:root {
            --primary-color: #1a237e;
            --secondary-color: #ff6f00;
            --accent-color: #4caf50;
            --dark-bg: #0d1117;
            --light-text: #f5f5f5;
            --medium-gray: #37474f;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--dark-bg);
            color: var(--light-text);
            line-height: 1.7;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--secondary-color) !important;
            text-shadow: 0 0 10px rgba(255, 111, 0, 0.5);
        }
        .nav-link {
            color: var(--light-text) !important;
            font-weight: 500;
            transition: color 0.3s ease;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(13, 17, 23, 0.8), rgba(13, 17, 23, 0.9)), url('https://via.placeholder.com/1920x1080') center/cover no-repeat;
            padding: 100px 0;
            text-align: center;
        }
        .section-title {
            color: var(--secondary-color);
            border-bottom: 2px solid var(--secondary-color);
            padding-bottom: 10px;
            margin-bottom: 30px;
            font-weight: 700;
        }
        .content-section {
            padding: 60px 0;
        }
        .content-card {
            background-color: rgba(55, 71, 79, 0.3);
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 30px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
        }
        .highlight-text {
            color: var(--secondary-color);
            font-weight: 600;
        }
        .operator-card {
            text-align: center;
            padding: 20px;
            border-radius: 8px;
            background: rgba(26, 35, 126, 0.2);
            margin-bottom: 20px;
        }
        .operator-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 15px;
        }
        .gameplay-img {
            border-radius: 8px;
            width: 100%;
            height: auto;
            margin: 20px 0;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
        }
        footer {
            background-color: rgba(13, 17, 23, 0.9);
            padding: 40px 0 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }
        .footer-links a {
            color: var(--light-text);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer-links a:hover {
            color: var(--secondary-color);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            margin-top: 20px;
            text-align: center;
            color: rgba(255, 255, 255, 0.7);
        }
        .table-of-contents {
            background: rgba(55, 71, 79, 0.3);
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 40px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .toc-list {
            list-style-type: none;
            padding-left: 0;
        }
        .toc-list li {
            margin-bottom: 10px;
        }
        .toc-list a {
            color: var(--light-text);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .toc-list a:hover {
            color: var(--secondary-color);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 60px 0;
            }
            .content-section {
                padding: 40px 0;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }