:root {
            --primary-color: #8e44ad;
            --secondary-color: #f39c12;
            --accent-color: #e74c3c;
            --text-dark: #2c3e50;
            --text-light: #7f8c8d;
            --bg-light: #ecf0f1;
            --border-radius: 8px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: #f8f9fa;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark) !important;
            transition: color 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), #9b59b6);
            color: white;
            padding: 4rem 0;
            border-radius: 0 0 var(--border-radius) var(--border-radius);
            margin-bottom: 2rem;
        }
        .section-title {
            color: var(--primary-color);
            border-left: 4px solid var(--secondary-color);
            padding-left: 1rem;
            margin: 2rem 0 1.5rem;
        }
        .content-card {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        }
        .highlight {
            background-color: rgba(243, 156, 18, 0.1);
            border-left: 4px solid var(--secondary-color);
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .game-feature {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
        }
        .feature-icon {
            background-color: var(--primary-color);
            color: white;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            flex-shrink: 0;
        }
        .img-fluid {
            border-radius: var(--border-radius);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            margin: 1.5rem 0;
        }
        .table-of-contents {
            background-color: var(--bg-light);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        .toc-list {
            list-style-type: none;
            padding-left: 0;
        }
        .toc-list li {
            margin-bottom: 0.5rem;
            padding-left: 1rem;
            position: relative;
        }
        .toc-list li:before {
            content: "▶";
            color: var(--primary-color);
            position: absolute;
            left: 0;
        }
        .toc-list a {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .toc-list a:hover {
            color: var(--primary-color);
        }
        footer {
            background-color: var(--text-dark);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .keyword-highlight {
            font-weight: 700;
            color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 2rem 0;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }