#progress-bar-wrapper {
    width: 100%;
    background-color: rgba(0, 0, 0, 0.12); /* Light gray background */
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    height: 4px; /* Thin, Material Design style */
    margin-top: 15px;
    opacity: 0;
    transition: opacity 0.5s ease;
}

#progress-bar {
    width: 0; /* Start at 0, update this dynamically with JS */
    height: 100%;
    background-color: #4285f4; /* Google Blue color */
    border-radius: 4px;
    transition: width 0.3s ease, opacity 0.3s ease; /* Smooth animation */
    position: absolute;
}

#progress-bar::after {
    content: '';
    display: block;
    width: 100px; /* Animation width */
    height: 4px;
    position: absolute;
    top: 0;
    left: -100px; /* Start from outside */
    background: linear-gradient(to right, rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0));
    animation: progress-glow 1.5s infinite ease-in-out; /* Glowing animation */
}

@keyframes progress-glow {
    0% {
        left: -100px;
    }
    50% {
        left: -50px;
    }
    100% {
        left: 100%;
    }
}