:root {
            --primary-color: #FF9933;
            --secondary-color: #138808;
            --accent-color: #000080;
            --text-dark: #333333;
            --text-light: #666666;
            --bg-light: #f8f9fa;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
        }
        .logo-text {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(45deg, var(--primary-color), var(--secondary-color), var(--accent-color));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }
        .nav-custom {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }
        .nav-custom.scrolled {
            background: rgba(255, 255, 255, 0.98);
            padding: 0.5rem 0;
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark) !important;
            transition: all 0.3s ease;
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--primary-color);
            transition: width 0.3s ease;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://via.placeholder.com/1600x900') center/cover no-repeat;
            color: white;
            padding: 120px 0 80px;
            text-align: center;
            margin-bottom: 40px;
        }
        .content-section {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            padding: 40px;
            margin-bottom: 40px;
        }
        h1 {
            color: var(--accent-color);
            font-weight: 800;
            margin-bottom: 25px;
            text-align: center;
            font-size: 2.8rem;
        }
        h2 {
            color: var(--primary-color);
            border-left: 5px solid var(--secondary-color);
            padding-left: 15px;
            margin: 40px 0 20px;
            font-weight: 700;
        }
        h3 {
            color: var(--secondary-color);
            margin: 30px 0 15px;
            font-weight: 600;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .highlight {
            background: linear-gradient(120deg, rgba(255, 153, 51, 0.2) 0%, rgba(19, 136, 8, 0.2) 100%);
            padding: 20px;
            border-radius: 10px;
            border-left: 4px solid var(--primary-color);
            margin: 25px 0;
        }
        .key-term {
            font-weight: 700;
            color: var(--accent-color);
        }
        .img-container {
            text-align: center;
            margin: 30px 0;
        }
        .img-fluid {
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease;
        }
        .img-fluid:hover {
            transform: scale(1.02);
        }
        .table-custom {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            margin: 30px 0;
        }
        .table-custom thead {
            background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
            color: white;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            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 4px 10px rgba(0, 0, 0, 0.2);
            transition: all 0.3s ease;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            transform: translateY(-5px);
        }
        footer {
            background: linear-gradient(45deg, var(--accent-color), #1a237e);
            color: white;
            padding: 40px 0 20px;
            margin-top: 60px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer-links a:hover {
            color: white;
            text-decoration: underline;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0 60px;
            }
            h1 {
                font-size: 2.2rem;
            }
            .content-section {
                padding: 25px;
            }
            .logo-text {
                font-size: 1.8rem;
            }
        }