:root {
    --primary-color: #0a192f;
    --secondary-color: #64ffda;
    --background-gradient: radial-gradient(circle, rgba(10, 25, 47, 0.8), transparent);
    --glass-effect: rgba(255, 255, 255, 0.1);
    --box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    --font-family: 'Roboto', sans-serif;
}

body {
    margin: 0;
    font-family: var(--font-family);
    background: var(--background-gradient);
    color: #fff;
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: linear-gradient(135deg, #0a192f, #112240);
    box-shadow: var(--box-shadow);
}

header .logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--secondary-color);
    text-transform: uppercase;
}

header nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

header nav ul li a {
    text-decoration: none;
    color: #fff;
    font-weight: 500;
    transition: color 0.3s ease;
}

header nav ul li a:hover {
    color: var(--secondary-color);
}

.hero-section {
    position: relative;
    height: 400px;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #fff;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 25, 47, 0.6);
}

.hero-section h1 {
    font-size: 48px;
    font-weight: bold;
    z-index: 1;
}

.content-section {
    padding: 40px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.card {
    background: var(--glass-effect);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
}

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

.card img {
    width: 100%;
    border-radius: 10px;
    margin-bottom: 10px;
}

.code-block {
    background: rgba(0, 0, 0, 0.8);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-family: 'Courier New', Courier, monospace;
    color: #64ffda;
}

footer {
    background: linear-gradient(135deg, #0a192f, #112240);
    padding: 20px;
    text-align: center;
    color: #fff;
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 10px;
    }

    .hero-section h1 {
        font-size: 36px;
    }
}