/* Modern, professional styling */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f9f9f9;
    --border-color: #ddd;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
    border-bottom: 5px solid var(--secondary-color);
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

nav li {
    margin: 0 1rem;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem;
    transition: all 0.3s ease;
}

nav a:hover {
    color: var(--secondary-color);
}

section {
    margin-bottom: 3rem;
    padding: 2rem;
    background-color: var(--light-bg);
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

h3 {
    color: var(--secondary-color);
    margin: 1.5rem 0 1rem;
}

p {
    margin-bottom: 1rem;
}

ul {
    margin-left: 2rem;
    margin-bottom: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: #777;
    font-size: 0.9rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    header {
        padding: 1rem 0;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    nav ul {
        flex-direction: column;
    }
    
    nav li {
        margin: 0.5rem 0;
    }
    
    section {
        padding: 1.5rem;
    }
}