body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(to bottom, #001E3C, #1E3C72);
    color: #fff;
    line-height: 1.6;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.header {
    text-align: center;
    padding: 40px 0;
    background: linear-gradient(135deg, #0F6CB7, #8A2BE2);
    color: #fff;
    position: relative;
}

.header h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 3rem;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.header p {
    font-size: 1.2rem;
    margin-top: 10px;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover, 
                url('https://images.gptkong.com/demo/sample2.png') no-repeat center/cover;
    opacity: 0.2;
    z-index: -1;
}

.section {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.section:hover {
    transform: translateY(-5px);
}

h2, h3, h4 {
    color: #0F6CB7;
    font-family: 'Roboto Bold', sans-serif;
    margin-top: 0;
}

p {
    color: #D3D3D3;
    font-size: 1rem;
    line-height: 1.6;
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    margin-bottom: 10px;
    color: #fff;
    position: relative;
    padding-left: 20px;
}

ul li::before {
    content: '•';
    color: #FFA500;
    position: absolute;
    left: 0;
}

pre {
    background: #1E3C72;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    color: #fff;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

button {
    background: linear-gradient(135deg, #FFA500, #FF4500);
    border: none;
    color: #fff;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

button::after {
    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%);
    animation: ripple 0.6s ease-out;
}

@keyframes ripple {
    0% {
        width: 0;
        height: 0;
        opacity: 1;
    }
    100% {
        width: 200px;
        height: 200px;
        opacity: 0;
    }
}

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

@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 2rem;
    }

    pre {
        font-size: 0.8rem;
    }
}

.footer {
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, #001E3C, #1E3C72);
    color: #fff;
    margin-top: 40px;
}

.module-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    transition: transform 0.3s ease;
}

.module-card:hover {
    transform: scale(1.05);
}

.module-card img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 50%;
    margin: 0 auto 10px;
}