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

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: #ffffff;
    background: linear-gradient(135deg, #1a1a2e 0%, #0d0f12 100%);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 네비게이션 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: #ffffff;
    border-bottom: 1px solid #e5e5e5;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: #000000;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #0066cc;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #0066cc;
    transition: width 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 2px;
    background: #333333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 히어로 섹션 */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.video-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.video-background video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
}

.hero-content {
    text-align: center;
    color: #fff;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    animation: fadeInUp 1s ease;
    letter-spacing: -1px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.3rem;
    font-weight: 300;
    margin-bottom: 2.5rem;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
    animation: fadeInUp 1s ease 0.2s;
    animation-fill-mode: both;
    color: #f0f0f0;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.4s;
    animation-fill-mode: both;
}

.btn {
    padding: 16px 32px;
    border: none;
    border-radius: 4px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: #0066cc;
    color: #ffffff;
}

.btn-primary:hover {
    background: #0052a3;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 102, 204, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #ffffff;
    border: 2px solid #ffffff;
}

.btn-secondary:hover {
    background: #ffffff;
    color: #0066cc;
    transform: translateY(-2px);
}

/* 섹션 공통 */
.section-title {
    text-align: center;
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: #ffffff;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: #0066cc;
}

/* 인사말 섹션 */
.greeting {
    padding: 100px 0;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0a0a0a 100%);
    color: #ffffff;
    position: relative;
    overflow: hidden;
}

.greeting::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, #0066cc, transparent);
    animation: shimmer 3s infinite;
}

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

.greeting-content {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.greeting-title {
    font-size: 3rem;
    font-weight: 700;
    color: #ffffff;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: linear-gradient(45deg, #0066cc, #00ccff, #0066cc);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 4s ease-in-out infinite;
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.greeting-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, #0066cc, #00ccff, #0066cc);
    background-size: 200% 200%;
    animation: gradient-shift 4s ease-in-out infinite;
}

.greeting-text {
    line-height: 1.8;
    color: #e0e0e0;
}

.greeting-intro {
    font-size: 1.3rem;
    font-weight: 500;
    text-align: center;
    margin-bottom: 3rem;
    color: #00ccff;
    padding: 1.5rem;
    border: 1px solid rgba(0, 204, 255, 0.3);
    border-radius: 8px;
    background: rgba(0, 102, 204, 0.1);
    backdrop-filter: blur(10px);
}

.greeting-section {
    margin-bottom: 2.5rem;
    padding: 2.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.greeting-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 102, 204, 0.1), transparent);
    transition: left 0.5s ease;
}

.greeting-section:hover::before {
    left: 100%;
}

.greeting-section:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 102, 204, 0.3);
    box-shadow: 0 10px 30px rgba(0, 102, 204, 0.2);
}

.greeting-section h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.greeting-section p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: #cccccc;
}

.section-subtitle {
    font-size: 1.1rem;
    font-weight: 600;
    color: #00ccff;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.greeting-conclusion {
    text-align: center;
    padding: 2.5rem;
    background: linear-gradient(135deg, #0066cc 0%, #00ccff 50%, #0066cc 100%);
    background-size: 200% 200%;
    border-radius: 12px;
    margin-top: 2rem;
    position: relative;
    overflow: hidden;
    animation: gradient-shift 4s ease-in-out infinite;
}

.greeting-conclusion::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.greeting-conclusion:hover::before {
    left: 100%;
}

.greeting-conclusion h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #ffffff;
    margin: 0;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.organization {
    color: #ffffff;
    position: relative;
    overflow: hidden;
}

.organization::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, #0066cc, transparent);
    animation: shimmer 3s infinite;
}

.organization-content {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.organization-title {
    font-size: 3rem;
    font-weight: 700;
    color: #ffffff;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: linear-gradient(45deg, #0066cc, #00ccff, #0066cc);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-shift 4s ease-in-out infinite;
}

.organization-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, #0066cc, #00ccff, #0066cc);
    background-size: 200% 200%;
    animation: gradient-shift 4s ease-in-out infinite;
}

.organization-chart {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 3rem;
}

.org-level {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.org-level::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 102, 204, 0.1), transparent);
    transition: left 0.5s ease;
}

.org-level:hover {
    transform: translateY(-5px);
    border-color: rgba(0, 102, 204, 0.3);
    box-shadow: 0 10px 30px rgba(0, 102, 204, 0.2);
}

.org-level:hover::before {
    left: 100%;
}

.org-departments {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.dept-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.dept-header h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #00ccff;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.5rem 1rem;
    background: rgba(0, 204, 255, 0.1);
    border-radius: 20px;
    display: inline-block;
}

.dept-structure {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.org-person {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.org-person:hover {
    transform: translateY(-3px);
    background: rgba(255, 255, 255, 0.05);
}

.person-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    color: #ffffff;
    background: linear-gradient(135deg, #0066cc, #00ccff);
    box-shadow: 0 4px 15px rgba(0, 102, 204, 0.3);
}

.person-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 0.3rem;
}

.person-info p {
    font-size: 1rem;
    color: #cccccc;
    margin-bottom: 0.2rem;
}

.person-info small {
    font-size: 0.8rem;
    color: #999999;
    font-style: italic;
}

/* 특징 섹션 */
.features {
    padding: 100px 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #0d0f12 100%);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 2.5rem 2rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 15px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
    border-color: #0066cc;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: #0066cc;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #ffffff;
    font-weight: 600;
}

