body, html {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #1E1E2F, #0A0A1A);
    color: #FFFFFF;
    overflow-x: hidden;
}

header {
    position: relative;
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover, linear-gradient(135deg, #007BFF, #87CEEB);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
}

header h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 4rem;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
    animation: fadeIn 3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.card {
    background: linear-gradient(135deg, #1A237E, #03A9F4);
    border-radius: 10px;
    box-shadow: 0 6px 10px rgba(0, 0, 0, 0.2);
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    color: white;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

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

.article-section {
    background: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    margin-top: 40px;
}

.article-section h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.5rem;
    color: #FFFFFF;
    margin-bottom: 20px;
}

.article-section pre {
    background: rgba(0, 0, 0, 0.5);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-size: 0.9rem;
    color: #D3D3D3;
}

.article-section table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.article-section th, .article-section td {
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 10px;
    text-align: left;
}

.button {
    display: inline-block;
    padding: 10px 20px;
    background: linear-gradient(135deg, #007BFF, #87CEEB);
    color: white;
    border: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-top: 20px;
}

.button:hover {
    transform: scale(1.1);
    background: linear-gradient(135deg, #0056b3, #007BFF);
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2.5rem;
    }

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

    .card {
        padding: 15px;
    }

    .article-section pre {
        font-size: 0.8rem;
    }
}

.footer {
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, #0A0A1A, #1E1E2F);
    color: #D3D3D3;
    font-size: 0.9rem;
}