02フェード+拡大ポップ

<main class="stage">
  <div class="tip-wrap">
    <button class="info-btn" type="button" aria-describedby="tip02">新着</button>
    <span class="tooltip is-demo" role="tooltip" id="tip02">新しく追加された機能です</span>
  </div>
</main>

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

$duration: $dur-loop;                              // 숨김→표시→숨김 한 주기
$easing: $ease-pop;                                // 끝에서 살짝 튀는 팝 이징
$color: $subject-ink;                              // 트리거 버튼 색 (노란 무대라 먹색)

@include stage($stage-yellow);

.tip-wrap { position: relative; }

.info-btn {
  border: 0;
  border-radius: $r-control;
  padding: 12px 22px;
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
  font-family: inherit;
  color: $stage-yellow;
  background: $color;
  cursor: pointer;
}

.tooltip {
  position: absolute;
  top: calc(100% + 10px);                          // 버튼 아래쪽에 표시
  left: 50%;
  transform-origin: top center; // 규칙8: 버튼 아래변에서 펼침
  transform: translateX(-50%) scale(.85);
  opacity: 0;
  background: $stage-ink;
  color: $stage-yellow;
  padding: 8px 16px;
  border-radius: $r-control;
  font-size: clamp(12px, 3.4vw, 14px);
  white-space: nowrap;
  pointer-events: none;
}

.tooltip.is-demo {
  animation: pop-loop $duration $easing infinite;
}

// 등장 스프링 한 겹 — 스케일은 .85 → 1.14 오버슛 뒤 감쇠 반동(.94 → 1.02)으로 멎고,
// 회전은 화살표 축(윗변 중심)을 중심으로 -2.4° → 1.4° → -.5° 로 감쇠하며 흔들린다
@keyframes pop-loop {
  0%       { opacity: 0; transform: translateX(-50%) scale(.85) rotate(0deg); }
  12%      { opacity: 1; transform: translateX(-50%) scale(1.14) rotate(-2.4deg); }
  22%      { opacity: 1; transform: translateX(-50%) scale(.94) rotate(1.4deg); }
  30%      { opacity: 1; transform: translateX(-50%) scale(1.02) rotate(-.5deg); }
  36%, 55% { opacity: 1; transform: translateX(-50%) scale(1) rotate(0deg); }
  80%      { opacity: 0; transform: translateX(-50%) scale(.85) rotate(0deg); }
  100%     { opacity: 0; transform: translateX(-50%) scale(.85) rotate(0deg); }
}

@media (prefers-reduced-motion: reduce) {
  .tooltip.is-demo { animation: none; opacity: 1; transform: translateX(-50%) scale(1) rotate(0deg); }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.tip-wrap {
  position: relative;
}

.info-btn {
  border: 0;
  border-radius: 12px;
  padding: 12px 22px;
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
  font-family: inherit;
  color: #ffd23f;
  background: #17141a;
  cursor: pointer;
}

.tooltip {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform-origin: top center;
  transform: translateX(-50%) scale(0.85);
  opacity: 0;
  background: #17141a;
  color: #ffd23f;
  padding: 8px 16px;
  border-radius: 12px;
  font-size: clamp(12px, 3.4vw, 14px);
  white-space: nowrap;
  pointer-events: none;
}

.tooltip.is-demo {
  animation: pop-loop 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes pop-loop {
  0% {
    opacity: 0;
    transform: translateX(-50%) scale(0.85) rotate(0deg);
  }
  12% {
    opacity: 1;
    transform: translateX(-50%) scale(1.14) rotate(-2.4deg);
  }
  22% {
    opacity: 1;
    transform: translateX(-50%) scale(0.94) rotate(1.4deg);
  }
  30% {
    opacity: 1;
    transform: translateX(-50%) scale(1.02) rotate(-0.5deg);
  }
  36%, 55% {
    opacity: 1;
    transform: translateX(-50%) scale(1) rotate(0deg);
  }
  80% {
    opacity: 0;
    transform: translateX(-50%) scale(0.85) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) scale(0.85) rotate(0deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .tooltip.is-demo {
    animation: none;
    opacity: 1;
    transform: translateX(-50%) scale(1) rotate(0deg);
  }
}

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

export type PopTooltipProps = {
  label: ReactNode;
  text: string;
  /** 팝 애니메이션 시간 (기본 220ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function PopTooltip({
  label,
  text,
  duration = 220,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#17141a",
}: PopTooltipProps) {
  const [open, setOpen] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <span className={styles.wrap} style={vars}>
      <button
        type="button"
        className={styles.btn}
        aria-describedby="pop-tooltip"
        onMouseEnter={() => setOpen(true)}
        onMouseLeave={() => setOpen(false)}
        onFocus={() => setOpen(true)}
        onBlur={() => setOpen(false)}
      >
        {label}
      </button>
      <span id="pop-tooltip" role="tooltip" className={styles.tooltip} data-open={open}>
        {text}
      </span>
    </span>
  );
}