:root {
    --primary-color: #002B5B;
    --secondary-color: #1A1A1A;
    --accent-color: #39FF14;
    --background-gradient: linear-gradient(to bottom, #000000, #1A1A1A);
    --text-color: #FFFFFF;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    --font-family-body: 'Roboto', sans-serif;
    --font-family-heading: 'Poppins', sans-serif;
}
body {
    margin: 0;
    font-family: var(--font-family-body);
    background: var(--background-gradient);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}
header {
    position: relative;
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover, var(--background-gradient);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--accent-color);
    text-shadow: 0 0 8px rgba(0, 0, 0, 0.8);
}
header h1 {
    font-family: var(--font-family-heading);
    font-size: 3rem;
    font-weight: bold;
    letter-spacing: 2px;
    animation: fadeIn 2s ease-in-out;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}
.card {
    background: var(--secondary-color);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.3);
}
.card img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    margin-bottom: 10px;
}
pre {
    background: #1E1E1E;
    color: var(--accent-color);
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
}
code {
    color: var(--accent-color);
}
.button {
    display: inline-block;
    background: var(--accent-color);
    color: var(--primary-color);
    padding: 10px 20px;
    border-radius: 50px;
    font-family: var(--font-family-heading);
    font-size: 1rem;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    transition: background 0.3s ease;
}
.button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.5s ease, height 0.5s ease;
}
.button:hover {
    background: var(--primary-color);
}
.button:hover::before {
    width: 200px;
    height: 200px;
}
@media (max-width: 768px) {
    header h1 { font-size: 2rem; }
    .container { padding: 10px; }
    pre { font-size: 0.8rem; }
}