08Date divider appear

<main class="stage">
  <div class="thread">
    <span class="divider is-demo">Today</span>
    <div class="bubble">Good morning</div>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────────
$duration: $dur-base;      // 구분선이 내려와 자리잡는 데 걸리는 시간
$easing: $ease-out;
$color: $subject-blue;     // 뒤이은 말풍선 색 (paper 무대라 blue)

@include stage($stage-paper);

.thread { display: grid; gap: 14px; justify-items: center; }
.divider {
  padding: 6px 16px;
  border-radius: $r-pill;
  background: rgba($stage-ink, .08);
  color: rgba($stage-ink, .6);
  font-weight: 700; font-size: clamp(11px, 3.2vw, 12px); line-height: 1; font-family: inherit;
  letter-spacing: .04em;
  transform-origin: center;

  &.is-demo { animation: divider-in-loop $dur-loop $easing infinite; }
}
.bubble {
  padding: 16px 26px;
  border-radius: $r-card;
  background: $color;
  color: #fff;
  font-weight: 600; font-size: clamp(15px, 4.6vw, 18px); line-height: 1.4; font-family: inherit;
}

// 구분선이 위에서 살짝 내려오며 옅게 나타나고, 다음 주기를 위해 다시 사라진다
@keyframes divider-in-loop {
  0%   { transform: translateY(-14px) scale(.9); opacity: 0; }
  20%  { transform: translateY(0) scale(1); opacity: 1; }
  82%  { transform: translateY(0) scale(1); opacity: 1; }
  100% { transform: translateY(-14px) scale(.9); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .divider.is-demo { animation: none !important; transform: none; opacity: 1; }
}

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);
}

.thread {
  display: grid;
  gap: 14px;
  justify-items: center;
}

.divider {
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.08);
  color: rgba(23, 20, 26, 0.6);
  font-weight: 700;
  font-size: clamp(11px, 3.2vw, 12px);
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
  transform-origin: center;
}
.divider.is-demo {
  animation: divider-in-loop 2s ease-out infinite;
}

.bubble {
  padding: 16px 26px;
  border-radius: 16px;
  background: #2f6df6;
  color: #fff;
  font-weight: 600;
  font-size: clamp(15px, 4.6vw, 18px);
  line-height: 1.4;
  font-family: inherit;
}

@keyframes divider-in-loop {
  0% {
    transform: translateY(-14px) scale(0.9);
    opacity: 0;
  }
  20% {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
  82% {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
  100% {
    transform: translateY(-14px) scale(0.9);
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .divider.is-demo {
    animation: none !important;
    transform: none;
    opacity: 1;
  }
}

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

export type DateDividerAppearProps = {
  children: ReactNode;
  /** 구분선이 내려와 자리잡는 데 걸리는 시간 (기본 300ms) */
  duration?: number;
  easing?: string;
  className?: string;
};

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

export default function DateDividerAppear({
  children,
  duration = 300,
  easing = "ease-out",
  className = "",
}: DateDividerAppearProps) {
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing };

  return (
    <span className={`${styles.divider} ${styles.enter} ${className}`} style={vars}>
      {children}
    </span>
  );
}