:root {
            --primary-color: #1e40af;
            --secondary-color: #dc2626;
            --accent-color: #16a34a;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --bg-light: #f8fafc;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--bg-light);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.1);
        }
        .hero-section {
            background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
            color: white;
            padding: 4rem 0;
            margin-bottom: 3rem;
            border-radius: 0 0 20px 20px;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 2.5rem;
            margin-bottom: 2rem;
        }
        h1, h2, h3 {
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        h1 {
            font-size: 2.5rem;
            text-align: center;
        }
        h2 {
            font-size: 2rem;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 0.5rem;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--secondary-color);
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fef3c7;
            padding: 1.5rem;
            border-left: 4px solid #f59e0b;
            border-radius: 0 8px 8px 0;
            margin: 1.5rem 0;
        }
        .game-feature {
            background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
            padding: 1.5rem;
            border-radius: 10px;
            margin: 1rem 0;
            transition: transform 0.3s ease;
        }
        .game-feature:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .img-container {
            text-align: center;
            margin: 2rem 0;
        }
        .game-img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }
        .game-img:hover {
            transform: scale(1.02);
        }
        .nav-pills .nav-link.active {
            background-color: var(--primary-color);
            font-weight: 600;
        }
        .nav-pills .nav-link {
            color: var(--text-dark);
        }
        footer {
            background-color: var(--text-dark);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .keyword-highlight {
            font-weight: 700;
            color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 2rem 0;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .content-section {
                padding: 1.5rem;
            }
        }
        .toc {
            background-color: #f8fafc;
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        .toc ul {
            padding-left: 1.5rem;
        }
        .toc li {
            margin-bottom: 0.5rem;
        }
        .toc a {
            color: var(--primary-color);
            text-decoration: none;
        }
        .toc a:hover {
            text-decoration: underline;
        }