#mobile-controls {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Let clicks pass through to canvas if not on buttons */
    z-index: 100;
}

.mobile-btn {
    position: absolute;
    width: 80px;
    height: 80px;
    background-color: rgba(255, 255, 255, 0.3);
    border: 3px solid rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    pointer-events: auto;
    touch-action: none; /* Prevent browser handling like scrolling */
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    user-select: none;
    -webkit-user-select: none;
}

.mobile-btn svg {
    display: block;
    /* Optional: add filter drop-shadow for better contrast if needed */
    filter: drop-shadow(0px 0px 2px rgba(0,0,0,0.5));
}

.mobile-btn:active, .mobile-btn.active {
    background-color: rgba(255, 255, 255, 0.6);
}

#mobile-left {
    bottom: 20px;
    left: 20px;
}

#mobile-right {
    bottom: 20px;
    right: 20px;
}

#mobile-back {
    top: 60px; /* Below HUD */
    left: 20px; /* Aligned with mobile-left */
    width: 60px;
    height: 60px;
}