/* VIKO Academy Main Page Styles */
/* Version: 4.0.0 */

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #1f2937;
    background-color: #ffffff;
    overflow-x: hidden;
    padding-top: 140px; /* 네비게이션 바 높이만큼 상단 여백 추가 */
}

/* Navigation Styles */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.5);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    min-height: 120px;
}

/* Main Navigation Menu */
.main-nav {
    width: 100%;
    padding-top: 0.75rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background: rgba(255, 255, 255, 0.1);
    color: #1f2937;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 2px solid #f97316; /* 주황색 테두리 */
    backdrop-filter: blur(10px);
}

.nav-link:hover {
    background: rgba(249, 115, 22, 0.1); /* 주황색 배경 */
    color: #f97316; /* 주황색 텍스트 */
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3); /* 주황색 그림자 */
    border-color: #f97316; /* 주황색 테두리 유지 */
}

.nav-link i {
    font-size: 1rem;
    width: 16px;
    text-align: center;
}

.nav-link.active {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%); /* 주황색 그라디언트 */
    color: white;
    border-color: #f97316; /* 주황색 테두리 */
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.4); /* 주황색 그림자 */
}

.nav-link.active:hover {
    background: linear-gradient(135deg, #ea580c 0%, #dc2626 100%); /* 더 진한 주황색 그라디언트 */
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(249, 115, 22, 0.5); /* 더 진한 주황색 그림자 */
    border-color: #ea580c; /* 더 진한 주황색 테두리 */
}

.nav-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    width: 100%;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid rgba(229, 231, 235, 0.5);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: #1f2937;
    font-weight: 700;
    font-size: 1.3rem;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.logo-icon {
    width: 35px;
    height: 35px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 1.1rem;
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.lang-btn {
    padding: 0.4rem 0.8rem;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    background: white;
    color: #6b7280;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    border-color: #667eea;
    color: #667eea;
    transform: translateY(-1px);
}

.lang-btn.active {
    background: #667eea;
    border-color: #667eea;
    color: white;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.3);
}

.auth-buttons {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.auth-btn {
    padding: 0.4rem 0.8rem;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    background: white;
    color: #6b7280;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.auth-btn:hover {
    border-color: #667eea;
    color: #667eea;
    transform: translateY(-1px);
}

.auth-btn.login {
    background: #667eea;
    border-color: #667eea;
    color: white;
}

.auth-btn.login:hover {
    background: #5a67d8;
    border-color: #5a67d8;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.3);
}

.auth-btn.logout {
    background: #ef4444;
    border-color: #ef4444;
    color: white;
}

.auth-btn.logout:hover {
    background: #dc2626;
    border-color: #dc2626;
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

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

.auth-btn.register:hover {
    background: #059669;
    border-color: #059669;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.auth-btn.admin {
    background: #8b5cf6;
    border-color: #8b5cf6;
    color: white;
}

.auth-btn.admin:hover {
    background: #7c3aed;
    border-color: #7c3aed;
    box-shadow: 0 2px 4px rgba(139, 92, 246, 0.3);
}

.welcome-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.welcome-message {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: white;
}

.welcome-message i {
    font-size: 1rem;
}

.welcome-btn {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    text-decoration: none;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.8rem;
}

.welcome-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-1px);
}

/* Hero Section */
.hero {
    min-height: 30vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    margin-top: 0;
}

/* Main Menu Section */
.main-menu-section {
    padding: 80px 0;
    background: #f8fafc;
}

.main-menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.main-menu-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.main-menu-card::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;
}

.main-menu-card:hover::before {
    left: 100%;
}

.main-menu-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: #4f46e5;
}

.menu-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    transition: all 0.3s ease;
}

.main-menu-card:hover .menu-icon {
    transform: scale(1.1);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.3);
}

.menu-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 15px;
    transition: color 0.3s ease;
}

.main-menu-card:hover .menu-title {
    color: #4f46e5;
}

.menu-description {
    color: #6b7280;
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 25px;
}

.menu-action {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: #4f46e5;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.main-menu-card:hover .menu-action {
    color: #7c3aed;
    transform: translateX(5px);
}

.menu-action i {
    transition: transform 0.3s ease;
}

.main-menu-card:hover .menu-action i {
    transform: translateX(5px);
}

.hero::before {
    content: '';
    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 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    text-align: center;
    color: white;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 600;
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: -1rem;
    opacity: 0.8;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.btn {
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
}

