* { box-sizing: border-box; }

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f2f4f7;
    margin: 0;
    padding: 0;
    color: #222;
}

header {
    background-color: #1e3a5f;
    color: #fff;
    padding: 18px 30px;
}

header h1 {
    margin: 0;
    font-size: 22px;
}

nav {
    background-color: #274b73;
    padding: 10px 30px;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin-right: 20px;
    font-size: 14px;
    font-weight: bold;
}

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

.contenedor {
    max-width: 950px;
    margin: 30px auto;
    background: #fff;
    padding: 25px 30px;
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.12);
}

h2 {
    margin-top: 0;
    color: #1e3a5f;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}

label {
    display: block;
    margin-top: 12px;
    font-weight: bold;
    font-size: 14px;
}

input[type=text], input[type=date], input[type=number], select {
    width: 100%;
    padding: 8px;
    margin-top: 4px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 14px;
}

.fila-item {
    display: flex;
    gap: 10px;
    align-items: end;
    margin-top: 10px;
    padding: 10px;
    background: #f8f9fb;
    border-radius: 6px;
}

.fila-item > div { flex: 1; }

button, .boton {
    background-color: #1e3a5f;
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    margin-top: 18px;
    display: inline-block;
    text-decoration: none;
}

button:hover, .boton:hover { background-color: #274b73; }

.boton-secundario {
    background-color: #6c757d;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    padding: 10px;
    border: 1px solid #ddd;
    text-align: left;
    font-size: 14px;
}

th {
    background-color: #1e3a5f;
    color: #fff;
}

tr:nth-child(even) { background-color: #f7f9fb; }

.mensaje-exito {
    background-color: #d4edda;
    color: #155724;
    padding: 12px;
    border-radius: 5px;
    margin-top: 15px;
}

.mensaje-error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 12px;
    border-radius: 5px;
    margin-top: 15px;
}

.total-final {
    text-align: right;
    font-size: 18px;
    font-weight: bold;
    margin-top: 10px;
    color: #1e3a5f;
}