05スコアを測るパスワード強度ゲージ

<main class="stage">
  <div class="pg is-demo" id="pg" data-score="1">
    <div class="pg__field">
      <input class="pg__input" id="pg-input" type="text" autocomplete="off" aria-describedby="pg-out" placeholder="パスワードを入力してください">
      <span class="pg__ghost" aria-hidden="true">Bit9na!Shop</span>
    </div>
    <div class="pg__gauge" aria-hidden="true">
      <span class="pg__cell" data-cell="1"></span>
      <span class="pg__cell" data-cell="2"></span>
      <span class="pg__cell" data-cell="3"></span>
      <span class="pg__cell" data-cell="4"></span>
    </div>
    <p class="pg__out" id="pg-out">
      <span class="pg__words" aria-hidden="true">
        <span class="pg__w" data-w="low">弱い</span><span class="pg__w" data-w="mid">普通</span><span class="pg__w" data-w="high">強い</span>
      </span>
      <span class="pg__nums" aria-hidden="true">
        <span class="pg__n" data-n="0">0 / 4</span><span class="pg__n" data-n="1">1 / 4</span><span class="pg__n" data-n="2">2 / 4</span><span class="pg__n" data-n="3">3 / 4</span><span class="pg__n" data-n="4">4 / 4</span>
      </span>
      <span class="pg__say" id="pg-say" role="status" aria-live="polite">4つの条件のうち1つだけ満たしています</span>
    </p>
  </div>
</main>

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

$duration: $dur-quick;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-ink);

$low:  $error;
$mid:  #cab493;
$high: $subject-mint;

.pg {
  box-sizing: border-box;
  width: min(300px, 86vw);
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.pg__field { position: relative; }
.pg__input {
  box-sizing: border-box;
  width: 100%; height: 40px;
  padding: 0 $sp-3;
  border: 2px solid rgba(255, 255, 255, .18);
  border-radius: $r-control;
  background: rgba(255, 255, 255, .06);
  color: $subject-cream;
  font-family: inherit;
  font-size: 14px; line-height: 36px; font-weight: 700;
  letter-spacing: .04em;
}
.pg__input::placeholder { color: rgba(255, 255, 255, .38); font-weight: 600; letter-spacing: normal; }
.pg__input:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

// 자동 루프에서만 보이는 "쳐 넣는 글자". 진짜 placeholder 와 겹치지 않게 지운다
.pg.is-demo .pg__input::placeholder { color: transparent; }
.pg__ghost {
  position: absolute;
  left: 14px; top: 0;
  color: $subject-cream;
  font-size: 14px; line-height: 40px; font-weight: 700;
  letter-spacing: .04em;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
}

// ── 네 칸 게이지 — 칸마다 왼쪽에서 자란다 ────────────────
.pg__gauge {
  // 격자로 넷을 똑같이 나눈다 — flex 균등분배(1 1 0)는 고정 px 지오메트리와 섞이면 어긋난다
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: $sp-1;
  margin-top: $sp-3;
}
.pg__cell {
  position: relative;
  height: 6px;
  border-radius: $r-pill;
  background: rgba(255, 255, 255, .14);
  overflow: hidden;
}
.pg__cell::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: $r-pill;
  background: $low;
  transform: scaleX(0);
  transform-origin: left center; // 규칙8: 네 칸 게이지 좌측 채움
  transition: transform $duration $easing, background $duration $easing;
}
.pg[data-score="1"] .pg__cell[data-cell="1"]::after,
.pg[data-score="2"] .pg__cell[data-cell="1"]::after,
.pg[data-score="2"] .pg__cell[data-cell="2"]::after,
.pg[data-score="3"] .pg__cell[data-cell="1"]::after,
.pg[data-score="3"] .pg__cell[data-cell="2"]::after,
.pg[data-score="3"] .pg__cell[data-cell="3"]::after,
.pg[data-score="4"] .pg__cell::after { transform: scaleX(1); }
.pg[data-score="2"] .pg__cell::after,
.pg[data-score="3"] .pg__cell::after { background: $mid; }
.pg[data-score="4"] .pg__cell::after { background: $high; }

