body {
    background-color: #f8f9fa;
}

.main-header {
    background-image: url('../images/encabezado.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    margin-bottom: 2rem;
}

.main-header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.header-content {
    position: relative;
    z-index: 2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.7);
}

.card {
    border: none;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.card-header.card-heading {
    background-color: #003366;
    color: white;
    text-align: center;
    padding: 1.5rem;
    border-bottom: 5px solid #FFC107;
}

.card-title {
    margin: 0;
    font-weight: 300;
    letter-spacing: 1px;
}

.form-label {
    font-weight: 600;
}

.btn-primary {
    background-color: #003366;
    border-color: #003366;
}

.btn-primary:hover {
    background-color: #002244;
    border-color: #002244;
}

.footer {
    padding: 1rem 0;
    background-color: #343a40;
    color: white;
    text-align: center;
    font-size: 0.9rem;
    margin-top: 2rem;
}