04Recommended plan grows, neighbors step back

<main class="stage">
  <div class="pr is-demo">
    <div class="pr__row">
      <button class="pr__card" type="button" data-plan="starter">
        <span class="pr__name">Starter</span>
        <span class="pr__price">
          <span class="pr__amount">$9</span>
          <span class="pr__unit">/ mo</span>
        </span>
      </button>
      <button class="pr__card pr__card--pick" type="button" data-plan="pro">
        <span class="pr__ribbon">Popular</span>
        <span class="pr__name">Pro</span>
        <span class="pr__price">
          <span class="pr__amount">$29</span>
          <span class="pr__unit">/ mo</span>
        </span>
      </button>
      <button class="pr__card" type="button" data-plan="business">
        <span class="pr__name">Business</span>
        <span class="pr__price">
          <span class="pr__amount">$79</span>
          <span class="pr__unit">/ mo</span>
        </span>
      </button>
    </div>
  </div>
</main>

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

$duration: $dur-quick;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-paper);

.pr {
  box-sizing: border-box;
  width: min(440px, 92vw);
  // 리본은 카드 위로 삐져나온다. 절대배치는 부모 높이 계산에서 빠지지만 scrollHeight 에는 잡히니
  // 뿌리에서 그만큼(리본 16px + 카드가 뜨는 6px + scale 여유)을 미리 비워 둔다
  padding-top: $sp-8;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $subject-ink;
}

// 균등 칸은 grid 1fr 로 — flex: 1 1 0 위에 고정 px 를 올리지 않는다
.pr__row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: $sp-2;
  align-items: stretch;
}

.pr__card {
  position: relative;
  box-sizing: border-box;
  margin: 0;
  padding: $sp-4 $sp-2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: $sp-2;
  border: 2px solid rgba(0, 0, 0, .12);
  border-radius: $r-card;
  background-color: rgba(0, 0, 0, .03);
  color: $subject-ink;
  font-family: inherit;
  cursor: pointer;
  transform: scale(1);
  transform-origin: 50% 100%; // 규칙8: 카드 석 장이 한 바닥선을 딛고 커진다 — 여백은 리본 쪽(위)만 비워 뒀다
  transition: transform $duration $easing;
}
// 가운데 추천 카드만 색을 채운다 — 리본과 한 덩어리로 읽힌다
.pr__card--pick {
  border-color: $color;
  background-color: $color;
  color: $stage-paper;   // 크림은 이 파랑 위에서 4.25:1 로 모자란다 — 순백이어야 4.53:1 로 기준을 넘는다
  box-shadow: $shadow-raised;
}
.pr__card--pick .pr__unit { opacity: 1; }   // 72% 로 옅게 두면 3.10:1 로 떨어진다
.pr__card:focus-visible { outline: 2px solid $color; outline-offset: 2px; }

.pr__name {
  font-size: 12px;
  line-height: 18px;
  font-weight: 700;
}
.pr__price {
  display: flex;
  align-items: baseline;
  gap: $sp-1;
}
.pr__amount {
  font-size: 22px;
  line-height: 28px;
  font-weight: 800;
}
.pr__unit {
  font-size: 11px;
  line-height: 16px;
  font-weight: 600;
  opacity: .72;
}

// 비스듬한 리본 — left/right 0 + auto 여백으로 가운데를 잡아 두면 transform 은 회전만 맡는다
.pr__ribbon {
  position: absolute;
  top: -16px;
  left: 0;
  right: 0;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
  padding: $sp-1 $sp-3;
  border-radius: $r-pill;
  background-color: $subject-ink;
  color: $subject-cream;
  font-size: 11px;
  line-height: 16px;
  font-weight: 800;
  white-space: nowrap;
  box-shadow: $shadow-press;
  transform: rotate(-8deg);
  transform-origin: 50% 50%;
}

// ── 이웃이 물러난다 — :has() 로 줄 전체를 줄이고, 그 위에 호버한 카드만 앞으로 ──
// 물러나는 규칙이 :has() 때문에 더 구체적이라, 앞으로 나오는 규칙에도 같은 :has() 를 붙여야 이긴다
.pr__row:has(.pr__card:hover) .pr__card,
.pr__row:has(.pr__card:focus-within) .pr__card { transform: scale(.94); }
.pr__row:has(.pr__card:hover) .pr__card:hover,
.pr__row:has(.pr__card:focus-within) .pr__card:focus-within { transform: scale(1.06); }

// ── 자동 루프: 세 카드가 왼쪽부터 차례로 올라왔다 내려간다 ──
// 시차는 animation-delay 로, 늦게 시작하는 카드가 0프레임에 완성 상태로 번쩍이지 않게 fill-mode: backwards
.pr.is-demo .pr__card {
  animation-name: pr-lift;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}
.pr.is-demo .pr__card[data-plan="starter"]  { animation-delay: 0ms; }
.pr.is-demo .pr__card[data-plan="pro"]      { animation-delay: 300ms; }
.pr.is-demo .pr__card[data-plan="business"] { animation-delay: 600ms; }
@keyframes pr-lift {
  0%   { transform: translateY(0) scale(1); }
  14%  { transform: translateY(-6px) scale(1.05); }
  34%  { transform: translateY(0) scale(1); }
  100% { transform: translateY(0) scale(1); }
}

// 리본은 추천 카드와 같은 시계로 한 번 더 기울었다 돌아온다
.pr.is-demo .pr__ribbon {
  animation-name: pr-ribbon;
  animation-duration: $dur-loop;
  animation-timing-function: $easing;
  animation-iteration-count: infinite;
  animation-delay: 300ms;
  animation-fill-mode: backwards;
}
@keyframes pr-ribbon {
  0%   { transform: rotate(-8deg) scale(1); }
  14%  { transform: rotate(-13deg) scale(1.1); }
  34%  { transform: rotate(-8deg) scale(1); }
  100% { transform: rotate(-8deg) scale(1); }
}

@media (max-width: 340px) {
  // padding-top 은 줄이지 않는다 — 리본이 나가는 높이는 화면이 좁아져도 그대로다
  .pr__row { gap: $sp-1; }
  .pr__card { padding: $sp-3 $sp-1; gap: $sp-1; }
  .pr__name { font-size: 11px; line-height: 16px; }
  .pr__amount { font-size: 18px; line-height: 24px; }
  .pr__unit { font-size: 10px; line-height: 14px; }
  .pr__ribbon { top: -12px; padding: 0 $sp-2; font-size: 10px; line-height: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .pr__card { transition: none; }
  .pr.is-demo .pr__card,
  .pr.is-demo .pr__ribbon { animation: none !important; }
  .pr.is-demo .pr__ribbon { transform: rotate(-8deg); }
}

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);
}

.pr {
  box-sizing: border-box;
  width: min(440px, 92vw);
  padding-top: 32px;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #17141a;
}

.pr__row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  align-items: stretch;
}

.pr__card {
  position: relative;
  box-sizing: border-box;
  margin: 0;
  padding: 16px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 2px solid rgba(0, 0, 0, 0.12);
  border-radius: 16px;
  background-color: rgba(0, 0, 0, 0.03);
  color: #17141a;
  font-family: inherit;
  cursor: pointer;
  transform: scale(1);
  transform-origin: 50% 100%;
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.pr__card--pick {
  border-color: #2f6df6;
  background-color: #2f6df6;
  color: #ffffff;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.pr__card--pick .pr__unit {
  opacity: 1;
}

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

.pr__name {
  font-size: 12px;
  line-height: 18px;
  font-weight: 700;
}

.pr__price {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.pr__amount {
  font-size: 22px;
  line-height: 28px;
  font-weight: 800;
}

.pr__unit {
  font-size: 11px;
  line-height: 16px;
  font-weight: 600;
  opacity: 0.72;
}

.pr__ribbon {
  position: absolute;
  top: -16px;
  left: 0;
  right: 0;
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
  padding: 4px 12px;
  border-radius: 999px;
  background-color: #17141a;
  color: #fff7e6;
  font-size: 11px;
  line-height: 16px;
  font-weight: 800;
  white-space: nowrap;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  transform: rotate(-8deg);
  transform-origin: 50% 50%;
}

.pr__row:has(.pr__card:hover) .pr__card,
.pr__row:has(.pr__card:focus-within) .pr__card {
  transform: scale(0.94);
}

.pr__row:has(.pr__card:hover) .pr__card:hover,
.pr__row:has(.pr__card:focus-within) .pr__card:focus-within {
  transform: scale(1.06);
}

.pr.is-demo .pr__card {
  animation-name: pr-lift;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
  animation-fill-mode: backwards;
}

.pr.is-demo .pr__card[data-plan=starter] {
  animation-delay: 0ms;
}

.pr.is-demo .pr__card[data-plan=pro] {
  animation-delay: 300ms;
}

.pr.is-demo .pr__card[data-plan=business] {
  animation-delay: 600ms;
}

@keyframes pr-lift {
  0% {
    transform: translateY(0) scale(1);
  }
  14% {
    transform: translateY(-6px) scale(1.05);
  }
  34% {
    transform: translateY(0) scale(1);
  }
  100% {
    transform: translateY(0) scale(1);
  }
}
.pr.is-demo .pr__ribbon {
  animation-name: pr-ribbon;
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
  animation-delay: 300ms;
  animation-fill-mode: backwards;
}

@keyframes pr-ribbon {
  0% {
    transform: rotate(-8deg) scale(1);
  }
  14% {
    transform: rotate(-13deg) scale(1.1);
  }
  34% {
    transform: rotate(-8deg) scale(1);
  }
  100% {
    transform: rotate(-8deg) scale(1);
  }
}
@media (max-width: 340px) {
  .pr__row {
    gap: 4px;
  }
  .pr__card {
    padding: 12px 4px;
    gap: 4px;
  }
  .pr__name {
    font-size: 11px;
    line-height: 16px;
  }
  .pr__amount {
    font-size: 18px;
    line-height: 24px;
  }
  .pr__unit {
    font-size: 10px;
    line-height: 14px;
  }
  .pr__ribbon {
    top: -12px;
    padding: 0 8px;
    font-size: 10px;
    line-height: 16px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .pr__card {
    transition: none;
  }
  .pr.is-demo .pr__card,
  .pr.is-demo .pr__ribbon {
    animation: none !important;
  }
  .pr.is-demo .pr__ribbon {
    transform: rotate(-8deg);
  }
}

// 실제 동작은 전부 CSS 가 한다 — .row:has(.card:hover) 가 줄 전체를 물러나게 하고 호버한 카드만 앞으로 나온다.
// JS 가 맡는 일은 하나뿐: 사람이 건드린 순간 자동 루프(is-demo)를 끈다.
var root = document.querySelector('.pr');
var row = document.querySelector('.pr__row');
function stop() { root.classList.remove('is-demo'); }
row.addEventListener('pointerenter', stop);
row.addEventListener('focusin', stop);
row.addEventListener('click', stop);

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

export type RibbonPlan = { id: string; name: string; amount: string; picked?: boolean };
export type RecommendedRibbonProps = {
  plans?: RibbonPlan[];
  unit?: string;
  ribbon?: string;
  duration?: number;
  easing?: string;
  color?: string;
  /** 한 카드가 올라오고 다음 카드가 올라오기까지의 시차 */
  stagger?: number;
};

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

const PLANS: RibbonPlan[] = [
  { id: "starter", name: "Starter", amount: "$9" },
  { id: "pro", name: "Pro", amount: "$29", picked: true },
  { id: "business", name: "Business", amount: "$79" },
];

export default function RecommendedRibbon({
  plans = PLANS,
  unit = "/ mo",
  ribbon = "Popular",
  duration = 220,
  easing = "cubic-bezier(.2, .8, .2, 1)",
  color = "#2f6df6",
  stagger = 300,
}: RecommendedRibbonProps) {
  const [demo, setDemo] = useState(true);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };
  // 사람이 건드리면 자동 루프를 끈다 — 호버로 물러나고 앞으로 나오는 일은 CSS :has() 가 맡는다
  const stop = () => setDemo(false);

  return (
    <div className={`${styles.pr} ${demo ? styles.isDemo : ""}`} style={vars}>
      <div className={styles.row} onPointerEnter={stop} onFocus={stop} onClick={stop}>
        {plans.map((p, i) => (
          <button
            key={p.id}
            type="button"
            className={`${styles.card} ${p.picked ? styles.picked : ""}`}
            style={{ "--d": `${i * stagger}ms` } as CardVars}
          >
            {p.picked ? <span className={styles.ribbon}>{ribbon}</span> : null}
            <span className={styles.name}>{p.name}</span>
            <span className={styles.price}>
              <span className={styles.amount}>{p.amount}</span>
              <span className={styles.unit}>{unit}</span>
            </span>
          </button>
        ))}
      </div>
    </div>
  );
}