:root {
            --primary-color: #ff6b35;
            --secondary-color: #1e3a8a;
            --accent-color: #f59e0b;
            --text-color: #1f2937;
            --light-bg: #f8fafc;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: var(--light-bg);
        }
        .logo-text {
            font-family: 'Georgia', serif;
            font-weight: bold;
            font-size: 2rem;
            color: var(--primary-color);
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .nav-custom {
            background: linear-gradient(135deg, var(--secondary-color) 0%, #3730a3 100%);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .hero-section {
            background: linear-gradient(rgba(30, 58, 138, 0.8), rgba(30, 58, 138, 0.9)), url('https://via.placeholder.com/1200x600') center/cover no-repeat;
            color: white;
            padding: 4rem 0;
            margin-bottom: 2rem;
        }
        .content-section {
            background: white;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            padding: 2.5rem;
            margin-bottom: 2rem;
        }
        h1, h2, h3 {
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--primary-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            border-left: 5px solid var(--accent-color);
            padding-left: 1rem;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-top: 2rem;
        }
        .key-point {
            background-color: #fef3c7;
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .game-feature {
            background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%);
            padding: 1.5rem;
            border-radius: 10px;
            margin: 1rem 0;
            border: 1px solid #bae6fd;
        }
        .img-container {
            text-align: center;
            margin: 2.5rem 0;
        }
        .img-container img {
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            max-width: 100%;
            height: auto;
        }
        .caption {
            font-style: italic;
            color: #6b7280;
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .highlight {
            background-color: #fffbeb;
            padding: 0.25rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
            color: var(--primary-color);
        }
        .table-of-contents {
            background-color: #f8fafc;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2rem 0;
            border: 1px solid #e2e8f0;
        }
        .toc-list {
            list-style-type: none;
            padding-left: 0;
        }
        .toc-list li {
            margin-bottom: 0.75rem;
            padding-left: 1rem;
            border-left: 3px solid transparent;
            transition: all 0.3s ease;
        }
        .toc-list li:hover {
            border-left-color: var(--primary-color);
            padding-left: 1.5rem;
        }
        .toc-list a {
            text-decoration: none;
            color: var(--text-color);
            display: block;
            transition: color 0.3s ease;
        }
        .toc-list a:hover {
            color: var(--primary-color);
        }
        footer {
            background-color: var(--secondary-color);
            color: white;
            padding: 2.5rem 0;
            margin-top: 3rem;
        }
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            margin-right: 1.5rem;
            transition: color 0.3s ease;
        }
        .footer-links a:hover {
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 2.5rem 0;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.75rem;
            }
            .content-section {
                padding: 1.5rem;
            }
        }
        .icon-bullet {
            color: var(--primary-color);
            margin-right: 0.5rem;
        }
        .strategy-tip {
            background-color: #ecfdf5;
            border: 1px solid #a7f3d0;
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }
        .strategy-tip h4 {
            color: #065f46;
            margin-top: 0;
        }