feat: refactor TrainingUnitSectionsEditor and enhance TrainingPlanningPage layout

- Replaced the tu-ex-run-block with a new tu-ex-debrief layout using CSS Grid for improved structure and responsiveness.
- Updated the TrainingUnitSectionsEditor component to utilize the new layout, enhancing the user experience for inputting modifications and actual durations.
- Introduced a sectionsEditMode state in TrainingPlanningPage to manage different editing modes (planning, refine, debrief) for better user guidance.
- Adjusted the visibility of execution extras based on the current editing mode, streamlining the interface for users.

frontend/src/app.css

@@ -3445,22 +3445,60 @@ a.analysis-split__nav-item {
   white-space: nowrap;
 }
 
-.tu-ex-run-block {
-  display: block;
+.tu-ex-debrief {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) 4.75rem;
+  gap: 10px 14px;
+  align-items: start;
   width: 100%;
   margin-top: 10px;
-  font-size: 0.78rem;
+  padding-top: 10px;
+  border-top: 1px solid var(--border2, rgba(0, 0, 0, 0.08));
+  box-sizing: border-box;
 }
 
-.tu-ex-run-block__controls {
+.tu-ex-debrief__grow {
+  min-width: 0;
   display: flex;
   flex-direction: column;
-  gap: 6px;
-  margin-top: 5px;
+  gap: 5px;
 }
 
-.tu-ex-run-block__controls .form-input:first-of-type {
-  max-width: 120px;
+.tu-ex-debrief__textarea {
+  width: 100%;
+  max-width: 100%;
+  box-sizing: border-box;
+  min-height: 4.75rem;
+  resize: vertical;
+  font-size: 0.88rem;
+  line-height: 1.45;
+}
+
+.tu-ex-debrief__ist {
+  display: flex;
+  flex-direction: column;
+  gap: 5px;
+  align-items: stretch;
+  justify-self: end;
+  width: 4.75rem;
+  flex-shrink: 0;
+}
+
+.tu-ex-debrief__ist .tu-ex-duration {
+  width: 100%;
+  margin: 0;
+}
+
+@media (max-width: 520px) {
+  .tu-ex-debrief {
+    grid-template-columns: 1fr;
+  }
+
+  .tu-ex-debrief__ist {
+    width: 100%;
+    max-width: 10rem;
+    justify-self: start;
+  }
 }
 
 .tu-textedit-backdrop {

frontend/src/components/TrainingUnitSectionsEditor.jsx

@@ -763,30 +763,34 @@ export default function TrainingUnitSectionsEditor({
                     </div>
 
                     {showExecutionExtras ? (
-                      <label className="tu-ex-run-block form-label">
-                        Ist-Dauer / Anpassungen
-                        <span className="tu-ex-run-block__controls">
+                      <div className="tu-ex-debrief">
+                        <div className="tu-ex-debrief__grow">
+                          <span className="tu-item-row__meta-label">Abweichungen beim Durchführen</span>
+                          <textarea
+                            className="form-input tu-ex-debrief__textarea"
+                            rows={3}
+                            value={it.modifications || ''}
+                            onChange={(e) =>
+                              updateItem(sIdx, iIdx, 'modifications', e.target.value)
+                            }
+                            placeholder="Was lief anders? Anpassungen für spätere Planung…"
+                          />
+                        </div>
+                        <div className="tu-ex-debrief__ist">
+                          <span className="tu-item-row__meta-label">Ist (Min)</span>
                           <input
                             type="number"
-                            className="form-input"
+                            className="form-input tu-ex-duration"
                             min={1}
                             value={it.actual_duration_min}
                             onChange={(e) =>
                               updateItem(sIdx, iIdx, 'actual_duration_min', e.target.value)
                             }
-                            placeholder="IST min"
+                            placeholder="IST"
+                            title="Tatsächliche Dauer (Minuten); dieselbe Spaltenbreite wie „Min“ (Plan) oben"
                           />
-                          <textarea
-                            className="form-input"
-                            rows={2}
-                            value={it.modifications || ''}
-                            onChange={(e) =>
-                              updateItem(sIdx, iIdx, 'modifications', e.target.value)
-                            }
-                            placeholder="Abweichungen beim Durchführen"
-                          />
-                        </span>
-                      </label>
+                        </div>
+                      </div>
                     ) : null}
                   </div>
                 )

frontend/src/pages/TrainingPlanningPage.jsx

@@ -118,6 +118,8 @@ function TrainingPlanningPage() {
   const [loading, setLoading] = useState(true)
   const [showModal, setShowModal] = useState(false)
   const [editingUnit, setEditingUnit] = useState(null)
+  /** Abschnitts-Editor: Planung / strukturelle Überarbeitung (ohne Ist-Felder) / Nachbereitung (Ist & Abweichungen) */
+  const [sectionsEditMode, setSectionsEditMode] = useState('planning')
   const [draftPlanTemplateId, setDraftPlanTemplateId] = useState('')
   const [quickTemplateId, setQuickTemplateId] = useState('')
   const [exercisePickerOpen, setExercisePickerOpen] = useState(false)
@@ -505,6 +507,7 @@ function TrainingPlanningPage() {
       sections: [defaultSection('Hauptteil')],
       ...sessionAssignDefaults()
     })
+    setSectionsEditMode('planning')
     setShowModal(true)
   }
 
@@ -532,6 +535,7 @@ function TrainingPlanningPage() {
       sections: [defaultSection('Hauptteil')],
       ...sessionAssignDefaults()
     })
+    setSectionsEditMode('planning')
     setShowModal(true)
   }
 
@@ -593,6 +597,7 @@ function TrainingPlanningPage() {
           return xs
         })(),
       })
+      setSectionsEditMode(fullUnit.status === 'completed' ? 'debrief' : 'planning')
       setShowModal(true)
     } catch (err) {
       alert('Fehler beim Laden: ' + err.message)
@@ -2254,6 +2259,67 @@ function TrainingPlanningPage() {
                 </div>
 
                 <div style={{ marginTop: '2rem' }}>
+                {editingUnit ? (
+                  <div style={{ marginBottom: '1rem' }}>
+                    <div
+                      role="radiogroup"
+                      aria-label="Modus für Abschnitte und Übungen"
+                      style={{
+                        display: 'flex',
+                        flexWrap: 'wrap',
+                        alignItems: 'center',
+                        gap: '10px',
+                      }}
+                    >
+                      <span className="form-label" style={{ marginBottom: 0, fontSize: '0.82rem' }}>
+                        Ablauf bearbeiten als
+                      </span>
+                      <div
+                        style={{
+                          display: 'inline-flex',
+                          borderRadius: '10px',
+                          border: '1.5px solid var(--border2)',
+                          overflow: 'hidden',
+                          background: 'var(--surface2)',
+                        }}
+                      >
+                        {[
+                          { id: 'planning', label: 'Planung' },
+                          { id: 'refine', label: 'Überarbeiten' },
+                          { id: 'debrief', label: 'Nachbereitung' },
+                        ].map((opt, i) => (
+                          <button
+                            key={opt.id}
+                            type="button"
+                            role="radio"
+                            aria-checked={sectionsEditMode === opt.id}
+                            onClick={() => setSectionsEditMode(opt.id)}
+                            style={{
+                              border: 'none',
+                              padding: '8px 14px',
+                              fontWeight: 600,
+                              fontSize: '0.85rem',
+                              cursor: 'pointer',
+                              background: sectionsEditMode === opt.id ? 'var(--accent-dark)' : 'transparent',
+                              color: sectionsEditMode === opt.id ? '#fff' : 'var(--text1)',
+                              whiteSpace: 'nowrap',
+                              ...(i > 0 ? { borderLeft: '1.5px solid var(--border2)' } : {}),
+                            }}
+                          >
+                            {opt.label}
+                          </button>
+                        ))}
+                      </div>
+                    </div>
+                    <p style={{ margin: '0.35rem 0 0', fontSize: '0.82rem', color: 'var(--text3)', lineHeight: 1.45 }}>
+                      {sectionsEditMode === 'debrief'
+                        ? 'Ist‑Minuten rechts in derselben Spaltenbreite wie „Min“ (Plan); Abweichungen als Text über die volle Breite.'
+                        : sectionsEditMode === 'refine'
+                          ? 'Struktur, Übungen und geplante Zeiten anpassen — ohne Ist‑Angaben in den Zeilen (wie Planung).'
+                          : 'Ablauf und geplante Minuten bearbeiten. Ist‑Werte und Abweichungen nur unter „Nachbereitung“.'}
+                    </p>
+                  </div>
+                ) : null}
                 <TrainingUnitSectionsEditor
                   heading="Abschnitte & Übungen"
                   headingAccessory={
@@ -2279,7 +2345,7 @@ function TrainingPlanningPage() {
                   onPeekExercise={(id, variantId) =>
                     setPlanningPeekCtx({ exerciseId: id, variantId: variantId ?? null })
                   }
-                  showExecutionExtras={!!editingUnit}
+                  showExecutionExtras={Boolean(editingUnit) && sectionsEditMode === 'debrief'}
                 />
                 </div>