05Discount pricing

<main class="stage">
  <section class="dp">
    <span class="dp__badge">Launch discount</span>
    <div class="dp__switch-row">
      <span class="dp__switch-label">Billed yearly</span>
      <button type="button" class="dp__switch" role="switch" aria-checked="false"><span class="dp__knob"></span></button>
    </div>
    <div class="dp__price-wrap">
      <div class="dp__price dp__price--monthly is-active">
        <span class="dp__old">₩19,000</span>
        <span class="dp__now">₩12,900<small>/mo</small></span>
      </div>
      <div class="dp__price dp__price--yearly">
        <span class="dp__old">₩228,000</span>
        <span class="dp__now">₩9,900<small>/mo</small></span>
      </div>
    </div>
  </section>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-base;                                 // 가격판 크로스페이드
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-ink);

.dp { position: relative; width: min(300px, 94vw); text-align: center; padding-top: $sp-5; }

.dp__badge {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background: rgba(255, 210, 63, .2);
  color: $stage-yellow;
  font-weight: 700; font-size: 10px; line-height: 1; font-family: inherit;
  letter-spacing: .04em;
  animation: dp-badge 2.2s ease-in-out infinite;
}
@keyframes dp-badge {
  0%, 100% { transform: translateX(-50%) scale(1); }
  50%      { transform: translateX(-50%) scale(1.08); }
}

.dp__switch-row { display: flex; align-items: center; justify-content: center; gap: $sp-2; margin: $sp-4 0; }
.dp__switch-label { font-weight: 600; font-size: 12px; line-height: 1; font-family: inherit; color: rgba(255, 247, 230, .7); }
.dp__switch {
  position: relative;
  width: 40px; height: 22px;
  border: 0;
  border-radius: $r-pill;
  background: rgba(255, 247, 230, .18);
  cursor: pointer;
  transition: background $duration $easing;
}
.dp__switch[aria-checked="true"] { background: $subject-blue; }
.dp__knob {
  position: absolute;
  top: 3px; left: 3px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: $subject-cream;
  transition: transform $duration $easing;
}
.dp__switch[aria-checked="true"] .dp__knob { transform: translateX(18px); }

.dp__price-wrap { position: relative; height: 64px; }
.dp__price {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-1;
  opacity: 0;
  transition: opacity $duration $easing;
}
.dp__price.is-active { opacity: 1; }
.dp__old { font-weight: 600; font-size: 12px; line-height: 1; font-family: inherit; color: rgba(255, 247, 230, .4); text-decoration: line-through; }
.dp__now { font-weight: 800; font-size: clamp(22px, 7vw, 28px); line-height: 1; font-family: inherit; color: $subject-cream; }
.dp__now small { font-weight: 600; font-size: 11px; line-height: 1; font-family: inherit; color: rgba(255, 247, 230, .55); }

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .dp__badge { animation: none !important; }
  .dp__switch, .dp__knob, .dp__price { transition: none !important; }
}

// ── 반응형(320×200) ──────────────────────────────────
@media (max-width: 340px), (max-height: 220px) {
  .dp { padding-top: $sp-4; }
  .dp__switch-row { margin: $sp-3 0; }
}

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);
}

.dp {
  position: relative;
  width: min(300px, 94vw);
  text-align: center;
  padding-top: 20px;
}

.dp__badge {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(255, 210, 63, 0.2);
  color: #ffd23f;
  font-weight: 700;
  font-size: 10px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.04em;
  animation: dp-badge 2.2s ease-in-out infinite;
}

@keyframes dp-badge {
  0%, 100% {
    transform: translateX(-50%) scale(1);
  }
  50% {
    transform: translateX(-50%) scale(1.08);
  }
}
.dp__switch-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 16px 0;
}

.dp__switch-label {
  font-weight: 600;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  color: rgba(255, 247, 230, 0.7);
}

.dp__switch {
  position: relative;
  width: 40px;
  height: 22px;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 247, 230, 0.18);
  cursor: pointer;
  transition: background 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.dp__switch[aria-checked=true] {
  background: #2f6df6;
}

.dp__knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff7e6;
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.dp__switch[aria-checked=true] .dp__knob {
  transform: translateX(18px);
}

.dp__price-wrap {
  position: relative;
  height: 64px;
}

.dp__price {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  opacity: 0;
  transition: opacity 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.dp__price.is-active {
  opacity: 1;
}

.dp__old {
  font-weight: 600;
  font-size: 12px;
  line-height: 1;
  font-family: inherit;
  color: rgba(255, 247, 230, 0.4);
  text-decoration: line-through;
}

.dp__now {
  font-weight: 800;
  font-size: clamp(22px, 7vw, 28px);
  line-height: 1;
  font-family: inherit;
  color: #fff7e6;
}

.dp__now small {
  font-weight: 600;
  font-size: 11px;
  line-height: 1;
  font-family: inherit;
  color: rgba(255, 247, 230, 0.55);
}

@media (prefers-reduced-motion: reduce) {
  .dp__badge {
    animation: none !important;
  }
  .dp__switch, .dp__knob, .dp__price {
    transition: none !important;
  }
}
@media (max-width: 340px), (max-height: 220px) {
  .dp {
    padding-top: 16px;
  }
  .dp__switch-row {
    margin: 12px 0;
  }
}

// 실제 동작: 스위치를 누르면 aria-checked 가 실제로 바뀌고 월간/연간 가격판이 opacity 로 크로스페이드된다.
var sw = document.querySelector('.dp__switch');
var monthly = document.querySelector('.dp__price--monthly');
var yearly = document.querySelector('.dp__price--yearly');
sw.addEventListener('click', function () {
  var on = sw.getAttribute('aria-checked') === 'true';
  sw.setAttribute('aria-checked', String(!on));
  monthly.classList.toggle('is-active', on);
  yearly.classList.toggle('is-active', !on);
});

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

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

export default function DiscountPricing({ duration = 300, easing = "cubic-bezier(.2,.8,.2,1)", color = "#2f6df6" }: DiscountPricingProps) {
  const [yearly, setYearly] = useState(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  return (
    <section className={styles.dp} style={vars}>
      <span className={styles.badge}>런칭 할인</span>
      <div className={styles.switchRow}>
        <span className={styles.switchLabel}>연간 결제</span>
        <button type="button" className={styles.switch} role="switch" aria-checked={yearly} onClick={() => setYearly((v) => !v)}>
          <span className={styles.knob} />
        </button>
      </div>
      <div className={styles.priceWrap}>
        <div className={`${styles.price} ${!yearly ? styles.active : ""}`}>
          <span className={styles.old}>₩19,000</span>
          <span className={styles.now}>₩12,900<small>/월</small></span>
        </div>
        <div className={`${styles.price} ${yearly ? styles.active : ""}`}>
          <span className={styles.old}>₩228,000</span>
          <span className={styles.now}>₩9,900<small>/월</small></span>
        </div>
      </div>
    </section>
  );
}