body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: #333;
    margin: 0;
    padding: 0;
    background-color: #fff;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 40px 20px;
}

header h1 {
    font-size: 24px;
    font-weight: normal;
    margin: 0 0 10px 0;
    color: #000;
}

nav {
    font-size: 16px;
    margin-bottom: 40px;
    color: #666;
}

nav a {
    color: #0066cc;
    text-decoration: none;
}

nav a:hover {
    text-decoration: underline;
}

h2 {
    font-size: 18px;
    font-weight: normal;
    margin: 30px 0 15px 0;
    color: #000;
}

p {
    font-size: 16px;
    margin: 0 0 15px 0;
    color: #333;
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul {
    padding-left: 20px;
    margin: 0 0 15px 0;
}

li {
    margin: 5px 0;
    font-size: 16px;
    color: #333;
}

em {
    font-style: italic;
    color: #333;
}

.newsletter-signup {
    background-color: #f8f9fa;
    padding: 20px;
    margin: 20px 0;
    border-radius: 4px;
}

.newsletter-signup h3 {
    margin-top: 0;
    font-size: 18px;
    font-weight: normal;
}

.back-link {
    margin-bottom: 30px;
    font-size: 14px;
}

.back-link a {
    color: #666;
}

.profile-image {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 20px 0 30px 0;
    display: block;
    filter: grayscale(100%);
}

@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }
    
    header h1 {
        font-size: 20px;
    }
    
    nav {
        font-size: 14px;
    }
    
    h2 {
        font-size: 16px;
    }
    
    p, li {
        font-size: 14px;
    }
}