03Pricing cards — a list where only the recommended card gets a larger scale value

<main class="stage" id="stage">
  <div class="pricing is-demo" id="pricing">
    <div class="toggle" role="group" aria-label="Billing cycle">
      <button class="toggle__btn toggle__btn--m is-active" id="btn-monthly" type="button" aria-pressed="true">Monthly</button>
      <button class="toggle__btn toggle__btn--y" id="btn-yearly" type="button" aria-pressed="false">Yearly -20%</button>
    </div>
    <div class="plans">
      <article class="plan">
        <p class="plan__name">Starter</p>
        <div class="plan__price">
          <span class="plan__amount plan__amount--m">9,000</span>
          <span class="plan__amount plan__amount--y">7,200</span>
        </div>
        <div class="plan__unit-row">
          <span class="plan__unit plan__unit--m">/mo</span>
          <span class="plan__unit plan__unit--y">/mo (billed yearly)</span>
        </div>
      </article>
      <article class="plan plan--featured">
        <p class="plan__badge">Recommended</p>
        <p class="plan__name">Pro</p>
        <div class="plan__price">
          <span class="plan__amount plan__amount--m">19,000</span>
          <span class="plan__amount plan__amount--y">15,200</span>
        </div>
        <div class="plan__unit-row">
          <span class="plan__unit plan__unit--m">/mo</span>
          <span class="plan__unit plan__unit--y">/mo (billed yearly)</span>
        </div>
      </article>
      <article class="plan">
        <p class="plan__name">Business</p>
        <div class="plan__price">
          <span class="plan__amount plan__amount--m">39,000</span>
          <span class="plan__amount plan__amount--y">31,200</span>
        </div>
        <div class="plan__unit-row">
          <span class="plan__unit plan__unit--m">/mo</span>
          <span class="plan__unit plan__unit--y">/mo (billed yearly)</span>
        </div>
      </article>
    </div>
  </div>
</main>

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

// 계산 상수: 추천 카드와 주변 카드의 scale 값 차이
$featured-scale: 1.08;

$duration: $dur-loop;
$easing: steps(1, end);
$color: $subject-cream;

@include stage($stage-orange);

.pricing {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-4;
  width: 100%;
}

.toggle {
  display: inline-flex;
  gap: $sp-1;
  padding: $sp-1;
  border-radius: $r-pill;
  background: rgba($subject-ink, .18);
}

.toggle__btn {
  border: 0;
  border-radius: $r-pill;
  padding: $sp-1 $sp-4;
  font-family: inherit;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.8;
  cursor: pointer;
  transition: background $dur-base $ease-out, color $dur-base $ease-out;
}

.toggle__btn.is-active {
  background: $color;
  color: $subject-orange-deep;
}

.toggle__btn:not(.is-active) {
  background: transparent;
  color: $color;
}

.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: $sp-3;
  width: 100%;
  max-width: 420px;
}

.plan {
  position: relative;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-1;
  padding: $sp-3 $sp-2;
  border-radius: $r-card;
  background: $stage-paper;
  box-shadow: $shadow-press;
}

.plan--featured {
  z-index: 1;
  background: $subject-ink;
  transform: scale(#{$featured-scale});
}

.is-demo .plan--featured {
  animation: featured-scale-in $dur-enter $ease-spring both;
}

@keyframes featured-scale-in {
  0% { transform: scale(1); }
  100% { transform: scale(#{$featured-scale}); }
}

.plan__badge {
  margin: 0;
  padding: $sp-1 $sp-2;
  border-radius: $r-xs;
  background: $color;
  color: $subject-orange-deep;
  font-weight: 700;
  font-size: 9px;
  line-height: 1.4;
}

.plan__name {
  margin: 0;
  color: $subject-ink;
  font-weight: 600;
  font-size: 12px;
  line-height: 1.4;
}

.plan--featured .plan__name { color: $stage-paper; }

.plan__price {
  position: relative;
  margin: 0;
  min-height: 20px;
  width: 100%;
  text-align: center;
}

.plan__amount {
  position: absolute;
  inset: 0;
  color: $subject-ink;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.4;
  white-space: nowrap;
  opacity: 0;
  transition: opacity $dur-base $ease-out;
}

.plan--featured .plan__amount { color: $stage-paper; }

.plan__amount--m { opacity: 1; }

.plan__unit-row {
  position: relative;
  width: 100%;
  height: 13px;
  text-align: center;
}

.plan__unit {
  position: absolute;
  inset: 0;
  color: rgba($subject-ink, .72);
  font-weight: 400;
  font-size: 9px;
  line-height: 1.4;
  white-space: nowrap;
  opacity: 0;
  transition: opacity $dur-base $ease-out;
}

.plan--featured .plan__unit { color: rgba($stage-paper, .78); }

.plan__unit--m { opacity: 1; }

.pricing.is-yearly .plan__amount--m,
.pricing.is-yearly .plan__unit--m { opacity: 0; }

.pricing.is-yearly .plan__amount--y,
.pricing.is-yearly .plan__unit--y { opacity: 1; }

.is-demo .plans > .plan:nth-child(1) .plan__amount--m,
.is-demo .plans > .plan:nth-child(1) .plan__unit--m {
  animation: fade-m-1 $duration $easing infinite;
}

.is-demo .plans > .plan:nth-child(1) .plan__amount--y,
.is-demo .plans > .plan:nth-child(1) .plan__unit--y {
  animation: fade-y-1 $duration $easing infinite;
}

.is-demo .plans > .plan:nth-child(2) .plan__amount--m,
.is-demo .plans > .plan:nth-child(2) .plan__unit--m {
  animation: fade-m-2 $duration $easing infinite;
}

.is-demo .plans > .plan:nth-child(2) .plan__amount--y,
.is-demo .plans > .plan:nth-child(2) .plan__unit--y {
  animation: fade-y-2 $duration $easing infinite;
}

.is-demo .plans > .plan:nth-child(3) .plan__amount--m,
.is-demo .plans > .plan:nth-child(3) .plan__unit--m {
  animation: fade-m-3 $duration $easing infinite;
}

.is-demo .plans > .plan:nth-child(3) .plan__amount--y,
.is-demo .plans > .plan:nth-child(3) .plan__unit--y {
  animation: fade-y-3 $duration $easing infinite;
}

@keyframes fade-m-1 { 0%, 25% { opacity: 1; } 30%, 100% { opacity: 0; } }
@keyframes fade-y-1 { 0%, 25% { opacity: 0; } 30%, 100% { opacity: 1; } }
@keyframes fade-m-2 { 0%, 45% { opacity: 1; } 50%, 100% { opacity: 0; } }
@keyframes fade-y-2 { 0%, 45% { opacity: 0; } 50%, 100% { opacity: 1; } }
@keyframes fade-m-3 { 0%, 65% { opacity: 1; } 70%, 100% { opacity: 0; } }
@keyframes fade-y-3 { 0%, 65% { opacity: 0; } 70%, 100% { opacity: 1; } }

@media (max-width: 340px) {
  .plans { gap: $sp-1; max-width: 300px; }
  .plan { padding: $sp-2 $sp-1; }
  .plan__amount { font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .is-demo .plans > .plan:nth-child(1) .plan__amount--m,
  .is-demo .plans > .plan:nth-child(1) .plan__amount--y,
  .is-demo .plans > .plan:nth-child(1) .plan__unit--m,
  .is-demo .plans > .plan:nth-child(1) .plan__unit--y,
  .is-demo .plans > .plan:nth-child(2) .plan__amount--m,
  .is-demo .plans > .plan:nth-child(2) .plan__amount--y,
  .is-demo .plans > .plan:nth-child(2) .plan__unit--m,
  .is-demo .plans > .plan:nth-child(2) .plan__unit--y,
  .is-demo .plans > .plan:nth-child(3) .plan__amount--m,
  .is-demo .plans > .plan:nth-child(3) .plan__amount--y,
  .is-demo .plans > .plan:nth-child(3) .plan__unit--m,
  .is-demo .plans > .plan:nth-child(3) .plan__unit--y,
  .is-demo .plan--featured {
    animation: none;
  }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ff4d1f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.pricing {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
}

.toggle {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.18);
}

.toggle__btn {
  border: 0;
  border-radius: 999px;
  padding: 4px 16px;
  font-family: inherit;
  font-weight: 600;
  font-size: 11px;
  line-height: 1.8;
  cursor: pointer;
  transition: background 300ms ease-out, color 300ms ease-out;
}

.toggle__btn.is-active {
  background: #fff7e6;
  color: #c93000;
}

.toggle__btn:not(.is-active) {
  background: transparent;
  color: #fff7e6;
}

.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 420px;
}

.plan {
  position: relative;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 8px;
  border-radius: 16px;
  background: #ffffff;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.plan--featured {
  z-index: 1;
  background: #17141a;
  transform: scale(1.08);
}

.is-demo .plan--featured {
  animation: featured-scale-in 600ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes featured-scale-in {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.08);
  }
}
.plan__badge {
  margin: 0;
  padding: 4px 8px;
  border-radius: 4px;
  background: #fff7e6;
  color: #c93000;
  font-weight: 700;
  font-size: 9px;
  line-height: 1.4;
}

