@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    
    --primary-500: #1e3a8a;
    --primary-600: #1e40af;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    --secondary-400: #3b82f6;
    --secondary-500: #2563eb;
    --secondary-600: #1d4ed8;
    
    --accent-400: #f59e0b;
    --accent-500: #d97706;
    --accent-600: #b45309;
    
    --success-400: #10b981;
    --success-500: #059669;
    --success-600: #047857;
    
    --warning-400: #f59e0b;
    --warning-500: #d97706;
    
    --error-400: #ef4444;
    --error-500: #dc2626;
    
    
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    
    --background: #ffffff;
    --surface: #f8fafc;
    --surface-elevated: #ffffff;
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-500);
    --border: var(--gray-200);
    --border-focus: var(--secondary-500);
    
    
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    
    
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.glass-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--surface-elevated, white);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    transition: var(--transition-base);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-3) var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo {
    width: 80px;
    height: 50px;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.logo-text h3 {
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--primary-600);
    margin-bottom: 0;
    line-height: 1.2;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-2);
    align-items: center;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-full);
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--text-sm);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.1), transparent);
    transition: var(--transition-slow);
}

.nav-item:hover::before {
    left: 100%;
}

.nav-item:hover,
.nav-item.active {
    color: var(--primary-600);
    background: rgba(59, 130, 246, 0.1);
    transform: translateY(-1px);
}

.profile-nav {
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    color: white !important;
    padding: var(--space-2) var(--space-3);
}

.profile-avatar {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
}

.hamburger-menu {
    display: none;
    flex-direction: column;
    gap: var(--space-1);
    cursor: pointer;
    padding: var(--space-2);
}

.bar {
    width: 20px;
    height: 3px;
    background: var(--primary-600);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.hero-enhanced {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-20) var(--space-4) var(--space-12);
    overflow: hidden;
    background: linear-gradient(135deg, 
        rgba(30, 64, 175, 0.1) 0%, 
        rgba(59, 130, 246, 0.15) 50%, 
        rgba(147, 197, 253, 0.1) 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
}

.float-element {
    position: absolute;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, 
        rgba(59, 130, 246, 0.1), 
        rgba(147, 197, 253, 0.05));
    border-radius: var(--radius-2xl);
    animation: float 20s infinite ease-in-out;
    backdrop-filter: blur(10px);
}

.float-element:nth-child(1) { animation-delay: 0s; }
.float-element:nth-child(2) { animation-delay: 4s; }
.float-element:nth-child(3) { animation-delay: 8s; }
.float-element:nth-child(4) { animation-delay: 12s; }
.float-element:nth-child(5) { animation-delay: 16s; }
.float-element:nth-child(6) { animation-delay: 20s; }

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
        opacity: 0.3;
    }
    25% {
        transform: translateY(-20px) rotate(5deg);
        opacity: 0.5;
    }
    50% {
        transform: translateY(10px) rotate(-3deg);
        opacity: 0.4;
    }
    75% {
        transform: translateY(-15px) rotate(7deg);
        opacity: 0.6;
    }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    font-size: clamp(var(--text-3xl), 5vw, var(--text-5xl));
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-500), var(--accent-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.6;
}

.hero-stats {
    display: flex;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

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

.stat-number {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--primary-600);
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.search-enhanced {
    max-width: 600px;
}

.search-wrapper {
    position: relative;
    margin-bottom: var(--space-6);
}

.search-input {
    width: 100%;
    padding: var(--space-3) var(--space-4) var(--space-3) var(--space-10);
    border: 2px solid var(--border);
    border-radius: var(--radius-2xl);
    font-size: var(--text-base);
    background: var(--surface-elevated);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
}

.search-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1), var(--shadow-xl);
}

.search-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    font-size: var(--text-base);
}

.search-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-height: 300px;
    overflow-y: auto;
    z-index: 50;
    margin-top: var(--space-2);
}

.suggestion-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    cursor: pointer;
    transition: var(--transition-fast);
}

.suggestion-item:hover {
    background: var(--gray-50);
}

.quick-filters {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.filter-chip {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border: 2px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--surface-elevated);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-base);
}

.filter-chip:hover,
.filter-chip.active {
    border-color: var(--primary-500);
    background: var(--primary-500);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.section-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-16) var(--space-4);
}

.section-header-enhanced {
    text-align: center;
    margin-bottom: var(--space-12);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-header-enhanced h2 {
    font-size: var(--text-3xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.section-header-enhanced p {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.view-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-top: var(--space-6);
}

.sort-dropdown select {
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface-elevated);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
}

