.stl-viewer {
    width: 100%;
    height: 400px;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin: 10px 0;
    touch-action: none; /* Prevent default touch behaviors */
    position: relative; /* For loading indicator positioning */
}

.viewer-controls {
    text-align: center;
    margin: 10px 0;
}

.viewer-controls button {
    margin: 0 5px;
    padding: 8px 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    min-height: 44px; /* Minimum touch target size */
    min-width: 44px;
}

.viewer-controls button:hover {
    background-color: #0056b3;
}

.viewer-controls button:active {
    background-color: #004494;
}

/* Mobile-specific styles */
@media (max-width: 768px) {
    .stl-viewer {
        height: 300px;
        margin: 5px 0;
    }
    
    .viewer-controls {
        margin: 15px 0;
    }
    
    .viewer-controls button {
        margin: 5px;
        padding: 10px 15px;
        font-size: 16px;
        min-height: 48px;
        min-width: 48px;
        display: inline-block;
    }
    
    /* Stack buttons vertically on very small screens */
    @media (max-width: 480px) {
        .viewer-controls button {
            display: block;
            width: 100%;
            margin: 5px 0;
            max-width: 280px;
        }
    }
}

/* Prevent text selection during touch interactions */
.stl-viewer, .viewer-controls {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Loading indicator styles */
.loading-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #666;
    z-index: 1000;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-indicator p {
    margin: 0;
    font-size: 14px;
}