:root {
            /* Light Mode - macOS inspired */
            --bg-primary: #ffffff;
            --bg-secondary: #f5f5f7;
            --bg-tertiary: #e8e8ed;
            --text-primary: #1d1d1f;
            --text-secondary: #6e6e73;
            --text-tertiary: #86868b;
            
            /* Neon Accent Colors */
            --neon-blue: #0071e3;
            --neon-purple: #bf5af2;
            --neon-pink: #ff2d55;
            --neon-green: #30d158;
            --neon-orange: #ff9500;
            --neon-cyan: #64d2ff;
            
            /* Glassmorphism */
            --glass-bg: rgba(255, 255, 255, 0.7);
            --glass-border: rgba(255, 255, 255, 0.3);
            --glass-shadow: rgba(0, 0, 0, 0.1);
            
            /* Shadows */
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
            
            /* Gradients */
            --gradient-neon: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
            --gradient-warm: linear-gradient(135deg, var(--neon-orange), var(--neon-pink));
            --gradient-cool: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
        }

        [data-theme="dark"] {
            --bg-primary: #000000;
            --bg-secondary: #1c1c1e;
            --bg-tertiary: #2c2c2e;
            --text-primary: #f5f5f7;
            --text-secondary: #a1a1a6;
            --text-tertiary: #6e6e73;
            
            --glass-bg: rgba(28, 28, 30, 0.7);
            --glass-border: rgba(255, 255, 255, 0.1);
            --glass-shadow: rgba(0, 0, 0, 0.3);
            
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
            --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
            /* Remove slow transition - instant theme switching */
        }

        /* Add will-change for elements that animate */
        .navbar-wrapper,
        .instructor-card,
        .testimonial-card,
        .course-card,
        .feature-card,
        .category-card {
            will-change: transform;
        }

        /* GPU acceleration for smooth animations */
        .floating-card,
        .hero-gradient,
        .particle {
            will-change: transform;
            transform: translateZ(0);
            backface-visibility: hidden;
        }

        /* Instant color transitions */
        * {
            transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
        }

        /* Floating Particles Background */
        .particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
            overflow: hidden;
        }

        .particle {
            position: absolute;
            border-radius: 50%;
            animation: float 20s infinite ease-in-out;
            opacity: 0.1;
        }

        @keyframes float {
            0%, 100% { transform: translate(0, 0) rotate(0deg); }
            33% { transform: translate(30px, -30px) rotate(120deg); }
            66% { transform: translate(-20px, 20px) rotate(240deg); }
        }

        /* Navigation */
        .navbar-wrapper {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            padding: 20px 0;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .navbar-wrapper.scrolled {
            padding: 12px 0;
            background: var(--glass-bg);
            backdrop-filter: blur(20px) saturate(180%);
            -webkit-backdrop-filter: blur(20px) saturate(180%);
            border-bottom: 1px solid var(--glass-border);
            box-shadow: var(--shadow-sm);
        }

        .navbar {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
        }

        .logo {
            font-size: 28px;
            font-weight: 700;
            background: var(--gradient-neon);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
            letter-spacing: -1px;
            transition: transform 0.3s ease;
        }

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

        .nav-links {
            display: flex;
            list-style: none;
            gap: 32px;
            align-items: center;
        }

        .nav-links a {
            color: var(--text-primary);
            text-decoration: none;
            font-weight: 500;
            font-size: 15px;
            position: relative;
            transition: color 0.3s ease;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient-neon);
            transition: width 0.3s ease;
        }

        .nav-links a:hover {
            color: var(--neon-blue);
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        .auth-buttons {
            display: flex;
            gap: 12px;
            align-items: center;
        }

        .btn {
            padding: 10px 24px;
            border-radius: 980px;
            text-decoration: none;
            font-weight: 600;
            font-size: 14px;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: inline-block;
            border: none;
            cursor: pointer;
        }

        .btn-primary {
            background: var(--gradient-neon);
            color: white;
            box-shadow: 0 4px 16px rgba(0, 113, 227, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 113, 227, 0.4);
        }

        .btn-secondary {
            background: var(--bg-secondary);
            color: var(--text-primary);
        }

        .btn-secondary:hover {
            background: var(--bg-tertiary);
            transform: translateY(-2px);
        }

        .theme-toggle {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--bg-secondary);
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-primary);
            font-size: 18px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-sm);
        }

        .theme-toggle:hover {
            transform: rotate(180deg) scale(1.1);
            box-shadow: var(--shadow-md);
        }

