07Skeleton to content

<main class="stage">
  <div class="card">
    <div class="skeleton">
      <div class="bar b1"></div>
      <div class="bar b2"></div>
      <div class="bar b3"></div>
    </div>
    <div class="content">
      <p class="t1">Skeleton bars turn into real content</p>
      <p class="t2">with a smooth crossfade.</p>
    </div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;                            // 막대 ↔ 내용 한 바퀴
$easing: $ease-out;
$color: $subject-cream;                          // 내용 글자·막대 색 (주황 무대라 크림)

@include stage($stage-orange);

.card {
  width: clamp(200px, 74%, 320px);
  display: grid;                                 // 두 레이어를 같은 칸에 겹친다
}

.skeleton, .content {
  grid-area: 1 / 1;
  display: grid;
  gap: clamp(8px, 2.6vw, 10px);
  align-content: center;
}

// ── 막대: 튀지 않게 페이드만 ──────────────────────────
.skeleton {
  animation: fade-out $duration $easing infinite;
}
.bar { height: clamp(11px, 3.4vw, 14px); border-radius: $r-control; background: rgba($color, .35); }
.bar.b1 { width: 90%; }
.bar.b2 { width: 70%; }
.bar.b3 { width: 50%; }

@keyframes fade-out {
  0%, 40%   { opacity: 1; }
  55%, 85%  { opacity: 0; }
  100%      { opacity: 1; }
}

// ── 내용: 페이드 + 위로 살짝 (300ms) ───────────────────
.content {
  color: $color;
  font: 600 clamp(13px, 3.6vw, 16px)/1.4 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  animation: fade-in $duration $easing infinite;
}
.content p { margin: 0; }

@keyframes fade-in {
  0%, 40%   { opacity: 0; transform: translateY(6px); }
  55%, 85%  { opacity: 1; transform: translateY(0); }
  100%      { opacity: 0; transform: translateY(6px); }
}

// ── 접근성: 전환 반복을 멈추고 내용이 보이는 상태로 고정 ──────
@media (prefers-reduced-motion: reduce) {
  .skeleton { display: none; }
  .content { animation: none !important; opacity: 1; transform: translateY(0); }
}

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);
}

.card {
  width: clamp(200px, 74%, 320px);
  display: grid;
}

.skeleton, .content {
  grid-area: 1/1;
  display: grid;
  gap: clamp(8px, 2.6vw, 10px);
  align-content: center;
}

.skeleton {
  animation: fade-out 2s ease-out infinite;
}

.bar {
  height: clamp(11px, 3.4vw, 14px);
  border-radius: 12px;
  background: rgba(255, 247, 230, 0.35);
}

.bar.b1 {
  width: 90%;
}

.bar.b2 {
  width: 70%;
}

.bar.b3 {
  width: 50%;
}

@keyframes fade-out {
  0%, 40% {
    opacity: 1;
  }
  55%, 85% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
.content {
  color: #fff7e6;
  font: 600 clamp(13px, 3.6vw, 16px)/1.4 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  animation: fade-in 2s ease-out infinite;
}

.content p {
  margin: 0;
}

@keyframes fade-in {
  0%, 40% {
    opacity: 0;
    transform: translateY(6px);
  }
  55%, 85% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(6px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .skeleton {
    display: none;
  }
  .content {
    animation: none !important;
    opacity: 1;
    transform: translateY(0);
  }
}

import type { CSSProperties, ReactNode } from "react";
import styles from "./SkeletonToContent.module.scss";

export type SkeletonToContentProps = {
  loading: boolean;
  children: ReactNode;
  /** 막대 ↔ 내용 전환 시간 (기본 300ms) */
  duration?: number;
  easing?: string;
  color?: string;
  className?: string;
};

export default function SkeletonToContent({
  loading,
  children,
  duration = 300,
  easing = "ease-out",
  color = "#fff7e6",
  className = "",
}: SkeletonToContentProps) {
  const vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color } as CSSProperties;
  return (
    <div className={`${styles.card} ${className}`} style={vars} aria-busy={loading}>
      <div className={`${styles.skeleton} ${loading ? "" : styles.hide}`} aria-hidden={!loading}>
        <div className={styles.bar} style={{ width: "90%" } as CSSProperties} />
        <div className={styles.bar} style={{ width: "70%" } as CSSProperties} />
        <div className={styles.bar} style={{ width: "50%" } as CSSProperties} />
      </div>
      <div className={`${styles.content} ${loading ? styles.hide : ""}`}>{children}</div>
    </div>
  );
}