03Copy-done feedback

<main class="stage">
  <button class="copy is-demo" type="button">
    <span class="copy__icon" aria-hidden="true">
      <span class="copy__ring"></span>
      <span class="copy__sheet copy__sheet--back"></span>
      <span class="copy__sheet copy__sheet--front"></span>
      <span class="copy__check">
        <span class="copy__check-bar copy__check-bar--short"></span>
        <span class="copy__check-bar copy__check-bar--long"></span>
      </span>
    </span>
    <span class="copy__label">Copy code</span>
    <span class="copy__tip" role="status">Copied</span>
  </button>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-base;                              // 아이콘 전환 시간
$easing: $ease-pop;                                // 배지가 팝업하는 이징
$color: $subject-cream;                             // 아이콘·툴팁 글자색

// ── 데모 무대 ──────────────────────────────────────────
@include stage($stage-orange);

.copy {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: clamp(8px, 2.6vw, 12px);
  border: 0;
  border-radius: $r-control;
  padding: clamp(12px, 4vw, 16px) clamp(18px, 5.6vw, 24px);
  font-weight: 700;
  font-size: clamp(14px, 4vw, 17px);
  line-height: 1;
  font-family: inherit;
  color: $color;
  background: $stage-ink;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;

  &__icon { position: relative; width: 22px; height: 22px; flex: none; }

  // 완료 배지: 체크가 도드라지도록 원형이 팝업한다
  &__ring {
    position: absolute; inset: -3px;
    border-radius: 50%;
    background: $subject-blue;
    opacity: 0;
    transform: scale(.4);
  }

  // 복사 아이콘: 겹친 두 사각형
  &__sheet {
    position: absolute;
    width: 14px; height: 16px;
    border: 2px solid currentColor;
    border-radius: 3px;
    transition: opacity $duration $easing, transform $duration $easing;
  }
  &__sheet--back  { left: 0; top: 0; opacity: .55; }
  &__sheet--front { left: 5px; top: 4px; background: $stage-ink; }

  // 체크 아이콘: 두 획이 scaleX 로 그어진다
  &__check { position: absolute; inset: 0; opacity: 0; }
  &__check-bar {
    position: absolute;
    height: 3px;
    border-radius: 2px;
    background: currentColor;
    transform-origin: left center; // 규칙8: 체크 막대 같은 꼭짓점
  }
  &__check-bar--short { width: 6px; left: 7px; top: 13px; transform: rotate(225deg) scaleX(0); }   // 같은 꼭짓점(7,13)에서 출발
  &__check-bar--long  { width: 12px; left: 7px; top: 13px; transform: rotate(-52deg) scaleX(0); }

  // 툴팁: 위로 살짝 떠올랐다가 사라진다
  &__tip {
    position: absolute;
    left: 50%; bottom: 100%;
    transform: translate(-50%, 4px);
    margin-bottom: 8px;
    padding: 5px 10px;
    border-radius: $r-pill;
    background: $stage-ink;
    color: $color;
    font-weight: 700;
    font-size: clamp(11px, 3vw, 13px);
    line-height: 1;
    font-family: inherit;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
  }

  &.is-copied &__ring { animation: ring-pop $duration $easing forwards; }
  &.is-copied &__sheet--front { opacity: 0; transform: scale(.6); transition-delay: 0s; }
  &.is-copied &__sheet--back  { opacity: 0; transform: scale(.6); }
  &.is-copied &__check { animation: check-in $duration $easing forwards; }
  &.is-copied &__check-bar--short { animation: bar-short $duration $easing forwards; animation-delay: $duration * .3; }
  &.is-copied &__check-bar--long  { animation: bar-long $duration $easing forwards; animation-delay: $duration * .45; }
  &.is-copied &__tip { animation: tip-float 1.4s $easing forwards; }

  &.is-demo &__ring      { animation: ring-pop-loop $dur-loop $easing infinite; }
  &.is-demo &__sheet     { animation: sheet-loop $dur-loop $easing infinite; }
  &.is-demo &__check     { animation: check-in-loop $dur-loop $easing infinite; }
  &.is-demo &__check-bar--short { animation: bar-short-loop $dur-loop $easing infinite; }
  &.is-demo &__check-bar--long  { animation: bar-long-loop $dur-loop $easing infinite; }
  &.is-demo &__tip        { animation: tip-float-loop $dur-loop $easing infinite; }
}

@keyframes ring-pop { from { opacity: 0; transform: scale(.4); } to { opacity: 1; transform: scale(1); } }
@keyframes ring-pop-loop {
  0%, 32%  { opacity: 0; transform: scale(.4); }
  40%, 78% { opacity: 1; transform: scale(1); }
  92%, 100% { opacity: 0; transform: scale(.4); }
}
@keyframes check-in { to { opacity: 1; } }
@keyframes bar-short { to { transform: rotate(225deg) scaleX(1); } }
@keyframes bar-long  { to { transform: rotate(-52deg) scaleX(1); } }
@keyframes tip-float {
  0%   { opacity: 0; transform: translate(-50%, 4px); }
  15%  { opacity: 1; transform: translate(-50%, -2px); }
  85%  { opacity: 1; transform: translate(-50%, -2px); }
  100% { opacity: 0; transform: translate(-50%, -10px); }
}

@keyframes sheet-loop {
  0%, 18%   { opacity: 1; transform: scale(1); }
  35%, 82%  { opacity: 0; transform: scale(.6); }
  95%, 100% { opacity: 1; transform: scale(1); }
}

@keyframes check-in-loop {
  0%, 32%  { opacity: 0; }
  40%, 78% { opacity: 1; }
  92%, 100% { opacity: 0; }
}
@keyframes bar-short-loop {
  0%, 35%  { transform: rotate(225deg) scaleX(0); }
  45%, 75% { transform: rotate(225deg) scaleX(1); }
  92%, 100% { transform: rotate(225deg) scaleX(0); }
}
@keyframes bar-long-loop {
  0%, 40%  { transform: rotate(-52deg) scaleX(0); }
  50%, 75% { transform: rotate(-52deg) scaleX(1); }
  92%, 100% { transform: rotate(-52deg) scaleX(0); }
}
@keyframes tip-float-loop {
  0%, 15%  { opacity: 0; transform: translate(-50%, 4px); }
  32%      { opacity: 1; transform: translate(-50%, -2px); }
  75%      { opacity: 1; transform: translate(-50%, -2px); }
  90%, 100% { opacity: 0; transform: translate(-50%, -10px); }
}

// ── 접근성: 움직임 줄이기 설정이면 상태만 바뀌고 과정은 생략 ────
@media (prefers-reduced-motion: reduce) {
  .copy__ring, .copy__sheet, .copy__check, .copy__check-bar, .copy__tip { animation: none !important; transition: none !important; }
  .copy.is-copied .copy__ring { opacity: 1; transform: scale(1); }
  .copy.is-copied .copy__sheet { opacity: 0; }
  .copy.is-copied .copy__check { opacity: 1; }
  .copy.is-copied .copy__check-bar--short { transform: rotate(225deg) scaleX(1); }
  .copy.is-copied .copy__check-bar--long  { transform: rotate(-52deg) scaleX(1); }
  .copy.is-copied .copy__tip { opacity: 1; transform: translate(-50%, -2px); }
}

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);
}

.copy {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: clamp(8px, 2.6vw, 12px);
  border: 0;
  border-radius: 12px;
  padding: clamp(12px, 4vw, 16px) clamp(18px, 5.6vw, 24px);
  font-weight: 700;
  font-size: clamp(14px, 4vw, 17px);
  line-height: 1;
  font-family: inherit;
  color: #fff7e6;
  background: #17141a;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.copy__icon {
  position: relative;
  width: 22px;
  height: 22px;
  flex: none;
}
.copy__ring {
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: #2f6df6;
  opacity: 0;
  transform: scale(0.4);
}
.copy__sheet {
  position: absolute;
  width: 14px;
  height: 16px;
  border: 2px solid currentColor;
  border-radius: 3px;
  transition: opacity 300ms cubic-bezier(0.2, 1.4, 0.4, 1), transform 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}
.copy__sheet--back {
  left: 0;
  top: 0;
  opacity: 0.55;
}
.copy__sheet--front {
  left: 5px;
  top: 4px;
  background: #17141a;
}
.copy__check {
  position: absolute;
  inset: 0;
  opacity: 0;
}
.copy__check-bar {
  position: absolute;
  height: 3px;
  border-radius: 2px;
  background: currentColor;
  transform-origin: left center;
}
.copy__check-bar--short {
  width: 6px;
  left: 7px;
  top: 13px;
  transform: rotate(225deg) scaleX(0);
}
.copy__check-bar--long {
  width: 12px;
  left: 7px;
  top: 13px;
  transform: rotate(-52deg) scaleX(0);
}
.copy__tip {
  position: absolute;
  left: 50%;
  bottom: 100%;
  transform: translate(-50%, 4px);
  margin-bottom: 8px;
  padding: 5px 10px;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  font-weight: 700;
  font-size: clamp(11px, 3vw, 13px);
  line-height: 1;
  font-family: inherit;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
}
.copy.is-copied .copy__ring {
  animation: ring-pop 300ms cubic-bezier(0.2, 1.4, 0.4, 1) forwards;
}
.copy.is-copied .copy__sheet--front {
  opacity: 0;
  transform: scale(0.6);
  transition-delay: 0s;
}
.copy.is-copied .copy__sheet--back {
  opacity: 0;
  transform: scale(0.6);
}
.copy.is-copied .copy__check {
  animation: check-in 300ms cubic-bezier(0.2, 1.4, 0.4, 1) forwards;
}
.copy.is-copied .copy__check-bar--short {
  animation: bar-short 300ms cubic-bezier(0.2, 1.4, 0.4, 1) forwards;
  animation-delay: 90ms;
}
.copy.is-copied .copy__check-bar--long {
  animation: bar-long 300ms cubic-bezier(0.2, 1.4, 0.4, 1) forwards;
  animation-delay: 135ms;
}
.copy.is-copied .copy__tip {
  animation: tip-float 1.4s cubic-bezier(0.2, 1.4, 0.4, 1) forwards;
}
.copy.is-demo .copy__ring {
  animation: ring-pop-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}
.copy.is-demo .copy__sheet {
  animation: sheet-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}
.copy.is-demo .copy__check {
  animation: check-in-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}
.copy.is-demo .copy__check-bar--short {
  animation: bar-short-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}
.copy.is-demo .copy__check-bar--long {
  animation: bar-long-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}
.copy.is-demo .copy__tip {
  animation: tip-float-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes ring-pop {
  from {
    opacity: 0;
    transform: scale(0.4);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes ring-pop-loop {
  0%, 32% {
    opacity: 0;
    transform: scale(0.4);
  }
  40%, 78% {
    opacity: 1;
    transform: scale(1);
  }
  92%, 100% {
    opacity: 0;
    transform: scale(0.4);
  }
}
@keyframes check-in {
  to {
    opacity: 1;
  }
}
@keyframes bar-short {
  to {
    transform: rotate(225deg) scaleX(1);
  }
}
@keyframes bar-long {
  to {
    transform: rotate(-52deg) scaleX(1);
  }
}
@keyframes tip-float {
  0% {
    opacity: 0;
    transform: translate(-50%, 4px);
  }
  15% {
    opacity: 1;
    transform: translate(-50%, -2px);
  }
  85% {
    opacity: 1;
    transform: translate(-50%, -2px);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -10px);
  }
}
@keyframes sheet-loop {
  0%, 18% {
    opacity: 1;
    transform: scale(1);
  }
  35%, 82% {
    opacity: 0;
    transform: scale(0.6);
  }
  95%, 100% {
    opacity: 1;
    transform: scale(1);
  }
}
@keyframes check-in-loop {
  0%, 32% {
    opacity: 0;
  }
  40%, 78% {
    opacity: 1;
  }
  92%, 100% {
    opacity: 0;
  }
}
@keyframes bar-short-loop {
  0%, 35% {
    transform: rotate(225deg) scaleX(0);
  }
  45%, 75% {
    transform: rotate(225deg) scaleX(1);
  }
  92%, 100% {
    transform: rotate(225deg) scaleX(0);
  }
}
@keyframes bar-long-loop {
  0%, 40% {
    transform: rotate(-52deg) scaleX(0);
  }
  50%, 75% {
    transform: rotate(-52deg) scaleX(1);
  }
  92%, 100% {
    transform: rotate(-52deg) scaleX(0);
  }
}
@keyframes tip-float-loop {
  0%, 15% {
    opacity: 0;
    transform: translate(-50%, 4px);
  }
  32% {
    opacity: 1;
    transform: translate(-50%, -2px);
  }
  75% {
    opacity: 1;
    transform: translate(-50%, -2px);
  }
  90%, 100% {
    opacity: 0;
    transform: translate(-50%, -10px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .copy__ring, .copy__sheet, .copy__check, .copy__check-bar, .copy__tip {
    animation: none !important;
    transition: none !important;
  }
  .copy.is-copied .copy__ring {
    opacity: 1;
    transform: scale(1);
  }
  .copy.is-copied .copy__sheet {
    opacity: 0;
  }
  .copy.is-copied .copy__check {
    opacity: 1;
  }
  .copy.is-copied .copy__check-bar--short {
    transform: rotate(225deg) scaleX(1);
  }
  .copy.is-copied .copy__check-bar--long {
    transform: rotate(-52deg) scaleX(1);
  }
  .copy.is-copied .copy__tip {
    opacity: 1;
    transform: translate(-50%, -2px);
  }
}

// 실제 클릭에도 같은 상태(.is-copied)로 반응한다. 데모(.is-demo)는 손을 대면 멈춘다.
document.querySelector('.copy').addEventListener('click', function (e) {
  var b = e.currentTarget;
  b.classList.remove('is-demo');
  b.classList.remove('is-copied');
  void b.offsetWidth;
  b.classList.add('is-copied');
});

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

export type CopyDoneButtonProps = {
  label: string;
  tipLabel: string;
  value: string;
  /** 아이콘 전환 시간 (기본 300ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function CopyDoneButton({
  label,
  tipLabel,
  value,
  duration = 300,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#fff7e6",
}: CopyDoneButtonProps) {
  const [copied, setCopied] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  useEffect(() => {
    if (!copied) return;
    const t = setTimeout(() => setCopied(false), 1400);
    return () => clearTimeout(t);
  }, [copied]);

  const handle = async () => {
    try {
      await navigator.clipboard.writeText(value);
    } catch {
      /* 클립보드 권한이 없어도 UI 는 그대로 반응한다 */
    }
    setCopied(true);
  };

  return (
    <button
      type="button"
      className={copied ? `${styles.copy} ${styles.copied}` : styles.copy}
      style={vars}
      onClick={handle}
    >
      <span className={styles.icon} aria-hidden="true">
        <span className={styles.ring} />
        <span className={`${styles.sheet} ${styles.sheetBack}`} />
        <span className={`${styles.sheet} ${styles.sheetFront}`} />
        <span className={styles.check}>
          <span className={`${styles.bar} ${styles.barShort}`} />
          <span className={`${styles.bar} ${styles.barLong}`} />
        </span>
      </span>
      <span>{label}</span>
      <span className={styles.tip} role="status">{tipLabel}</span>
    </button>
  );
}