:root {
            --primary-color: #ff6b35;
            --secondary-color: #1a1a2e;
            --accent-color: #f7931e;
            --text-light: #ffffff;
            --text-dark: #333333;
            --bg-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
        }
        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 3px rgba(0,0,0,0.3);
        }
        .hero-section {
            background: var(--bg-gradient);
            color: var(--text-light);
            padding: 4rem 0;
            margin-bottom: 2rem;
            border-bottom: 5px solid var(--primary-color);
        }
        .content-section {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            padding: 2rem;
            margin-bottom: 2rem;
        }
        h1, h2, h3 {
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        h1 {
            color: var(--text-light);
            font-size: 2.8rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        h2 {
            border-left: 5px solid var(--primary-color);
            padding-left: 15px;
            margin-top: 2.5rem;
        }
        h3 {
            color: var(--accent-color);
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fff9e6;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .key-point {
            font-weight: 700;
            color: var(--primary-color);
        }
        .game-feature {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1rem 0;
            border-left: 4px solid var(--primary-color);
        }
        .img-container {
            text-align: center;
            margin: 2rem 0;
        }
        .img-container img {
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            max-width: 100%;
            height: auto;
        }
        .caption {
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .nav-pills .nav-link.active {
            background-color: var(--primary-color);
            font-weight: 600;
        }
        .nav-pills .nav-link {
            color: var(--secondary-color);
        }
        footer {
            background: var(--secondary-color);
            color: var(--text-light);
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 1rem;
            margin-top: 1rem;
            text-align: center;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            .hero-section {
                padding: 2rem 0;
            }
            .content-section {
                padding: 1.5rem;
            }
        }
        .toc {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 1.5rem;
            margin-bottom: 2rem;
            border-left: 4px solid var(--accent-color);
        }
        .toc ul {
            padding-left: 1.5rem;
        }
        .toc li {
            margin-bottom: 0.5rem;
        }
        .toc a {
            color: var(--secondary-color);
            text-decoration: none;
        }
        .toc a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }