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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.nav-brand i {
    margin-right: 8px;
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.cta-button {
    background: var(--primary-color);
    color: white !important;
    padding: 10px 20px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.cta-button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
}

.hero-title .highlight {
    color: #fbbf24;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    color: #e5e7eb;
    margin-bottom: 1.5rem;
}

.hero-description {
    font-size: 1.125rem;
    color: #d1d5db;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    gap: 30px;
    margin-bottom: 2.5rem;
}

.stat {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.stat i {
    color: var(--accent-color);
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--accent-color);
    color: var(--bg-dark);
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.125rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
}

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

.hero-visual {
    position: relative;
}

.code-preview {
    background: var(--bg-dark);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    transform: rotate(2deg);
    transition: transform 0.3s ease;
}

.code-preview:hover {
    transform: rotate(0deg);
}

.code-header {
    background: #374151;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.code-controls {
    display: flex;
    gap: 8px;
}

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

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

.filename {
    color: #d1d5db;
    font-size: 0.875rem;
}

.code-content {
    padding: 20px;
    color: #e5e7eb;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.code-content pre {
    margin: 0;
}

/* Section Styles */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

/* Features Section */
.features {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--bg-primary);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: white;
    font-size: 2rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Curriculum Section */
.curriculum {
    padding: 80px 0;
}

.curriculum-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 60px;
    align-items: start;
}

.curriculum-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.curriculum-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.curriculum-item i {
    color: var(--secondary-color);
    margin-top: 2px;
    font-size: 1.25rem;
}

.curriculum-item span {
    font-weight: 500;
    line-height: 1.6;
}

.tech-stack {
    background: var(--bg-primary);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.tech-stack h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 25px;
    text-align: center;
    color: var(--text-primary);
}

.tech-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tech-badge {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Requirements Section */
.requirements {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.requirement-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 25px;
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.requirement-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.requirement-item span {
    font-weight: 500;
}

/* Audience Section */
.audience {
    padding: 80px 0;
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.audience-card {
    background: var(--bg-primary);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.audience-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.audience-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.audience-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Instructor Section */
.instructor {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.instructor-card {
    background: var(--bg-primary);
    padding: 50px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.instructor-info h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.instructor-title {
    font-size: 1.125rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 25px;
}

.instructor-stats {
    display: flex;
    gap: 30px;
    margin-bottom: 25px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stat-item i {
    color: var(--accent-color);
}

.instructor-bio {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
}

/* CTA Section */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    color: #e5e7eb;
}

.cta-button-large {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--accent-color);
    color: var(--bg-dark);
    padding: 20px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.25rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-xl);
}

.cta-button-large:hover {
    transform: translateY(-3px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.cta-note {
    margin-top: 20px;
    color: #d1d5db;
    font-size: 0.875rem;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--accent-color);
}

.footer-section p {
    color: #d1d5db;
    line-height: 1.6;
}

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

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

.footer-section ul li a {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .curriculum-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .features-grid,
    .audience-grid {
        grid-template-columns: 1fr;
    }
    
    .requirements-grid {
        grid-template-columns: 1fr;
    }
    
    .instructor-stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .instructor-card {
        padding: 30px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .feature-card,
    .audience-card {
        padding: 30px 20px;
    }
    
    .cta-content h2 {
        font-size: 2rem;
    }
    
    .cta-button-large {
        padding: 15px 30px;
        font-size: 1.125rem;
    }
}