: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, #f8fafc 0%, #e2e8f0 100%);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .hero-section {
            background: linear-gradient(rgba(30, 58, 138, 0.8), rgba(245, 158, 11, 0.8)), url('https://via.placeholder.com/1200x600') center/cover no-repeat;
            color: white;
            padding: 5rem 0;
            border-radius: 0 0 30px 30px;
            margin-bottom: 3rem;
        }
        .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);
        }
        h1, h2, h3 {
            color: var(--secondary-color);
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        h1 {
            font-size: 2.8rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }
        h2 {
            font-size: 2.2rem;
            border-left: 5px solid var(--primary-color);
            padding-left: 1rem;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--primary-color);
            margin-top: 2rem;
        }
        .highlight {
            background: linear-gradient(120deg, #fef3c7 0%, #fef3c7 100%);
            padding: 1.5rem;
            border-radius: 10px;
            border-left: 4px solid var(--accent-color);
            margin: 1.5rem 0;
        }
        .key-feature {
            background: var(--bg-light);
            padding: 1.5rem;
            border-radius: 10px;
            margin: 1rem 0;
            transition: all 0.3s ease;
        }
        .key-feature:hover {
            background: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        img {
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin: 1.5rem 0;
            transition: transform 0.3s ease;
        }
        img:hover {
            transform: scale(1.02);
        }
        .table-of-contents {
            background: linear-gradient(135deg, #1e3a8a, #3730a3);
            color: white;
            border-radius: 15px;
            padding: 2rem;
            margin: 2rem 0;
        }
        .toc-list {
            list-style-type: none;
            padding: 0;
        }
        .toc-list li {
            margin: 0.8rem 0;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .toc-list li:hover {
            background: rgba(255,255,255,0.1);
            transform: translateX(5px);
        }
        .toc-list a {
            color: white;
            text-decoration: none;
            font-weight: 500;
        }
        footer {
            background: var(--secondary-color);
            color: white;
            padding: 3rem 0;
            margin-top: 4rem;
        }
        .copyright {
            background: #1e293b;
            color: #cbd5e1;
            padding: 1.5rem 0;
            text-align: center;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 3rem 0;
                border-radius: 0 0 20px 20px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .content-section {
                padding: 1.5rem;
            }
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-color);
        }
        .stat-label {
            font-size: 1rem;
            color: var(--text-light);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .gameplay-tip {
            background: linear-gradient(45deg, #dcfce7, #bbf7d0);
            border-radius: 10px;
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-left: 4px solid #16a34a;
        }