/* ===== CSS Variables ===== */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --accent: #f59e0b;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 12px;
  --radius-sm: 8px;
  --nav-height: 64px;
  --max-width: 1200px;
  --transition: 0.2s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Navigation ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--nav-height);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
  transition: color var(--transition), background var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: rgba(37,99,235,0.06);
}

/* Services dropdown */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 8px;
  min-width: 200px;
  z-index: 100;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 8px 14px;
  font-size: 0.875rem;
  color: var(--text);
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav-dropdown-menu a:hover {
  background: rgba(37,99,235,0.06);
  color: var(--primary);
}

.nav-cta {
  margin-left: 8px;
  padding: 8px 20px;
  background: var(--primary);
  color: #fff !important;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition);
}

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

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Mobile nav */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--card);
  padding: 20px;
  overflow-y: auto;
  z-index: 999;
}

.nav-mobile.open { display: block; }

.nav-mobile a {
  display: block;
  padding: 12px 16px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text);
  border-radius: var(--radius-sm);
}

.nav-mobile a:hover { background: rgba(37,99,235,0.06); color: var(--primary); }

.nav-mobile-section-title {
  padding: 12px 16px 4px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-lighter);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-mobile-cta {
  display: block;
  margin: 16px;
  padding: 14px;
  text-align: center;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* ===== Sections ===== */
.section {
  padding: 48px 0;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  color: var(--text);
}

.section-subtitle {
  text-align: center;
  color: var(--text-light);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* ===== Hero ===== */
.hero {
  padding: 80px 0 64px;
  text-align: center;
  background: linear-gradient(180deg, #eff6ff 0%, var(--bg) 100%);
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 16px;
}

.hero-title span {
  color: var(--primary);
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 520px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-cta {
  display: inline-block;
  padding: 14px 36px;
  background: var(--primary);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 14px rgba(37,99,235,0.3);
}

.hero-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37,99,235,0.35);
}

.hero-stats {
  margin-top: 40px;
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  color: var(--text-light);
  font-size: 0.9rem;
}

.hero-stat {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-stat strong {
  color: var(--text);
  font-weight: 700;
}

/* ===== Cards ===== */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(37,99,235,0.2);
}

/* ===== Service Cards Grid ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.service-card {
  text-align: center;
}

.service-card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.service-card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.service-card-desc {
  font-size: 0.825rem;
  color: var(--text-light);
  line-height: 1.5;
  margin-bottom: 14px;
}

.service-card-link {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap var(--transition);
}

.service-card-link:hover {
  text-decoration: underline;
}

/* ===== Steps ===== */
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.step {
  text-align: center;
  padding: 32px 24px;
}

.step-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.step-number {
  display: inline-block;
  width: 28px;
  height: 28px;
  line-height: 28px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.step-desc {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* ===== Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.feature-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.feature-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.feature-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.feature-desc {
  font-size: 0.875rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* ===== Blog Cards ===== */
.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.blog-card-tag {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(37,99,235,0.08);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
  margin-bottom: 10px;
}

.blog-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
  line-height: 1.4;
}

.blog-card-desc {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
}

.blog-card-date {
  font-size: 0.8rem;
  color: var(--text-lighter);
  margin-top: 12px;
}

.blog-more {
  text-align: center;
  margin-top: 32px;
}

.blog-more a {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.95rem;
}

.blog-more a:hover {
  text-decoration: underline;
}

/* ===== CTA Banner ===== */
.cta-banner {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  text-align: center;
  padding: 56px 20px;
  border-radius: var(--radius);
  margin: 0 20px;
}

.cta-banner-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.cta-banner-btn {
  display: inline-block;
  padding: 14px 36px;
  background: #fff;
  color: var(--primary);
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.cta-banner-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

/* ===== Footer ===== */
.footer {
  background: #1e293b;
  color: #cbd5e1;
  padding: 48px 0 24px;
  font-size: 0.85rem;
  line-height: 1.7;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.footer-brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.footer-brand-desc {
  color: #94a3b8;
  font-size: 0.85rem;
}

.footer-col-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.footer-col a {
  display: block;
  padding: 3px 0;
  color: #94a3b8;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid #334155;
  margin-top: 32px;
  padding-top: 20px;
  text-align: center;
  color: #64748b;
  font-size: 0.8rem;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ===== Fade-in Animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

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

.btn-outline {
  display: inline-block;
  padding: 12px 28px;
  border: 1.5px solid var(--border);
  color: var(--text);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), color var(--transition);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ===== Responsive: Tablet (768px+) ===== */
@media (min-width: 768px) {
  .section { padding: 64px 0; }
  .hero { padding: 100px 0 80px; }
  .hero-title { font-size: 2.75rem; }
  .section-title { font-size: 2rem; }

  .services-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .steps { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .features-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .blog-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; }

  .cta-banner { margin: 0; }
  .cta-banner-title { font-size: 1.75rem; }
}

/* ===== Responsive: Desktop (1024px+) ===== */
@media (min-width: 1024px) {
  .section { padding: 80px 0; }
  .hero { padding: 120px 0 96px; }
  .hero-title { font-size: 3.25rem; }
  .hero-subtitle { font-size: 1.15rem; }
  .section-title { font-size: 2.25rem; }

  .services-grid { grid-template-columns: repeat(5, 1fr); }
}

/* ===== Mobile: hamburger visible ===== */
@media (max-width: 767px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
}

/* ===== Print ===== */
@media print {
  .nav, .footer, .cta-banner, .nav-mobile { display: none !important; }
  .hero { padding: 20px 0; }
  .section { padding: 20px 0; }
  body { background: #fff; }
}