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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #e0e0e0;
    background-color: #000000;
}

header {
    background-color: #111111;
    color: #ffffff;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.8);
    border-bottom: 2px solid #333333;
}

header h1 {
    text-align: center;
    margin-bottom: 1rem;
    font-size: 2rem;
    color: #ffffff;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

nav ul li {
    margin: 0 1rem;
}

nav ul li a {
    color: #cccccc;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 4px;
}

nav ul li a:hover {
    color: #ffffff;
    background-color: #333333;
}

main {
    margin-top: 150px;
    padding: 2rem;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

section {
    background-color: #1a1a1a;
    margin-bottom: 2rem;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.6);
    border: 1px solid #333333;
}

section h2 {
    color: #ffffff;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

section p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #cccccc;
}

footer {
    background-color: #111111;
    color: #cccccc;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
    border-top: 2px solid #333333;
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav ul li {
        margin: 0.5rem 0;
    }
    
    main {
        margin-top: 200px;
        padding: 1rem;
    }
    
    section {
        padding: 1rem;
    }
}