body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 0;
}

header {
    background: #2c3e50;
    color: white;
    padding: 20px;
}

header h1 {
    margin: 0;
}

nav a {
    color: #ecf0f1;
    margin-right: 20px;
    text-decoration: none;
}

section {
    margin: 30px;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

table th, table td {
    padding: 12px;
    border: 1px solid #ccc;
}

table th {
    background: #34495e;
    color: white;
}

.formulario {
    background: white;
    padding: 20px;
    max-width: 450px;
}

form label {
    display: block;
    margin-top: 10px;
}

form select, form button, form input {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    box-sizing: border-box;
}

button {
    background: #2980b9;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #1c5982;
}

#mensaje {
    margin-top: 15px;
    font-weight: bold;
}