* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    color: #222;
}

header {
    background: #17324d;
    color: white;
    padding: 20px;
}

header h1 {
    margin: 0 0 15px;
}

nav a {
    color: white;
    margin-right: 15px;
    text-decoration: none;
}

main {
    max-width: 1100px;
    margin: 30px auto;
    background: white;
    padding: 25px;
    border-radius: 8px;
}

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

th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

th {
    background: #e9eef3;
}

form {
    max-width: 500px;
}

label {
    display: block;
    margin-top: 15px;
    margin-bottom: 5px;
    font-weight: bold;
}

input, select, button {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
}

button, .boton {
    display: inline-block;
    width: auto;
    background: #17324d;
    color: white;
    border: none;
    padding: 9px 13px;
    text-decoration: none;
    cursor: pointer;
    border-radius: 4px;
}

.peligro {
    background: #9b2226;
}

.mensaje {
    padding: 12px;
    margin-bottom: 20px;
    background: #e7f5e9;
    border: 1px solid #9bd0a1;
}

footer {
    text-align: center;
    color: #666;
    padding: 20px;
}