        /* Hero Section - Completely Redesigned */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 140px 40px 80px;
            overflow: hidden;
        }

        .hero-background {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
            overflow: hidden;
        }

        .hero-gradient {
            position: absolute;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            filter: blur(100px);
            opacity: 0.3;
            animation: heroFloat 20s infinite ease-in-out;
        }

        .hero-gradient-1 {
            background: var(--neon-blue);
            top: -200px;
            right: -100px;
        }

        .hero-gradient-2 {
            background: var(--neon-purple);
            bottom: -200px;
            left: -100px;
            animation-delay: -10s;
        }

        @keyframes heroFloat {
            0%, 100% { transform: translate(0, 0) scale(1); }
            50% { transform: translate(50px, 50px) scale(1.1); }
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 1400px;
            width: 100%;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 80px;
            align-items: center;
        }

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

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 20px;
            background: var(--glass-bg);
            backdrop-filter: blur(10px);
            border-radius: 100px;
            border: 1px solid var(--glass-border);
            font-size: 13px;
            font-weight: 600;
            color: var(--neon-purple);
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
        }

        .hero-badge i {
            font-size: 10px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(0.8); }
        }

        .hero h1 {
            font-size: 64px;
            font-weight: 700;
            line-height: 1.1;
            margin-bottom: 24px;
            letter-spacing: -2px;
        }

        .hero h1 .gradient-text {
            background: var(--gradient-neon);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-description {
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 40px;
            line-height: 1.6;
        }

        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .hero-buttons .btn {
            padding: 14px 32px;
            font-size: 16px;
        }

        .hero-visual {
            position: relative;
            height: 600px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .floating-card {
            position: absolute;
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            border-radius: 24px;
            padding: 24px;
            border: 1px solid var(--glass-border);
            box-shadow: var(--shadow-xl);
            animation: floatCard 6s infinite ease-in-out;
        }

        @keyframes floatCard {
            0%, 100% { transform: translateY(0) rotate(0deg); }
            50% { transform: translateY(-20px) rotate(2deg); }
        }

        .floating-card-1 {
            top: 50px;
            left: 0;
            width: 280px;
            animation-delay: 0s;
        }

        .floating-card-2 {
            top: 200px;
            right: 0;
            width: 240px;
            animation-delay: -2s;
        }

        .floating-card-3 {
            bottom: 100px;
            left: 60px;
            width: 260px;
            animation-delay: -4s;
        }

        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 12px;
            font-size: 24px;
        }

        .card-icon-1 { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
        .card-icon-2 { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
        .card-icon-3 { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }

        .floating-card h4 {
            font-size: 16px;
            margin-bottom: 8px;
            font-weight: 600;
        }

        .floating-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        .floating-card .card-stats {
            display: flex;
            gap: 16px;
            margin-top: 16px;
            padding-top: 16px;
            border-top: 1px solid var(--glass-border);
        }

        .card-stat {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            color: var(--text-secondary);
        }

        .card-stat i {
            color: var(--neon-blue);
        }

        /* Instructors Section - New Carousel Design */
        .instructors-section {
            position: relative;
            padding: 120px 40px;
            background: var(--bg-secondary);
            overflow: hidden;
        }

        .section-header {
            max-width: 1400px;
            margin: 0 auto 60px;
            text-align: center;
        }

        .section-label {
            display: inline-block;
            padding: 8px 20px;
            background: var(--glass-bg);
            backdrop-filter: blur(10px);
            border-radius: 100px;
            border: 1px solid var(--glass-border);
            font-size: 13px;
            font-weight: 600;
            color: var(--neon-purple);
            margin-bottom: 16px;
        }

        .section-header h2 {
            font-size: 48px;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: -1px;
        }

        .section-header p {
            font-size: 18px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        .instructors-carousel {
            position: relative;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 60px;
        }

        .instructors-track {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            scroll-behavior: smooth;
            scrollbar-width: none;
            -ms-overflow-style: none;
            padding: 20px 0;
            scroll-snap-type: x mandatory;
        }

        .instructors-track::-webkit-scrollbar {
            display: none;
        }

        .instructor-card {
            min-width: 320px;
            flex-shrink: 0;
            background: var(--bg-primary);
            border-radius: 24px;
            padding: 32px;
            border: 1px solid var(--glass-border);
            box-shadow: var(--shadow-md);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            scroll-snap-align: start;
            contain: layout style paint;
            transform: translateZ(0);
        }

