07Feature checks stagger in

<main class="stage">
  <div class="fc-card is-demo">
    <span class="fc-card__tag">Pro plan</span>
    <ul class="fc-list">
      <li class="fc-row"><span class="fc-check"></span>Unlimited projects</li>
      <li class="fc-row"><span class="fc-check"></span>Priority support</li>
      <li class="fc-row"><span class="fc-check"></span>Custom domain</li>
    </ul>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 320ms;
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-orange);

.fc-card {
  width: min(260px, 84vw);
  box-sizing: border-box;
  border-radius: $r-card;
  padding: $sp-5;
  background: rgba(23, 20, 26, .55);
  display: flex;
  flex-direction: column;
  gap: $sp-3;
}
.fc-card__tag {
  color: $subject-cream;
  opacity: .8;
  font: 600 12px/1 -apple-system, "Segoe UI", sans-serif;
}

.fc-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: $sp-2; }
.fc-row {
  display: flex;
  align-items: center;
  gap: $sp-2;
  color: $subject-cream;
  font: 500 12px/1 -apple-system, "Segoe UI", sans-serif;
  opacity: 0;
  transform: translateX(-#{$sp-3});
  transition: opacity $duration $easing, transform $duration $easing;
}

// 체크 아이콘 — 한 요소를 border-right+border-bottom 으로 L자로 그린 뒤 45deg 회전 (두 막대 방식보다 안전, BD16)
.fc-check {
  flex: 0 0 auto;
  width: 6px;
  height: 10px;
  border-right: 2px solid $color;
  border-bottom: 2px solid $color;
  transform: rotate(45deg);
  margin-left: $sp-1;
}

// 실사용: 카드에 마우스를 올리면 체크 목록이 위에서부터 시차를 두고 나타난다
.fc-card:hover .fc-row { opacity: 1; transform: none; }
.fc-card:hover .fc-row:nth-child(2) { transition-delay: 120ms; }
.fc-card:hover .fc-row:nth-child(3) { transition-delay: 240ms; }

// 데모 루프: is-demo 는 같은 등장을 keyframes 로 반복 재생 (캡처용)
@keyframes fc-in {
  0% { opacity: 0; transform: translateX(-#{$sp-3}); }
  20%, 85% { opacity: 1; transform: none; }
  100% { opacity: 0; transform: translateX(-#{$sp-3}); }
}
.fc-card.is-demo .fc-row { animation: fc-in $dur-loop $easing infinite; }
.fc-card.is-demo .fc-row:nth-child(2) { animation-delay: 140ms; }
.fc-card.is-demo .fc-row:nth-child(3) { animation-delay: 280ms; }

@media (prefers-reduced-motion: reduce) {
  .fc-row,
  .fc-card.is-demo .fc-row { animation: none !important; transition: 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: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.fc-card {
  width: min(260px, 84vw);
  box-sizing: border-box;
  border-radius: 16px;
  padding: 20px;
  background: rgba(23, 20, 26, 0.55);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.fc-card__tag {
  color: #fff7e6;
  opacity: 0.8;
  font: 600 12px/1 -apple-system, "Segoe UI", sans-serif;
}

.fc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.fc-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff7e6;
  font: 500 12px/1 -apple-system, "Segoe UI", sans-serif;
  opacity: 0;
  transform: translateX(-12px);
  transition: opacity 320ms ease-out, transform 320ms ease-out;
}

.fc-check {
  flex: 0 0 auto;
  width: 6px;
  height: 10px;
  border-right: 2px solid #2f6df6;
  border-bottom: 2px solid #2f6df6;
  transform: rotate(45deg);
  margin-left: 4px;
}

.fc-card:hover .fc-row {
  opacity: 1;
  transform: none;
}

.fc-card:hover .fc-row:nth-child(2) {
  transition-delay: 120ms;
}

.fc-card:hover .fc-row:nth-child(3) {
  transition-delay: 240ms;
}

@keyframes fc-in {
  0% {
    opacity: 0;
    transform: translateX(-12px);
  }
  20%, 85% {
    opacity: 1;
    transform: none;
  }
  100% {
    opacity: 0;
    transform: translateX(-12px);
  }
}
.fc-card.is-demo .fc-row {
  animation: fc-in 2s ease-out infinite;
}

.fc-card.is-demo .fc-row:nth-child(2) {
  animation-delay: 140ms;
}

.fc-card.is-demo .fc-row:nth-child(3) {
  animation-delay: 280ms;
}

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

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

export interface FeatureCheckStaggerProps {
  duration?: string;
  easing?: string;
  features?: string[];
}

export default function FeatureCheckStagger({
  duration = "320ms",
  easing = "ease-out",
  features = ["Unlimited projects", "Priority support", "Custom domain"],
}: FeatureCheckStaggerProps) {
  const style = { "--duration": duration, "--easing": easing } as CSSProperties;
  return (
    <div className={styles.card} style={style}>
      <span className={styles.tag}>Pro plan</span>
      <ul className={styles.list}>
        {features.map((f) => (
          <li key={f} className={styles.row}>
            <span className={styles.check} />{f}
          </li>
        ))}
      </ul>
    </div>
  );
}