmer"] [data-slot="text-shimmer-char-base"] {
    opacity: 1 !important;
  }
}