07Count-up number

<main class="stage">
  <div class="cu-box is-demo" role="status">
    <span class="cu-sr-only">Loading</span>
    <div class="cu-ring" aria-hidden="true"></div>
    <span class="cu-num" aria-hidden="true"></span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 2s;
$easing: linear;
$color: $subject-cream;

@include stage($stage-orange);

// 숫자 변수를 등록해야 애니메이션과 counter() 로 쓸 수 있다 (JS 없음)
@property --n {
  syntax: "<integer>";
  inherits: true;
  initial-value: 0;
}

.cu-box {
  position: relative;
  width: 170px;
  height: 170px;
  display: grid;
  place-items: center;
  --n: 0;
}

.cu-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.cu-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient($color calc(var(--n) * 1%), rgba(23, 20, 26, .45) 0);
  mask: radial-gradient(farthest-side, #0000 calc(100% - 20px), #000 calc(100% - 19px));
}

.cu-num {
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 56px;
  font-weight: 800;
  line-height: 1;
  color: $color;
  counter-reset: n var(--n);
}
.cu-num::after {
  content: counter(n) "%";
}

// 실사용: 로딩 중에만 .is-loading — 숫자와 링이 같은 변수를 읽어 정확히 맞물린다
.cu-box.is-loading,
.cu-box.is-demo {
  animation: cu-count $duration $easing infinite;
}

@keyframes cu-count {
  from { --n: 0; }
  to   { --n: 100; }
}

@media (prefers-reduced-motion: reduce) {
  .cu-box.is-loading,
  .cu-box.is-demo {
    animation: none !important;
    --n: 100 !important;   // 100% 에 멈춘 모양
  }
}

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);
}

@property --n {
  syntax: "<integer>";
  inherits: true;
  initial-value: 0;
}
.cu-box {
  position: relative;
  width: 170px;
  height: 170px;
  display: grid;
  place-items: center;
  --n: 0;
}

.cu-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.cu-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(#fff7e6 calc(var(--n) * 1%), rgba(23, 20, 26, 0.45) 0);
  mask: radial-gradient(farthest-side, rgba(0, 0, 0, 0) calc(100% - 20px), #000 calc(100% - 19px));
}

.cu-num {
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 56px;
  font-weight: 800;
  line-height: 1;
  color: #fff7e6;
  counter-reset: n var(--n);
}

.cu-num::after {
  content: counter(n) "%";
}

.cu-box.is-loading,
.cu-box.is-demo {
  animation: cu-count 2s linear infinite;
}

@keyframes cu-count {
  from {
    --n: 0;
  }
  to {
    --n: 100;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cu-box.is-loading,
  .cu-box.is-demo {
    animation: none !important;
    --n: 100 !important;
  }
}

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

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

export interface CountUpNumberProps {
  duration?: string;
  easing?: string;
  color?: string;
  /** 화면에 표시할 짧은 안내 문구 (스크린리더용) */
  label?: string;
}

export default function CountUpNumber({
  duration = "2s",
  easing = "linear",
  color = "#fff7e6",
  label = "Loading",
}: CountUpNumberProps) {
  const style: Vars = {
    "--duration": duration,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.box} style={style} role="status">
      <span className={styles.srOnly}>{label}</span>
      <div className={styles.ring} aria-hidden="true" />
      <span className={styles.num} aria-hidden="true" />
    </div>
  );
}