body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background-color: #f4f6f9;
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(135deg, #007BFF, #6C757D);
    background-size: 200% 200%;
    animation: gradientAnimation 10s ease infinite;
    color: white;
    padding: 15px 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    z-index: 1000;
}
@keyframes gradientAnimation {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
header h1 {
    margin: 0;
    font-size: 24px;
    text-align: center;
}
.container {
    max-width: 1400px;
    margin: 100px auto 20px;
    padding: 0 20px;
}
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.card {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    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, 0.2);
}
.card img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    margin-bottom: 15px;
}
.card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #007BFF;
}
.card p {
    font-size: 14px;
    color: #555;
}
@media (max-width: 768px) {
    .grid-container {
        grid-template-columns: 1fr;
    }
    header h1 {
        font-size: 20px;
    }
}
.intro-section {
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover;
    color: white;
    text-align: center;
    padding: 100px 20px;
    margin-top: 60px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}
.intro-section h2 {
    font-size: 36px;
    margin-bottom: 20px;
}
.intro-section p {
    font-size: 18px;
    max-width: 800px;
    margin: 0 auto;
}
.button {
    display: inline-block;
    background-color: #ff6f61;
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-size: 16px;
    transition: background-color 0.3s ease, transform 0.3s ease;
}
.button:hover {
    background-color: #e05244;
    transform: scale(1.05);
}
.article-section {
    background-color: #fff;
    padding: 40px;
    border-radius: 10px;
    margin-top: 40px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
.article-section h2 {
    font-size: 28px;
    margin-bottom: 20px;
    color: #007BFF;
}
.article-section pre {
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 14px;
    color: #333;
}
.article-section code {
    color: #d400ff;
    font-weight: bold;
}
footer {
    background-color: #007BFF;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    font-size: 14px;
}
.footer-note {
    font-size: 12px;
    opacity: 0.8;
    margin-top: 10px;
}