:root {
            --primary-color: #ff6b35;
            --secondary-color: #f7931e;
            --accent-color: #8e44ad;
            --text-dark: #2c3e50;
            --text-light: #7f8c8d;
            --bg-light: #f8f9fa;
            --border-color: #e9ecef;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: #fff;
        }
        .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);
        }
        .navbar {
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark) !important;
            transition: color 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            color: white;
            padding: 4rem 0;
            margin-bottom: 3rem;
            border-radius: 0 0 20px 20px;
        }
        .hero-title {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 1rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .content-section {
            padding: 2rem 0;
        }
        h1, h2, h3 {
            color: var(--text-dark);
            margin-bottom: 1.5rem;
            font-weight: 700;
        }
        h1 {
            font-size: 2.5rem;
            border-bottom: 3px solid var(--primary-color);
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-color);
            margin-top: 2.5rem;
        }
        h3 {
            font-size: 1.5rem;
            color: var(--accent-color);
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight-box {
            background-color: var(--bg-light);
            border-left: 4px solid var(--primary-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .key-feature {
            background: linear-gradient(135deg, #fff 0%, var(--bg-light) 100%);
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        .key-feature:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .btn-primary-custom {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            border: none;
            color: white;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 4px 6px rgba(255, 107, 53, 0.3);
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(255, 107, 53, 0.4);
            color: white;
        }
        .btn-secondary-custom {
            background: transparent;
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .btn-secondary-custom:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .content-img {
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            margin: 2rem 0;
            transition: transform 0.3s ease;
            width: 100%;
            height: auto;
        }
        .content-img:hover {
            transform: scale(1.02);
        }
        .stats-section {
            background: linear-gradient(135deg, var(--accent-color) 0%, #9b59b6 100%);
            color: white;
            padding: 3rem 0;
            border-radius: 15px;
            margin: 3rem 0;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 0.5rem;
        }
        .stat-label {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        .tag {
            display: inline-block;
            background-color: var(--bg-light);
            color: var(--text-dark);
            padding: 0.5rem 1rem;
            border-radius: 50px;
            margin: 0.3rem;
            font-size: 0.9rem;
            transition: all 0.3s ease;
            text-decoration: none;
        }
        .tag:hover {
            background-color: var(--primary-color);
            color: white;
            text-decoration: none;
            transform: translateY(-2px);
        }
        footer {
            background-color: var(--text-dark);
            color: white;
            padding: 3rem 0 1rem;
            margin-top: 4rem;
        }
        .footer-heading {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        .footer-link {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s ease;
            display: block;
            margin-bottom: 0.5rem;
        }
        .footer-link:hover {
            color: var(--primary-color);
        }
        .copyright {
            border-top: 1px solid #34495e;
            padding-top: 1.5rem;
            margin-top: 2rem;
            text-align: center;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            .stat-number {
                font-size: 2.2rem;
            }
        }
        .toc {
            background-color: var(--bg-light);
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        .toc-title {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .toc-list {
            list-style-type: none;
            padding-left: 0;
        }
        .toc-item {
            margin-bottom: 0.7rem;
        }
        .toc-link {
            color: var(--text-dark);
            text-decoration: none;
            transition: color 0.3s ease;
            display: flex;
            align-items: center;
        }
        .toc-link:hover {
            color: var(--primary-color);
        }
        .toc-link::before {
            content: "▶";
            margin-right: 0.7rem;
            font-size: 0.7rem;
            color: var(--primary-color);
        }
        .review-card {
            background: white;
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            border: 1px solid var(--border-color);
        }
        .review-header {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
        }
        .review-avatar {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--primary-color);
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            margin-right: 1rem;
        }
        .review-stars {
            color: #f1c40f;
            margin-bottom: 0.5rem;
        }