.feature-card p {
    color: #cccccc;
    line-height: 1.7;
    font-size: 0.95rem;
}

/* 모델 섹션 */
.models {
    padding: 100px 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #0d0f12 100%);
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.model-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.model-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
    border-color: #0066cc;
}

.model-image {
    height: 200px;
    overflow: hidden;
}

.model-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.model-info {
    padding: 2rem;
}

.model-info h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: #ffffff;
    font-weight: 600;
}

.model-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: #0066cc;
    margin-bottom: 1.2rem;
}

.model-specs {
    list-style: none;
    margin-bottom: 1.5rem;
}

.model-specs li {
    padding: 0.6rem 0;
    color: #cccccc;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
}

.model-specs li:last-child {
    border-bottom: none;
}

/* 문의 섹션 */
.contact {
    padding: 100px 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #0d0f12 100%);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.contact-info h3 {
    font-size: 1.4rem;
    margin-bottom: 1.2rem;
    color: #ffffff;
    font-weight: 600;
}

.contact-info p {
    margin-bottom: 0.6rem;
    color: #ffffff;
    font-size: 0.95rem;
}

.social-links {
    margin-top: 1.5rem;
    display: flex;
    gap: 1rem;
}

.social-link {
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.social-link:hover {
    color: #0052a3;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
    background: rgba(255, 255, 255, 0.15);
}

/* 푸터 */
.footer {
    background: #1a1a1a;
    color: #ffffff;
    padding: 60px 0 30px;
}

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

.footer-logo h3 {
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
    color: #0066cc;
}

.footer-logo p {
    color: #cccccc;
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.footer-section h4 {
    margin-bottom: 1.2rem;
    color: #0066cc;
    font-size: 1rem;
    font-weight: 600;
}

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

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

.footer-section ul li a {
    color: #cccccc;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-section ul li a:hover {
    color: #0066cc;
}

.footer-section ul li a.active {
    color: #0066cc;
    font-weight: 600;
}

.footer-bottom {
    text-align: center;
    padding-top: 2.5rem;
    border-top: 1px solid #333333;
    color: #cccccc;
    font-size: 0.85rem;
}

/* 애니메이션 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 반응형 디자인 */
@media screen and (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: #ffffff;
        width: 100%;
        text-align: center;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        padding: 2rem 0;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu .nav-item {
        opacity: 0;
        transform: translateY(20px);
        transition: all 0.3s ease;
    }
    
    .nav-menu.active .nav-item {
        opacity: 1;
        transform: translateY(0);
    }
    
    .nav-menu.active .nav-item:nth-child(1) { transition-delay: 0.1s; }
    .nav-menu.active .nav-item:nth-child(2) { transition-delay: 0.2s; }
    .nav-menu.active .nav-item:nth-child(3) { transition-delay: 0.3s; }
    
    .hamburger.active .bar:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
    
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.1;
        margin-bottom: 1rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 2rem;
        padding: 0 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .btn {
        width: 200px;
        padding: 14px 28px;
        font-size: 0.9rem;
        transform: scale(1);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .btn:active {
        transform: scale(0.95);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .greeting {
        padding: 60px 0;
    }
    
    .greeting-title {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
    
    .greeting-intro {
        font-size: 1.1rem;
        margin-bottom: 2rem;
        padding: 0 1rem;
    }
    
    .greeting-section {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }
    
    .greeting-section h3 {
        font-size: 1.2rem;
    }
    
    .greeting-conclusion {
        padding: 1.5rem;
        margin-top: 1.5rem;
    }
    
    .greeting-conclusion h3 {
        font-size: 1.2rem;
    }
    
    .feature-card {
        padding: 2rem 1.5rem;
        transform: translateY(0);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .feature-card:hover {
        transform: translateY(-5px) scale(1.02);
    }
    
    .feature-icon {
        font-size: 2.2rem;
        margin-bottom: 1rem;
        transform: scale(1);
        transition: transform 0.3s ease;
    }
    
    .feature-card:hover .feature-icon {
        transform: scale(1.1);
    }
    
    .models-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin-top: 2rem;
    }
    
    .model-card {
        transform: translateY(0);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        overflow: hidden;
    }
    
    .model-card:hover {
        transform: translateY(-8px) scale(1.02);
    }
    
    .model-image {
        height: 180px;
        transition: transform 0.3s ease;
    }
    
    .model-card:hover .model-image {
        transform: scale(1.05);
    }
    
    .contact-form input,
    .contact-form textarea {
        padding: 14px;
        font-size: 0.9rem;
        transform: scale(1);
        transition: all 0.3s ease;
    }
    
    .contact-form input:focus,
    .contact-form textarea:focus {
        transform: scale(1.02);
        box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.15);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media screen and (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
        line-height: 1.1;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        padding: 0 0.5rem;
    }
    
    .features-grid,
    .models-grid {
        grid-template-columns: 1fr;
        gap: 1.2rem;
    }
    
    .nav-container {
        padding: 0 15px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .feature-card {
        padding: 1.5rem 1rem;
    }
    
    .model-card:hover .model-image {
        transform: scale(1.03);
    }
    
    .btn {
        width: 180px;
        padding: 12px 24px;
        font-size: 0.85rem;
    }
    
    .section-title {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }
    
    /* 터치 디바이스 최적화 */
    @media (hover: none) and (pointer: coarse) {
        .feature-card:hover,
        .model-card:hover {
            transform: none;
        }
        
        .feature-card:active,
        .model-card:active {
            transform: scale(0.98);
        }
    }
}