Polish data workspace density

frontend/src/styles/app.css

@@ -1019,15 +1019,68 @@ section th {
   gap: 0.7rem;
 }
 
-.dataset-upload-form {
-  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
-  align-items: end;
+.data-selection-summary {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr);
+  gap: 0.16rem;
+  border: 1px solid rgba(15, 118, 110, 0.26);
+  border-left: 4px solid var(--accent);
+  border-radius: 8px;
+  padding: 0.68rem 0.75rem;
+  background: linear-gradient(180deg, #ffffff, #f7fbf8);
+  box-shadow: 0 1px 0 rgba(19, 32, 24, 0.03);
+}
+
+.data-selection-summary span,
+.data-selection-summary small,
+.data-section-label {
+  color: var(--muted);
+  font-size: 0.74rem;
+  font-weight: 850;
+  letter-spacing: 0.04em;
+  line-height: 1.2;
+  text-transform: uppercase;
+}
+
+.data-selection-summary strong {
+  min-width: 0;
+  overflow-wrap: anywhere;
+  font-size: 0.98rem;
+  line-height: 1.24;
+}
+
+.data-selection-summary small {
+  letter-spacing: 0;
+  text-transform: none;
+}
+
+.data-panel-form-block,
+.data-panel-list-block {
+  display: grid;
+  gap: 0.56rem;
+  min-width: 0;
   border: 1px solid var(--line);
   border-radius: 8px;
-  padding: 0.85rem;
+  padding: 0.72rem;
   background: var(--panel-soft);
 }
 
+.data-panel-list-block {
+  background: #ffffff;
+}
+
+.data-section-label {
+  margin: 0;
+}
+
+.dataset-upload-form {
+  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
+  align-items: end;
+  border: 0;
+  padding: 0;
+  background: transparent;
+}
+
 .dataset-upload-form label,
 .file-input-label {
   min-width: 0;