/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

/* ===== COLORS ===== */
:root {
    --primary-color: #4285f4;
    --primary-light: #6fa7ff;
    --primary-dark: #1557b0;
    --secondary-color: #34a853;
    --accent-color: #fbbc04;
    --warning-color: #ea4335;
    --text-dark: #333333;
    --text-medium: #666666;
    --text-light: #999999;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-light: #e9ecef;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --gradient-primary: linear-gradient(135deg, #4285f4, #34a853);
    --gradient-light: linear-gradient(135deg, #f8f9fa, #ffffff);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--primary-dark);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-light);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    color: white;
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* ===== SECTIONS ===== */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    color: var(--text-dark);
    margin-bottom: 15px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

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

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

.navbar {
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand .logo {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0;
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: var(--text-dark);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background: var(--bg-light);
    color: var(--primary-color);
}

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

.hamburger .bar {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* ===== HERO SECTION ===== */
.hero {
    padding: 150px 0 100px;
    background: var(--gradient-light);
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--text-medium);
    margin-bottom: 50px;
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-bottom: 50px;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    color: var(--text-medium);
    font-size: 1rem;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* ===== ABOUT SECTION ===== */
.about {
    background: var(--bg-white);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.about-card {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    text-align: center;
    transition: transform 0.3s ease;
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.about-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: white;
}

.about-card h3 {
    color: var(--text-dark);
    margin-bottom: 25px;
}

.about-details {
    text-align: left;
}

.detail-item {
    display: flex;
    margin-bottom: 15px;
    align-items: flex-start;
}

.detail-label {
    font-weight: 600;
    color: var(--text-dark);
    min-width: 100px;
    margin-right: 10px;
}

.detail-value {
    color: var(--text-medium);
    flex: 1;
}

.vision-mission {
    text-align: left;
}

.vm-item {
    margin-bottom: 25px;
}

.vm-item h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.vm-item p {
    color: var(--text-medium);
    margin-bottom: 0;
}

.values {
    text-align: left;
}

.value-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 20px;
}

.value-icon {
    font-size: 1.5rem;
    margin-right: 15px;
    margin-top: 5px;
}

.value-item h4 {
    color: var(--text-dark);
    margin-bottom: 5px;
}

.value-item p {
    color: var(--text-medium);
    margin-bottom: 0;
}

/* ===== HISTORY SECTION ===== */
.history {
    background: var(--bg-light);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 50px;
    position: relative;
}

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

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

.timeline-marker {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.timeline-year {
    background: var(--gradient-primary);
    color: white;
    padding: 10px 20px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: var(--shadow-light);
}

.timeline-content {
    flex: 1;
    background: var(--bg-white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
    margin: 0 60px;
    max-width: 350px;
}

.timeline-item:nth-child(odd) .timeline-content {
    margin-right: 60px;
    margin-left: 0;
}

.timeline-item:nth-child(even) .timeline-content {
    margin-left: 60px;
    margin-right: 0;
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.timeline-content p {
    color: var(--text-medium);
    margin-bottom: 0;
}

/* ===== BUSINESS SECTION ===== */
.business {
    background: var(--bg-white);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.business-card {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    text-align: center;
    transition: transform 0.3s ease;
    border: 1px solid var(--border-light);
}

.business-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.business-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2rem;
    color: white;
}

.business-card h3 {
    color: var(--text-dark);
    margin-bottom: 20px;
}

.business-card p {
    color: var(--text-medium);
    margin-bottom: 25px;
    line-height: 1.6;
}

.feature-list {
    list-style: none;
    text-align: left;
}

.feature-list li {
    color: var(--text-medium);
    padding: 8px 0;
    position: relative;
    padding-left: 25px;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

/* ===== TECHNOLOGY SECTION ===== */
.technology {
    background: var(--bg-light);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.tech-card {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    text-align: center;
}

.tech-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2rem;
    color: white;
}

.tech-card h3 {
    color: var(--text-dark);
    margin-bottom: 25px;
}

.tech-item {
    text-align: left;
    margin-bottom: 20px;
    padding: 15px;
    background: var(--bg-light);
    border-radius: 10px;
}

.tech-item h4 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.tech-item p {
    color: var(--text-medium);
    margin-bottom: 0;
}

.cert-list, .award-list {
    text-align: left;
}

.cert-item, .award-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 20px;
    padding: 15px;
    background: var(--bg-light);
    border-radius: 10px;
}

.cert-badge {
    width: 50px;
    height: 50px;
    background: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 15px;
    color: white;
    font-size: 1.2rem;
}

.award-year {
    background: var(--accent-color);
    color: white;
    padding: 5px 15px;
    border-radius: 15px;
    font-weight: 600;
    margin-right: 15px;
    min-width: 60px;
    text-align: center;
}

.award-info h4 {
    color: var(--text-dark);
    margin-bottom: 5px;
}

.award-info p {
    color: var(--text-medium);
    margin-bottom: 0;
}

/* ===== PARTNERS SECTION ===== */
.partners {
    background: var(--bg-white);
}

.partners-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.clients-section h3,
.partners-section h3 {
    color: var(--text-dark);
    margin-bottom: 30px;
    text-align: center;
}

.client-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.client-card {
    background: var(--bg-light);
    padding: 30px 20px;
    border-radius: 15px;
    text-align: center;
    font-weight: 600;
    color: var(--text-dark);
    transition: all 0.3s ease;
}

.client-card:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-5px);
}

.partner-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.partner-card {
    background: var(--bg-light);
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
}

.partner-card:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow-light);
    transform: translateY(-5px);
}

.partner-logo {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.partner-card h4 {
    color: var(--text-dark);
    margin-bottom: 10px;
}

.partner-card p {
    color: var(--text-medium);
    margin-bottom: 0;
    font-size: 0.9rem;
}

/* ===== CONTACT SECTION ===== */
.contact {
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    background: var(--bg-white);
    padding: 25px;
    border-radius: 15px;
    box-shadow: var(--shadow-light);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    color: white;
    font-size: 1.2rem;
}

.contact-details h4 {
    color: var(--text-dark);
    margin-bottom: 5px;
}

.contact-details p {
    color: var(--text-medium);
    margin-bottom: 0;
    line-height: 1.5;
}

.contact-form {
    background: var(--bg-white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
}

.form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    color: var(--text-dark);
    font-weight: 500;
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    padding: 15px;
    border: 2px solid var(--border-light);
    border-radius: 10px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

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

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

/* ===== FOOTER ===== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    color: white;
}

.footer-section h3 {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-section p {
    color: #cccccc;
    line-height: 1.6;
}

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

.footer-section ul li {
    color: #cccccc;
    padding: 5px 0;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #555;
    color: #999;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-medium);
        padding: 20px 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .about-grid,
    .business-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-marker {
        left: 20px;
        transform: translateX(-50%);
    }
    
    .timeline-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .timeline-content {
        margin-left: 60px;
        margin-right: 0;
        max-width: none;
    }
    
    .partners-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .client-grid {
        grid-template-columns: 1fr;
    }
    
    section {
        padding: 60px 0;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .about-card,
    .business-card,
    .tech-card {
        padding: 30px 20px;
    }
    
    .contact-form {
        padding: 30px 20px;
    }
    
    .timeline-content {
        margin-left: 40px;
        padding: 20px;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* ===== UTILITY CLASSES ===== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }