01Frosted card

<main class="stage">
  <div class="fc-scene is-demo">
    <span class="fc-blob fc-blob--a"></span>
    <span class="fc-blob fc-blob--b"></span>
    <div class="fc-card fc-focal">
      <span class="fc-card__eyebrow">Featured</span>
      <span class="fc-card__title">Aurora Plan</span>
      <span class="fc-card__desc">Glass surface, real blur</span>
    </div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-base;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-ink);

.fc-scene {
  position: relative;
  width: min(340px, 90vw);
  aspect-ratio: 340 / 190;
  display: grid;
  place-items: center;
  overflow: hidden; // 320px 에서 아래 블러 얼룩이 음수 offset 으로 장면 밖까지 번져 body.scrollHeight 를 넘겼다 (실측 2026-09-10)
}

// 유리 카드 뒤에서 블러될 색 얼룩 — .stage 배경은 그대로 단색, 이 레이어만 그라디언트 역할을 한다
.fc-blob {
  position: absolute;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  filter: blur(30px);
  opacity: .75;
}
.fc-blob--a { background: $color; top: -30px; left: -20px; }
.fc-blob--b { background: $subject-cream; bottom: -40px; right: -10px; }

.fc-card {
  position: relative;
  z-index: 1;
  box-sizing: border-box;
  width: min(220px, 80%);
  padding: $sp-6 $sp-5;
  border-radius: $r-card;
  background: rgba(255, 255, 255, .14);
  border: 1px solid rgba(255, 255, 255, .35);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  box-shadow: $shadow-press;
  display: flex;
  flex-direction: column;
  gap: $sp-1;
  color: $subject-cream;
  font: 600 13px/1.4 -apple-system, "Segoe UI", sans-serif;
  transition: transform $duration $easing, box-shadow $duration $easing;
}
.fc-card__eyebrow { font-size: 11px; letter-spacing: .02em; }   // opacity .75 는 파란 얼룩 위 3.31:1 이라 뺐다 — AA 4.5
.fc-card__title { font-size: 18px; font-weight: 700; }
.fc-card__desc { font-size: 12px; opacity: .8; font-weight: 500; }

// 실사용: 진짜 마우스 호버로 트랜지션
.fc-focal:hover {
  transform: scale(1.03);
  box-shadow: $shadow-raised;
}

// 데모 루프: is-demo 는 같은 모양을 keyframes 로 무한 재생 (헤드리스는 :hover 를 못 건다)
@keyframes fc-breathe {
  0%, 100% { transform: scale(1); box-shadow: $shadow-press; }
  50% { transform: scale(1.03); box-shadow: $shadow-raised; }
}
.fc-scene.is-demo .fc-focal { animation: fc-breathe $duration $easing infinite; }

@media (prefers-reduced-motion: reduce) {
  .fc-focal:hover,
  .fc-scene.is-demo .fc-focal { animation: none !important; transform: none !important; box-shadow: $shadow-press !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);
}

.fc-scene {
  position: relative;
  width: min(340px, 90vw);
  aspect-ratio: 340/190;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.fc-blob {
  position: absolute;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  filter: blur(30px);
  opacity: 0.75;
}

.fc-blob--a {
  background: #2f6df6;
  top: -30px;
  left: -20px;
}

.fc-blob--b {
  background: #fff7e6;
  bottom: -40px;
  right: -10px;
}

.fc-card {
  position: relative;
  z-index: 1;
  box-sizing: border-box;
  width: min(220px, 80%);
  padding: 24px 20px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: #fff7e6;
  font: 600 13px/1.4 -apple-system, "Segoe UI", sans-serif;
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.fc-card__eyebrow {
  font-size: 11px;
  letter-spacing: 0.02em;
}

.fc-card__title {
  font-size: 18px;
  font-weight: 700;
}

.fc-card__desc {
  font-size: 12px;
  opacity: 0.8;
  font-weight: 500;
}

.fc-focal:hover {
  transform: scale(1.03);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

@keyframes fc-breathe {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
  50% {
    transform: scale(1.03);
    box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  }
}
.fc-scene.is-demo .fc-focal {
  animation: fc-breathe 300ms cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .fc-focal:hover,
  .fc-scene.is-demo .fc-focal {
    animation: none !important;
    transform: none !important;
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32) !important;
  }
}

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

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

export interface FrostedCardProps {
  duration?: string;
  easing?: string;
  color?: string;
}

export default function FrostedCard({
  duration = "300ms",
  easing = "cubic-bezier(.2, .8, .2, 1)",
  color = "#2f6df6",
}: FrostedCardProps) {
  const style: Vars = {
    "--duration": duration,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.scene} style={style}>
      <span className={styles.blobA} />
      <span className={styles.blobB} />
      <div className={styles.card}>
        <span className={styles.eyebrow}>Featured</span>
        <span className={styles.title}>Aurora Plan</span>
        <span className={styles.desc}>Glass surface, real blur</span>
      </div>
    </div>
  );
}