07タップ確認ジッター(エラー揺れではない)

タップ直後の 140ms の間に ±2px 幅で二回だけ揺れ、スマホの触覚エンジンがブルッと鳴る感覚を画面で再現する。左右に三回大きく揺れるエラー表示とは幅も目的も違う。

使いどころいいね・お気に入りなど、タップの成功を短く確認させたいボタン

translate 지터:active0.14초

<main class="stage">
  <button class="btn is-demo" type="button" aria-label="いいね">
    <span class="btn__icon" aria-hidden="true">&#9829;</span>
  </button>
</main>

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

$duration: $dur-instant;                          // 지터가 끝나는 시간 (140ms — 아주 짧게)
$easing: $ease-pop;
$color: $subject-cream;                           // 버튼 색

@include stage($stage-orange);

.btn {
  position: relative;
  border: 0;
  width: 64px;
  height: 64px;
  border-radius: $r-pill;
  display: grid;
  place-items: center;
  background: $color;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;

  // 규칙8 한 겹: 지터와 함께 버튼 바깥으로 두 겹 링이 불규칙하게 번지다 감쇠
  &::after {
    content: "";
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    box-shadow: 0 0 0 0 rgba($error, .42), 0 0 0 0 rgba($error, .24);
    opacity: 0;
    pointer-events: none;
  }
}
.btn__icon {
  font-size: 28px;
  line-height: 1;
  color: rgba($error, .72);                     // AA: 크림 면 위 큰 아이콘 3:1 — 3.26:1
  transition: color $dur-quick;
}

// 좌우로 세 번 크게 흔드는 오류 표시(다른 편의 "shake")와 달리,
// 여기는 ±2px 폭의 아주 짧은 지터 + 하트 채움으로 "탭이 됐다"만 확인시킨다
.btn:active { animation: jitter $duration $easing; }
.btn:active::after { animation: ripple-wave $dur-quick $easing; }
.btn:active .btn__icon { color: $error; }

.btn.is-demo { animation: jitter-loop $dur-loop $easing infinite; }
.btn.is-demo::after { animation: ripple-loop $dur-loop $easing infinite; }
.btn.is-demo .btn__icon { animation: fill-loop $dur-loop $easing infinite; }

@keyframes jitter {
  0%   { transform: scale(1)    translate(0, 0); }
  25%  { transform: scale(1.18) translate(-2px, 1px); }
  50%  { transform: scale(1.1)  translate(2px, -1px); }
  75%  { transform: scale(1.16) translate(-1px, 1px); }
  100% { transform: scale(1)    translate(0, 0); }
}
@keyframes jitter-loop {
  0%, 30%   { transform: scale(1)    translate(0, 0); }
  38%       { transform: scale(1.18) translate(-2px, 1px); }
  46%       { transform: scale(1.1)  translate(2px, -1px); }
  54%       { transform: scale(1.16) translate(-1px, 1px); }
  62%, 100% { transform: scale(1)    translate(0, 0); }
}
@keyframes fill-loop {
  0%, 30%   { color: rgba($error, .72); }
  50%, 100% { color: $error; }
}

@keyframes ripple-wave {
  0%   { box-shadow: 0 0 0 0 rgba($error, .42), 0 0 0 0 rgba($error, .24); opacity: 1; }
  40%  { box-shadow: 0 0 0 8px rgba($error, .18), 0 0 0 3px rgba($error, .22); opacity: .6; }
  100% { box-shadow: 0 0 0 16px rgba($error, 0), 0 0 0 12px rgba($error, 0); opacity: 0; }
}

@keyframes ripple-loop {
  0%, 30%  { box-shadow: 0 0 0 0 rgba($error, .42), 0 0 0 0 rgba($error, .24); opacity: 1; }
  46%      { box-shadow: 0 0 0 8px rgba($error, .18), 0 0 0 3px rgba($error, .22); opacity: .6; }
  62%, 100% { box-shadow: 0 0 0 16px rgba($error, 0), 0 0 0 12px rgba($error, 0); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .btn:active { animation: none; }
  .btn:active::after { animation: none !important; opacity: 0; }
  .btn:active .btn__icon { color: $error; }
  .btn.is-demo, .btn.is-demo .btn__icon { animation: none; }
  .btn.is-demo::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: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.btn {
  position: relative;
  border: 0;
  width: 64px;
  height: 64px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: #fff7e6;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.btn::after {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  box-shadow: 0 0 0 0 rgba(194, 54, 26, 0.42), 0 0 0 0 rgba(194, 54, 26, 0.24);
  opacity: 0;
  pointer-events: none;
}

.btn__icon {
  font-size: 28px;
  line-height: 1;
  color: rgba(194, 54, 26, 0.72);
  transition: color 220ms;
}

.btn:active {
  animation: jitter 140ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.btn:active::after {
  animation: ripple-wave 220ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.btn:active .btn__icon {
  color: #c2361a;
}

.btn.is-demo {
  animation: jitter-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.btn.is-demo::after {
  animation: ripple-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.btn.is-demo .btn__icon {
  animation: fill-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes jitter {
  0% {
    transform: scale(1) translate(0, 0);
  }
  25% {
    transform: scale(1.18) translate(-2px, 1px);
  }
  50% {
    transform: scale(1.1) translate(2px, -1px);
  }
  75% {
    transform: scale(1.16) translate(-1px, 1px);
  }
  100% {
    transform: scale(1) translate(0, 0);
  }
}
@keyframes jitter-loop {
  0%, 30% {
    transform: scale(1) translate(0, 0);
  }
  38% {
    transform: scale(1.18) translate(-2px, 1px);
  }
  46% {
    transform: scale(1.1) translate(2px, -1px);
  }
  54% {
    transform: scale(1.16) translate(-1px, 1px);
  }
  62%, 100% {
    transform: scale(1) translate(0, 0);
  }
}
@keyframes fill-loop {
  0%, 30% {
    color: rgba(194, 54, 26, 0.72);
  }
  50%, 100% {
    color: #c2361a;
  }
}
@keyframes ripple-wave {
  0% {
    box-shadow: 0 0 0 0 rgba(194, 54, 26, 0.42), 0 0 0 0 rgba(194, 54, 26, 0.24);
    opacity: 1;
  }
  40% {
    box-shadow: 0 0 0 8px rgba(194, 54, 26, 0.18), 0 0 0 3px rgba(194, 54, 26, 0.22);
    opacity: 0.6;
  }
  100% {
    box-shadow: 0 0 0 16px rgba(194, 54, 26, 0), 0 0 0 12px rgba(194, 54, 26, 0);
    opacity: 0;
  }
}
@keyframes ripple-loop {
  0%, 30% {
    box-shadow: 0 0 0 0 rgba(194, 54, 26, 0.42), 0 0 0 0 rgba(194, 54, 26, 0.24);
    opacity: 1;
  }
  46% {
    box-shadow: 0 0 0 8px rgba(194, 54, 26, 0.18), 0 0 0 3px rgba(194, 54, 26, 0.22);
    opacity: 0.6;
  }
  62%, 100% {
    box-shadow: 0 0 0 16px rgba(194, 54, 26, 0), 0 0 0 12px rgba(194, 54, 26, 0);
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .btn:active {
    animation: none;
  }
  .btn:active::after {
    animation: none !important;
    opacity: 0;
  }
  .btn:active .btn__icon {
    color: #c2361a;
  }
  .btn.is-demo, .btn.is-demo .btn__icon {
    animation: none;
  }
  .btn.is-demo::after {
    animation: none !important;
    opacity: 0;
  }
}

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

export type HapticLikeButtonProps = {
  /** 지터가 끝나는 시간 — 아주 짧게 (기본 140ms) */
  duration?: number;
  easing?: string;
  ariaLabel?: string;
};

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

export default function HapticLikeButton({
  duration = 140,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  ariaLabel = "좋아요",
}: HapticLikeButtonProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing };
  return (
    <button type="button" className={styles.btn} style={vars} aria-label={ariaLabel}>
      <span className={styles.icon} aria-hidden="true">&#9829;</span>
    </button>
  );
}

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