05Thanh chia đoạn theo bậc

<main class="stage">
  <div class="segs is-demo" role="progressbar" aria-valuemin="0" aria-valuemax="5" aria-valuenow="3" aria-label="Tín hiệu">
    <span class="seg"></span><span class="seg"></span><span class="seg"></span><span class="seg"></span><span class="seg"></span>
  </div>
  <p class="cap">Tín hiệu</p>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 260ms;                                 // 조각 하나가 켜지는 시간
$easing: $ease-pop;
$color: $subject-cream;                           // 켜진 조각 색

@include stage($stage-ink);

.segs {
  display: flex;
  align-items: flex-end;
  gap: 6px;
}
.seg {
  width: 16px;
  height: 46px;
  border-radius: 4px;
  background: rgba(255, 255, 255, .14);
  opacity: .35;
  transform: scaleY(.7);
  transform-origin: bottom; // 규칙8: 아래서 차오름
}
// 조각마다 시작 시점을 다르게 — 하나로 이어진 바가 아니라 순서대로 켜지는 신호처럼
.segs.is-demo .seg { animation: light 2s $easing infinite; }
.segs.is-demo .seg:nth-child(1) { animation-delay: 0ms; }
.segs.is-demo .seg:nth-child(2) { animation-delay: 160ms; }
.segs.is-demo .seg:nth-child(3) { animation-delay: 320ms; }
.segs.is-demo .seg:nth-child(4) { animation-delay: 480ms; }
.segs.is-demo .seg:nth-child(5) { animation-delay: 640ms; }

@keyframes light {
  0%, 60%, 100% { opacity: .35; transform: scaleY(.7); background: rgba(255, 255, 255, .14); }
  20%, 45%      { opacity: 1;   transform: scaleY(1);  background: $color; }
}

.cap {
  margin: 14px 0 0;
  color: rgba(255, 255, 255, .7);
  font: 600 clamp(12px, 3.2vw, 14px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .segs.is-demo .seg { animation: none; opacity: 1; transform: scaleY(1); background: $color; }
}

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);
}

.segs {
  display: flex;
  align-items: flex-end;
  gap: 6px;
}

.seg {
  width: 16px;
  height: 46px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.14);
  opacity: 0.35;
  transform: scaleY(0.7);
  transform-origin: bottom;
}

.segs.is-demo .seg {
  animation: light 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

.segs.is-demo .seg:nth-child(1) {
  animation-delay: 0ms;
}

.segs.is-demo .seg:nth-child(2) {
  animation-delay: 160ms;
}

.segs.is-demo .seg:nth-child(3) {
  animation-delay: 320ms;
}

.segs.is-demo .seg:nth-child(4) {
  animation-delay: 480ms;
}

.segs.is-demo .seg:nth-child(5) {
  animation-delay: 640ms;
}

@keyframes light {
  0%, 60%, 100% {
    opacity: 0.35;
    transform: scaleY(0.7);
    background: rgba(255, 255, 255, 0.14);
  }
  20%, 45% {
    opacity: 1;
    transform: scaleY(1);
    background: #fff7e6;
  }
}
.cap {
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.7);
  font: 600 clamp(12px, 3.2vw, 14px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .segs.is-demo .seg {
    animation: none;
    opacity: 1;
    transform: scaleY(1);
    background: #fff7e6;
  }
}

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

export type SegmentedStepsProps = {
  /** 켜진 조각 수 (0~total) */
  active: number;
  total?: number;
  duration?: number;
  easing?: string;
  color?: string;
  label?: string;
};

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

export default function SegmentedSteps({
  active,
  total = 5,
  duration = 220,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#fff7e6",
  label,
}: SegmentedStepsProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <div
      className={styles.segs}
      style={vars}
      role="progressbar"
      aria-valuemin={0}
      aria-valuemax={total}
      aria-valuenow={active}
      aria-label={label}
    >
      {Array.from({ length: total }, (_, i) => (
        <span key={i} className={i < active ? `${styles.seg} ${styles.on}` : styles.seg} />
      ))}
    </div>
  );
}