.smu-drop{ border:2px dashed #aaa; padding:20px; border-radius:10px; max-width:600px; margin:20px auto; }
.smu-drop.smu-highlight{ background:#f0f8ff; border-color:#2a7ae2; }
.smu-file-row{ display:flex; gap:10px; padding:6px 0; border-top:1px solid #eee; }
.smu-success{ color:green; }
.smu-error{ color:#c33; }