01List cascade

<main class="stage">
  <ul class="cascade is-demo">
    <li>New message</li>
    <li>Payment complete</li>
    <li>Points earned</li>
  </ul>
</main>

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

$duration: $dur-base;                              // 항목 하나가 나타나는 시간
$easing: $ease-pop;                                // 톡 튀어 올라오는 느낌
$stagger: 90ms;                                    // 항목 사이 시차

@include stage($stage-ink);

.cascade {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: min(400px, 90vw);
  font-weight: 600; font-size: clamp(12px, 3.4vw, 15px); line-height: 1.2; font-family: inherit;

  li {
    padding: clamp(8px, 2.6vw, 11px) clamp(12px, 3.4vw, 16px);
    border-radius: $r-pill;
    background: $subject-cream;
    color: $stage-ink;
    box-shadow: $shadow-raised;
    animation: cascade-loop $dur-loop $easing infinite;
    white-space: nowrap;
  }

  @for $i from 1 through 3 {
    li:nth-child(#{$i}) { animation-delay: ($i - 1) * $stagger; }
  }
}

@keyframes cascade-loop {
  0%, 8%    { opacity: 0; transform: translateY(14px) scale(.9); }
  26%, 66%  { opacity: 1; transform: translateY(0) scale(1); }
  86%, 100% { opacity: 0; transform: translateY(-8px) scale(.96); }
}

@media (prefers-reduced-motion: reduce) {
  .cascade li { 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);
}

.cascade {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: min(400px, 90vw);
  font-weight: 600;
  font-size: clamp(12px, 3.4vw, 15px);
  line-height: 1.2;
  font-family: inherit;
}
.cascade li {
  padding: clamp(8px, 2.6vw, 11px) clamp(12px, 3.4vw, 16px);
  border-radius: 999px;
  background: #fff7e6;
  color: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  animation: cascade-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
  white-space: nowrap;
}
.cascade li:nth-child(1) {
  animation-delay: 0ms;
}
.cascade li:nth-child(2) {
  animation-delay: 90ms;
}
.cascade li:nth-child(3) {
  animation-delay: 180ms;
}

@keyframes cascade-loop {
  0%, 8% {
    opacity: 0;
    transform: translateY(14px) scale(0.9);
  }
  26%, 66% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  86%, 100% {
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
  }
}
@media (prefers-reduced-motion: reduce) {
  .cascade li {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

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

export type ListCascadeProps = {
  items: string[];
  /** 항목 하나가 나타나는 시간 (기본 300ms) */
  duration?: number;
  easing?: string;
  /** 항목 사이 시차 ms (기본 90ms) */
  stagger?: number;
};

export default function ListCascade({
  items,
  duration = 300,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  stagger = 90,
}: ListCascadeProps) {
  return (
    <ul className={styles.cascade} style={{ "--duration": `${duration}ms`, "--easing": easing } as CSSProperties}>
      {items.map((label, i) => (
        <li key={label} style={{ animationDelay: `${i * stagger}ms` }}>
          {label}
        </li>
      ))}
    </ul>
  );
}