/* ================================
   Reset & Base Styles
   ================================ */

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

:root {
    /* Colors */
    --primary-color: #FF6B6B;
    --primary-dark: #E85555;
    --secondary-color: #4ECDC4;
    --accent-color: #FFE66D;
    --dark-color: #2D3436;
    --gray-color: #636E72;
    --light-gray: #B2BEC3;
    --bg-light: #F8F9FA;
    --white: #FFFFFF;
    
    /* Typography */
    --font-main: 'Noto Sans KR', sans-serif;
    --font-heading: 'Poppins', 'Noto Sans KR', sans-serif;
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-padding: 0 20px;
    
    /* Transitions */
    --transition-smooth: all 0.3s ease;
    --transition-fast: all 0.2s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--dark-color);
    line-height: 1.7;
    overflow-x: hidden;
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

ul {
    list-style: none;
}

/* ================================
   Navigation
   ================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    transition: var(--transition-smooth);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.nav-logo .logo-image {
    height: 45px;
    width: auto;
    display: block;
}

.nav-logo .logo-text {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-menu li a {
    font-size: 15px;
    font-weight: 500;
    color: var(--dark-color);
    padding: 8px 16px;
    border-radius: 25px;
    transition: var(--transition-smooth);
}

.nav-menu li a:hover {
    color: var(--primary-color);
    background-color: rgba(255, 107, 107, 0.1);
}

.nav-menu li a.nav-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
    padding: 10px 25px;
}

.nav-menu li a.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

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

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--dark-color);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

/* ================================
   Hero Section
   ================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 107, 107, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(78, 205, 196, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(255, 230, 109, 0.2) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

.hero-container {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-content {
    color: var(--white);
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 56px;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 30px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero-title .highlight {
    color: var(--accent-color);
    position: relative;
    display: inline-block;
}

.hero-subtitle {
    font-size: 22px;
    font-weight: 400;
    margin-bottom: 50px;
    opacity: 0.95;
    line-height: 1.6;
}

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

.btn {
    display: inline-block;
    padding: 16px 40px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--white);
    color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

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

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary-color);
    transform: translateY(-3px);
}

.btn-block {
    width: 100%;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--white);
    font-size: 14px;
    opacity: 0.8;
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    margin: 10px auto 0;
    border-left: 2px solid var(--white);
    border-bottom: 2px solid var(--white);
    transform: rotate(-45deg);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: rotate(-45deg) translateY(0);
    }
    40% {
        transform: rotate(-45deg) translateY(-10px);
    }
    60% {
        transform: rotate(-45deg) translateY(-5px);
    }
}

/* ================================
   Section Headers
   ================================ */

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

.section-title {
    font-family: var(--font-heading);
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 20px;
    color: var(--gray-color);
    line-height: 1.6;
}

.highlight-text {
    color: var(--primary-color);
    font-weight: 600;
}

/* ================================
   About Section
   ================================ */

.about {
    padding: var(--section-padding);
    background-color: var(--bg-light);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-text {
    background: var(--white);
    padding: 50px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

.about-intro {
    font-size: 20px;
    line-height: 1.8;
    margin-bottom: 30px;
    color: var(--dark-color);
}

.about-description {
    font-size: 20px;
    line-height: 1.8;
    color: var(--gray-color);
}

.about-text strong {
    color: var(--primary-color);
    font-weight: 700;
}

/* ================================
   Vision Section
   ================================ */

.vision {
    padding: var(--section-padding);
    background: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    color: var(--white);
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 80px;
}

.vision-card {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 50px 40px;
    border-radius: 20px;
    text-align: center;
    transition: var(--transition-smooth);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.vision-card:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.25);
}

.vision-card .card-icon {
    font-size: 50px;
    margin-bottom: 20px;
}

.vision-card h3 {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
}

.vision-text {
    font-size: 22px;
    line-height: 1.6;
    font-weight: 500;
}

.core-values {
    max-width: 1000px;
    margin: 0 auto;
}

.values-title {
    font-family: var(--font-heading);
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.value-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 35px 25px;
    border-radius: 15px;
    text-align: center;
    transition: var(--transition-smooth);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.value-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.2);
}

.value-icon {
    font-size: 40px;
    margin-bottom: 15px;
}

.value-card h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}

.value-card p {
    font-size: 15px;
    line-height: 1.6;
    opacity: 0.9;
}

/* ================================
   Business Section
   ================================ */

.business {
    padding: var(--section-padding);
    background-color: var(--white);
}

.business-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
}

.business-card {
    position: relative;
    background: var(--bg-light);
    padding: 50px 35px;
    border-radius: 20px;
    transition: var(--transition-smooth);
    border: 2px solid transparent;
}

.business-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

.business-number {
    position: absolute;
    top: 20px;
    right: 30px;
    font-family: var(--font-heading);
    font-size: 60px;
    font-weight: 800;
    color: rgba(255, 107, 107, 0.1);
}

.business-icon {
    font-size: 50px;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.business-card h3 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 25px;
    color: var(--dark-color);
}

.business-card ul {
    list-style: none;
}

.business-card li {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-color);
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
}

.business-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* ================================
   Achievements Section
   ================================ */

.achievements {
    padding: var(--section-padding);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
}

.achievements .section-title {
    -webkit-text-fill-color: var(--white);
}

.achievements .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.achievements-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 50px;
}

.achievements-platforms h3,
.achievements-awards h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
}

.platform-stats,
.awards-list {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 40px;
    border-radius: 20px;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.stat-item,
.award-item {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
}

.stat-item:last-child,
.award-item:last-child {
    margin-bottom: 0;
}

.stat-icon,
.award-icon {
    font-size: 40px;
    min-width: 60px;
    text-align: center;
}

.stat-content h4,
.award-content h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 5px;
}

.stat-number {
    font-size: 22px;
    font-weight: 700;
    color: var(--accent-color);
}

.award-content p {
    font-size: 15px;
    opacity: 0.9;
}

.award-badge {
    margin-top: 30px;
    text-align: center;
}

.badge-text {
    display: inline-block;
    background: var(--accent-color);
    color: var(--dark-color);
    padding: 12px 30px;
    border-radius: 30px;
    font-size: 18px;
    font-weight: 700;
}

/* ================================
   History Section
   ================================ */

.history {
    padding: var(--section-padding);
    background-color: var(--bg-light);
}

.timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    padding: 20px 0;
}

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

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 60px;
    gap: 40px;
}

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

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

.timeline-year {
    flex: 1;
    text-align: right;
    font-family: var(--font-heading);
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.timeline-item:nth-child(even) .timeline-year {
    text-align: left;
}

.timeline-content {
    flex: 1;
    background: var(--white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.timeline-content h4 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.timeline-content p {
    font-size: 16px;
    color: var(--gray-color);
    line-height: 1.6;
}

/* ================================
   Portfolio Section
   ================================ */

.portfolio {
    padding: var(--section-padding);
    background-color: var(--white);
}

.portfolio-category {
    margin-bottom: 80px;
}

.portfolio-category:last-child {
    margin-bottom: 0;
}

.category-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 40px;
    color: var(--dark-color);
    padding-bottom: 15px;
    border-bottom: 3px solid var(--primary-color);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.portfolio-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.portfolio-list li {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px 25px;
    background: var(--bg-light);
    border-radius: 12px;
    font-size: 17px;
    font-weight: 500;
    color: var(--dark-color);
    transition: var(--transition-smooth);
    border: 2px solid transparent;
}

.portfolio-list li:hover {
    transform: translateX(10px);
    background: var(--white);
    border-color: var(--primary-color);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

.portfolio-list li i {
    font-size: 24px;
    color: var(--primary-color);
    min-width: 24px;
}

.portfolio-list li span {
    flex: 1;
}

/* ================================
   Kids Lab Section
   ================================ */

.kids-lab {
    padding: var(--section-padding);
    background: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    color: var(--white);
}

.kids-lab .section-title {
    -webkit-text-fill-color: var(--white);
}

.lab-logo {
    max-width: 500px;
    height: auto;
    margin: 0 auto 30px;
    display: block;
}

.lab-content {
    max-width: 1000px;
    margin: 0 auto;
}

.lab-description {
    text-align: center;
    margin-bottom: 60px;
}

.lab-description p {
    font-size: 22px;
    line-height: 1.8;
    margin-bottom: 30px;
}

