diff --git a/src/app/shared/nodes/generic-node/generic-node.css b/src/app/shared/nodes/generic-node/generic-node.css
index 4863ea5..9add75f 100644
--- a/src/app/shared/nodes/generic-node/generic-node.css
+++ b/src/app/shared/nodes/generic-node/generic-node.css
@@ -796,10 +796,9 @@
 
 .llm-params {
   margin: 0 12px 12px;
-  padding: 10px;
-  border: 1px solid #e2e8f0;
-  border-radius: 10px;
-  background: #f8fafc;
+  padding: 0;
+  border: none;
+  background: transparent;
   display: flex;
   flex-direction: column;
   gap: 8px;
@@ -815,7 +814,7 @@
 .llm-param-grid {
   display: grid;
   grid-template-columns: 1fr 1fr;
-  gap: 6px;
+  gap: 8px;
 }
 
 .llm-param-groups {
@@ -826,15 +825,15 @@
 
 .llm-param-fieldset {
   margin: 0;
-  padding: 8px;
-  border: 1px solid #cbd5e1;
-  border-radius: 0;
-  background: transparent;
+  padding: 10px;
+  border: 1px solid #e6ecf4;
+  border-radius: 12px;
+  background: #fbfdff;
 }
 
 .llm-param-legend {
   margin: 0;
-  padding: 0 4px;
+  padding: 0 6px;
   font-size: 10px;
   font-weight: 700;
   color: #475569;
@@ -863,14 +862,21 @@
 }
 
 .llm-param-chip {
-  border: 1px solid #dbeafe;
-  background: #eff6ff;
-  border-radius: 8px;
-  padding: 6px 8px;
+  position: relative;
+  border: 1px solid #e6ecf4;
+  background: #ffffff;
+  border-radius: 10px;
+  padding: 7px 10px;
   display: flex;
   flex-direction: column;
   min-width: 0;
   overflow: hidden;
+  transition: border-color 0.15s ease, box-shadow 0.15s ease;
+}
+
+.llm-param-chip:hover {
+  border-color: #c7d9f2;
+  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
 }
 
 .llm-param-chip-root {
@@ -898,29 +904,32 @@
   min-width: 0;
 }
 
+/* Quiet until the field is pointed at, so a form of many fields is not a wall of pencils. */
 .llm-edit-btn {
   border: none;
   background: transparent;
-  color: #64748b;
-  border-radius: 999px;
-  width: 18px;
-  height: 18px;
+  color: #94a3b8;
+  border-radius: 7px;
+  width: 22px;
+  height: 22px;
+  font-size: 11px;
   display: inline-flex;
   align-items: center;
   justify-content: center;
   cursor: pointer;
   flex-shrink: 0;
-  transition: color 0.15s ease, background-color 0.15s ease, transform 0.15s ease;
+  opacity: 0;
+  transition: color 0.15s ease, background-color 0.15s ease, opacity 0.15s ease;
+}
+
+.llm-param-chip:hover .llm-edit-btn,
+.llm-edit-btn:focus-visible {
+  opacity: 1;
 }
 
 .llm-edit-btn:hover {
-  color: #2563eb;
-  background: rgba(37, 99, 235, 0.1);
-  transform: translateY(-1px);
-}
-
-.llm-edit-btn:active {
-  transform: translateY(0);
+  color: #1d4ed8;
+  background: #eff6ff;
 }
 
 .llm-edit-btn:disabled {
@@ -933,9 +942,10 @@
   position: relative;
   width: 34px;
   height: 20px;
-  border: 1px solid #bfdbfe;
+  border: 1px solid #dbe2ea;
   border-radius: 999px;
-  background: #dbeafe;
+  background: #eef2f7;
+  cursor: pointer;
   transition: background-color 0.15s ease, border-color 0.15s ease;
 }
 
diff --git a/src/app/shared/nodes/node-parameters/node-parameters.html b/src/app/shared/nodes/node-parameters/node-parameters.html
index 2c18cd5..a554636 100644
--- a/src/app/shared/nodes/node-parameters/node-parameters.html
+++ b/src/app/shared/nodes/node-parameters/node-parameters.html
@@ -62,7 +62,9 @@
             }
           </div>
           @if (field.type !== 'boolean') {
-          <span class="llm-param-value" [class.llm-param-value-clamped]="field.expandable">{{ field.value }}</span>
+          <span class="llm-param-value" [class.llm-param-value-choice]="field.choice"
+            [class.llm-param-value-empty]="!field.value || field.value === '-'"
+            [class.llm-param-value-clamped]="field.expandable">{{ shownValue(field) }}</span>
           }
         </div>
         } @else {
@@ -171,7 +173,9 @@
         }
       </div>
       @if (field.type !== 'boolean') {
-      <span class="llm-param-value" [class.llm-param-value-clamped]="field.expandable">{{ field.value }}</span>
+      <span class="llm-param-value" [class.llm-param-value-choice]="field.choice"
+            [class.llm-param-value-empty]="!field.value || field.value === '-'"
+            [class.llm-param-value-clamped]="field.expandable">{{ shownValue(field) }}</span>
       }
     </div>
     } @else {
@@ -337,7 +341,7 @@
       <select [(ngModel)]="host.localEditorValue" (pointerdown)="$event.stopPropagation()">
         <option value="">{{ host.localEditorOptions.length ? ('Select ' + (host.localEditorLabel | lowercase) + '...') : 'No options available' }}</option>
         @for (option of host.localEditorOptions; track option.value) {
-        <option [value]="option.value">{{ option.label }}</option>
+        <option [value]="option.value">{{ optionLabel(option) }}</option>
         }
       </select>
       } @else {
diff --git a/src/app/shared/nodes/node-parameters/node-parameters.ts b/src/app/shared/nodes/node-parameters/node-parameters.ts
index eb06b86..1e4ce68 100644
--- a/src/app/shared/nodes/node-parameters/node-parameters.ts
+++ b/src/app/shared/nodes/node-parameters/node-parameters.ts
@@ -6,6 +6,7 @@ import { CommonModule } from '@angular/common';
 import { Component, effect, ElementRef, Input, viewChild } from '@angular/core';
 import { FormsModule } from '@angular/forms';
 import { NodeListFieldComponent } from '../node-list-field/node-list-field';
+import { humanizeChoice } from '../node-utility';
 
 /**
  * What a node shows of its configuration, built from its schema: the same fields whatever kind of
@@ -95,6 +96,16 @@ export class NodeParametersComponent {
     });
   }
 
+  /** A field's value as shown: a fixed choice in words, anything else as written. */
+  shownValue(field: { value: string; choice?: boolean }): string {
+    return field.choice ? humanizeChoice(field.value) : field.value;
+  }
+
+  /** An option of a fixed choice in words, when it has no label of its own. */
+  optionLabel(option: { value: unknown; label: string }): string {
+    return option.label === String(option.value) ? humanizeChoice(option.label) : option.label;
+  }
+
   onSimpleEditorDialogClick(event: MouseEvent) {
     if (event.target === this.simpleEditorDialog()?.nativeElement) {
       this.host.closeSimpleParamEditor(event);
diff --git a/src/app/shared/nodes/node-utility.spec.ts b/src/app/shared/nodes/node-utility.spec.ts
index cb26a6e..bfa7f91 100644
--- a/src/app/shared/nodes/node-utility.spec.ts
+++ b/src/app/shared/nodes/node-utility.spec.ts
@@ -16,7 +16,8 @@ import {
   getValueByPath,
   toStringOrNull,
   valueToDisplayString,
-  resolveStepIcon
+  resolveStepIcon,
+  humanizeChoice
 } from './node-utility';
 
 describe('node-utility', () => {
@@ -253,3 +254,14 @@ describe('resolveStepIcon', () => {
     expect(resolveStepIcon({ 'x-ui-icon': 'bi bi-robot' }, false, { visualRole: 'ACTIVITY' }).value).toBe('bi bi-robot');
   });
 });
+
+describe('humanizeChoice', () => {
+  it('reads a fixed choice as words, and leaves anything else as it was written', () => {
+    expect(humanizeChoice('PER_EXECUTION')).toBe('Per execution');
+    expect(humanizeChoice('CATALOG')).toBe('Catalog');
+    expect(humanizeChoice('notes/*.txt')).toBe('notes/*.txt');
+    expect(humanizeChoice('gemma:7b')).toBe('gemma:7b');
+    expect(humanizeChoice('Already words')).toBe('Already words');
+    expect(humanizeChoice('')).toBe('');
+  });
+});
diff --git a/src/app/shared/nodes/node-utility.ts b/src/app/shared/nodes/node-utility.ts
index 8303d60..fde9c26 100644
--- a/src/app/shared/nodes/node-utility.ts
+++ b/src/app/shared/nodes/node-utility.ts
@@ -433,6 +433,16 @@ export function resolveStepIcon(
   return { type: 'class', value: 'bi bi-stars' };
 }
 
+/**
+ * PER_EXECUTION as "Per execution": a fixed choice shown in words. Only values that look like a
+ * constant are changed - anything else is shown as it was written.
+ */
+export function humanizeChoice(value: string): string {
+  if (!/^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$/.test(value)) return value;
+  const words = value.toLowerCase().split('_').join(' ');
+  return words.charAt(0).toUpperCase() + words.slice(1);
+}
+
 export function splitTemplatedTextParts(text: string | null): TemplatedTextPart[] {
   if (!text) return [];
 
diff --git a/src/app/shared/nodes/schema-driven-fields.ts b/src/app/shared/nodes/schema-driven-fields.ts
index 9324ab6..d4b8078 100644
--- a/src/app/shared/nodes/schema-driven-fields.ts
+++ b/src/app/shared/nodes/schema-driven-fields.ts
@@ -104,6 +104,8 @@ export type SchemaParameterFieldView<TType = SchemaFieldType> = {
   enabled: boolean;
   type: TType;
   booleanValue: boolean;
+  /** One of a fixed set of values, which a person reads better as words than as a constant. */
+  choice?: boolean;
 };
 
 export type SchemaRichContentFieldView = {
@@ -802,7 +804,8 @@ export function buildSchemaFieldViewModel<
         expandable: isLongTextValue(value),
         enabled: params.isPathEnabled(definition.path, params.config),
         type: definition.type,
-        booleanValue: getValueByPath(params.config, definition.path) === true
+        booleanValue: getValueByPath(params.config, definition.path) === true,
+        choice: ((definition as { enumOptions?: unknown[] }).enumOptions?.length ?? 0) > 0
       } satisfies SchemaParameterFieldView<TType>;
     });
 
diff --git a/src/styles.css b/src/styles.css
index 448af17..040e66c 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -194,44 +194,63 @@ body.node-focus-modal-open {
 }
 
 .llm-modal {
-  width: min(360px, calc(100vw - 24px));
+  width: min(400px, calc(100vw - 24px));
   display: flex;
   flex-direction: column;
-  gap: 10px;
-  border: 1px solid #dbe2ea;
-  border-radius: 12px;
+  gap: 14px;
+  border: 1px solid #e6ecf4;
+  border-radius: 16px;
   background: #ffffff;
-  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.25);
-  padding: 14px;
+  box-shadow: 0 24px 56px rgba(15, 23, 42, 0.22);
+  padding: 18px;
 }
 
 .llm-modal-title {
-  font-size: 13px;
-  font-weight: 700;
+  font-size: 15px;
+  font-weight: 600;
   color: #0f172a;
 }
 
 .llm-modal-field {
   display: flex;
   flex-direction: column;
-  gap: 4px;
+  gap: 6px;
 }
 
 .llm-modal-field label {
-  font-size: 11px;
+  font-size: 9.5px;
   font-weight: 600;
-  color: #475569;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  color: #94a3b8;
 }
 
 .llm-modal-field input,
 .llm-modal-field select,
 .llm-modal-field textarea {
-  border: 1px solid #cbd5e1;
-  border-radius: 8px;
-  font-size: 12px;
+  border: 1px solid #dbe2ea;
+  border-radius: 10px;
+  font-size: 13px;
   color: #0f172a;
-  padding: 7px 8px;
+  background: #fbfdff;
+  padding: 9px 11px;
   resize: vertical;
+  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
+}
+
+.llm-modal-field input:hover,
+.llm-modal-field select:hover,
+.llm-modal-field textarea:hover {
+  border-color: #c7d9f2;
+}
+
+.llm-modal-field input:focus,
+.llm-modal-field select:focus,
+.llm-modal-field textarea:focus {
+  outline: none;
+  background: #ffffff;
+  border-color: #2563eb;
+  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
 }
 
 /* Why the value cannot be saved, under the input it belongs to. */
@@ -279,24 +298,34 @@ body.node-focus-modal-open {
 
 .llm-btn {
   border: 1px solid transparent;
-  border-radius: 8px;
+  border-radius: 9px;
   cursor: pointer;
-  font-size: 12px;
+  font-size: 12.5px;
   font-weight: 600;
-  padding: 6px 10px;
+  padding: 8px 14px;
+  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
 }
 
 .llm-btn-ghost {
-  border-color: #cbd5e1;
+  border-color: #dbe2ea;
   color: #475569;
   background: #ffffff;
 }
 
+.llm-btn-ghost:hover:not(:disabled) {
+  border-color: #cbd5e1;
+  background: #f8fafc;
+}
+
 .llm-btn-primary {
   background: #2563eb;
   color: #ffffff;
 }
 
+.llm-btn-primary:hover:not(:disabled) {
+  background: #1d4ed8;
+}
+
 .node-toggle {
   width: fit-content;
   display: inline-flex;
@@ -514,20 +543,43 @@ body.node-focus-modal-open {
 }
 
 .llm-param-key {
-  color: #64748b;
-  font-size: 10px;
-  letter-spacing: 0.03em;
+  color: #94a3b8;
+  font-size: 9.5px;
+  font-weight: 600;
+  letter-spacing: 0.06em;
   text-transform: uppercase;
 }
 
 .llm-param-value {
+  margin-top: 1px;
   color: #0f172a;
-  font-size: 11px;
+  font-size: 12px;
+  font-weight: 500;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
+/* One of a fixed set: a word on a tinted plate, so it reads as a choice and not as typed text. */
+.llm-param-value-choice {
+  align-self: flex-start;
+  max-width: 100%;
+  margin-top: 3px;
+  padding: 1px 8px;
+  border-radius: 999px;
+  background: #eef2ff;
+  color: #3730a3;
+  font-size: 11px;
+  font-weight: 600;
+}
+
+/* Nothing set yet: said in words rather than with a bare dash. */
+.llm-param-value-empty {
+  color: #b6c0cd;
+  font-weight: 400;
+  font-style: italic;
+}
+
 .llm-array-sections {
   display: flex;
   flex-direction: column;