        .instructor-card:hover {
            transform: translateY(-8px) translateZ(0);
            box-shadow: var(--shadow-xl);
        }

        .instructor-avatar {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            margin: 0 auto 20px;
            position: relative;
            overflow: hidden;
        }

        .instructor-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .instructor-avatar::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 50%;
            padding: 3px;
            background: var(--gradient-neon);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .instructor-card:hover .instructor-avatar::after {
            opacity: 1;
        }

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

        .instructor-info h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .instructor-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            margin-top: 16px;
            padding-top: 16px;
            border-top: 1px solid var(--glass-border);
            font-size: 14px;
            color: var(--text-secondary);
        }

        .instructor-meta span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .instructor-meta i {
            color: var(--neon-blue);
        }

        .carousel-nav {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--bg-primary);
            border: 1px solid var(--glass-border);
            box-shadow: var(--shadow-md);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            z-index: 10;
        }

        .carousel-nav:hover {
            background: var(--neon-blue);
            color: white;
            transform: translateY(-50%) scale(1.1);
        }

        .carousel-nav.prev { left: 0; }
        .carousel-nav.next { right: 0; }

        /* Categories - New Design */
        .categories-section {
            padding: 100px 40px;
            background: var(--bg-primary);
            content-visibility: auto;
            contain-intrinsic-size: auto 500px;
        }

        .categories-grid {
            max-width: 1400px;
            margin: 60px auto 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 20px;
        }

        .category-card {
            background: var(--bg-secondary);
            border-radius: 20px;
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--glass-border);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
        }

        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            background: var(--bg-primary);
        }

        .category-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 16px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: white;
            transition: transform 0.3s ease;
        }

        .category-card:hover .category-icon {
            transform: scale(1.1) rotate(5deg);
        }

        .category-card:nth-child(1) .category-icon { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
        .category-card:nth-child(2) .category-icon { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
        .category-card:nth-child(3) .category-icon { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
        .category-card:nth-child(4) .category-icon { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
        .category-card:nth-child(5) .category-icon { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
        .category-card:nth-child(6) .category-icon { background: linear-gradient(135deg, #30cfd0 0%, #330867 100%); }

        .category-card h3 {
            font-size: 16px;
            font-weight: 600;
        }

        /* Features - New Grid Layout */
        .features-section {
            padding: 120px 40px;
            background: var(--bg-secondary);
            position: relative;
            overflow: hidden;
            content-visibility: auto;
            contain-intrinsic-size: auto 800px;
        }

        .features-grid {
            max-width: 1400px;
            margin: 60px auto 0;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 32px;
        }

        .feature-card {
            background: var(--bg-primary);
            border-radius: 24px;
            padding: 40px;
            border: 1px solid var(--glass-border);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-xl);
        }

        .feature-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin-bottom: 24px;
            background: var(--gradient-neon);
            color: white;
        }

        .feature-card h3 {
            font-size: 22px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .feature-card p {
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Courses - New Masonry Layout */
        .courses-section {
            padding: 120px 40px;
            background: var(--bg-primary);
            content-visibility: auto;
            contain-intrinsic-size: auto 900px;
        }

        .courses-grid {
            max-width: 1400px;
            margin: 60px auto 0;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
            gap: 32px;
        }

        .course-card {
            background: var(--bg-secondary);
            border-radius: 24px;
            overflow: hidden;
            border: 1px solid var(--glass-border);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            contain: layout style paint;
            transform: translateZ(0);
        }

        .course-card:hover {
            transform: translateY(-8px) translateZ(0);
            box-shadow: var(--shadow-xl);
        }

        .course-image {
            position: relative;
            width: 100%;
            height: 240px;
            overflow: hidden;
        }

        .course-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }

        .course-card:hover .course-image img {
            transform: scale(1.1);
        }

        .course-badge {
            position: absolute;
            top: 16px;
            left: 16px;
            padding: 6px 16px;
            background: var(--glass-bg);
            backdrop-filter: blur(10px);
            border-radius: 100px;
            border: 1px solid var(--glass-border);
            font-size: 12px;
            font-weight: 600;
            color: var(--neon-purple);
        }

        .course-content {
            padding: 24px;
        }

        .course-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 12px;
            font-size: 13px;
        }

        .course-category {
            color: var(--neon-blue);
            font-weight: 600;
        }

        .course-grade {
            color: var(--text-tertiary);
        }

        .course-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
            color: var(--text-primary);
        }

        .course-instructor {
            color: var(--text-secondary);
            font-size: 14px;
            margin-bottom: 16px;
        }

        .course-info {
            display: flex;
            align-items: center;
            gap: 20px;
            padding-top: 16px;
            border-top: 1px solid var(--glass-border);
            font-size: 13px;
            color: var(--text-secondary);
        }

        .course-info span {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .course-info i {
            color: var(--neon-blue);
        }

        /* Testimonials - New Card Slider */
        .testimonials-section {
            padding: 120px 40px;
            background: var(--bg-secondary);
            overflow: hidden;
            content-visibility: auto;
            contain-intrinsic-size: auto 600px;
        }

        .testimonials-slider {
            max-width: 1400px;
            margin: 60px auto 0;
            position: relative;
        }

        .testimonials-track {
            display: flex;
            gap: 32px;
            overflow-x: auto;
            scroll-behavior: smooth;
            scrollbar-width: none;
            padding: 20px 0;
            scroll-snap-type: x mandatory;
        }

        .testimonials-track::-webkit-scrollbar {
            display: none;
        }

        .testimonial-card {
            min-width: 480px;
            flex-shrink: 0;
            background: var(--bg-primary);
            border-radius: 24px;
            padding: 32px;
            border: 1px solid var(--glass-border);
            box-shadow: var(--shadow-md);
            display: flex;
            flex-direction: column;
            gap: 24px;
            scroll-snap-align: start;
            contain: layout style paint;
            transform: translateZ(0);
        }

        .testimonial-header {
            display: flex;
            gap: 16px;
            align-items: center;
        }

        .testimonial-avatar {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            overflow: hidden;
            flex-shrink: 0;
        }

        .testimonial-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .testimonial-author h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .testimonial-author p {
            font-size: 13px;
            color: var(--text-secondary);
        }

        .testimonial-stars {
            display: flex;
            gap: 4px;
            font-size: 16px;
            color: var(--neon-orange);
        }

        .testimonial-quote {
            color: var(--text-secondary);
            line-height: 1.7;
            font-size: 15px;
        }

        .testimonial-course {
            display: flex;
            align-items: center;
            gap: 12px;
            padding-top: 16px;
            border-top: 1px solid var(--glass-border);
        }

        .testimonial-course-img {
            width: 48px;
            height: 48px;
            border-radius: 8px;
            overflow: hidden;
            flex-shrink: 0;
        }

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

        .testimonial-course-info h5 {
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .testimonial-course-info p {
            font-size: 12px;
            color: var(--text-tertiary);
        }

        /* Stats */
        .stats-section {
            padding: 100px 40px;
            background: var(--bg-primary);
        }

        .stats-grid {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }

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

        .stat-number {
            font-size: 56px;
            font-weight: 700;
            background: var(--gradient-neon);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 12px;
        }

        .stat-label {
            font-size: 18px;
            color: var(--text-secondary);
        }

        /* Footer */
        footer {
            background: var(--bg-secondary);
            padding: 80px 40px 40px;
        }

        .footer-content {
            max-width: 1400px;
            margin: 0 auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 60px;
            margin-bottom: 60px;
        }

        .footer-brand h3 {
            font-size: 28px;
            font-weight: 700;
            background: var(--gradient-neon);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 16px;
        }

        .footer-brand p {
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 24px;
        }

        .social-links {
            display: flex;
            gap: 12px;
        }

        .social-links a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg-tertiary);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-primary);
            transition: all 0.3s ease;
        }

        .social-links a:hover {
            background: var(--neon-blue);
            color: white;
            transform: translateY(-4px);
        }

        .footer-column h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 12px;
        }

        .footer-links a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color 0.3s ease;
            font-size: 14px;
        }

        .footer-links a:hover {
            color: var(--neon-blue);
        }

        .footer-bottom {
            padding-top: 32px;
            border-top: 1px solid var(--glass-border);
            text-align: center;
            color: var(--text-secondary);
            font-size: 14px;
        }

        .footer-bottom a {
            color: var(--neon-blue);
            text-decoration: none;
            font-weight: 600;
        }

        /* Responsive Design */
        @media (max-width: 1200px) {
            .hero-content {
                grid-template-columns: 1fr;
                gap: 60px;
            }

            .hero-visual {
                height: 500px;
            }

            .hero h1 {
                font-size: 48px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 40px;
            }

