08デフォルトカーソルを隠す

<main class="stage">
  <div class="zone zone--default"><span>デフォルト</span></div>
  <div class="zone zone--custom">
    <span>カスタム</span>
    <div class="cursor is-demo" aria-hidden="true"></div>
  </div>
</main>

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

$duration: $dur-loop;                                 // 점이 오른쪽 영역을 도는 한 바퀴
$easing: $ease-spring;
$color: $subject-blue;                                 // 커스텀 점 색

@include stage($stage-paper);

.stage { display: flex; gap: clamp(6px, 2vw, 10px); padding: clamp(10px, 3vw, 16px); }

.zone {
  position: relative;
  overflow: hidden;
  flex: 1;
  min-height: clamp(80px, 34vw, 220px);
  border-radius: $r-card;
  display: grid;
  place-items: center;
  font-weight: 700; font-size: clamp(12px, 3.4vw, 15px); line-height: 1; font-family: inherit;
}
.zone--default { background: $subject-cream; color: $stage-ink; cursor: auto; }         // 브라우저 기본 화살표
.zone--custom  { background: $stage-ink; color: $subject-cream; cursor: none; }          // cursor: none 이 이 효과의 전제다

.cursor {
  position: absolute;
  top: 0;
  left: 0;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border-radius: 50%;
  background: $color;
  pointer-events: none;

  &.is-demo { animation: cursor-path $duration $easing infinite; }
}

@keyframes cursor-path {
  0%   { transform: translate(30px, 30px); }
  35%  { transform: translate(110px, 90px); }
  70%  { transform: translate(50px, 130px); }
  100% { transform: translate(30px, 30px); }
}

@media (pointer: coarse) {
  .cursor { display: none; }
  .zone--custom { cursor: auto; }
}

@media (prefers-reduced-motion: reduce) {
  .cursor.is-demo { animation: none; transform: translate(30px, 30px); }
}

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 {
  display: flex;
  gap: clamp(6px, 2vw, 10px);
  padding: clamp(10px, 3vw, 16px);
}

.zone {
  position: relative;
  overflow: hidden;
  flex: 1;
  min-height: clamp(80px, 34vw, 220px);
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: clamp(12px, 3.4vw, 15px);
  line-height: 1;
  font-family: inherit;
}

.zone--default {
  background: #fff7e6;
  color: #17141a;
  cursor: auto;
}

.zone--custom {
  background: #17141a;
  color: #fff7e6;
  cursor: none;
}

.cursor {
  position: absolute;
  top: 0;
  left: 0;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border-radius: 50%;
  background: #2f6df6;
  pointer-events: none;
}
.cursor.is-demo {
  animation: cursor-path 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes cursor-path {
  0% {
    transform: translate(30px, 30px);
  }
  35% {
    transform: translate(110px, 90px);
  }
  70% {
    transform: translate(50px, 130px);
  }
  100% {
    transform: translate(30px, 30px);
  }
}
@media (pointer: coarse) {
  .cursor {
    display: none;
  }
  .zone--custom {
    cursor: auto;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cursor.is-demo {
    animation: none;
    transform: translate(30px, 30px);
  }
}

// 오른쪽 영역 안에서만 カスタム 점이 실제 포인터를 따라간다. 왼쪽은 デフォルト 화살표 그대로.
if (matchMedia('(pointer: fine)').matches) {
  var stage = document.querySelector('.stage'), dot = document.querySelector('.cursor'), zone = document.querySelector('.zone--custom');
  stage.addEventListener('pointermove', function (e) {
    var zr = zone.getBoundingClientRect();
    var inside = e.clientX >= zr.left && e.clientX <= zr.right && e.clientY >= zr.top && e.clientY <= zr.bottom;
    dot.style.opacity = inside ? 1 : 0;
    if (inside) { dot.classList.remove('is-demo'); dot.style.transform = 'translate(' + (e.clientX - zr.left) + 'px,' + (e.clientY - zr.top) + 'px)'; }
  });
}

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

export type HideNativeCursorProps = {
  defaultLabel?: string;
  customLabel?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function HideNativeCursor({
  defaultLabel = "기본",
  customLabel = "커스텀",
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: HideNativeCursorProps) {
  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);
    setPos({ x: e.clientX - r.left, y: e.clientY - r.top, on: true });
  };

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

  return (
    <div className={styles.stage} style={vars}>
      <div className={styles.zoneDefault}><span>{defaultLabel}</span></div>
      <div className={styles.zoneCustom} onPointerMove={move} onPointerLeave={() => setPos((p) => ({ ...p, on: false }))}>
        <span>{customLabel}</span>
        <div
          className={demo ? `${styles.cursor} ${styles.isDemo}` : styles.cursor}
          style={demo ? undefined : { transform: `translate(${pos.x}px,${pos.y}px)`, opacity: pos.on ? 1 : 0 }}
          aria-hidden="true"
        />
      </div>
    </div>
  );
}