// ── 등급 한 줄 — 낱말과 점수를 겹쳐 두고 하나만 켠다 ──────
.pg__out {
  position: relative;
  display: flex;
  align-items: center;
  gap: $sp-2;
  height: 16px;
  margin: $sp-2 0 0;
  font-size: 11px; line-height: 16px; font-weight: 700;
}
.pg__words, .pg__nums {
  position: relative;
  display: inline-block;
  flex: 0 0 auto;
  height: 16px;
}
.pg__words { width: 28px; }
.pg__nums  { width: 32px; color: rgba(255, 255, 255, .52); }
.pg__w, .pg__n {
  position: absolute;
  left: 0; top: 0;
  white-space: nowrap;
  opacity: 0;
}
.pg__w[data-w="low"]  { color: $low; }
.pg__w[data-w="mid"]  { color: $mid; }
.pg__w[data-w="high"] { color: $high; }
.pg[data-score="0"] .pg__w[data-w="low"],
.pg[data-score="1"] .pg__w[data-w="low"],
.pg[data-score="2"] .pg__w[data-w="mid"],
.pg[data-score="3"] .pg__w[data-w="mid"],
.pg[data-score="4"] .pg__w[data-w="high"] { opacity: 1; }
.pg[data-score="0"] .pg__n[data-n="0"],
.pg[data-score="1"] .pg__n[data-n="1"],
.pg[data-score="2"] .pg__n[data-n="2"],
.pg[data-score="3"] .pg__n[data-n="3"],
.pg[data-score="4"] .pg__n[data-n="4"] { opacity: 1; }
.pg__say {
  // 등급은 눈으로 칸이 말해 준다 — 문장은 낭독기 쪽으로만 보낸다
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

// ── 자동 루프 (2s) ────────────────────────────────────
// 0~16% 1점 → 24% 2점 → 42% 3점 → 60% 4점(강함이 가장 큰 변화 = poster)
// → 76·80·84% 칸을 하나씩 흩어서 끄고 88% 되감기. 등급 낱말 교체는 steps(1, end) 컷 — 겹치면 두 낱말이 반투명하게 포개진다.
.pg.is-demo .pg__ghost {
  opacity: 1;
  animation-name: pg-type;
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.pg.is-demo .pg__cell::after {
  transition: none;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.pg.is-demo .pg__cell[data-cell="1"]::after { animation-name: pg-c1; }
.pg.is-demo .pg__cell[data-cell="2"]::after { animation-name: pg-c2; }
.pg.is-demo .pg__cell[data-cell="3"]::after { animation-name: pg-c3; }
.pg.is-demo .pg__cell[data-cell="4"]::after { animation-name: pg-c4; }
.pg.is-demo .pg__w,
.pg.is-demo .pg__n {
  animation-duration: $dur-loop;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.pg.is-demo .pg__w[data-w="low"]  { animation-name: pg-w-low; }
.pg.is-demo .pg__w[data-w="mid"]  { animation-name: pg-w-mid; }
.pg.is-demo .pg__w[data-w="high"] { animation-name: pg-w-high; }
.pg.is-demo .pg__n[data-n="1"] { animation-name: pg-n1; }
.pg.is-demo .pg__n[data-n="2"] { animation-name: pg-n2; }
.pg.is-demo .pg__n[data-n="3"] { animation-name: pg-n3; }
.pg.is-demo .pg__n[data-n="4"] { animation-name: pg-n4; }

@keyframes pg-type {
  0%   { clip-path: inset(0 64% 0 0); }
  24%  { clip-path: inset(0 46% 0 0); }
  42%  { clip-path: inset(0 22% 0 0); }
  60%  { clip-path: inset(0 0 0 0); }
  88%  { clip-path: inset(0 64% 0 0); }
  100% { clip-path: inset(0 64% 0 0); }
}
@keyframes pg-c1 {
  0%     { transform: scaleX(1); background: $low; }
  23.4%  { transform: scaleX(1); background: $low; }
  24%    { transform: scaleX(1); background: $mid; }
  59.4%  { transform: scaleX(1); background: $mid; }
  60%    { transform: scaleX(1); background: $high; }
  84.4%  { transform: scaleX(1); background: $high; }
  85%    { transform: scaleX(1); background: $low; }
  100%   { transform: scaleX(1); background: $low; }
}
@keyframes pg-c2 {
  0%     { transform: scaleX(0); background: $mid; }
  20%    { transform: scaleX(0); background: $mid; }
  24%    { transform: scaleX(1); background: $mid; }
  30%    { transform: scaleX(1); background: $mid; }
  59.4%  { transform: scaleX(1); background: $mid; }
  60%    { transform: scaleX(1); background: $high; }
  83%    { transform: scaleX(1); background: $high; }
  84%    { transform: scaleX(0); background: $high; }
  100%   { transform: scaleX(0); background: $high; }
}
@keyframes pg-c3 {
  0%     { transform: scaleX(0); background: $mid; }
  38%    { transform: scaleX(0); background: $mid; }
  42%    { transform: scaleX(1); background: $mid; }
  59.4%  { transform: scaleX(1); background: $mid; }
  60%    { transform: scaleX(1); background: $high; }
  79%    { transform: scaleX(1); background: $high; }
  80%    { transform: scaleX(0); background: $high; }
  100%   { transform: scaleX(0); background: $high; }
}
@keyframes pg-c4 {
  0%   { transform: scaleX(0); background: $high; }
  56%  { transform: scaleX(0); background: $high; }
  60%  { transform: scaleX(1); background: $high; }
  75%  { transform: scaleX(1); background: $high; }
  76%  { transform: scaleX(0); background: $high; }
  100% { transform: scaleX(0); background: $high; }
}
@keyframes pg-w-low  { 0% { opacity: 1; } 24% { opacity: 0; } 85% { opacity: 1; } 100% { opacity: 1; } }
@keyframes pg-w-mid  { 0% { opacity: 0; } 24% { opacity: 1; } 60% { opacity: 0; } 100% { opacity: 0; } }
@keyframes pg-w-high { 0% { opacity: 0; } 60% { opacity: 1; } 85% { opacity: 0; } 100% { opacity: 0; } }
@keyframes pg-n1 { 0% { opacity: 1; } 24% { opacity: 0; } 85% { opacity: 1; } 100% { opacity: 1; } }
@keyframes pg-n2 { 0% { opacity: 0; } 24% { opacity: 1; } 42% { opacity: 0; } 100% { opacity: 0; } }
@keyframes pg-n3 { 0% { opacity: 0; } 42% { opacity: 1; } 60% { opacity: 0; } 100% { opacity: 0; } }
@keyframes pg-n4 { 0% { opacity: 0; } 60% { opacity: 1; } 85% { opacity: 0; } 100% { opacity: 0; } }

// 320×200 — 무대 여백을 뺀 174px 안에 들어가도록 간격을 내린다(올리지 않는다)
@media (max-width: 360px) {
  .pg__input { height: 36px; line-height: 32px; }
  .pg__ghost { line-height: 36px; }
  .pg__gauge { margin-top: $sp-2; }
}

@media (prefers-reduced-motion: reduce) {
  .pg.is-demo .pg__ghost,
  .pg.is-demo .pg__cell::after,
  .pg.is-demo .pg__w,
  .pg.is-demo .pg__n { animation: none !important; }
  .pg.is-demo .pg__ghost { opacity: 1; clip-path: inset(0 0 0 0); }
  .pg.is-demo .pg__cell::after { transform: scaleX(1); background: $high; }
  .pg.is-demo .pg__w[data-w="high"],
  .pg.is-demo .pg__n[data-n="4"] { opacity: 1; }
  .pg__cell::after { transition: none; }
}

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);
}

.pg {
  box-sizing: border-box;
  width: min(300px, 86vw);
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.pg__field {
  position: relative;
}

.pg__input {
  box-sizing: border-box;
  width: 100%;
  height: 40px;
  padding: 0 12px;
  border: 2px solid rgba(255, 255, 255, 0.18);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  color: #fff7e6;
  font-family: inherit;
  font-size: 14px;
  line-height: 36px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.pg__input::placeholder {
  color: rgba(255, 255, 255, 0.38);
  font-weight: 600;
  letter-spacing: normal;
}

