04Nhấp nháy nhẹ

<main class="stage">
  <button class="btn a-pulse" type="button">Bắt đầu ngay</button>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;          // 2초 — 너무 빠르면 강조가 아니라 깜빡임으로 읽힌다
$easing: $ease-out;
$color: $subject-blue;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-paper);

.btn {
  border: 0;
  border-radius: $r-control;
  padding: 16px 40px;
  background: $subject-blue-deep;         // AA: 파란 면을 깊게 — 흰 글자 6.3:1
  color: #fff;
  font-weight: 700; font-size: clamp(15px, 4vw, 18px); line-height: 1; font-family: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

// ── .a-pulse 는 레이아웃을 다시 그리지 않고 scale·opacity 만 쓴다 ─
.a-pulse {
  animation: pulse $duration $easing infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1);     opacity: 1; }
  50%      { transform: scale(1.06);  opacity: .92; }
}

@media (prefers-reduced-motion: reduce) {
  .a-pulse { animation: none; }
}

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

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

.btn {
  border: 0;
  border-radius: 12px;
  padding: 16px 40px;
  background: #0a4fe8;
  color: #fff;
  font-weight: 700;
  font-size: clamp(15px, 4vw, 18px);
  line-height: 1;
  font-family: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.a-pulse {
  animation: pulse 2s ease-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.06);
    opacity: 0.92;
  }
}
@media (prefers-reduced-motion: reduce) {
  .a-pulse {
    animation: none;
  }
}

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

export type PulseButtonProps = {
  children: ReactNode;
  /** 한 번 오가는 데 걸리는 시간 (기본 2000ms) */
  duration?: number;
  /** CSS easing (기본 ease-out) */
  easing?: string;
  /** 버튼 색 */
  color?: string;
  onClick?: (e: MouseEvent<HTMLButtonElement>) => void;
  type?: "button" | "submit";
};

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

export default function PulseButton({
  children,
  duration = 2000,
  easing = "ease-out",
  color = "#0a4fe8",
  onClick,
  type = "button",
}: PulseButtonProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };
  return (
    <button type={type} className={styles.btn} style={vars} onClick={onClick}>
      {children}
    </button>
  );
}