01눌린 듯 떠 있는 히어로

<main class="stage">
  <section class="heroneu">
    <span class="heroneu__orb heroneu__orb--a is-demo" aria-hidden="true"></span>
    <span class="heroneu__orb heroneu__orb--b is-demo" aria-hidden="true"></span>
    <div class="heroneu__card is-demo">
      <p class="heroneu__eyebrow">Neumo</p>
      <h1 class="heroneu__title">눌린 듯 떠 있는 화면</h1>
      <p class="heroneu__desc">그림자 두 겹이 전부입니다</p>
      <button class="heroneu__cta" type="button">무료로 시작</button>
    </div>
  </section>
</main>

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

$duration: $dur-loop;       // 오브가 떠도는 한 주기
$easing: $ease-spring;      // 떠오르는 곡선
$color: $subject-blue;      // 강조 색 — 배경과 분리되는 유일한 색

@include stage($stage-ink);

// 뉴모피즘의 정의: 표면이 배경과 거의 같은 색이어야 그림자만으로 입체감이 생긴다.
// 완전히 같은 값이면 밝은 쪽 그림자가 갈 곳이 없어(검은 배경보다 밝힐 여지는 있다) 배경보다 살짝 밝게 둔다.
$neu-surface: mix($stage-ink, white, 92%);
$neu-light: rgba(mix($neu-surface, white, 40%), .5);
$neu-dark: rgba(mix($neu-surface, black, 40%), .5);

.heroneu {
  position: relative;
  width: clamp(240px, 82vw, 380px);
}
.heroneu__orb {
  position: absolute;
  width: clamp(90px, 34vw, 140px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba($color, .3);
  pointer-events: none;
  filter: blur(2px);
}
.heroneu__orb--a {
  top: -18px;
  left: -18px;
  animation: orbA $duration $easing infinite;
}
.heroneu__orb--b {
  bottom: -20px;
  right: -14px;
  background: rgba($color, .18);
  animation: orbB $duration $easing infinite;
  animation-delay: -1s;
}
.heroneu__card {
  position: relative;
  box-sizing: border-box;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: $sp-1;
  padding: $sp-4;
  border-radius: $r-card;
  background: $neu-surface;
  box-shadow: 9px 9px 16px $neu-dark, -9px -9px 16px $neu-light;
  animation: cardFloat $duration $easing infinite;
}
.heroneu__eyebrow {
  margin: 0;
  color: $subject-blue-light;
  font-weight: 700; font-size: clamp(10px, 2.6vw, 12px); line-height: 1;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.heroneu__title {
  margin: 0;
  color: $subject-cream;
  font-weight: 700; font-size: clamp(18px, 4.6vw, 24px); line-height: 1.2;
}
.heroneu__desc {
  margin: 0;
  color: rgba($subject-cream, .65);
  font-weight: 500; font-size: clamp(12px, 2.8vw, 14px); line-height: 1.4;
}
.heroneu__cta {
  margin-top: $sp-1;
  border: 0;
  border-radius: $r-pill;
  background: $neu-surface;
  color: $subject-blue-light;
  padding: $sp-2 $sp-5;
  font-weight: 700; font-size: clamp(12px, 2.8vw, 14px); line-height: 1;
  box-shadow: 5px 5px 10px $neu-dark, -5px -5px 10px $neu-light;
}
.heroneu__cta:focus-visible {
  outline: 3px solid $color;
  outline-offset: 2px;
}

// 데모: 오브 두 개가 반대 위상으로 떠돌고, 카드는 살짝 떠올랐다 가라앉는다 (WAAPI 시계가 잡을 수 있게 keyframes)
@keyframes orbA {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(6%, 8%) scale(1.12); }
}
@keyframes orbB {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50%      { transform: translate(-6%, -6%) scale(.9); }
}
@keyframes cardFloat {
  0%, 100% { transform: translateY(0); box-shadow: 9px 9px 16px $neu-dark, -9px -9px 16px $neu-light; }
  50%      { transform: translateY(-6px); box-shadow: 12px 12px 20px $neu-dark, -12px -12px 20px $neu-light; }
}

@media (prefers-reduced-motion: reduce) {
  .heroneu__orb, .heroneu__card { animation: none !important; transform: 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);
}

.heroneu {
  position: relative;
  width: clamp(240px, 82vw, 380px);
}

.heroneu__orb {
  position: absolute;
  width: clamp(90px, 34vw, 140px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(47, 109, 246, 0.3);
  pointer-events: none;
  filter: blur(2px);
}

.heroneu__orb--a {
  top: -18px;
  left: -18px;
  animation: orbA 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.heroneu__orb--b {
  bottom: -20px;
  right: -14px;
  background: rgba(47, 109, 246, 0.18);
  animation: orbB 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
  animation-delay: -1s;
}

.heroneu__card {
  position: relative;
  box-sizing: border-box;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 16px;
  border-radius: 16px;
  background: rgb(16.2980392157%, 15.2156862745%, 17.3803921569%);
  box-shadow: 9px 9px 16px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), -9px -9px 16px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
  animation: cardFloat 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.heroneu__eyebrow {
  margin: 0;
  color: #5b8cf8;
  font-weight: 700;
  font-size: clamp(10px, 2.6vw, 12px);
  line-height: 1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.heroneu__title {
  margin: 0;
  color: #fff7e6;
  font-weight: 700;
  font-size: clamp(18px, 4.6vw, 24px);
  line-height: 1.2;
}

.heroneu__desc {
  margin: 0;
  color: rgba(255, 247, 230, 0.65);
  font-weight: 500;
  font-size: clamp(12px, 2.8vw, 14px);
  line-height: 1.4;
}

.heroneu__cta {
  margin-top: 4px;
  border: 0;
  border-radius: 999px;
  background: rgb(16.2980392157%, 15.2156862745%, 17.3803921569%);
  color: #5b8cf8;
  padding: 8px 20px;
  font-weight: 700;
  font-size: clamp(12px, 2.8vw, 14px);
  line-height: 1;
  box-shadow: 5px 5px 10px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), -5px -5px 10px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
}

.heroneu__cta:focus-visible {
  outline: 3px solid #2f6df6;
  outline-offset: 2px;
}

@keyframes orbA {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(6%, 8%) scale(1.12);
  }
}
@keyframes orbB {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-6%, -6%) scale(0.9);
  }
}
@keyframes cardFloat {
  0%, 100% {
    transform: translateY(0);
    box-shadow: 9px 9px 16px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), -9px -9px 16px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
  }
  50% {
    transform: translateY(-6px);
    box-shadow: 12px 12px 20px rgba(6.5192156863%, 6.0862745098%, 6.9521568627%, 0.5), -12px -12px 20px rgba(66.5192156863%, 66.0862745098%, 66.9521568627%, 0.5);
  }
}
@media (prefers-reduced-motion: reduce) {
  .heroneu__orb, .heroneu__card {
    animation: none !important;
    transform: none;
  }
}

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

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

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

export default function HeroNeu({
  eyebrow = "Neumo",
  title = "눌린 듯 떠 있는 화면",
  desc = "그림자 두 겹이 전부입니다",
  cta = "무료로 시작",
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: HeroNeuProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <section className={styles.hero} style={vars}>
      <span className={`${styles.orb} ${styles.orbA}`} aria-hidden="true" />
      <span className={`${styles.orb} ${styles.orbB}`} aria-hidden="true" />
      <div className={styles.card}>
        <p className={styles.eyebrow}>{eyebrow}</p>
        <h1 className={styles.title}>{title}</h1>
        <p className={styles.desc}>{desc}</p>
        <button type="button" className={styles.cta}>{cta}</button>
      </div>
    </section>
  );
}