: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);
            margin-top: 20px;
            margin-bottom: 20px;
            overflow: hidden;
        }
        .logo-text {
            font-family: 'Impact', 'Arial Black', sans-serif;
            font-size: 2.8rem;
            background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 3px 3px 0 rgba(0,0,0,0.1);
            letter-spacing: 2px;
        }
        .nav-custom {
            background: linear-gradient(90deg, #1a2a6c, #b21f1f, #fdbb2d);
            border-bottom: 5px solid var(--primary-color);
        }
        .nav-link {
            color: white !important;
            font-weight: 600;
            padding: 15px 20px !important;
            transition: all 0.3s ease;
            border-radius: 10px;
            margin: 0 5px;
        }
        .nav-link:hover {
            background: rgba(255,255,255,0.2);
            transform: translateY(-3px);
        }
        h1, h2, h3 {
            color: var(--text-dark);
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        h1 {
            font-size: 3rem;
            border-bottom: 5px solid var(--primary-color);
            padding-bottom: 15px;
            text-align: center;
            margin-top: 2rem;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary-color);
            border-left: 6px solid var(--secondary-color);
            padding-left: 20px;
            margin-top: 3rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--secondary-color);
            margin-top: 2.5rem;
        }
        p {
            margin-bottom: 1.8rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight-box {
            background: linear-gradient(135deg, #ffeaa7, #fab1a0);
            border-left: 6px solid var(--primary-color);
            padding: 25px;
            border-radius: 10px;
            margin: 30px 0;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        .game-feature {
            background: var(--bg-light);
            padding: 20px;
            border-radius: 15px;
            margin: 20px 0;
            transition: transform 0.3s ease;
            border: 2px solid transparent;
        }
        .game-feature:hover {
            transform: translateY(-10px);
            border-color: var(--accent-color);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        img {
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            transition: transform 0.5s ease;
            margin: 25px 0;
            width: 100%;
            height: auto;
        }
        img:hover {
            transform: scale(1.03);
        }
        .content-section {
            padding: 40px;
        }
        .key-point {
            background: linear-gradient(135deg, #74b9ff, #0984e3);
            color: white;
            padding: 15px 25px;
            border-radius: 50px;
            display: inline-block;
            margin: 10px 5px;
            font-weight: 600;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        footer {
            background: linear-gradient(90deg, #1a2a6c, #b21f1f);
            color: white;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.3);
            z-index: 1000;
            transition: all 0.3s ease;
            text-decoration: none;
        }
        .back-to-top:hover {
            transform: translateY(-5px);
            background: var(--secondary-color);
            color: white;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .logo-text {
                font-size: 2rem;
            }
            .content-section {
                padding: 20px;
            }
            .nav-link {
                padding: 10px 15px !important;
                margin: 5px 0;
            }
        }