01呼吸するような拡大+影

<main class="stage">
  <div class="bs-grid is-demo">
    <div class="bs-tile bs-tile--a bs-focal">
      <span class="bs-tile__tag">Project</span>
      <span class="bs-tile__num">01</span>
    </div>
    <div class="bs-tile bs-tile--b">
      <span class="bs-tile__tag">New</span>
    </div>
    <div class="bs-tile bs-tile--c">
      <span class="bs-tile__tag">42%</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);

.bs-grid {
  width: min(340px, 90vw);
  aspect-ratio: 340 / 190;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: $sp-2;
}

.bs-tile {
  border-radius: $r-sm;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: $sp-3;
  box-sizing: border-box;
  color: $subject-cream;
  font: 600 12px/1 -apple-system, "Segoe UI", sans-serif;
}

.bs-tile--a {
  grid-row: 1 / 3;
  background: linear-gradient(160deg, $color, rgba(23, 20, 26, .85));
}

.bs-tile--b, .bs-tile--c {
  background: rgba(255, 255, 255, .08);
}

.bs-tile__tag { opacity: .8; font-size: 11px; }
.bs-tile__num { font-size: 22px; font-weight: 700; margin-top: $sp-1; }

// 실사용: 진짜 마우스 호버로 트랜지션
.bs-focal {
  transition: transform $duration $easing, box-shadow $duration $easing;
  box-shadow: $shadow-press;
}
.bs-focal:hover {
  transform: scale(1.04);
  box-shadow: $shadow-raised;
}

// 데모 루프: is-demo 는 같은 모양을 keyframes 로 무한 재생 (캡처용 — 헤드리스는 :hover 를 못 건다)
@keyframes bs-breathe {
  0%, 100% { transform: scale(1); box-shadow: $shadow-press; }
  50% { transform: scale(1.04); box-shadow: $shadow-raised; }
}
.bs-grid.is-demo .bs-focal { animation: bs-breathe $duration $easing infinite; }

@media (prefers-reduced-motion: reduce) {
  .bs-focal:hover,
  .bs-grid.is-demo .bs-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);
}

.bs-grid {
  width: min(340px, 90vw);
  aspect-ratio: 340/190;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 8px;
}

.bs-tile {
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 12px;
  box-sizing: border-box;
  color: #fff7e6;
  font: 600 12px/1 -apple-system, "Segoe UI", sans-serif;
}

.bs-tile--a {
  grid-row: 1/3;
  background: linear-gradient(160deg, #2f6df6, rgba(23, 20, 26, 0.85));
}

.bs-tile--b, .bs-tile--c {
  background: rgba(255, 255, 255, 0.08);
}

.bs-tile__tag {
  opacity: 0.8;
  font-size: 11px;
}

.bs-tile__num {
  font-size: 22px;
  font-weight: 700;
  margin-top: 4px;
}

.bs-focal {
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.bs-focal:hover {
  transform: scale(1.04);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

@keyframes bs-breathe {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
  50% {
    transform: scale(1.04);
    box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  }
}
.bs-grid.is-demo .bs-focal {
  animation: bs-breathe 300ms cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@media (prefers-reduced-motion: reduce) {
  .bs-focal:hover,
  .bs-grid.is-demo .bs-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 "./BreathScaleShadow.module.scss";

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

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

export default function BreathScaleShadow({
  duration = "300ms",
  easing = "cubic-bezier(.2, .8, .2, 1)",
  color = "#2f6df6",
}: BreathScaleShadowProps) {
  const style: Vars = {
    "--duration": duration,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.grid} style={style}>
      <div className={`${styles.tile} ${styles.tileA} ${styles.focal}`}>
        <span className={styles.tag}>Project</span>
        <span className={styles.num}>01</span>
      </div>
      <div className={`${styles.tile} ${styles.tileB}`}>
        <span className={styles.tag}>New</span>
      </div>
      <div className={`${styles.tile} ${styles.tileC}`}>
        <span className={styles.tag}>42%</span>
      </div>
    </div>
  );
}