body {
    font-family: 'Roboto', sans-serif;
    background: radial-gradient(circle, #0A1F3D, #061429);
    color: #FFFFFF;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    overflow-x: hidden;
}
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background: linear-gradient(135deg, #0A1F3D, #1E3A5F);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}
header h1 {
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 2px;
    color: #FF9F43;
}
nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}
nav ul li a {
    text-decoration: none;
    color: #C7B8EA;
    transition: color 0.3s ease;
}
nav ul li a:hover {
    color: #FFD700;
}
.hero-section {
    position: relative;
    height: 500px;
    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;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 31, 61, 0.7);
}
.hero-section h2 {
    font-size: 48px;
    font-weight: bold;
    letter-spacing: 3px;
    z-index: 1;
}
.hero-section p {
    font-size: 20px;
    margin-top: 20px;
    z-index: 1;
}
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    padding: 40px;
    background: #F5F5F5;
    color: #0A1F3D;
}
.card {
    background-color: white;
    border: 1px solid #C7B8EA;
    border-radius: 8px;
    padding: 16px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}
.card:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
.card img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    margin-bottom: 10px;
}
.card h3 {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 10px;
}
.card p {
    font-size: 14px;
    line-height: 1.4;
}
.code-block {
    background: #0A1F3D;
    color: #FFFFFF;
    padding: 15px;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 14px;
    overflow-x: auto;
    margin: 20px 0;
}
footer {
    background: linear-gradient(135deg, #0A1F3D, #1E3A5F);
    color: #C7B8EA;
    text-align: center;
    padding: 20px;
    font-size: 14px;
}
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 10px;
        padding: 15px;
    }
    .hero-section h2 {
        font-size: 36px;
    }
    .hero-section p {
        font-size: 16px;
    }
    .features {
        padding: 20px;
    }
}