body {
        margin: 0;
        font-family: 'Roboto', 'Open Sans', sans-serif;
        background: linear-gradient(135deg, #0a1f3d, #1e3a5f);
        color: #fff;
        line-height: 1.6;
    }

    header {
        text-align: center;
        padding: 40px 20px;
        background: linear-gradient(135deg, #000000, #1e3a5f);
        position: relative;
        overflow: hidden;
    }

    header::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 200%;
        height: 100%;
        background: url('https://images.gptkong.com/demo/sample1.png') repeat-x;
        animation: scrollBackground 20s linear infinite;
        opacity: 0.2;
    }

    @keyframes scrollBackground {
        0% { transform: translateX(0); }
        100% { transform: translateX(-50%); }
    }

    header h1 {
        font-size: 2.5rem;
        margin: 0;
        color: #fff;
        text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    }

    header p {
        font-size: 1rem;
        margin: 10px 0 0;
        color: #cfd8dc;
    }

    .container {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
        padding: 20px;
        max-width: 1400px;
        margin: 0 auto;
    }

    .card {
        background: linear-gradient(135deg, #1e3a5f, #0a1f3d);
        border-radius: 10px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
        padding: 20px;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .card:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    }

    .card img {
        width: 100%;
        height: auto;
        border-radius: 10px;
        margin-bottom: 15px;
    }

    .card h3 {
        font-size: 1.25rem;
        margin: 0 0 10px;
        color: #e3f2fd;
    }

    .card p {
        font-size: 0.9rem;
        color: #b0bec5;
    }

    pre {
        background: #0a1f3d;
        padding: 15px;
        border-radius: 5px;
        overflow-x: auto;
        font-size: 0.9rem;
        color: #bbdefb;
    }

    code {
        background: rgba(255, 255, 255, 0.1);
        padding: 2px 5px;
        border-radius: 3px;
    }

    button {
        background-color: #007BFF;
        color: white;
        border: none;
        padding: 10px 20px;
        border-radius: 5px;
        cursor: pointer;
        transition: background-color 0.3s ease;
        font-size: 0.9rem;
    }

    button:hover {
        background-color: #0056b3;
    }

    footer {
        text-align: center;
        padding: 20px;
        background: linear-gradient(135deg, #1e3a5f, #0a1f3d);
        color: #cfd8dc;
        font-size: 0.9rem;
    }

    @media (max-width: 768px) {
        header h1 {
            font-size: 2rem;
        }

        .container {
            grid-template-columns: 1fr;
        }

        pre {
            font-size: 0.8rem;
        }
    }

    @media (max-width: 480px) {
        header h1 {
            font-size: 1.75rem;
        }

        button {
            font-size: 0.8rem;
        }
    }