.pca-root { max-width:900px; margin:20px auto; font-family:Arial,Helvetica,sans-serif; }
.pca-panel input, .pca-panel select, .pca-optimizer input { display:block; padding:8px; margin:8px 0; width:260px; }
.pca-panel button, .pca-optimizer button { padding:8px 12px; background:#2563eb; color:#fff; border:0; border-radius:6px; cursor:pointer; }
.pca-panel { border:1px solid #ddd; padding:14px; border-radius:8px; background:#fafafa; max-width:380px; }
.pca-optimizer { border:1px solid #eee; padding:12px; margin-top:10px; border-radius:8px; max-width:380px; }
#pca-results, #pca-opt-results { margin-top:10px; font-size:14px; }