09CTA glow

<main class="stage">
  <button class="cg-btn" type="button">Get started</button>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 1.8s;
$easing: $ease-spring;
$color: $subject-blue-deep;   // 크림 글자가 얹히므로 진한 파랑

@include stage($stage-ink);

.cg-btn {
  position: relative;
  border: 0;
  border-radius: $r-pill;
  padding: $sp-4 $sp-8;
  background: $color;
  color: $subject-cream;
  font: 700 15px/1 -apple-system, "Segoe UI", sans-serif;
  cursor: pointer;
}

// 글로우 — 버튼 뒤에 흐린 원, opacity·scale 만 움직인다 (filter 값 자체는 고정)
.cg-btn::before {
  content: "";
  position: absolute;
  inset: -#{$sp-3};
  border-radius: $r-pill;
  background: radial-gradient(circle, rgba($color, .9), transparent 65%);
  filter: blur(3px);
  opacity: .2;
  transform: scale(1);
}

// 자동 재생 — 결제 버튼은 항상 은은하게 맥동한다
.cg-btn::before {
  animation: cg-pulse $duration $easing infinite;
}
@keyframes cg-pulse {
  0%, 100% { transform: scale(1); opacity: .2; }
  50% { transform: scale(1.45); opacity: .95; }
}

@media (prefers-reduced-motion: reduce) {
  .cg-btn::before { animation: none !important; opacity: .2 !important; transform: scale(1) !important; }
}

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);
}

.cg-btn {
  position: relative;
  border: 0;
  border-radius: 999px;
  padding: 16px 32px;
  background: #0a4fe8;
  color: #fff7e6;
  font: 700 15px/1 -apple-system, "Segoe UI", sans-serif;
  cursor: pointer;
}

.cg-btn::before {
  content: "";
  position: absolute;
  inset: -12px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(10, 79, 232, 0.9), transparent 65%);
  filter: blur(3px);
  opacity: 0.2;
  transform: scale(1);
}

.cg-btn::before {
  animation: cg-pulse 1.8s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes cg-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.2;
  }
  50% {
    transform: scale(1.45);
    opacity: 0.95;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cg-btn::before {
    animation: none !important;
    opacity: 0.2 !important;
    transform: scale(1) !important;
  }
}

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

export interface CtaGlowProps {
  duration?: string;
  easing?: string;
  label?: string;
}

export default function CtaGlow({
  duration = "1.8s",
  easing = "cubic-bezier(.2, 1.4, .4, 1)",
  label = "Get started",
}: CtaGlowProps) {
  const style = { "--duration": duration, "--easing": easing } as CSSProperties;
  return (
    <button className={styles.btn} style={style} type="button">
      {label}
    </button>
  );
}