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

        body {
            font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
            line-height: 1.6;
            color: #333;
        }

        /* Header */
        header {
            background: white;
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        nav {
            max-width: 1400px;
            margin: 0 auto;
            padding: 1.5rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo img {
            height: 50px;
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
            align-items: center;
        }

        .nav-links a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            transition: color 0.3s;
        }

        .nav-links a:hover {
            color: #10b981;
        }

        .contact-btn {
            background: linear-gradient(135deg, #10b981 0%, #059669 100%);
            color: white !important;
            padding: 0.5rem 1rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
            transition: all 0.3s ease;
        }

        .contact-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
        }

        /* Mobile Menu Button */
        .mobile-menu-btn {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.5rem;
            z-index: 1001;
        }

        .mobile-menu-btn span {
            width: 25px;
            height: 3px;
            background: #10b981;
            border-radius: 3px;
            transition: all 0.3s ease;
        }

        .mobile-menu-btn.active span:nth-child(1) {
            transform: rotate(45deg) translate(8px, 8px);
        }

        .mobile-menu-btn.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-menu-btn.active span:nth-child(3) {
            transform: rotate(-45deg) translate(7px, -7px);
        }

        .mobile-menu-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .mobile-menu-overlay.active {
            opacity: 1;
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            right: -100%;
            width: 80%;
            max-width: 350px;
            height: 100%;
            background: white;
            box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
            z-index: 1000;
            overflow-y: auto;
            transition: right 0.3s ease;
            padding: 5rem 2rem 2rem;
        }

        .mobile-menu.active {
            right: 0;
        }

        .mobile-menu-links {
            list-style: none;
            padding: 0;
        }

        .mobile-menu-links li {
            margin-bottom: 0.5rem;
        }

        .mobile-menu-links a {
            display: block;
            padding: 1rem;
            color: #333;
            text-decoration: none;
            font-weight: 500;
            border-radius: 10px;
            transition: all 0.3s ease;
        }

        .mobile-menu-links a:hover {
            background: #f0fdf4;
            color: #10b981;
            transform: translateX(5px);
        }

        .mobile-menu-links .contact-btn {
            margin-top: 1rem;
            text-align: center;
        }

        /* Hero Section */
        .about-hero {
            background: linear-gradient(135deg, #10b981 0%, #059669 100%);
            color: white;
            padding: 6rem 2rem 4rem;
            text-align: center;
        }

        .about-hero h1 {
            font-size: 3rem;
            margin-bottom: 1rem;
        }

        .about-hero p {
            font-size: 1.3rem;
            opacity: 0.95;
        }

        /* Content Sections */
        .section {
            padding: 5rem 2rem;
        }

        .section.gray {
            background: #f9fafb;
        }

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

        .section-title {
            font-size: 2.5rem;
            text-align: center;
            margin-bottom: 1rem;
            color: #1f2937;
        }

        .section-subtitle {
            text-align: center;
            font-size: 1.2rem;
            color: #666;
            margin-bottom: 3rem;
        }

        /* Company Overview */
        .company-overview {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
            margin-bottom: 4rem;
        }

        .company-overview img {
            width: 100%;
            border-radius: 20px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
        }

        .company-info h3 {
            font-size: 2rem;
            color: #10b981;
            margin-bottom: 1.5rem;
        }

        .company-info p {
            font-size: 1.1rem;
            line-height: 1.8;
            margin-bottom: 1.5rem;
            color: #555;
        }

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

        .info-card {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            text-align: center;
        }

        .info-card h4 {
            font-size: 0.9rem;
            color: #666;
            margin-bottom: 0.5rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .info-card p {
            font-size: 1.8rem;
            color: #10b981;
            font-weight: 700;
        }

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

        .vision-card {
            background: white;
            padding: 3rem;
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }

        .vision-card .icon {
            font-size: 3rem;
            margin-bottom: 1.5rem;
        }

        .vision-card h3 {
            font-size: 1.8rem;
            color: #1f2937;
            margin-bottom: 1rem;
        }

        .vision-card p {
            font-size: 1.1rem;
            line-height: 1.8;
            color: #555;
        }

        /* Timeline */
        .timeline {
            position: relative;
            max-width: 900px;
            margin: 3rem auto;
        }

        .timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            width: 3px;
            height: 100%;
            background: linear-gradient(180deg, #10b981, #059669);
        }

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

        .timeline-item:nth-child(odd) {
            justify-content: flex-end;
            text-align: right;
        }

        .timeline-item:nth-child(odd) .timeline-content {
            margin-right: calc(50% + 2rem);
        }

        .timeline-item:nth-child(even) {
            justify-content: flex-start;
            text-align: left;
        }

        .timeline-item:nth-child(even) .timeline-content {
            margin-left: calc(50% + 2rem);
        }

        .timeline-content {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            width: calc(50% - 2rem);
        }

        .timeline-year {
            font-size: 1.8rem;
            font-weight: 700;
            color: #10b981;
            margin-bottom: 0.5rem;
        }

        .timeline-text {
            font-size: 1.1rem;
            color: #555;
            line-height: 1.6;
        }

        .timeline-dot {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 20px;
            background: #10b981;
            border-radius: 50%;
            border: 4px solid white;
            box-shadow: 0 0 0 4px #10b981;
        }

        /* Certifications */
        .cert-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            margin-top: 3rem;
        }

        .cert-card {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
            text-align: center;
            transition: transform 0.3s;
        }

        .cert-card:hover {
            transform: translateY(-5px);
        }

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

        .cert-card h4 {
            font-size: 1.1rem;
            color: #333;
            margin-bottom: 0.5rem;
        }

        .cert-card p {
            font-size: 0.9rem;
            color: #666;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #10b981 0%, #059669 100%);
            color: white;
            padding: 5rem 2rem;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }

        .cta-section p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.95;
        }

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

        .btn {
            padding: 1rem 2.5rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            transition: all 0.3s;
            display: inline-block;
        }

        .btn-white {
            background: white;
            color: #10b981;
        }

        .btn-white:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }

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

        .btn-outline:hover {
            background: white;
            color: #10b981;
        }

        /* Footer */
        footer {
            background: #1f2937;
            color: white;
            padding: 3rem 2rem 2rem;
        }

        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 2rem;
        }

        .footer-logo img {
            height: 60px;
            margin-bottom: 1rem;
        }

        .footer-about {
            opacity: 0.8;
            line-height: 1.8;
        }

        .footer-section h4 {
            font-size: 1.2rem;
            margin-bottom: 1rem;
            color: #10b981;
        }

        .footer-section ul {
            list-style: none;
        }

        .footer-section ul li {
            margin-bottom: 0.5rem;
        }

        .footer-section a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-section a:hover {
            color: #10b981;
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            text-align: center;
            opacity: 0.6;
        }

        /* Responsive */
        @media (max-width: 968px) {
            .nav-links {
                display: none;
            }

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

            .mobile-menu,
            .mobile-menu-overlay {
                display: block;
            }
        }

        @media (max-width: 768px) {
            .company-overview,
            .vision-grid {
                grid-template-columns: 1fr;
            }

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

            .timeline::before {
                left: 20px;
            }

            .timeline-item,
            .timeline-item:nth-child(odd),
            .timeline-item:nth-child(even) {
                justify-content: flex-start;
                text-align: left;
            }

            .timeline-content,
            .timeline-item:nth-child(odd) .timeline-content,
            .timeline-item:nth-child(even) .timeline-content {
                margin-left: 50px;
                margin-right: 0;
                width: calc(100% - 50px);
            }

            .timeline-dot {
                left: 20px;
            }

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