:root{--build-id:"fd0dae63-2214-40ac-9149-5949c79be972";}
/* F3: Windows Core 폰트 스택 */
body {
  font-family: "Segoe UI", "Malgun Gothic", "Noto Sans KR", -apple-system, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  font-weight: 400;
  letter-spacing: 0em;
  margin: 0;
  padding: 0;
  color: var(--text);
  background: var(--bg);
}

/* C34: 중성/다크 색상 */
:root {
  --primary: #1e293b;
  --bg: #f1f5f9;
  --text: #0f172a;
  --accent: #64748b;
  --heading: #0f172a;
  --link: #0f172a;
}

/* H18: 헤딩 스타일 */
h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0.005em;
  color: var(--heading);
  margin: 0 0 1.5rem 0;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.2rem);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.005em;
  color: var(--heading);
  margin: 0 0 1.25rem 0;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 1.925rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0.005em;
  color: var(--heading);
  margin: 0 0 1rem 0;
}

p {
  margin: 0 0 1.25rem 0;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--accent);
}

/* 접근성: Skip Link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #000;
  color: #fff;
  padding: 8px 16px;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* 접근성: 키보드 포커스 */
a:focus-visible,
input:focus-visible,
label:focus-visible {
  outline: 3px solid #0066cc;
  outline-offset: 2px;
}

/* N05: 상단 투명 + 좌측 로고 + 우측 메뉴+CTA */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(241, 245, 249, 0.95);
  backdrop-filter: blur(10px);
  z-index: 50;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.header-container {
  max-width: 1450px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.menu-checkbox {
  display: none;
}

.menu-toggle {
  display: none;
  font-size: 2rem;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--primary);
}

nav ul {
  display: flex;
  gap: 2rem;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--accent);
}

/* B18: 미니멀 버튼 */
.btn {
  border-bottom: 2px solid var(--primary);
  background: transparent;
  padding: 0.5rem 0;
  font-weight: 500;
  color: var(--primary);
  text-decoration: none;
  display: inline-block;
  transition: all 0.2s;
}

.btn:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* 모바일 메뉴 */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }

  nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg);
    display: none;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }

  .menu-checkbox:checked + .menu-toggle + nav {
    display: block;
  }

  nav ul {
    flex-direction: column;
    gap: 0;
    padding: 1rem 0;
  }

  nav li {
    width: 100%;
    text-align: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  }
}

/* S09: 섹션 여백 */
section {
  padding: 6.5rem 1.5rem;
}

.container {
  max-width: 1450px;
  margin: 0 auto;
}

/* L29: 데이터 중심 레이아웃 */
.hero {
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--bg) 0%, rgba(100, 116, 139, 0.1) 100%);
  margin-top: 4rem;
}

.hero-content {
  max-width: 800px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 4.5rem;
  margin: 4.5rem 0;
}

/* K18: 미니멀 카드 */
.stat-card {
  background: transparent;
  border-left: 3px solid var(--primary);
  padding: 1.5rem 0 1.5rem 1.5rem;
  transition: all 0.3s;
}

.stat-card:hover {
  border-left-color: var(--accent);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 1.1rem;
  color: var(--text);
}

.chart-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 4.5rem;
}

.chart-item {
  background: #fff;
  padding: 2rem;
  border-radius: 0.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.data-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
}

.data-list li {
  padding: 1rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.data-list li:last-child {
  border-bottom: none;
}

/* Footer */
footer {
  background: var(--primary);
  color: #fff;
  padding: 3rem 1.5rem 2rem;
  margin-top: 6.5rem;
}

.footer-container {
  max-width: 1450px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  justify-content: space-between;
}

.footer-section h3 {
  color: #fff;
  margin-bottom: 1rem;
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  display: block;
  margin-bottom: 0.5rem;
}

.footer-section a:hover {
  color: #fff;
}

.footer-bottom {
  text-align: center;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 255, 0.6);
}

/* 문서 페이지 (Privacy/Terms) */
.doc-container {
  max-width: 800px;
  margin: 8rem auto 4rem;
  padding: 2rem;
  text-align: center;
}

/* 반응형 */
@media (max-width: 768px) {
  section {
    padding: 4rem 1rem;
  }

  .stats-grid,
  .chart-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero {
    min-height: 60vh;
    margin-top: 3rem;
  }
}

/* SVG 스타일 */
.icon-svg {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
}

/* 추가 유틸리티 */
.text-center {
  text-align: center;
}

.mb-4 {
  margin-bottom: 4.5rem;
}

.mt-4 {
  margin-top: 4.5rem;
}