08Đồng bộ marker tiến trình

<main class="stage">
  <div class="pm is-demo">
    <input type="radio" name="pm-tab" id="pm-1" class="pm__radio" checked>
    <input type="radio" name="pm-tab" id="pm-2" class="pm__radio">
    <input type="radio" name="pm-tab" id="pm-3" class="pm__radio">
    <div class="pm__bar">
      <span class="pm__fill"></span>
      <label class="pm__seg" for="pm-1" aria-label="Chuyển tới slide 1"></label>
      <label class="pm__seg" for="pm-2" aria-label="Chuyển tới slide 2"></label>
      <label class="pm__seg" for="pm-3" aria-label="Chuyển tới slide 3"></label>
    </div>
    <div class="pm__viewport">
      <div class="pm__track">
        <div class="pm__slide pm__slide--1"><span class="pm__cap">01 · Câu chuyện thương hiệu</span></div>
        <div class="pm__slide pm__slide--2"><span class="pm__cap">02 · Bộ sưu tập mùa này</span></div>
        <div class="pm__slide pm__slide--3"><span class="pm__cap">03 · Thông tin cửa hàng</span></div>
        <div class="pm__slide pm__slide--1" aria-hidden="true"><span class="pm__cap">01 · Câu chuyện thương hiệu</span></div>
      </div>
    </div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-base;
$easing: $ease-out;
$color: $subject-blue;                // 진행 바 색

@include stage($stage-yellow);

.pm { width: min(360px, 84vw); }
.pm__radio { position: absolute; opacity: 0; pointer-events: none; }

.pm__bar {
  position: relative;
  display: flex;
  height: 4px;
  border-radius: $r-pill;
  background: rgba(23, 20, 26, .16);
  overflow: hidden;
  margin-bottom: $sp-3;
}
.pm__fill {
  position: absolute;
  left: 0; top: 0;
  display: block;
  height: 100%;
  width: calc(100% / 3);
  border-radius: $r-pill;
  background: $color;
  transition: width $duration $easing;
}
// 진행 바 위에 놓인 투명 클릭 영역 — 원하는 번호를 바로 누를 수 있다 (0줄 JS)
.pm__seg {
  position: relative;
  z-index: 1;
  flex: 1;
  cursor: pointer;
}
#pm-2:checked ~ .pm__bar .pm__fill { width: calc(200% / 3); }
#pm-3:checked ~ .pm__bar .pm__fill { width: 100%; }

// ── 실제 동작: 트랙이 :checked 만으로 한 칸씩 옮겨가고, 진행 바는 같은 신호로 채워진다 ──
// 트랙 끝에는 1번의 복제본(aria-hidden)이 한 장 더 — 예고편 루프가 그곳까지 가고 되돌아간다 (텔레포트 금지)
.pm__viewport { overflow: hidden; border-radius: $r-card; }
.pm__track {
  display: flex;
  width: 400%;
  transform: translateX(0%);
  transition: transform $duration $easing;
}
#pm-2:checked ~ .pm__viewport .pm__track { transform: translateX(calc(-25% - #{$sp-3})); }
#pm-3:checked ~ .pm__viewport .pm__track { transform: translateX(calc(-50% - #{$sp-3 * 2})); }

.pm__slide {
  flex: 0 0 25%;
  aspect-ratio: 16 / 9;
  margin-right: $sp-3;
  border-radius: $r-card;
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: end start;
  box-sizing: border-box;
}
.pm__slide:last-child { margin-right: 0; }
.pm__slide::before {
  content: ""; position: absolute; top: $sp-4; right: $sp-4;
  width: $sp-8; height: $sp-8; border-radius: 50%;
  background: rgba(255, 255, 255, .85);
}
.pm__slide::after {
  content: ""; position: absolute; left: -8%; right: -8%; bottom: -6%; height: 48%;
  background: rgba(23, 20, 26, .24);
  clip-path: polygon(0% 100%, 20% 40%, 40% 66%, 58% 26%, 76% 60%, 100% 34%, 100% 100%);
}
.pm__slide--1 { background: linear-gradient(135deg, $color, #d6ddeb); }
.pm__slide--2 { background: linear-gradient(135deg, $stage-orange, #ebdbd6); }
.pm__slide--3 { background: linear-gradient(135deg, $subject-ink, #4a3f5c); }
.pm__cap {
  position: relative; z-index: 1;
  margin: $sp-3;
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background: rgba(23, 20, 26, .38);
  color: $subject-cream;
  font-weight: 600;
  font-size: clamp(11px, 3vw, 13px);
  line-height: 1;
  font-family: inherit;
}

// ── 데모 루프: 클릭 전까지 진행 바와 트랙이 같은 박자로 스스로 넘어간다 ──
// 트랙의 마지막 칸은 1번의 복제본 — 100%→0% 점프가 안 보인다.
// 진행 바는 한 바퀴가 끝나면 100%→1/3 로 부드럽게 빠져 돌아간다(스토리 프로그레스 링과 같은 리셋)
.pm.is-demo .pm__track { animation: pm-track $dur-loop $easing infinite; }
.pm.is-demo .pm__fill { animation: pm-fill $dur-loop $easing infinite; }
@keyframes pm-track {
  0%, 8%    { transform: translateX(0%); }
  31%, 39%  { transform: translateX(calc(-25% - #{$sp-3})); }
  62%, 70%  { transform: translateX(calc(-50% - #{$sp-3 * 2})); }
  92%, 100% { transform: translateX(calc(-75% - #{$sp-3 * 3})); }
}
@keyframes pm-fill {
  0%, 8%    { width: calc(100% / 3); }
  31%, 39%  { width: calc(200% / 3); }
  62%, 66%  { width: 100%; }
  88%, 100% { width: calc(100% / 3); }
}

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .pm__track, .pm__fill { transition: none; }
  .pm.is-demo .pm__track, .pm.is-demo .pm__fill { animation: none !important; }
}

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);
}

.pm {
  width: min(360px, 84vw);
}

.pm__radio {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.pm__bar {
  position: relative;
  display: flex;
  height: 4px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.16);
  overflow: hidden;
  margin-bottom: 12px;
}

.pm__fill {
  position: absolute;
  left: 0;
  top: 0;
  display: block;
  height: 100%;
  width: 33.3333333333%;
  border-radius: 999px;
  background: #2f6df6;
  transition: width 300ms ease-out;
}

.pm__seg {
  position: relative;
  z-index: 1;
  flex: 1;
  cursor: pointer;
}

#pm-2:checked ~ .pm__bar .pm__fill {
  width: 66.6666666667%;
}

#pm-3:checked ~ .pm__bar .pm__fill {
  width: 100%;
}

.pm__viewport {
  overflow: hidden;
  border-radius: 16px;
}

.pm__track {
  display: flex;
  width: 400%;
  transform: translateX(0%);
  transition: transform 300ms ease-out;
}

#pm-2:checked ~ .pm__viewport .pm__track {
  transform: translateX(calc(-25% - 12px));
}

#pm-3:checked ~ .pm__viewport .pm__track {
  transform: translateX(calc(-50% - 24px));
}

.pm__slide {
  flex: 0 0 25%;
  aspect-ratio: 16/9;
  margin-right: 12px;
  border-radius: 16px;
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: end start;
  box-sizing: border-box;
}

.pm__slide:last-child {
  margin-right: 0;
}

.pm__slide::before {
  content: "";
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.85);
}

.pm__slide::after {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: -6%;
  height: 48%;
  background: rgba(23, 20, 26, 0.24);
  clip-path: polygon(0% 100%, 20% 40%, 40% 66%, 58% 26%, 76% 60%, 100% 34%, 100% 100%);
}

.pm__slide--1 {
  background: linear-gradient(135deg, #2f6df6, #d6ddeb);
}

.pm__slide--2 {
  background: linear-gradient(135deg, #ff4d1f, #ebdbd6);
}

.pm__slide--3 {
  background: linear-gradient(135deg, #17141a, #4a3f5c);
}

.pm__cap {
  position: relative;
  z-index: 1;
  margin: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.38);
  color: #fff7e6;
  font-weight: 600;
  font-size: clamp(11px, 3vw, 13px);
  line-height: 1;
  font-family: inherit;
}

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

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

@keyframes pm-track {
  0%, 8% {
    transform: translateX(0%);
  }
  31%, 39% {
    transform: translateX(calc(-25% - 12px));
  }
  62%, 70% {
    transform: translateX(calc(-50% - 24px));
  }
  92%, 100% {
    transform: translateX(calc(-75% - 36px));
  }
}
@keyframes pm-fill {
  0%, 8% {
    width: 33.3333333333%;
  }
  31%, 39% {
    width: 66.6666666667%;
  }
  62%, 66% {
    width: 100%;
  }
  88%, 100% {
    width: 33.3333333333%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .pm__track, .pm__fill {
    transition: none;
  }
  .pm.is-demo .pm__track, .pm.is-demo .pm__fill {
    animation: none !important;
  }
}

// 실제 동작은 :checked 만으로 끝난다(0줄). 이 3줄은 미리보기 자동 재생만 멈춘다.
document.querySelectorAll('.pm__radio').forEach(function (r) {
  r.addEventListener('pointerdown', function () { document.querySelector('.pm').classList.remove('is-demo'); });
});

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

const SLIDES = ["01 · 브랜드 소개", "02 · 이번 시즌 컬렉션", "03 · 매장 안내"];

export type ProgressMarkerProps = {
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function ProgressMarker({ duration = 300, easing = "ease-out", color = "#2f6df6" }: ProgressMarkerProps) {
  const [active, setActive] = useState(0);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color, "--i": active };
  return (
    <div className={styles.pm} style={vars}>
      <div className={styles.bar}>
        <span className={styles.fill} style={{ width: `${((active + 1) / SLIDES.length) * 100}%` }} />
        {SLIDES.map((label, i) => (
          <button key={label} type="button" aria-label={`${i + 1}번으로 이동`} className={styles.seg} onClick={() => setActive(i)} />
        ))}
      </div>
      <div className={styles.viewport}>
        <div className={styles.track} style={{ transform: `translateX(calc(${-active * 100}% / ${SLIDES.length}))` }}>
          {SLIDES.map((label, i) => (
            <button key={label} type="button" className={styles.slide} onClick={() => setActive(i)}>
              <span className={styles.cap}>{label}</span>
            </button>
          ))}
        </div>
      </div>
    </div>
  );
}