:root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --accent-color: #e74c3c;
            --success-color: #2ecc71;
            --warning-color: #f39c12;
            --info-color: #1abc9c;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Roboto', sans-serif;
            color: #333;
            line-height: 1.6;
            background-color: #f8f9fa;
        }
        
        h1, h2, h3, h4, h5, h6 {
            font-family: 'Poppins', sans-serif;
            font-weight: 600;
        }
        
        .navbar {
            background: linear-gradient(135deg, var(--primary-color), #34495e);
            box-shadow: 0 2px 15px rgba(0,0,0,0.1);
        }
        
        .navbar-brand {
            font-family: 'Poppins', sans-serif;
            font-weight: 700;
        }
        
        .nav-link {
            font-weight: 500;
            transition: all 0.3s;
        }
        
        .nav-link:hover {
            color: var(--secondary-color) !important;
            transform: translateY(-2px);
        }
        
        /* Banner del Tema */
        .theme-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 4rem 0;
            margin-bottom: 2rem;
            position: relative;
            overflow: hidden;
        }
        
        .theme-header::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.1)"/></svg>');
            background-size: cover;
        }
        
        .theme-badge {
            background: rgba(255,255,255,0.2);
            padding: 0.5rem 1.5rem;
            border-radius: 50px;
            display: inline-block;
            margin-bottom: 1rem;
            font-size: 0.9rem;
        }
        
        .content-card {
            border: none;
            border-radius: 15px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.08);
            transition: transform 0.3s, box-shadow 0.3s;
            margin-bottom: 2rem;
            overflow: hidden;
        }
        
        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.12);
        }
        
        .card-header {
            background: linear-gradient(135deg, var(--primary-color), #3a506b);
            color: white;
            border: none;
            padding: 1.5rem;
        }
        
        .card-body {
            padding: 2rem;
        }
        
        .icon-list {
            list-style: none;
            padding-left: 0;
        }
        
        .icon-list li {
            padding: 0.5rem 0;
            display: flex;
            align-items: flex-start;
        }
        
        .icon-list i {
            color: var(--secondary-color);
            margin-right: 10px;
            margin-top: 3px;
            flex-shrink: 0;
        }
        
        .example-box {
            background: #f8f9fa;
            border-left: 4px solid var(--secondary-color);
            padding: 1.5rem;
            border-radius: 0 8px 8px 0;
            margin: 1.5rem 0;
        }
        
        .example-box h6 {
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .glossary-term {
            background: white;
            border: 1px solid #e9ecef;
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 1rem;
            transition: border-color 0.3s;
        }
        
        .glossary-term:hover {
            border-color: var(--secondary-color);
        }
        
        .material-card {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-radius: 15px;
            padding: 2rem;
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .material-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
        }
        
        .activity-card {
            background: linear-gradient(135deg, var(--success-color), #27ae60);
            color: white;
            border-radius: 15px;
            padding: 2rem;
        }
        
        .criteria-list {
            background: rgba(255,255,255,0.2);
            padding: 1.5rem;
            border-radius: 10px;
            margin-top: 1rem;
        }
        
        .info-sidebar {
            background: white;
            border-radius: 15px;
            padding: 2rem;
            box-shadow: 0 5px 20px rgba(0,0,0,0.08);
            position: sticky;
            top: 20px;
        }
        
        .info-item {
            display: flex;
            align-items: center;
            margin-bottom: 1.5rem;
            padding-bottom: 1.5rem;
            border-bottom: 1px solid #e9ecef;
        }
        
        .info-icon {
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            flex-shrink: 0;
        }
        
        footer {
            background: var(--primary-color);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        
        .social-icons a {
            color: white;
            font-size: 1.5rem;
            margin-right: 1rem;
            transition: color 0.3s;
        }
        
        .social-icons a:hover {
            color: var(--secondary-color);
        }
        
        @media (max-width: 768px) {
            .theme-header {
                padding: 3rem 0;
                text-align: center;
            }
            
            .theme-header h1 {
                font-size: 2rem;
            }
            
            .card-body {
                padding: 1.5rem;
            }
            
            .info-sidebar {
                position: static;
                margin-bottom: 2rem;
            }
        }
        
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .animate-fade {
            animation: fadeInUp 0.6s ease-out;
        }
        
        .code-block {
            background: #2d3748;
            color: #e2e8f0;
            padding: 1.5rem;
            border-radius: 8px;
            font-family: 'Courier New', monospace;
            margin: 1rem 0;
            overflow-x: auto;
        }