02Dual counter-rotating ring

<main class="stage">
  <div class="spinner" role="status" aria-label="Loading">
    <span class="spinner__ring spinner__ring--outer" aria-hidden="true"></span>
    <span class="spinner__ring spinner__ring--inner" aria-hidden="true"></span>
  </div>
</main>

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

$duration-outer: 1.2s;                            // 바깥 링 한 바퀴
$duration-inner: .9s;                             // 안쪽 링 한 바퀴 (역방향)
$color: $subject-ink;                             // 바깥 링 색

@include stage($stage-yellow);

.spinner {
  position: relative;
  width: clamp(56px, 16vw, 84px);
  height: clamp(56px, 16vw, 84px);
}
.spinner__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 5px solid transparent;
}
.spinner__ring--outer {
  border-top-color: $color;
  border-bottom-color: $color;
  animation: spin $duration-outer linear infinite;
}
.spinner__ring--inner {
  inset: 13px;
  border-left-color: $subject-blue;
  border-right-color: $subject-blue;
  animation: spin-rev $duration-inner linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes spin-rev {
  to { transform: rotate(-360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .spinner__ring--outer, .spinner__ring--inner { 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);
}

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

.spinner__ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 5px solid transparent;
}

.spinner__ring--outer {
  border-top-color: #17141a;
  border-bottom-color: #17141a;
  animation: spin 1.2s linear infinite;
}

.spinner__ring--inner {
  inset: 13px;
  border-left-color: #2f6df6;
  border-right-color: #2f6df6;
  animation: spin-rev 0.9s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@keyframes spin-rev {
  to {
    transform: rotate(-360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .spinner__ring--outer, .spinner__ring--inner {
    animation: none;
  }
}

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

export type DualRingSpinnerProps = {
  /** 스피너 지름 (기본 68px) */
  size?: number;
  /** 바깥 링 한 바퀴 시간 (기본 1200ms) */
  durationOuter?: number;
  /** 안쪽 링 한 바퀴 시간, 역방향 (기본 900ms) */
  durationInner?: number;
  /** 바깥 링 색 */
  color?: string;
  /** 안쪽 링 색 */
  accent?: string;
  label?: string;
};

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

export default function DualRingSpinner({
  size = 68,
  durationOuter = 1200,
  durationInner = 900,
  color = "#17141a",
  accent = "#2f6df6",
  label = "Loading",
}: DualRingSpinnerProps) {
  const vars: Vars = {
    "--size": `${size}px`,
    "--duration-outer": `${durationOuter}ms`,
    "--duration-inner": `${durationInner}ms`,
    "--color": color,
    "--accent": accent,
  };
  return (
    <div className={styles.spinner} style={vars} role="status" aria-label={label}>
      <span className={styles.outer} aria-hidden="true" />
      <span className={styles.inner} aria-hidden="true" />
    </div>
  );
}