* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #0D47A1, #651FFF, #AA00FF);
    color: #FFFFFF;
    line-height: 1.6;
    padding-top: 60px;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(13, 71, 161, 0.9);
    padding: 15px 0;
    z-index: 1000;
}

header nav {
    display: flex;
    justify-content: center;
}

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

header nav ul li {
    margin: 0 20px;
}

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

header nav ul li a:hover {
    color: #00E676;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
    padding: 20px 0;
}

h1, h2, h3, h4 {
    color: #FFFFFF;
    margin-bottom: 15px;
}

p {
    margin-bottom: 15px;
    color: #FFFFFF;
}

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

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

pre {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin-bottom: 20px;
}

code {
    font-family: 'Courier New', Courier, monospace;
    color: #00E676;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 10px 0;
}

.footer {
    text-align: center;
    padding: 20px 0;
    background-color: rgba(13, 71, 161, 0.9);
    margin-top: 40px;
}

@media (max-width: 1440px) {
    .container {
        width: 95%;
    }
}

@media (max-width: 1200px) {
    header nav ul li {
        margin: 0 15px;
    }
}

@media (max-width: 1024px) {
    h1 {
        font-size: 2em;
    }
    h2 {
        font-size: 1.75em;
    }
}

@media (max-width: 768px) {
    header nav {
        flex-direction: column;
    }
    header nav ul li {
        margin: 10px 0;
    }
    h1 {
        font-size: 1.8em;
    }
}

@media (max-width: 480px) {
    header nav ul li {
        margin: 8px 0;
    }
    h1 {
        font-size: 1.5em;
    }
    p, table, pre {
        font-size: 0.9em;
    }
}

@media (max-width: 320px) {
    header nav ul li a {
        font-size: 0.9em;
    }
    h1 {
        font-size: 1.3em;
    }
}

button, a.button {
    display: inline-block;
    padding: 10px 20px;
    background-color: #00E676;
    color: #0D47A1;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s;
}

button:hover, a.button:hover {
    background-color: #AA00FF;
}