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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

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

header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

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

nav ul li {
    margin: 0 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #3498db;
}

main {
    margin-top: 80px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    background-color: white;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

.hero {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
}

.profile-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
    border: 5px solid #3498db;
}

h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 10px;
}

.title {
    font-size: 1.2rem;
    color: #7f8c8d;
    font-style: italic;
}

h2 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
    margin: 30px 0 20px 0;
}

section {
    margin-bottom: 30px;
}

ul, ol {
    margin-left: 20px;
}

ul li, ol li {
    margin-bottom: 8px;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

pre {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 5px;
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
}

code {
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.4;
}

footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

footer img {
    height: 40px;
    width: auto;
    display: block;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

footer a {
    color: white;
}

@media (max-width: 768px) {
    main {
        margin: 80px 20px 0 20px;
        padding: 20px;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav ul li {
        margin: 5px 0;
    }
    
    .profile-photo {
        width: 150px;
        height: 150px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    footer {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .profile-photo {
        width: 120px;
        height: 120px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    main {
        padding: 15px;
    }
}