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

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo i {
    font-size: 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

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

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s;
    padding: 0.5rem 0;
}

.nav-link:hover,
.nav-link.active {
    opacity: 0.8;
    border-bottom: 2px solid white;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-left: 1rem;
}

.lang-btn {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.4rem 0.8rem;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.lang-btn.active {
    background: white;
    color: #11998e;
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    background: rgba(17, 153, 142, 0.98);
    padding: 2rem;
    transition: left 0.3s;
    z-index: 999;
}

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

.mobile-nav-link {
    display: block;
    color: white;
    text-decoration: none;
    padding: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.2);
    font-weight: 500;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    padding: 150px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 120"><path d="M0,0 Q300,50 600,30 T1200,20 L1200,120 L0,120 Z" fill="rgba(255,255,255,0.05)"/></svg>') repeat-x bottom;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    animation: fadeInUp 1s;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    animation: fadeInUp 1s 0.2s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-bottom: 3rem;
    animation: fadeInUp 1s 0.4s both;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    animation: fadeInUp 1s 0.6s both;
}

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

.btn-primary {
    background: white;
    color: #11998e;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background: white;
    color: #11998e;
}

.btn-course {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
    width: 100%;
    text-align: center;
}

.btn-course:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(17, 153, 142, 0.3);
}

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.1rem;
}

/* Section Styles */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #2d3748;
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: #718096;
    margin-bottom: 3rem;
}

/* Introduction */
.intro {
    background: white;
}

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

.intro-card {
    text-align: center;
    padding: 2rem;
    border-radius: 15px;
    background: #f8f9fa;
    transition: all 0.3s;
}

.intro-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.intro-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.intro-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.intro-card p {
    color: #718096;
    line-height: 1.8;
}

/* Content Areas */
.content-areas {
    background: #f8f9fa;
}

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

.content-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.content-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.content-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #2d3748;
}

.content-info {
    color: #11998e;
    font-weight: 600;
    margin-bottom: 1rem;
}

.content-list {
    list-style: none;
    margin-top: 1rem;
}

.content-list li {
    padding: 0.5rem 0;
    color: #718096;
    border-bottom: 1px solid #e2e8f0;
}

.content-list li:last-child {
    border-bottom: none;
}

/* Courses Section */
.courses {
    background: white;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
}

.course-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    transition: all 0.3s;
    position: relative;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 50px rgba(0,0,0,0.15);
}

.course-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    color: white;
}

.course-badge.beginner {
    background: linear-gradient(135deg, #06beb6 0%, #48b1bf 100%);
}

.course-badge.intermediate {
    background: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%);
}

.course-badge.advanced {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.course-title {
    font-size: 2rem;
    color: #2d3748;
    margin-bottom: 0.5rem;
}

.course-subtitle {
    color: #718096;
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.course-info {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.5rem 0;
    color: #4a5568;
}

.info-item i {
    color: #11998e;
    font-size: 1.2rem;
}

.course-content h4 {
    font-size: 1.3rem;
    color: #2d3748;
    margin-bottom: 1rem;
}

.course-content ul {
    list-style: none;
    margin-bottom: 2rem;
}

.course-content li {
    padding: 0.8rem 0;
    border-bottom: 1px solid #e2e8f0;
    color: #4a5568;
}

.course-content li i {
    color: #48bb78;
    margin-right: 0.8rem;
}

/* Curriculum Link */
.curriculum-link {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
}

.curriculum-box {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255,255,255,0.1);
    border-radius: 20px;
    padding: 3rem;
    backdrop-filter: blur(10px);
}

.curriculum-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.curriculum-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.curriculum-icon i {
    font-size: 8rem;
    opacity: 0.3;
}

/* Business Section */
.business-section {
    background: #f8f9fa;
}

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

.business-card {
    background: white;
    padding: 2.5rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s;
}

.business-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.business-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.business-card h3 {
    font-size: 1.5rem;
    color: #2d3748;
    margin-bottom: 1rem;
}

.business-card p {
    color: #718096;
    line-height: 1.8;
}

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

/* Contact Section */
.contact {
    background: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-card {
    background: #f8f9fa;
    padding: 3rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.contact-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 2rem;
}

.contact-card h3 {
    font-size: 1.5rem;
    color: #2d3748;
    margin-bottom: 1rem;
}

.contact-card a {
    color: #11998e;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 600;
}

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

/* Footer */
.footer {
    background: #2d3748;
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-info p {
    color: #cbd5e0;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.footer-links a {
    display: block;
    color: #cbd5e0;
    text-decoration: none;
    padding: 0.3rem 0;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

.footer-contact p {
    color: #cbd5e0;
    padding: 0.3rem 0;
}

.footer-contact i {
    margin-right: 0.5rem;
    color: #11998e;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #4a5568;
    color: #cbd5e0;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .curriculum-box {
        flex-direction: column;
        text-align: center;
    }
    
    .curriculum-icon i {
        font-size: 5rem;
        margin-top: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
    }
}