04Text label on hover

<main class="stage">
  <div class="card"></div>
  <span class="label is-demo" aria-hidden="true">View</span>
</main>

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

$duration: $dur-loop;                                 // 라벨이 카드 위를 도는 한 바퀴
$easing: $ease-spring;
$color: $subject-blue;                                 // 라벨 배경색

@include stage($stage-paper);

.stage { position: relative; overflow: hidden; cursor: none; }

.card {
  width: clamp(140px, 42vw, 220px);
  height: clamp(90px, 28vw, 140px);
  border-radius: $r-card;
  background: $subject-ink;
}

.label {
  position: absolute;
  top: 0;
  left: 0;
  padding: clamp(5px, 1.6vw, 7px) clamp(10px, 3vw, 14px);
  border-radius: $r-pill;
  background: $color;
  color: #fff;
  font-weight: 700; font-size: clamp(11px, 3vw, 13px); line-height: 1; font-family: inherit;
  opacity: 0;
  transition: opacity 140ms $easing;
  pointer-events: none;
  transform: translate(-50%, -140%);

  &.is-demo {
    animation: label-path $duration $easing infinite,
               label-fade $duration $easing infinite;
  }
}

@keyframes label-path {
  0%   { transform: translate(calc(-50% + 70px), calc(-140% + 40px)); }
  40%  { transform: translate(calc(-50% + 150px), calc(-140% + 90px)); }
  60%  { transform: translate(calc(-50% + 150px), calc(-140% + 90px)); }
  100% { transform: translate(calc(-50% + 70px), calc(-140% + 40px)); }
}

@keyframes label-fade {
  0%, 100% { opacity: 0; }
  30%, 65% { opacity: 1; }
}

@media (pointer: coarse) {
  .label { display: none; }
  .stage { cursor: auto; }
}

@media (prefers-reduced-motion: reduce) {
  .label.is-demo { animation: none; opacity: 0; }
}

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);
}

.stage {
  position: relative;
  overflow: hidden;
  cursor: none;
}

.card {
  width: clamp(140px, 42vw, 220px);
  height: clamp(90px, 28vw, 140px);
  border-radius: 16px;
  background: #17141a;
}

.label {
  position: absolute;
  top: 0;
  left: 0;
  padding: clamp(5px, 1.6vw, 7px) clamp(10px, 3vw, 14px);
  border-radius: 999px;
  background: #2f6df6;
  color: #fff;
  font-weight: 700;
  font-size: clamp(11px, 3vw, 13px);
  line-height: 1;
  font-family: inherit;
  opacity: 0;
  transition: opacity 140ms cubic-bezier(0.2, 0.8, 0.2, 1);
  pointer-events: none;
  transform: translate(-50%, -140%);
}
.label.is-demo {
  animation: label-path 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite, label-fade 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes label-path {
  0% {
    transform: translate(calc(-50% + 70px), calc(-140% + 40px));
  }
  40% {
    transform: translate(calc(-50% + 150px), calc(-140% + 90px));
  }
  60% {
    transform: translate(calc(-50% + 150px), calc(-140% + 90px));
  }
  100% {
    transform: translate(calc(-50% + 70px), calc(-140% + 40px));
  }
}
@keyframes label-fade {
  0%, 100% {
    opacity: 0;
  }
  30%, 65% {
    opacity: 1;
  }
}
@media (pointer: coarse) {
  .label {
    display: none;
  }
  .stage {
    cursor: auto;
  }
}
@media (prefers-reduced-motion: reduce) {
  .label.is-demo {
    animation: none;
    opacity: 0;
  }
}

// 카드 위에서만 라벨이 보이고, 실제 포인터 좌표를 그대로 따라간다.
if (matchMedia('(pointer: fine)').matches) {
  var stage = document.querySelector('.stage'), card = document.querySelector('.card'), label = document.querySelector('.label');
  stage.addEventListener('pointermove', function (e) {
    label.classList.remove('is-demo');
    var r = stage.getBoundingClientRect();
    label.style.transform = 'translate(' + (e.clientX - r.left) + 'px,' + (e.clientY - r.top) + 'px)';
    label.style.opacity = card.contains(e.target) ? 1 : 0;
  });
}

import { useRef, useState } from "react";
import type { CSSProperties, PointerEvent } from "react";
import styles from "./CursorTextLabel.module.scss";

export type CursorTextLabelProps = {
  label?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };

export default function CursorTextLabel({
  label = "보기",
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: CursorTextLabelProps) {
  const cardRef = useRef<HTMLDivElement>(null);
  const [demo, setDemo] = useState(true);
  const [pos, setPos] = useState({ x: 0, y: 0, on: false });

  const move = (e: PointerEvent<HTMLDivElement>) => {
    const r = e.currentTarget.getBoundingClientRect();
    setDemo(false);
    const on = cardRef.current!.contains(e.target as Node);
    setPos({ x: e.clientX - r.left, y: e.clientY - r.top, on });
  };

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <div className={styles.stage} style={vars} onPointerMove={move}>
      <div ref={cardRef} className={styles.card} />
      <span
        className={demo ? `${styles.label} ${styles.isDemo}` : styles.label}
        style={demo ? undefined : { transform: `translate(${pos.x}px,${pos.y}px)`, opacity: pos.on ? 1 : 0 }}
        aria-hidden="true"
      >
        {label}
      </span>
    </div>
  );
}