.view-toggle {
    display: flex;
    background: var(--surface-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-1);
}

.view-btn {
    padding: var(--space-2) var(--space-3);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
}

.view-btn.active {
    background: var(--primary-500);
    color: white;
}

.progress-dashboard {
    background: linear-gradient(135deg, 
        rgba(59, 130, 246, 0.02), 
        rgba(147, 197, 253, 0.03));
    border-radius: var(--radius-2xl);
    margin: var(--space-8) var(--space-4);
}

.progress-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-4);
}

.progress-card-enhanced {
    background: var(--surface-elevated);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    cursor: pointer;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.progress-card-enhanced::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.05), transparent);
    transition: var(--transition-slow);
}

.progress-card-enhanced:hover::before {
    left: 100%;
}

.progress-card-enhanced:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-500);
}

.course-thumbnail-small {
    position: relative;
    width: 60px;
    height: 35px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: var(--space-3);
}

.course-thumbnail-small img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    opacity: 0;
    transition: var(--transition-base);
}

.progress-card-enhanced:hover .play-overlay {
    opacity: 1;
}

.progress-info h4 {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
    line-height: 1.3;
}

.progress-visual {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-2);
}

.progress-track {
    flex: 1;
    height: 6px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success-500), var(--success-400));
    border-radius: var(--radius-full);
    transition: var(--transition-slow);
}

.progress-text {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--success-500);
}

.course-meta-small {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.courses-container {
    display: grid;
    gap: var(--space-6);
}

.courses-container.view-grid {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

.courses-container.view-list {
    grid-template-columns: 1fr;
}

.course-card-enhanced {
    background: var(--surface-elevated);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    cursor: pointer;
    border: 1px solid var(--border);
    position: relative;
}

.course-card-enhanced:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-500);
}

.course-image {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background-color: var(--gray-100);
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.course-card-enhanced:hover .course-image img {
    transform: scale(1.05);
}

.course-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, 
        rgba(0, 0, 0, 0.1) 0%, 
        rgba(0, 0, 0, 0.3) 100%);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: var(--space-4);
    opacity: 0;
    transition: var(--transition-base);
}

.course-card-enhanced:hover .course-overlay {
    opacity: 1;
}

.course-badges {
    display: flex;
    gap: var(--space-2);
    align-self: flex-start;
}

.badge {
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-bestseller {
    background: var(--accent-500);
    color: white;
}

.badge-new {
    background: var(--success-500);
    color: white;
}

.badge-popular {
    background: var(--error-500);
    color: white;
}

.badge-advanced {
    background: var(--primary-600);
    color: white;
}

.difficulty {
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 500;
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
}

.play-btn {
    position: absolute;
    bottom: var(--space-4);
    right: var(--space-4);
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.9);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-600);
    font-size: var(--text-lg);
    cursor: pointer;
    transition: var(--transition-base);
    backdrop-filter: blur(10px);
}

.play-btn:hover {
    background: white;
    transform: scale(1.1);
}

.course-content {
    padding: var(--space-4);
}

.course-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-3);
}

.course-header h3 {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: var(--space-2);
}

.course-rating {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.stars {
    display: flex;
    gap: var(--space-1);
}

.stars i {
    color: var(--accent-500);
    font-size: var(--text-sm);
}

.course-description {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.course-stats {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.course-progress-container {
    margin-bottom: var(--space-4);
}

.progress-info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.progress-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.progress-percentage {
    font-size: var(--text-sm);
    color: var(--success-500);
    font-weight: 600;
}

.progress-bar-enhanced {
    height: 6px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.instructor {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.instructor img {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-full);
}

.instructor span {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.course-price {
    font-weight: 600;
    color: var(--primary-600);
}

.analytics-section {
    background: linear-gradient(135deg, 
        rgba(59, 130, 246, 0.02), 
        rgba(147, 197, 253, 0.03));
    border-radius: var(--radius-2xl);
    margin: var(--space-8) var(--space-4);
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4);
}

.analytics-card {
    background: var(--surface-elevated);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.analytics-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-2xl);
}

.analytics-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--text-lg);
}

.analytics-content h4 {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.analytics-value {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--primary-600);
    margin-bottom: var(--space-1);
}

.analytics-content p {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.skill-progress {
    height: 4px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--space-2);
}

.skill-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-full);
    transition: var(--transition-slow);
}

.footer-enhanced {
    background: linear-gradient(135deg, var(--gray-800), var(--gray-900));
    color: white;
    margin-top: var(--space-16);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-12) var(--space-4) var(--space-8);
}

.footer-main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-brand {
    max-width: 400px;
}

