:root {
            --primary-blue: #1a5276;
            --secondary-teal: #16a085;
            --accent-orange: #e67e22;
            --deep-ocean: #154360;
            --coral: #e74c3c;
        }
        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;
            background: linear-gradient(45deg, var(--primary-blue), var(--secondary-teal));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .nav-link {
            font-weight: 600;
            transition: all 0.3s ease;
            border-radius: 5px;
            margin: 0 5px;
        }
        .nav-link:hover {
            background-color: rgba(26, 82, 118, 0.1);
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(22, 160, 133, 0.8), rgba(26, 82, 118, 0.9)), url('https://via.placeholder.com/1600x900') center/cover no-repeat;
            color: white;
            padding: 100px 0;
            text-align: center;
            border-radius: 0 0 30px 30px;
            margin-bottom: 40px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }
        h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 20px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        h2 {
            color: var(--primary-blue);
            border-left: 5px solid var(--accent-orange);
            padding-left: 15px;
            margin: 40px 0 20px;
            font-weight: 700;
        }
        h3 {
            color: var(--secondary-teal);
            margin: 30px 0 15px;
            font-weight: 600;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            padding: 40px;
            box-shadow: 0 5px 25px rgba(0,0,0,0.08);
            margin-bottom: 30px;
        }
        .highlight-box {
            background: linear-gradient(135deg, #e8f4f8, #d1e7f5);
            border-left: 4px solid var(--primary-blue);
            padding: 20px;
            border-radius: 0 10px 10px 0;
            margin: 25px 0;
        }
        .game-feature {
            background: white;
            border-radius: 10px;
            padding: 25px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            border-top: 4px solid var(--secondary-teal);
        }
        .game-feature:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--secondary-teal);
            margin-bottom: 15px;
        }
        img {
            border-radius: 10px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
            max-width: 100%;
            height: auto;
        }
        img:hover {
            transform: scale(1.02);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 10px;
            font-size: 0.9rem;
        }
        .fact-box {
            background: linear-gradient(135deg, var(--primary-blue), var(--deep-ocean));
            color: white;
            padding: 20px;
            border-radius: 10px;
            margin: 20px 0;
        }
        .table-of-contents {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 25px;
            margin: 30px 0;
            border-left: 5px solid var(--accent-orange);
        }
        .toc-list {
            list-style-type: none;
            padding-left: 0;
        }
        .toc-list li {
            margin-bottom: 10px;
            padding-left: 20px;
            position: relative;
        }
        .toc-list li:before {
            content: "▸";
            position: absolute;
            left: 0;
            color: var(--accent-orange);
        }
        .toc-list a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: color 0.3s ease;
            font-weight: 500;
        }
        .toc-list a:hover {
            color: var(--secondary-teal);
        }
        footer {
            background: linear-gradient(135deg, var(--deep-ocean), #0e2a3d);
            color: white;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 20px;
            margin-top: 30px;
            text-align: center;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 60px 0;
            }
            .content-section {
                padding: 25px;
            }
        }
        .keyword {
            font-weight: 700;
            color: var(--primary-blue);
        }
        .quote {
            font-style: italic;
            border-left: 3px solid var(--accent-orange);
            padding-left: 20px;
            margin: 25px 0;
            color: #555;
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--secondary-teal);
            display: block;
        }
        .stat-label {
            font-size: 1rem;
            color: #666;
        }