02대기 시간 값이 늘어날수록 숨쉬듯 커지는 오브 펄스

<main class="stage">
<div class="ld" id="ld">
  <p class="ld__hint">
    <svg class="ld__ico" viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M232 56v56a8 8 0 0 1-16 0V91.3l-25.6 25.7A80 80 0 1 1 174 60a8 8 0 1 1-9 13.2A64 64 0 1 0 179.7 128H216a8 8 0 0 1 0 16h-56a8 8 0 0 1-8-8V80a8 8 0 0 1 16 0v20.7L192.7 76A80.1 80.1 0 0 0 64 128a8 8 0 0 1-16 0a96 96 0 0 1 163.6-68.3L224 71.3V56a8 8 0 0 1 8 8" opacity=".2"/><path d="M224 48a8 8 0 0 0-8 8v15.3l-11.7-11.6a96 96 0 1 0 27.6 51.6a8 8 0 0 0-15.8 2.5a80 80 0 1 1-23-43l-25.7 25.7A8 8 0 0 0 173 112h56a8 8 0 0 0 8-8V56a8 8 0 0 0-13-8"/></g></svg>
    <span>클릭하거나 스페이스바를 누르면 멈추거나 다시 갑니다</span>
  </p>
  <div class="ld__field" id="field" role="application" aria-label="오브 숨쉬기 펄스 실험판" tabindex="0">
    <div class="ld__orb" id="orb"></div>
    <b class="ld__badge" aria-hidden="true"><span class="ld__badgeNum" id="pct">0%</span><span class="ld__badgeUnit">대기</span></b>
  </div>
</div>
</main>

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

// orb-morph-pulse — 대기 시간 값을 사인 이징에 넣어 중심 오브 크기·블러를 숨쉬듯 반복시키고,
// 대기 시간 값이 쌓일수록(accum) 숨쉬는 폭(amp) 자체가 조금씩 커진다. @keyframes 없음 — rAF 전용.

$duration: $dur-loop;
$easing: $ease-spring;
$color: $subject-ink;

@include stage($stage-yellow);

.ld {
  display: flex; flex-direction: column; gap: $sp-2;
  width: 100%; max-width: 424px;
}

.ld__hint {
  display: flex; align-items: center; gap: $sp-1; margin: 0;
  font-weight: 700; font-size: clamp(10px, 2.8vw, 12px); line-height: 1.35;
  color: $subject-ink;
}
.ld__ico { width: 16px; height: 16px; flex: 0 0 auto; color: $subject-blue-deep; }

.ld__field {
  position: relative; height: 208px;
  display: flex; align-items: center; justify-content: center;
  border-radius: $r-card; overflow: hidden;
  background: rgba($subject-ink, .06);
  box-shadow: inset 0 0 0 1px rgba($subject-ink, .16);
  cursor: pointer;
}
.ld__field:focus-visible { outline: 2px solid $subject-blue-deep; outline-offset: 2px; }

.ld__orb {
  --scale: 1; --blur: 12px; --glow: .35;
  width: 108px; height: 108px; border-radius: $r-pill;
  background: radial-gradient(circle at 38% 34%, $subject-blue-light, $subject-blue-deep 70%);
  transform: scale(var(--scale));
  filter: blur(calc(var(--blur) * .18));
  box-shadow: 0 0 42px calc(var(--glow) * 60px) rgba($subject-blue-deep, var(--glow));
}

.ld__badge {
  position: absolute; right: $sp-2; top: $sp-2;
  display: flex; align-items: baseline; gap: $sp-1;
  padding: $sp-1 $sp-2; border-radius: $r-pill;
  background: rgba($subject-ink, .82);
  color: $subject-cream; font-weight: 700; font-size: 11px;
}
.ld__badgeNum { font-size: 13px; color: $stage-yellow; }
.ld__badgeUnit { font-weight: 700; }

@media (max-width: 340px) {
  .ld { gap: $sp-1; }
  .ld__field { height: 124px; }
  .ld__orb { width: 64px; height: 64px; }
  .ld__badge { font-size: 10px; padding: 0 $sp-1; }
  .ld__badgeNum { font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  .ld.is-still .ld__field { cursor: default !important; }
  .ld.is-still .ld__badge { opacity: .92 !important; }
}

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);
}

.ld {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  max-width: 424px;
}

.ld__hint {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  font-weight: 700;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.35;
  color: #17141a;
}

.ld__ico {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  color: #0a4fe8;
}

.ld__field {
  position: relative;
  height: 208px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  overflow: hidden;
  background: rgba(23, 20, 26, 0.06);
  box-shadow: inset 0 0 0 1px rgba(23, 20, 26, 0.16);
  cursor: pointer;
}

.ld__field:focus-visible {
  outline: 2px solid #0a4fe8;
  outline-offset: 2px;
}

.ld__orb {
  --scale: 1;
  --blur: 12px;
  --glow: .35;
  width: 108px;
  height: 108px;
  border-radius: 999px;
  background: radial-gradient(circle at 38% 34%, #5b8cf8, #0a4fe8 70%);
  transform: scale(var(--scale));
  filter: blur(calc(var(--blur) * 0.18));
  box-shadow: 0 0 42px calc(var(--glow) * 60px) rgba(10, 79, 232, var(--glow));
}

.ld__badge {
  position: absolute;
  right: 8px;
  top: 8px;
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.82);
  color: #fff7e6;
  font-weight: 700;
  font-size: 11px;
}

.ld__badgeNum {
  font-size: 13px;
  color: #ffd23f;
}

.ld__badgeUnit {
  font-weight: 700;
}

@media (max-width: 340px) {
  .ld {
    gap: 4px;
  }
  .ld__field {
    height: 124px;
  }
  .ld__orb {
    width: 64px;
    height: 64px;
  }
  .ld__badge {
    font-size: 10px;
    padding: 0 4px;
  }
  .ld__badgeNum {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .ld.is-still .ld__field {
    cursor: default !important;
  }
  .ld.is-still .ld__badge {
    opacity: 0.92 !important;
  }
}

(function () {
  var LOOP = 2.0;
  var BREATH_HZ = 0.9;       // 숨쉬기 사인 진동수
  var AMP_BASE = 0.10;       // 숨쉬는 폭 시작 값
  var AMP_GROW = 0.09;       // 대기 시간 값이 쌓이며 늘어나는 폭
  var root = document.getElementById('ld');
  var field = document.getElementById('field');
  var orb = document.getElementById('orb');
  var pctEl = document.getElementById('pct');
  var paused = false;
  var t0 = performance.now();
  var raf = 0;

  function reduced() {
    return window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  }
  function easeSine(t) { return 0.5 - 0.5 * Math.cos(t * Math.PI); }

  function draw(sec) {
    var t = sec % LOOP;
    var accum = Math.min(sec, LOOP) / LOOP;      // 대기 시간 값이 쌓인 정도(0~1)
    var amp = AMP_BASE + AMP_GROW * easeSine(accum);
    var wave = Math.sin(t * Math.PI * 2 * BREATH_HZ);
    var scale = 1 + amp * wave;
    var blur = 12 + 9 * Math.max(0, wave);
    var glow = 0.35 + 0.25 * Math.max(0, wave);

    orb.style.setProperty('--scale', scale.toFixed(4));
    orb.style.setProperty('--blur', blur.toFixed(1) + 'px');
    orb.style.setProperty('--glow', glow.toFixed(3));

    var pct = Math.round((t / LOOP) * 100);
    pctEl.textContent = pct + '%';
  }

  function togglePause() {
    paused = !paused;
    root.classList.toggle('is-paused', paused);
  }
  function restart() { t0 = performance.now(); draw(0); }
  function onKey(e) {
    if (e.key === ' ' || e.key === 'Enter') { e.preventDefault(); togglePause(); }
    else if (e.key === 'r' || e.key === 'R') { e.preventDefault(); restart(); }
  }
  field.addEventListener('click', togglePause);
  field.addEventListener('keydown', onKey);

  function onResize() {
    if (paused || reduced()) draw((performance.now() - t0) / 1000);
  }
  window.addEventListener('resize', onResize);

  function frame(now) {
    if (!paused) draw((now - t0) / 1000);
    raf = requestAnimationFrame(frame);
  }

  if (reduced()) {
    root.classList.add('is-still');
    draw(LOOP * 0.62);
  } else {
    raf = requestAnimationFrame(frame);
  }
})();

// OrbPulse — vanilla 판(run/403/demo/02-ai-processing-loading-orb-morph-pulse/index.html) 의 React 포트.
// 대기 시간 값을 사인 이징에 넣어 오브 크기·블러를 숨쉬듯 반복시키고, 대기 시간이 쌓일수록 폭이 커진다.
import { useEffect, useRef } from "react";
import type { CSSProperties } from "react";
import styles from "./OrbPulse.module.scss";

export type OrbPulseProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type Box<T> = { current: T };
type KeyEvt = { key: string; preventDefault(): void };

const LOOP = 2.0;
const BREATH_HZ = 0.9;
const AMP_BASE = 0.10;
const AMP_GROW = 0.09;
const FIELD_LABEL = "오브 숨쉬기 펄스 실험판";

function easeSine(t: number): number { return 0.5 - 0.5 * Math.cos(t * Math.PI); }

export default function OrbPulse({
  duration = "2s",
  easing = "cubic-bezier(.2, .8, .2, 1)",
  color = "#17141a",
}: OrbPulseProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);
  const fieldRef = useRef<HTMLDivElement | null>(null);
  const orbRef = useRef<HTMLDivElement | null>(null);
  const pctRef = useRef<HTMLSpanElement | null>(null);
  const pausedRef = useRef(false) as Box<boolean>;
  const t0Ref = useRef(0) as Box<number>;
  const rafRef = useRef(0) as Box<number>;
  const vars: Vars = { "--duration": duration, "--easing": easing, "--color": color };

  function reduced(): boolean {
    return window.matchMedia("(prefers-reduced-motion: reduce)").matches;
  }

  function draw(sec: number): void {
    const orb = orbRef.current;
    const pctEl = pctRef.current;
    if (!orb) return;
    const t = sec % LOOP;
    const accum = Math.min(sec, LOOP) / LOOP;
    const amp = AMP_BASE + AMP_GROW * easeSine(accum);
    const wave = Math.sin(t * Math.PI * 2 * BREATH_HZ);
    const scale = 1 + amp * wave;
    const blur = 12 + 9 * Math.max(0, wave);
    const glow = 0.35 + 0.25 * Math.max(0, wave);

    orb.style.setProperty("--scale", scale.toFixed(4));
    orb.style.setProperty("--blur", blur.toFixed(1) + "px");
    orb.style.setProperty("--glow", glow.toFixed(3));

    if (pctEl) pctEl.textContent = Math.round((t / LOOP) * 100) + "%";
  }

  function togglePause(): void {
    pausedRef.current = !pausedRef.current;
    const root = rootRef.current;
    if (root) root.classList.toggle("is-paused", pausedRef.current);
  }
  function restart(): void { t0Ref.current = performance.now(); draw(0); }
  function onKey(e: KeyEvt): void {
    if (e.key === " " || e.key === "Enter") { e.preventDefault(); togglePause(); }
    else if (e.key === "r" || e.key === "R") { e.preventDefault(); restart(); }
  }
  function onClick(): void { togglePause(); }
  function onResize(): void {
    if (pausedRef.current || reduced()) draw((performance.now() - t0Ref.current) / 1000);
  }
  function frame(now: number): void {
    if (!pausedRef.current) draw((now - t0Ref.current) / 1000);
    rafRef.current = requestAnimationFrame(frame);
  }

  useEffect(() => {
    const root = rootRef.current;
    if (!root) return;
    t0Ref.current = performance.now();
    window.addEventListener("resize", onResize);
    if (reduced()) {
      root.classList.add("is-still");
      draw(LOOP * 0.62);
    } else {
      rafRef.current = requestAnimationFrame(frame);
    }
    return () => {
      window.removeEventListener("resize", onResize);
      cancelAnimationFrame(rafRef.current);
    };
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.root} ref={rootRef} style={vars}>
        <p className={styles.hint}>
          <svg className={styles.ico} viewBox="0 0 256 256" aria-hidden="true"><g fill="currentColor"><path d="M232 56v56a8 8 0 0 1-16 0V91.3l-25.6 25.7A80 80 0 1 1 174 60a8 8 0 1 1-9 13.2A64 64 0 1 0 179.7 128H216a8 8 0 0 1 0 16h-56a8 8 0 0 1-8-8V80a8 8 0 0 1 16 0v20.7L192.7 76A80.1 80.1 0 0 0 64 128a8 8 0 0 1-16 0a96 96 0 0 1 163.6-68.3L224 71.3V56a8 8 0 0 1 8 8" opacity=".2"/><path d="M224 48a8 8 0 0 0-8 8v15.3l-11.7-11.6a96 96 0 1 0 27.6 51.6a8 8 0 0 0-15.8 2.5a80 80 0 1 1-23-43l-25.7 25.7A8 8 0 0 0 173 112h56a8 8 0 0 0 8-8V56a8 8 0 0 0-13-8"/></g></svg>
          <span>클릭하거나 스페이스바를 누르면 멈추거나 다시 갑니다</span>
        </p>
        <div
          className={styles.field}
          ref={fieldRef}
          role="application"
          aria-label={FIELD_LABEL}
          tabIndex={0}
          onClick={onClick}
          onKeyDown={onKey}
        >
          <div className={styles.orb} ref={orbRef}></div>
          <b className={styles.badge} aria-hidden="true"><span className={styles.badgeNum} ref={pctRef}>0%</span><span className={styles.badgeUnit}>대기</span></b>
        </div>
      </div>
    </main>
  );
}