08Hover highlight marker

<main class="stage">
  <a class="link is-demo" href="#">You might also like this</a>
</main>

@use "../../../../site/static/demo-tokens" as *;

// ── 변수 3개 ─────────────────────────────
$duration: $dur-base;
$easing:   $ease-pop;
$color:    $stage-yellow;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-paper);

.link {
  position: relative;
  isolation: isolate;   // z-index:-1 마커가 무대 배경보다 먼저 그려져 안 보이는 걸 막는다 (046 01·02 실측)
  display: inline-block;
  padding: $sp-1 $sp-2;
  color: $subject-ink;
  text-decoration: none;
  font-weight: 700; font-size: clamp(18px, 5vw, 26px); line-height: 1.3;

  &::before {
    content: "";
    position: absolute;
    inset: 10% -4% 6%;
    background: $color;
    border-radius: $r-xs;
    transform: skewX(-6deg) scaleX(0);
    transform-origin: left center; // 규칙8: 형광펜 마커 왼쪽 채움
    mix-blend-mode: multiply;
    z-index: -1;
    transition: transform $duration $easing;
  }
  &:hover::before, &:focus-visible::before {
    transform: skewX(-6deg) scaleX(1);
  }

  &.is-demo::before {
    animation: marker-hover $dur-loop $easing infinite;
  }
}

@keyframes marker-hover {
  0%, 100%  { transform: skewX(-6deg) scaleX(0); }
  35%, 60%  { transform: skewX(-6deg) scaleX(1); }
}

@media (prefers-reduced-motion: reduce) {
  .link::before, .link.is-demo::before { transition: none; animation: none; }
  .link:hover::before, .link:focus-visible::before { transform: skewX(-6deg) scaleX(1); }
}

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 {
  position: relative;
  isolation: isolate;
  display: inline-block;
  padding: 4px 8px;
  color: #17141a;
  text-decoration: none;
  font-weight: 700;
  font-size: clamp(18px, 5vw, 26px);
  line-height: 1.3;
}
.link::before {
  content: "";
  position: absolute;
  inset: 10% -4% 6%;
  background: #ffd23f;
  border-radius: 4px;
  transform: skewX(-6deg) scaleX(0);
  transform-origin: left center;
  mix-blend-mode: multiply;
  z-index: -1;
  transition: transform 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}
.link:hover::before, .link:focus-visible::before {
  transform: skewX(-6deg) scaleX(1);
}
.link.is-demo::before {
  animation: marker-hover 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes marker-hover {
  0%, 100% {
    transform: skewX(-6deg) scaleX(0);
  }
  35%, 60% {
    transform: skewX(-6deg) scaleX(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .link::before, .link.is-demo::before {
    transition: none;
    animation: none;
  }
  .link:hover::before, .link:focus-visible::before {
    transform: skewX(-6deg) scaleX(1);
  }
}

document.querySelectorAll('.link').forEach(function (b) {
  b.addEventListener('pointerenter', function () { b.classList.remove('is-demo'); });
  b.addEventListener('click', function (e) { e.preventDefault(); });
});

import type { CSSProperties, ReactNode } from "react";
import styles from "./HighlightMarkerHover.module.scss";

export type HighlightMarkerHoverProps = { children: ReactNode; href: string; duration?: number; color?: string; skew?: number };

export default function HighlightMarkerHover({ children, href, duration = 300, color = "#ffd23f", skew = -6 }: HighlightMarkerHoverProps) {
  const vars = { "--duration": `${duration}ms`, "--color": color, "--skew": `${skew}deg` } as CSSProperties;
  return (
    <a className={styles.link} href={href} style={vars}>
      {children}
    </a>
  );
}