:root {
    --primary: #0052CC;
    --primary-dark: #003A8C;
    --primary-light: #E6F0FF;
    --accent: #00C9A7;
    --accent-dark: #00A88A;
    --dark: #1A1A2E;
    --gray-900: #212529;
    --gray-700: #495057;
    --gray-500: #6c757d;
    --gray-300: #dee2e6;
    --gray-100: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
    --radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--gray-900);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

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

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

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-900);
    transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,201,167,0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.3);
}

.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.1);
}

/* ===== Page Header (for subpages) ===== */
.page-header {
    padding: 140px 24px 60px;
    background: linear-gradient(135deg, var(--dark) 0%, #16213E 50%, var(--primary-dark) 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,201,167,0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.page-header h1 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 900;
    color: var(--white);
    margin-bottom: 12px;
    position: relative;
}

.page-header p {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.6);
    position: relative;
}

.page-header .breadcrumb {
    margin-top: 16px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
    position: relative;
}

.page-header .breadcrumb a {
    color: rgba(255,255,255,0.5);
    text-decoration: none;
}

.page-header .breadcrumb a:hover {
    color: var(--accent);
}

/* ===== Section Common ===== */
.section {
    padding: 100px 24px;
}

.section-dark {
    background: var(--gray-100);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-header p {
    font-size: 1.05rem;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Hero Section ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--dark) 0%, #16213E 50%, var(--primary-dark) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0,201,167,0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,82,204,0.2) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 24px 80px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 8px 20px;
    background: rgba(0,201,167,0.15);
    border: 1px solid rgba(0,201,167,0.3);
    border-radius: 50px;
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    font-weight: 900;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, var(--accent), #00E5FF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.7);
    max-width: 600px;
    margin-bottom: 40px;
    line-height: 1.8;
}

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

.hero-stats {
    display: flex;
    gap: 48px;
    margin-top: 64px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.stat-item h3 {
    font-size: 2rem;
    font-weight: 900;
    color: var(--accent);
}

.stat-item p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    margin-bottom: 0;
}

/* ===== About Section ===== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-content h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--gray-900);
}

.about-content p {
    color: var(--gray-700);
    margin-bottom: 16px;
    font-size: 1rem;
}

.info-list {
    list-style: none;
    margin-top: 28px;
}

.info-list li {
    display: flex;
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-300);
    font-size: 0.95rem;
}

.info-list li strong {
    min-width: 120px;
    color: var(--gray-900);
    font-weight: 600;
}

.info-list li span {
    color: var(--gray-700);
}

/* ===== Values Cards ===== */
.values-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.value-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid transparent;
}

.value-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.value-icon {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 1.5rem;
}

.value-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.value-card .en {
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.value-desc {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 10px;
    line-height: 1.6;
}

/* ===== Business Section ===== */
.business-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.business-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 4px solid transparent;
    position: relative;
    overflow: hidden;
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary-light), transparent);
    border-radius: 0 0 0 100%;
    opacity: 0;
    transition: var(--transition);
}

.business-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--primary);
}

.business-card:hover::before {
    opacity: 1;
}

.business-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 20px;
}

.business-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.business-card p {
    color: var(--gray-500);
    font-size: 0.92rem;
    margin-bottom: 16px;
}

.business-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.business-tag {
    padding: 4px 12px;
    background: var(--gray-100);
    border-radius: 50px;
    font-size: 0.78rem;
    color: var(--gray-700);
    font-weight: 500;
}

/* ===== Solutions Section ===== */
.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.solution-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.solution-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.solution-card h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 10px;
}

.solution-card p {
    font-size: 0.88rem;
    color: var(--gray-500);
    line-height: 1.7;
}

.solution-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.badge-hw { background: #FFF3E0; color: #E65100; }
.badge-sw { background: #E8F5E9; color: #2E7D32; }
.badge-platform { background: #E3F2FD; color: #1565C0; }

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 40px;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
}

.timeline-item {
    position: relative;
    margin-bottom: 32px;
    padding: 20px 28px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.timeline-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -33px;
    top: 28px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--white);
    box-shadow: 0 0 0 3px var(--primary);
}

.timeline-year {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.timeline-item h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.timeline-item p {
    font-size: 0.88rem;
    color: var(--gray-500);
}

/* ===== Vision Section ===== */
.vision-section {
    background: linear-gradient(135deg, var(--dark), var(--primary-dark));
    color: var(--white);
}

.vision-section .section-label {
    color: var(--accent);
}

.vision-section .section-header h2 {
    color: var(--white);
}

.vision-section .section-header p {
    color: rgba(255,255,255,0.6);
}

.vision-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.vision-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

.vision-card:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-4px);
}

.vision-card .step {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 12px;
}

.vision-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.vision-card p {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    line-height: 1.6;
}

/* ===== Partners Section ===== */
.partners-marquee {
    overflow: hidden;
    padding: 20px 0;
}

.partners-track {
    display: flex;
    gap: 48px;
    animation: scroll 30s linear infinite;
}

.partner-item {
    flex-shrink: 0;
    padding: 16px 32px;
    background: var(--white);
    border-radius: 8px;
    border: 1px solid var(--gray-300);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-700);
    white-space: nowrap;
    transition: var(--transition);
}

.partner-item:hover {
    border-color: var(--primary);
    color: var(--primary);
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ===== Organization ===== */
.org-chart {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.org-top {
    background: var(--primary);
    color: var(--white);
    padding: 16px 40px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1.1rem;
}

.org-line {
    width: 2px;
    height: 24px;
    background: var(--gray-300);
}

.org-branches {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.org-branch {
    background: var(--white);
    border: 2px solid var(--primary-light);
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-900);
    transition: var(--transition);
}

.org-branch:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

/* ===== Contact Section ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 0.88rem;
    color: var(--gray-500);
    line-height: 1.6;
}

.contact-form {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,82,204,0.1);
}

.form-group textarea {
    height: 120px;
    resize: vertical;
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,82,204,0.3);
}

/* ===== Footer ===== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.6);
    padding: 60px 24px 30px;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.3rem;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 16px;
}

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

.footer p {
    font-size: 0.85rem;
    line-height: 1.7;
}

.footer h4 {
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-links a {
    color: rgba(255,255,255,0.5);
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.08);
    text-align: center;
    font-size: 0.8rem;
}

/* ===== Scroll Animation ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .values-grid { grid-template-columns: repeat(3, 1fr); }
    .vision-cards { grid-template-columns: repeat(2, 1fr); }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 24px;
        box-shadow: var(--shadow);
        gap: 16px;
    }
    .mobile-toggle { display: flex; }
    .hero-stats { flex-direction: column; gap: 24px; }
    .about-grid { grid-template-columns: 1fr; gap: 32px; }
    .business-grid { grid-template-columns: 1fr; }
    .values-grid { grid-template-columns: repeat(2, 1fr); }
    .solutions-grid { grid-template-columns: 1fr; }
    .vision-cards { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; gap: 32px; }
    .hero h1 { font-size: 2rem; }
    .section { padding: 64px 24px; }
}