:root {
            --primary-color: #0066cc;
            --secondary-color: #004999;
            --accent-color: #00a8e8;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }
        
        .navbar {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        
        .hero {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            color: white;
            padding: 80px 0;
            margin-bottom: 50px;
        }
        
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 20px;
        }
        
        .hero p {
            font-size: 1.3rem;
            opacity: 0.95;
        }
        
        .module-card {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            border: none;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }
        
        .module-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 4px 16px rgba(0,0,0,0.15);
        }
        
        .module-card .card-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            font-weight: 600;
            font-size: 1.2rem;
        }
        
        .badge-version {
            background-color: var(--accent-color);
            font-size: 0.85rem;
            padding: 0.35rem 0.65rem;
        }
        
        .btn-primary {
            background: var(--primary-color);
            border: none;
        }
        
        .btn-primary:hover {
            background: var(--secondary-color);
        }
        
        footer {
            background-color: #f8f9fa;
            margin-top: 80px;
            padding: 30px 0;
            border-top: 1px solid #dee2e6;
        }
        
        .feature-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }