/* Google Fonts - Noto Sans KR for professional Korean typography */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700;900&display=swap');

:root {
  /* Color Palette - Trustworthy Blue & Modern Dark */
  --primary-color: #2563EB;
  /* Vibrant Blue */
  --primary-dark: #1E40AF;
  --secondary-color: #0F172A;
  /* Slate 900 */
  --accent-color: #06B6D4;
  /* Cyan */

  --text-main: #1F2937;
  --text-light: #6B7280;
  --text-white: #FFFFFF;

  --bg-white: #FFFFFF;
  --bg-light: #F9FAFB;
  --bg-dark: #111827;

  /* Spacing & Layout */
  --container-width: 1200px;
  --header-height: 80px;
  --border-radius: 12px;

  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: 'Noto Sans KR', sans-serif;
  color: var(--text-main);
  background-color: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

.section-padding {
  padding: 100px 0;
}

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

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 700;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.btn-primary {
  background: var(--primary-color);
  color: var(--text-white);
  box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.39);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.23);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--text-white);
  color: var(--text-white);
}

.btn-outline:hover {
  background: var(--text-white);
  color: var(--primary-color);
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: center;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--primary-color);
  letter-spacing: -0.5px;
}

.logo span {
  color: var(--secondary-color);
}

.nav-links {
  display: flex;
  gap: 40px;
}

.nav-links a {
  font-weight: 500;
  color: var(--text-main);
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--primary-color);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -10%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  border-radius: 50%;
  opacity: 0.1;
  filter: blur(80px);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 650px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 16px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--primary-color);
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--secondary-color);
  letter-spacing: -1px;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: 40px;
  max-width: 90%;
}

.hero-actions {
  display: flex;
  gap: 16px;
}

/* Services */
.section-header {
  margin-bottom: 60px;
}

.section-label {
  color: var(--primary-color);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.875rem;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--secondary-color);
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-light);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

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

.service-card {
  background: var(--bg-white);
  padding: 40px;
  border-radius: var(--border-radius);
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.service-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.service-icon {
  width: 64px;
  height: 64px;
  background: #EFF6FF;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--primary-color);
  margin-bottom: 24px;
  transition: var(--transition);
}

.service-card:hover .service-icon {
  background: var(--primary-color);
  color: var(--bg-white);
}

.service-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--secondary-color);
}

.service-card p {
  color: var(--text-light);
  font-size: 1rem;
  line-height: 1.6;
}

/* About Section */
.about {
  background-color: var(--bg-light);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image img {
  width: 100%;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
}

.about-content h3 {
  font-size: 2rem;
  margin-bottom: 24px;
  color: var(--secondary-color);
}

.about-content p {
  margin-bottom: 24px;
  color: var(--text-light);
  font-size: 1.05rem;
}

.stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  border-top: 1px solid #E5E7EB;
  padding-top: 40px;
}

.stat-item h4 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 4px;
}

.stat-item span {
  color: var(--text-light);
  font-weight: 500;
}

/* Contact CTA */
.cta-section {
  background: var(--secondary-color);
  color: var(--text-white);
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.cta-section .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  z-index: 10;
}

.cta-content {
  max-width: 600px;
}

.cta-title {
  font-size: 2.25rem;
  margin-bottom: 16px;
  font-weight: 800;
}

.cta-desc {
  color: #9CA3AF;
  font-size: 1.1rem;
  margin-bottom: 0;
}

/* Footer */
footer {
  background: #F8FAFC;
  padding: 60px 0 30px;
  border-top: 1px solid #E5E7EB;
}

.footer-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 16px;
  color: var(--text-light);
  max-width: 300px;
}

.footer-col h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--secondary-color);
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  color: var(--text-light);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid #E5E7EB;
  color: #9CA3AF;
  font-size: 0.875rem;
}

/* Mobile Responsive */
@media (max-width: 1024px) {
  :root {
    --container-width: 900px;
  }

  .hero h1 {
    font-size: 3rem;
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    /* Hide for now, requires JS to toggle */
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: white;
    flex-direction: column;
    padding: 20px;
    box-shadow: var(--shadow-md);
    gap: 20px;
    text-align: center;
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    height: auto;
    padding-top: 140px;
    padding-bottom: 80px;
    text-align: center;
  }

  .hero-content {
    margin: 0 auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .cta-section .container {
    flex-direction: column;
    text-align: center;
    gap: 30px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}