body, html {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    color: #FFFFFF;
    background: linear-gradient(135deg, #0A192F, #142850);
    overflow-x: hidden;
    height: 100%;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 25, 47, 0.8);
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
}

header .logo {
    font-family: 'Montserrat', sans-serif;
    font-size: 24px;
    font-weight: bold;
    color: #FF6B35;
}

header nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

header nav ul li {
    margin-left: 20px;
}

header nav ul li a {
    text-decoration: none;
    color: #FFFFFF;
    font-size: 16px;
    transition: color 0.3s ease;
}

header nav ul li a:hover {
    color: #FF6B35;
}

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

.hero-section h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 48px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-section p {
    font-size: 20px;
    margin-top: 20px;
    line-height: 1.5;
}

.features-section {
    padding: 50px 20px;
    background: linear-gradient(135deg, #142850, #0A192F);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

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

.feature-card img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 50%;
    margin-bottom: 15px;
}

.feature-card h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 20px;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    line-height: 1.5;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.article-section {
    padding: 50px 20px;
    background: linear-gradient(135deg, #0A192F, #142850);
    color: #FFFFFF;
}

.article-section h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: 36px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 30px;
}

.article-section p {
    font-size: 16px;
    line-height: 1.5;
    margin-bottom: 20px;
}

.article-section pre {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-size: 14px;
}

.article-section code {
    color: #FF6B35;
}

footer {
    background: #0A192F;
    padding: 20px;
    text-align: center;
    font-size: 14px;
}

@media (max-width: 768px) {
    header .logo {
        font-size: 20px;
    }

    header nav ul {
        flex-direction: column;
        align-items: center;
    }

    header nav ul li {
        margin: 10px 0;
    }

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

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