body, html {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #1a1a40, #000000);
    color: #ffffff;
    overflow-x: hidden;
    line-height: 1.6;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(26, 26, 64, 0.8);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

header h1 {
    color: #00ff99;
    font-size: 1.5rem;
    margin: 0;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 20px;
}

nav ul li a {
    color: #00ff99;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #ffffff;
}

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

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1;
}

.hero-section h1 {
    font-size: 3rem;
    z-index: 2;
    color: #00ff99;
}

.hero-section p {
    font-size: 1.2rem;
    z-index: 2;
}

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

.module {
    background: linear-gradient(135deg, #2a2a50, #1a1a40);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, background 0.3s ease;
    position: relative;
    overflow: hidden;
}

.module:hover {
    transform: scale(1.05);
    background: #00ff99;
}

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

.module h3 {
    color: #00ff99;
    font-size: 1.5rem;
    margin: 0 0 10px;
}

.module p {
    font-size: 1rem;
    margin: 0;
}

.article-section {
    padding: 40px 20px;
    background: linear-gradient(135deg, #1a1a40, #000000);
    color: #ffffff;
}

.article-section h2 {
    color: #00ff99;
    font-size: 2rem;
    margin-bottom: 20px;
}

.article-section pre {
    background: #2a2a50;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
}

.article-section code {
    color: #00ff99;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.2rem;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .hero-section p {
        font-size: 1rem;
    }

    .module h3 {
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .grid-container {
        grid-template-columns: 1fr;
    }

    .hero-section h1 {
        font-size: 1.5rem;
    }

    .hero-section p {
        font-size: 0.8rem;
    }
}