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

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

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
    text-align: center;
    margin-bottom: 1rem;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: rgba(255,255,255,0.2);
}

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

section {
    background: white;
    margin: 2rem 0;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

section h2 {
    color: #667eea;
    margin-bottom: 1rem;
}

footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        gap: 1rem;
    }
    
    main {
        margin-top: 200px;
        padding: 1rem;
    }
}