.navbar-brand.brand-logo {
    position: relative;
    color: transparent !important; /* hide real text */
}

.navbar-brand.brand-logo>span {
    position: relative;
    color: transparent !important; /* hide real text */
}

.navbar-brand.brand-logo>span::after {
    content: "AI-WORK";
    color: red;       /* choose your color */
    position: absolute;
    left: 0;
    top: 0;
}