.fx-wt {
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

.fx-wt__stage {
  position: absolute;
  inset: 0;
  pointer-events: none;
  user-select: none;
  perspective: var(--fx-wt-perspective, 900px);
  perspective-origin: 50% 50%;
}

.fx-wt__space {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
}

.fx-wt__word {
  position: absolute;
  top: 50%;
  left: 50%;
  color: var(--fx-wt-color, #fff);
  font-size: var(--fx-wt-font-size, 24px);
  line-height: 1;
  white-space: nowrap;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  will-change: transform, opacity;
  animation-name: var(--fx-wt-anim, fx-wt-converge);
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

.fx-wt__content {
  position: relative;
  z-index: 1;
  height: 100%;
}

/* 默认 keyframes；自定义 fadeIn/fadeOut 时由组件注入覆盖名 */
@keyframes fx-wt-converge {
  0% {
    opacity: 0;
    transform: translate3d(
      calc(-50% + var(--fx-wt-x)),
      calc(-50% + var(--fx-wt-y)),
      var(--fx-wt-z0)
    );
  }

  10% {
    opacity: var(--fx-wt-op);
  }

  88% {
    opacity: calc(var(--fx-wt-op) * 0.7);
  }

  100% {
    opacity: 0;
    transform: translate3d(
      calc(-50% + var(--fx-wt-x)),
      calc(-50% + var(--fx-wt-y)),
      var(--fx-wt-z1)
    );
  }
}