/* ==========================================
   CSS Variables & Reset
   ========================================== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #0ea5e9;
    --accent: #f59e0b;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --white: #ffffff;
    --success: #10b981;
    --error: #ef4444;
    --gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--dark);
    color: var(--gray-300);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ==========================================
   Utility Classes
   ========================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.section-header h2 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-400);
    max-width: 600px;
    margin: 0 auto;
}

/* ==========================================
   Buttons
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: var(--gradient);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--gray-600);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

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

.btn-full {
    width: 100%;
}

.btn-nav {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
}

/* ==========================================
   Navigation
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
    padding: 0.75rem 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--gradient);
    border-radius: var(--radius);
    color: var(--white);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--gray-300);
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--white);
    transition: var(--transition);
}

/* ==========================================
   Hero Section
   ========================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 0 4rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at top right, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at bottom left, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
    z-index: -1;
}

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

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(245, 158, 11, 0.1);
    color: var(--accent);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    color: var(--white);
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-400);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-700);
}

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

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--white);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* Code Window */
.hero-image {
    display: flex;
    justify-content: center;
}

.code-window {
    background: var(--dark-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--gray-700);
    width: 100%;
    max-width: 500px;
}

.code-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--gray-800);
    border-bottom: 1px solid var(--gray-700);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.file-name {
    margin-left: 1rem;
    font-size: 0.875rem;
    color: var(--gray-400);
}

.code-content {
    padding: 1.5rem;
    font-family: 'Fira Code', 'Monaco', monospace;
    font-size: 0.875rem;
    line-height: 1.8;
    overflow-x: auto;
}

.code-content code {
    color: var(--gray-300);
}

.code-content .tag {
    color: #f472b6;
}

.code-content .text {
    color: #a5f3fc;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--dark);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-700);
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    color: var(--primary-light);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--gray-400);
    line-height: 1.7;
}

/* ==========================================
   Curriculum Section
   ========================================== */
.curriculum {
    padding: 6rem 0;
}

.curriculum-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.module-card {
    display: flex;
    gap: 1.5rem;
    background: var(--dark-light);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-700);
    transition: var(--transition);
}

.module-card:hover {
    border-color: var(--primary);
}

.module-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.module-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 1rem;
}

.module-content ul {
    margin-bottom: 1rem;
}

.module-content li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-400);
    font-size: 0.9375rem;
    margin-bottom: 0.5rem;
}

.module-content li i {
    color: var(--success);
    font-size: 0.75rem;
}

.module-duration {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--primary-light);
}

/* ==========================================
   Instructor Section
   ========================================== */
.instructor {
    padding: 6rem 0;
    background: var(--dark-light);
}

.instructor-content {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4rem;
    align-items: center;
}

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

.instructor-avatar {
    width: 200px;
    height: 200px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    color: var(--white);
    margin: 0 auto 1rem;
}

.instructor-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
}

.instructor-info h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.instructor-title {
    font-size: 1.125rem;
    color: var(--primary-light);
    margin-bottom: 1.5rem;
}

.instructor-bio {
    font-size: 1.125rem;
    color: var(--gray-400);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.instructor-stats {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.inst-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-300);
}

.inst-stat i {
    color: var(--primary-light);
}

/* ==========================================
   Testimonials Section
   ========================================== */
.testimonials {
    padding: 6rem 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: var(--dark-light);
    padding: 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-700);
}

.testimonial-rating {
    margin-bottom: 1rem;
}

.testimonial-rating i {
    color: var(--accent);
    font-size: 1rem;
}

.testimonial-text {
    font-size: 1.0625rem;
    color: var(--gray-300);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--white);
}

.author-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
}

.author-info span {
    font-size: 0.875rem;
    color: var(--gray-500);
}

/* ==========================================
   Pricing Section
   ========================================== */
.pricing {
    padding: 6rem 0;
    background: var(--dark-light);
}

.pricing-card {
    max-width: 600px;
    margin: 0 auto;
    background: var(--dark);
    border-radius: var(--radius-xl);
    border: 2px solid var(--primary);
    padding: 3rem;
    position: relative;
    overflow: hidden;
}

.pricing-badge {
    position: absolute;
    top: 1.5rem;
    right: -2rem;
    background: var(--gradient);
    color: var(--white);
    padding: 0.5rem 3rem;
    font-size: 0.875rem;
    font-weight: 600;
    transform: rotate(45deg);
}

.pricing-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--gray-700);
}

.pricing-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 1rem;
}

.price {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.price-old {
    font-size: 1.5rem;
    color: var(--gray-500);
    text-decoration: line-through;
}

.price-current {
    font-size: 4rem;
    font-weight: 800;
    color: var(--white);
}

.price-period {
    font-size: 1rem;
    color: var(--gray-400);
}

.pricing-features {
    margin-bottom: 2rem;
}

.pricing-features ul {
    display: grid;
    gap: 1rem;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1rem;
    color: var(--gray-300);
}

.pricing-features li i {
    color: var(--success);
    font-size: 1.25rem;
}

.pricing-guarantee {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--gray-500);
}

.pricing-guarantee i {
    color: var(--success);
}

/* ==========================================
   FAQ Section
   ========================================== */
.faq {
    padding: 6rem 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--dark-light);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    border: 1px solid var(--gray-700);
    overflow: hidden;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 1.25rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    color: var(--white);
    font-size: 1.0625rem;
    font-weight: 600;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary-light);
}

.faq-question i {
    transition: var(--transition);
    color: var(--primary-light);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer p {
    padding: 0 1.5rem 1.25rem;
    color: var(--gray-400);
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

/* ==========================================
   Contact Section
   ========================================== */
.contact {
    padding: 6rem 0;
    background: var(--dark-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    align-items: start;
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary-light);
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 0.25rem;
}

.contact-details a,
.contact-details p {
    color: var(--gray-400);
}

.contact-details a:hover {
    color: var(--primary-light);
}

.contact-form {
    background: var(--dark);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-700);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-300);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--dark-light);
    border: 1px solid var(--gray-700);
    border-radius: var(--radius);
    color: var(--white);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-500);
}

.form-group select {
    cursor: pointer;
}

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

/* ==========================================
   Footer
   ========================================== */
.footer {
    background: var(--gray-900);
    padding: 4rem 0 2rem;
}

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

.footer-brand p {
    color: var(--gray-500);
    margin: 1rem 0;
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--gray-800);
    border-radius: var(--radius);
    color: var(--gray-400);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    color: var(--white);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 1.5rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: var(--gray-500);
    font-size: 0.9375rem;
}

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

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-500);
    font-size: 0.9375rem;
    margin-bottom: 0.75rem;
}

.footer-contact i {
    color: var(--primary-light);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
    text-align: center;
}

.footer-bottom p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-image {
        order: -1;
    }
    
    .code-window {
        max-width: 400px;
    }
    
    .instructor-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .instructor-stats {
        justify-content: center;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--dark-light);
        flex-direction: column;
        padding: 5rem 2rem 2rem;
        gap: 1.5rem;
        transition: var(--transition);
        border-left: 1px solid var(--gray-700);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .mobile-menu-btn {
        display: flex;
        z-index: 1001;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero {
        padding: 6rem 0 3rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .stat-item {
        text-align: center;
    }
    
    .features-grid,
    .curriculum-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .module-card {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
    }
    
    .code-window {
        font-size: 0.75rem;
    }
    
    .pricing-card {
        padding: 2rem 1.5rem;
    }
    
    .price-current {
        font-size: 3rem;
    }
    
    .contact-form {
        padding: 1.5rem;
    }
}

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

.animate-fade-in {
    animation: fadeInUp 0.6s ease forwards;
}