04Brand mark splash that breathes on the very first entry

<main class="stage">
  <section class="sp is-demo" id="sp" aria-label="First run splash">
    <div class="sp__mark" aria-hidden="true">
      <span class="sp__disc"></span>
      <span class="sp__box"></span>
    </div>
    <p class="sp__dots" aria-hidden="true">
      <span class="sp__dot"></span><span class="sp__dot"></span><span class="sp__dot"></span>
    </p>
    <p class="sp__msg" id="sp-msg" aria-live="polite">Getting your first screen ready</p>
    <button class="sp__enter" type="button" id="sp-enter">Go in without waiting</button>
  </section>
</main>

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

// 첫 진입 스플래시 — 동그라미와 사각형으로 만든 브랜드 마크가 transform: scale 로 천천히 부풀었다 줄고,
// 그 아래 점 셋이 animation-delay 로 차례를 넘긴다.
// 루프에서 스플래시가 걷히는 장면은 재현하지 않는다 — 퇴장 프레임이 대표 이미지로 뽑히면 빈 화면만 남는다.
// 걷히는 건 버튼을 눌러 .is-ready 가 붙었을 때뿐이다.
$duration: $dur-enter;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-paper);

.sp {
  box-sizing: border-box;
  display: grid;
  justify-items: center;
  gap: $sp-3;
  width: min(272px, 92vw);
  color: $subject-ink;
  text-align: center;
}
.sp * { box-sizing: border-box; }

// ── 브랜드 마크: 아이콘이 아니라 도형 둘(원 + 사각형)의 조합이다 ──
.sp__mark {
  position: relative;
  width: 60px;
  height: 60px;
  transform: scale(1);            // 정적 상태의 기준 크기 — 루프가 이 값을 흔든다
  transition: transform $duration $easing;   // 준비가 끝나면 부풀던 마크가 기준 크기로 내려앉는다
}
.sp__disc {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: $color;
}
.sp__box {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 24px;
  height: 24px;
  border-radius: $r-xs;
  background: $subject-ink;
  box-shadow: 0 0 0 4px $stage-paper;   // 무대 색으로 테를 둘러 원과 떨어져 보이게
}

// ── 준비 중 표시: 점 셋이 차례를 넘긴다 ──
.sp__dots {
  display: flex;
  gap: $sp-2;
  margin: 0;
  padding: 0;
}
.sp__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: $color;
  opacity: .35;                   // 정적 상태에서도 점이 보인다
}

.sp__msg {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
}

.sp__enter {
  margin: 0;
  padding: $sp-2 $sp-4;
  border: 2px solid $subject-ink;
  border-radius: $r-pill;
  background: none;
  color: $subject-ink;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: transform $dur-instant $easing;
}
.sp__enter:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.sp__enter:active { transform: scale(.96); }
.sp__enter[disabled] { opacity: .4; cursor: default; }

// 준비가 끝난 상태 — 맥박도 점도 멈추고 마크만 남는다
.sp.is-ready .sp__dots { visibility: hidden; }
.sp.is-ready .sp__mark { transform: scale(1); }

// ── 격자 미리보기 전용 2초 루프 ──
@keyframes sp-breath {
  0% { transform: scale(1); }
  44% { transform: scale(1.1); }
  88%, 100% { transform: scale(1); }
}
@keyframes sp-dot {
  0%, 10% { transform: translateY(0); opacity: .35; }
  22% { transform: translateY(-7px); opacity: 1; }
  40%, 100% { transform: translateY(0); opacity: .35; }
}

.sp.is-demo {
  .sp__mark {
    animation-name: sp-breath;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  // 지연이 걸린 애니메이션은 backwards 가 없으면 첫 프레임에 기본 상태로 한 번 번쩍인다
  .sp__dot {
    animation-name: sp-dot;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
    animation-fill-mode: backwards;
  }
  .sp__dot:nth-child(1) { animation-delay: 0ms; }
  .sp__dot:nth-child(2) { animation-delay: 200ms; }
  .sp__dot:nth-child(3) { animation-delay: 400ms; }
}

@media (max-width: 340px) {
  .sp { gap: $sp-2; width: min(232px, 96vw); }
  .sp__mark { width: 44px; height: 44px; }
  .sp__box { width: 18px; height: 18px; }
  .sp__dot { width: 6px; height: 6px; }
  .sp__msg { font-size: 12px; }
  .sp__enter { padding: $sp-1 $sp-3; font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  .sp.is-demo .sp__mark,
  .sp.is-demo .sp__dot { animation: none !important; }
  // 움직임만 끄고 "준비 중" 이라는 결과 상태는 남긴다
  .sp.is-demo .sp__mark { transform: scale(1) !important; }
  .sp.is-demo .sp__dot { transform: none !important; opacity: .35 !important; }
  .sp__mark,
  .sp__enter { transition: none !important; }
}

