/* Re:Born Medical AI - Professional Homepage */
:root {
  --primary: #2c3e50;
  --secondary: #3498db;
  --accent: #e74c3c;
  --hero-gradient: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
  --vision-gradient: linear-gradient(135deg, #1a252f 0%, #2980b9 100%);
}

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  color: #333;
  overflow-x: hidden;
}

/* 네비게이션 */
#mainNav {
  background: transparent;
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

#mainNav.navbar-scrolled {
  background-color: rgba(44, 62, 80, 0.95);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

#mainNav .navbar-brand {
  font-size: 1.15rem;
}

#mainNav .nav-link {
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9) !important;
  transition: color 0.2s ease;
}

#mainNav .nav-link:hover {
  color: #fff !important;
}

#mainNav .navbar-toggler {
  color: rgba(255, 255, 255, 0.9);
}

/* Hero */
.hero {
  background: var(--hero-gradient);
  position: relative;
}

.hero h1 {
  letter-spacing: -0.02em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
}

.hero .lead {
  font-weight: 400;
  letter-spacing: -0.01em;
}

.hero .btn-light:hover {
  background: #fff;
  color: var(--secondary);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* KPI 아이콘 */
.kpi-icon {
  width: 64px;
  height: 64px;
}

/* 아키텍처 플로우 */
.flow-num {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

/* 데이터 구성 */
.data-dot {
  width: 12px;
  height: 12px;
}

/* 비전 섹션 */
.vision-section {
  background: var(--vision-gradient);
}

.vision-quote {
  line-height: 1.6;
  letter-spacing: -0.01em;
}

/* 카드 호버 */
.card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08) !important;
}

/* 섹션 제목 */
section h2 {
  color: var(--primary);
  letter-spacing: -0.02em;
}

/* 푸터 */
footer a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}

footer a:hover {
  color: #fff;
}

/* 반응형 보조 */
@media (max-width: 991.98px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero .lead {
    font-size: 1.25rem !important;
  }

  .vision-quote {
    font-size: 1.35rem !important;
  }
}

@media (max-width: 575.98px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero .lead {
    font-size: 1.1rem !important;
  }
}