* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
        font-family: 'Open Sans', sans-serif;
    }
    
    :root {
        --primary-color: #032B44;
        --secondary-color: #87CEEB;
        --white: #FFFFFF;
        --light-gray: #EAEAEA;
        --text-color: #333333;
        --accent-color: #1E5F7F;
        --gradient-blue: linear-gradient(135deg, #032B44 0%, #1E5F7F 50%, #87CEEB 100%);
    }
    
    body {
        background-color: var(--light-gray);
        color: var(--text-color);
        line-height: 1.6;
        overflow-x: hidden;
    }
    
    .header {
        background: var(--gradient-blue);
        color: var(--white);
        padding: 20px 0;
        position: sticky;
        top: 0;
        z-index: 1000;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    }
    
    .container {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
    }
    
    .header-content {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .logo {
        font-size: 24px;
        font-weight: bold;
        font-family: 'Montserrat', sans-serif;
        color: var(--white);
        text-decoration: none;
        display: flex;
        align-items: center;
    }
    
    .logo i {
        margin-right: 10px;
        font-size: 28px;
    }
    
    .nav {
        display: flex;
    }
    
    .nav-link {
        color: var(--white);
        text-decoration: none;
        margin-left: 20px;
        padding: 8px 12px;
        border-radius: 4px;
        transition: background-color 0.3s ease;
    }
    
    .nav-link:hover {
        background-color: rgba(255, 255, 255, 0.2);
    }
    
    .hero {
        background: var(--gradient-blue);
        color: var(--white);
        padding: 100px 0;
        text-align: center;
        position: relative;
        overflow: hidden;
    }
    
    .hero::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-image: url('https://images.gptkong.com/demo/sample1.png');
        background-size: cover;
        background-position: center;
        opacity: 0.15;
        z-index: 0;
    }
    
    .hero-content {
        position: relative;
        z-index: 1;
        max-width: 800px;
        margin: 0 auto;
    }
    
    .hero h1 {
        font-size: 42px;
        margin-bottom: 20px;
        font-family: 'Roboto Bold', sans-serif;
        text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    }
    
    .hero p {
        font-size: 18px;
        margin-bottom: 30px;
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .btn {
        display: inline-block;
        background-color: var(--secondary-color);
        color: var(--primary-color);
        padding: 12px 30px;
        border-radius: 30px;
        text-decoration: none;
        font-weight: bold;
        transition: all 0.3s ease;
        border: 2px solid transparent;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .btn:hover {
        background-color: var(--white);
        transform: translateY(-2px);
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    }
    
    .section {
        padding: 80px 0;
    }
    
    .section-title {
        text-align: center;
        margin-bottom: 60px;
        color: var(--primary-color);
        font-family: 'Roboto Bold', sans-serif;
        font-size: 32px;
        position: relative;
    }
    
    .section-title::after {
        content: '';
        position: absolute;
        bottom: -15px;
        left: 50%;
        width: 80px;
        height: 4px;
        background: var(--secondary-color);
        transform: translateX(-50%);
        border-radius: 2px;
    }
    
    .cards {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 30px;
        margin-top: 40px;
    }
    
    .card {
        background: var(--white);
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        flex: 1 1 300px;
        max-width: 350px;
    }
    
    .card:hover {
        transform: translateY(-10px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    }
    
    .card-img {
        width: 100%;
        height: 200px;
        object-fit: cover;
    }
    
    .card-content {
        padding: 25px;
    }
    
    .card h3 {
        color: var(--primary-color);
        margin-bottom: 15px;
        font-family: 'Montserrat', sans-serif;
        font-size: 20px;
    }
    
    .card p {
        color: var(--text-color);
        margin-bottom: 20px;
    }
    
    .features {
        background-color: var(--white);
    }
    
    .feature-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 30px;
    }
    
    .feature-item {
        padding: 30px;
        text-align: center;
        border-radius: 8px;
        transition: transform 0.3s ease;
    }
    
    .feature-item:hover {
        transform: scale(1.05);
    }
    
    .feature-icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 80px;
        height: 80px;
        margin-bottom: 20px;
        background: var(--gradient-blue);
        border-radius: 50%;
        color: var(--white);
        font-size: 36px;
    }
    
    .feature-item h3 {
        color: var(--primary-color);
        margin-bottom: 15px;
        font-family: 'Montserrat', sans-serif;
    }
    
    .article-section {
        background-color: var(--white);
        padding: 60px 0;
    }
    
    .article {
        max-width: 800px;
        margin: 0 auto;
        padding: 30px;
        background-color: var(--white);
        border-radius: 10px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }
    
    .article h2 {
        color: var(--primary-color);
        margin-bottom: 30px;
        font-family: 'Roboto Bold', sans-serif;
        font-size: 28px;
        line-height: 1.3;
    }
    
    .article h3 {
        color: var(--accent-color);
        margin: 25px 0 15px;
        font-family: 'Montserrat', sans-serif;
        font-size: 22px;
    }
    
    .article p {
        margin-bottom: 20px;
        line-height: 1.7;
    }
    
    .article pre {
        background-color: #f6f8fa;
        border-radius: 6px;
        padding: 15px;
        overflow-x: auto;
        margin: 20px 0;
    }
    
    .article code {
        font-family: 'Courier New', monospace;
        color: #032B44;
    }
    
    .article table {
        width: 100%;
        border-collapse: collapse;
        margin: 20px 0;
    }
    
    .article th, .article td {
        padding: 12px;
        border: 1px solid #ddd;
        text-align: left;
    }
    
    .article th {
        background-color: #f2f2f2;
        color: var(--primary-color);
    }
    
    .article tr:nth-child(even) {
        background-color: #f9f9f9;
    }
    
    .testimonials {
        background: var(--gradient-blue);
        color: var(--white);
        padding: 80px 0;
    }
    
    .testimonial-container {
        display: flex;
        overflow-x: hidden;
        position: relative;
    }
    
    .testimonial-slide {
        min-width: 100%;
        padding: 0 20px;
        text-align: center;
        opacity: 0;
        transition: opacity 0.5s ease;
    }
    
    .testimonial-slide.active {
        opacity: 1;
    }
    
    .testimonial-text {
        font-size: 18px;
        font-style: italic;
        max-width: 800px;
        margin: 0 auto 30px;
        line-height: 1.8;
    }
    
    .testimonial-author {
        font-weight: bold;
        font-size: 16px;
    }
    
    .cta-section {
        text-align: center;
        padding: 100px 0;
        background-color: var(--light-gray);
    }
    
    .cta-content {
        max-width: 700px;
        margin: 0 auto;
    }
    
    .cta-title {
        font-size: 36px;
        color: var(--primary-color);
        margin-bottom: 20px;
        font-family: 'Roboto Bold', sans-serif;
    }
    
    .cta-text {
        font-size: 18px;
        margin-bottom: 40px;
        color: var(--text-color);
    }
    
    .btn-large {
        padding: 15px 40px;
        font-size: 18px;
    }
    
    .footer {
        background-color: var(--primary-color);
        color: var(--white);
        padding: 60px 0 30px;
    }
    
    .footer-content {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 40px;
        margin-bottom: 40px;
    }
    
    .footer-column h3 {
        font-size: 20px;
        margin-bottom: 20px;
        font-family: 'Montserrat', sans-serif;
        position: relative;
        padding-bottom: 10px;
    }
    
    .footer-column h3::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 0;
        width: 50px;
        height: 3px;
        background-color: var(--secondary-color);
    }
    
    .footer-column p {
        margin-bottom: 15px;
        line-height: 1.7;
    }
    
    .footer-links a {
        display: block;
        color: var(--white);
        text-decoration: none;
        margin-bottom: 10px;
        transition: color 0.3s ease;
    }
    
    .footer-links a:hover {
        color: var(--secondary-color);
    }
    
    .copyright {
        text-align: center;
        padding-top: 30px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        font-size: 14px;
    }
    
    .disclaimer {
        background-color: #f8f9fa;
        padding: 10px 0;
        text-align: center;
        font-size: 14px;
        color: #6c757d;
    }
    
    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    .fade-in {
        animation: fadeIn 1s ease forwards;
    }
    
    .scroll-trigger {
        opacity: 1;
    }
    
    @media screen and (max-width: 768px) {
        .header-content {
            flex-direction: column;
            align-items: center;
        }
        
        .nav {
            margin-top: 20px;
            flex-wrap: wrap;
            justify-content: center;
        }
        
        .nav-link {
            margin: 5px;
        }
        
        .hero h1 {
            font-size: 32px;
        }
        
        .hero p {
            font-size: 16px;
        }
        
        .section-title {
            font-size: 28px;
        }
        
        .article h2 {
            font-size: 24px;
        }
        
        .article h3 {
            font-size: 20px;
        }
        
        .article pre {
            padding: 10px;
        }
        
        .article table {
            display: block;
            overflow-x: auto;
            white-space: nowrap;
        }
        
        .cta-title {
            font-size: 28px;
        }
        
        .cta-text {
            font-size: 16px;
        }
    }
    
    @media screen and (max-width: 480px) {
        .hero h1 {
            font-size: 28px;
        }
        
        .hero p {
            font-size: 14px;
        }
        
        .section {
            padding: 60px 0;
        }
        
        .card {
            max-width: 100%;
        }
        
        .card-content {
            padding: 20px;
        }
        
        .article {
            padding: 20px;
        }
        
        .btn-large {
            padding: 12px 30px;
            font-size: 16px;
        }
    }