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

:root {
    /* Colors */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-secondary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(99, 102, 241, 0.9) 0%, rgba(139, 92, 246, 0.9) 100%);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Shadows */
    --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), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-dark);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color var(--transition-fast);
}

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

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--bg-white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--bg-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem var(--spacing-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-brand i {
    font-size: 1.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--text-dark);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) 0;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8eef5 100%);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
    opacity: 0.1;
}

.neural-network {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(90deg, var(--primary-color) 0, var(--primary-color) 2px, transparent 2px, transparent 50px),
        repeating-linear-gradient(0deg, var(--primary-color) 0, var(--primary-color) 2px, transparent 2px, transparent 50px);
    animation: networkPulse 20s ease-in-out infinite;
}

@keyframes networkPulse {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease-out;
}

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

.hero-title {
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.ai-illustration {
    width: 300px;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: var(--shadow-xl);
    animation: float 6s ease-in-out infinite;
}

.ai-illustration i {
    font-size: 10rem;
    color: var(--bg-white);
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.scroll-indicator a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* ===================================
   Section Styles
   =================================== */
section {
    padding: var(--spacing-xl) 0;
}

section:nth-child(even) {
    background-color: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    margin-bottom: var(--spacing-sm);
}

.title-underline {
    width: 80px;
    height: 4px;
    background: var(--gradient-primary);
    margin: 0 auto var(--spacing-sm);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 900px;
    margin: 0 auto;
}

/* ===================================
   About Section
   =================================== */
.about-content {
    display: grid;
    gap: var(--spacing-lg);
}

.about-description {
    text-align: center;
}

.about-text {
    font-size: 1.125rem;
    line-height: 1.8;
    max-width: 900px;
    margin: 0 auto;
}

.about-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.detail-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

.detail-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.detail-icon i {
    font-size: 2rem;
    color: var(--bg-white);
}

.detail-card h3 {
    margin-bottom: var(--spacing-sm);
}

.detail-card ul {
    list-style: none;
    padding-left: 0;
}

.detail-card li {
    padding: 0.5rem 0;
    color: var(--text-light);
}

/* ===================================
   Program Section
   =================================== */
.program-modules {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.module-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    transition: all var(--transition-base);
    border-top: 4px solid transparent;
}

.module-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-top-color: var(--primary-color);
}

.module-number {
    position: absolute;
    top: -20px;
    right: var(--spacing-md);
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0.3;
}

.module-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.module-icon i {
    font-size: 2rem;
    color: var(--bg-white);
}

.module-title {
    margin-bottom: var(--spacing-sm);
}

.module-format {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
}

.module-topics {
    list-style: none;
    padding-left: 0;
}

.module-topics li {
    padding: 0.5rem 0;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.module-topics i {
    color: var(--primary-color);
}

/* ===================================
   Benefits Section
   =================================== */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.benefit-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
}

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

.benefit-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    margin: 0 auto var(--spacing-sm);
}

.benefit-icon i {
    font-size: 2.5rem;
    color: var(--bg-white);
}

.benefit-card h3 {
    margin-bottom: var(--spacing-sm);
}

/* ===================================
   Author Section
   =================================== */
.author-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.author-photo {
    display: flex;
    justify-content: center;
}

.photo-placeholder {
    width: 250px;
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: var(--shadow-xl);
}

.photo-placeholder i {
    font-size: 8rem;
    color: var(--bg-white);
}

.author-name {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.author-title {
    color: var(--primary-color);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.author-description p {
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
    line-height: 1.8;
}

.author-partners {
    margin-top: var(--spacing-md);
}

.author-partners h4 {
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.partner-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--gradient-primary);
    color: var(--bg-white);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
}

/* ===================================
   Reviews Section
   =================================== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
}

.review-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

.review-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.reviewer-avatar {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
}

.reviewer-avatar i {
    font-size: 2rem;
    color: var(--bg-white);
}

.reviewer-name {
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
}

.reviewer-position {
    color: var(--text-light);
    font-size: 0.875rem;
}

.review-stars {
    margin-bottom: var(--spacing-sm);
}

.review-stars i {
    color: #fbbf24;
    margin-right: 2px;
}

.review-text {
    font-style: italic;
    color: var(--text-light);
    line-height: 1.8;
}

/* ===================================
   Pricing Section
   =================================== */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.pricing-card {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    border: 2px solid transparent;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.featured-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: var(--bg-white);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    margin: 0 auto var(--spacing-sm);
}

.pricing-icon i {
    font-size: 2.5rem;
    color: var(--bg-white);
}

.pricing-title {
    margin-bottom: var(--spacing-md);
}

.pricing-amount {
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
}

.price-from {
    font-size: 1rem;
    color: var(--text-light);
}

.price {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.currency {
    font-size: 1.25rem;
    color: var(--text-light);
}

.pricing-features {
    list-style: none;
    padding: 0;
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.pricing-features li {
    padding: 0.75rem 0;
    color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features i {
    color: var(--primary-color);
}

/* ===================================
   Contact Section
   =================================== */
.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.contact-form {
    background: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group textarea {
    padding: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-submit {
    grid-column: 1 / -1;
    justify-content: center;
}

.form-message {
    grid-column: 1 / -1;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    text-align: center;
    display: none;
}

.form-message.success {
    display: block;
    background-color: #d1fae5;
    color: #065f46;
}

.form-message.error {
    display: block;
    background-color: #fee2e2;
    color: #991b1b;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.info-card {
    background: var(--bg-white);
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-base);
}

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

.info-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    margin: 0 auto var(--spacing-xs);
}

.info-icon i {
    font-size: 1.5rem;
    color: var(--bg-white);
}

.info-card h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

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

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--text-dark);
    color: var(--bg-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 700;
}

.footer-brand i {
    font-size: 1.5rem;
    color: var(--primary-light);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links a {
    color: var(--bg-white);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--primary-light);
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--bg-white);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

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

.footer-bottom p {
    color: var(--bg-white);
    opacity: 0.7;
    margin: 0;
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--bg-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.back-to-top i {
    font-size: 1.25rem;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .author-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .partner-badges {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--bg-white);
        width: 100%;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-base);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero {
        min-height: auto;
        padding: calc(var(--spacing-xl) + 70px) 0 var(--spacing-lg);
    }
    
    .ai-illustration {
        width: 200px;
        height: 200px;
    }
    
    .ai-illustration i {
        font-size: 6rem;
    }
    
    .contact-form {
        grid-template-columns: 1fr;
    }
    
    .form-group {
        grid-column: 1;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .photo-placeholder {
        width: 180px;
        height: 180px;
    }
    
    .photo-placeholder i {
        font-size: 5rem;
    }
    
    .pricing-card.featured {
        transform: scale(1);
    }
    
    .pricing-card.featured:hover {
        transform: scale(1) translateY(-10px);
    }
}
.about-cards {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-top: 30px;
}

.about-card {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 16px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    padding: 25px 20px;
    text-align: center;
    max-width: 300px;
    flex: 1;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-card i {
    font-size: 36px;
    color: #5b4bff;
    margin-bottom: 10px;
}

.about-card h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #222;
}

.about-card p {
    color: #555;
    font-size: 15px;
    line-height: 1.5;
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 18px rgba(0,0,0,0.1);
}
.about {
  padding: 80px 0;
  background-color: #fafafa;
}

.about-intro {
  max-width: 800px;
  margin: 0 auto 40px auto;
  text-align: center;
  font-size: 18px;
  line-height: 1.6;
  color: #333;
}

.about-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 30px;
}

.about-card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  padding: 30px 25px;
  max-width: 380px;
  flex: 1 1 320px;
  transition: all 0.3s ease;
}

.about-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.about-icon {
  text-align: center;
  margin-bottom: 15px;
}

.about-icon i {
  font-size: 36px;
  color: #5b4bff;
}

.about-card h3 {
  text-align: center;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 15px;
  color: #222;
}

.about-card p {
  text-align: center;
  color: #555;
  font-size: 16px;
  line-height: 1.5;
}

.about-card ul {
  margin-top: 15px;
  padding-left: 20px;
  color: #333;
  font-size: 15px;
  line-height: 1.6;
}

.about-card li {
  margin-bottom: 6px;
}
/* === Новый стиль карточек "О курсе" === */
.about {
  padding: 80px 0;
  background-color: #f8f9fc;
}

.about-intro {
  max-width: 800px;
  margin: 0 auto 40px auto;
  text-align: center;
  font-size: 18px;
  line-height: 1.6;
  color: #333;
}

.about-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 40px;
}

.about-card {
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
  padding: 30px 25px 40px;
  max-width: 360px;
  flex: 1 1 320px;
  text-align: left;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.about-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.about-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #8b5cf6, #5b4bff);
  color: #fff;
  font-size: 24px;
  border-radius: 14px;
  width: 50px;
  height: 50px;
  margin-bottom: 15px;
}

.about-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: #1e1e2f;
  margin-bottom: 12px;
}

.about-card p {
  color: #555;
  font-size: 15.5px;
  margin-bottom: 12px;
  line-height: 1.5;
}

