body {
            background: url('../img/fondo-principal.jpg') no-repeat center center fixed;
            background-size: cover;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: screen;
            padding: 20px;
        }
        .auth-card {
            background: rgba(255, 255, 255, 0.9);
            border-radius: 10px;
            box-shadow: 0 0 20px rgba(0,0,0,0.5);
            max-width: 450px;
            width: 100%;
            padding: 30px;
        }
        .logo-img {
            max-width: 150px;
            display: block;
            margin: 0 auto 20px;
        }
        .btn-primary {
            background-color: #007bff;
            border-color: #007bff;
        }
        .btn-primary:hover {
            background-color: #0056b3;
            border-color: #0056b3;
        }
        .form-label {
            color: #0d2346; /* Azul Oscuro solicitado */
            font-weight: 700; /* Resaltado visible */
            margin-bottom: 5px;
        }
        a {
            color: #007bff;
            text-decoration: none;
        }
        a:hover {
            color: #0056b3;
        }