:root {
            --primary-color: #2E8B57;
            --secondary-color: #FF6B35;
            --accent-color: #1E40AF;
            --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-color: var(--bg-light);
        }
        .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%, var(--accent-color) 100%);
            color: white;
            padding: 4rem 0;
            border-radius: 0 0 30px 30px;
            margin-bottom: 3rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 2rem;
            color: var(--primary-color);
            font-weight: 700;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .content-card {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            padding: 2rem;
            margin-bottom: 2rem;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
        }
        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.12);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 1rem;
        }
        .highlight-text {
            background: linear-gradient(120deg, rgba(46,139,87,0.1) 0%, rgba(255,107,53,0.1) 100%);
            border-left: 4px solid var(--secondary-color);
            padding: 1.5rem;
            border-radius: 0 10px 10px 0;
            margin: 2rem 0;
        }
        .game-image {
            border-radius: 12px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            transition: transform 0.4s ease;
            margin-bottom: 1.5rem;
        }
        .game-image:hover {
            transform: scale(1.02);
        }
        .keyword-badge {
            background: var(--primary-color);
            color: white;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            margin: 0 0.3rem 0.5rem 0;
            display: inline-block;
        }
        footer {
            background: var(--text-dark);
            color: white;
            padding: 3rem 0 2rem;
            margin-top: 4rem;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 2.5rem 0;
                border-radius: 0 0 20px 20px;
            }
            .content-card {
                padding: 1.5rem;
            }
            .navbar-brand {
                font-size: 1.5rem;
            }
        }
        .toc-item {
            padding: 0.7rem 1rem;
            border-left: 3px solid transparent;
            transition: all 0.3s ease;
            margin-bottom: 0.5rem;
        }
        .toc-item:hover {
            border-left-color: var(--secondary-color);
            background: rgba(46,139,87,0.05);
            border-radius: 0 8px 8px 0;
        }
        .stats-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
        }
        .stats-label {
            font-size: 0.9rem;
            color: var(--text-light);
            text-transform: uppercase;
            letter-spacing: 1px;
        }