.b64-drop-zone { border: 2px dashed var(--border); border-radius: var(--radius-lg); padding: 40px 20px; text-align: center; cursor: pointer; transition: all 0.2s; color: var(--text-muted); }
.b64-drop-zone:hover,.b64-drop-zone.dragover { border-color: var(--primary); background: rgba(0,102,255,0.04); color: var(--primary); }
.b64-preview { margin-top: 16px; text-align: center; }
.b64-preview img { max-width: 100%; max-height: 300px; border-radius: var(--radius); border: 1px solid var(--border); }
.b64-info { margin-top: 8px; font-size: 13px; color: var(--text-muted); }