.btn-primary {
    background: white;
    color: #667eea;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

/* Section Common Styles */
.section {
    padding: 5rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: #1f2937;
}

.section-subtitle {
    font-size: 1.25rem;
    text-align: center;
    color: #6b7280;
    margin-bottom: 4rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Main Menu Section */
.main-menu-section {
    background: #f9fafb;
    padding: 2rem 0 4rem 0; /* 상단 패딩을 줄여서 네비게이션 바와의 간격 조정 */
}

.main-menu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.menu-item {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(229, 231, 235, 0.5);
}

.menu-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.menu-link {
    display: block;
    text-decoration: none;
    color: inherit;
    padding: 2rem;
    text-align: center;
}

.menu-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: white;
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.menu-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1f2937;
}

.menu-description {
    color: #6b7280;
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Features Section */
.features {
    background: #f9fafb;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(229, 231, 235, 0.5);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: white;
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1f2937;
}

.feature-description {
    color: #6b7280;
    line-height: 1.6;
}

/* Stats Section */
.stats {
    background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
    color: white;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
}

.stat-item {
    padding: 2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1.125rem;
    opacity: 0.8;
}

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

.course-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(229, 231, 235, 0.5);
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.course-image {
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.course-content {
    padding: 2rem;
}

.course-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1f2937;
}

.course-description {
    color: #6b7280;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.course-button {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.course-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

/* Info Section */
.info-section {
    background: #f9fafb;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.info-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid rgba(229, 231, 235, 0.5);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 20px -5px rgba(0, 0, 0, 0.1);
    border-color: #667eea;
}

.info-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.info-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.3);
}

.info-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
}

.info-description {
    color: #6b7280;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.info-list {
    list-style: none;
    padding: 0;
}

.info-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid #f3f4f6;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
}

.info-item:last-child {
    border-bottom: none;
}

.info-item:hover {
    background: rgba(102, 126, 234, 0.05);
    border-radius: 8px;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}

.info-item-icon {
    width: 24px;
    height: 24px;
    background: #e5e7eb;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6b7280;
    font-size: 0.75rem;
}

.info-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.info-link:hover {
    color: #5a67d8;
    text-decoration: underline;
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.footer-description {
    color: #9ca3af;
    margin-bottom: 2rem;
}

.footer-copyright {
    color: #6b7280;
    font-size: 0.875rem;
    border-top: 1px solid #374151;
    padding-top: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding-top: 160px; /* 모바일에서 네비게이션 바가 더 높아지므로 여백 증가 */
    }
    
    .nav-container {
        min-height: 140px;
        padding: 0.75rem;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 0.25rem;
        align-items: center;
    }
    
    .nav-link {
        width: 100%;
        max-width: 280px;
        justify-content: center;
        padding: 0.75rem 1rem;
    }
    
    /* Main Menu Mobile Styles */
    .main-menu-section {
        padding: 60px 0;
    }
    
    .main-menu-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 15px;
    }
    
    .main-menu-card {
        padding: 30px 20px;
    }
    
    .menu-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
        margin-bottom: 20px;
    }
    
    .menu-title {
        font-size: 1.5rem;
        margin-bottom: 12px;
    }
    
    .menu-description {
        font-size: 0.9rem;
        margin-bottom: 20px;
    }
    
    .menu-action {
        font-size: 0.85rem;
    }
    
    .welcome-section {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
        padding: 1rem;
    }
    
    .nav-top {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .features-grid,
    .stats-grid,
    .courses-grid,
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: 3rem 0;
    }
}

@media (max-width: 480px) {
    body {
        padding-top: 180px;
    }
    
    .nav-container {
        min-height: 160px;
        padding: 0.5rem;
    }
    
    .nav-link {
        padding: 0.6rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .nav-link span {
        display: none;
    }
    
    .nav-link i {
        font-size: 1.2rem;
    }
}

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

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

.fade-in-up-delay-1 {
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.fade-in-up-delay-2 {
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.fade-in-up-delay-3 {
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

/* Loading Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Smooth Transitions */
* {
    transition: all 0.3s ease;
}

/* Focus States */
button:focus,
a:focus,
input:focus,
textarea:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}