/* ================================================
   데이터 인사이트랩 (Data Insight Lab) 스타일시트
   컬러 시스템: Primary 블루, Accent 그린, 화이트 배경
   ================================================ */

/* === CSS 변수 === */
:root {
  --color-primary: #1E60C9;
  --color-primary-dark: #174EA3;
  --color-primary-light: #EBF1FB;
  --color-accent: #10B981;
  --color-accent-dark: #0D9668;
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-bg: #FFFFFF;
  --color-bg-gray: #F9FAFB;
  --color-border: #E5E7EB;
  --font-sans: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-width: 1080px;
  --header-height: 64px;
}

/* === 리셋 및 기본 === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-dark);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === 헤더 === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-weight: 700;
}

.logo:hover {
  color: var(--color-text);
}

.logo-text {
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-nav a {
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
}

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

.nav-cta {
  background: var(--color-primary);
  color: var(--color-bg) !important;
  padding: 8px 20px;
  border-radius: 6px;
  font-weight: 500;
}

.nav-cta:hover {
  background: var(--color-primary-dark);
  color: var(--color-bg) !important;
}

/* === 히어로 섹션 === */
.hero {
  padding: 100px 0 80px;
  text-align: center;
}

.hero-tagline {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--color-text-light);
  margin-bottom: 40px;
  line-height: 1.6;
}

.hero-cta {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-bg) !important;
  padding: 14px 36px;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  transition: background 0.2s, transform 0.2s;
}

.hero-cta:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

/* === 핵심 차별점 섹션 === */
.strengths {
  padding: 80px 0;
  background: var(--color-bg-gray);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 48px;
  color: var(--color-text);
}

.strengths-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.strength-card {
  background: var(--color-bg);
  border-radius: 12px;
  padding: 36px 28px;
  border: 1px solid var(--color-border);
  transition: box-shadow 0.2s;
}

.strength-card:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.strength-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--color-primary);
  font-size: 1.5rem;
}

.strength-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.strength-card p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* === 프로젝트 실적 섹션 === */
.projects {
  padding: 80px 0;
  background: var(--color-bg);
}

.section-subtitle {
  text-align: center;
  font-size: 1rem;
  color: var(--color-text-light);
  margin-top: -36px;
  margin-bottom: 48px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 28px 24px;
  color: var(--color-text);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.project-card:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.project-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.project-field {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 16px;
}

.project-stack {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  margin-top: auto;
  transition: color 0.2s;
}

.project-card:hover .project-link {
  color: var(--color-primary);
}

/* === 대표 소개 + 문의 섹션 === */
.about-contact {
  padding: 80px 0;
}

.about-contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.about h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.about p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 12px;
}

.about .tech-stack {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.tech-tag {
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.contact-box {
  background: var(--color-bg-gray);
  border-radius: 12px;
  padding: 36px;
  border: 1px solid var(--color-border);
}

.contact-box h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  font-size: 0.95rem;
}

.contact-item + .contact-item {
  border-top: 1px solid var(--color-border);
}

.contact-label {
  color: var(--color-text-light);
  min-width: 60px;
}

.contact-value a {
  font-weight: 500;
}

/* === 서비스 페이지 === */
.page-header {
  padding: 60px 0 40px;
  text-align: center;
  background: var(--color-bg-gray);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-header p {
  font-size: 1.05rem;
  color: var(--color-text-light);
}

.services-list {
  padding: 60px 0;
}

.service-item {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-border);
}

.service-item:last-child {
  border-bottom: none;
}

.service-number {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.service-item h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--color-text);
}

.service-detail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.service-detail-block h3 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.service-detail-block p {
  font-size: 0.95rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* === 서비스 CTA === */
.services-cta {
  padding: 60px 0;
  text-align: center;
  background: var(--color-bg-gray);
}

.services-cta h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.services-cta p {
  color: var(--color-text-light);
  margin-bottom: 28px;
}

/* === 푸터 === */
.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-gray);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

.footer-brand span {
  color: var(--color-text-light);
}

.footer-contact {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
}

.footer-divider {
  color: var(--color-border);
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--color-text-light);
  text-align: center;
}

/* === 반응형: 태블릿 === */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .strengths-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .projects-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .about-contact-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .service-detail {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .footer-content {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

/* === 반응형: 모바일 === */
@media (max-width: 480px) {
  .hero {
    padding: 60px 0 50px;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .site-nav {
    gap: 16px;
  }

  .section-title {
    font-size: 1.4rem;
  }
}