06Three staggered stat cards

<main class="stage">
  <div class="cards is-demo">
    <div class="card">
      <span class="card__num" aria-hidden="true"></span>
      <span class="card__sr">356</span>
      <span class="card__label">Members</span>
    </div>
    <div class="card">
      <span class="card__num" aria-hidden="true"></span>
      <span class="card__sr">82</span>
      <span class="card__label">Revenue</span>
    </div>
    <div class="card">
      <span class="card__num" aria-hidden="true"></span>
      <span class="card__sr">5</span>
      <span class="card__label">Rating</span>
    </div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-ink;

@include stage($stage-yellow);

@property --num {
  syntax: '<integer>';
  initial-value: 0;
  inherits: false;
}

.cards {
  display: flex;
  gap: clamp(10px, 3vw, 18px);
}

.card {
  min-width: clamp(64px, 20vw, 88px);
  padding: clamp(10px, 3vw, 16px) clamp(8px, 2.4vw, 12px);
  border-radius: $r-card;
  background: rgba(23, 20, 26, .08);
  text-align: center;

  &__num {
    --num: 0;
    counter-reset: num var(--num);
    display: block;
    font-weight: 800; font-size: clamp(20px, 6vw, 28px); line-height: 1; font-family: inherit;
    font-variant-numeric: tabular-nums;
    color: $color;

    &::before { content: counter(num); }
  }

  &__sr {
    position: absolute;
    width: 1px; height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  &__label {
    display: block;
    margin-top: 4px;
    font-weight: 600; font-size: clamp(10px, 3vw, 12px); line-height: 1; font-family: inherit;
    color: rgba($subject-ink, .72);                  // 흐린 글자는 알파 .72 하한 — 카드 옐로 면 위 5.58:1
  }
}

// 카드 세 장이 동시에 시작하지 않는다 — 순서대로 0.15초씩 늦게
.cards.is-demo .card:nth-child(1) .card__num { animation: count-a $duration $easing infinite; }
.cards.is-demo .card:nth-child(2) .card__num { animation: count-b $duration $easing infinite; animation-delay: .15s; }
.cards.is-demo .card:nth-child(3) .card__num { animation: count-c $duration $easing infinite; animation-delay: .3s; }

@keyframes count-a { 0% { --num: 0; } 55% { --num: 356; } 100% { --num: 356; } }
@keyframes count-b { 0% { --num: 0; } 55% { --num: 82;  } 100% { --num: 82;  } }
@keyframes count-c { 0% { --num: 0; } 55% { --num: 5;   } 100% { --num: 5;   } }

@media (prefers-reduced-motion: reduce) {
  .cards.is-demo .card:nth-child(1) .card__num { animation: none; --num: 356; }
  .cards.is-demo .card:nth-child(2) .card__num { animation: none; --num: 82; }
  .cards.is-demo .card:nth-child(3) .card__num { animation: none; --num: 5; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

@property --num {
  syntax: "<integer>";
  initial-value: 0;
  inherits: false;
}
.cards {
  display: flex;
  gap: clamp(10px, 3vw, 18px);
}

.card {
  min-width: clamp(64px, 20vw, 88px);
  padding: clamp(10px, 3vw, 16px) clamp(8px, 2.4vw, 12px);
  border-radius: 16px;
  background: rgba(23, 20, 26, 0.08);
  text-align: center;
}
.card__num {
  --num: 0;
  counter-reset: num var(--num);
  display: block;
  font-weight: 800;
  font-size: clamp(20px, 6vw, 28px);
  line-height: 1;
  font-family: inherit;
  font-variant-numeric: tabular-nums;
  color: #17141a;
}
.card__num::before {
  content: counter(num);
}
.card__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.card__label {
  display: block;
  margin-top: 4px;
  font-weight: 600;
  font-size: clamp(10px, 3vw, 12px);
  line-height: 1;
  font-family: inherit;
  color: rgba(23, 20, 26, 0.72);
}

.cards.is-demo .card:nth-child(1) .card__num {
  animation: count-a 2s ease-out infinite;
}

.cards.is-demo .card:nth-child(2) .card__num {
  animation: count-b 2s ease-out infinite;
  animation-delay: 0.15s;
}

.cards.is-demo .card:nth-child(3) .card__num {
  animation: count-c 2s ease-out infinite;
  animation-delay: 0.3s;
}

@keyframes count-a {
  0% {
    --num: 0;
  }
  55% {
    --num: 356;
  }
  100% {
    --num: 356;
  }
}
@keyframes count-b {
  0% {
    --num: 0;
  }
  55% {
    --num: 82;
  }
  100% {
    --num: 82;
  }
}
@keyframes count-c {
  0% {
    --num: 0;
  }
  55% {
    --num: 5;
  }
  100% {
    --num: 5;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cards.is-demo .card:nth-child(1) .card__num {
    animation: none;
    --num: 356;
  }
  .cards.is-demo .card:nth-child(2) .card__num {
    animation: none;
    --num: 82;
  }
  .cards.is-demo .card:nth-child(3) .card__num {
    animation: none;
    --num: 5;
  }
}

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

export type Stat = { value: number; label: string };

export type StatCardsStaggerProps = {
  stats: [Stat, Stat, Stat];
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & {
  "--duration"?: string; "--easing"?: string; "--color"?: string;
  "--num-target"?: number; "--delay"?: string;
};

export default function StatCardsStagger({
  stats, duration = 2000, easing = "ease-out", color = "#17141a",
}: StatCardsStaggerProps) {
  return (
    <div className={styles.cards}>
      {stats.map((s, i) => {
        const vars: Vars = {
          "--duration": `${duration}ms`,
          "--easing": easing,
          "--color": color,
          "--num-target": s.value,
          "--delay": `${i * 150}ms`,                  // 카드마다 0.15초씩 늦게 시작
        };
        return (
          <div className={styles.card} key={s.label} style={vars}>
            <span className={styles.num} aria-hidden="true" />
            <span className={styles.sr}>{s.value.toLocaleString()}</span>
            <span className={styles.label}>{s.label}</span>
          </div>
        );
      })}
    </div>
  );
}