05Vòng glow quanh icon

<main class="stage is-demo">
  <span class="icon-wrap" aria-hidden="true">
    <span class="ring ring--a"></span>
    <span class="ring ring--b"></span>
    <span class="icon"></span>
  </span>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;   // 2s — 링 한 번 퍼지는 시간
$easing: ease-out;
$color: #ffb020;        // 네온 앰버 (알림)

@include stage($stage-ink);

.icon-wrap { position: relative; width: 72px; height: 72px; display: grid; place-items: center; }

.icon {
  width: 30px; height: 30px; border-radius: 50%;
  background: $color;
  box-shadow: 0 0 $sp-2 $color, 0 0 $sp-6 rgba($color, .6);
}

.ring {
  position: absolute; inset: 0;
  border-radius: 50%;
  border: 2px solid $color;
  opacity: 0;
}

// transform·opacity 만 — 이 항목은 순수하게 원칙대로다
.stage.is-demo .ring--a { animation: ring $duration $easing infinite; }
.stage.is-demo .ring--b { animation: ring $duration $easing infinite; animation-delay: $duration * .5; }

@keyframes ring {
  0%   { transform: scale(.7); opacity: .8; }
  70%  { transform: scale(1.7); opacity: 0; }
  100% { transform: scale(1.7); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .ring--a, .stage.is-demo .ring--b { animation: none; opacity: 0; }
}

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);
}

.icon-wrap {
  position: relative;
  width: 72px;
  height: 72px;
  display: grid;
  place-items: center;
}

.icon {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: #ffb020;
  box-shadow: 0 0 8px #ffb020, 0 0 24px rgba(255, 176, 32, 0.6);
}

.ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid #ffb020;
  opacity: 0;
}

.stage.is-demo .ring--a {
  animation: ring 2s ease-out infinite;
}

.stage.is-demo .ring--b {
  animation: ring 2s ease-out infinite;
  animation-delay: 1s;
}

@keyframes ring {
  0% {
    transform: scale(0.7);
    opacity: 0.8;
  }
  70% {
    transform: scale(1.7);
    opacity: 0;
  }
  100% {
    transform: scale(1.7);
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .stage.is-demo .ring--a, .stage.is-demo .ring--b {
    animation: none;
    opacity: 0;
  }
}

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

export type IconGlowRingProps = {
  /** 링 한 번 퍼지는 시간 (기본 2000ms) */
  duration?: number;
  color?: string;
};

export default function IconGlowRing({ duration = 2000, color = "#ffb020" }: IconGlowRingProps) {
  const vars: CSSProperties = { "--duration": `${duration}ms`, "--color": color } as CSSProperties;
  return (
    <span className={styles.wrap} style={vars} aria-hidden="true">
      <span className={`${styles.ring} ${styles.ringA}`} />
      <span className={`${styles.ring} ${styles.ringB}`} />
      <span className={styles.icon} />
    </span>
  );
}