05퍼센트 링과 숫자 동기화

<main class="stage">
  <div class="stat">
    <div class="ring is-demo">
      <span class="ring__num" aria-hidden="true"></span>
      <span class="ring__sr">76%</span>
    </div>
    <span class="stat__label">달성률</span>
  </div>
</main>

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

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

@include stage($stage-ink);

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(8px, 2.4vw, 12px);
}

// 정수 하나(--p)가 링의 채움 각도와 숫자 텍스트를 동시에 구동한다
@property --p {
  syntax: '<integer>';
  initial-value: 0;
  inherits: true;                                    // 자식 .ring__num 이 같은 값을 counter-reset 으로 읽는다
}

.ring {
  --p: 0;
  position: relative;
  width: clamp(84px, 22vw, 108px);
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient($color calc(var(--p) * 1%), rgba(255, 255, 255, .16) 0);

  &::before {                                         // 도넛 구멍 — 무대 색과 같아 링처럼 보인다
    content: "";
    position: absolute;
    inset: 15%;
    border-radius: 50%;
    background: $stage-ink;
  }

  &__num {
    position: relative;
    counter-reset: p var(--p);
    font-weight: 800; font-size: clamp(16px, 5vw, 22px); line-height: 1; font-family: inherit;
    font-variant-numeric: tabular-nums;
    color: $color;

    &::before { content: counter(p) "%"; }
  }

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

.stat__label {
  font-weight: 600; font-size: clamp(12px, 3.4vw, 15px); line-height: 1; font-family: inherit;
  color: rgba(255, 255, 255, .6);
}

.ring.is-demo {
  animation: percent-up $duration $easing infinite;
}

@keyframes percent-up {
  0%   { --p: 0; }
  65%  { --p: 76; }
  100% { --p: 76; }
}

@media (prefers-reduced-motion: reduce) {
  .ring.is-demo { animation: none; --p: 76; }
}

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);
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(8px, 2.4vw, 12px);
}

@property --p {
  syntax: "<integer>";
  initial-value: 0;
  inherits: true;
}
.ring {
  --p: 0;
  position: relative;
  width: clamp(84px, 22vw, 108px);
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: conic-gradient(#fff7e6 calc(var(--p) * 1%), rgba(255, 255, 255, 0.16) 0);
}
.ring::before {
  content: "";
  position: absolute;
  inset: 15%;
  border-radius: 50%;
  background: #17141a;
}
.ring__num {
  position: relative;
  counter-reset: p var(--p);
  font-weight: 800;
  font-size: clamp(16px, 5vw, 22px);
  line-height: 1;
  font-family: inherit;
  font-variant-numeric: tabular-nums;
  color: #fff7e6;
}
.ring__num::before {
  content: counter(p) "%";
}
.ring__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.stat__label {
  font-weight: 600;
  font-size: clamp(12px, 3.4vw, 15px);
  line-height: 1;
  font-family: inherit;
  color: rgba(255, 255, 255, 0.6);
}

.ring.is-demo {
  animation: percent-up 2s ease-out infinite;
}

@keyframes percent-up {
  0% {
    --p: 0;
  }
  65% {
    --p: 76;
  }
  100% {
    --p: 76;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ring.is-demo {
    animation: none;
    --p: 76;
  }
}

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

export type PercentRingCounterProps = {
  /** 0~100 */
  percent: number;
  label: string;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function PercentRingCounter({
  percent, label, duration = 2000, easing = "ease-out", color = "#fff7e6",
}: PercentRingCounterProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
    "--p-target": percent,
  };

  return (
    <div className={styles.stat}>
      <div className={styles.ring} style={vars}>
        <span className={styles.num} aria-hidden="true" />
        <span className={styles.sr}>{percent}%</span>
      </div>
      <span className={styles.label}>{label}</span>
    </div>
  );
}