08Sự kiện hiện dần bằng view()

<main class="stage">
  <div class="ts08-box">
    <div class="ts08-card is-demo">09:00</div>
    <div class="ts08-card is-demo">09:20</div>
    <div class="ts08-card is-demo">10:00</div>
    <div class="ts08-card is-demo">10:40</div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-blue-deep;   // 크림 글자가 얹히므로 진한 파랑

@include stage($stage-paper);

.ts08-box {
  width: min(240px, 84vw);
  height: clamp(120px, 66vh, 220px);
  overflow-y: auto;
  padding: $sp-2;
  box-sizing: border-box;
  background: rgba(23, 20, 26, .05);
  border-radius: $r-sm;
}

.ts08-card {
  padding: $sp-4;
  margin-bottom: $sp-2;
  border-radius: $r-sm;
  background: $color;
  color: $subject-cream;
  font: 700 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  opacity: 0;
  transform: translateY(16px);
  &:last-of-type { margin-bottom: 0; }
}

// 실제 사용 코드: 카드마다 자기가 스크롤로 보이는 구간에 맞춰 자동으로 드러난다
@supports (animation-timeline: view()) {
  .ts08-card:not(.is-demo) {
    animation: ts08-reveal $easing both;
    animation-timeline: view();
    animation-range: entry 0% cover 40%;
  }
}
// 미지원 브라우저(Firefox·Safari): 다 드러난 최종 상태로 고정
@supports not (animation-timeline: view()) {
  .ts08-card:not(.is-demo) { opacity: 1; transform: none; }
}

@keyframes ts08-reveal { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }

// 데모 루프: 실제 스크롤 대신, 카드가 하나씩 드러나는 걸 순서대로 흉내(캡처용)
.ts08-card.is-demo { animation: ts08-reveal-loop $duration $easing infinite; }
.ts08-card.is-demo:nth-child(1) { animation-delay: 0ms; }
.ts08-card.is-demo:nth-child(2) { animation-delay: 220ms; }
.ts08-card.is-demo:nth-child(3) { animation-delay: 440ms; }
.ts08-card.is-demo:nth-child(4) { animation-delay: 660ms; }

@keyframes ts08-reveal-loop {
  0%   { opacity: 0; transform: translateY(16px); }
  18%  { opacity: 1; transform: translateY(0); }
  85%  { opacity: 1; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(16px); }
}

@media (prefers-reduced-motion: reduce) {
  .ts08-card, .ts08-card.is-demo { animation: none !important; opacity: 1 !important; transform: none !important; }
}

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);
}

.ts08-box {
  width: min(240px, 84vw);
  height: clamp(120px, 66vh, 220px);
  overflow-y: auto;
  padding: 8px;
  box-sizing: border-box;
  background: rgba(23, 20, 26, 0.05);
  border-radius: 8px;
}

.ts08-card {
  padding: 16px;
  margin-bottom: 8px;
  border-radius: 8px;
  background: #0a4fe8;
  color: #fff7e6;
  font: 700 13px/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  opacity: 0;
  transform: translateY(16px);
}
.ts08-card:last-of-type {
  margin-bottom: 0;
}

@supports (animation-timeline: view()) {
  .ts08-card:not(.is-demo) {
    animation: ts08-reveal ease-out both;
    animation-timeline: view();
    animation-range: entry 0% cover 40%;
  }
}
@supports not (animation-timeline: view()) {
  .ts08-card:not(.is-demo) {
    opacity: 1;
    transform: none;
  }
}
@keyframes ts08-reveal {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
.ts08-card.is-demo {
  animation: ts08-reveal-loop 2s ease-out infinite;
}

.ts08-card.is-demo:nth-child(1) {
  animation-delay: 0ms;
}

.ts08-card.is-demo:nth-child(2) {
  animation-delay: 220ms;
}

.ts08-card.is-demo:nth-child(3) {
  animation-delay: 440ms;
}

.ts08-card.is-demo:nth-child(4) {
  animation-delay: 660ms;
}

@keyframes ts08-reveal-loop {
  0% {
    opacity: 0;
    transform: translateY(16px);
  }
  18% {
    opacity: 1;
    transform: translateY(0);
  }
  85% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(16px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .ts08-card, .ts08-card.is-demo {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

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

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

export interface ViewRevealEventsProps {
  color?: string;
  times?: string[];
}

// animation-timeline: view() 도 scroll() 과 같은 지원 범위다 — IntersectionObserver 없이
// 카드마다 자기가 뷰포트에 들어오는 구간에서 opacity·translateY 가 자동으로 움직인다.
export default function ViewRevealEvents({
  color = "#0a4fe8",
  times = ["09:00", "09:20", "10:00", "10:40"],
}: ViewRevealEventsProps) {
  const style: Vars = { "--color": color };
  return (
    <div className={styles.box} style={style}>
      {times.map((t) => (
        <div key={t} className={styles.card}>{t}</div>
      ))}
    </div>
  );
}