05埋まった行数の値が増える結果カードのストリーム読み込み

<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>クリックするかスペースバーを押すと一時停止または再開します</span>
  </p>
  <div class="ld__field" id="field" role="application" aria-label="カードコンテンツストリーム充填テストパネル" tabindex="0">
    <div class="ld__card">
      <div class="ld__cardHead"><i></i><i></i><i></i></div>
      <div class="ld__line" style="--w:86%" data-i="0"><b class="ld__lineFill"></b></div>
      <div class="ld__line" style="--w:64%" data-i="1"><b class="ld__lineFill"></b></div>
      <div class="ld__line" style="--w:92%" data-i="2"><b class="ld__lineFill"></b></div>
      <div class="ld__line" style="--w:58%" data-i="3"><b class="ld__lineFill"></b></div>
      <div class="ld__line" style="--w:78%" data-i="4"><b class="ld__lineFill"></b></div>
      <div class="ld__line" style="--w:46%" data-i="5"><b class="ld__lineFill"></b></div>
    </div>
    <b class="ld__badge" aria-hidden="true"><span class="ld__badgeNum" id="pct">0%</span><span class="ld__badgeUnit">充填</span></b>
  </div>
</div>
</main>

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

// card-content-stream-fill — 스켈레톤 줄마다 채워졌는지 여부를 값으로 두고, 그 값이 위에서부터
// 하나씩 참으로 바뀔 때마다 해당 줄만 실제 텍스트 톤으로 바뀐다. rAF 로 폭·색을 함께 보간 — @keyframes 없음.

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

@include stage($stage-ink);

.ld {
  --skeleton: #4a4550;
  --text-tone: #{$subject-blue-light};

  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-cream;
}
.ld__ico { width: 16px; height: 16px; flex: 0 0 auto; color: $subject-blue-light; }

.ld__field {
  position: relative; height: 208px;
  display: flex; align-items: center;
  border-radius: $r-card; overflow: hidden;
  background: $subject-ink;
  box-shadow: inset 0 0 0 1px rgba($subject-cream, .14);
  cursor: pointer;
  padding: 0 $sp-4;
}
.ld__field:focus-visible { outline: 2px solid $subject-blue-light; outline-offset: 2px; }

.ld__card {
  width: 100%; display: flex; flex-direction: column; gap: $sp-2;
}
.ld__cardHead {
  display: flex; gap: $sp-1; margin-bottom: $sp-1;
  i { width: 7px; height: 7px; border-radius: $r-pill; background: rgba($subject-cream, .3); display: block; }
}
.ld__line {
  position: relative; height: 10px; width: var(--w, 70%);
  border-radius: $r-xs;
  background: rgba($subject-cream, .12);
  overflow: hidden;
}
.ld__lineFill {
  display: block; height: 100%; width: 0%;
  border-radius: $r-xs;
  background: $subject-blue-light;
}
.ld__line.is-active { box-shadow: 0 0 0 1px rgba($subject-blue-light, .35); }

.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-cream, .12);
  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; padding: 0 $sp-2; }
  .ld__card { gap: $sp-1; }
  .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: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.ld {
  --skeleton: #4a4550;
  --text-tone: #5b8cf8;
  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: #fff7e6;
}

.ld__ico {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  color: #5b8cf8;
}

.ld__field {
  position: relative;
  height: 208px;
  display: flex;
  align-items: center;
  border-radius: 16px;
  overflow: hidden;
  background: #17141a;
  box-shadow: inset 0 0 0 1px rgba(255, 247, 230, 0.14);
  cursor: pointer;
  padding: 0 16px;
}

.ld__field:focus-visible {
  outline: 2px solid #5b8cf8;
  outline-offset: 2px;
}

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

.ld__cardHead {
  display: flex;
  gap: 4px;
  margin-bottom: 4px;
}
.ld__cardHead i {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: rgba(255, 247, 230, 0.3);
  display: block;
}

.ld__line {
  position: relative;
  height: 10px;
  width: var(--w, 70%);
  border-radius: 4px;
  background: rgba(255, 247, 230, 0.12);
  overflow: hidden;
}

.ld__lineFill {
  display: block;
  height: 100%;
  width: 0%;
  border-radius: 4px;
  background: #5b8cf8;
}

.ld__line.is-active {
  box-shadow: 0 0 0 1px rgba(91, 140, 248, 0.35);
}

.ld__badge {
  position: absolute;
  right: 8px;
  top: 8px;
  display: flex;
  align-items: baseline;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(255, 247, 230, 0.12);
  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;
    padding: 0 8px;
  }
  .ld__card {
    gap: 4px;
  }
  .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 LINE_MS = 0.24;   // 줄 시작 간격 — 줄마다 채워짐 값이 참이 되는 시각 간격
  var FILL_MS = 0.30;   // 줄 하나가 채워지는 데 걸리는 시간

  var root = document.getElementById('ld');
  var field = document.getElementById('field');
  var lines = Array.prototype.slice.call(document.querySelectorAll('.ld__line'));
  var fills = lines.map(function (l) { return l.querySelector('.ld__lineFill'); });
  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 clamp01(v) { return v < 0 ? 0 : v > 1 ? 1 : v; }
  function smooth(t) { return t * t * (3 - 2 * t); }
  function hexToRgb(hex) {
    var h = hex.replace('#', '').trim();
    if (h.length === 3) h = h[0] + h[0] + h[1] + h[1] + h[2] + h[2];
    var n = parseInt(h, 16);
    return [(n >> 16) & 255, (n >> 8) & 255, n & 255];
  }
  function mix(a, b, t) {
    return [Math.round(a[0] + (b[0] - a[0]) * t), Math.round(a[1] + (b[1] - a[1]) * t), Math.round(a[2] + (b[2] - a[2]) * t)];
  }
  function rgbStr(c) { return 'rgb(' + c[0] + ',' + c[1] + ',' + c[2] + ')'; }

  var cs = getComputedStyle(root);
  var SKELETON = hexToRgb(cs.getPropertyValue('--skeleton').trim());
  var TEXT = hexToRgb(cs.getPropertyValue('--text-tone').trim());

  function draw(sec) {
    var t = sec % LOOP;
    var doneCount = 0;
    for (var i = 0; i < lines.length; i++) {
      var local = t - i * LINE_MS;
      var raw = clamp01(local / FILL_MS);
      var eased = smooth(raw);
      fills[i].style.width = (eased * 100).toFixed(1) + '%';
      fills[i].style.background = rgbStr(mix(SKELETON, TEXT, eased));
      lines[i].classList.toggle('is-active', raw > 0 && raw < 1);
      if (raw >= 1) doneCount++;
    }
    pctEl.textContent = Math.round((doneCount / lines.length) * 100) + '%';
  }

  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);
  }
})();

// CardStream — vanilla 판(run/403/demo/05-ai-processing-loading-card-content-stream-fill/index.html) 의 React 포트.
// 스켈레톤 줄마다 채워졌는지 여부를 값으로 두고, 위에서부터 하나씩 참으로 바뀔 때마다
// 해당 줄만 실제 텍스트 톤으로 바뀐다. rAF 로 폭·색을 함께 보간 — @keyframes 없음.
import { useEffect, useRef } from "react";
import type { CSSProperties } from "react";
import styles from "./CardStream.module.scss";

export type CardStreamProps = {
  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 LINE_MS = 0.24;
const FILL_MS = 0.30;
const WIDTHS = [86, 64, 92, 58, 78, 46];
const FIELD_LABEL = "카드 스트림 채움 실험판";

function clamp01(v: number): number { return v < 0 ? 0 : v > 1 ? 1 : v; }
function smooth(t: number): number { return t * t * (3 - 2 * t); }
function hexToRgb(hex: string): [number, number, number] {
  let h = hex.replace("#", "").trim();
  if (h.length === 3) h = h[0] + h[0] + h[1] + h[1] + h[2] + h[2];
  const n = parseInt(h, 16);
  return [(n >> 16) & 255, (n >> 8) & 255, n & 255];
}
function mix(a: [number, number, number], b: [number, number, number], t: number): [number, number, number] {
  return [Math.round(a[0] + (b[0] - a[0]) * t), Math.round(a[1] + (b[1] - a[1]) * t), Math.round(a[2] + (b[2] - a[2]) * t)];
}
function rgbStr(c: [number, number, number]): string { return "rgb(" + c[0] + "," + c[1] + "," + c[2] + ")"; }

export default function CardStream({
  duration = "2s",
  easing = "cubic-bezier(.2, .8, .2, 1)",
  color = "#fff7e6",
}: CardStreamProps) {
  const rootRef = useRef<HTMLDivElement | null>(null);
  const fieldRef = useRef<HTMLDivElement | null>(null);
  const lineRefs = useRef<Array<HTMLDivElement | null>>([]) as Box<Array<HTMLDivElement | null>>;
  const fillRefs = useRef<Array<HTMLSpanElement | null>>([]) as Box<Array<HTMLSpanElement | 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 skeletonRef = useRef<[number, number, number]>([74, 69, 80]) as Box<[number, number, number]>;
  const textRef = useRef<[number, number, number]>([91, 140, 248]) as Box<[number, number, 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 pctEl = pctRef.current;
    const t = sec % LOOP;
    let doneCount = 0;
    for (let i = 0; i < WIDTHS.length; i++) {
      const local = t - i * LINE_MS;
      const raw = clamp01(local / FILL_MS);
      const eased = smooth(raw);
      const fillEl = fillRefs.current[i];
      const lineEl = lineRefs.current[i];
      if (fillEl) {
        fillEl.style.width = (eased * 100).toFixed(1) + "%";
        fillEl.style.background = rgbStr(mix(skeletonRef.current, textRef.current, eased));
      }
      if (lineEl) lineEl.classList.toggle(styles.isActive, raw > 0 && raw < 1);
      if (raw >= 1) doneCount++;
    }
    if (pctEl) pctEl.textContent = Math.round((doneCount / WIDTHS.length) * 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;
    const cs = getComputedStyle(root);
    skeletonRef.current = hexToRgb(cs.getPropertyValue("--skeleton").trim() || "#4a4550");
    textRef.current = hexToRgb(cs.getPropertyValue("--text-tone").trim() || "#5b8cf8");
    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.card}>
            <div className={styles.cardHead}><i></i><i></i><i></i></div>
            {WIDTHS.map((w, i) => (
              <div
                key={i}
                className={styles.line}
                style={{ "--w": w + "%" } as CSSProperties}
                ref={(el: HTMLDivElement | null) => { lineRefs.current[i] = el; }}
              >
                <span className={styles.lineFill} ref={(el: HTMLSpanElement | null) => { fillRefs.current[i] = el; }}></span>
              </div>
            ))}
          </div>
          <b className={styles.badge} aria-hidden="true"><span className={styles.badgeNum} ref={pctRef}>0%</span><span className={styles.badgeUnit}>채움</span></b>
        </div>
      </div>
    </main>
  );
}