08認証コード再送信タイマーボタン

<main class="stage">
  <div class="otp is-demo" id="otp">
    <label class="otp__label" for="otp-input">認証コード6桁</label>
    <div class="otp__row">
      <input class="otp__input" id="otp-input" type="text" inputmode="numeric" maxlength="6" placeholder="000000" autocomplete="one-time-code">
      <button class="otp__resend" id="resend" type="button">再送信</button>
    </div>
    <p class="otp__status" id="status" aria-live="polite"></p>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-instant;
$easing: $ease-out;
$color: $subject-blue;    // 버튼 활성 색

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

.otp {
  box-sizing: border-box;
  width: min(280px, 86vw);
  background: $subject-cream;
  border-radius: $r-card;
  padding: $sp-5;
  box-shadow: $shadow-raised;

  &__label {
    display: block;
    margin: 0 0 $sp-2;
    font-weight: 700;
    font-size: 13px;
    line-height: 1;
    font-family: inherit;
    color: $stage-ink;
  }

  &__row {
    display: flex;
    gap: $sp-2;
  }

  &__input {
    box-sizing: border-box;
    flex: 1 1 auto;
    min-width: 0;
    border: 2px solid transparent;
    border-radius: $r-control;
    padding: $sp-3 $sp-3;
    font-weight: 600;
    font-size: clamp(14px, 4.2vw, 16px);
    letter-spacing: .12em;
    font-family: inherit;
    color: $stage-ink;
    background: #fff;
    &:focus { outline: none; border-color: $color; }
  }

  &__resend {
    box-sizing: border-box;
    flex: 0 0 auto;
    border: 0;
    border-radius: $r-control;
    padding: 0 $sp-3;
    font-weight: 700;
    font-size: 12px;
    font-family: inherit;
    color: $stage-paper;
    background: $color;
    cursor: pointer;
    transition: background $duration $easing, opacity $duration $easing;

    &:disabled { background: rgba(23, 20, 26, .3); color: $subject-ink; cursor: not-allowed; }   // 반투명 먹 위 흰 글자 2.10:1 → 잉크 8.76:1
    &:focus-visible { outline: 2px solid $stage-ink; outline-offset: 2px; }
  }

  &__status {
    margin: $sp-2 0 0;
    min-height: 14px;
    font-size: 11px;
    line-height: 1.4;
    font-family: inherit;
    color: rgba(23, 20, 26, .6);
  }
}

@media (prefers-reduced-motion: reduce) {
  .otp__resend { transition: none; }
}

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);
}

.otp {
  box-sizing: border-box;
  width: min(280px, 86vw);
  background: #fff7e6;
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}
.otp__label {
  display: block;
  margin: 0 0 8px;
  font-weight: 700;
  font-size: 13px;
  line-height: 1;
  font-family: inherit;
  color: #17141a;
}
.otp__row {
  display: flex;
  gap: 8px;
}
.otp__input {
  box-sizing: border-box;
  flex: 1 1 auto;
  min-width: 0;
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 12px 12px;
  font-weight: 600;
  font-size: clamp(14px, 4.2vw, 16px);
  letter-spacing: 0.12em;
  font-family: inherit;
  color: #17141a;
  background: #fff;
}
.otp__input:focus {
  outline: none;
  border-color: #2f6df6;
}
.otp__resend {
  box-sizing: border-box;
  flex: 0 0 auto;
  border: 0;
  border-radius: 12px;
  padding: 0 12px;
  font-weight: 700;
  font-size: 12px;
  font-family: inherit;
  color: #ffffff;
  background: #2f6df6;
  cursor: pointer;
  transition: background 140ms ease-out, opacity 140ms ease-out;
}
.otp__resend:disabled {
  background: rgba(23, 20, 26, 0.3);
  color: #17141a;
  cursor: not-allowed;
}
.otp__resend:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}
.otp__status {
  margin: 8px 0 0;
  min-height: 14px;
  font-size: 11px;
  line-height: 1.4;
  font-family: inherit;
  color: rgba(23, 20, 26, 0.6);
}

@media (prefers-reduced-motion: reduce) {
  .otp__resend {
    transition: none;
  }
}

(function () {
  var wrap = document.getElementById('otp');
  var input = document.getElementById('otp-input');
  var btn = document.getElementById('resend');
  var status = document.getElementById('status');
  var tickTimer = null;

  function cooldown(seconds, tickMs, onDone) {
    clearInterval(tickTimer);
    var left = seconds;
    btn.disabled = true;
    btn.textContent = left + '秒後に再送信';
    status.textContent = '認証コードを再送信しました';
    tickTimer = setInterval(function () {
      left--;
      if (left <= 0) {
        clearInterval(tickTimer);
        btn.disabled = false;
        btn.textContent = '再送信';
        if (onDone) onDone();
      } else {
        btn.textContent = left + '秒後に再送信';
      }
    }, tickMs);
  }

  function demoLoop() {
    if (!wrap.classList.contains('is-demo')) return;
    cooldown(8, 190, function () { setTimeout(demoLoop, 260); });
  }

  btn.addEventListener('click', function () {
    stopDemo();
    cooldown(60, 1000);
  });
  input.addEventListener('pointerdown', stopDemo);

  function stopDemo() {
    if (!wrap.classList.contains('is-demo')) return;
    wrap.classList.remove('is-demo');
    clearInterval(tickTimer);
    btn.disabled = false;
    btn.textContent = '再送信';
    status.textContent = '';
  }

  demoLoop();
})();

import { useEffect, useRef, useState } from "react";
import styles from "./OtpResend.module.scss";

export type OtpResendProps = {
  seconds?: number;
  onResend?: () => void;
};

export default function OtpResend({ seconds = 60, onResend }: OtpResendProps) {
  const [code, setCode] = useState("");
  const [left, setLeft] = useState(0);
  const [status, setStatus] = useState("");
  const timer = useRef<ReturnType<typeof setInterval> | null>(null);

  useEffect(() => {
    return () => { if (timer.current) clearInterval(timer.current); };
  }, []);

  const resend = () => {
    onResend?.();
    setStatus("인증번호를 다시 보냈습니다");
    setLeft(seconds);
    if (timer.current) clearInterval(timer.current);
    timer.current = setInterval(() => {
      setLeft((prev) => {
        if (prev <= 1) {
          if (timer.current) clearInterval(timer.current);
          return 0;
        }
        return prev - 1;
      });
    }, 1000);
  };

  return (
    <div className={styles.otp}>
      <label className={styles.label} htmlFor="otp-code">인증번호 6자리</label>
      <div className={styles.row}>
        <input
          className={styles.input}
          id="otp-code"
          type="text"
          inputMode="numeric"
          maxLength={6}
          placeholder="000000"
          autoComplete="one-time-code"
          value={code}
          onChange={(e: any) => setCode(e.target.value.replace(/\D/g, ""))}
        />
        <button
          type="button"
          className={styles.resend}
          disabled={left > 0}
          onClick={resend}
        >
          {left > 0 ? `${left}초 후 재전송` : "재전송"}
        </button>
      </div>
      <p className={styles.status} aria-live="polite">{status}</p>
    </div>
  );
}