.footer-brand img {
    width: 80px;
    height: 50px;
    object-fit: contain;
    margin-bottom: var(--space-4);
}

.footer-brand h4 {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: var(--space-3);
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition-base);
}

.social-links a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-6);
}

.footer-column h5 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-3);
}

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

.footer-column li {
    margin-bottom: var(--space-2);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition-base);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer-badges {
    display: flex;
    gap: var(--space-3);
}

.footer-badges .badge {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    padding: var(--space-2) var(--space-3);
}

.logo-enhanced {
    width: 100px;
    height: 62px;
    object-fit: contain;
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

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

.course-card-enhanced-premium {
    background: var(--surface-elevated);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
    border: 1px solid var(--border);
    position: relative;
    transform-origin: center;
}

.course-card-enhanced-premium:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25), 0 0 0 1px var(--primary-500);
    border-color: var(--primary-500);
}

.course-image-premium {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
}

.course-image-premium img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.course-card-enhanced-premium:hover .course-image-premium img {
    transform: scale(1.1) rotate(1deg);
}

.course-overlay-premium {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(30, 64, 175, 0.1) 0%, 
        rgba(0, 0, 0, 0.4) 100%);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: var(--space-4);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.course-card-enhanced-premium:hover .course-overlay-premium {
    opacity: 1;
}

.premium-badge {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: linear-gradient(135deg, var(--accent-500), var(--accent-400));
    color: white;
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    width: fit-content;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.play-btn-premium {
    position: absolute;
    bottom: var(--space-4);
    right: var(--space-4);
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.95);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.play-btn-premium:hover {
    transform: scale(1.15);
    background: white;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}

.play-icon {
    color: var(--primary-600);
    font-size: var(--text-lg);
    margin-left: 2px;
    transition: var(--transition-base);
}

.play-btn-premium:hover .play-icon {
    transform: scale(1.1);
}

.course-content-premium {
    padding: var(--space-5);
}

.course-header-premium h3 {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: var(--space-3);
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.course-progress-container-premium {
    margin-bottom: var(--space-4);
    padding: var(--space-3);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(147, 197, 253, 0.05));
    border-radius: var(--radius-xl);
    border: 1px solid rgba(59, 130, 246, 0.1);
}

.progress-bar-premium {
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
}

.progress-fill-animated {
    height: 100%;
    background: linear-gradient(90deg, var(--success-500), var(--success-400), var(--primary-500));
    border-radius: var(--radius-full);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.progress-fill-animated::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.course-footer-premium {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-3);
    border-top: 1px solid var(--border);
}

.video-container-premium {
    background: var(--surface-elevated);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    margin-bottom: var(--space-6);
    border: 1px solid var(--border);
}

.video-container-premium h2 {
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--border);
    color: var(--primary-600);
    font-size: var(--text-xl);
    font-weight: 700;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.02), rgba(147, 197, 253, 0.03));
}

.video-player-premium {
    position: relative;
    padding-top: 56.25%;
    background: linear-gradient(135deg, var(--gray-900), var(--gray-800));
    overflow: hidden;
}

.custom-video-player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 0;
    outline: none;
}

.custom-video-player::-webkit-media-controls-panel {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.8), rgba(30, 64, 175, 0.3));
    border-radius: var(--radius-lg);
}

.video-overlay-controls {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    display: flex;
    align-items: flex-end;
    padding: var(--space-4);
}

.video-title-overlay {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.8), rgba(30, 64, 175, 0.6));
    color: white;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    backdrop-filter: blur(10px);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.video-player-premium:hover .video-title-overlay {
    opacity: 1;
    transform: translateY(0);
}

.video-navigation-premium {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--border);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.02), rgba(147, 197, 253, 0.03));
}

.nav-button-premium {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: linear-gradient(135deg, var(--primary-500), var(--secondary-500));
    color: white;
    border: none;
    border-radius: var(--radius-full);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--shadow-md);
}

.nav-button-premium:hover:not(:disabled) {
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-xl);
    background: linear-gradient(135deg, var(--primary-600), var(--secondary-600));
}

.nav-button-premium:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.video-progress-center {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
}

.video-counter {
    padding: var(--space-2) var(--space-4);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--primary-600);
}

.video-description-premium {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--border);
    background: var(--surface);
}

.video-description-premium h3 {
    margin-bottom: var(--space-3);
    color: var(--primary-600);
    font-size: var(--text-lg);
    font-weight: 600;
}

.video-description-premium p {
    line-height: 1.7;
    color: var(--text-secondary);
}

