08Mouse-shaped scroll hint

<main class="stage">
  <div class="ms-mouse" aria-hidden="true">
    <span class="ms-dot"></span>
    <span class="ms-trail"></span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 1.6s;
$easing: $ease-out;
$color: $subject-ink;

@include stage($stage-paper);

.ms-mouse {
  position: relative;
  box-sizing: border-box;
  width: 44px;
  height: 68px;
  border: 3px solid $color;
  border-radius: $r-pill;
  display: flex;
  justify-content: center;
  padding-top: $sp-3;
}

.ms-dot {
  width: 8px;
  height: 16px;
  border-radius: $r-pill;
  background: $color;
  opacity: 1;
  transform: translateY(0);
}

// 자동 재생: 휠을 나타내는 점이 마우스 테두리 안에서 아래로 흘러내리듯 움직이다 사라지기를 반복한다. 63%에서 오버슛했다 70%에서 정착·소멸한다
@keyframes ms-scroll {
  0%   { opacity: 1; transform: translateY(0); }
  55%  { opacity: 1; transform: translateY(20px); }
  63%  { opacity: .6; transform: translateY(27px); }
  70%  { opacity: 0; transform: translateY(24px); }
  100% { opacity: 0; transform: translateY(24px); }
}
.ms-dot { animation: ms-scroll $duration $easing infinite; }

// 트레일 파티클 — 점 위로 작은 잔상이 더 늦게, 더 흐리게 따라 내려온다
.ms-trail {
  position: absolute;
  top: $sp-3;
  width: 5px;
  height: 5px;
  border-radius: $r-pill;
  background: $color;
  opacity: 0;
}
@keyframes ms-trail-scroll {
  0%        { opacity: 0; transform: translateY(-4px) scale(.6); }
  40%       { opacity: .3; transform: translateY(8px) scale(.8); }
  85%, 100% { opacity: 0; transform: translateY(20px) scale(.4); }
}
.ms-trail { animation: ms-trail-scroll $duration $easing 120ms infinite; }

@media (prefers-reduced-motion: reduce) {
  .ms-dot { animation: none !important; opacity: 1 !important; transform: translateY(0) !important; }
  .ms-trail { animation: none !important; opacity: 0 !important; }
}

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);
}

.ms-mouse {
  position: relative;
  box-sizing: border-box;
  width: 44px;
  height: 68px;
  border: 3px solid #17141a;
  border-radius: 999px;
  display: flex;
  justify-content: center;
  padding-top: 12px;
}

.ms-dot {
  width: 8px;
  height: 16px;
  border-radius: 999px;
  background: #17141a;
  opacity: 1;
  transform: translateY(0);
}

@keyframes ms-scroll {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  55% {
    opacity: 1;
    transform: translateY(20px);
  }
  63% {
    opacity: 0.6;
    transform: translateY(27px);
  }
  70% {
    opacity: 0;
    transform: translateY(24px);
  }
  100% {
    opacity: 0;
    transform: translateY(24px);
  }
}
.ms-dot {
  animation: ms-scroll 1.6s ease-out infinite;
}

.ms-trail {
  position: absolute;
  top: 12px;
  width: 5px;
  height: 5px;
  border-radius: 999px;
  background: #17141a;
  opacity: 0;
}

@keyframes ms-trail-scroll {
  0% {
    opacity: 0;
    transform: translateY(-4px) scale(0.6);
  }
  40% {
    opacity: 0.3;
    transform: translateY(8px) scale(0.8);
  }
  85%, 100% {
    opacity: 0;
    transform: translateY(20px) scale(0.4);
  }
}
.ms-trail {
  animation: ms-trail-scroll 1.6s ease-out 120ms infinite;
}

@media (prefers-reduced-motion: reduce) {
  .ms-dot {
    animation: none !important;
    opacity: 1 !important;
    transform: translateY(0) !important;
  }
  .ms-trail {
    animation: none !important;
    opacity: 0 !important;
  }
}

import { CSSProperties } from "react";
import styles from "./MouseScrollHint.module.scss";

export interface MouseScrollHintProps {
  duration?: string;
  easing?: string;
  color?: string;
}

export default function MouseScrollHint({
  duration = "1.6s",
  easing = "ease-out",
  color = "#17141a",
}: MouseScrollHintProps) {
  const style = { "--duration": duration, "--easing": easing, "--color": color } as CSSProperties;
  return (
    <div className={styles.mouse} style={style} aria-hidden="true">
      <span className={styles.dot} />
      <span className={styles.trail} />
    </div>
  );
}