body {
    font-family: 'Playfair Display', serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #8BC34A, #2196F3);
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    background: radial-gradient(circle, rgba(255, 255, 255, 0.9), transparent), url('https://images.gptkong.com/demo/sample1.png');
    background-size: cover;
    background-position: center;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background: repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.1) 10px, transparent 10px, transparent 20px);
    animation: aurora-move 15s linear infinite;
    transform-origin: 50% 50%;
}

@keyframes aurora-move {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

header h1 {
    font-family: 'Roboto Slab', serif;
    font-size: 3rem;
    color: #fff;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
    z-index: 1;
}

header p {
    font-size: 1.2rem;
    color: #fff;
    max-width: 600px;
    margin: 1rem auto;
    z-index: 1;
}

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

.item {
    background: linear-gradient(135deg, #F5DEB3, #E0E0E0);
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    text-align: center;
    transition: transform 0.3s ease;
}

.item:hover {
    transform: translateY(-10px);
}

.item img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}

article {
    margin: 20px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
}

article h2, article h3 {
    color: #2196F3;
}

article pre {
    background: #212121;
    color: #fff;
    padding: 10px;
    border-radius: 5px;
    overflow-x: auto;
}

.button-primary {
    background: #2196F3;
    color: #fff;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 5px;
    position: relative;
    overflow: hidden;
}

.button-primary::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

.button-primary:hover::before {
    width: 200px;
    height: 200px;
}

footer {
    background: #8BC34A;
    color: #fff;
    text-align: center;
    padding: 20px;
    margin-top: 20px;
}

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

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