.anchor-btn a span{
  display: inline-block;
  position: relative;
  overflow: hidden;
  animation: ctaPulseV2 3s ease-in-out infinite;
  border-radius: 100px;
}

/* 光の帯（疑似要素） */
.anchor-btn a span::before {
  content: "";
  position: absolute;
  top: 0;
  left: -75%;
  width: 50%;
  height: 100%;
  background: linear-gradient(100deg,
      rgba(255, 255, 255, 0) 0%,
      rgba(255, 255, 255, 0.6) 50%,
      rgba(255, 255, 255, 0) 100%);
  transform: skewX(-20deg);
  animation: ctaShine 3s ease-in-out infinite;
  pointer-events: none;
}

/* 拍動(3秒周期) */
@keyframes ctaPulseV2 {

  0%,
  20% {
    transform: scale(1);
  }

  5% {
    transform: scale(0.975);
  }

  10% {
    transform: scale(1);
  }

  15% {
    transform: scale(0.95);
  }
}

/* 光の帯(3秒周期、拍動終了直後に走る) */
@keyframes ctaShine {

  0%,
  18% {
    left: -75%;
    opacity: 0;
  }

  20% {
    opacity: 1;
  }

  35% {
    left: 125%;
    opacity: 1;
  }

  36%,
  100% {
    left: 125%;
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .anchor-btn a span{
    animation: none;
  }

  .anchor-btn a span::before {
    animation: none;
    display: none;
  }
}

header#header div.site-title a {
  background: url(../img/site-title.svg) no-repeat 0 0;
}