            .instructors-carousel {
                padding: 0 40px;
            }

            .instructor-card {
                min-width: 280px;
            }

            .testimonial-card {
                min-width: 400px;
            }

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

            .features-grid {
                grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            }
        }

        @media (max-width: 992px) {
            .navbar {
                padding: 0 24px;
            }

            .nav-links {
                gap: 20px;
                font-size: 14px;
            }

            .hero h1 {
                font-size: 42px;
            }

            .hero-description {
                font-size: 18px;
            }

            .section-header h2 {
                font-size: 40px;
            }

            .instructors-carousel {
                padding: 0 20px;
            }

            .carousel-nav {
                width: 40px;
                height: 40px;
                font-size: 14px;
            }

            .instructor-card {
                min-width: 260px;
                padding: 24px;
            }

            .testimonial-card {
                min-width: 360px;
                padding: 24px;
            }

            .floating-card {
                padding: 20px;
            }

            .floating-card-1 {
                width: 240px !important;
            }

            .floating-card-2 {
                width: 200px !important;
            }

            .floating-card-3 {
                width: 220px !important;
            }
        }

        @media (max-width: 768px) {
            .navbar {
                padding: 0 20px;
                gap: 16px;
            }

            .nav-links {
                display: none;
            }

            .auth-buttons {
                gap: 8px;
            }

            .btn {
                padding: 8px 16px;
                font-size: 13px;
            }

            .logo {
                font-size: 24px;
            }

            .hero {
                padding: 100px 20px 60px;
            }

            .hero h1 {
                font-size: 32px;
                letter-spacing: -1px;
            }

            .hero-description {
                font-size: 16px;
                margin-bottom: 32px;
            }

            .hero-buttons {
                flex-direction: column;
                gap: 12px;
            }

            .hero-buttons .btn {
                width: 100%;
                text-align: center;
                padding: 12px 24px;
            }

            .hero-visual {
                height: 350px;
                margin-top: 40px;
            }

            .floating-card {
                width: 180px !important;
                padding: 16px;
            }

            .floating-card h4 {
                font-size: 14px;
            }

            .floating-card p {
                font-size: 12px;
            }

            .card-icon {
                width: 40px;
                height: 40px;
                font-size: 20px;
                margin-bottom: 10px;
            }

            .card-stats {
                flex-direction: column;
                gap: 8px !important;
                margin-top: 12px !important;
                padding-top: 12px !important;
            }

            .section-header h2 {
                font-size: 32px;
            }

            .section-header p {
                font-size: 16px;
                padding: 0 10px;
            }

            .section-label {
                font-size: 12px;
                padding: 6px 16px;
            }

            /* Instructors responsive */
            .instructors-section {
                padding: 80px 20px;
            }

            .instructors-carousel {
                padding: 0 10px;
            }

            .carousel-nav {
                width: 36px;
                height: 36px;
                font-size: 12px;
            }

            .carousel-nav.prev {
                left: -5px;
            }

            .carousel-nav.next {
                right: -5px;
            }

            .instructors-track {
                gap: 16px;
                padding: 10px 0;
            }

            .instructor-card {
                min-width: 240px;
                padding: 20px;
            }

            .instructor-avatar {
                width: 100px;
                height: 100px;
                margin-bottom: 16px;
            }

            .instructor-info h3 {
                font-size: 18px;
            }

            .instructor-meta {
                font-size: 13px;
                gap: 12px;
            }

            /* Categories responsive */
            .categories-section {
                padding: 80px 20px;
            }

            .categories-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }

            .category-card {
                padding: 24px 16px;
            }

            .category-icon {
                width: 52px;
                height: 52px;
                font-size: 24px;
                margin-bottom: 12px;
            }

            .category-card h3 {
                font-size: 14px;
            }

            /* Features responsive */
            .features-section {
                padding: 80px 20px;
            }

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

            .feature-card {
                padding: 28px 24px;
            }

            .feature-icon {
                width: 56px;
                height: 56px;
                font-size: 24px;
                margin-bottom: 20px;
            }

            .feature-card h3 {
                font-size: 20px;
            }

            .feature-card p {
                font-size: 15px;
            }

            /* Courses responsive */
            .courses-section {
                padding: 80px 20px;
            }

            .courses-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .course-card {
                border-radius: 20px;
            }

            .course-image {
                height: 200px;
            }

            .course-content {
                padding: 20px;
            }

            .course-title {
                font-size: 18px;
            }

            /* Testimonials responsive */
            .testimonials-section {
                padding: 80px 20px;
            }

