:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --success: #10b981;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #94a3b8;

    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;
    --bg-card: #ffffff;

    --border-radius: 16px;
    --border-radius-lg: 24px;
    --border-radius-sm: 12px;

    --shadow-sm: 0 1px 3px 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), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.8) 0%, transparent 70%);
    top: -250px;
    right: -250px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.8) 0%, transparent 70%);
    bottom: -200px;
    left: -200px;
    animation-delay: 7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.8) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 14s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(50px, -50px) scale(1.1);
    }
    66% {
        transform: translate(-50px, 50px) scale(0.9);
    }
}

/* Navbar */
.navbar {
    position: relative;
    z-index: 100;
    padding: 24px 0;
}

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

.logo {
    font-size: 24px;
    font-weight: 800;
    color: white;
    letter-spacing: -0.5px;
}

.nav-cta {
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-sm);
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.nav-cta:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Hero Content */
.hero-content {
    position: relative;
    z-index: 10;
    padding: 120px 0 80px;
}

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

.hero-title {
    font-size: clamp(40px, 7vw, 64px);
    font-weight: 900;
    color: white;
    margin-bottom: 24px;
    line-height: 1.15;
    letter-spacing: -1.5px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle {
    font-size: clamp(18px, 3vw, 24px);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 48px;
    line-height: 1.6;
    font-weight: 400;
}

.hero-cta-group {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 80px;
}

.cta-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: white;
    color: var(--primary);
    text-decoration: none;
    font-weight: 700;
    font-size: 18px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

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

.cta-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.cta-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
}

.cta-large {
    padding: 20px 40px;
    font-size: 20px;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 48px;
    font-weight: 900;
    color: white;
    line-height: 1;
    margin-bottom: 8px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.stat-label {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

/* Section */
.section {
    padding: 120px 0;
    position: relative;
}

.section-dark {
    background: var(--bg-dark);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-badge {
    display: inline-block;
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-dark .section-badge {
    background: linear-gradient(135deg, var(--accent), var(--primary-light));
}

.section-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 900;
    margin-bottom: 16px;
    letter-spacing: -1.5px;
}

.section-dark .section-title {
    color: white;
}

.section-description {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.section-dark .section-description {
    color: rgba(255, 255, 255, 0.7);
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
    cursor: pointer;
}

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

.card-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: white;
}

.card[data-category="automation"] .card-icon {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.card[data-category="ai"] .card-icon {
    background: linear-gradient(135deg, #f093fb, #f5576c);
}

.card[data-category="fundamentals"] .card-icon {
    background: linear-gradient(135deg, #4facfe, #00f2fe);
}

.card[data-category="business"] .card-icon {
    background: linear-gradient(135deg, #43e97b, #38f9d7);
}

.card[data-category="coding"] .card-icon {
    background: linear-gradient(135deg, #fa709a, #fee140);
}

.card-title {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.card-description {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.card-experts {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.expert-tag {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: 6px;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 32px;
    transition: var(--transition);
}

.feature-card:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent), var(--primary-light));
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: white;
}

.feature-title {
    font-size: 20px;
    font-weight: 700;
    color: white;
    margin-bottom: 12px;
}

.feature-description {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
}

/* Levels Container */
.levels-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.level-card {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 32px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.level-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-light);
}

.level-featured {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    grid-column: span 2;
}

.level-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.level-number {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 16px;
}

.level-title {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 12px;
}

.level-featured .level-title {
    color: white;
}

.level-description {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.level-featured .level-description {
    color: rgba(255, 255, 255, 0.9);
}

.level-experts {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.level-cta {
    display: inline-block;
    margin-top: 16px;
    padding: 14px 28px;
    background: white;
    color: var(--primary);
    text-decoration: none;
    font-weight: 700;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.level-cta:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* CTA Section */
.cta-section {
    padding: 120px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg width="60" height="60" viewBox="0 0 60 60" xmlns="http://www.w3.org/2000/svg"><g fill="none" fill-rule="evenodd"><g fill="%23ffffff" fill-opacity="0.05"><path d="M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z"/></g></g></svg>');
    opacity: 0.3;
}

.cta-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 900;
    color: white;
    margin-bottom: 24px;
    letter-spacing: -1.5px;
}

.cta-description {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 48px;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    padding: 64px 0 32px;
    color: white;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 48px;
    flex-wrap: wrap;
    gap: 32px;
}

.footer-brand {
    max-width: 300px;
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.6);
    margin-top: 8px;
}

.footer-links {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content {
        padding: 80px 0 60px;
    }

    .hero-stats {
        gap: 32px;
    }

    .section {
        padding: 80px 0;
    }

    .cards-grid,
    .features-grid,
    .levels-container {
        grid-template-columns: 1fr;
    }

    .level-featured {
        grid-column: span 1;
    }

    .hero-cta-group {
        flex-direction: column;
        align-items: stretch;
    }

    .cta-primary,
    .cta-secondary {
        justify-content: center;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-brand {
        max-width: 100%;
    }

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .card,
    .feature-card,
    .level-card {
        padding: 24px;
    }
}

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

.card,
.feature-card,
.level-card {
    animation: fadeInUp 0.6s ease-out;
}

/* Smooth scroll */
@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

/* Video Section */
.video-section {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.video-container {
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

/* Testimonials Section */
.testimonials-carousel {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    overflow: hidden;
}

.testimonials-wrapper {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.testimonial-card {
    min-width: 100%;
    padding: 48px;
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.testimonial-text {
    font-size: 20px;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 24px;
}

.author-info h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.author-info p {
    font-size: 14px;
    color: var(--text-secondary);
}

.carousel-controls {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 32px;
}

.carousel-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--primary);
    color: var(--primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 20px;
}

.carousel-btn:hover {
    background: var(--primary);
    color: white;
    transform: scale(1.1);
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(99, 102, 241, 0.3);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--primary);
    width: 32px;
    border-radius: 6px;
}

@media (max-width: 768px) {
    .testimonial-card {
        padding: 32px 24px;
    }

    .testimonial-text {
        font-size: 18px;
    }
}