02Mesh gradient drift

<main class="stage">
  <span class="blob b1" aria-hidden="true"></span>
  <span class="blob b2" aria-hidden="true"></span>
  <span class="blob b3" aria-hidden="true"></span>
  <p class="hint">SaaS landing</p>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-loop;                                // 얼룩 하나가 경로를 한 바퀴 도는 시간
$easing: $ease-spring;
$color: $subject-blue;                                // 얼룩 색 하나

// ── 데모 무대 ──────────────────────────────────────────
@include stage($stage-yellow);

.stage {
  position: relative;
  overflow: hidden;
}

// 서로 다른 색의 radial-gradient 얼룩 세 개를 겹치고, transform 으로만 각자 다른 경로를 돈다
.blob {
  position: absolute;
  width: 42%;
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(12px);
  opacity: .9;
}

.b1 { background: radial-gradient($color, transparent 65%); top: -8%; left: -6%; animation: drift1 $duration $easing infinite; }
.b2 { background: radial-gradient($subject-cream, transparent 65%); bottom: -12%; right: -4%; animation: drift2 $duration $easing infinite; animation-delay: -.6s; }
.b3 { background: radial-gradient($stage-ink, transparent 65%); top: 28%; right: 22%; opacity: .65; animation: drift3 $duration $easing infinite; animation-delay: -1.2s; }

@keyframes drift1 { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(48px, 32px); } }
@keyframes drift2 { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(-42px, -26px); } }
@keyframes drift3 { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(24px, -38px); } }

.hint {
  position: relative;
  margin: 0;
  padding: 10px 20px;
  border-radius: $r-pill;
  background: rgba($stage-ink, .15);
  color: $stage-ink;
  font: 700 clamp(14px, 4vw, 18px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .blob { animation: none; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.stage {
  position: relative;
  overflow: hidden;
}

.blob {
  position: absolute;
  width: 42%;
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(12px);
  opacity: 0.9;
}

.b1 {
  background: radial-gradient(#2f6df6, transparent 65%);
  top: -8%;
  left: -6%;
  animation: drift1 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.b2 {
  background: radial-gradient(#fff7e6, transparent 65%);
  bottom: -12%;
  right: -4%;
  animation: drift2 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
  animation-delay: -0.6s;
}

.b3 {
  background: radial-gradient(#17141a, transparent 65%);
  top: 28%;
  right: 22%;
  opacity: 0.65;
  animation: drift3 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
  animation-delay: -1.2s;
}

@keyframes drift1 {
  0%, 100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(48px, 32px);
  }
}
@keyframes drift2 {
  0%, 100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(-42px, -26px);
  }
}
@keyframes drift3 {
  0%, 100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(24px, -38px);
  }
}
.hint {
  position: relative;
  margin: 0;
  padding: 10px 20px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.15);
  color: #17141a;
  font: 700 clamp(14px, 4vw, 18px)/1.3 -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  .blob {
    animation: none;
  }
}

import type { CSSProperties, ReactNode } from "react";
import styles from "./MeshGradientBg.module.scss";

export type MeshGradientBgProps = {
  children?: ReactNode;
  /** 얼룩 하나가 경로를 한 바퀴 도는 시간 (기본 2000ms) */
  duration?: number;
  easing?: string;
  /** 얼룩 색 하나 */
  color?: string;
  className?: string;
};

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

export default function MeshGradientBg({
  children,
  duration = 2000,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
  className = "",
}: MeshGradientBgProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  return (
    <div className={`${styles.stage} ${className}`} style={vars}>
      <span className={`${styles.blob} ${styles.b1}`} aria-hidden="true" />
      <span className={`${styles.blob} ${styles.b2}`} aria-hidden="true" />
      <span className={`${styles.blob} ${styles.b3}`} aria-hidden="true" />
      {children}
    </div>
  );
}