/* Separate styles for the Intro Background Canvas */
#intro-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0; /* Behind HTML content (10), but above main background (-1) */
    pointer-events: none; /* Let clicks pass through to buttons */
    transition: opacity 1s ease; /* Smooth fade out when starting */
}