07Percent label sync

<main class="stage">
  <div class="track is-demo" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="76" aria-label="Survey progress">
    <div class="bar"></div>
    <div class="bubble"><span class="bubble__num" aria-hidden="true"></span></div>
  </div>
  <p class="cap">Survey progress</p>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-blue;                            // 바·말풍선 공통 색

@include stage($stage-paper);

// 정수로 등록해야 counter() 가 자릿수를 깔끔하게 읽는다. 자식(bar·bubble)이 같이 읽으므로 inherits: true
@property --percent {
  syntax: "<integer>";
  inherits: true;
  initial-value: 0;
}

.track {
  --percent: 0;
  position: relative;
  width: clamp(220px, 62vw, 280px);
  height: 20px;
  margin-top: 26px;
  border-radius: $r-pill;
  background: rgba(23, 20, 26, .1);
  container-type: inline-size;                    // 말풍선이 이 폭을 기준으로 움직인다
}
.bar {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: $color;
  transform: scaleX(calc(var(--percent) / 100));
  transform-origin: left center; // 규칙8: 좌변서 차오름
}
// 링이 아니라 막대 위에서, 채움의 끝자락을 translateX(cqw) 로 따라간다 — 1cqw = 컨테이너 폭의 1%
.bubble {
  position: absolute;
  top: -30px;
  left: 0;
  transform: translateX(calc(var(--percent) * 1cqw - 50%));
  background: $subject-ink;
  color: #fff;
  border-radius: $r-control;
  padding: 3px 9px;
  font: 700 clamp(11px, 3vw, 13px)/1.6 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}
.bubble__num {
  counter-reset: p var(--percent);
  &::before { content: counter(p) "%"; }
}
.track.is-demo { animation: fill $duration $easing infinite; }

@keyframes fill { 0% { --percent: 0; } 60% { --percent: 76; } 100% { --percent: 76; } }

.cap {
  margin: 34px 0 0;
  color: $subject-ink;
  font: 600 clamp(12px, 3.2vw, 14px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

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

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

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

@property --percent {
  syntax: "<integer>";
  inherits: true;
  initial-value: 0;
}
.track {
  --percent: 0;
  position: relative;
  width: clamp(220px, 62vw, 280px);
  height: 20px;
  margin-top: 26px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.1);
  container-type: inline-size;
}

.bar {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: #2f6df6;
  transform: scaleX(calc(var(--percent) / 100));
  transform-origin: left center;
}

.bubble {
  position: absolute;
  top: -30px;
  left: 0;
  transform: translateX(calc(var(--percent) * 1cqw - 50%));
  background: #17141a;
  color: #fff;
  border-radius: 12px;
  padding: 3px 9px;
  font: 700 clamp(11px, 3vw, 13px)/1.6 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.bubble__num {
  counter-reset: p var(--percent);
}
.bubble__num::before {
  content: counter(p) "%";
}

.track.is-demo {
  animation: fill 2s ease-out infinite;
}

@keyframes fill {
  0% {
    --percent: 0;
  }
  60% {
    --percent: 76;
  }
  100% {
    --percent: 76;
  }
}
.cap {
  margin: 34px 0 0;
  color: #17141a;
  font: 600 clamp(12px, 3.2vw, 14px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

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

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

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

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

export default function PercentLabel({
  percent,
  duration = 600,
  easing = "ease-out",
  color = "#2f6df6",
  label,
}: PercentLabelProps) {
  const p = Math.max(0, Math.min(100, percent));
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color, "--percent": p };

  return (
    <div
      className={styles.track}
      style={vars}
      role="progressbar"
      aria-valuemin={0}
      aria-valuemax={100}
      aria-valuenow={p}
      aria-label={label}
    >
      <div className={styles.bar} />
      <div className={styles.bubble}>{Math.round(p)}%</div>
    </div>
  );
}