07Hiện khi focus bàn phím

<main class="stage">
  <div class="tip-wrap">
    <button class="gear-btn" type="button" aria-describedby="tip07">Cài đặt</button>
    <span class="tooltip is-demo" role="tooltip" id="tip07">Cũng hiện khi di chuyển bằng phím Tab</span>
  </div>
</main>

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

$duration: $dur-loop;                              // 숨김→표시→숨김 한 주기
$easing: $ease-out;
$color: $subject-cream;                            // 버튼·툴팁 색 (주황 무대라 크림)

@include stage($stage-orange);

.tip-wrap { position: relative; }

.gear-btn {
  border: 2px solid $color;
  border-radius: $r-control;
  padding: 10px 24px;
  font-weight: 600;
  font-size: 15px;
  line-height: 1;
  font-family: inherit;
  color: $subject-ink;                             // AA: 주황 무대 위 글자 5.50:1 (테두리는 크림 유지)
  background: transparent;
  cursor: pointer;
}

.tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform-origin: bottom center; // 규칙8: 버튼 쪽 아래변 축 — 흔들림의 회전 중심
  transform: translateX(-50%) scale(.85);
  opacity: 0;
  background: $color;
  color: $stage-orange;
  padding: 8px 14px;
  border-radius: $r-control;
  font-size: clamp(12px, 3.4vw, 14px);
  white-space: nowrap;
  pointer-events: none;
}

// 실사용: 마우스 호버뿐 아니라 :focus-visible 에도 같은 규칙이 붙는다 (버튼을 Tab 으로 옮겨도 뜬다)
.gear-btn:hover + .tooltip,
.gear-btn:focus-visible + .tooltip {
  opacity: 1;
}

// 데모: 실제 포커스 없이 혼자 표시→숨김을 반복한다
// 등장에 스프링 한 겹 — 스케일 .85 → 1.12 오버슛 → 감쇠 반동, 회전은 아래변 축으로 2.6° → -1.5° → .6° 감쇠
.tooltip.is-demo {
  animation: tip-loop $duration $easing infinite;
}

@keyframes tip-loop {
  0%       { opacity: 0; transform: translateX(-50%) scale(.85) rotate(0deg); }
  12%      { opacity: 1; transform: translateX(-50%) scale(1.12) rotate(2.6deg); }
  22%      { opacity: 1; transform: translateX(-50%) scale(.95) rotate(-1.5deg); }
  30%      { opacity: 1; transform: translateX(-50%) scale(1.03) rotate(.6deg); }
  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: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.tip-wrap {
  position: relative;
}

.gear-btn {
  border: 2px solid #fff7e6;
  border-radius: 12px;
  padding: 10px 24px;
  font-weight: 600;
  font-size: 15px;
  line-height: 1;
  font-family: inherit;
  color: #17141a;
  background: transparent;
  cursor: pointer;
}

.tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform-origin: bottom center;
  transform: translateX(-50%) scale(0.85);
  opacity: 0;
  background: #fff7e6;
  color: #ff4d1f;
  padding: 8px 14px;
  border-radius: 12px;
  font-size: clamp(12px, 3.4vw, 14px);
  white-space: nowrap;
  pointer-events: none;
}

.gear-btn:hover + .tooltip,
.gear-btn:focus-visible + .tooltip {
  opacity: 1;
}

.tooltip.is-demo {
  animation: tip-loop 2s ease-out infinite;
}

@keyframes tip-loop {
  0% {
    opacity: 0;
    transform: translateX(-50%) scale(0.85) rotate(0deg);
  }
  12% {
    opacity: 1;
    transform: translateX(-50%) scale(1.12) rotate(2.6deg);
  }
  22% {
    opacity: 1;
    transform: translateX(-50%) scale(0.95) rotate(-1.5deg);
  }
  30% {
    opacity: 1;
    transform: translateX(-50%) scale(1.03) rotate(0.6deg);
  }
  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 type { CSSProperties, ReactNode } from "react";
import styles from "./FocusTooltip.module.scss";

export type FocusTooltipProps = {
  label: ReactNode;
  text: string;
  duration?: number;
  easing?: string;
  color?: string;
};

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

// :hover 와 :focus-visible 을 CSS 에서 같이 걸어 뒀다 — Tab 으로 옮겨도 마우스 호버와 같은 툴팁이 뜬다.
export default function FocusTooltip({
  label,
  text,
  duration = 200,
  easing = "ease-out",
  color = "#fff7e6",
}: FocusTooltipProps) {
  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="focus-tooltip">
        {label}
      </button>
      <span id="focus-tooltip" role="tooltip" className={styles.tooltip}>
        {text}
      </span>
    </span>
  );
}