body {
    font-family: Arial, sans-serif;
    background-color: #f7f9fc;
    margin: 0;
    padding: 0;
    color: #222;
}
header {
    background-color: #ffffff;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #eee;
}
.logo {
    height: 50px;
}
nav ul {
    list-style: none;
    display: flex;
    gap: 15px;
}
nav ul li a {
    text-decoration: none;
    color: #0077cc;
}
main {
    padding: 20px;
}
.resumen {
    background: #fff;
    border: 1px solid #ddd;
    padding: 15px;
    margin-top: 20px;
    border-radius: 8px;
}
footer {
    background-color: #f0f0f0;
    text-align: center;
    padding: 10px;
    font-size: 12px;
    color: #555;
}