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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 60px;
    padding-top: 40px;
}

header h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.demo-card {
    background: white;
    border-radius: 16px;
    padding: 40px 30px;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.demo-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.card-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.demo-card h2 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #667eea;
}

.demo-card p {
    font-size: 1rem;
    color: #666;
    margin-bottom: 25px;
    line-height: 1.6;
}

.launch-btn {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 30px;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.demo-card:hover .launch-btn {
    transform: scale(1.05);
}

footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    padding: 20px;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .demo-grid {
        grid-template-columns: 1fr;
    }
}