body, html {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    color: #ffffff;
    line-height: 1.6;
    background: linear-gradient(135deg, #00467f, #0082c8);
    overflow-x: hidden;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 70, 127, 0.9);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

header h1 {
    font-size: 24px;
    font-weight: bold;
    color: #00d891;
    margin: 0;
}

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

header nav a:hover {
    color: #00a86b;
}

.hero {
    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: white;
    text-align: center;
}

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

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.module {
    padding: 80px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.module:nth-child(even) {
    background: linear-gradient(to bottom, #003d66, #005b99);
}

.module:nth-child(odd) {
    background: linear-gradient(to bottom, #005b99, #003d66);
}

.module img {
    max-width: 320px;
    margin-bottom: 20px;
    border-radius: 10px;
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.module h2 {
    font-size: 32px;
    margin-bottom: 20px;
    color: #00d891;
}

.module p {
    font-size: 18px;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.parallax {
    height: 60vh;
    background: url('https://images.gptkong.com/demo/sample2.png') no-repeat center center/cover;
    background-attachment: fixed;
    position: relative;
}

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

.content {
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 20px;
    position: relative;
    z-index: 2;
    text-align: center;
}

footer {
    background: #003d66;
    color: white;
    text-align: center;
    padding: 30px 20px;
    font-size: 14px;
}

footer p {
    margin: 0;
}

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

    .module h2 {
        font-size: 28px;
    }

    .parallax {
        height: 40vh;
    }
}

@media (max-width: 480px) {
    header {
        flex-direction: column;
        padding: 10px;
    }

    header h1 {
        font-size: 20px;
    }

    header nav a {
        margin: 5px 0;
        font-size: 14px;
    }

    .hero-content h1 {
        font-size: 28px;
    }

    .module h2 {
        font-size: 24px;
    }

    .parallax {
        height: 30vh;
    }
}

pre {
    background: rgba(0, 0, 0, 0.8);
    color: #00d891;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.5;
}

code {
    color: #00d891;
    font-family: monospace;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: rgba(0, 0, 0, 0.8);
    color: white;
}

table th, table td {
    padding: 10px;
    text-align: left;
    border: 1px solid #00d891;
}

table th {
    background: #005b99;
}