01Nghiêng thẻ theo con trỏ kiểu holographic

<main class="stage">
  <article class="holo-card is-demo" tabindex="0">
    <div class="holo-card__shine" aria-hidden="true"></div>
    <div class="holo-card__body">
      <span class="holo-card__badge">Phiên bản giới hạn</span>
      <h3 class="holo-card__title">Midnight Aurora</h3>
    </div>
  </article>
</main>

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

$duration: $dur-quick;                                 // 카드 기울기·시프트가 전환되는 시간
$easing: $ease-out;
$color: $subject-blue;                                 // 카드 뒷면 그라디언트 색

@include stage($stage-ink);

.holo-card {
  --mx: 50%; --my: 35%; --rx: 0deg; --ry: 0deg;
  position: relative;
  width: min(128px, 40vw);
  aspect-ratio: 4 / 5;
  border-radius: $r-card;
  overflow: hidden;
  background: linear-gradient(155deg, $color 0%, $stage-ink 100%);
  box-shadow: $shadow-raised;
  outline: none;
  cursor: pointer;
  transform: perspective(700px) rotateX(var(--rx)) rotateY(var(--ry));
  transition: transform $duration $easing, box-shadow $duration $easing;
}
.holo-card__shine {
  position: absolute;
  inset: -20%;
  background: conic-gradient(from 0deg, #dcb9d1, #b9d9dc, #c8dcb9, #dcdab9, #dcb9d1);
  background-size: 240% 240%;
  background-position: var(--mx) var(--my);
  mix-blend-mode: color-dodge;
  opacity: .55;
  pointer-events: none;
  transition: opacity $duration $easing, background-position $duration $easing;
}
.holo-card__body {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: $sp-4;
  background: linear-gradient(0deg, rgba($stage-ink, .78), rgba($stage-ink, 0));
}
.holo-card__badge {
  display: inline-block;
  padding: $sp-1 $sp-2;
  margin-bottom: $sp-2;
  border-radius: $r-pill;
  background: $stage-paper;
  color: $stage-ink;
  font-weight: 700;
  font-size: 10px;
  font-family: inherit;
}
.holo-card__title { margin: 0; color: $stage-paper; font-weight: 700; font-size: clamp(13px, 4vw, 15px); line-height: 1.3; font-family: inherit; }

.holo-card:hover,
.holo-card:focus-visible { box-shadow: $shadow-press; }
.holo-card:hover .holo-card__shine,
.holo-card:focus-visible .holo-card__shine { opacity: .85; }

.holo-card.is-demo { animation: tilt-loop $dur-loop $easing infinite; }
.holo-card.is-demo .holo-card__shine { animation: shine-loop $dur-loop $easing infinite; }

@keyframes tilt-loop {
  0%, 10%   { transform: perspective(700px) rotateX(0deg) rotateY(0deg); }
  35%       { transform: perspective(700px) rotateX(-10deg) rotateY(12deg); }
  65%       { transform: perspective(700px) rotateX(8deg) rotateY(-10deg); }
  90%, 100% { transform: perspective(700px) rotateX(0deg) rotateY(0deg); }
}
@keyframes shine-loop {
  0%, 10%   { background-position: 50% 50%; opacity: .55; }
  35%       { background-position: 15% 20%; opacity: .9; }
  65%       { background-position: 85% 80%; opacity: .9; }
  90%, 100% { background-position: 50% 50%; opacity: .55; }
}

@media (hover: none) {
  .holo-card:active { box-shadow: $shadow-press; }
  .holo-card:active .holo-card__shine { opacity: .85; }
}
@media (prefers-reduced-motion: reduce) {
  .holo-card { transition: none; }
  .holo-card__shine { transition: none; opacity: .7; }
  .holo-card.is-demo,
  .holo-card.is-demo .holo-card__shine { animation: none; }
}

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);
}

.holo-card {
  --mx: 50%;
  --my: 35%;
  --rx: 0deg;
  --ry: 0deg;
  position: relative;
  width: min(128px, 40vw);
  aspect-ratio: 4/5;
  border-radius: 16px;
  overflow: hidden;
  background: linear-gradient(155deg, #2f6df6 0%, #17141a 100%);
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  outline: none;
  cursor: pointer;
  transform: perspective(700px) rotateX(var(--rx)) rotateY(var(--ry));
  transition: transform 220ms ease-out, box-shadow 220ms ease-out;
}

.holo-card__shine {
  position: absolute;
  inset: -20%;
  background: conic-gradient(from 0deg, #dcb9d1, #b9d9dc, #c8dcb9, #dcdab9, #dcb9d1);
  background-size: 240% 240%;
  background-position: var(--mx) var(--my);
  mix-blend-mode: color-dodge;
  opacity: 0.55;
  pointer-events: none;
  transition: opacity 220ms ease-out, background-position 220ms ease-out;
}

.holo-card__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px;
  background: linear-gradient(0deg, rgba(23, 20, 26, 0.78), rgba(23, 20, 26, 0));
}

.holo-card__badge {
  display: inline-block;
  padding: 4px 8px;
  margin-bottom: 8px;
  border-radius: 999px;
  background: #ffffff;
  color: #17141a;
  font-weight: 700;
  font-size: 10px;
  font-family: inherit;
}

.holo-card__title {
  margin: 0;
  color: #ffffff;
  font-weight: 700;
  font-size: clamp(13px, 4vw, 15px);
  line-height: 1.3;
  font-family: inherit;
}

.holo-card:hover,
.holo-card:focus-visible {
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.holo-card:hover .holo-card__shine,
.holo-card:focus-visible .holo-card__shine {
  opacity: 0.85;
}

.holo-card.is-demo {
  animation: tilt-loop 2s ease-out infinite;
}

.holo-card.is-demo .holo-card__shine {
  animation: shine-loop 2s ease-out infinite;
}

@keyframes tilt-loop {
  0%, 10% {
    transform: perspective(700px) rotateX(0deg) rotateY(0deg);
  }
  35% {
    transform: perspective(700px) rotateX(-10deg) rotateY(12deg);
  }
  65% {
    transform: perspective(700px) rotateX(8deg) rotateY(-10deg);
  }
  90%, 100% {
    transform: perspective(700px) rotateX(0deg) rotateY(0deg);
  }
}
@keyframes shine-loop {
  0%, 10% {
    background-position: 50% 50%;
    opacity: 0.55;
  }
  35% {
    background-position: 15% 20%;
    opacity: 0.9;
  }
  65% {
    background-position: 85% 80%;
    opacity: 0.9;
  }
  90%, 100% {
    background-position: 50% 50%;
    opacity: 0.55;
  }
}
@media (hover: none) {
  .holo-card:active {
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
  .holo-card:active .holo-card__shine {
    opacity: 0.85;
  }
}
@media (prefers-reduced-motion: reduce) {
  .holo-card {
    transition: none;
  }
  .holo-card__shine {
    transition: none;
    opacity: 0.7;
  }
  .holo-card.is-demo,
  .holo-card.is-demo .holo-card__shine {
    animation: none;
  }
}

var c=document.querySelector('.holo-card');
c.addEventListener('pointermove',function(e){
  if(c.classList.contains('is-demo'))return;
  var r=c.getBoundingClientRect(),mx=(e.clientX-r.left)/r.width*100,my=(e.clientY-r.top)/r.height*100;
  c.style.setProperty('--mx',mx+'%');c.style.setProperty('--my',my+'%');
  c.style.setProperty('--rx',((my/100)-.5)*-14+'deg');c.style.setProperty('--ry',((mx/100)-.5)*14+'deg');
});
c.addEventListener('pointerleave',function(){
  if(c.classList.contains('is-demo'))return;
  c.style.setProperty('--mx','50%');c.style.setProperty('--my','50%');
  c.style.setProperty('--rx','0deg');c.style.setProperty('--ry','0deg');
});

import { useRef, type CSSProperties, type PointerEvent } from "react";
import styles from "./HoloCardMouseTilt.module.scss";

export type HoloCardMouseTiltProps = {
  badge: string;
  title: string;
  /** 기울기·시프트가 전환되는 시간 (기본 220ms) */
  duration?: number;
  easing?: string;
  /** 카드 뒷면 그라디언트 색 */
  color?: string;
};

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

/** pointermove 로 --mx/--my/--rx/--ry 를 직접 놓는다 — :hover 만으로는 커서 좌표를 못 읽는다 */
export default function HoloCardMouseTilt({
  badge,
  title,
  duration = 220,
  easing = "ease-out",
  color = "#2f6df6",
}: HoloCardMouseTiltProps) {
  const ref = useRef<HTMLDivElement | null>(null);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  const move = (e: PointerEvent<HTMLDivElement>) => {
    const el = ref.current;
    if (!el) return;
    const r = el.getBoundingClientRect();
    const mx = ((e.clientX - r.left) / r.width) * 100;
    const my = ((e.clientY - r.top) / r.height) * 100;
    el.style.setProperty("--mx", `${mx}%`);
    el.style.setProperty("--my", `${my}%`);
    el.style.setProperty("--rx", `${(my / 100 - 0.5) * -14}deg`);
    el.style.setProperty("--ry", `${(mx / 100 - 0.5) * 14}deg`);
  };
  const leave = () => {
    const el = ref.current;
    if (!el) return;
    el.style.setProperty("--mx", "50%");
    el.style.setProperty("--my", "50%");
    el.style.setProperty("--rx", "0deg");
    el.style.setProperty("--ry", "0deg");
  };

  return (
    <article
      ref={ref}
      className={styles.card}
      style={vars}
      tabIndex={0}
      onPointerMove={move}
      onPointerLeave={leave}
    >
      <div className={styles.shine} aria-hidden="true" />
      <div className={styles.body}>
        <span className={styles.badge}>{badge}</span>
        <h3 className={styles.title}>{title}</h3>
      </div>
    </article>
  );
}