04Chữ quét sáng

<main class="stage">
  <h1 class="sheen">
    <span class="sheen__base">Chỉ dành cho hội viên Gold</span>
    <span class="sheen__light" aria-hidden="true">Chỉ dành cho hội viên Gold</span>
  </h1>
</main>

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

$duration: $dur-loop;                              // 빛 띠가 한 번 훑고 돌아오는 시간
$easing: $ease-out;
$color: $subject-ink;                               // 바탕 글자 색 (금속처럼 진하게)

@include stage($stage-paper);

.sheen {
  position: relative;
  margin: 0;
  font-weight: 800; font-size: clamp(26px, 8vw, 42px); line-height: 1.2; font-family: inherit;
  text-align: center;
}

.sheen__base, .sheen__light {
  display: block;
  grid-area: 1 / 1;
}
.sheen { display: grid; }                           // 두 겹을 같은 자리에 포갠다

.sheen__base { color: $color; }

.sheen__light {
  background: linear-gradient(100deg, transparent 42%, rgba($stage-paper, .95) 50%, transparent 58%);
  background-size: 260% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation: sweep $duration $easing infinite;
}

@keyframes sweep {
  0%   { background-position: 140% 50%; }
  60%  { background-position: -40% 50%; }
  100% { background-position: -40% 50%; }
}

@media (prefers-reduced-motion: reduce) {
  .sheen__light { animation: none; background-position: 50% 50%; }
}

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);
}

.sheen {
  position: relative;
  margin: 0;
  font-weight: 800;
  font-size: clamp(26px, 8vw, 42px);
  line-height: 1.2;
  font-family: inherit;
  text-align: center;
}

.sheen__base, .sheen__light {
  display: block;
  grid-area: 1/1;
}

.sheen {
  display: grid;
}

.sheen__base {
  color: #17141a;
}

.sheen__light {
  background: linear-gradient(100deg, transparent 42%, rgba(255, 255, 255, 0.95) 50%, transparent 58%);
  background-size: 260% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
  animation: sweep 2s ease-out infinite;
}

@keyframes sweep {
  0% {
    background-position: 140% 50%;
  }
  60% {
    background-position: -40% 50%;
  }
  100% {
    background-position: -40% 50%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sheen__light {
    animation: none;
    background-position: 50% 50%;
  }
}

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

export type ShineSweepTextProps = {
  text: string;
  /** 빛 띠가 한 번 훑고 돌아오는 시간 (기본 2000ms) */
  duration?: number;
  easing?: string;
  /** 바탕 글자 색 */
  color?: string;
};

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

export default function ShineSweepText({
  text,
  duration = 2000,
  easing = "ease-out",
  color = "#17141a",
}: ShineSweepTextProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <h1 className={styles.sheen} style={vars}>
      <span className={styles.base}>{text}</span>
      <span className={styles.light} aria-hidden="true">{text}</span>
    </h1>
  );
}