:root {
            --primary-color: #ff6b35;
            --secondary-color: #1e3a8a;
            --accent-color: #f59e0b;
            --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: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        .main-container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
            overflow: hidden;
            margin-top: 2rem;
            margin-bottom: 2rem;
        }
        .logo-text {
            font-family: 'Arial Black', Gadget, sans-serif;
            font-size: 2.2rem;
            background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 2px;
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark) !important;
            transition: all 0.3s ease;
            border-bottom: 3px solid transparent;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
            border-bottom: 3px solid var(--primary-color);
        }
        h1, h2, h3 {
            font-weight: 800;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        h1 {
            font-size: 3rem;
            border-left: 8px solid var(--primary-color);
            padding-left: 1.5rem;
            margin-top: 2rem;
        }
        h2 {
            font-size: 2.2rem;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 0.5rem;
            margin-top: 3rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--primary-color);
            margin-top: 2.5rem;
        }
        p {
            margin-bottom: 1.8rem;
            font-size: 1.1rem;
        }
        .highlight-box {
            background: linear-gradient(135deg, var(--bg-light), #e2e8f0);
            border-left: 6px solid var(--primary-color);
            padding: 2rem;
            border-radius: 0 15px 15px 0;
            margin: 2.5rem 0;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .key-point {
            background: var(--secondary-color);
            color: white;
            padding: 1rem 1.5rem;
            border-radius: 10px;
            margin: 1.5rem 0;
            font-weight: 600;
        }
        .game-image {
            border-radius: 15px;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease;
            margin: 2rem 0;
        }
        .game-image:hover {
            transform: scale(1.02);
        }
        .icon-feature {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .feature-card {
            background: white;
            border-radius: 15px;
            padding: 2rem;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            height: 100%;
            border: 1px solid #e2e8f0;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
        }
        footer {
            background: var(--secondary-color);
            color: white;
            padding: 3rem 0;
            margin-top: 4rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.5rem;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .logo-text {
                font-size: 1.8rem;
            }
        }