09복사했다고 잠깐만 말하는 버튼

<main class="stage">
  <div class="cp is-demo">
    <div class="cp__row">
      <code class="cp__code" id="cp-src">npm i godrich-ui</code>
      <button class="cp__btn" id="cp-btn" type="button" aria-label="명령어를 클립보드로 복사">
        <span class="cp__ring" aria-hidden="true"></span>
        <span class="cp__face" data-face="idle">
          <span class="cp__ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="18" height="18"><g fill="currentColor"><path d="M216 40v128h-48V88H88V40Z" opacity=".2"/><path d="M216 32H88a8 8 0 0 0-8 8v40H40a8 8 0 0 0-8 8v128a8 8 0 0 0 8 8h128a8 8 0 0 0 8-8v-40h40a8 8 0 0 0 8-8V40a8 8 0 0 0-8-8m-56 176H48V96h112Zm48-48h-32V88a8 8 0 0 0-8-8H96V48h112Z"/></g></svg></span>
          <span class="cp__t">복사</span>
        </span>
        <span class="cp__face" data-face="done">
          <span class="cp__ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="18" height="18"><g fill="currentColor"><path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2"/><path d="M173.66 98.34a8 8 0 0 1 0 11.32l-56 56a8 8 0 0 1-11.32 0l-24-24a8 8 0 0 1 11.32-11.32L112 148.69l50.34-50.35a8 8 0 0 1 11.32 0M232 128A104 104 0 1 1 128 24a104.11 104.11 0 0 1 104 104m-16 0a88 88 0 1 0-88 88a88.1 88.1 0 0 0 88-88"/></g></svg></span>
          <span class="cp__t">복사됨</span>
        </span>
      </button>
    </div>
    <p class="cp__live" role="status" aria-live="polite">
      <span class="cp__word">명령어를 복사했습니다</span>
    </p>
  </div>
</main>

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

$duration: $dur-quick;
$easing: $ease-pop;
$color: $subject-mint;

@include stage($stage-ink);

.cp {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-3;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.cp__row {
  display: flex;
  align-items: stretch;
  gap: $sp-2;
}
.cp__code {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  padding: 0 $sp-3;
  height: 44px;
  border-radius: $r-sm;
  background-color: $subject-cream;
  color: $subject-ink;
  font-family: "Space Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
  white-space: nowrap;
}

.cp__btn {
  position: relative;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  width: 92px;
  height: 44px;
  overflow: visible;
  border: 0;
  border-radius: $r-control;
  background-color: $subject-cream;
  color: $subject-ink;
  cursor: pointer;
}
.cp__btn:focus-visible { outline: 3px solid $color; outline-offset: 3px; }

// 복사된 순간에만 한 번 퍼지는 테두리 — 되돌아올 때는 없으므로 대표 프레임이 '복사됨' 쪽으로 잡힌다
.cp__ring {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  border: 3px solid $color;
  border-radius: $r-control;
  opacity: 0;
}

.cp__face {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: $sp-2;
  opacity: 0;
}
.cp__ic { display: inline-flex; flex: 0 0 auto; }
.cp__ic svg { display: block; }
.cp__t {
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
  white-space: nowrap;
}

// 사람이 실제로 누른 경로
.cp:not(.is-demo) .cp__face[data-face="idle"] { opacity: 1; }
.cp:not(.is-demo)[data-copied="1"] .cp__face[data-face="idle"] { opacity: 0; }
.cp:not(.is-demo)[data-copied="1"] .cp__face[data-face="done"] { opacity: 1; }
.cp:not(.is-demo)[data-copied="1"] .cp__btn { background-color: $color; }

.cp__live {
  margin: 0;
  height: 18px;
}
.cp__word {
  display: block;
  font-size: 12px;
  line-height: 18px;
  font-weight: 500;
  color: $subject-cream;
  opacity: 0;
}
.cp:not(.is-demo)[data-copied="1"] .cp__word { opacity: 1; }

