body {
    margin: 0;
    font-family: 'Lato', sans-serif;
    background: linear-gradient(to bottom, #1e3c72, #2a5298);
    color: #ffffff;
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    text-align: center;
    padding: 50px 20px;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover, linear-gradient(to right, #1e3c72, #2a5298);
    position: relative;
    overflow: hidden;
}

header h1 {
    font-family: 'Roboto', sans-serif;
    font-size: 48px;
    font-weight: bold;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

header p {
    font-size: 20px;
    margin-top: 10px;
    opacity: 0.8;
}

.card-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding: 20px;
    gap: 20px;
    background-color: #f5f5f5;
    color: #333;
}

.card {
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 300px;
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
    overflow: hidden;
    position: relative;
}

.card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.2);
}

.card img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-bottom: 1px solid #ddd;
}

.card-content {
    padding: 15px;
}

.card h3 {
    font-family: 'Roboto', sans-serif;
    font-size: 20px;
    margin: 0 0 10px;
    color: #1e3c72;
}

.card p {
    font-size: 14px;
    margin: 0 0 10px;
    color: #555;
}

.card a {
    display: inline-block;
    background: linear-gradient(to right, #4caf50, #8bc34a);
    color: #fff;
    padding: 10px 15px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: background 0.3s ease-in-out;
}

.card a:hover {
    background: linear-gradient(to right, #388e3c, #689f38);
}

@media (min-width: 768px) {
    .card {
        width: calc(50% - 20px);
    }
}

@media (min-width: 1024px) {
    .card {
        width: calc(33.33% - 20px);
    }
}

footer {
    text-align: center;
    padding: 20px;
    background: #1e3c72;
    color: #fff;
    font-size: 14px;
}

code {
    background: #f5f5f5;
    color: #333;
    padding: 5px;
    border-radius: 3px;
    font-family: monospace;
    display: block;
    white-space: pre-wrap;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: #fff;
    color: #333;
}

table th, table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

table th {
    background: #f0f0f0;
}

.page-transition {
    animation: fadeIn 0.5s ease-in-out;
}

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