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

:root {
    --primary-blue: #0A4FA3;
    --accent-green: #5FAE45;
    --text-dark: #2d3748;
    --text-gray: #4a5568;
    --text-light: #718096;
    --bg-white: #ffffff;
    --bg-light: #f7fafc;
    --bg-gray: #edf2f7;
    --border-gray: #e2e8f0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    background: var(--bg-white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo-img {
    height: 50px;
    width: auto;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-blue);
}

.lang-toggle {
    background: var(--primary-blue);
    color: white;
    border: none;
    padding: 0.5rem 1.25rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: background 0.3s ease;
}

.lang-toggle:hover {
    background: #083d82;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0A4FA3 0%, #5FAE45 100%);
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    line-height: 1.8;
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-secondary {
    background: transparent;
    color: white;
    border-color: white;
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

/* Section Styles */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--bg-light);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-gray);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.subsection-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin: 3rem 0 1.5rem;
    color: var(--text-dark);
}

/* Company Section */
.company-overview {
    max-width: 900px;
    margin: 2rem auto;
    text-align: center;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-gray);
}

/* CEO Message */
.ceo-message-card {
    background: white;
    padding: 2.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-green);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    max-width: 900px;
    margin: 2rem auto;
}

.ceo-text {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--text-gray);
    font-style: italic;
    margin-bottom: 2rem;
}

.ceo-signature {
    text-align: right;
    font-weight: 600;
    color: var(--text-dark);
    padding-top: 1rem;
    border-top: 1px solid var(--border-gray);
}

/* Core Values */
.values-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.value-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.value-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.value-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.value-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 0.75rem;
}

.value-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Company History Timeline */
.timeline {
    max-width: 800px;
    margin: 2rem auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-gray);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-year {
    flex: 0 0 45%;
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-blue);
    padding: 1rem;
}

.timeline-content {
    flex: 0 0 45%;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.timeline-content h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

.timeline-item::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 2rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-green);
    border: 3px solid white;
    box-shadow: 0 0 0 3px var(--border-gray);
    transform: translateX(-50%);
}

/* Technology Grid */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.tech-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.3s ease;
}

.tech-card:hover {
    transform: translateY(-3px);
}

.tech-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tech-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.tech-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
}

/* Products Section */
.product-category {
    margin-bottom: 4rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--border-gray);
}

.product-category:last-child {
    border-bottom: none;
}

.product-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-blue);
    opacity: 0.2;
    margin-bottom: 0.5rem;
}

.product-category-title {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 2rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--primary-blue);
}

.product-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 6px;
    border-left: 3px solid var(--accent-green);
}

.feature-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.75rem;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-gray);
    line-height: 1.6;
}

/* Applications Grid */
.applications-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.application-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.3s ease;
}

.application-card:hover {
    transform: translateY(-3px);
}

.application-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.application-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.application-card p {
    color: var(--text-gray);
    font-size: 0.9rem;
}

/* Partners Grid */
.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1.5rem;
    margin: 3rem 0;
}

.partner-logo-card {
    aspect-ratio: 3/2;
    background: white;
    border: 1px solid var(--border-gray);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    transition: all 0.3s ease;
}

.partner-logo-card:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

.partner-placeholder {
    font-size: 0.75rem;
    color: var(--text-light);
    text-align: center;
    line-height: 1.4;
}

.partners-note {
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
    font-style: italic;
    margin-top: 2rem;
}

/* Network Section */
.network-diagram-container {
    margin-bottom: 4rem;
}

.network-diagram {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    margin: 2rem 0;
}

.network-diagram svg {
    width: 100%;
    height: auto;
    max-width: 900px;
    margin: 0 auto;
    display: block;
}

.network-node {
    cursor: pointer;
    transition: stroke 0.3s ease;
}

.network-node:hover {
    stroke: var(--primary-blue);
    stroke-width: 4;
}

.network-caption {
    text-align: center;
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 800px;
    margin: 1.5rem auto 0;
}

.network-partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1.5rem;
    margin: 2rem 0;
}

.network-partner-logo {
    aspect-ratio: 3/2;
    background: white;
    border: 1px solid var(--border-gray);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    transition: all 0.3s ease;
    font-size: 0.75rem;
    color: var(--text-light);
    text-align: center;
}

.network-partner-logo:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 3rem;
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-info-card {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
}

.contact-info-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.contact-info-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.contact-info-card p {
    color: var(--text-gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

.contact-info-card a {
    color: var(--primary-blue);
    text-decoration: none;
}

.contact-info-card a:hover {
    text-decoration: underline;
}

.contact-address-ko {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

/* Google Maps */
.contact-map {
    margin-top: 2rem;
}

.map-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 1rem;
}

.map-container {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.map-container iframe {
    display: block;
    width: 100%;
}

/* Contact Form */
.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-gray);
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.form-group textarea {
    resize: vertical;
}

.contact-form .btn-primary {
    width: 100%;
    cursor: pointer;
    border: none;
    background: var(--primary-blue);
    color: white;
}

.contact-form .btn-primary:hover {
    background: #083d82;
}

.form-note {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-light);
    text-align: center;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-section p {
    font-size: 0.9rem;
    line-height: 1.7;
    opacity: 0.9;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-bottom p {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .nav {
        gap: 1.5rem;
    }
    
    .values-grid,
    .tech-grid,
    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .product-features {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners-grid,
    .network-partners-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: white;
        flex-direction: column;
        padding: 2rem;
        transition: left 0.3s ease;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }
    
    .nav.active {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .values-grid,
    .tech-grid,
    .product-features,
    .applications-grid {
        grid-template-columns: 1fr;
    }
    
    .partners-grid,
    .network-partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        flex-direction: column !important;
        padding-left: 50px;
    }
    
    .timeline-year {
        text-align: left;
        padding: 0.5rem 0;
    }
    
    .timeline-item::after {
        left: 20px;
        top: 0.5rem;
    }
    
    .contact-info-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .partners-grid,
    .network-partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .logo-img {
        height: 40px;
    }
    
    .section-title {
        font-size: 2rem;
    }
}