:root {
            --primary-green: #2e7d32;
            --forest-dark: #1b5e20;
            --accent-gold: #ffd700;
            --earth-brown: #8d6e63;
            --sky-blue: #4fc3f7;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f5f5 0%, #e8f5e8 100%);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-green) !important;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .hero-section {
            background: linear-gradient(rgba(30, 87, 35, 0.8), rgba(30, 87, 35, 0.9)), url('https://via.placeholder.com/1200x600') center/cover;
            color: white;
            padding: 4rem 0;
            border-radius: 0 0 30px 30px;
            margin-bottom: 2rem;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            padding: 2.5rem;
            margin-bottom: 2rem;
        }
        h1, h2, h3 {
            color: var(--forest-dark);
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        h1 {
            font-size: 2.8rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }
        h2 {
            border-left: 5px solid var(--accent-gold);
            padding-left: 1rem;
            margin-top: 2.5rem;
        }
        h3 {
            color: var(--primary-green);
            margin-top: 2rem;
        }
        .key-point {
            background: #e8f5e9;
            border-left: 4px solid var(--primary-green);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .game-feature {
            background: linear-gradient(135deg, #f1f8e9, #e8f5e9);
            border-radius: 12px;
            padding: 1.5rem;
            margin: 1rem 0;
            transition: transform 0.3s ease;
        }
        .game-feature:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-green);
            margin-bottom: 1rem;
        }
        img {
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            margin: 2rem 0;
            max-width: 100%;
            height: auto;
        }
        .nav-pills .nav-link.active {
            background-color: var(--primary-green);
            font-weight: 600;
        }
        .nav-pills .nav-link {
            color: var(--forest-dark);
            margin: 0.2rem;
        }
        footer {
            background: var(--forest-dark);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
            border-radius: 30px 30px 0 0;
        }
        .highlight {
            background: linear-gradient(120deg, var(--accent-gold) 0%, var(--accent-gold) 100%);
            background-repeat: no-repeat;
            background-size: 100% 0.4em;
            background-position: 0 88%;
            font-weight: 700;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 2rem 0;
                border-radius: 0 0 20px 20px;
            }
            h1 {
                font-size: 2.2rem;
            }
            .content-section {
                padding: 1.5rem;
            }
        }
        .toc {
            background: #f8f9fa;
            border-radius: 12px;
            padding: 1.5rem;
            margin-bottom: 2rem;
            border-left: 4px solid var(--accent-gold);
        }
        .toc ul {
            padding-left: 1.5rem;
        }
        .toc li {
            margin-bottom: 0.7rem;
        }
        .toc a {
            color: var(--forest-dark);
            text-decoration: none;
            transition: color 0.3s;
        }
        .toc a:hover {
            color: var(--primary-green);
            text-decoration: underline;
        }