08Star-rate input

<main class="stage">
  <fieldset class="stars is-demo">
    <legend class="sr-only">Choose a rating</legend>
    <input type="radio" id="s5" name="rate" class="sr-input" value="5">
    <label for="s5" class="star" aria-label="5 stars"><span class="star__icon" aria-hidden="true"></span></label>
    <input type="radio" id="s4" name="rate" class="sr-input" value="4">
    <label for="s4" class="star" aria-label="4 stars"><span class="star__icon" aria-hidden="true"></span></label>
    <input type="radio" id="s3" name="rate" class="sr-input" value="3" checked>
    <label for="s3" class="star" aria-label="3 stars"><span class="star__icon" aria-hidden="true"></span></label>
    <input type="radio" id="s2" name="rate" class="sr-input" value="2">
    <label for="s2" class="star" aria-label="2 stars"><span class="star__icon" aria-hidden="true"></span></label>
    <input type="radio" id="s1" name="rate" class="sr-input" value="1">
    <label for="s1" class="star" aria-label="1 star"><span class="star__icon" aria-hidden="true"></span></label>
  </fieldset>
</main>

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

// ── 변수 3개 ──────────────────────────────
$duration: $dur-quick;
$easing: $ease-out;
$color: $subject-blue;

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

.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;
}

// 별점 트릭: 라디오를 5→1 역순으로 두고 row-reverse 로 뒤집어 화면엔 1→5 로 보이게 한다.
.stars { display: flex; flex-direction: row-reverse; gap: 6px; border: 0; margin: 0; padding: 0; }
.star { cursor: pointer; display: block; }
.star__icon {
  display: block; width: 26px; height: 26px; background: rgba($subject-ink, .22);
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
  transition: background $duration $easing;
}
.sr-input:checked ~ .star .star__icon,
.sr-input:checked ~ .star ~ .star .star__icon { background: $color; }
.sr-input:focus-visible + .star .star__icon { box-shadow: 0 0 0 3px rgba($subject-blue, .35); }

@media (prefers-reduced-motion: reduce) {
  // 접근성: 움직임 줄이기 설정이면 트랜지션을 즉시 끝낸다
  .star__icon { 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: #ffffff;
  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;
}

.stars {
  display: flex;
  flex-direction: row-reverse;
  gap: 6px;
  border: 0;
  margin: 0;
  padding: 0;
}

.star {
  cursor: pointer;
  display: block;
}

.star__icon {
  display: block;
  width: 26px;
  height: 26px;
  background: rgba(23, 20, 26, 0.22);
  clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
  transition: background 220ms ease-out;
}

.sr-input:checked ~ .star .star__icon,
.sr-input:checked ~ .star ~ .star .star__icon {
  background: #2f6df6;
}

.sr-input:focus-visible + .star .star__icon {
  box-shadow: 0 0 0 3px rgba(47, 109, 246, 0.35);
}

@media (prefers-reduced-motion: reduce) {
  .star__icon {
    transition-duration: 1ms !important;
  }
}

// .is-demo 데모용 자동 순환. 실제로는 클릭이 :checked 를 바꾼다 (6줄)
document.querySelectorAll('.is-demo').forEach(function (grp) {
  var inputs = grp.querySelectorAll('.sr-input'); var i = 0;
  var t = function () { inputs[i % inputs.length].checked = true; i++; };
  t(); setInterval(t, 500);
});

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

export type StarRateInputProps = {
  legend?: string;
  max?: number;
  duration?: number;
  easing?: string;
  color?: string;
};

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

export default function StarRateInput({
  legend = "Choose a rating",
  max = 5,
  duration = 220,
  easing = "ease-out",
  color = "#2f6df6",
}: StarRateInputProps) {
  const [rating, setRating] = useState(3);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  const stars = Array.from({ length: max }, (_, i) => i + 1);

  return (
    <fieldset className={styles.stars} style={vars}>
      <legend className={styles.srOnly}>{legend}</legend>
      {stars.map((n) => (
        <label className={styles.star} key={n}>
          <input
            type="radio"
            name="rate"
            className={styles.srInput}
            checked={rating === n}
            onChange={() => setRating(n)}
            aria-label={`${n} star${n > 1 ? "s" : ""}`}
          />
          <span className={styles.icon} data-filled={n <= rating} aria-hidden="true" />
        </label>
      ))}
    </fieldset>
  );
}