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

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

.link {
  color: #17141a;
  text-decoration-line: underline;
  text-decoration-style: solid;
  text-decoration-color: #2f6df6;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  font-weight: 700;
  font-size: clamp(18px, 5vw, 26px);
  line-height: 1.4;
  transition: text-decoration-thickness 300ms ease-out, text-underline-offset 300ms ease-out;
}

.link:hover, .link:focus-visible {
  text-decoration-thickness: 4px;
  text-underline-offset: 5px;
}

.link.is-demo {
  animation: underline-thick 2s ease-out infinite;
}

@keyframes underline-thick {
  0%, 100% {
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
  }
  35%, 60% {
    text-decoration-thickness: 4px;
    text-underline-offset: 5px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .link, .link.is-demo {
    transition: none;
    animation: none;
  }
  .link:hover, .link:focus-visible {
    text-decoration-thickness: 4px;
    text-underline-offset: 5px;
  }
}