03Holographic foil cards

<main class="stage">
  <article class="card-c">
    <span class="card-c__icon" aria-hidden="true"></span>
    <h3 class="card-c__title">Live preview</h3>
    <p class="card-c__desc">Every change reflects on screen instantly.</p>
  </article>
</main>

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

$duration: $dur-loop;
$easing: linear;
$color: $subject-blue;

@include stage($stage-orange);
.stage { padding: clamp(8px, 3vw, 20px); }

.card-c {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: min(240px, 78vw);
  border-radius: $r-card;
  background: $stage-ink;
  box-shadow: $shadow-raised;
  padding: $sp-5;
  display: flex;
  flex-direction: column;
  gap: $sp-2;
}
// 홀로그램 포일 띠 — mix-blend-mode 로 카드 표면 위에 얹혀 대각선으로 한 바퀴씩 지나간다 (유일한 애니메이션)
.card-c::after {
  content: "";
  position: absolute;
  inset: -30% -10%;
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: .8;
  background: repeating-linear-gradient(115deg,
    transparent 0 18px,
    rgba($color, .55) 18px 30px,
    rgba($stage-yellow, .55) 30px 42px,
    rgba($subject-cream, .6) 42px 54px,
    transparent 54px 72px);
  background-size: 200% 200%;
  animation: foilSweep $duration $easing infinite;
}
.card-c__icon { position: relative; z-index: 1; width: $sp-8; height: $sp-8; border-radius: $r-sm; background: radial-gradient(circle at 30% 30%, $subject-cream, $color 55%, $stage-ink 100%); }
.card-c__title {
  position: relative;
  z-index: 1;
  margin: 0;
  color: $stage-paper;
  font-weight: 700;
  font-size: clamp(13px, 3.2vw, 15px);
  line-height: 1.3;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}
.card-c__desc {
  position: relative;
  z-index: 1;
  margin: 0;
  color: rgba($stage-paper, .7);
  font-weight: 500;
  font-size: clamp(11px, 2.6vw, 12.5px);
  line-height: 1.4;
  font-family: inherit;
}

@keyframes foilSweep { 0% { background-position: 0% 0%; } 100% { background-position: -140% -140%; } }

@media (prefers-reduced-motion: reduce) {
  .card-c::after { animation: none; }
}

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);
}

.stage {
  padding: clamp(8px, 3vw, 20px);
}

.card-c {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: min(240px, 78vw);
  border-radius: 16px;
  background: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-c::after {
  content: "";
  position: absolute;
  inset: -30% -10%;
  pointer-events: none;
  mix-blend-mode: overlay;
  opacity: 0.8;
  background: repeating-linear-gradient(115deg, transparent 0 18px, rgba(47, 109, 246, 0.55) 18px 30px, rgba(255, 210, 63, 0.55) 30px 42px, rgba(255, 247, 230, 0.6) 42px 54px, transparent 54px 72px);
  background-size: 200% 200%;
  animation: foilSweep 2s linear infinite;
}

.card-c__icon {
  position: relative;
  z-index: 1;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: radial-gradient(circle at 30% 30%, #fff7e6, #2f6df6 55%, #17141a 100%);
}

.card-c__title {
  position: relative;
  z-index: 1;
  margin: 0;
  color: #ffffff;
  font-weight: 700;
  font-size: clamp(13px, 3.2vw, 15px);
  line-height: 1.3;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.card-c__desc {
  position: relative;
  z-index: 1;
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 500;
  font-size: clamp(11px, 2.6vw, 12.5px);
  line-height: 1.4;
  font-family: inherit;
}

@keyframes foilSweep {
  0% {
    background-position: 0% 0%;
  }
  100% {
    background-position: -140% -140%;
  }
}
@media (prefers-reduced-motion: reduce) {
  .card-c::after {
    animation: none;
  }
}

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

export type CardGridChromeProps = {
  title?: string;
  desc?: string;
  /** 한 주기(기본 2000ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function CardGridChrome({
  title = "Live preview",
  desc = "Every change reflects on screen instantly.",
  duration = 2000,
  easing = "linear",
  color = "#2f6df6",
}: CardGridChromeProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <article className={styles.card} style={vars}>
      <span className={styles.icon} aria-hidden="true" />
      <h3 className={styles.title}>{title}</h3>
      <p className={styles.desc}>{desc}</p>
    </article>
  );
}