:root {
            --primary-color: #8B4513;
            --secondary-color: #CD853F;
            --accent-color: #D2691E;
            --text-dark: #2F4F4F;
            --text-light: #696969;
            --bg-light: #FFF8DC;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            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(rgba(139, 69, 19, 0.8), rgba(205, 133, 63, 0.7)), url('https://via.placeholder.com/1600x900') center/cover no-repeat;
            color: white;
            padding: 100px 0;
            text-align: center;
        }
        .section-title {
            color: var(--primary-color);
            border-left: 5px solid var(--accent-color);
            padding-left: 15px;
            margin: 40px 0 25px;
        }
        .content-card {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 25px;
            margin-bottom: 30px;
            transition: transform 0.3s ease;
        }
        .content-card:hover {
            transform: translateY(-5px);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--accent-color);
            margin-bottom: 15px;
        }
        .img-fluid {
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        .highlight {
            background-color: var(--bg-light);
            border-left: 4px solid var(--accent-color);
            padding: 20px;
            margin: 25px 0;
            font-style: italic;
        }
        .table-of-contents {
            background-color: #f8f9fa;
            border-radius: 8px;
            padding: 20px;
            margin: 30px 0;
        }
        .table-of-contents ul {
            list-style-type: none;
            padding-left: 0;
        }
        .table-of-contents li {
            margin-bottom: 10px;
        }
        .table-of-contents a {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.3s;
        }
        .table-of-contents a:hover {
            color: var(--accent-color);
        }
        footer {
            background-color: var(--text-dark);
            color: white;
            padding: 40px 0 20px;
        }
        .back-to-top {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: var(--accent-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: opacity 0.3s;
            z-index: 1000;
        }
        .back-to-top.show {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 60px 0;
            }
            .content-card {
                padding: 15px;
            }
        }