body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f6f9;
    color: #333;
}

header {
    background-color: #123c69;
    color: white;
    text-align: center;
    padding: 30px;
}

nav {
    background-color: #0b2545;
    text-align: center;
    padding: 15px;
}

nav a {
    color: white;
    text-decoration: none;
    display: inline-block;
    padding: 12px 20px;
    margin: 5px;
    background-color: #1b6ca8;
    border-radius: 5px;
}

nav a:hover {
    background-color: #3282b8;
}

main {
    width: 85%;
    max-width: 900px;
    margin: 40px auto;
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    text-align: center;
}

footer {
    background-color: #123c69;
    color: white;
    text-align: center;
    padding: 15px;
}

@media screen and (max-width: 600px) {
    nav a {
        display: block;
        margin: 8px auto;
    }

    main {
        width: 85%;
        padding: 15px;
    }

    header {
        padding: 20px;
    }
}

form {
    max-width: 400px;
    margin: 20px auto;
    text-align: left;
}

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

form input {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
}

form button {
    width: 100%;
    padding: 12px;
    margin-top: 20px;
    background-color: #1b6ca8;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

form button:hover {
    background-color: #3282b8;
}

.error {
    color: #b00020;
    text-align: center;
}

.tabla-contenedor {
    width: 100%;
    overflow-x: auto;
}

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

th, td {
    padding: 12px;
    border: 1px solid #ddd;
    text-align: center;
}

th {
    background-color: #123c69;
    color: white;
}

tr:nth-child(even) {
    background-color: #f2f2f2;
}

td form {
    margin: 0;
}

td button {
    margin-top: 0;
}

form select {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
    background-color: white;
}

.estadisticas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin: 25px 0;
}

.estadistica {
    background-color: #e8f1fa;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
}

.estadistica h3 {
    font-size: 16px;
    color: #123c69;
}

.estadistica p {
    font-size: 28px;
    font-weight: bold;
}

.grafica {
    margin: 30px auto;
    max-width: 700px;
    text-align: left;
}

.barra-fondo {
    width: 100%;
    background-color: #e5e5e5;
    height: 35px;
    border-radius: 5px;
    overflow: hidden;
}

.barra-deposito {
    background-color: #228b57;
    height: 100%;
}

.barra-retiro {
    background-color: #c0392b;
    height: 100%;
}

.aviso-academico {
    margin: 20px auto;
    padding: 12px;
    max-width: 700px;
    background-color: #e8f1fa;
    color: #143d68;
    border: 1px solid #b5cde3;
    border-radius: 6px;
    text-align: center;
    font-size: 14px;
}

.logo-banco {
    display: block;
    width: 280px;
    max-width: 90%;
    height: auto;
    margin: 0 auto 15px;
    object-fit: contain;
}

@media (max-width: 600px) {
    .logo-banco {
        width: 220px;
    }
}