03Lockout progress ring — the remaining-tries value is shown as a circular progress value

<main class="stage">
<div class="alr is-demo" id="alr">
  <div class="alr__ringwrap">
    <svg class="alr__ring" viewBox="0 0 100 100" width="120" height="120">
      <circle class="alr__track" cx="50" cy="50" r="40"></circle>
      <circle class="alr__prog" id="alrProg" cx="50" cy="50" r="40"></circle>
    </svg>
    <div class="alr__mid">
      <span class="alr__count" id="alrCount">5</span>
      <span class="alr__label">Tries left</span>
    </div>
  </div>
  <button class="alr__btn" id="alrBtn" type="button">Login attempt</button>
</div>
</main>

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

// 계산 겹: stroke-dashoffset = 둘레×(1 − 남은시도/최대시도) — index.html 참조
@include stage($stage-paper);

.alr {
  display: grid;
  justify-items: center;
  gap: $sp-4;
}

.alr__ringwrap {
  position: relative;
  display: grid;
  place-items: center;
}

.alr__ring {
  transform: rotate(-90deg);
}

.alr__track {
  fill: none;
  stroke: rgba($stage-ink, .12);
  stroke-width: 8;
}

.alr__prog {
  fill: none;
  stroke: $subject-blue-deep;
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset $dur-base $ease-out, stroke $dur-base $ease-out;
}

.alr--locked .alr__prog { stroke: $error; }

.alr__mid {
  position: absolute;
  display: grid;
  justify-items: center;
}

.alr__count {
  font: 800 30px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $stage-ink;
  font-variant-numeric: tabular-nums;
}

.alr__label {
  font: 500 11px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: rgba($stage-ink, .6);
}

.alr__btn {
  border: 0;
  border-radius: $r-control;
  padding: $sp-2 $sp-4;
  background: $stage-ink;
  color: $subject-cream;
  font: 700 14px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform $dur-instant $ease-out;

  &:active { transform: scale(.96); }
}

@media (max-width: 340px) {
  .alr__ring { width: 92px; height: 92px; }
  .alr__count { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .alr__prog { 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);
}

.alr {
  display: grid;
  justify-items: center;
  gap: 16px;
}

.alr__ringwrap {
  position: relative;
  display: grid;
  place-items: center;
}

.alr__ring {
  transform: rotate(-90deg);
}

.alr__track {
  fill: none;
  stroke: rgba(23, 20, 26, 0.12);
  stroke-width: 8;
}

.alr__prog {
  fill: none;
  stroke: #0a4fe8;
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 300ms ease-out, stroke 300ms ease-out;
}

.alr--locked .alr__prog {
  stroke: #c2361a;
}

.alr__mid {
  position: absolute;
  display: grid;
  justify-items: center;
}

.alr__count {
  font: 800 30px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #17141a;
  font-variant-numeric: tabular-nums;
}

.alr__label {
  font: 500 11px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: rgba(23, 20, 26, 0.6);
}

.alr__btn {
  border: 0;
  border-radius: 12px;
  padding: 8px 16px;
  background: #17141a;
  color: #fff7e6;
  font: 700 14px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform 140ms ease-out;
}
.alr__btn:active {
  transform: scale(0.96);
}

@media (max-width: 340px) {
  .alr__ring {
    width: 92px;
    height: 92px;
  }
  .alr__count {
    font-size: 24px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .alr__prog {
    transition: none;
  }
}

(function () {
  var root = document.getElementById('alr');
  var btn = document.getElementById('alrBtn');
  var countEl = document.getElementById('alrCount');
  var prog = document.getElementById('alrProg');

  // 상수: 최대 시도 횟수·링 반지름(SVG viewBox 좌표)
  var MAX_TRIES = 5;
  var R = 40;
  var CIRC = 2 * Math.PI * R; // 원둘레
  prog.style.strokeDasharray = CIRC.toFixed(2);

  var remaining = MAX_TRIES;

  // 계산 겹: 링 오프셋 = 둘레 × (1 − 남은/최대) — stroke-dashoffset 산술
  function paint() {
    countEl.textContent = String(remaining);
    var offset = CIRC * (1 - remaining / MAX_TRIES);
    prog.style.strokeDashoffset = offset.toFixed(2);
    root.classList.toggle('alr--locked', remaining <= 0);
  }

  function fail() {
    if (remaining <= 0) { remaining = MAX_TRIES; paint(); return; }
    remaining -= 1;
    paint();
  }

  btn.addEventListener('click', function () {
    root.classList.remove('is-demo');
    stopAutoplay();
    fail();
  });
  paint();

  var autoTimer = null;
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (!reduce) { autoTimer = setInterval(fail, 380); }
})();

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

type Box<T> = { current: T };

export default function AuthAttemptLockoutRing() {
  const rootRef = useRef(null) as unknown as Box<HTMLDivElement | null>;

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    const btn = root.querySelector(`.${styles.btn}`) as HTMLButtonElement | null;
    const countEl = root.querySelector(`.${styles.count}`) as HTMLElement | null;
    const prog = root.querySelector(`.${styles.prog}`) as SVGCircleElement | null;
    if (!btn || !countEl || !prog) return;

    // 상수: 최대 시도 횟수·링 반지름(SVG viewBox 좌표)
    const MAX_TRIES = 5;
    const R = 40;
    const CIRC = 2 * Math.PI * R;
    prog.style.strokeDasharray = CIRC.toFixed(2);

    let remaining = MAX_TRIES;

    // 계산 겹: 링 오프셋 = 둘레 × (1 − 남은/최대) — stroke-dashoffset 산술
    function paint() {
      countEl!.textContent = String(remaining);
      const offset = CIRC * (1 - remaining / MAX_TRIES);
      prog!.style.strokeDashoffset = offset.toFixed(2);
      root!.classList.toggle(styles.locked, remaining <= 0);
    }

    function fail() {
      if (remaining <= 0) { remaining = MAX_TRIES; paint(); return; }
      remaining -= 1;
      paint();
    }

    function onClick() {
      root!.classList.remove(styles["is-demo"]);
      stopAutoplay();
      fail();
    }
    btn.addEventListener("click", onClick);
    paint();

    let autoTimer: number | null = null;
    function stopAutoplay() { if (autoTimer !== null) { window.clearInterval(autoTimer); autoTimer = null; } }
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    if (!reduce) { autoTimer = window.setInterval(fail, 380); }

    return () => {
      stopAutoplay();
      btn.removeEventListener("click", onClick);
    };
  }, []);

  return (
    <div ref={rootRef} className={`${styles.stage} ${styles.alr} ${styles["is-demo"]}`}>
      <div className={styles.ringwrap}>
        <svg className={styles.ring} viewBox="0 0 100 100" width={120} height={120}>
          <circle className={styles.track} cx={50} cy={50} r={40} />
          <circle className={styles.prog} cx={50} cy={50} r={40} />
        </svg>
        <div className={styles.mid}>
          <span className={styles.count}>5</span>
          <span className={styles.label}>남은 시도</span>
        </div>
      </div>
      <button className={styles.btn} type="button">로그인 시도</button>
    </div>
  );
}