04ゆらゆら揺れる

<main class="stage">
  <div class="tagwrap">
    <span class="tagwrap__string" aria-hidden="true"></span>
    <span class="tagwrap__tag o-yura">セール</span>
  </div>
  <span class="tag">ゆらゆら</span>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 2.4s;
$easing: ease-in-out;
$color: $subject-blue;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-paper);
.stage { position: relative; }

.tagwrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.tagwrap__string {
  width: 2px;
  height: 28px;
  background: $stage-ink;
  opacity: .4;
}
.tagwrap__tag {
  padding: $sp-3 $sp-6;
  border-radius: $r-sm;
  background: $stage-ink;
  color: $subject-cream;
  font-weight: 700;
  font-size: clamp(16px, 4.5vw, 20px);
  line-height: 1;
  font-family: inherit;
  box-shadow: $shadow-raised;
  transform-origin: top center; // 규칙8: 줄 매달림 top 피벗
}
.tag {
  position: absolute;
  top: $sp-4;
  right: $sp-4;
  padding: $sp-1 $sp-3;
  border-radius: $r-sm;
  background: rgba(23, 20, 26, .08);
  color: $stage-ink;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: .04em;
}

// ── transform-origin 을 위쪽에 고정하고 rotate 만 아주 천천히 오간다 ─────
.o-yura {
  animation: o-yura $duration $easing infinite;
  color: $color;
}
@keyframes o-yura {
  0%, 100% { transform: rotate(-6deg); }
  50%      { transform: rotate(6deg); }
}

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .o-yura { animation: none; }
}

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

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

.stage {
  position: relative;
}

.tagwrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.tagwrap__string {
  width: 2px;
  height: 28px;
  background: #17141a;
  opacity: 0.4;
}

.tagwrap__tag {
  padding: 12px 24px;
  border-radius: 8px;
  background: #17141a;
  color: #fff7e6;
  font-weight: 700;
  font-size: clamp(16px, 4.5vw, 20px);
  line-height: 1;
  font-family: inherit;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
  transform-origin: top center;
}

.tag {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  border-radius: 8px;
  background: rgba(23, 20, 26, 0.08);
  color: #17141a;
  font-weight: 700;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
}

.o-yura {
  animation: o-yura 2.4s ease-in-out infinite;
  color: #2f6df6;
}

@keyframes o-yura {
  0%, 100% {
    transform: rotate(-6deg);
  }
  50% {
    transform: rotate(6deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .o-yura {
    animation: none;
  }
}

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

export type SwayTagProps = {
  children: ReactNode;
  /** 한 번 오가는 데 걸리는 시간 (기본 2400ms) */
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function SwayTag({
  children,
  duration = 2400,
  easing = "ease-in-out",
  color = "#2f6df6",
}: SwayTagProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.wrap}>
      <span className={styles.string} aria-hidden="true" />
      <span className={styles.tag} style={vars}>
        {children}
      </span>
    </div>
  );
}