:root {
            --primary-color: #8B4513;
            --secondary-color: #FFD700;
            --accent-color: #228B22;
            --text-dark: #2C1810;
            --text-light: #F5F5DC;
            --bg-light: #FFF8DC;
        }
        body {
            font-family: 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background: linear-gradient(135deg, var(--bg-light) 0%, #FFFFFF 100%);
        }
        .logo-text {
            font-family: 'Georgia', serif;
            font-weight: bold;
            color: var(--primary-color);
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            font-size: 2.2rem;
        }
        .nav-custom {
            background: linear-gradient(90deg, var(--primary-color) 0%, #A0522D 100%);
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        .nav-link {
            color: var(--text-light) !important;
            font-weight: 500;
            transition: all 0.3s ease;
            padding: 0.8rem 1.2rem !important;
        }
        .nav-link:hover {
            background-color: rgba(255,255,255,0.1);
            border-radius: 8px;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(139, 69, 19, 0.8), rgba(34, 139, 34, 0.7)), url('https://via.placeholder.com/1200x600') center/cover no-repeat;
            color: white;
            padding: 5rem 0;
            margin-bottom: 3rem;
            border-radius: 0 0 30px 30px;
        }
        .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(--primary-color);
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        h1 {
            font-size: 2.8rem;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.2);
        }
        h2 {
            font-size: 2.2rem;
            border-left: 5px solid var(--secondary-color);
            padding-left: 1rem;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.8rem;
            color: var(--accent-color);
            margin-top: 2rem;
        }
        .keyword-highlight {
            background: linear-gradient(120deg, var(--secondary-color) 0%, var(--secondary-color) 100%);
            background-repeat: no-repeat;
            background-size: 100% 40%;
            background-position: 0 90%;
            font-weight: 700;
            padding: 0.1rem 0.3rem;
        }
        .feature-icon {
            color: var(--primary-color);
            margin-right: 0.8rem;
            font-size: 1.3rem;
        }
        .image-container {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            margin: 2rem 0;
            transition: transform 0.3s ease;
        }
        .image-container:hover {
            transform: scale(1.02);
        }
        .image-caption {
            background: var(--primary-color);
            color: white;
            padding: 0.8rem;
            text-align: center;
            font-style: italic;
        }
        .table-of-contents {
            background: linear-gradient(135deg, #F5F5DC 0%, #FFF8DC 100%);
            border-radius: 12px;
            padding: 2rem;
            margin: 2rem 0;
            border-left: 5px solid var(--accent-color);
        }
        .toc-list {
            list-style-type: none;
            padding-left: 0;
        }
        .toc-list li {
            margin-bottom: 0.8rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .toc-list li:before {
            content: "▸";
            color: var(--primary-color);
            position: absolute;
            left: 0;
            font-weight: bold;
        }
        .toc-list a {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .toc-list a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .strategy-box {
            background: linear-gradient(135deg, #E8F5E8 0%, #F0FFF0 100%);
            border: 2px solid var(--accent-color);
            border-radius: 12px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }
        .fact-box {
            background: linear-gradient(135deg, #FFF0DB 0%, #FFEBCD 100%);
            border-left: 5px solid var(--secondary-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 12px 12px 0;
        }
        footer {
            background: linear-gradient(90deg, var(--primary-color) 0%, #2C1810 100%);
            color: var(--text-light);
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-heading {
            color: var(--secondary-color);
            font-size: 1.3rem;
            margin-bottom: 1.2rem;
        }
        @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;
            }
            h3 {
                font-size: 1.5rem;
            }
            .content-section {
                padding: 1.5rem;
            }
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            box-shadow: 0 4px 12px rgba(0,0,0,0.3);
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            transform: translateY(-5px);
        }