:root {
    --primary-color: #000046;
    --secondary-color: #1cb5e0;
    --accent-color: #7c00ff;
    --neon-blue: #00aaff;
    --background-gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --shadow-effect: 0 4px 8px rgba(0, 0, 0, 0.2);
    --hover-glow: 0 0 10px var(--neon-blue);
}

body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: var(--background-gradient);
    color: white;
    line-height: 1.6;
}

header {
    position: relative;
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/cover, var(--background-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

header h1 {
    font-size: 3rem;
    font-weight: bold;
    text-transform: uppercase;
    color: var(--accent-color);
    z-index: 1;
    position: relative;
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    padding: 10px 0;
    z-index: 1000;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-size: 1rem;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--accent-color);
}

main {
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

section {
    margin-bottom: 40px;
}

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

.grid-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow-effect);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
}

.grid-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--hover-glow);
}

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

h2, h3 {
    color: var(--accent-color);
    margin-bottom: 15px;
}

pre {
    background: rgba(0, 0, 0, 0.6);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

code {
    color: var(--neon-blue);
    font-family: 'Courier New', monospace;
}

.button {
    position: relative;
    background-color: var(--accent-color);
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.button::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.3);
    opacity: 0;
    border-radius: 5px;
    transition: opacity 0.3s ease;
}

.button:hover::after {
    opacity: 1;
}

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

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

footer {
    text-align: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
}