body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #f4f9f2, #e8f3ff);
    color: #333333;
    line-height: 1.6;
    overflow-x: hidden;
}
header {
    background: radial-gradient(circle, rgba(76, 175, 80, 0.8), transparent);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}
header h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 3em;
    color: #ffffff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    z-index: 2;
}
header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
    animation: hero-move 20s linear infinite;
    transform: rotate(-45deg);
    z-index: 1;
}
@keyframes hero-move {
    0% { transform: translateX(0) translateY(0) rotate(-45deg); }
    100% { transform: translateX(-50%) translateY(-50%) rotate(-45deg); }
}
section {
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}
section:nth-child(even) {
    background: linear-gradient(135deg, #ffffff, #f4f9f2);
}
.card {
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin: 20px 0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}
.card img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}
pre {
    background: #f9f9f9;
    border-left: 5px solid #4CAF50;
    padding: 15px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    color: #333333;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}
table th, table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}
table th {
    background: #4CAF50;
    color: #ffffff;
}
button {
    background: #4CAF50;
    color: #ffffff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.3s ease, background 0.3s ease;
}
button:hover {
    background: #45a049;
    transform: scale(1.05);
}
@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    section {
        padding: 20px 10px;
    }
    pre {
        font-size: 0.8em;
    }
}