:root {
            --primary-color: #ff6b35;
            --secondary-color: #1e3a8a;
            --accent-color: #f59e0b;
            --text-color: #334155;
            --light-bg: #f8fafc;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
        }
        .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;
            transition: all 0.3s ease;
            color: var(--secondary-color) !important;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        h1, h2, h3 {
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        h1 {
            font-size: 2.8rem;
            border-left: 5px solid var(--primary-color);
            padding-left: 1rem;
            margin-top: 2rem;
        }
        h2 {
            font-size: 2.2rem;
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 0.5rem;
            margin-top: 3rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--primary-color);
            margin-top: 2.5rem;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            padding: 2.5rem;
            margin-bottom: 2rem;
            transition: transform 0.3s ease;
        }
        .content-section:hover {
            transform: translateY(-5px);
        }
        .key-point {
            background: linear-gradient(135deg, #fff9db 0%, #ffec99 100%);
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .game-image {
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            transition: all 0.4s ease;
            margin: 2rem 0;
        }
        .game-image:hover {
            transform: scale(1.02);
            box-shadow: 0 12px 35px rgba(0,0,0,0.2);
        }
        .highlight-text {
            background: linear-gradient(120deg, var(--primary-color) 0%, var(--accent-color) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-weight: 700;
        }
        .strategy-card {
            background: var(--light-bg);
            border-radius: 12px;
            padding: 1.8rem;
            margin: 1.5rem 0;
            border: 1px solid #e2e8f0;
            transition: all 0.3s ease;
        }
        .strategy-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 5px 15px rgba(255,107,53,0.1);
        }
        footer {
            background: var(--secondary-color);
            color: white;
            padding: 3rem 0;
            margin-top: 4rem;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .content-section { padding: 1.5rem; }
        }
        .toc-item {
            padding: 0.8rem 1rem;
            border-radius: 8px;
            margin-bottom: 0.5rem;
            transition: all 0.3s ease;
            background: white;
            border-left: 3px solid transparent;
        }
        .toc-item:hover {
            background: var(--light-bg);
            border-left-color: var(--primary-color);
            transform: translateX(5px);
        }
        .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 4px 15px rgba(255,107,53,0.3);
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top:hover {
            transform: translateY(-5px);
            color: white;
            box-shadow: 0 6px 20px rgba(255,107,53,0.4);
        }