:root{--build-id:"45dfc378-49ed-4966-96fc-7f0cd24e5494";}
/* F3: Windows Core 폰트 스택 */
:root {
  --primary: #6366f1;
  --bg: #eef2ff;
  --text: #312e81;
  --accent: #818cf8;
  --heading: var(--text);
  --link: var(--text);
  --font-main: "Segoe UI", "Malgun Gothic", "Noto Sans KR", -apple-system, system-ui, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.65;
  font-weight: 400;
  letter-spacing: 0em;
  color: var(--text);
  background-color: var(--bg);
}

/* H13: 헤딩 스타일 */
h1 {
  font-size: clamp(2rem, 5vw, 3.125rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: 0;
  color: var(--heading);
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.344rem);
  font-weight: 600;
  line-height: 1.3;
  color: var(--heading);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.758rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--heading);
}

a {
  color: var(--link);
  text-decoration: none;
}

/* N05: 상단 투명 네비게이션 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(238, 242, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid rgba(99, 102, 241, 0.1);
}

.nav-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.nav-menu {
  display: flex;
  gap: 2.5rem;
  align-items: center;
  list-style: none;
}

.nav-menu a {
  font-weight: 500;
  transition: color 0.3s;
}

.nav-menu a:hover {
  color: var(--primary);
}

.nav-menu a[aria-current="page"] {
  color: var(--primary);
  font-weight: 600;
}

/* B13: 버튼 스타일 */
.cta-button {
  border: none;
  border-bottom: 3px solid var(--primary);
  padding: 0.75rem 0;
  font-weight: 700;
  text-transform: uppercase;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  transition: all 0.3s;
  font-family: var(--font-main);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
}

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

.hamburger {
  display: none;
  flex-direction: column;
  gap: 0.35rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger span {
  width: 1.5rem;
  height: 2px;
  background: var(--primary);
  transition: all 0.3s;
}

/* S05: 섹션 여백 */
.section {
  padding: 7rem 2rem;
}

.container {
  max-width: 1500px;
  margin: 0 auto;
}

/* L27: 임팩트 히어로 */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 10rem 2rem 7rem;
  background: linear-gradient(135deg, var(--bg) 0%, #ffffff 100%);
}

.hero-content {
  max-width: 900px;
}

.hero h1 {
  margin-bottom: 1.5rem;
  font-size: clamp(2.5rem, 6vw, 4rem);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2.5rem;
  color: var(--text);
  opacity: 0.9;
}

/* 4열 그리드 */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 5rem;
}

/* K13: 카드 스타일 */
.card {
  border-radius: 0.5rem;
  box-shadow: 4px 4px 0 rgba(99, 102, 241, 0.15);
  padding: 2rem;
  background: #ffffff;
  transition: all 0.3s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 6px 6px 0 rgba(99, 102, 241, 0.2);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1.25rem;
  display: block;
}

.card h3 {
  margin-bottom: 1rem;
}

.card p {
  color: var(--text);
  opacity: 0.85;
}

/* 버튼 그룹 */
.button-group {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 3rem;
}

/* 푸터 */
.footer {
  background: #ffffff;
  padding: 3rem 2rem 2rem;
  border-top: 1px solid rgba(99, 102, 241, 0.1);
}

.footer-content {
  max-width: 1500px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  margin-bottom: 1rem;
  font-size: 1.125rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.75rem;
}

.footer-section a:hover {
  color: var(--primary);
}

.footer-bottom {
  max-width: 1500px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(99, 102, 241, 0.1);
  text-align: center;
  font-size: 0.875rem;
  opacity: 0.7;
}

/* 접근성 */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary);
  color: #ffffff;
  padding: 0.5rem 1rem;
  text-decoration: none;
  z-index: 100;
}

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

/* 반응형 */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    flex-direction: column;
    background: rgba(238, 242, 255, 0.98);
    width: 100%;
    padding: 2rem;
    gap: 1.5rem;
    transition: left 0.3s;
    align-items: flex-start;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }

  .nav-menu.active {
    left: 0;
  }

  .hamburger {
    display: flex;
  }

  .section {
    padding: 4rem 1.5rem;
  }

  .hero {
    padding: 8rem 1.5rem 4rem;
  }

  .grid-4 {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .button-group {
    flex-direction: column;
    gap: 1rem;
  }

  .cta-button {
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .nav-container {
    padding: 1rem 1.5rem;
  }

  .logo {
    font-size: 1.25rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }
}