#impromptu-loader {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    background: #fff;
    z-index: 2147483647; /* on top of everything */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center; /* center vertically */
    pointer-events: none;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

    #impromptu-loader.hidden {
        display: none !important;
    }

    #impromptu-loader .msg {
        margin-top: 40px; /* push text slightly below the spinner */
        font-size: 0.95rem;
        color: rgba(0, 0, 0, 0.55);
        text-align: center;
    }

    #impromptu-loader .loading-bar {
        width: 140px;
        height: 3px;
        margin-top: 10px;
        background-color: rgba(0, 0, 0, 0.10); /* track */
        border-radius: 2px;
        overflow: hidden;
        position: relative;
    }

        #impromptu-loader .loading-bar::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            height: 100%;
            width: 0%;
            background-color: rgba(0, 0, 0, 0.35); /* active fill */
            animation: grow-bar 1.2s ease-out forwards;
        }

@keyframes grow-bar {
    from {
        width: 0%;
    }

    to {
        width: 100%;
    }
}