07試行履歴フェードリスト — 新しい試行が積まれるたびに古い記録ほど不透明度の値が下がる方式

<main class="stage">
<div class="ahf is-demo" id="ahf">
  <button class="ahf__btn" id="ahfBtn" type="button">ログイン試行を追加</button>
  <ul class="ahf__list" id="ahfList"></ul>
</div>
</main>

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

// 계산 겹: i번째(0=최신) 기록의 불투명도 = max(최소, 1 − i×STEP) — index.html 참조
@include stage($stage-orange);

.ahf {
  width: 100%;
  max-width: 300px;
  display: grid;
  gap: $sp-3;
  justify-items: center;
}

.ahf__btn {
  border: 0;
  border-radius: $r-control;
  padding: $sp-2 $sp-4;
  background: $stage-ink;
  color: $subject-cream;
  font: 700 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform $dur-instant $ease-out;

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

.ahf__list {
  width: 100%;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: $sp-2;
}

.ahf__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: $sp-2 $sp-3;
  border-radius: $r-sm;
  background: $subject-cream;
  font: 600 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  animation: ahf-in $dur-quick $ease-out backwards;
}

@keyframes ahf-in {
  from { transform: translateY(-8px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.ahf__time { color: rgba($stage-ink, .6); }

.ahf__result { color: $stage-ink; }

.ahf__row--fail .ahf__result { color: $error; }
.ahf__row--ok .ahf__result { color: $subject-blue-deep; }

@media (max-width: 340px) {
  .ahf { max-width: 220px; }
  .ahf__row { font-size: 11px; padding: $sp-2 $sp-2; }
}

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

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);
}

.ahf {
  width: 100%;
  max-width: 300px;
  display: grid;
  gap: 12px;
  justify-items: center;
}

.ahf__btn {
  border: 0;
  border-radius: 12px;
  padding: 8px 16px;
  background: #17141a;
  color: #fff7e6;
  font: 700 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  cursor: pointer;
  transition: transform 140ms ease-out;
}
.ahf__btn:active {
  transform: scale(0.96);
}

.ahf__list {
  width: 100%;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.ahf__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 8px;
  background: #fff7e6;
  font: 600 12px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  animation: ahf-in 220ms ease-out backwards;
}

@keyframes ahf-in {
  from {
    transform: translateY(-8px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}
.ahf__time {
  color: rgba(23, 20, 26, 0.6);
}

.ahf__result {
  color: #17141a;
}

.ahf__row--fail .ahf__result {
  color: #c2361a;
}

.ahf__row--ok .ahf__result {
  color: #0a4fe8;
}

@media (max-width: 340px) {
  .ahf {
    max-width: 220px;
  }
  .ahf__row {
    font-size: 11px;
    padding: 8px 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ahf__btn {
    transition: none;
  }
  .ahf__row {
    animation: none;
  }
}

(function () {
  var root = document.getElementById('ahf');
  var btn = document.getElementById('ahfBtn');
  var list = document.getElementById('ahfList');

  // 상수: 화면에 보이는 최대 기록 수 · 기록 하나마다 낮아지는 투명도 폭 · 최소 투명도
  var MAX_ENTRIES = 5;
  var OPACITY_STEP = 0.18;
  var MIN_OPACITY = 0.16;

  var SEQ = ['失敗', '失敗', '成功', '失敗', '失敗', '失敗', '成功', '失敗'];
  var seqIdx = 0;
  var entries = []; // 최신이 index 0

  function fmtTime(n) {
    var m = String(10 + n % 50).padStart(2, '0');
    return '10:' + m;
  }

  // 계산 겹: i번째(0=최신) 항목의 불투명도 = max(최소, 1 − i×STEP)
  function render() {
    list.innerHTML = '';
    for (var i = 0; i < entries.length; i++) {
      var e = entries[i];
      var op = Math.max(MIN_OPACITY, 1 - i * OPACITY_STEP);
      var li = document.createElement('li');
      li.className = 'ahf__row' + (e.result === '失敗' ? ' ahf__row--fail' : ' ahf__row--ok');
      li.style.opacity = op.toFixed(2);
      li.innerHTML = '<span class="ahf__time">' + e.time + '</span>' +
        '<span class="ahf__result">' + e.result + '</span>';
      list.appendChild(li);
    }
  }

  function addEntry() {
    var result = SEQ[seqIdx % SEQ.length];
    seqIdx += 1;
    entries.unshift({ result: result, time: fmtTime(seqIdx) });
    if (entries.length > MAX_ENTRIES) entries.length = MAX_ENTRIES;
    render();
  }

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

  var autoTimer = null;
  function stopAutoplay() { if (autoTimer) { clearInterval(autoTimer); autoTimer = null; } }
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  if (!reduce) { autoTimer = setInterval(addEntry, 340); }
})();

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

type Box<T> = { current: T };
type Entry = { result: string; time: string };

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

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

    // 상수: 화면에 보이는 최대 기록 수 · 기록 하나마다 낮아지는 투명도 폭 · 최소 투명도
    const MAX_ENTRIES = 5;
    const OPACITY_STEP = 0.18;
    const MIN_OPACITY = 0.16;

    const SEQ = ["실패", "실패", "성공", "실패", "실패", "실패", "성공", "실패"];
    let seqIdx = 0;
    let entries: Entry[] = [];

    function fmtTime(n: number) {
      const m = String(10 + (n % 50)).padStart(2, "0");
      return "10:" + m;
    }

    // 계산 겹: i번째(0=최신) 항목의 불투명도 = max(최소, 1 − i×STEP)
    function render() {
      list!.innerHTML = "";
      for (let i = 0; i < entries.length; i++) {
        const e = entries[i];
        const op = Math.max(MIN_OPACITY, 1 - i * OPACITY_STEP);
        const li = document.createElement("li");
        li.className = styles.row + " " + (e.result === "실패" ? styles["row--fail"] : styles["row--ok"]);
        li.style.opacity = op.toFixed(2);
        li.innerHTML =
          '<span class="' + styles.time + '">' + e.time + "</span>" +
          '<span class="' + styles.result + '">' + e.result + "</span>";
        list!.appendChild(li);
      }
    }

    function addEntry() {
      const result = SEQ[seqIdx % SEQ.length];
      seqIdx += 1;
      entries.unshift({ result, time: fmtTime(seqIdx) });
      if (entries.length > MAX_ENTRIES) entries.length = MAX_ENTRIES;
      render();
    }

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

    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(addEntry, 340); }

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

  return (
    <div ref={rootRef} className={`${styles.stage} ${styles.ahf} ${styles["is-demo"]}`}>
      <button className={styles.btn} type="button">로그인 시도 추가</button>
      <ul className={styles.list} />
    </div>
  );
}