01動くオーブ背景ヒーロー

<main class="stage">
  <section class="hero-a">
    <div class="hero-a__orb hero-a__orb--1" aria-hidden="true"></div>
    <div class="hero-a__orb hero-a__orb--2" aria-hidden="true"></div>
    <div class="hero-a__orb hero-a__orb--3" aria-hidden="true"></div>
    <p class="hero-a__eyebrow">AURORA</p>
    <h2 class="hero-a__title">購読者管理を、ひとつの画面で</h2>
    <button class="hero-a__cta" type="button">無料で始める</button>
  </section>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;   // 오브 세 개가 한 바퀴 도는 시간
$easing: steps(4, jump-none);  // 부드러운 곡선은 블러 뒤에서 프레임 간 변화가 너무 작아 안 잡힌다
$color: $subject-blue;  // 오브 색 하나

@include stage($stage-ink);

.hero-a {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: clamp(260px, 84vw, 400px);
  min-height: clamp(172px, 48vw, 220px);
  border-radius: $r-card;
  background: $stage-ink;
  box-shadow: $shadow-raised;
  padding: $sp-6;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: $sp-3;
}

// filter: blur 로 흐린 오브를 겹치고, transform(translate·rotate)으로만 움직인다
.hero-a__orb {
  position: absolute;
  width: 46%;
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(28px);
  opacity: .85;
}
.hero-a__orb--1 { background: radial-gradient($color 0%, $color 35%, transparent 68%); top: -10%; left: 4%; animation: driftA $duration $easing infinite; }
.hero-a__orb--2 { background: radial-gradient($stage-yellow 0%, $stage-yellow 35%, transparent 68%); bottom: -14%; right: 0%; animation: driftB $duration $easing infinite; animation-delay: -.6s; }
.hero-a__orb--3 { background: radial-gradient($stage-orange 0%, $stage-orange 35%, transparent 68%); top: 26%; right: 26%; animation: driftC $duration $easing infinite; animation-delay: -1.2s; }

// 그레인 — 정지 텍스처. 프레임마다 안 바뀐다 (움직이는 건 오브 하나)
.hero-a::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .35;
  mix-blend-mode: overlay;
  background-image:
    radial-gradient(rgba($stage-paper, .6) .5px, transparent .5px),
    radial-gradient(rgba($stage-ink, .6) .5px, transparent .5px);
  background-size: 3px 3px, 5px 5px;
  background-position: 0 0, 1px 2px;
  border-radius: inherit;
}

.hero-a__eyebrow { position: relative; z-index: 1; margin: 0; color: $stage-yellow; font: 700 clamp(10px, 2.4vw, 12px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif; letter-spacing: .06em; text-transform: uppercase; }
.hero-a__title { position: relative; z-index: 1; margin: 0; color: $stage-paper; font: 700 clamp(16px, 4.2vw, 20px)/1.25 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif; }
.hero-a__cta { position: relative; z-index: 1; align-self: flex-start; border: 0; border-radius: $r-pill; background: $subject-cream; color: $stage-ink; padding: $sp-2 $sp-5; font-weight: 700; font-size: clamp(11px, 2.6vw, 13px); line-height: 1; }

@keyframes driftA { 0% { transform: translate(0,0) rotate(0deg); } 50% { transform: translate(22px, 16px) rotate(20deg); } 100% { transform: translate(0,0) rotate(0deg); } }
@keyframes driftB { 0% { transform: translate(0,0) rotate(0deg); } 50% { transform: translate(-24px, -14px) rotate(-18deg); } 100% { transform: translate(0,0) rotate(0deg); } }
@keyframes driftC { 0% { transform: translate(0,0) rotate(0deg); } 50% { transform: translate(18px, -20px) rotate(16deg); } 100% { transform: translate(0,0) rotate(0deg); } }

@media (prefers-reduced-motion: reduce) {
  .hero-a__orb { 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);
}

.hero-a {
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
  width: clamp(260px, 84vw, 400px);
  min-height: clamp(172px, 48vw, 220px);
  border-radius: 16px;
  background: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
}

.hero-a__orb {
  position: absolute;
  width: 46%;
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(28px);
  opacity: 0.85;
}

.hero-a__orb--1 {
  background: radial-gradient(#2f6df6 0%, #2f6df6 35%, transparent 68%);
  top: -10%;
  left: 4%;
  animation: driftA 2s steps(4, jump-none) infinite;
}

.hero-a__orb--2 {
  background: radial-gradient(#ffd23f 0%, #ffd23f 35%, transparent 68%);
  bottom: -14%;
  right: 0%;
  animation: driftB 2s steps(4, jump-none) infinite;
  animation-delay: -0.6s;
}

.hero-a__orb--3 {
  background: radial-gradient(#ff4d1f 0%, #ff4d1f 35%, transparent 68%);
  top: 26%;
  right: 26%;
  animation: driftC 2s steps(4, jump-none) infinite;
  animation-delay: -1.2s;
}

.hero-a::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  mix-blend-mode: overlay;
  background-image: radial-gradient(rgba(255, 255, 255, 0.6) 0.5px, transparent 0.5px), radial-gradient(rgba(23, 20, 26, 0.6) 0.5px, transparent 0.5px);
  background-size: 3px 3px, 5px 5px;
  background-position: 0 0, 1px 2px;
  border-radius: inherit;
}

.hero-a__eyebrow {
  position: relative;
  z-index: 1;
  margin: 0;
  color: #ffd23f;
  font: 700 clamp(10px, 2.4vw, 12px)/1 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.hero-a__title {
  position: relative;
  z-index: 1;
  margin: 0;
  color: #ffffff;
  font: 700 clamp(16px, 4.2vw, 20px)/1.25 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.hero-a__cta {
  position: relative;
  z-index: 1;
  align-self: flex-start;
  border: 0;
  border-radius: 999px;
  background: #fff7e6;
  color: #17141a;
  padding: 8px 20px;
  font-weight: 700;
  font-size: clamp(11px, 2.6vw, 13px);
  line-height: 1;
}

@keyframes driftA {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(22px, 16px) rotate(20deg);
  }
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
}
@keyframes driftB {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(-24px, -14px) rotate(-18deg);
  }
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
}
@keyframes driftC {
  0% {
    transform: translate(0, 0) rotate(0deg);
  }
  50% {
    transform: translate(18px, -20px) rotate(16deg);
  }
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .hero-a__orb {
    animation: none;
  }
}

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

export type AuroraHeroProps = {
  eyebrow?: string;
  title?: 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 AuroraHero({
  eyebrow = "AURORA",
  title = "Manage subscribers from one screen",
  cta = "Start for free",
  duration = 2000,
  easing = "steps(4, jump-none)",
  color = "#2f6df6",
}: AuroraHeroProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <section className={styles.hero} style={vars}>
      <div className={`${styles.orb} ${styles.orb1}`} aria-hidden="true" />
      <div className={`${styles.orb} ${styles.orb2}`} aria-hidden="true" />
      <div className={`${styles.orb} ${styles.orb3}`} aria-hidden="true" />
      <p className={styles.eyebrow}>{eyebrow}</p>
      <h2 className={styles.title}>{title}</h2>
      <button type="button" className={styles.cta}>{cta}</button>
    </section>
  );
}