03CTA pulse glow

<main class="stage is-demo">
  <button type="button" class="cta">Get started</button>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;   // 2s — 펄스 한 바퀴
$easing: $ease-pop;
$color: $subject-cream;

@include stage($stage-orange);

.cta {
  box-sizing: border-box;
  border: 0;
  cursor: pointer;
  padding: $sp-4 $sp-8;
  border-radius: $r-pill;
  background: $color;
  color: $subject-orange-deep;
  font-weight: 800;
  font-size: clamp(14px, 4vw, 16px);
  line-height: 1;
  font-family: inherit;
  box-shadow: 0 0 0 0 rgba(255, 224, 102, 0);
  transition: transform $dur-quick $ease-out;
}

.cta:hover { transform: translateY(-2px); }
.cta:focus-visible { outline: 2px solid $subject-ink; outline-offset: 2px; }

// box-shadow 를 애니메이션 대상으로 쓴다 — blog-demo 규칙 1(transform·opacity 만)의 의도적 예외.
// 글로우는 box-shadow(또는 filter) 없이는 성립하지 않는다 (사실.md 기록)
.stage.is-demo .cta { animation: pulse $duration $easing infinite; }

@keyframes pulse {
  0%   { transform: scale(1);     box-shadow: 0 0 0 0 rgba(255, 224, 102, .55); }
  50%  { transform: scale(1.045); box-shadow: 0 0 $sp-8 $sp-2 rgba(255, 224, 102, .55); }
  100% { transform: scale(1);     box-shadow: 0 0 0 0 rgba(255, 224, 102, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .cta { animation: none; box-shadow: 0 0 $sp-6 $sp-1 rgba(255, 224, 102, .35); }
}

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);
}

.cta {
  box-sizing: border-box;
  border: 0;
  cursor: pointer;
  padding: 16px 32px;
  border-radius: 999px;
  background: #fff7e6;
  color: #c93000;
  font-weight: 800;
  font-size: clamp(14px, 4vw, 16px);
  line-height: 1;
  font-family: inherit;
  box-shadow: 0 0 0 0 rgba(255, 224, 102, 0);
  transition: transform 220ms ease-out;
}

.cta:hover {
  transform: translateY(-2px);
}

.cta:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 2px;
}

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

@keyframes pulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(255, 224, 102, 0.55);
  }
  50% {
    transform: scale(1.045);
    box-shadow: 0 0 32px 8px rgba(255, 224, 102, 0.55);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 rgba(255, 224, 102, 0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .cta {
    animation: none;
    box-shadow: 0 0 24px 4px rgba(255, 224, 102, 0.35);
  }
}

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

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

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

export default function CtaPulseGlow({
  label = "Get started",
  duration = 2000,
  easing = "cubic-bezier(.2,1.4,.4,1)",
  color = "#fff7e6",
}: CtaPulseGlowProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <button type="button" className={styles.cta} style={vars}>
      {label}
    </button>
  );
}