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

body {
    font-family: 'Noto Sans', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

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

/* Header & Navigation */
.hero {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-brand h2 {
    font-family: 'Space Mono', monospace;
    font-size: 1.8rem;
    margin-bottom: 5px;
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.8;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.nav-links a:hover {
    opacity: 0.7;
}

/* Hero Section */
.hero-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 30px;
    line-height: 1.2;
    animation: fadeInUp 1s ease;
}

.highlight {
    color: #ffd700;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.5);
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
    animation: fadeInUp 1s ease 0.3s both;
}

.cta-button {
    background: #ffd700;
    color: #333;
    border: none;
    padding: 15px 40px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    animation: fadeInUp 1s ease 0.6s both;
}

.cta-button:hover {
    background: #ffed4a;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.3);
}

/* Courses Section */
.courses-section {
    padding: 100px 0;
    background: #f8f9fa;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 40px;
}

.course-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    animation: fadeInUp 0.6s ease;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
}

.course-image {
    height: 200px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    position: relative;
    background-size: cover;
    background-position: center;
}

.course-card:nth-child(1) .course-image {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 200"><rect fill="%23667eea" width="400" height="200"/><g fill="white" opacity="0.3"><circle cx="50" cy="50" r="8"/><circle cx="150" cy="80" r="8"/><circle cx="250" cy="60" r="8"/><circle cx="350" cy="90" r="8"/><circle cx="100" cy="130" r="8"/><circle cx="200" cy="140" r="8"/><circle cx="300" cy="120" r="8"/><line x1="50" y1="50" x2="150" y2="80" stroke="white" stroke-width="2"/><line x1="150" y1="80" x2="250" y2="60" stroke="white" stroke-width="2"/><line x1="250" y1="60" x2="350" y2="90" stroke="white" stroke-width="2"/><line x1="150" y1="80" x2="100" y2="130" stroke="white" stroke-width="2"/><line x1="250" y1="60" x2="200" y2="140" stroke="white" stroke-width="2"/><line x1="350" y1="90" x2="300" y2="120" stroke="white" stroke-width="2"/></g></svg>');
}

.course-card:nth-child(2) .course-image {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 200"><rect fill="%23764ba2" width="400" height="200"/><g fill="white" opacity="0.4"><rect x="50" y="150" width="30" height="30"/><rect x="90" y="120" width="30" height="60"/><rect x="130" y="100" width="30" height="80"/><rect x="170" y="80" width="30" height="100"/><rect x="210" y="70" width="30" height="110"/><rect x="250" y="60" width="30" height="120"/><rect x="290" y="90" width="30" height="90"/><rect x="330" y="110" width="30" height="70"/></g></svg>');
}

.course-card:nth-child(3) .course-image {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 200"><rect fill="%23667eea" width="400" height="200"/><g fill="white" opacity="0.3"><path d="M50 150 Q100 50 150 100 T250 80 Q300 40 350 90" stroke="white" stroke-width="3" fill="none"/><circle cx="50" cy="150" r="5"/><circle cx="100" cy="75" r="5"/><circle cx="150" cy="100" r="5"/><circle cx="200" cy="85" r="5"/><circle cx="250" cy="80" r="5"/><circle cx="300" cy="65" r="5"/><circle cx="350" cy="90" r="5"/><text x="20" y="170" font-family="monospace" font-size="12" fill="white">f(x)</text><text x="360" y="50" font-family="monospace" font-size="12" fill="white">∞</text></g></svg>');
}

.course-image::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 3rem;
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-card:nth-child(1) .course-image::after {
    content: '🔗';
}

.course-card:nth-child(2) .course-image::after {
    content: '📊';
}

.course-card:nth-child(3) .course-image::after {
    content: '⚡';
}

.course-content {
    padding: 30px;
}

.course-content h3 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

.course-description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #666;
    margin-bottom: 20px;
}

.course-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 20px;
}

.course-btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.course-btn:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

/* About Section */
.about-section {
    padding: 100px 0;
    background: white;
}

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

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    color: #333;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
    margin-bottom: 20px;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.stat {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 15px;
}

.stat h3 {
    font-size: 2.5rem;
    font-weight: 800;
    color: #667eea;
    margin-bottom: 10px;
}

.stat p {
    color: #666;
    font-weight: 500;
}

/* Testimonials */
.testimonials {
    padding: 100px 0;
    background: #667eea;
    color: white;
}

.testimonials h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.testimonial-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 40px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    animation: fadeInUp 0.8s ease;
}

.testimonial-card p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 20px;
}

.testimonial-author {
    font-weight: 600;
    color: #ffd700;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 20px;
}

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

.footer-section h4 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #ffd700;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none;
    }
}