.about-card ul {
  margin: 0;
  padding-left: 20px;
  color: #333;
  font-size: 15px;
  line-height: 1.6;
}

.about-card li {
  margin-bottom: 6px;
  list-style-type: "✓ ";
  color: #5b4bff;
  font-weight: 500;
}

.about-card li span {
  color: #333;
  font-weight: 400;
}
/* --- Унификация блока "О курсе" под карточки в 2 колонки --- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  align-items: stretch;
  justify-items: center;
}

.about .benefit-card {
  max-width: 100%;
  text-align: left;
}
/* Certificates Styling */
.author-certificates {
    margin-top: 30px;
}

.author-certificates h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-color);
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 15px;
    justify-items: center;
}

.certificate-item {
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s ease;
    background: rgba(255, 255, 255, 0.05);
    background-color: rgba(255, 255, 255, 0.15);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.certificate-item:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(100, 100, 255, 0.3);
}

.certificate-thumbnail {
    width: 100%;
    height: auto;
    max-height: 280px;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    cursor: pointer;
    background: white;
}

.certificate-thumbnail:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    transform: scale(1.03);
}

.certificate-label {
    margin-top: 12px;
    font-size: 0.95rem;
    color: var(--text-color);
    font-weight: 500;
    line-height: 1.4;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Certificate Modal */
.certificate-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    padding-top: 50px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.95);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 85vh;
    object-fit: contain;
    animation: zoomIn 0.3s ease;
    border-radius: 8px;
}

@keyframes zoomIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 40px;
    color: #fff;
    font-size: 45px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
    z-index: 10000;
}

.modal-close:hover,
.modal-close:focus {
    color: #f44336;
    transform: rotate(90deg);
}

#modalCaption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #fff;
    padding: 20px 0;
    font-size: 1.2rem;
    font-weight: 500;
}

/* Responsive adjustments */
@media (max-width: 968px) {
    .certificates-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .certificate-thumbnail {
        max-height: 220px;
    }
}

@media (max-width: 768px) {
    .certificates-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .certificate-thumbnail {
        max-height: 300px;
    }
    
    .modal-content {
        max-width: 95%;
        padding: 10px;
    }
    
    .modal-close {
        top: 10px;
        right: 20px;
        font-size: 35px;
    }
    
    #modalCaption {
        font-size: 1rem;
        padding: 15px 10px;
    }
}

@media (max-width: 480px) {
    .certificate-item {
        padding: 12px;
    }
    
    .certificate-label {
        font-size: 0.85rem;
        min-height: 35px;
    }
}
/* Certificates Styling */
.author-certificates {
    margin-top: 30px;
}

.author-certificates h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-color);
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 15px;
    justify-items: center;
}

.certificate-item {
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s ease;
    background: rgba(255, 255, 255, 0.05);
    background-color: rgba(255, 255, 255, 0.15);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.certificate-item:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(100, 100, 255, 0.3);
}

.certificate-thumbnail {
    width: 100%;
    height: auto;
    max-height: 280px;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    cursor: pointer;
    background: white;
}

.certificate-thumbnail:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    transform: scale(1.03);
}

.certificate-label {
    margin-top: 12px;
    font-size: 0.95rem;
    color: var(--text-color);
    font-weight: 500;
    line-height: 1.4;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Certificate Modal */
.certificate-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    padding-top: 50px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.95);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 85vh;
    object-fit: contain;
    animation: zoomIn 0.3s ease;
    border-radius: 8px;
}

@keyframes zoomIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 40px;
    color: #fff;
    font-size: 45px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
    z-index: 10000;
}

.modal-close:hover,
.modal-close:focus {
    color: #f44336;
    transform: rotate(90deg);
}

#modalCaption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #fff;
    padding: 20px 0;
    font-size: 1.2rem;
    font-weight: 500;
}

/* Responsive adjustments */
@media (max-width: 968px) {
    .certificates-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .certificate-thumbnail {
        max-height: 220px;
    }
}

@media (max-width: 768px) {
    .certificates-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .certificate-thumbnail {
        max-height: 300px;
    }
    
    .modal-content {
        max-width: 95%;
        padding: 10px;
    }
    
    .modal-close {
        top: 10px;
        right: 20px;
        font-size: 35px;
    }
    
    #modalCaption {
        font-size: 1rem;
        padding: 15px 10px;
    }
}

@media (max-width: 480px) {
    .certificate-item {
        padding: 12px;
    }
    
    .certificate-label {
        font-size: 0.85rem;
        min-height: 35px;
    }
}
.ai-highlight {
    display: inline-block;
    background: linear-gradient(90deg, #6366f1, #8b5cf6);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent !important;
    font-weight: 600;
}