* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.7;
}

.container {
    width: 90%;
    max-width: 1100px;
    margin: auto;
}

header {
    background-color: #1e3a5f;
    color: #fff;
    padding: 20px 0;
}

header h1 {
    text-align: center;
    margin-bottom: 10px;
}

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

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

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

.intro {
    background: #fff;
    padding: 30px;
    margin: 30px 0;
    border-radius: 6px;
}

article {
    background: #fff;
    padding: 30px;
    border-radius: 6px;
}

article h2, article h3 {
    margin-top: 25px;
    color: #1e3a5f;
}

article p {
    margin-top: 15px;
    text-align: justify;
}

footer {
    background: #1e3a5f;
    color: #fff;
    text-align: center;
    padding: 15px 0;
    margin-top: 40px;
}