06Todo strikethrough

<main class="stage">
  <label class="todo is-demo">
    <input type="checkbox" class="sr-input">
    <span class="todo__box" aria-hidden="true">
      <svg viewBox="0 0 24 24" class="todo__svg"><path d="M5 12.5 L10 17.5 L19 7" /></svg>
    </span>
    <span class="todo__text">
      <span class="todo__label">Submit report</span>
      <span class="todo__strike" aria-hidden="true"></span>
    </span>
  </label>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-base;
$easing: $ease-out;
$color: $stage-ink;

// ── 데모 무대 ───────────────────────────────
@include stage($stage-yellow);

.sr-input {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.todo { display: inline-flex; align-items: center; gap: 12px; cursor: pointer;
        font-weight: 600; font-size: clamp(14px, 4vw, 16px); line-height: 1.3; font-family: inherit; color: $color; }
.todo__box {
  flex: none; width: 24px; height: 24px; border-radius: 6px; border: 2px solid rgba($color, .5);
  display: grid; place-items: center; transition: background $duration $easing, border-color $duration $easing;
}
.sr-input:checked ~ .todo__box { background: $color; border-color: $color; }
.sr-input:focus-visible ~ .todo__box { box-shadow: 0 0 0 3px rgba($color, .3); }
.todo__svg {
  width: 15px; height: 15px; fill: none; stroke: $stage-yellow; stroke-width: 2.6;
  stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 20; stroke-dashoffset: 20;
  transition: stroke-dashoffset $duration $easing;
}
.sr-input:checked ~ .todo__box .todo__svg { stroke-dashoffset: 0; }
.todo__text { position: relative; display: inline-block; }
.todo__label { transition: opacity $duration $easing; }
.sr-input:checked ~ .todo__text .todo__label { opacity: .45; }
.todo__strike {
  position: absolute; inset-inline: 0; top: 50%; height: 2px; background: currentColor;
  transform: scaleX(0); transform-origin: left; transition: transform $duration $easing; // 규칙8: 취소선 왼쪽 그어짐
}
.sr-input:checked ~ .todo__text .todo__strike { transform: scaleX(1); }

@media (prefers-reduced-motion: reduce) {
  // 접근성: 움직임 줄이기 설정이면 트랜지션을 즉시 끝낸다
  .todo__box, .todo__svg, .todo__label, .todo__strike { transition-duration: 1ms !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);
}

.sr-input {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.todo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  font-weight: 600;
  font-size: clamp(14px, 4vw, 16px);
  line-height: 1.3;
  font-family: inherit;
  color: #17141a;
}

.todo__box {
  flex: none;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  border: 2px solid rgba(23, 20, 26, 0.5);
  display: grid;
  place-items: center;
  transition: background 300ms ease-out, border-color 300ms ease-out;
}

.sr-input:checked ~ .todo__box {
  background: #17141a;
  border-color: #17141a;
}

.sr-input:focus-visible ~ .todo__box {
  box-shadow: 0 0 0 3px rgba(23, 20, 26, 0.3);
}

.todo__svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: #ffd23f;
  stroke-width: 2.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 20;
  stroke-dashoffset: 20;
  transition: stroke-dashoffset 300ms ease-out;
}

.sr-input:checked ~ .todo__box .todo__svg {
  stroke-dashoffset: 0;
}

.todo__text {
  position: relative;
  display: inline-block;
}

.todo__label {
  transition: opacity 300ms ease-out;
}

.sr-input:checked ~ .todo__text .todo__label {
  opacity: 0.45;
}

.todo__strike {
  position: absolute;
  inset-inline: 0;
  top: 50%;
  height: 2px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 300ms ease-out;
}

.sr-input:checked ~ .todo__text .todo__strike {
  transform: scaleX(1);
}

@media (prefers-reduced-motion: reduce) {
  .todo__box, .todo__svg, .todo__label, .todo__strike {
    transition-duration: 1ms !important;
  }
}

// .is-demo 데모용 자동 토글. 실제로는 클릭이 :checked 를 바꾼다 (4줄)
document.querySelectorAll('.is-demo .sr-input').forEach(function (el) {
  var t = function () { el.checked = !el.checked; };
  t(); setInterval(t, 600);
});

import { useState } from "react";
import type { CSSProperties, ChangeEvent } from "react";
import styles from "./TodoStrike.module.scss";

export type TodoStrikeProps = {
  label?: string;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function TodoStrike({
  label = "Submit report",
  duration = 300,
  easing = "ease-out",
  color = "#17141a",
}: TodoStrikeProps) {
  const [done, setDone] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <label className={styles.todo} style={vars}>
      <input
        type="checkbox"
        className={styles.srInput}
        checked={done}
        onChange={(e: ChangeEvent<HTMLInputElement>) => setDone(e.target.checked)}
      />
      <span className={styles.box} aria-hidden="true">
        {done && <span className={styles.check}>✓</span>}
      </span>
      <span className={styles.text}>
        <span className={styles.label} data-done={done}>{label}</span>
        <span className={styles.strike} data-done={done} aria-hidden="true" />
      </span>
    </label>
  );
}