.pg__input:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.pg.is-demo .pg__input::placeholder {
  color: transparent;
}

.pg__ghost {
  position: absolute;
  left: 14px;
  top: 0;
  color: #fff7e6;
  font-size: 14px;
  line-height: 40px;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
}

.pg__gauge {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  margin-top: 12px;
}

.pg__cell {
  position: relative;
  height: 6px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.14);
  overflow: hidden;
}

.pg__cell::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 999px;
  background: #c2361a;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1), background 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.pg[data-score="1"] .pg__cell[data-cell="1"]::after,
.pg[data-score="2"] .pg__cell[data-cell="1"]::after,
.pg[data-score="2"] .pg__cell[data-cell="2"]::after,
.pg[data-score="3"] .pg__cell[data-cell="1"]::after,
.pg[data-score="3"] .pg__cell[data-cell="2"]::after,
.pg[data-score="3"] .pg__cell[data-cell="3"]::after,
.pg[data-score="4"] .pg__cell::after {
  transform: scaleX(1);
}

.pg[data-score="2"] .pg__cell::after,
.pg[data-score="3"] .pg__cell::after {
  background: #cab493;
}

.pg[data-score="4"] .pg__cell::after {
  background: #4cd4a6;
}

.pg__out {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 16px;
  margin: 8px 0 0;
  font-size: 11px;
  line-height: 16px;
  font-weight: 700;
}

.pg__words, .pg__nums {
  position: relative;
  display: inline-block;
  flex: 0 0 auto;
  height: 16px;
}

.pg__words {
  width: 28px;
}

.pg__nums {
  width: 32px;
  color: rgba(255, 255, 255, 0.52);
}

.pg__w, .pg__n {
  position: absolute;
  left: 0;
  top: 0;
  white-space: nowrap;
  opacity: 0;
}

.pg__w[data-w=low] {
  color: #c2361a;
}

.pg__w[data-w=mid] {
  color: #cab493;
}

.pg__w[data-w=high] {
  color: #4cd4a6;
}

.pg[data-score="0"] .pg__w[data-w=low],
.pg[data-score="1"] .pg__w[data-w=low],
.pg[data-score="2"] .pg__w[data-w=mid],
.pg[data-score="3"] .pg__w[data-w=mid],
.pg[data-score="4"] .pg__w[data-w=high] {
  opacity: 1;
}

.pg[data-score="0"] .pg__n[data-n="0"],
.pg[data-score="1"] .pg__n[data-n="1"],
.pg[data-score="2"] .pg__n[data-n="2"],
.pg[data-score="3"] .pg__n[data-n="3"],
.pg[data-score="4"] .pg__n[data-n="4"] {
  opacity: 1;
}

.pg__say {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.pg.is-demo .pg__ghost {
  opacity: 1;
  animation-name: pg-type;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.pg.is-demo .pg__cell::after {
  transition: none;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}

