:root {
            --primary-color: #FF9933;
            --secondary-color: #138808;
            --accent-color: #000080;
            --text-color: #333333;
            --light-bg: #FFF9F0;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: #ffffff;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        .nav-link {
            font-weight: 500;
            transition: all 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        h1, h2, h3 {
            color: var(--accent-color);
            margin-bottom: 1.2rem;
            font-weight: 700;
        }
        h1 {
            border-bottom: 3px solid var(--primary-color);
            padding-bottom: 0.5rem;
            font-size: 2.5rem;
        }
        h2 {
            border-left: 5px solid var(--secondary-color);
            padding-left: 1rem;
            margin-top: 2.5rem;
            font-size: 2rem;
        }
        h3 {
            color: var(--primary-color);
            font-size: 1.5rem;
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight {
            background-color: var(--light-bg);
            border-left: 4px solid var(--primary-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .key-term {
            font-weight: 700;
            color: var(--accent-color);
        }
        .game-feature {
            background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
            border-radius: 10px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
        }
        .game-feature:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
            margin: 1.5rem 0;
        }
        img:hover {
            transform: scale(1.02);
        }
        .table-of-contents {
            background-color: var(--light-bg);
            border-radius: 10px;
            padding: 2rem;
            margin: 2rem 0;
        }
        .toc-list {
            list-style-type: none;
            padding-left: 0;
        }
        .toc-list li {
            margin-bottom: 0.8rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .toc-list li:before {
            content: "▸";
            color: var(--primary-color);
            position: absolute;
            left: 0;
        }
        .toc-list a {
            text-decoration: none;
            color: var(--text-color);
            transition: color 0.3s ease;
        }
        .toc-list a:hover {
            color: var(--primary-color);
        }
        footer {
            background-color: var(--accent-color);
            color: white;
            padding: 3rem 0 2rem;
            margin-top: 4rem;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.2);
            padding-top: 1.5rem;
            margin-top: 2rem;
            text-align: center;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }
        .cultural-note {
            background-color: #E8F5E9;
            border: 1px solid #C8E6C9;
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }
        .strategy-tip {
            background-color: #E3F2FD;
            border: 1px solid #BBDEFB;
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }
        .rule-item {
            margin-bottom: 1rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .rule-item:before {
            content: "•";
            color: var(--primary-color);
            font-weight: bold;
            position: absolute;
            left: 0;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-primary:hover {
            background-color: #e6891e;
            border-color: #e6891e;
        }