:root {
            --primary-color: #d4af37;
            --secondary-color: #ff6b35;
            --accent-color: #2e8b57;
            --dark-color: #2c3e50;
            --light-color: #f8f9fa;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .hero-section {
            background: linear-gradient(rgba(44, 62, 80, 0.8), rgba(44, 62, 80, 0.9)), url('https://via.placeholder.com/1600x900') center/cover no-repeat;
            color: white;
            padding: 100px 0;
            text-align: center;
            margin-bottom: 40px;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            padding: 40px;
            margin-bottom: 30px;
        }
        h1, h2, h3 {
            color: var(--dark-color);
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        h1 {
            color: var(--primary-color);
            font-size: 2.8rem;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
        }
        h2 {
            border-left: 5px solid var(--secondary-color);
            padding-left: 15px;
            margin-top: 2.5rem;
        }
        h3 {
            color: var(--accent-color);
            margin-top: 2rem;
        }
        .highlight {
            background-color: rgba(212, 175, 55, 0.1);
            border-left: 4px solid var(--primary-color);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .game-feature {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            margin-bottom: 20px;
        }
        .game-feature:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .img-fluid {
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin: 25px 0;
        }
        .table-of-contents {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 30px;
        }
        .table-of-contents a {
            color: white;
            text-decoration: none;
            display: block;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255,255,255,0.2);
            transition: padding-left 0.3s;
        }
        .table-of-contents a:hover {
            padding-left: 10px;
            background-color: rgba(255,255,255,0.1);
        }
        .key-term {
            font-weight: 700;
            color: var(--secondary-color);
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 60px 0;
            }
            h1 {
                font-size: 2.2rem;
            }
            .content-section {
                padding: 25px;
            }
        }