.pg.is-demo .pg__cell[data-cell="1"]::after {
  animation-name: pg-c1;
}

.pg.is-demo .pg__cell[data-cell="2"]::after {
  animation-name: pg-c2;
}

.pg.is-demo .pg__cell[data-cell="3"]::after {
  animation-name: pg-c3;
}

.pg.is-demo .pg__cell[data-cell="4"]::after {
  animation-name: pg-c4;
}

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

.pg.is-demo .pg__w[data-w=low] {
  animation-name: pg-w-low;
}

.pg.is-demo .pg__w[data-w=mid] {
  animation-name: pg-w-mid;
}

.pg.is-demo .pg__w[data-w=high] {
  animation-name: pg-w-high;
}

.pg.is-demo .pg__n[data-n="1"] {
  animation-name: pg-n1;
}

.pg.is-demo .pg__n[data-n="2"] {
  animation-name: pg-n2;
}

.pg.is-demo .pg__n[data-n="3"] {
  animation-name: pg-n3;
}

.pg.is-demo .pg__n[data-n="4"] {
  animation-name: pg-n4;
}

@keyframes pg-type {
  0% {
    clip-path: inset(0 64% 0 0);
  }
  24% {
    clip-path: inset(0 46% 0 0);
  }
  42% {
    clip-path: inset(0 22% 0 0);
  }
  60% {
    clip-path: inset(0 0 0 0);
  }
  88% {
    clip-path: inset(0 64% 0 0);
  }
  100% {
    clip-path: inset(0 64% 0 0);
  }
}
@keyframes pg-c1 {
  0% {
    transform: scaleX(1);
    background: #c2361a;
  }
  23.4% {
    transform: scaleX(1);
    background: #c2361a;
  }
  24% {
    transform: scaleX(1);
    background: #cab493;
  }
  59.4% {
    transform: scaleX(1);
    background: #cab493;
  }
  60% {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  84.4% {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  85% {
    transform: scaleX(1);
    background: #c2361a;
  }
  100% {
    transform: scaleX(1);
    background: #c2361a;
  }
}
@keyframes pg-c2 {
  0% {
    transform: scaleX(0);
    background: #cab493;
  }
  20% {
    transform: scaleX(0);
    background: #cab493;
  }
  24% {
    transform: scaleX(1);
    background: #cab493;
  }
  30% {
    transform: scaleX(1);
    background: #cab493;
  }
  59.4% {
    transform: scaleX(1);
    background: #cab493;
  }
  60% {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  83% {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  84% {
    transform: scaleX(0);
    background: #4cd4a6;
  }
  100% {
    transform: scaleX(0);
    background: #4cd4a6;
  }
}
@keyframes pg-c3 {
  0% {
    transform: scaleX(0);
    background: #cab493;
  }
  38% {
    transform: scaleX(0);
    background: #cab493;
  }
  42% {
    transform: scaleX(1);
    background: #cab493;
  }
  59.4% {
    transform: scaleX(1);
    background: #cab493;
  }
  60% {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  79% {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  80% {
    transform: scaleX(0);
    background: #4cd4a6;
  }
  100% {
    transform: scaleX(0);
    background: #4cd4a6;
  }
}
@keyframes pg-c4 {
  0% {
    transform: scaleX(0);
    background: #4cd4a6;
  }
  56% {
    transform: scaleX(0);
    background: #4cd4a6;
  }
  60% {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  75% {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  76% {
    transform: scaleX(0);
    background: #4cd4a6;
  }
  100% {
    transform: scaleX(0);
    background: #4cd4a6;
  }
}
@keyframes pg-w-low {
  0% {
    opacity: 1;
  }
  24% {
    opacity: 0;
  }
  85% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes pg-w-mid {
  0% {
    opacity: 0;
  }
  24% {
    opacity: 1;
  }
  60% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes pg-w-high {
  0% {
    opacity: 0;
  }
  60% {
    opacity: 1;
  }
  85% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes pg-n1 {
  0% {
    opacity: 1;
  }
  24% {
    opacity: 0;
  }
  85% {
    opacity: 1;
  }
  100% {
    opacity: 1;
  }
}
@keyframes pg-n2 {
  0% {
    opacity: 0;
  }
  24% {
    opacity: 1;
  }
  42% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes pg-n3 {
  0% {
    opacity: 0;
  }
  42% {
    opacity: 1;
  }
  60% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes pg-n4 {
  0% {
    opacity: 0;
  }
  60% {
    opacity: 1;
  }
  85% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@media (max-width: 360px) {
  .pg__input {
    height: 36px;
    line-height: 32px;
  }
  .pg__ghost {
    line-height: 36px;
  }
  .pg__gauge {
    margin-top: 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .pg.is-demo .pg__ghost,
  .pg.is-demo .pg__cell::after,
  .pg.is-demo .pg__w,
  .pg.is-demo .pg__n {
    animation: none !important;
  }
  .pg.is-demo .pg__ghost {
    opacity: 1;
    clip-path: inset(0 0 0 0);
  }
  .pg.is-demo .pg__cell::after {
    transform: scaleX(1);
    background: #4cd4a6;
  }
  .pg.is-demo .pg__w[data-w=high],
  .pg.is-demo .pg__n[data-n="4"] {
    opacity: 1;
  }
  .pg__cell::after {
    transition: none;
  }
}

// 실제 동작: 길이·대소문자·숫자·기호 네 조건을 각각 재서 점수를 만들고, 그 점수 하나가 칸 수와 등급을 함께 정한다.
var pg = document.getElementById('pg');
var pgInput = document.getElementById('pg-input');
var pgSay = document.getElementById('pg-say');
var PG_SAY = ['4つの条件をまだ1つも満たしていません', '4つの条件のうち1つだけ満たしています', '4つの条件のうち2つ満たしています',
              'あと1つでパスワードが強くなります', '4つの条件をすべて満たしています'];
function pgScore(v) {
  var n = 0;
  if (/^.{10,}$/.test(v)) n += 1;
  if (/[a-z]/.test(v) && /[A-Z]/.test(v)) n += 1;
  if (/\d/.test(v)) n += 1;
  if (/[^\w\s]/.test(v)) n += 1;
  return n;
}
function pgPaint() {
  pg.classList.remove('is-demo'); // 사람이 손대면 자동 루프를 멈춘다
  var n = pgScore(pgInput.value);
  pg.setAttribute('data-score', String(n));
  pgSay.textContent = PG_SAY[n];
}
pgInput.addEventListener('input', pgPaint);
pgInput.addEventListener('focus', pgPaint);

import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./PasswordScoreGauge.module.scss";

export type PasswordScoreGaugeProps = {
  placeholder?: string;
  words?: [string, string, string];
  messages?: string[];
  /** 자동 재생 루프 (갤러리용). 사람이 손대면 꺼진다 */
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

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

const DEFAULT_MESSAGES = [
  "None of the four rules are met",
  "Only one of the four rules is met",
  "Two rules are met",
  "One more rule and it is strong",
  "All four rules are met",
];

export function scoreOf(v: string) {
  let n = 0;
  if (/^.{10,}$/.test(v)) n += 1;
  if (/[a-z]/.test(v) && /[A-Z]/.test(v)) n += 1;
  if (/\d/.test(v)) n += 1;
  if (/[^\w\s]/.test(v)) n += 1;
  return n;
}

export default function PasswordScoreGauge({
  placeholder = "Type a password",
  words = ["Weak", "Fair", "Strong"],
  messages = DEFAULT_MESSAGES,
  demo = true,
  duration = 220,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: PasswordScoreGaugeProps) {
  const [value, setValue] = useState("");
  const [live, setLive] = useState(demo);

  const score = scoreOf(value);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <div className={`${styles.root} ${live ? styles.isDemo : ""}`} style={vars} data-score={score}>
      <div className={styles.field}>
        <input
          className={styles.input}
          id="pg-input"
          type="text"
          autoComplete="off"
          placeholder={placeholder}
          aria-describedby="pg-out"
          value={value}
          onChange={(e: ChangeEvt) => { setValue(e.target.value); setLive(false); }}
          onFocus={() => setLive(false)}
        />
        <span className={styles.ghost} aria-hidden="true">Bit9na!Shop</span>
      </div>
      <div className={styles.gauge} aria-hidden="true">
        {[1, 2, 3, 4].map((n) => (
          <span key={n} className={styles.cell} data-cell={n} />
        ))}
      </div>
      <p className={styles.out} id="pg-out">
        <span className={styles.words} aria-hidden="true">
          <span className={styles.w} data-w="low">{words[0]}</span>
          <span className={styles.w} data-w="mid">{words[1]}</span>
          <span className={styles.w} data-w="high">{words[2]}</span>
        </span>
        <span className={styles.nums} aria-hidden="true">
          {[0, 1, 2, 3, 4].map((n) => (
            <span key={n} className={styles.n} data-n={n}>{n} / 4</span>
          ))}
        </span>
        <span className={styles.say} role="status" aria-live="polite">{messages[score]}</span>
      </p>
    </div>
  );
}