:root {
            --primary-color: #ff6b35;
            --secondary-color: #f7931e;
            --accent-color: #2e3192;
            --text-dark: #2d3748;
            --text-light: #4a5568;
            --bg-light: #f8f9fa;
            --border-radius: 8px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: #fff;
        }
        .logo-text {
            font-family: 'Georgia', serif;
            font-weight: bold;
            font-size: 1.8rem;
            color: var(--primary-color);
            text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
        }
        .nav-link {
            font-weight: 500;
            transition: color 0.3s ease;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 4rem 0;
            border-radius: 0 0 30px 30px;
            margin-bottom: 3rem;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 25px;
            color: var(--accent-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .content-card {
            background: white;
            border-radius: var(--border-radius);
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            padding: 2rem;
            margin-bottom: 2rem;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: 1px solid rgba(0,0,0,0.05);
        }
        .content-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .img-placeholder {
            background-color: #e9ecef;
            border-radius: var(--border-radius);
            display: flex;
            align-items: center;
            justify-content: center;
            height: 300px;
            margin: 1.5rem 0;
            overflow: hidden;
        }
        .img-placeholder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .highlight-text {
            background: linear-gradient(120deg, rgba(255,107,53,0.1) 0%, rgba(247,147,30,0.1) 100%);
            border-left: 4px solid var(--primary-color);
            padding: 1.5rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin: 2rem 0;
        }
        .key-feature {
            display: flex;
            align-items: flex-start;
            margin-bottom: 1.5rem;
        }
        .key-feature i {
            color: var(--primary-color);
            margin-right: 15px;
            margin-top: 5px;
            font-size: 1.2rem;
        }
        .table-of-contents {
            background-color: var(--bg-light);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            margin-bottom: 2rem;
        }
        .table-of-contents ul {
            list-style-type: none;
            padding-left: 0;
        }
        .table-of-contents li {
            margin-bottom: 0.8rem;
            padding-left: 1rem;
            position: relative;
        }
        .table-of-contents li:before {
            content: '▶';
            position: absolute;
            left: 0;
            color: var(--primary-color);
            font-size: 0.8rem;
        }
        .table-of-contents a {
            text-decoration: none;
            color: var(--text-dark);
            transition: color 0.3s ease;
        }
        .table-of-contents a:hover {
            color: var(--primary-color);
        }
        footer {
            background-color: var(--text-dark);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 20px;
            right: 20px;
            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 3px 10px rgba(0,0,0,0.2);
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 2.5rem 0;
                border-radius: 0 0 20px 20px;
            }
            .content-card {
                padding: 1.5rem;
            }
            .logo-text {
                font-size: 1.5rem;
            }
        }