            .testimonials-slider {
                padding: 0 10px;
            }

            .testimonials-track {
                gap: 20px;
                padding: 10px 0;
            }

            .testimonial-card {
                min-width: 300px;
                padding: 24px;
            }

            .testimonial-header {
                flex-wrap: wrap;
                gap: 12px;
            }

            .testimonial-avatar {
                width: 48px;
                height: 48px;
            }

            .testimonial-author h4 {
                font-size: 15px;
            }

            .testimonial-author p {
                font-size: 12px;
            }

            .testimonial-stars {
                font-size: 14px;
                width: 100%;
                justify-content: flex-start;
            }

            .testimonial-quote {
                font-size: 14px;
                line-height: 1.6;
            }

            /* Stats responsive */
            .stats-section {
                padding: 60px 20px;
            }

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }

            .stat-number {
                font-size: 42px;
            }

            .stat-label {
                font-size: 16px;
            }

            /* Footer responsive */
            footer {
                padding: 60px 20px 30px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
                margin-bottom: 40px;
            }

            .footer-brand h3 {
                font-size: 24px;
            }

            .footer-column h4 {
                font-size: 15px;
                margin-bottom: 16px;
            }

            .footer-links li {
                margin-bottom: 10px;
            }

            .footer-bottom {
                font-size: 13px;
                padding-top: 24px;
            }
        }

        @media (max-width: 480px) {
            .hero h1 {
                font-size: 28px;
                line-height: 1.2;
            }

            .hero-description {
                font-size: 15px;
            }

            .hero-badge {
                font-size: 11px;
                padding: 6px 14px;
            }

            .hero-visual {
                height: 300px;
            }

            .floating-card {
                width: 160px !important;
                padding: 12px;
            }

            .floating-card h4 {
                font-size: 13px;
            }

            .floating-card p {
                font-size: 11px;
            }

            .card-icon {
                width: 36px;
                height: 36px;
                font-size: 18px;
                margin-bottom: 8px;
            }

            .card-stat {
                font-size: 11px;
            }

            .section-header h2 {
                font-size: 28px;
                line-height: 1.2;
            }

            .section-header p {
                font-size: 15px;
            }

            .instructor-card {
                min-width: 220px;
                padding: 18px;
            }

            .instructor-avatar {
                width: 90px;
                height: 90px;
            }

            .instructor-info h3 {
                font-size: 16px;
            }

            .instructor-meta {
                font-size: 12px;
                flex-direction: column;
                gap: 8px;
            }

            .testimonial-card {
                min-width: 280px;
                padding: 20px;
                gap: 20px;
            }

            .testimonial-avatar {
                width: 44px;
                height: 44px;
            }

            .testimonial-author h4 {
                font-size: 14px;
            }

            .testimonial-quote {
                font-size: 13px;
            }

            .testimonial-course-img {
                width: 40px;
                height: 40px;
            }

            .testimonial-course-info h5 {
                font-size: 13px;
            }

            .course-image {
                height: 180px;
            }

            .course-badge {
                font-size: 11px;
                padding: 4px 12px;
            }

            .course-content {
                padding: 18px;
            }

            .course-title {
                font-size: 16px;
            }

            .course-meta,
            .course-info {
                font-size: 12px;
            }

            .categories-grid {
                grid-template-columns: 1fr;
            }

            .category-card {
                padding: 20px 16px;
            }

            .category-icon {
                width: 48px;
                height: 48px;
                font-size: 22px;
            }

            .feature-card {
                padding: 24px 20px;
            }

            .feature-icon {
                width: 52px;
                height: 52px;
                font-size: 22px;
            }

            .feature-card h3 {
                font-size: 18px;
            }

            .feature-card p {
                font-size: 14px;
            }

            .stats-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .stat-number {
                font-size: 36px;
            }

            .stat-label {
                font-size: 15px;
            }

            .carousel-nav {
                display: none;
            }

            .instructors-carousel,
            .testimonials-slider {
                padding: 0;
            }

            .btn-primary.btn-lg {
                padding: 12px 28px;
                font-size: 15px;
            }
        }

        /* Loading Animation */
        @keyframes shimmer {
            0% { background-position: -1000px 0; }
            100% { background-position: 1000px 0; }
        }

        .skeleton {
            background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
            background-size: 1000px 100%;
            animation: shimmer 2s infinite;
        }
    </style>
</head>