:root {
            --primary-color: #1a5276;
            --secondary-color: #f39c12;
            --accent-color: #e74c3c;
            --text-color: #2c3e50;
            --light-bg: #ecf0f1;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: #f8f9fa;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        .nav-link {
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #2e86c1 100%);
            color: white;
            padding: 4rem 0;
            margin-bottom: 2rem;
            border-radius: 0 0 20px 20px;
        }
        h1, h2, h3 {
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        h1 {
            font-size: 2.5rem;
            font-weight: 800;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
        }
        h2 {
            font-size: 2rem;
            border-left: 5px solid var(--secondary-color);
            padding-left: 15px;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--accent-color);
            margin-top: 2rem;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 2.5rem;
            margin-bottom: 2rem;
        }
        .highlight-box {
            background-color: var(--light-bg);
            border-left: 4px solid var(--secondary-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-icon {
            font-size: 2rem;
            color: var(--secondary-color);
            margin-right: 15px;
        }
        .game-image {
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
            margin: 1.5rem 0;
        }
        .game-image:hover {
            transform: scale(1.02);
        }
        .key-point {
            background: linear-gradient(135deg, #ffeaa7 0%, #fab1a0 100%);
            padding: 1rem;
            border-radius: 10px;
            margin: 1rem 0;
            font-weight: 600;
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .strategy-card {
            transition: all 0.3s ease;
            border: none;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
            height: 100%;
        }
        .strategy-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.15);
        }
        .card-header {
            background-color: var(--primary-color);
            color: white;
            font-weight: 700;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .content-section {
                padding: 1.5rem;
            }
            .hero-section {
                padding: 2.5rem 0;
            }
        }
        .toc {
            background-color: var(--light-bg);
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        .toc ul {
            list-style-type: none;
            padding-left: 0;
        }
        .toc li {
            margin-bottom: 0.7rem;
        }
        .toc a {
            color: var(--primary-color);
            text-decoration: none;
            transition: all 0.2s ease;
            font-weight: 500;
        }
        .toc a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        strong {
            color: var(--accent-color);
        }