// ── 자동 루프: 35% 에 복사로 끊고, 되돌림은 76%(아이콘)·84%(색·라벨) 로 나눠 한 번에 커지지 않게 한다 ──
.cp.is-demo .cp__face {
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.cp.is-demo .cp__face[data-face="idle"] { animation-name: cp-idle; }
.cp.is-demo .cp__face[data-face="done"] { animation-name: cp-done; }
@keyframes cp-idle {
  0%   { opacity: 1; }
  35%  { opacity: 0; }
  76%  { opacity: 1; }
  100% { opacity: 1; }
}
@keyframes cp-done {
  0%   { opacity: 0; }
  35%  { opacity: 1; }
  76%  { opacity: 0; }
  100% { opacity: 0; }
}

.cp.is-demo .cp__btn {
  animation-name: cp-skin, cp-tap;
  animation-duration: $dur-loop, $dur-loop;
  animation-timing-function: steps(1, end), $easing;
  animation-iteration-count: infinite, infinite;
}
@keyframes cp-skin {
  0%   { background-color: $subject-cream; }
  35%  { background-color: $color; }
  84%  { background-color: $subject-cream; }
  100% { background-color: $subject-cream; }
}
@keyframes cp-tap {
  0%   { transform: scale(1); }
  30%  { transform: scale(1); }
  35%  { transform: scale(.92); }
  44%  { transform: scale(1.04); }
  54%  { transform: scale(1); }
  100% { transform: scale(1); }
}

.cp.is-demo .cp__ring {
  animation-name: cp-ring;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
@keyframes cp-ring {
  0%   { opacity: 0; transform: scale(1); }
  35%  { opacity: 1; transform: scale(1); }
  52%  { opacity: 0; transform: scale(1.4); }
  100% { opacity: 0; transform: scale(1.4); }
}

.cp.is-demo .cp__word {
  animation-name: cp-say;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
@keyframes cp-say {
  0%   { opacity: 0; }
  35%  { opacity: 1; }
  84%  { opacity: 0; }
  100% { opacity: 0; }
}

@media (max-width: 340px) {
  .cp { gap: $sp-2; }
  .cp__row { gap: $sp-1; }
  .cp__code { font-size: 11px; line-height: 16px; padding: 0 $sp-2; }
  .cp__btn { width: 76px; }
  .cp__t { font-size: 11px; line-height: 16px; }
  .cp__word { font-size: 11px; line-height: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .cp.is-demo .cp__face,
  .cp.is-demo .cp__btn,
  .cp.is-demo .cp__ring,
  .cp.is-demo .cp__word { animation: none !important; }
  .cp.is-demo .cp__face[data-face="idle"] { opacity: 1; }
}

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);
}

.cp {
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.cp__row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.cp__code {
  box-sizing: border-box;
  display: flex;
  align-items: center;
  padding: 0 12px;
  height: 44px;
  border-radius: 8px;
  background-color: #fff7e6;
  color: #17141a;
  font-family: "Space Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
  white-space: nowrap;
}

.cp__btn {
  position: relative;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  width: 92px;
  height: 44px;
  overflow: visible;
  border: 0;
  border-radius: 12px;
  background-color: #fff7e6;
  color: #17141a;
  cursor: pointer;
}

.cp__btn:focus-visible {
  outline: 3px solid #4cd4a6;
  outline-offset: 3px;
}

.cp__ring {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  border: 3px solid #4cd4a6;
  border-radius: 12px;
  opacity: 0;
}

.cp__face {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  opacity: 0;
}

.cp__ic {
  display: inline-flex;
  flex: 0 0 auto;
}

.cp__ic svg {
  display: block;
}

.cp__t {
  font-size: 13px;
  line-height: 20px;
  font-weight: 700;
  white-space: nowrap;
}

.cp:not(.is-demo) .cp__face[data-face=idle] {
  opacity: 1;
}

.cp:not(.is-demo)[data-copied="1"] .cp__face[data-face=idle] {
  opacity: 0;
}

.cp:not(.is-demo)[data-copied="1"] .cp__face[data-face=done] {
  opacity: 1;
}

.cp:not(.is-demo)[data-copied="1"] .cp__btn {
  background-color: #4cd4a6;
}

.cp__live {
  margin: 0;
  height: 18px;
}

.cp__word {
  display: block;
  font-size: 12px;
  line-height: 18px;
  font-weight: 500;
  color: #fff7e6;
  opacity: 0;
}

.cp:not(.is-demo)[data-copied="1"] .cp__word {
  opacity: 1;
}

.cp.is-demo .cp__face {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.cp.is-demo .cp__face[data-face=idle] {
  animation-name: cp-idle;
}

.cp.is-demo .cp__face[data-face=done] {
  animation-name: cp-done;
}

@keyframes cp-idle {
  0% {
    opacity: 1;
  }
  35% {
    opacity: 0;
  }
  76% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes cp-done {
  0% {
    opacity: 0;
  }
  35% {
    opacity: 1;
  }
  76% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
.cp.is-demo .cp__btn {
  animation-name: cp-skin, cp-tap;
  animation-duration: 2s, 2s;
  animation-timing-function: steps(1, end), cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite, infinite;
}

@keyframes cp-skin {
  0% {
    background-color: #fff7e6;
  }
  35% {
    background-color: #4cd4a6;
  }
  84% {
    background-color: #fff7e6;
  }
  100% {
    background-color: #fff7e6;
  }
}
@keyframes cp-tap {
  0% {
    transform: scale(1);
  }
  30% {
    transform: scale(1);
  }
  35% {
    transform: scale(0.92);
  }
  44% {
    transform: scale(1.04);
  }
  54% {
    transform: scale(1);
  }
  100% {
    transform: scale(1);
  }
}
.cp.is-demo .cp__ring {
  animation-name: cp-ring;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

@keyframes cp-ring {
  0% {
    opacity: 0;
    transform: scale(1);
  }
  35% {
    opacity: 1;
    transform: scale(1);
  }
  52% {
    opacity: 0;
    transform: scale(1.4);
  }
  100% {
    opacity: 0;
    transform: scale(1.4);
  }
}
.cp.is-demo .cp__word {
  animation-name: cp-say;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@keyframes cp-say {
  0% {
    opacity: 0;
  }
  35% {
    opacity: 1;
  }
  84% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@media (max-width: 340px) {
  .cp {
    gap: 8px;
  }
  .cp__row {
    gap: 4px;
  }
  .cp__code {
    font-size: 11px;
    line-height: 16px;
    padding: 0 8px;
  }
  .cp__btn {
    width: 76px;
  }
  .cp__t {
    font-size: 11px;
    line-height: 16px;
  }
  .cp__word {
    font-size: 11px;
    line-height: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cp.is-demo .cp__face,
  .cp.is-demo .cp__btn,
  .cp.is-demo .cp__ring,
  .cp.is-demo .cp__word {
    animation: none !important;
  }
  .cp.is-demo .cp__face[data-face=idle] {
    opacity: 1;
  }
}

// 실제 동작: 클립보드로 실제로 넘긴 뒤에만 라벨을 바꾼다. 같은 말이 읽히는 영역으로도 한 번 나간다
var root = document.querySelector('.cp');
var btn = document.getElementById('cp-btn');
var src = document.getElementById('cp-src');
var resetTimer = 0;
btn.addEventListener('click', function () {
  root.classList.remove('is-demo');
  var finish = function () {
    root.setAttribute('data-copied', '1');
    clearTimeout(resetTimer);
    resetTimer = setTimeout(function () { root.removeAttribute('data-copied'); }, 1600);
  };
  if (navigator.clipboard && navigator.clipboard.writeText) {
    navigator.clipboard.writeText(src.textContent).then(finish, finish);
  } else {
    finish();
  }
});

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

export type CopyFeedbackButtonProps = {
  code?: string;
  idleLabel?: string;
  doneLabel?: string;
  liveMessage?: string;
  buttonLabel?: string;
  holdMs?: number;
  duration?: number;
  easing?: string;
};

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

const COPY_ICON = (
  <g fill="currentColor"><path d="M216 40v128h-48V88H88V40Z" opacity=".2" /><path d="M216 32H88a8 8 0 0 0-8 8v40H40a8 8 0 0 0-8 8v128a8 8 0 0 0 8 8h128a8 8 0 0 0 8-8v-40h40a8 8 0 0 0 8-8V40a8 8 0 0 0-8-8m-56 176H48V96h112Zm48-48h-32V88a8 8 0 0 0-8-8H96V48h112Z" /></g>
);
const DONE_ICON = (
  <g fill="currentColor"><path d="M224 128a96 96 0 1 1-96-96a96 96 0 0 1 96 96" opacity=".2" /><path d="M173.66 98.34a8 8 0 0 1 0 11.32l-56 56a8 8 0 0 1-11.32 0l-24-24a8 8 0 0 1 11.32-11.32L112 148.69l50.34-50.35a8 8 0 0 1 11.32 0M232 128A104 104 0 1 1 128 24a104.11 104.11 0 0 1 104 104m-16 0a88 88 0 1 0-88 88a88.1 88.1 0 0 0 88-88" /></g>
);

export default function CopyFeedbackButton({
  code = "npm i godrich-ui",
  idleLabel = "Copy",
  doneLabel = "Copied",
  liveMessage = "Command copied",
  buttonLabel = "Copy the command to the clipboard",
  holdMs = 1600,
  duration = 220,
  easing = "cubic-bezier(.2,1.4,.4,1)",
}: CopyFeedbackButtonProps) {
  const [demo, setDemo] = useState(true); // 처음엔 자동 루프, 사람이 건드리면 끈다
  const [copied, setCopied] = useState(false);
  const timer = useRef<number | null>(null);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing };

  useEffect(() => () => {
    if (timer.current !== null) window.clearTimeout(timer.current);
  }, []);

  // 클립보드로 실제로 넘긴 뒤에만 라벨을 바꾼다. 실패해도 같은 길로 되돌아온다
  const copy = useCallback(() => {
    setDemo(false);
    const finish = () => {
      setCopied(true);
      if (timer.current !== null) window.clearTimeout(timer.current);
      timer.current = window.setTimeout(() => setCopied(false), holdMs);
    };
    if (navigator.clipboard && navigator.clipboard.writeText) {
      navigator.clipboard.writeText(code).then(finish, finish);
    } else {
      finish();
    }
  }, [code, holdMs]);

  return (
    <div
      className={`${styles.cp} ${demo ? styles.isDemo : ""}`}
      style={vars}
      data-copied={copied ? "1" : "0"}
    >
      <div className={styles.row}>
        <code className={styles.code}>{code}</code>
        <button className={styles.btn} type="button" aria-label={buttonLabel} onClick={copy}>
          <span className={styles.ring} aria-hidden="true" />
          <span className={styles.face} data-face="idle">
            <span className={styles.ic} aria-hidden="true">
              <svg viewBox="0 0 256 256" width="18" height="18">{COPY_ICON}</svg>
            </span>
            <span className={styles.t}>{idleLabel}</span>
          </span>
          <span className={styles.face} data-face="done">
            <span className={styles.ic} aria-hidden="true">
              <svg viewBox="0 0 256 256" width="18" height="18">{DONE_ICON}</svg>
            </span>
            <span className={styles.t}>{doneLabel}</span>
          </span>
        </button>
      </div>
      {/* 같은 말이 읽히는 영역으로도 한 번 나간다 */}
      <p className={styles.live} role="status" aria-live="polite">
        <span className={styles.word}>{liveMessage}</span>
      </p>
    </div>
  );
}