09モーション削減時は静止表示に

<main class="stage">
  <div class="fv9 is-demo">
    <span class="fv9__field">
      <input class="fv9__input" type="text" value="[email protected]" readonly>
      <span class="fv9__status">
        <svg viewBox="0 0 24 24" width="18" height="18" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><polyline points="4,13 9,18 20,6"/></svg>
      </span>
    </span>
    <p class="fv9__msg">確認できました</p>
  </div>
</main>

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

// 평소엔 상태 아이콘이 scale+opacity 로 팝인 후 사라지는 루프지만, 시스템에서 모션을 줄이면 애니메이션이 없어지고 움직임 없이 마지막 상태로 고정 표시된다
$duration: $dur-enter;
$easing: $ease-pop;
$color: $subject-mint;

@include stage($stage-ink);

.fv9 { width: min(240px, 86vw); display: flex; flex-direction: column; gap: $sp-2; }
.fv9__field { position: relative; display: block; }
.fv9__input {
  box-sizing: border-box; width: 100%;
  padding: $sp-2 $sp-8 $sp-2 $sp-3; border-radius: $r-sm;
  border: 2px solid $color; background: rgba(255, 255, 255, .06);
  color: $subject-cream; font-weight: 400; font-size: 14px; line-height: 1; font-family: inherit;
}
.fv9__status {
  position: absolute; right: $sp-3; top: 0; bottom: 0; display: flex; align-items: center; width: 18px;
  color: $color; opacity: 0; transform: scale(.5);
}
// 한 겹: 팝인 순간 아주 옅은 글로우 surge (reduced-motion 에서는 같이 꺼진다 — 이 항목의 교육적 의도)
.fv9__status::after {
  content: ""; position: absolute; inset: -5px; border-radius: 50%; opacity: 0; pointer-events: none;
}
.fv9__msg { margin: 0; color: $color; font-weight: 500; font-size: 11px; line-height: 1.3; font-family: inherit; opacity: 0; }

@keyframes fv9-pop {
  0%, 10% { opacity: 0; transform: scale(.5); }
  40% { opacity: 1; transform: scale(1.15); }
  46% { transform: scale(1.08); } 52% { transform: scale(1.12); } 58% { transform: scale(1); }
  55%, 85% { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(.5); }
}
@keyframes fv9-msg { 0%, 30% { opacity: 0; } 55%, 85% { opacity: 1; } 100% { opacity: 0; } }
@keyframes fv9-surge {
  0%, 38% { opacity: 0; box-shadow: 0 0 0 0 rgba($color, 0); }
  40% { opacity: .35; box-shadow: 0 0 0 3px rgba($color, .3); }
  54% { opacity: 0; box-shadow: 0 0 0 8px rgba($color, 0); }
  100% { opacity: 0; box-shadow: 0 0 0 0 rgba($color, 0); }
}

.fv9.is-demo .fv9__status { animation: fv9-pop $duration $easing infinite; }
.fv9.is-demo .fv9__msg { animation: fv9-msg $duration $easing infinite; }
.fv9.is-demo .fv9__status::after { animation: fv9-surge $duration $easing infinite; }

@media (prefers-reduced-motion: reduce) {
  .fv9.is-demo .fv9__status,
  .fv9.is-demo .fv9__msg { animation: none !important; }
  .fv9.is-demo .fv9__status { opacity: 1; transform: scale(1); }
  .fv9.is-demo .fv9__msg { opacity: 1; }
  .fv9.is-demo .fv9__status::after { animation: none !important; opacity: 0; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.fv9 {
  width: min(240px, 86vw);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fv9__field {
  position: relative;
  display: block;
}

.fv9__input {
  box-sizing: border-box;
  width: 100%;
  padding: 8px 32px 8px 12px;
  border-radius: 8px;
  border: 2px solid #4cd4a6;
  background: rgba(255, 255, 255, 0.06);
  color: #fff7e6;
  font-weight: 400;
  font-size: 14px;
  line-height: 1;
  font-family: inherit;
}

.fv9__status {
  position: absolute;
  right: 12px;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  width: 18px;
  color: #4cd4a6;
  opacity: 0;
  transform: scale(0.5);
}

.fv9__status::after {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
}

.fv9__msg {
  margin: 0;
  color: #4cd4a6;
  font-weight: 500;
  font-size: 11px;
  line-height: 1.3;
  font-family: inherit;
  opacity: 0;
}

@keyframes fv9-pop {
  0%, 10% {
    opacity: 0;
    transform: scale(0.5);
  }
  40% {
    opacity: 1;
    transform: scale(1.15);
  }
  46% {
    transform: scale(1.08);
  }
  52% {
    transform: scale(1.12);
  }
  58% {
    transform: scale(1);
  }
  55%, 85% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(0.5);
  }
}
@keyframes fv9-msg {
  0%, 30% {
    opacity: 0;
  }
  55%, 85% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
@keyframes fv9-surge {
  0%, 38% {
    opacity: 0;
    box-shadow: 0 0 0 0 rgba(76, 212, 166, 0);
  }
  40% {
    opacity: 0.35;
    box-shadow: 0 0 0 3px rgba(76, 212, 166, 0.3);
  }
  54% {
    opacity: 0;
    box-shadow: 0 0 0 8px rgba(76, 212, 166, 0);
  }
  100% {
    opacity: 0;
    box-shadow: 0 0 0 0 rgba(76, 212, 166, 0);
  }
}
.fv9.is-demo .fv9__status {
  animation: fv9-pop 600ms cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.fv9.is-demo .fv9__msg {
  animation: fv9-msg 600ms cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.fv9.is-demo .fv9__status::after {
  animation: fv9-surge 600ms cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .fv9.is-demo .fv9__status,
  .fv9.is-demo .fv9__msg {
    animation: none !important;
  }
  .fv9.is-demo .fv9__status {
    opacity: 1;
    transform: scale(1);
  }
  .fv9.is-demo .fv9__msg {
    opacity: 1;
  }
  .fv9.is-demo .fv9__status::after {
    animation: none !important;
    opacity: 0;
  }
}

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

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

export default function ReducedMotionSafeStatus({ duration = 600, easing = "cubic-bezier(.2,1.4,.4,1)", color = "#4cd4a6" }: ReducedMotionSafeStatusProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <div className={styles.fv9} style={vars}>
      <span className={styles.field}>
        <input className={styles.input} type="text" defaultValue="[email protected]" readOnly />
        <span className={styles.status}>
          <svg viewBox="0 0 24 24" width="18" height="18" fill="none" stroke="currentColor" strokeWidth={3} strokeLinecap="round" strokeLinejoin="round"><polyline points="4,13 9,18 20,6" /></svg>
        </span>
      </span>
      <p className={styles.msg}>확인됐어요</p>
    </div>
  );
}