body {
    margin: 0;
    font-family: 'Open Sans', sans-serif;
    background: linear-gradient(135deg, #000428, #004e92);
    color: #ffffff;
    overflow-x: hidden;
}

header {
    position: relative;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: url('https://images.gptkong.com/demo/sample1.png'), linear-gradient(135deg, #1a1a1a, #37ff9e);
    background-size: cover;
    background-blend-mode: overlay;
}

header h1 {
    font-family: 'Pacifico', cursive;
    font-size: 48px;
    color: #37ff9e;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
}

header p {
    font-size: 20px;
    line-height: 1.6;
    max-width: 800px;
    margin: 20px auto;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    height: 100%;
    background: linear-gradient(180deg, #1a1a1a, #37ff9e);
    padding: 20px;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

.sidebar a {
    display: block;
    color: #ffffff;
    text-decoration: none;
    font-size: 18px;
    margin-bottom: 15px;
    transition: color 0.3s ease;
}

.sidebar a:hover {
    color: #ff6f61;
}

.content {
    margin-left: 270px;
    padding: 40px;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

@media (max-width: 768px) {
    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        padding: 10px;
    }
    .content {
        margin-left: 0;
        padding: 20px;
    }
}

h2, h3, h4 {
    font-family: 'Pacifico', cursive;
    color: #37ff9e;
    margin-top: 40px;
}

p {
    font-size: 16px;
    line-height: 1.6;
    color: #d1d1d1;
    margin-bottom: 20px;
}

pre {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 14px;
    margin: 20px 0;
}

code {
    color: #37ff9e;
    font-family: 'Courier New', monospace;
}

.button {
    display: inline-block;
    padding: 10px 20px;
    background: #37ff9e;
    color: #1a1a1a;
    border-radius: 20px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s ease;
}

.button:hover {
    transform: scale(1.1);
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.image-gallery img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.image-gallery img:hover {
    transform: scale(1.05);
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

@keyframes move-particle {
    from { transform: translate(0, 0); }
    to { transform: translate(200px, 200px); }
}

.particle {
    position: absolute;
    width: 10px;
    height: 10px;
    background: #37ff9e;
    border-radius: 50%;
    animation: move-particle 5s infinite alternate;
}

footer {
    text-align: center;
    padding: 20px;
    background: #1a1a1a;
    color: #d1d1d1;
    margin-top: 40px;
}

footer p {
    font-size: 14px;
}