08Viền chữ glow

<main class="stage">
  <h1 class="outline">Dùng thử miễn phí</h1>
</main>

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

$duration: $dur-loop;                              // 빛이 커졌다 작아지는 숨쉬기 한 주기
$easing: $ease-spring;
$color: $subject-blue;                              // 윤곽선·빛 색

@include stage($stage-paper);

.outline {
  margin: 0;
  font-weight: 900; font-size: clamp(28px, 8.8vw, 46px); line-height: 1.2; font-family: inherit;
  text-align: center;
  color: transparent;                                 // 속을 비워 윤곽선만 남긴다
  -webkit-text-stroke: 2px $color;
  text-stroke: 2px $color;
  animation: glow $duration $easing infinite;
}

@keyframes glow {
  0%, 100% { filter: drop-shadow(0 0 3px rgba($color, .5)); }
  50%      { filter: drop-shadow(0 0 14px rgba($color, .9)) drop-shadow(0 0 26px rgba($color, .5)); }
}

@media (prefers-reduced-motion: reduce) {
  .outline { animation: none; filter: drop-shadow(0 0 10px rgba($color, .7)); }
}

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);
}

.outline {
  margin: 0;
  font-weight: 900;
  font-size: clamp(28px, 8.8vw, 46px);
  line-height: 1.2;
  font-family: inherit;
  text-align: center;
  color: transparent;
  -webkit-text-stroke: 2px #2f6df6;
  text-stroke: 2px #2f6df6;
  animation: glow 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes glow {
  0%, 100% {
    filter: drop-shadow(0 0 3px rgba(47, 109, 246, 0.5));
  }
  50% {
    filter: drop-shadow(0 0 14px rgba(47, 109, 246, 0.9)) drop-shadow(0 0 26px rgba(47, 109, 246, 0.5));
  }
}
@media (prefers-reduced-motion: reduce) {
  .outline {
    animation: none;
    filter: drop-shadow(0 0 10px rgba(47, 109, 246, 0.7));
  }
}

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

export type OutlineGlowTextProps = {
  text: string;
  /** 빛이 커졌다 작아지는 숨쉬기 한 주기 (기본 2000ms) */
  duration?: number;
  easing?: string;
  /** 윤곽선·빛 색 */
  color?: string;
};

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

export default function OutlineGlowText({
  text,
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: OutlineGlowTextProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return <h1 className={styles.outline} style={vars}>{text}</h1>;
}