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

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #f472b6;
    --bg-dark: #0a0a0f;
    --bg-card: rgba(20, 20, 35, 0.8);
    --bg-card-hover: rgba(30, 30, 50, 0.9);
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-2: linear-gradient(135deg, #8b5cf6 0%, #f472b6 100%);
    --gradient-3: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --border-color: rgba(99, 102, 241, 0.2);
}

html {
    scroll-behavior: smooth;
}

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

#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 16px 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-icon {
    font-size: 24px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
}

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

.nav-cta {
    padding: 10px 24px;
    background: var(--gradient-1);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 48px 80px;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.badge-icon {
    font-size: 16px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.title-line {
    display: block;
    color: var(--text-primary);
}

.title-gradient {
    display: block;
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 48px;
    margin-bottom: 40px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 36px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--primary-color);
}

.btn-large {
    padding: 18px 36px;
    font-size: 18px;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    padding-left: 60px;
}

.code-window {
    background: #1e1e2e;
    border-radius: 16px;
    width: 100%;
    max-width: 500px;
    overflow: hidden;
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.window-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 16px 20px;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.dot.red { background: #ff5f57; }
.dot.yellow { background: #febc2e; }
.dot.green { background: #28c840; }

.window-title {
    margin-left: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}

.code-content {
    padding: 24px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 14px;
    line-height: 1.8;
    overflow-x: auto;
}

.code-content code {
    color: #cdd6f4;
}

.comment { color: #6c7086; }
.keyword { color: #cba6f7; }
.function { color: #89b4fa; }
.string { color: #a6e3a1; }

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 12px;
}

.mouse {
    width: 24px;
    height: 40px;
    border: 2px solid var(--text-secondary);
    border-radius: 12px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 2px;
    animation: scroll 1.5s infinite;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

.section {
    padding: 100px 48px;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.course-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 32px;
    position: relative;
    transition: all 0.3s ease;
    overflow: hidden;
}

.course-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary-color);
    transform: translateY(-4px);
}

.course-card.featured {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-color: var(--secondary-color);
}

.featured-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 6px 12px;
    background: var(--gradient-2);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}

.course-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--gradient-1);
    border-radius: 12px;
    font-size: 18px;
    font-weight: 800;
    margin-bottom: 20px;
}

.course-content h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
}

.course-content > p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 20px;
}

.course-topics {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.course-topics li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.topic-icon {
    color: var(--primary-color);
    font-weight: bold;
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.course-duration {
    font-size: 13px;
    color: var(--text-secondary);
}

.course-btn {
    padding: 8px 16px;
    background: transparent;
    border: 1px solid var(--primary-color);
    border-radius: 8px;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.features-section {
    background: linear-gradient(180deg, transparent 0%, rgba(99, 102, 241, 0.03) 50%, transparent 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.instructor-section {
    background: linear-gradient(180deg, transparent 0%, rgba(139, 92, 246, 0.03) 100%);
}

.instructor-card {
    display: flex;
    gap: 60px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 60px;
    max-width: 1000px;
    margin: 0 auto;
}

.instructor-avatar {
    width: 160px;
    height: 160px;
    background: var(--gradient-2);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    font-weight: 800;
    color: white;
    flex-shrink: 0;
}

.instructor-info {
    flex: 1;
}

.instructor-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.instructor-name {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 4px;
}

.instructor-title {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.instructor-badges {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.badge {
    padding: 6px 12px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    color: var(--primary-color);
}

.instructor-bio {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.instructor-stats {
    display: flex;
    gap: 40px;
}

.istat {
    display: flex;
    flex-direction: column;
}

.istat-number {
    font-size: 28px;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.istat-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.cta-section {
    padding: 120px 48px;
    text-align: center;
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-content p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.footer {
    padding: 60px 48px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    position: relative;
    z-index: 1;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-desc {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.footer-copy {
    font-size: 14px;
    color: var(--text-secondary);
}

@media (max-width: 1024px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        padding-left: 0;
        margin-top: 60px;
        justify-content: center;
    }

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

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

    .instructor-card {
        flex-direction: column;
        text-align: center;
        padding: 40px;
    }

    .instructor-avatar {
        margin: 0 auto;
    }

    .instructor-badges {
        justify-content: center;
    }

    .instructor-stats {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: 16px 24px;
    }

    .nav-links {
        display: none;
    }

    .hero {
        padding: 100px 24px 60px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .code-window {
        max-width: 100%;
    }

    .section {
        padding: 60px 24px;
    }

    .section-title {
        font-size: 32px;
    }

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

    .instructor-name {
        font-size: 28px;
    }

    .cta-content h2 {
        font-size: 28px;
    }
}