.lab-description strong {
    color: var(--accent-color);
    font-weight: 700;
}

.lab-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 15px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 35px;
    transition: var(--transition-smooth);
}

.feature-item:hover .feature-icon {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.3);
}

.feature-item h4 {
    font-size: 18px;
    font-weight: 600;
}

/* ================================
   Future Section
   ================================ */

.future {
    padding: var(--section-padding);
    background-color: var(--bg-light);
}

.future-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 40px;
}

.future-card {
    position: relative;
    background: var(--white);
    padding: 50px 40px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    transition: var(--transition-smooth);
}

.future-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.future-icon {
    font-size: 50px;
    color: var(--primary-color);
    margin-bottom: 25px;
}

.future-card h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.future-subtitle {
    font-size: 18px;
    color: var(--secondary-color);
    margin-bottom: 25px;
    font-weight: 600;
}

.future-card ul {
    list-style: none;
}

.future-card li {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-color);
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
}

.future-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

.coming-soon {
    display: inline-block;
    background: var(--accent-color);
    color: var(--dark-color);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 700;
    margin-top: 20px;
}

/* ================================
   Contact Section
   ================================ */

.contact {
    padding: var(--section-padding);
    background-color: var(--white);
}

.contact-content-center {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-info-inline {
    margin-bottom: 40px;
}

.contact-text {
    font-size: 16px;
    color: var(--gray-color);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

.contact-text i {
    color: var(--primary-color);
    font-size: 18px;
}

.contact-button-wrapper {
    margin-top: 40px;
}

.btn-large {
    padding: 20px 60px;
    font-size: 18px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

.btn-large i {
    font-size: 20px;
}

/* ================================
   Footer
   ================================ */

.footer {
    background: var(--dark-color);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    gap: 40px;
    flex-wrap: wrap;
}

.footer-logo h3 {
    font-family: var(--font-heading);
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 5px;
}

.footer-logo p {
    font-size: 16px;
    opacity: 0.8;
}

.footer-info {
    text-align: right;
}

.footer-info p {
    font-size: 15px;
    line-height: 1.8;
    opacity: 0.9;
}

.footer-contact {
    margin-top: 10px;
}

.footer-contact i {
    margin-right: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 14px;
    opacity: 0.7;
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 1024px) {
    .achievements-content,
    .future-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        flex-direction: row !important;
        padding-left: 70px;
    }
    
    .timeline-item:nth-child(even) {
        flex-direction: row !important;
    }
    
    .timeline-year {
        position: absolute;
        left: 0;
        width: 60px;
        text-align: center !important;
        font-size: 28px;
    }
    
    .timeline-content {
        flex: 1;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-logo .logo-image {
        height: 35px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        padding: 40px 20px;
        transition: var(--transition-smooth);
        box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu li a {
        display: block;
        padding: 15px;
        text-align: center;
        font-size: 18px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .section-subtitle {
        font-size: 16px;
    }
    
    .business-grid,
    .values-grid {
        grid-template-columns: 1fr;
    }
    
    .portfolio-list {
        grid-template-columns: 1fr;
    }
    
    .contact-text {
        font-size: 14px;
        flex-direction: column;
        gap: 15px;
    }
    
    .btn-large {
        padding: 16px 40px;
        font-size: 16px;
    }
    
    .lab-features {
        gap: 30px;
    }
    
    .feature-icon {
        width: 70px;
        height: 70px;
        font-size: 30px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-info {
        text-align: center;
    }
    
    .lab-logo {
        max-width: 350px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        padding: 14px 30px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .nav-logo .logo-image {
        height: 30px;
    }
    
    .about-text {
        padding: 30px 25px;
    }
    
    .about-intro,
    .about-description {
        font-size: 16px;
    }
    
    .vision-card,
    .business-card {
        padding: 35px 25px;
    }
    
    .platform-stats,
    .awards-list {
        padding: 30px 20px;
    }
    
    .stat-item,
    .award-item {
        flex-direction: column;
        text-align: center;
    }
    
    .lab-logo {
        max-width: 280px;
    }
}

/* ================================
   Utility Classes
   ================================ */

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

.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }