:root {
            --primary-color: #8B4513;
            --secondary-color: #CD853F;
            --accent-color: #FFD700;
            --text-color: #2F4F4F;
            --light-bg: #FFF8DC;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-color);
            background-color: #f9f9f9;
        }
        .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);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 4rem 0;
            margin-bottom: 2rem;
            border-radius: 0 0 20px 20px;
        }
        .content-section {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 2rem;
            margin-bottom: 2rem;
        }
        h1, h2, h3 {
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            border-left: 5px solid var(--secondary-color);
            padding-left: 1rem;
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--secondary-color);
        }
        .key-feature {
            background-color: var(--light-bg);
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .img-container {
            text-align: center;
            margin: 2rem 0;
        }
        .img-container img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .caption {
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.9rem;
        }
        .nav-pills .nav-link.active {
            background-color: var(--primary-color);
        }
        .nav-pills .nav-link {
            color: var(--primary-color);
        }
        blockquote {
            border-left: 4px solid var(--secondary-color);
            padding-left: 1.5rem;
            margin: 1.5rem 0;
            font-style: italic;
            color: #555;
        }
        .table-of-contents {
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-radius: 10px;
            margin-bottom: 2rem;
        }
        .table-of-contents ul {
            list-style-type: none;
            padding-left: 0;
        }
        .table-of-contents li {
            margin-bottom: 0.5rem;
        }
        .table-of-contents a {
            color: var(--primary-color);
            text-decoration: none;
            transition: all 0.3s;
        }
        .table-of-contents a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .highlight {
            background-color: rgba(255, 215, 0, 0.2);
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 2rem 0;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
        }