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }
    
    .hero-enhanced {
        padding: var(--space-16) var(--space-4) var(--space-8);
    }
    
    .section-container {
        padding: var(--space-12) var(--space-4);
    }
    
    .view-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .analytics-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
}

@media (max-width: 768px) {
    .hamburger-menu {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--surface-elevated, white);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: stretch;
        padding: var(--space-4);
        transition: var(--transition-base);
        z-index: 999;
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .nav-item {
        justify-content: center;
        padding: var(--space-4);
        border-radius: var(--radius-lg);
        margin-bottom: var(--space-2);
    }
    
    .nav-item span {
        display: block;
    }
    
    .hero-stats {
        justify-content: center;
        gap: var(--space-4);
    }
    
    .quick-filters {
        justify-content: center;
    }
    
    .courses-container.view-grid {
        grid-template-columns: 1fr;
    }
    
    .progress-grid {
        grid-template-columns: 1fr;
    }
    
    .analytics-grid {
        grid-template-columns: 1fr;
    }
    
    .analytics-card {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .logo-enhanced {
        width: 85px;
        height: 53px;
    }
    
    .course-card-enhanced-premium:hover {
        transform: translateY(-6px) scale(1.01);
    }
    
    .video-navigation-premium {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .nav-button-premium {
        width: 100%;
        justify-content: center;
    }
    
    .video-progress-center {
        order: -1;
    }
}

@media (max-width: 576px) {
    .header-container {
        padding: var(--space-2) var(--space-3);
    }
    
    .logo {
        width: 60px;
        height: 38px;
    }
    
    .logo-text h3 {
        font-size: var(--text-base);
    }
    
    .hero-enhanced {
        min-height: 80vh;
        padding: var(--space-12) var(--space-3) var(--space-6);
    }
    
    .hero-title {
        font-size: var(--text-2xl);
    }
    
    .hero-subtitle {
        font-size: var(--text-base);
    }
    
    .hero-stats {
        gap: var(--space-3);
    }
    
    .stat-number {
        font-size: var(--text-lg);
    }
    
    .section-container {
        padding: var(--space-8) var(--space-3);
    }
    
    .section-header-enhanced h2 {
        font-size: var(--text-2xl);
    }
    
    .section-header-enhanced p {
        font-size: var(--text-base);
    }
    
    .search-input {
        padding: var(--space-3) var(--space-3) var(--space-3) var(--space-8);
    }
    
    .search-icon {
        left: var(--space-2);
    }
    
    .filter-chip {
        padding: var(--space-1) var(--space-2);
        font-size: var(--text-xs);
    }
    
    .course-content {
        padding: var(--space-3);
    }
    
    .course-stats {
        flex-direction: column;
        gap: var(--space-2);
    }
    
    .footer-content {
        padding: var(--space-8) var(--space-3) var(--space-6);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-badges {
        flex-direction: column;
        text-align: center;
    }
    
    .logo-enhanced {
        width: 75px;
        height: 47px;
    }
    
    .course-content-premium {
        padding: var(--space-4);
    }
    
    .video-container-premium h2 {
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-lg);
    }
    
    .video-navigation-premium {
        padding: var(--space-3) var(--space-4);
    }
}

@media (max-width: 480px) {
    .float-element {
        width: 60px;
        height: 60px;
    }
    
    .course-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }
    
    .course-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }
    
    .progress-card-enhanced {
        padding: var(--space-3);
    }
    
    .analytics-icon {
        width: 40px;
        height: 40px;
        font-size: var(--text-base);
    }
    
    .analytics-value {
        font-size: var(--text-xl);
    }
}

main {
    padding-top: 80px;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: var(--surface-elevated, white);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    padding: var(--space-3) var(--space-4);
}

header .logo-container {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

header .logo {
    width: 80px;
    height: 50px;
    object-fit: contain;
}

footer {
    background: linear-gradient(135deg, var(--gray-800), var(--gray-900));
    color: white;
    padding: var(--space-8) var(--space-4);
    margin-top: var(--space-12);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
}

.footer-logo img {
    width: 80px;
    height: 50px;
    object-fit: contain;
    margin-bottom: var(--space-3);
}

.footer-column h4 {
    margin-bottom: var(--space-3);
    font-size: var(--text-lg);
}

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

.footer-column li {
    margin-bottom: var(--space-2);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition-base);
}

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

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

.social-icons {
    display: flex;
    justify-content: center;
    gap: var(--space-3);
    margin-top: var(--space-3);
}

.social-icons a {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition-base);
}

.social-icons a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
}

@media (max-width: 576px) {
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}