:root {
            --primary-color: #ff6b6b;
            --secondary-color: #4ecdc4;
            --accent-color: #ffd166;
            --dark-color: #2d3047;
            --light-color: #f7fff7;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 4rem 0;
            margin-bottom: 2rem;
            border-radius: 0 0 30px 30px;
        }
        .section-title {
            color: var(--dark-color);
            border-left: 5px solid var(--accent-color);
            padding-left: 15px;
            margin: 2rem 0 1.5rem;
        }
        .content-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 2rem;
            margin-bottom: 2rem;
            transition: transform 0.3s ease;
        }
        .content-card:hover {
            transform: translateY(-5px);
        }
        .game-feature {
            background: var(--light-color);
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            border-left: 4px solid var(--secondary-color);
        }
        .img-fluid {
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin: 1.5rem 0;
        }
        .highlight {
            background-color: var(--accent-color);
            padding: 0.2rem 0.5rem;
            border-radius: 5px;
            font-weight: 600;
        }
        .table-of-contents {
            background: white;
            border-radius: 15px;
            padding: 2rem;
            margin-bottom: 2rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .toc-item {
            margin-bottom: 0.8rem;
            padding-bottom: 0.8rem;
            border-bottom: 1px solid #eee;
        }
        .toc-item:last-child {
            border-bottom: none;
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 3rem 0;
            margin-top: 3rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
            z-index: 1000;
            opacity: 0;
            transition: opacity 0.3s;
        }
        .back-to-top.show {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 2rem 0;
                border-radius: 0 0 20px 20px;
            }
            .content-card {
                padding: 1.5rem;
            }
        }