html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.er-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #fff7e6;
  text-decoration: none;
  font: 600 16px/1 -apple-system, "Segoe UI", sans-serif;
}

.er-link__arrow {
  position: relative;
  display: inline-block;
  width: 12px;
  height: 12px;
}

.er-link__shape {
  position: absolute;
  inset: 0;
  border-top: 2px solid #fff7e6;
  border-right: 2px solid #fff7e6;
  transform: rotate(0deg) translate(0, 0);
  transition: transform 260ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

.er-link__trail {
  position: absolute;
  inset: 0;
  border-top: 2px solid #fff7e6;
  border-right: 2px solid #fff7e6;
  opacity: 0;
}

.er-link:hover .er-link__shape {
  transform: rotate(45deg) translate(2px, -2px);
}

@keyframes er-trail-hover {
  0% {
    opacity: 0;
    transform: rotate(0deg) translate(0, 0) scale(0.7);
  }
  45% {
    opacity: 0.4;
    transform: rotate(30deg) translate(1px, -1px) scale(1);
  }
  100% {
    opacity: 0;
    transform: rotate(45deg) translate(2px, -2px) scale(0.5);
  }
}
.er-link:hover .er-link__trail {
  animation: er-trail-hover 300ms ease-out forwards;
}

@keyframes er-rotate {
  0%, 20% {
    transform: rotate(0deg) translate(0, 0);
  }
  50%, 70% {
    transform: rotate(45deg) translate(2px, -2px);
  }
  100% {
    transform: rotate(0deg) translate(0, 0);
  }
}
@keyframes er-trail-loop {
  0%, 20% {
    opacity: 0;
    transform: rotate(0deg) translate(0, 0) scale(0.7);
  }
  40% {
    opacity: 0.4;
    transform: rotate(30deg) translate(1px, -1px) scale(1);
  }
  50%, 70% {
    opacity: 0;
    transform: rotate(45deg) translate(2px, -2px) scale(0.5);
  }
  100% {
    opacity: 0;
    transform: rotate(0deg) translate(0, 0) scale(0.7);
  }
}
.er-link.is-demo .er-link__shape {
  animation: er-rotate 2s cubic-bezier(0.34, 1.56, 0.64, 1) infinite;
}

.er-link.is-demo .er-link__trail {
  animation: er-trail-loop 2s ease-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .er-link:hover .er-link__shape,
  .er-link.is-demo .er-link__shape {
    animation: none !important;
    transition: none !important;
    transform: rotate(0deg) translate(0, 0) !important;
  }
  .er-link__trail,
  .er-link:hover .er-link__trail,
  .er-link.is-demo .er-link__trail {
    animation: none !important;
    opacity: 0 !important;
  }
}