04Quote box filling left to right

<main class="stage">
  <figure class="qt is-demo" aria-label="Quote box filling left to right">
    <figcaption class="qt__label">Key point</figcaption>
    <blockquote class="qt__body">Before changing a value,<br>read what is already on screen.</blockquote>
  </figure>
</main>

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

// 요점 박스형 인용구 — ::before 로 깔린 옅은 배경이 scaleX(transform-origin: left) 로 좌에서 우로 차오르고,
// 채워진 만큼 문장이 뒤따라 드러난다. 실사용에서는 상자에 손을 올리면 라벨 색이 한 박자 늦게 깊어진다
// (transition-delay — 채워지는 리듬을 호버에서도 유지하는 소질).
// 복귀: 배경은 우에서 좌로 scaleX 로 흘러 나가고(컷 아님 — 한 프레임 면적이 입장보다 작게),
// 라벨·문장은 서로 다른 지점에 컷. 입장(배경 채움+문장 등장이 겹치는 구간)이 최대 변화 프레임.
$duration: $dur-loop;
$easing: $ease-out;
$color: $subject-lilac;

@include stage($stage-paper);

.qt {
  box-sizing: border-box;
  position: relative;
  width: min(320px, 92vw);
  margin: 0;
  padding: $sp-4 $sp-5;
  border: 1px solid rgba(185, 160, 255, .55);
  border-radius: $r-card;
  overflow: hidden;
  font-family: inherit;
  isolation: isolate;
}
.qt * { box-sizing: border-box; }

// 차오르는 배경 — 내용보다 아래 층에 깔고 z-index 로 순서를 못박는다
.qt::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: $color;
  opacity: .3;
}
.qt__label,
.qt__body {
  position: relative;
  z-index: 1;
  margin: 0;
  display: block;
}
.qt__label {
  font-size: 11px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: .08em;
  color: rgba(85, 55, 180, .9);
  transition-property: color;
  transition-duration: 140ms;
  transition-delay: 80ms;
}
.qt__body {
  margin-top: $sp-2;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6;
  color: $subject-ink;
}
// 실사용 호버 — 라벨이 채워지는 리듬처럼 한 박자 늦게 깊어진다
.qt:hover .qt__label { color: rgba(60, 30, 150, 1); }

// ── 미리보기 루프 ─────────────────
.qt.is-demo::before {
  transform-origin: left center; // 규칙8: 채움 방향 — 옅은 배경이 왼쪽 변에서 scaleX 로 차오른다
  animation-name: qtFill;
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}
.qt.is-demo .qt__label {
  animation-name: qtLabel;
  animation-duration: $duration;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.qt.is-demo .qt__body {
  animation-name: qtBody;
  animation-duration: $duration;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
}

// 배경: 0~18% 좌→우 채움(입장이 프레임당 더 넓게), 74~96% 우에서 좌로 흘러 나가감(컷 아님)
@keyframes qtFill {
  0%        { transform: scaleX(0); }
  18%, 74%  { transform: scaleX(1); }
  96%, 100% { transform: scaleX(0); }
}
// 라벨: 채움이 절반 지날 때 컷 — 채우는 프레임과 겹쳐 입장이 최대 변화가 되게
@keyframes qtLabel {
  0%, 7%    { opacity: 0; }
  8%, 68%   { opacity: 1; }
  72%, 100% { opacity: 0; }
}
// 문장: 채움을 따라 슬라이드하며 드러남
@keyframes qtBody {
  0%, 10%   { opacity: 0; transform: translateX(-10px); }
  26%, 70%  { opacity: 1; transform: translateX(0); }
  76%, 100% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .qt.is-demo::before,
  .qt.is-demo .qt__label,
  .qt.is-demo .qt__body {
    animation: none !important;
  }
}

@media (max-width: 340px) {
  .qt { padding: $sp-3 $sp-4; }
  .qt__body { font-size: 13px; }
}

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);
}

.qt {
  box-sizing: border-box;
  position: relative;
  width: min(320px, 92vw);
  margin: 0;
  padding: 16px 20px;
  border: 1px solid rgba(185, 160, 255, 0.55);
  border-radius: 16px;
  overflow: hidden;
  font-family: inherit;
  isolation: isolate;
}

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

.qt::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: #b9a0ff;
  opacity: 0.3;
}

.qt__label,
.qt__body {
  position: relative;
  z-index: 1;
  margin: 0;
  display: block;
}

.qt__label {
  font-size: 11px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.08em;
  color: rgba(85, 55, 180, 0.9);
  transition-property: color;
  transition-duration: 140ms;
  transition-delay: 80ms;
}

.qt__body {
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6;
  color: #17141a;
}

.qt:hover .qt__label {
  color: rgb(60, 30, 150);
}

.qt.is-demo::before {
  transform-origin: left center;
  animation-name: qtFill;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

.qt.is-demo .qt__label {
  animation-name: qtLabel;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

.qt.is-demo .qt__body {
  animation-name: qtBody;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}

@keyframes qtFill {
  0% {
    transform: scaleX(0);
  }
  18%, 74% {
    transform: scaleX(1);
  }
  96%, 100% {
    transform: scaleX(0);
  }
}
@keyframes qtLabel {
  0%, 7% {
    opacity: 0;
  }
  8%, 68% {
    opacity: 1;
  }
  72%, 100% {
    opacity: 0;
  }
}
@keyframes qtBody {
  0%, 10% {
    opacity: 0;
    transform: translateX(-10px);
  }
  26%, 70% {
    opacity: 1;
    transform: translateX(0);
  }
  76%, 100% {
    opacity: 0;
  }
}
@media (prefers-reduced-motion: reduce) {
  .qt.is-demo::before,
  .qt.is-demo .qt__label,
  .qt.is-demo .qt__body {
    animation: none !important;
  }
}
@media (max-width: 340px) {
  .qt {
    padding: 12px 16px;
  }
  .qt__body {
    font-size: 13px;
  }
}

// QuoteTintFill — vanilla 판(run/282/demo/04-quote-tint-fill) 의 React 포트.
import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./QuoteTintFill.module.scss";

export type QuoteTintFillProps = {
  label?: string;
  line1?: string;
  line2?: string;
  groupLabel?: string;
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function QuoteTintFill({
  label = "작업 요점",
  line1 = "값을 바꾸기 전에",
  line2 = "먼저 화면에 있는 값을 읽어라.",
  groupLabel = "배경이 차오르는 인용 박스",
  demo = true,
  duration = 2000,
  easing = "ease-out",
  color = "#b9a0ff",
}: QuoteTintFillProps) {
  const [live, setLive] = useState(demo);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function onEnter() {
    setLive(false);
  }

  const cls = [styles.qt, live ? styles.isDemo : ""].filter(Boolean).join(" ");
  return (
    <figure className={cls} style={vars} aria-label={groupLabel} onMouseEnter={onEnter}>
      <figcaption className={styles.label}>{label}</figcaption>
      <blockquote className={styles.body}>{line1}<br />{line2}</blockquote>
    </figure>
  );
}