05Badge trượt vào

<main class="stage is-demo">
  <div class="panel">
    <span class="panel__bar panel__bar--lg" aria-hidden="true"></span>
    <span class="panel__bar panel__bar--sm" aria-hidden="true"></span>
    <span class="badge">NEW</span>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;   // 2s — 슬라이드 인·홀드·아웃 한 바퀴
$easing: $ease-pop;
$color: #62b29d;

@include stage($stage-ink);

.panel {
  box-sizing: border-box;
  position: relative;
  width: clamp(220px, 62vmin, 300px);
  padding: $sp-6;
  display: grid;
  gap: $sp-3;
}

.panel__bar { display: block; height: $sp-3; border-radius: $r-xs; background: rgba($subject-cream, .16); }
.panel__bar--lg { width: 78%; }
.panel__bar--sm { width: 52%; }

.badge {
  position: absolute;
  top: $sp-4;
  right: $sp-4;
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background: $color;
  color: $stage-ink;
  font-weight: 800;
  font-size: clamp(11px, 3vw, 12px);
  line-height: 1;
  font-family: inherit;
  letter-spacing: .04em;
  opacity: 0;
  transform: translateX($sp-10);
}

// 정지 구간(30%~65%)을 넣어 논스톱 슬라이드가 아니라 들어왔다 머물다 나가는 것처럼 보이게 한다
.stage.is-demo .badge { animation: slide-in $duration $easing infinite; }

@keyframes slide-in {
  0%   { opacity: 0; transform: translateX($sp-10); }
  30%  { opacity: 1; transform: translateX(0); }
  65%  { opacity: 1; transform: translateX(0); }
  100% { opacity: 0; transform: translateX($sp-10); }
}

@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .badge { animation: none; opacity: 1; transform: none; }
}

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);
}

.panel {
  box-sizing: border-box;
  position: relative;
  width: clamp(220px, 62vmin, 300px);
  padding: 24px;
  display: grid;
  gap: 12px;
}

.panel__bar {
  display: block;
  height: 12px;
  border-radius: 4px;
  background: rgba(255, 247, 230, 0.16);
}

.panel__bar--lg {
  width: 78%;
}

.panel__bar--sm {
  width: 52%;
}

.badge {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  border-radius: 999px;
  background: #62b29d;
  color: #17141a;
  font-weight: 800;
  font-size: clamp(11px, 3vw, 12px);
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
  opacity: 0;
  transform: translateX(40px);
}

.stage.is-demo .badge {
  animation: slide-in 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes slide-in {
  0% {
    opacity: 0;
    transform: translateX(40px);
  }
  30% {
    opacity: 1;
    transform: translateX(0);
  }
  65% {
    opacity: 1;
    transform: translateX(0);
  }
  100% {
    opacity: 0;
    transform: translateX(40px);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .badge {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

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

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

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

export default function BadgeSlideIn({
  label = "NEW",
  duration = 2000,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#06d6a0",
}: BadgeSlideInProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <div className={styles.panel} style={vars}>
      <span className={`${styles.bar} ${styles.barLg}`} aria-hidden="true" />
      <span className={`${styles.bar} ${styles.barSm}`} aria-hidden="true" />
      <span className={styles.badge}>{label}</span>
    </div>
  );
}