.plan__name {
  margin: 0;
  color: #17141a;
  font-weight: 600;
  font-size: 12px;
  line-height: 1.4;
}

.plan--featured .plan__name {
  color: #ffffff;
}

.plan__price {
  position: relative;
  margin: 0;
  min-height: 20px;
  width: 100%;
  text-align: center;
}

.plan__amount {
  position: absolute;
  inset: 0;
  color: #17141a;
  font-weight: 700;
  font-size: 15px;
  line-height: 1.4;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 300ms ease-out;
}

.plan--featured .plan__amount {
  color: #ffffff;
}

.plan__amount--m {
  opacity: 1;
}

.plan__unit-row {
  position: relative;
  width: 100%;
  height: 13px;
  text-align: center;
}

.plan__unit {
  position: absolute;
  inset: 0;
  color: rgba(23, 20, 26, 0.72);
  font-weight: 400;
  font-size: 9px;
  line-height: 1.4;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 300ms ease-out;
}

.plan--featured .plan__unit {
  color: rgba(255, 255, 255, 0.78);
}

.plan__unit--m {
  opacity: 1;
}

.pricing.is-yearly .plan__amount--m,
.pricing.is-yearly .plan__unit--m {
  opacity: 0;
}

.pricing.is-yearly .plan__amount--y,
.pricing.is-yearly .plan__unit--y {
  opacity: 1;
}

.is-demo .plans > .plan:nth-child(1) .plan__amount--m,
.is-demo .plans > .plan:nth-child(1) .plan__unit--m {
  animation: fade-m-1 2s steps(1, end) infinite;
}

.is-demo .plans > .plan:nth-child(1) .plan__amount--y,
.is-demo .plans > .plan:nth-child(1) .plan__unit--y {
  animation: fade-y-1 2s steps(1, end) infinite;
}

.is-demo .plans > .plan:nth-child(2) .plan__amount--m,
.is-demo .plans > .plan:nth-child(2) .plan__unit--m {
  animation: fade-m-2 2s steps(1, end) infinite;
}

.is-demo .plans > .plan:nth-child(2) .plan__amount--y,
.is-demo .plans > .plan:nth-child(2) .plan__unit--y {
  animation: fade-y-2 2s steps(1, end) infinite;
}

.is-demo .plans > .plan:nth-child(3) .plan__amount--m,
.is-demo .plans > .plan:nth-child(3) .plan__unit--m {
  animation: fade-m-3 2s steps(1, end) infinite;
}

.is-demo .plans > .plan:nth-child(3) .plan__amount--y,
.is-demo .plans > .plan:nth-child(3) .plan__unit--y {
  animation: fade-y-3 2s steps(1, end) infinite;
}

@keyframes fade-m-1 {
  0%, 25% {
    opacity: 1;
  }
  30%, 100% {
    opacity: 0;
  }
}
@keyframes fade-y-1 {
  0%, 25% {
    opacity: 0;
  }
  30%, 100% {
    opacity: 1;
  }
}
@keyframes fade-m-2 {
  0%, 45% {
    opacity: 1;
  }
  50%, 100% {
    opacity: 0;
  }
}
@keyframes fade-y-2 {
  0%, 45% {
    opacity: 0;
  }
  50%, 100% {
    opacity: 1;
  }
}
@keyframes fade-m-3 {
  0%, 65% {
    opacity: 1;
  }
  70%, 100% {
    opacity: 0;
  }
}
@keyframes fade-y-3 {
  0%, 65% {
    opacity: 0;
  }
  70%, 100% {
    opacity: 1;
  }
}
@media (max-width: 340px) {
  .plans {
    gap: 4px;
    max-width: 300px;
  }
  .plan {
    padding: 8px 4px;
  }
  .plan__amount {
    font-size: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .is-demo .plans > .plan:nth-child(1) .plan__amount--m,
  .is-demo .plans > .plan:nth-child(1) .plan__amount--y,
  .is-demo .plans > .plan:nth-child(1) .plan__unit--m,
  .is-demo .plans > .plan:nth-child(1) .plan__unit--y,
  .is-demo .plans > .plan:nth-child(2) .plan__amount--m,
  .is-demo .plans > .plan:nth-child(2) .plan__amount--y,
  .is-demo .plans > .plan:nth-child(2) .plan__unit--m,
  .is-demo .plans > .plan:nth-child(2) .plan__unit--y,
  .is-demo .plans > .plan:nth-child(3) .plan__amount--m,
  .is-demo .plans > .plan:nth-child(3) .plan__amount--y,
  .is-demo .plans > .plan:nth-child(3) .plan__unit--m,
  .is-demo .plans > .plan:nth-child(3) .plan__unit--y,
  .is-demo .plan--featured {
    animation: none;
  }
}

// Billing cycle 버튼을 누르면 요금제 상태가 연간 또는 Monthly 상태가 되고, 그 상태에 따라 화면에 보이는 금액 값을 다시 계산해 표시한다.
// 계산 겹: Billing cycle 상태 -> 표시 금액 값 재계산. 실사용 클릭 리스너 있음.
(function () {
  var root = document.getElementById('pricing');
  var mBtn = document.getElementById('btn-monthly');
  var yBtn = document.getElementById('btn-yearly');
  if (!root || !mBtn || !yBtn) return;

  function setYearly(yearly) {
    root.classList.remove('is-demo');
    root.classList.toggle('is-yearly', yearly);
    mBtn.classList.toggle('is-active', !yearly);
    yBtn.classList.toggle('is-active', yearly);
    mBtn.setAttribute('aria-pressed', String(!yearly));
    yBtn.setAttribute('aria-pressed', String(yearly));
  }

  mBtn.addEventListener('click', function () { setYearly(false); });
  yBtn.addEventListener('click', function () { setYearly(true); });
})();

import { useEffect, useRef } from "react";
import styles from "./PricingCards.module.scss";

// 결제 주기 버튼을 누르면 요금제 상태가 연간 또는 월간 상태가 되고, 그 상태에 따라 화면에 보이는 금액 값을 다시 계산해 표시한다.
// 계산 겹: 결제 주기 상태 -> 표시 금액 값 재계산. 실사용 클릭 리스너 있음.
const PLANS = [
  { name: "스타터", amountM: "9,000", amountY: "7,200", featured: false },
  { name: "프로", amountM: "19,000", amountY: "15,200", featured: true },
  { name: "비즈니스", amountM: "39,000", amountY: "31,200", featured: false },
];

export default function PricingCards() {
  const rootRef = useRef<HTMLDivElement>(null);
  const mBtnRef = useRef<HTMLButtonElement>(null);
  const yBtnRef = useRef<HTMLButtonElement>(null);

  useEffect(() => {
    const root = rootRef.current;
    const mBtn = mBtnRef.current;
    const yBtn = yBtnRef.current;
    if (!root || !mBtn || !yBtn) return;

    function setYearly(yearly: boolean) {
      root!.classList.remove(styles["is-demo"]);
      root!.classList.toggle(styles["is-yearly"], yearly);
      mBtn!.classList.toggle(styles["is-active"], !yearly);
      yBtn!.classList.toggle(styles["is-active"], yearly);
      mBtn!.setAttribute("aria-pressed", String(!yearly));
      yBtn!.setAttribute("aria-pressed", String(yearly));
    }

    function onMonthly() { setYearly(false); }
    function onYearly() { setYearly(true); }

    mBtn.addEventListener("click", onMonthly);
    yBtn.addEventListener("click", onYearly);
    return () => {
      mBtn.removeEventListener("click", onMonthly);
      yBtn.removeEventListener("click", onYearly);
    };
  }, []);

  return (
    <main className={styles.stage}>
      <div ref={rootRef} className={`${styles.pricing} ${styles["is-demo"]}`}>
        <div className={styles.toggle} role="group" aria-label="결제 주기">
          <button
            ref={mBtnRef}
            className={`${styles.toggle__btn} ${styles["toggle__btn--m"]} ${styles["is-active"]}`}
            type="button"
            aria-pressed="true"
          >
            월간
          </button>
          <button
            ref={yBtnRef}
            className={`${styles.toggle__btn} ${styles["toggle__btn--y"]}`}
            type="button"
            aria-pressed="false"
          >
            연간 -20%
          </button>
        </div>
        <div className={styles.plans}>
          {PLANS.map((plan) => (
            <article
              key={plan.name}
              className={plan.featured ? `${styles.plan} ${styles["plan--featured"]}` : styles.plan}
            >
              {plan.featured && <p className={styles.plan__badge}>추천</p>}
              <p className={styles.plan__name}>{plan.name}</p>
              <div className={styles.plan__price}>
                <span className={`${styles.plan__amount} ${styles["plan__amount--m"]}`}>{plan.amountM}</span>
                <span className={`${styles.plan__amount} ${styles["plan__amount--y"]}`}>{plan.amountY}</span>
              </div>
              <div className={styles["plan__unit-row"]}>
                <span className={`${styles.plan__unit} ${styles["plan__unit--m"]}`}>원/월</span>
                <span className={`${styles.plan__unit} ${styles["plan__unit--y"]}`}>원/월(연 결제)</span>
              </div>
            </article>
          ))}
        </div>
      </div>
    </main>
  );
}