09AI-app style pulse orb

<main class="stage">
  <div class="orb" role="status" aria-label="Preparing a response"></div>
</main>

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

$duration: $dur-loop;                             // 펄스 한 사이클 (2초)
$easing: ease-in-out;
$color: $subject-blue;                            // 구체 안쪽 색

@include stage($stage-ink);

.orb {
  position: relative;
  width: clamp(56px, 16vw, 84px);
  height: clamp(56px, 16vw, 84px);
}
.orb::before {
  content: "";
  position: absolute;
  inset: -30%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba($color, .55), transparent 70%);
  filter: blur(6px);
  animation: glow $duration $easing infinite;
}
.orb::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, $subject-cream, $color 75%);
  animation: core $duration $easing infinite;
}

@keyframes core {
  0%, 100% { transform: scale(.88); opacity: .88; }
  50%      { transform: scale(1.08); opacity: 1; }
}
@keyframes glow {
  0%, 100% { transform: scale(.8); opacity: .35; }
  50%      { transform: scale(1.25); opacity: .65; }
}

@media (prefers-reduced-motion: reduce) {
  .orb::before, .orb::after { animation: none; transform: scale(1); opacity: .75; }
}

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);
}

.orb {
  position: relative;
  width: clamp(56px, 16vw, 84px);
  height: clamp(56px, 16vw, 84px);
}

.orb::before {
  content: "";
  position: absolute;
  inset: -30%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 109, 246, 0.55), transparent 70%);
  filter: blur(6px);
  animation: glow 2s ease-in-out infinite;
}

.orb::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff7e6, #2f6df6 75%);
  animation: core 2s ease-in-out infinite;
}

@keyframes core {
  0%, 100% {
    transform: scale(0.88);
    opacity: 0.88;
  }
  50% {
    transform: scale(1.08);
    opacity: 1;
  }
}
@keyframes glow {
  0%, 100% {
    transform: scale(0.8);
    opacity: 0.35;
  }
  50% {
    transform: scale(1.25);
    opacity: 0.65;
  }
}
@media (prefers-reduced-motion: reduce) {
  .orb::before, .orb::after {
    animation: none;
    transform: scale(1);
    opacity: 0.75;
  }
}

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

export type PulseOrbProps = {
  /** 오브 지름 (기본 68px) */
  size?: number;
  /** 펄스 한 사이클 시간 (기본 2000ms) */
  duration?: number;
  /** 구체 안쪽 색 */
  color?: string;
  label?: string;
};

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

export default function PulseOrb({
  size = 68,
  duration = 2000,
  color = "#2f6df6",
  label = "Preparing a response",
}: PulseOrbProps) {
  const vars: Vars = {
    "--size": `${size}px`,
    "--duration": `${duration}ms`,
    "--color": color,
  };
  return <div className={styles.orb} style={vars} role="status" aria-label={label} />;
}