:root {
            --primary-color: #ff6b35;
            --secondary-color: #f7931e;
            --accent-color: #2ecc71;
            --dark-color: #2c3e50;
            --light-color: #ecf0f1;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        .main-container {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            overflow: hidden;
            margin-top: 20px;
            margin-bottom: 20px;
        }
        .logo {
            font-family: 'Arial Black', Gadget, sans-serif;
            font-size: 2.2rem;
            color: var(--primary-color);
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
            transition: all 0.3s ease;
        }
        .logo:hover {
            transform: scale(1.05);
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color);
            transition: all 0.3s ease;
            border-radius: 5px;
            margin: 0 5px;
        }
        .nav-link:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-2px);
        }
        h1, h2, h3 {
            color: var(--dark-color);
            margin-top: 1.5rem;
            margin-bottom: 1rem;
        }
        h1 {
            border-bottom: 3px solid var(--primary-color);
            padding-bottom: 10px;
            font-size: 2.5rem;
        }
        h2 {
            border-left: 5px solid var(--secondary-color);
            padding-left: 15px;
            font-size: 2rem;
        }
        h3 {
            border-bottom: 2px dashed var(--accent-color);
            padding-bottom: 5px;
            font-size: 1.5rem;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 15px;
            border-radius: 8px;
            border-left: 4px solid #ffd600;
            margin: 15px 0;
        }
        .game-feature {
            background: linear-gradient(45deg, var(--light-color), white);
            border-radius: 10px;
            padding: 20px;
            margin: 15px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
        }
        .game-feature:hover {
            transform: translateY(-5px);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        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;
        }
        img:hover {
            transform: scale(1.02);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 10px;
        }
        .key-point {
            background-color: #e3f2fd;
            border-radius: 8px;
            padding: 12px 15px;
            margin: 10px 0;
            border-left: 4px solid #2196f3;
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 30px 0;
            margin-top: 40px;
        }
        .back-to-top {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background-color: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.5rem;
            box-shadow: 0 3px 10px rgba(0,0,0,0.2);
            cursor: pointer;
            z-index: 1000;
            transition: all 0.3s ease;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .logo {
                font-size: 1.8rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            h3 {
                font-size: 1.3rem;
            }
        }