:root {
    --primary-color: #8BC34A;
    --secondary-color: #F7DC6F;
    --accent-color: #34495E;
    --gradient-bg: radial-gradient(circle, rgba(139, 195, 74, 0.8), transparent);
    --hover-color: #FFC107;
    --text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

body {
    font-family: 'Roboto', sans-serif;
    background: var(--gradient-bg);
    color: var(--accent-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(52, 73, 94, 0.9);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

header .logo {
    font-size: 24px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
}

header nav a {
    color: white;
    text-decoration: none;
    margin-left: 20px;
    font-size: 16px;
    transition: color 0.3s ease;
}

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

.hero-section {
    height: 100vh;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center center/cover;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    text-shadow: var(--text-shadow);
}

.hero-section h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.hero-section p {
    font-size: 20px;
    max-width: 600px;
}

.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    padding: 20px;
    margin-top: 100px;
}

.card {
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: transform 0.3s ease;
}

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

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

.card h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--accent-color);
}

.card p {
    font-size: 16px;
    color: #555;
}

.article-container {
    padding: 20px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    margin: 20px auto;
    max-width: 1200px;
}

pre {
    background: #f4f4f4;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

code {
    color: #D32F2F;
    font-family: 'Courier New', Courier, monospace;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

table th, table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

table th {
    background: var(--primary-color);
    color: white;
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 36px;
    }

    .hero-section p {
        font-size: 16px;
    }

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 2s ease-in-out;
}