:root {
            --primary-color: #4a148c;
            --secondary-color: #ff6f00;
            --accent-color: #00bcd4;
            --text-dark: #2c3e50;
            --text-light: #7f8c8d;
            --bg-light: #f8f9fa;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: #ffffff;
        }
        .logo-text {
            font-family: 'Arial Black', Gadget, sans-serif;
            font-size: 2.2rem;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 1.5px;
        }
        .nav-custom {
            background: linear-gradient(135deg, var(--primary-color), #6a1b9a);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .nav-link {
            color: white !important;
            font-weight: 600;
            padding: 10px 20px !important;
            transition: all 0.3s ease;
            border-radius: 5px;
        }
        .nav-link:hover {
            background-color: rgba(255,255,255,0.15);
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(74, 20, 140, 0.85), rgba(106, 27, 154, 0.85)), 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(--secondary-color);
            padding-left: 15px;
            margin: 40px 0 25px;
            font-weight: 700;
        }
        .content-section {
            padding: 60px 0;
        }
        .highlight-box {
            background-color: var(--bg-light);
            border-left: 4px solid var(--secondary-color);
            padding: 25px;
            margin: 30px 0;
            border-radius: 0 8px 8px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .key-feature {
            background: white;
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 25px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
            border-top: 4px solid var(--accent-color);
        }
        .key-feature:hover {
            transform: translateY(-5px);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 15px;
        }
        .img-fluid {
            border-radius: 10px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            transition: transform 0.3s ease;
        }
        .img-fluid:hover {
            transform: scale(1.02);
        }
        .footer {
            background-color: var(--primary-color);
            color: white;
            padding: 40px 0 20px;
        }
        .footer-heading {
            color: var(--secondary-color);
            margin-bottom: 20px;
            font-weight: 700;
        }
        .copyright {
            background-color: rgba(0,0,0,0.2);
            padding: 15px 0;
            margin-top: 30px;
            text-align: center;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background-color: var(--secondary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            z-index: 1000;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .back-to-top.show {
            opacity: 1;
        }
        .table-of-contents {
            background-color: var(--bg-light);
            border-radius: 10px;
            padding: 25px;
            margin: 30px 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .toc-list {
            list-style-type: none;
            padding-left: 0;
        }
        .toc-list li {
            margin-bottom: 10px;
            padding-left: 20px;
            position: relative;
        }
        .toc-list li:before {
            content: "▸";
            position: absolute;
            left: 0;
            color: var(--secondary-color);
        }
        .toc-list a {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .toc-list a:hover {
            color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .logo-text {
                font-size: 1.8rem;
            }
            .hero-section {
                padding: 60px 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }