body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
    color: #003300;
}
header {
    background: url('img/iguazu-bg.jpg') no-repeat center center;
    background-size: cover;
    color: white;
    text-shadow: 1px 1px 4px #000;
    padding: 4em 1em;
    text-align: center;
}
header h1 {
    font-size: 2.5em;
    margin: 0.2em 0;
}
.boton {
    background: #4caf50;
    color: white;
    padding: 1em 2em;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    display: inline-block;
    margin-top: 1em;
}
section {
    padding: 2em 1em;
    max-width: 800px;
    margin: auto;
}
footer {
    text-align: center;
    background: #1b5e20;
    color: white;
    padding: 1em;
    margin-top: 2em;
}
form input, form select, form button {
    display: block;
    width: 100%;
    margin: 0.8em 0;
    padding: 1em;
    font-size: 1em;
    border: 1px solid #ccc;
    border-radius: 4px;
}
form button {
    background: #2e7d32;
    color: white;
    font-weight: bold;
    border: none;
    cursor: pointer;
    transition: background 0.3s ease;
}
form button:hover {
    background: #1b5e20;
}