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);
}

.sp {
  box-sizing: border-box;
  display: grid;
  justify-items: center;
  gap: 12px;
  width: min(272px, 92vw);
  color: #17141a;
  text-align: center;
}

.sp * {
  box-sizing: border-box;
}

.sp__mark {
  position: relative;
  width: 60px;
  height: 60px;
  transform: scale(1);
  transition: transform 600ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sp__disc {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: #2f6df6;
}

.sp__box {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 24px;
  height: 24px;
  border-radius: 4px;
  background: #17141a;
  box-shadow: 0 0 0 4px #ffffff;
}

.sp__dots {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
}

.sp__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #2f6df6;
  opacity: 0.35;
}

.sp__msg {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
}

.sp__enter {
  margin: 0;
  padding: 8px 16px;
  border: 2px solid #17141a;
  border-radius: 999px;
  background: none;
  color: #17141a;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: transform 140ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.sp__enter:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.sp__enter:active {
  transform: scale(0.96);
}

.sp__enter[disabled] {
  opacity: 0.4;
  cursor: default;
}

.sp.is-ready .sp__dots {
  visibility: hidden;
}

.sp.is-ready .sp__mark {
  transform: scale(1);
}

@keyframes sp-breath {
  0% {
    transform: scale(1);
  }
  44% {
    transform: scale(1.1);
  }
  88%, 100% {
    transform: scale(1);
  }
}
@keyframes sp-dot {
  0%, 10% {
    transform: translateY(0);
    opacity: 0.35;
  }
  22% {
    transform: translateY(-7px);
    opacity: 1;
  }
  40%, 100% {
    transform: translateY(0);
    opacity: 0.35;
  }
}
.sp.is-demo .sp__mark {
  animation-name: sp-breath;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.sp.is-demo .sp__dot {
  animation-name: sp-dot;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
.sp.is-demo .sp__dot:nth-child(1) {
  animation-delay: 0ms;
}
.sp.is-demo .sp__dot:nth-child(2) {
  animation-delay: 200ms;
}
.sp.is-demo .sp__dot:nth-child(3) {
  animation-delay: 400ms;
}

@media (max-width: 340px) {
  .sp {
    gap: 8px;
    width: min(232px, 96vw);
  }
  .sp__mark {
    width: 44px;
    height: 44px;
  }
  .sp__box {
    width: 18px;
    height: 18px;
  }
  .sp__dot {
    width: 6px;
    height: 6px;
  }
  .sp__msg {
    font-size: 12px;
  }
  .sp__enter {
    padding: 4px 12px;
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sp.is-demo .sp__mark,
  .sp.is-demo .sp__dot {
    animation: none !important;
  }
  .sp.is-demo .sp__mark {
    transform: scale(1) !important;
  }
  .sp.is-demo .sp__dot {
    transform: none !important;
    opacity: 0.35 !important;
  }
  .sp__mark,
  .sp__enter {
    transition: none !important;
  }
}

// 스플래시: 준비가 끝나는 순간만 사람이 만든다. 루프는 마크의 맥박과 점 셋만 보여 준다.
var sp = document.getElementById('sp');
var spMsg = document.getElementById('sp-msg');
var spEnter = document.getElementById('sp-enter');
spEnter.addEventListener('click', function () {
  sp.classList.remove('is-demo');
  sp.classList.add('is-ready');
  spMsg.textContent = 'All set';
  spEnter.disabled = true;
});

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

export type LogoPulseSplashProps = {
  /** 준비 중 안내 — aria-live="polite" 영역에 들어간다 */
  message?: string;
  /** 버튼을 눌러 준비가 끝났을 때의 안내 */
  readyMessage?: string;
  enterLabel?: string;
  groupLabel?: string;
  /** 격자 미리보기용 2초 자동 루프. 사람이 버튼을 누르면 꺼진다 */
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function LogoPulseSplash({
  message = "Getting your first screen ready",
  readyMessage = "All set",
  enterLabel = "Go in without waiting",
  groupLabel = "First run splash",
  demo = true,
  duration = 600,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: LogoPulseSplashProps) {
  const [ready, setReady] = useState(false);

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  // 루프는 마크의 맥박과 점 셋만 돈다 — 스플래시가 걷히는 장면은 사람이 버튼을 눌렀을 때만 일어난다
  const cls = [styles.sp, demo && !ready ? styles.isDemo : "", ready ? styles.isReady : ""]
    .filter(Boolean)
    .join(" ");

  return (
    <section className={cls} style={vars} aria-label={groupLabel}>
      <div className={styles.mark} aria-hidden="true">
        <span className={styles.disc} />
        <span className={styles.box} />
      </div>
      <p className={styles.dots} aria-hidden="true">
        <span className={styles.dot} />
        <span className={styles.dot} />
        <span className={styles.dot} />
      </p>
      <p className={styles.msg} aria-live="polite">{ready ? readyMessage : message}</p>
      <button className={styles.enter} type="button" disabled={ready} onClick={() => setReady(true)}>
        {enterLabel}
      </button>
    </section>
  );
}