08Heartbeat

<main class="stage">
  <div class="like">
    <span class="heart a-heartbeat" aria-hidden="true"></span>
    267 likes
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: 1.2s;
$easing: ease-in-out;
$color: $subject-blue;

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

.like {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: $stage-ink;
  font-weight: 700; font-size: clamp(15px, 4vw, 18px); line-height: 1; font-family: inherit;
}

// 순수 CSS 하트 — 원 두 개 + 45도 회전한 사각형
.heart {
  position: relative;
  display: inline-block;
  width: 34px;
  height: 30px;
  flex: none;
}
.heart::before,
.heart::after {
  content: "";
  position: absolute;
  top: 0;
  width: 18px;
  height: 28px;
  background: $color;
  border-radius: 18px 18px 0 0;
}
.heart::before { left: 17px; transform: rotate(-45deg); transform-origin: 0 100%; } // 규칙8: 하트반쪽 밑변꼭짓점 회전
.heart::after  { left: 0;    transform: rotate(45deg);  transform-origin: 100% 100%; } // 규칙8: 하트반쪽 밑변꼭짓점 회전

// ── .a-heartbeat 는 scale 을 두 번 짧게 튀우고 쉬어, 실제 심박처럼 불균등하다 ─
.a-heartbeat {
  animation: heartbeat $duration $easing infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  14%      { transform: scale(1.24); }
  28%      { transform: scale(1); }
  42%      { transform: scale(1.18); }
  70%      { transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .a-heartbeat { 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);
}

.like {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #17141a;
  font-weight: 700;
  font-size: clamp(15px, 4vw, 18px);
  line-height: 1;
  font-family: inherit;
}

.heart {
  position: relative;
  display: inline-block;
  width: 34px;
  height: 30px;
  flex: none;
}

.heart::before,
.heart::after {
  content: "";
  position: absolute;
  top: 0;
  width: 18px;
  height: 28px;
  background: #2f6df6;
  border-radius: 18px 18px 0 0;
}

.heart::before {
  left: 17px;
  transform: rotate(-45deg);
  transform-origin: 0 100%;
}

.heart::after {
  left: 0;
  transform: rotate(45deg);
  transform-origin: 100% 100%;
}

.a-heartbeat {
  animation: heartbeat 1.2s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% {
    transform: scale(1);
  }
  14% {
    transform: scale(1.24);
  }
  28% {
    transform: scale(1);
  }
  42% {
    transform: scale(1.18);
  }
  70% {
    transform: scale(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .a-heartbeat {
    animation: none;
  }
}

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

export type HeartbeatLikeProps = {
  children: ReactNode;
  /** 한 박자가 걸리는 시간 (기본 1200ms) */
  duration?: number;
  /** CSS easing (기본 ease-in-out) */
  easing?: string;
  /** 하트 색 */
  color?: string;
};

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

export default function HeartbeatLike({
  children,
  duration = 1200,
  easing = "ease-in-out",
  color = "#2f6df6",
}: HeartbeatLikeProps) {
  const vars: Vars = {
    "--duration": `${duration}ms`,
    "--easing": easing,
    "--color": color,
  };
  return (
    <div className={styles.like} style={vars}>
      <span className={styles.heart} aria-hidden="true" />
      {children}
    </div>
  );
}