#pro-retouch-app {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background-color: #fff;
    font-family: 'Segoe UI', sans-serif;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.prt-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    flex-wrap: wrap;
    background: #f4f4f4;
    padding: 15px;
    border-radius: 8px;
}

.prt-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s ease;
    color: white;
}

.prt-upload-btn { background-color: #555; }
.prt-upload-btn:hover { background-color: #333; }

#prt-enhance-button { background-color: #0073aa; }
#prt-enhance-button:hover { background-color: #005177; }
#prt-enhance-button:disabled { background-color: #ccc; cursor: not-allowed; }

.prt-download-btn { background-color: #28a745; }
.prt-download-btn:hover { background-color: #218838; }

/* Toggle Checkbox Style */
.prt-toggle-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #333;
    background: #fff;
    padding: 8px 12px;
    border-radius: 4px;
    border: 1px solid #ddd;
}

/* Comparison Container */
#prt-comparison-container {
    position: relative;
    width: 100%;
    border: 1px solid #ccc;
    border-radius: 4px;
    overflow: hidden;
}

.prt-compare-wrapper { position: relative; width: 100%; }

canvas { display: block; width: 100%; height: auto; }

#prt-enhanced-canvas { display: block; }
#prt-original-canvas {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    clip-path: inset(0 50% 0 0);
}

/* Slider UI */
.prt-range-input {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    margin: 0; opacity: 0; cursor: ew-resize; z-index: 20;
}

#prt-slider-handle {
    position: absolute; top: 0; bottom: 0; left: 50%;
    width: 2px; background: #fff; z-index: 10;
    pointer-events: none; box-shadow: 0 0 5px rgba(0,0,0,0.5);
}

.prt-handle-circle {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 32px; height: 32px;
    background: #fff; border-radius: 50%; color: #0073aa;
    display: flex; align-items: center; justify-content: center;
    font-weight: bold; box-shadow: 0 2px 5px rgba(0,0,0,0.3);
}

.prt-label {
    position: absolute; top: 15px; padding: 4px 8px;
    background: rgba(0, 0, 0, 0.6); color: white;
    border-radius: 4px; font-size: 12px; z-index: 5; pointer-events: none;
}
.prt-label-before { left: 15px; }
.prt-label-after { right: 15px; }

/* Loading Spinner */
.prt-spinner {
    border: 4px solid #f3f3f3; border-top: 4px solid #0073aa;
    border-radius: 50%; width: 40px; height: 40px;
    animation: spin 1s linear infinite; margin: 0 auto 10px;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }