:root {
            --primary-color: #ff6b35;
            --secondary-color: #f7931e;
            --accent-color: #2ecc71;
            --text-dark: #2c3e50;
            --text-light: #7f8c8d;
            --bg-light: #f8f9fa;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        .main-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 15px 50px rgba(0,0,0,0.1);
            overflow: hidden;
            margin-top: 20px;
            margin-bottom: 20px;
        }
        .logo {
            font-family: 'Georgia', serif;
            font-weight: bold;
            font-size: 2.5rem;
            color: var(--primary-color);
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .logo span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark) !important;
            transition: all 0.3s ease;
            border-radius: 10px;
            margin: 0 5px;
        }
        .nav-link:hover {
            background-color: var(--primary-color);
            color: white !important;
            transform: translateY(-2px);
        }
        h1, h2, h3 {
            font-weight: 700;
            margin-bottom: 1.5rem;
            color: var(--text-dark);
        }
        h1 {
            font-size: 2.8rem;
            border-bottom: 3px solid var(--primary-color);
            padding-bottom: 10px;
            margin-top: 2rem;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--secondary-color);
            margin-top: 3rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--accent-color);
            margin-top: 2.5rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        .highlight {
            background-color: rgba(255, 107, 53, 0.1);
            padding: 15px;
            border-left: 4px solid var(--primary-color);
            border-radius: 5px;
            margin: 20px 0;
        }
        .game-feature {
            background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 15px;
            border-radius: 10px;
            margin: 15px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .img-container {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            margin: 30px 0;
            transition: transform 0.3s ease;
        }
        .img-container:hover {
            transform: scale(1.02);
        }
        footer {
            background-color: var(--text-dark);
            color: white;
            padding: 30px 0;
            margin-top: 50px;
        }
        .keyword {
            font-weight: bold;
            color: var(--primary-color);
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .logo {
                font-size: 1.8rem;
            }
        }
        .table-of-contents {
            background-color: var(--bg-light);
            border-radius: 15px;
            padding: 25px;
            margin: 30px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .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(--primary-color);
        }
        .toc-list a {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .toc-list a:hover {
            color: var(--primary-color);
        }
        blockquote {
            border-left: 5px solid var(--accent-color);
            padding-left: 20px;
            margin: 25px 0;
            font-style: italic;
            color: var(--text-light);
        }
        .icon-box {
            text-align: center;
            padding: 20px;
            border-radius: 10px;
            background-color: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
            height: 100%;
        }
        .icon-box:hover {
            transform: translateY(-5px);
        }
        .icon-box i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }