04Favorite star that draws its line, then fills

<main class="stage">
  <section class="st is-demo" id="st" aria-label="A product card kept in favorites">
    <article class="st__card">
      <span class="st__thumb" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><path d="M224,56V178.06l-39.72-39.72a8,8,0,0,0-11.31,0L147.31,164,97.66,114.34a8,8,0,0,0-11.32,0L32,168.69V56a8,8,0,0,1,8-8H216A8,8,0,0,1,224,56Z" opacity=".2"/><path d="M216,40H40A16,16,0,0,0,24,56V200a16,16,0,0,0,16,16H216a16,16,0,0,0,16-16V56A16,16,0,0,0,216,40Zm0,16V158.75l-26.07-26.06a16,16,0,0,0-22.63,0l-20,20-44-44a16,16,0,0,0-22.62,0L40,149.37V56ZM40,172l52-52,80,80H40Zm176,28H194.63l-36-36,20-20L216,181.38V200ZM144,100a12,12,0,1,1,12,12A12,12,0,0,1,144,100Z"/></svg></span>
      <div class="st__body">
        <h2 class="st__title">Spring garden dress</h2>
        <p class="st__meta">Pale mint · one size</p>
      </div>
      <button class="st__btn" type="button" id="st-btn" aria-pressed="false" aria-label="Add to favorites">
        <span class="st__star" aria-hidden="true">
          <svg class="st__base" viewBox="0 0 256 256" width="1em" height="1em"><path d="M239.18,97.26A16.38,16.38,0,0,0,224.92,86l-59-4.76L143.14,26.15a16.36,16.36,0,0,0-30.27,0L90.11,81.23,31.08,86a16.46,16.46,0,0,0-9.37,28.86l45,38.83L53,211.75a16.38,16.38,0,0,0,24.5,17.82L128,198.49l50.53,31.08A16.4,16.4,0,0,0,203,211.75l-13.76-58.07,45-38.83A16.43,16.43,0,0,0,239.18,97.26Z"/></svg>
          <svg class="st__draw" viewBox="0 0 256 256" width="1em" height="1em"><path pathLength="100" d="M239.18,97.26A16.38,16.38,0,0,0,224.92,86l-59-4.76L143.14,26.15a16.36,16.36,0,0,0-30.27,0L90.11,81.23,31.08,86a16.46,16.46,0,0,0-9.37,28.86l45,38.83L53,211.75a16.38,16.38,0,0,0,24.5,17.82L128,198.49l50.53,31.08A16.4,16.4,0,0,0,203,211.75l-13.76-58.07,45-38.83A16.43,16.43,0,0,0,239.18,97.26Z"/></svg>
          <svg class="st__fill" viewBox="0 0 256 256" width="1em" height="1em" aria-hidden="true"><path pathLength="100" d="M239.18,97.26A16.38,16.38,0,0,0,224.92,86l-59-4.76L143.14,26.15a16.36,16.36,0,0,0-30.27,0L90.11,81.23,31.08,86a16.46,16.46,0,0,0-9.37,28.86l45,38.83L53,211.75a16.38,16.38,0,0,0,24.5,17.82L128,198.49l50.53,31.08A16.4,16.4,0,0,0,203,211.75l-13.76-58.07,45-38.83A16.43,16.43,0,0,0,239.18,97.26Z"/></svg>
        </span>
      </button>
      <p class="st__saved" id="st-saved" aria-live="polite">Added to favorites</p>
    </article>
  </section>
</main>

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

// 선을 그려 채우는 즐겨찾기 별 — 그리기는 stroke-dashoffset, 채움 전환은 컷
$duration: 460ms;
$easing: $ease-out;
$color: $stage-yellow;

@include stage($stage-paper);

.st { display: grid; font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif; }

.st__card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: $sp-3;
  box-sizing: border-box;
  width: min(292px, 92vw);
  padding: $sp-4;
  border: 1px solid rgba(23, 20, 26, .16);
  border-radius: $r-card;
  background: $stage-paper;
  transition: background 0ms 460ms;
}

.st__thumb {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: $r-control;
  background: rgba(47, 109, 246, .14);
  color: $subject-blue;
  font-size: 26px;
}

.st__body { min-width: 0; }
.st__title {
  margin: 0;
  color: $subject-ink;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.35;
}
.st__meta {
  margin: 0;
  color: rgba(23, 20, 26, .72);
  font-size: 11px;
  line-height: 1.35;
}

// ── 별 버튼: 두 별을 겹쳐 두고 그리기 → 채움 컷 순서로 바뀐다 ──
.st__btn {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin: 0;
  padding: 0;
  border: 1px solid rgba(23, 20, 26, .18);
  border-radius: 50%;
  background: $stage-paper;
  cursor: pointer;
}
.st__btn:focus-visible { outline: 2px solid $subject-blue; outline-offset: 2px; }

.st__star {
  position: relative;
  display: inline-block;
  width: 30px;
  height: 30px;
  font-size: 30px;
}
.st__base,
.st__draw,
.st__fill {
  position: absolute;
  inset: 0;
  display: block;
}
// 담기 전에도 별자리가 보여야 한다 — 옅은 윤곽을 늘 깔아 둔다
.st__base path {
  fill: none;
  stroke: rgba(23, 20, 26, .28);
  stroke-width: 10;
  stroke-linejoin: round;
}
// 그려지는 테두리 — pathLength="100" 덕에 100 에서 0 으로 그린다
.st__draw path {
  fill: none;
  stroke: $subject-ink;
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  transition: stroke-dashoffset $duration $easing;
}
// 채워진 별 — 반투명 섞임 없이 컷으로 바뀐다
.st__fill path {
  fill: $color;
  stroke: $subject-ink;
  stroke-width: 10;
}
.st__fill { opacity: 0; transition: opacity 0ms $duration; }

.st__saved {
  position: absolute;
  right: $sp-2;
  bottom: $sp-1;
  margin: 0;
  padding: 0 $sp-2;
  border-radius: $r-pill;
  background: $subject-ink;
  color: $subject-cream;
  font-size: 10px;
  font-weight: 700;
  line-height: 1.6;
  opacity: 0;
}

// 정적 경로 — .is-on 에서 그리기가 끝나고 채움·팝·카드 물들임이 남는다
.st.is-on .st__draw path { stroke-dashoffset: 0; }
.st.is-on .st__fill { opacity: 1; }
.st.is-on .st__star { animation-name: st-pop; animation-duration: $dur-quick; animation-timing-function: $ease-pop; animation-iteration-count: 1; }
.st.is-on .st__card { background: rgba(255, 210, 63, .22); }
.st.is-on .st__saved { opacity: 1; transition: opacity 0ms $duration; }
@keyframes st-pop {
  0% { transform: scale(1); }
  55% { transform: scale(1.22); }
  100% { transform: scale(1); }
}

// ── 격자 미리보기 전용 2초 루프: 그리기 → 채움 컷 → 팝 → 되돌림 ──
@keyframes st-loop-draw {
  0%, 10% { stroke-dashoffset: 100; }
  42%, 82% { stroke-dashoffset: 0; }
  94%, 100% { stroke-dashoffset: 100; }
}
@keyframes st-loop-fill {
  0%, 41% { opacity: 0; }
  42%, 81% { opacity: 1; }
  82%, 100% { opacity: 0; }
}
@keyframes st-loop-card {
  0%, 41% { background: $stage-paper; }
  42%, 81% { background: rgba(255, 210, 63, .22); }
  82%, 100% { background: $stage-paper; }
}
@keyframes st-loop-saved {
  0%, 44% { opacity: 0; }
  46%, 80% { opacity: 1; }
  82%, 100% { opacity: 0; }
}
@keyframes st-loop-pop {
  0%, 42% { transform: scale(1); }
  50% { transform: scale(1.22); }
  58%, 100% { transform: scale(1); }
}
.st.is-demo {
  .st__draw path {
    animation-name: st-loop-draw;
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .st__fill {
    animation-name: st-loop-fill;
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .st__card {
    animation-name: st-loop-card;
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .st__saved {
    animation-name: st-loop-saved;
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .st__star {
    animation-name: st-loop-pop;
    animation-duration: $dur-loop;
    animation-timing-function: $ease-pop;
    animation-iteration-count: infinite;
  }
}

@media (max-width: 340px) {
  .st__card { padding: $sp-3; gap: $sp-2; }
  .st__thumb { width: 36px; height: 36px; font-size: 22px; }
  .st__title { font-size: 12px; }
  .st__btn { width: 40px; height: 40px; }
  .st__star { width: 24px; height: 24px; font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .st.is-demo .st__draw path,
  .st.is-demo .st__fill,
  .st.is-demo .st__card,
  .st.is-demo .st__saved,
  .st.is-demo .st__star { animation: none !important; transform: none !important; }
  // 그린 결과만 남긴다 — 테두리는 완성, 채움은 켜짐
  .st.is-demo .st__draw path { stroke-dashoffset: 0 !important; }
  .st.is-demo .st__fill { opacity: 1 !important; }
  .st.is-demo .st__card { background: rgba(255, 210, 63, .22) !important; }
  .st.is-demo .st__saved { opacity: 1 !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);
}

.st {
  display: grid;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
}

.st__card {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  box-sizing: border-box;
  width: min(292px, 92vw);
  padding: 16px;
  border: 1px solid rgba(23, 20, 26, 0.16);
  border-radius: 16px;
  background: #ffffff;
  transition: background 0ms 460ms;
}

.st__thumb {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(47, 109, 246, 0.14);
  color: #2f6df6;
  font-size: 26px;
}

.st__body {
  min-width: 0;
}

.st__title {
  margin: 0;
  color: #17141a;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.35;
}

.st__meta {
  margin: 0;
  color: rgba(23, 20, 26, 0.72);
  font-size: 11px;
  line-height: 1.35;
}

.st__btn {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin: 0;
  padding: 0;
  border: 1px solid rgba(23, 20, 26, 0.18);
  border-radius: 50%;
  background: #ffffff;
  cursor: pointer;
}

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

.st__star {
  position: relative;
  display: inline-block;
  width: 30px;
  height: 30px;
  font-size: 30px;
}

.st__base,
.st__draw,
.st__fill {
  position: absolute;
  inset: 0;
  display: block;
}

.st__base path {
  fill: none;
  stroke: rgba(23, 20, 26, 0.28);
  stroke-width: 10;
  stroke-linejoin: round;
}

.st__draw path {
  fill: none;
  stroke: #17141a;
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  transition: stroke-dashoffset 460ms ease-out;
}

.st__fill path {
  fill: #ffd23f;
  stroke: #17141a;
  stroke-width: 10;
}

.st__fill {
  opacity: 0;
  transition: opacity 0ms 460ms;
}

.st__saved {
  position: absolute;
  right: 8px;
  bottom: 4px;
  margin: 0;
  padding: 0 8px;
  border-radius: 999px;
  background: #17141a;
  color: #fff7e6;
  font-size: 10px;
  font-weight: 700;
  line-height: 1.6;
  opacity: 0;
}

.st.is-on .st__draw path {
  stroke-dashoffset: 0;
}

.st.is-on .st__fill {
  opacity: 1;
}

.st.is-on .st__star {
  animation-name: st-pop;
  animation-duration: 220ms;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: 1;
}

.st.is-on .st__card {
  background: rgba(255, 210, 63, 0.22);
}

.st.is-on .st__saved {
  opacity: 1;
  transition: opacity 0ms 460ms;
}

@keyframes st-pop {
  0% {
    transform: scale(1);
  }
  55% {
    transform: scale(1.22);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes st-loop-draw {
  0%, 10% {
    stroke-dashoffset: 100;
  }
  42%, 82% {
    stroke-dashoffset: 0;
  }
  94%, 100% {
    stroke-dashoffset: 100;
  }
}
@keyframes st-loop-fill {
  0%, 41% {
    opacity: 0;
  }
  42%, 81% {
    opacity: 1;
  }
  82%, 100% {
    opacity: 0;
  }
}
@keyframes st-loop-card {
  0%, 41% {
    background: #ffffff;
  }
  42%, 81% {
    background: rgba(255, 210, 63, 0.22);
  }
  82%, 100% {
    background: #ffffff;
  }
}
@keyframes st-loop-saved {
  0%, 44% {
    opacity: 0;
  }
  46%, 80% {
    opacity: 1;
  }
  82%, 100% {
    opacity: 0;
  }
}
@keyframes st-loop-pop {
  0%, 42% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.22);
  }
  58%, 100% {
    transform: scale(1);
  }
}
.st.is-demo .st__draw path {
  animation-name: st-loop-draw;
  animation-duration: 2s;
  animation-timing-function: ease-out;
  animation-iteration-count: infinite;
}
.st.is-demo .st__fill {
  animation-name: st-loop-fill;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.st.is-demo .st__card {
  animation-name: st-loop-card;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.st.is-demo .st__saved {
  animation-name: st-loop-saved;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.st.is-demo .st__star {
  animation-name: st-loop-pop;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}

@media (max-width: 340px) {
  .st__card {
    padding: 12px;
    gap: 8px;
  }
  .st__thumb {
    width: 36px;
    height: 36px;
    font-size: 22px;
  }
  .st__title {
    font-size: 12px;
  }
  .st__btn {
    width: 40px;
    height: 40px;
  }
  .st__star {
    width: 24px;
    height: 24px;
    font-size: 24px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .st.is-demo .st__draw path,
  .st.is-demo .st__fill,
  .st.is-demo .st__card,
  .st.is-demo .st__saved,
  .st.is-demo .st__star {
    animation: none !important;
    transform: none !important;
  }
  .st.is-demo .st__draw path {
    stroke-dashoffset: 0 !important;
  }
  .st.is-demo .st__fill {
    opacity: 1 !important;
  }
  .st.is-demo .st__card {
    background: rgba(255, 210, 63, 0.22) !important;
  }
  .st.is-demo .st__saved {
    opacity: 1 !important;
  }
}

// 즐겨찾기 별: 누르면 테두리가 그려지고(step 1) 다 그린 뒤 채움으로 바뀐다(step 2)
var st = document.getElementById('st');
var stBtn = document.getElementById('st-btn');
var stSaved = document.getElementById('st-saved');
var stOn = false;
stBtn.addEventListener('click', function () {
  st.classList.remove('is-demo');
  stOn = !stOn;
  st.classList.toggle('is-on', stOn);
  stBtn.setAttribute('aria-pressed', stOn ? 'true' : 'false');
  stBtn.setAttribute('aria-label', stOn ? 'Remove from favorites' : 'Add to favorites');
  stSaved.textContent = stOn ? 'Added to favorites' : 'Removed from favorites';
});

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

export type StarDrawButtonProps = {
  title?: string;
  meta?: string;
  /** 꺼진 상태의 버튼 이름 (누르면 담긴다) */
  addLabel?: string;
  /** 켜진 상태의 버튼 이름 (누르면 빠진다) */
  removeLabel?: string;
  savedText?: string;
  removedText?: string;
  groupLabel?: string;
  /** 격자 미리보기용 2초 자동 루프. 사람이 손대면 꺼진다 */
  demo?: boolean;
  /** 테두리를 그리는 시간(ms). 채움 컷은 이 시간이 끝난 뒤에 온다 */
  duration?: number;
  easing?: string;
  /** 다 그린 별의 채움색 */
  color?: string;
};

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

// vanilla 판 index.html 에 인라인된 Phosphor Duotone 별 — 테두리용·채움용 두 장이 같은 경로를 쓴다
const STAR =
  "M239.18,97.26A16.38,16.38,0,0,0,224.92,86l-59-4.76L143.14,26.15a16.36,16.36,0,0,0-30.27,0L90.11,81.23,31.08,86a16.46,16.46,0,0,0-9.37,28.86l45,38.83L53,211.75a16.38,16.38,0,0,0,24.5,17.82L128,198.49l50.53,31.08A16.4,16.4,0,0,0,203,211.75l-13.76-58.07,45-38.83A16.43,16.43,0,0,0,239.18,97.26Z";

function Thumb() {
  return (
    <svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor">
      <path
        d="M224,56V178.06l-39.72-39.72a8,8,0,0,0-11.31,0L147.31,164,97.66,114.34a8,8,0,0,0-11.32,0L32,168.69V56a8,8,0,0,1,8-8H216A8,8,0,0,1,224,56Z"
        opacity=".2"
      />
      <path d="M216,40H40A16,16,0,0,0,24,56V200a16,16,0,0,0,16,16H216a16,16,0,0,0,16-16V56A16,16,0,0,0,216,40Zm0,16V158.75l-26.07-26.06a16,16,0,0,0-22.63,0l-20,20-44-44a16,16,0,0,0-22.62,0L40,149.37V56ZM40,172l52-52,80,80H40Zm176,28H194.63l-36-36,20-20L216,181.38V200ZM144,100a12,12,0,1,1,12,12A12,12,0,0,1,144,100Z" />
    </svg>
  );
}

export default function StarDrawButton({
  title = "Spring garden dress",
  meta = "Soft mint · one size",
  addLabel = "Add to favorites",
  removeLabel = "Remove from favorites",
  savedText = "Saved to favorites",
  removedText = "Removed from favorites",
  groupLabel = "Product card you can save to favorites",
  demo = true,
  duration = 460,
  easing = "ease-out",
  color = "#ffd23f",
}: StarDrawButtonProps) {
  const [on, setOn] = useState(false);
  const [live, setLive] = useState(demo);

  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  // 누르면 미리보기 루프를 끄고 사람이 만든 상태만 남긴다
  function toggle() {
    setLive(false);
    setOn((v) => !v);
  }

  const cls = [styles.st, live ? styles.isDemo : "", on ? styles.isOn : ""].filter(Boolean).join(" ");

  return (
    <section className={cls} style={vars} aria-label={groupLabel}>
      <article className={styles.card}>
        <span className={styles.thumb} aria-hidden="true">
          <Thumb />
        </span>
        <div className={styles.body}>
          <h2 className={styles.title}>{title}</h2>
          <p className={styles.meta}>{meta}</p>
        </div>
        <button
          className={styles.btn}
          type="button"
          aria-pressed={on}
          aria-label={on ? removeLabel : addLabel}
          onClick={toggle}
        >
          <span className={styles.star} aria-hidden="true">
            {/* 바탕 — 담기 전에도 별자리가 보이게 옅은 윤곽을 늘 깔아 둔다 */}
            <svg className={styles.base} viewBox="0 0 256 256" width="1em" height="1em">
              <path d={STAR} />
            </svg>
            {/* 테두리 — pathLength 100 이라 100 → 0 으로 한 바퀴 그려진다 */}
            <svg className={styles.draw} viewBox="0 0 256 256" width="1em" height="1em">
              <path pathLength={100} d={STAR} />
            </svg>
            {/* 채움 — 반투명으로 섞지 않고 그리기가 끝난 뒤 컷으로 나타난다 */}
            <svg className={styles.fill} viewBox="0 0 256 256" width="1em" height="1em" aria-hidden="true">
              <path pathLength={100} d={STAR} />
            </svg>
          </span>
        </button>
        <p className={styles.saved} aria-live="polite">
          {on ? savedText : removedText}
        </p>
      </article>
    </section>
  );
}