03Khối case study

<main class="stage">
  <section class="cd">
    <span class="cd__accent" aria-hidden="true"></span>
    <p class="cd__eyebrow">CASE STUDY</p>
    <h2 class="cd__title">Thiết kế lại luồng thanh toán</h2>
    <p class="cd__blurb">Rút checkout từ 5 bước còn 3 bước và vẽ lại các điểm rời bỏ.</p>
    <button class="cd__toggle" type="button" aria-expanded="false" aria-controls="cd-panel">
      Xem kết quả
    </button>
    <div class="cd__panel" id="cd-panel" role="status" aria-live="polite">
      <div class="cd__stat"><p class="cd__num" data-target="38" data-suffix="%">0%</p><p class="cd__label">Tỷ lệ chuyển đổi tăng</p></div>
      <div class="cd__stat"><p class="cd__num" data-target="6" data-suffix=" tuần">0 tuần</p><p class="cd__label">Thời gian sản xuất</p></div>
      <div class="cd__stat"><p class="cd__num" data-target="210" data-suffix="%">0%</p><p class="cd__label">Mức tăng traffic</p></div>
    </div>
  </section>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-base;                             // 패널 펼침
$easing: $ease-pop;
$color: $subject-blue;                            // 링·숫자 강조색

@include stage($stage-orange);

.cd {
  width: min(400px, 94vw);
  border-radius: $r-card;
  padding: $sp-4;
  box-sizing: border-box;
  background: rgba(255, 255, 255, .92);
  text-align: center;
}
// ── 상단 악센트 바가 계속 스캔하는 장식(항상 재생) ──────────────
.cd__accent {
  display: block;
  width: 160px; height: 4px;
  margin: 0 auto $sp-2;
  border-radius: $r-xs;
  background: $color;
  transform-origin: center;
  animation: cd-scan 2s $easing infinite;
}
@keyframes cd-scan {
  0%, 70%, 100% { transform: scaleX(.3); opacity: .5; }
  30%           { transform: scaleX(1); opacity: 1; }
}

.cd__eyebrow {
  margin: 0 0 $sp-1;
  font-weight: 700; font-size: 10px; line-height: 1; font-family: inherit;
  letter-spacing: .14em;
  color: rgba($subject-ink, .72);                 // 페이퍼 면 위 6.92:1
}
.cd__title { margin: 0 0 $sp-1; font-weight: 800; font-size: clamp(14px, 4vw, 17px); line-height: 1.2; font-family: inherit; color: $subject-ink; }
.cd__blurb { margin: 0 0 $sp-3; font-weight: 500; font-size: clamp(10px, 2.8vw, 11px); line-height: 1.4; font-family: inherit; color: rgba(23, 20, 26, .6); }

.cd__toggle {
  position: relative;
  display: inline-flex; align-items: center; gap: $sp-1;
  padding: $sp-1 $sp-4;
  border-radius: $r-pill;
  border: 1px solid rgba(23, 20, 26, .18);
  background: none;
  color: $subject-ink;
  font-weight: 700; font-size: 11px; line-height: 1.6; font-family: inherit;
  cursor: pointer;
}
.cd__panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: $sp-2;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  box-sizing: border-box;
  margin-top: 0;
  transition: max-height $duration $easing, opacity $duration $easing, margin-top $duration $easing;
}
.cd__panel.is-open {
  max-height: 120px;
  opacity: 1;
  margin-top: $sp-3;
}
.cd__num {
  margin: 0;
  font-weight: 800; font-size: clamp(15px, 4.4vw, 18px); line-height: 1; font-family: inherit;
  color: $color;
  font-variant-numeric: tabular-nums;
}
.cd__label { margin: $sp-1 0 0; font-weight: 600; font-size: 9px; line-height: 1.3; font-family: inherit; color: rgba($subject-ink, .72); } // 5.7:1 — .5 는 3.4 로 미달

// ── 반응형(BD9) ──────────────────────────────────────────
@media (max-width: 340px), (max-height: 220px) {
  .cd { padding: $sp-3; }
  .cd__blurb { display: none; }
  .cd__label { display: none; }
}

// ── 접근성 ──────────────────────────────────────────
@media (prefers-reduced-motion: reduce) {
  .cd__accent { animation: none !important; }
  .cd__panel { transition: 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);
}

.cd {
  width: min(400px, 94vw);
  border-radius: 16px;
  padding: 16px;
  box-sizing: border-box;
  background: rgba(255, 255, 255, 0.92);
  text-align: center;
}

.cd__accent {
  display: block;
  width: 160px;
  height: 4px;
  margin: 0 auto 8px;
  border-radius: 4px;
  background: #2f6df6;
  transform-origin: center;
  animation: cd-scan 2s cubic-bezier(0.2, 1.4, 0.4, 1) infinite;
}

@keyframes cd-scan {
  0%, 70%, 100% {
    transform: scaleX(0.3);
    opacity: 0.5;
  }
  30% {
    transform: scaleX(1);
    opacity: 1;
  }
}
.cd__eyebrow {
  margin: 0 0 4px;
  font-weight: 700;
  font-size: 10px;
  line-height: 1;
  font-family: inherit;
  letter-spacing: 0.14em;
  color: rgba(23, 20, 26, 0.72);
}

.cd__title {
  margin: 0 0 4px;
  font-weight: 800;
  font-size: clamp(14px, 4vw, 17px);
  line-height: 1.2;
  font-family: inherit;
  color: #17141a;
}

.cd__blurb {
  margin: 0 0 12px;
  font-weight: 500;
  font-size: clamp(10px, 2.8vw, 11px);
  line-height: 1.4;
  font-family: inherit;
  color: rgba(23, 20, 26, 0.6);
}

.cd__toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 16px;
  border-radius: 999px;
  border: 1px solid rgba(23, 20, 26, 0.18);
  background: none;
  color: #17141a;
  font-weight: 700;
  font-size: 11px;
  line-height: 1.6;
  font-family: inherit;
  cursor: pointer;
}

.cd__panel {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  box-sizing: border-box;
  margin-top: 0;
  transition: max-height 300ms cubic-bezier(0.2, 1.4, 0.4, 1), opacity 300ms cubic-bezier(0.2, 1.4, 0.4, 1), margin-top 300ms cubic-bezier(0.2, 1.4, 0.4, 1);
}

.cd__panel.is-open {
  max-height: 120px;
  opacity: 1;
  margin-top: 12px;
}

.cd__num {
  margin: 0;
  font-weight: 800;
  font-size: clamp(15px, 4.4vw, 18px);
  line-height: 1;
  font-family: inherit;
  color: #2f6df6;
  font-variant-numeric: tabular-nums;
}

.cd__label {
  margin: 4px 0 0;
  font-weight: 600;
  font-size: 9px;
  line-height: 1.3;
  font-family: inherit;
  color: rgba(23, 20, 26, 0.72);
}

@media (max-width: 340px), (max-height: 220px) {
  .cd {
    padding: 12px;
  }
  .cd__blurb {
    display: none;
  }
  .cd__label {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cd__accent {
    animation: none !important;
  }
  .cd__panel {
    transition: none;
  }
}

// 실제 동작: "Xem kết quả"를 누르면 패널이 실제로 펼쳐지고, 숫자 세 개가 0에서 목표값까지 올라간다.
var btn = document.querySelector('.cd__toggle');
var panel = document.querySelector('.cd__panel');
var nums = panel.querySelectorAll('.cd__num');
var hasCounted = false;

function countUp() {
  if (hasCounted) return;
  hasCounted = true;
  var startTime = performance.now();
  var duration = 900;
  function easeOut(t) { return 1 - Math.pow(1 - t, 3); }
  function tick(now) {
    var t = Math.min(1, (now - startTime) / duration);
    var e = easeOut(t);
    nums.forEach(function (el) {
      var target = Number(el.getAttribute('data-target'));
      var suffix = el.getAttribute('data-suffix');
      el.textContent = Math.round(target * e) + suffix;
    });
    if (t < 1) requestAnimationFrame(tick);
  }
  requestAnimationFrame(tick);
}

btn.addEventListener('click', function () {
  var open = btn.getAttribute('aria-expanded') === 'true';
  btn.setAttribute('aria-expanded', String(!open));
  panel.classList.toggle('is-open', !open);
  if (!open) countUp();
});

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

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

const STATS = [
  { target: 38, suffix: "%", label: "전환율 상승" },
  { target: 6, suffix: "주", label: "제작 기간" },
  { target: 210, suffix: "%", label: "트래픽 증가" },
];

export default function ProjectCaseDetail({ duration = 300, easing = "cubic-bezier(.2,1.4,.4,1)", color = "#2f6df6" }: ProjectCaseDetailProps) {
  const [open, setOpen] = useState(false);
  const [nums, setNums] = useState(STATS.map(() => 0));
  const played = useRef(false);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  // 실제 동작: "결과 보기"를 누르면 패널이 실제로 펼쳐지고, 숫자 세 개가 0에서 목표값까지 올라간다.
  function countUp() {
    if (played.current) return;
    played.current = true;
    const start = performance.now();
    const len = 900;
    const easeOut = (t: number) => 1 - Math.pow(1 - t, 3);
    function tick(now: number) {
      const t = Math.min(1, (now - start) / len);
      const e = easeOut(t);
      setNums(STATS.map((s) => Math.round(s.target * e)));
      if (t < 1) requestAnimationFrame(tick);
    }
    requestAnimationFrame(tick);
  }

  function toggle() {
    const next = !open;
    setOpen(next);
    if (next) countUp();
  }

  return (
    <section className={styles.cd} style={vars}>
      <span className={styles.accent} aria-hidden="true" />
      <p className={styles.eyebrow}>CASE STUDY</p>
      <h2 className={styles.title}>결제 플로우 리디자인</h2>
      <p className={styles.blurb}>결제 단계 5→3단계로 줄이고, 이탈 지점을 다시 그렸습니다.</p>
      <button type="button" className={styles.toggle} aria-expanded={open} onClick={toggle}>
        결과 보기
      </button>
      <div className={`${styles.panel} ${open ? styles.panelOpen : ""}`} role="status" aria-live="polite">
        {STATS.map((s, i) => (
          <div key={s.label} className={styles.stat}>
            <p className={styles.num}>{nums[i]}{s.suffix}</p>
            <p className={styles.label}>{s.label}</p>
          </div>
        ))}
      </div>
    </section>
  );
}