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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #0f172a;
    --accent-color: #06b6d4;
    --text-color: #1e293b;
    --text-light: #64748b;
    --background: #ffffff;
    --background-alt: #f8fafc;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-dark: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    --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 -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-dark);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--secondary-color);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

p {
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

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

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-dark);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.navbar {
    padding: 1rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--secondary-color);
}

.logo:hover {
    color: var(--secondary-color);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-md);
    font-weight: 800;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    padding: 8rem 0 5rem;
    background: linear-gradient(180deg, var(--background-alt) 0%, var(--background) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.video-transform-animation {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 3rem;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.video-icon, .lesson-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    color: white;
}

.video-icon {
    background: var(--gradient-primary);
}

.video-icon svg, .lesson-icon svg {
    width: 40px;
    height: 40px;
}

.arrow {
    color: var(--primary-color);
    animation: pulse 2s infinite;
}

.arrow svg {
    width: 32px;
    height: 32px;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: translateX(0);
    }
    50% {
        opacity: 0.5;
        transform: translateX(5px);
    }
}

.lesson-icon {
    background: var(--success-color);
}

/* Adaptive Learning Section */
.adaptive-learning {
    padding: 5rem 0;
    background: var(--gradient-dark);
    color: white;
}

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

.adaptive-content h2 {
    color: white;
    margin-bottom: 1.5rem;
}

.adaptive-content p {
    font-size: 1.25rem;
    opacity: 0.9;
    line-height: 1.8;
}

/* Features Section */
.features {
    padding: 6rem 0;
    background: var(--background-alt);
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-alt);
    border-radius: var(--radius-md);
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-icon svg {
    width: 1.5rem;
    height: 1.5rem;
}

.feature-card h3 {
    color: var(--secondary-color);
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 0;
}

/* Audience Section */
.audience {
    padding: 6rem 0;
}

.audience h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
}

.audience-card {
    text-align: center;
    padding: 2rem 1rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.audience-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.audience-icon {
    width: 4rem;
    height: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background-alt);
    border-radius: 50%;
    color: var(--primary-color);
    margin: 0 auto 1rem;
}

.audience-icon svg {
    width: 2rem;
    height: 2rem;
}

.audience-card h3 {
    font-size: 1rem;
}

.audience-card p {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0;
}

/* CTA Section */
.cta {
    padding: 6rem 0;
    background: var(--gradient-primary);
    text-align: center;
}

.cta-content h2 {
    color: white;
    margin-bottom: 1rem;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

/* Footer */
footer {
    background: var(--secondary-color);
    color: white;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

.footer-brand .logo-text {
    color: white;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0.5rem;
}

.footer-brand .creator {
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 4rem;
    justify-content: flex-end;
}

.footer-column h4 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1rem;
}

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

.footer-column li {
    margin-bottom: 0.5rem;
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    transition: color 0.2s ease;
}

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

.footer-bottom {
    padding-top: 2rem;
    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: 0.875rem;
    margin-bottom: 0;
}

/* Legal Pages Styles */
.legal-page {
    padding: 8rem 0 4rem;
}

.legal-page .container {
    max-width: 800px;
}

.legal-page h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.last-updated {
    color: var(--text-light);
    margin-bottom: 3rem;
}

.legal-page h2 {
    font-size: 1.5rem;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.legal-page h3 {
    font-size: 1.125rem;
    margin-top: 1.5rem;
}

.legal-page p, .legal-page li {
    color: var(--text-light);
    line-height: 1.8;
}

.legal-page ul, .legal-page ol {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.legal-page li {
    margin-bottom: 0.5rem;
}

.legal-page a {
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .audience-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-visual {
        order: -1;
    }

    .video-transform-animation {
        padding: 2rem;
        gap: 1rem;
    }

    .video-icon, .lesson-icon {
        width: 60px;
        height: 60px;
    }

    .video-icon svg, .lesson-icon svg {
        width: 30px;
        height: 30px;
    }

    .nav-links {
        display: none;
    }

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

    .audience-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-links {
        justify-content: flex-start;
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .audience-grid {
        grid-template-columns: 1fr;
    }

    .footer-links {
        flex-direction: column;
    }
}