improve calendar

static/app.css

@@ -656,7 +656,7 @@ footer {
   border: 1px solid #ddd;
   border-top: 0;
   border-radius: 0 0 6px 6px;
-  overflow: hidden;
+  overflow: visible;
 }
 
 .calendar-weekday-header {
@@ -712,6 +712,11 @@ footer {
   border-bottom: none;
 }
 
+.calendar-day-hidden {
+  visibility: hidden;
+  pointer-events: none;
+}
+
 @media (min-width: 992px) {
   .calendar-grid {
     grid-template-columns: repeat(7, minmax(0, 1fr));
@@ -727,7 +732,12 @@ footer {
     border: 1px solid #ddd;
     border-bottom: 0;
     border-radius: 8px 8px 0 0;
-    overflow: hidden;
+    overflow: visible;
+    position: sticky;
+    top: 70px;
+    z-index: 900;
+    background: var(--card-background, #fff);
+    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
   }
 
   .calendar-day {

templates/calendar_section.html

@@ -24,15 +24,7 @@
       </div>
     </div>
 
-    <div class="calendar-weekday-header">
+    <div class="calendar-weekday-header"></div>
-      <div>Mo</div>
-      <div>Di</div>
-      <div>Mi</div>
-      <div>Do</div>
-      <div>Fr</div>
-      <div>Sa</div>
-      <div>So</div>
-    </div>
 
     <div id="calendar-days" class="calendar-grid">
       <!-- Populated via inline script below -->
@@ -61,6 +53,15 @@
               <input type="time" class="form-control" id="calendarTime">
             </div>
           </div>
+          {% if admin_enabled %}
+          <div class="row g-3 mt-1" id="calendarRecurrenceRow">
+            <div class="col-md-6">
+              <label for="calendarRepeatCount" class="form-label">Wöchentliche Wiederholung</label>
+              <input type="number" class="form-control" id="calendarRepeatCount" min="1" max="52" step="1" value="1">
+              <div class="form-text">Legt einzelne wöchentliche Termine an (für Nachbearbeitung).</div>
+            </div>
+          </div>
+          {% endif %}
           <div class="mt-3">
             <label for="calendarTitle" class="form-label">Titel</label>
             <input type="text" class="form-control" id="calendarTitle" required>
@@ -148,18 +149,40 @@
     return holidays.get(toLocalISO(date)) || '';
   }
 
+  function isDesktopView() {
+    return window.matchMedia && window.matchMedia('(min-width: 992px)').matches;
+  }
+
   function getCalendarRange() {
     const weeks = window._calendarIsAdmin ? 12 : 4;
     const start = new Date();
     start.setHours(0, 0, 0, 0);
+
+    if (isDesktopView()) {
       // shift back to Monday (0 = Sunday)
       const diffToMonday = (start.getDay() + 6) % 7;
       start.setDate(start.getDate() - diffToMonday);
+    }
+
     const end = new Date(start);
     end.setDate(end.getDate() + (weeks * 7) - 1);
     return { start, end };
   }
 
+  function renderWeekdayHeader(startDate) {
+    const header = document.querySelector('.calendar-weekday-header');
+    if (!header) return;
+    header.innerHTML = '';
+    const formatDayShort = new Intl.DateTimeFormat('de-DE', { weekday: 'short' });
+    for (let i = 0; i < 7; i++) {
+      const d = new Date(startDate);
+      d.setDate(startDate.getDate() + i);
+      const div = document.createElement('div');
+      div.textContent = formatDayShort.format(d);
+      header.appendChild(div);
+    }
+  }
+
   (function renderInitialCalendarRange() {
     const daysContainer = document.getElementById('calendar-days');
     if (!daysContainer || daysContainer.childElementCount > 0) return;
@@ -172,6 +195,8 @@
     const formatDayName = new Intl.DateTimeFormat('de-DE', { weekday: 'long' });
     const formatDate = new Intl.DateTimeFormat('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric' });
     const { start, end } = getCalendarRange();
+    const todayIso = toLocalISO(new Date());
+    renderWeekdayHeader(start);
     const dayCount = Math.round((end - start) / (1000 * 60 * 60 * 24)) + 1;
 
     for (let i = 0; i < dayCount; i++) {
@@ -194,6 +219,9 @@
       if (holidayName) {
         dayBlock.classList.add('calendar-day-holiday');
       }
+      if (isDesktopView() && isoDate < todayIso) {
+        dayBlock.classList.add('calendar-day-hidden');
+      }
 
       dayBlock.innerHTML = `
         <div class="calendar-day-header">
@@ -435,6 +463,22 @@
     return response.json();
   }
 
+  async function createRecurringEntries(entry, repeatCount) {
+    const count = Math.max(1, Math.min(52, repeatCount || 1));
+    const baseDate = entry.date;
+    if (!baseDate) return [];
+    const base = new Date(baseDate);
+    const savedEntries = [];
+    for (let i = 0; i < count; i++) {
+      const next = new Date(base);
+      next.setDate(base.getDate() + i * 7);
+      const entryForWeek = { ...entry, date: toLocalISO(next) };
+      const saved = await saveCalendarEntry(entryForWeek);
+      savedEntries.push(saved);
+    }
+    return savedEntries;
+  }
+
   async function deleteCalendarEntry(id) {
     const response = await fetch(`/api/calendar/${id}`, { method: 'DELETE' });
     if (!response.ok) {
@@ -490,12 +534,22 @@
     const form = document.getElementById('calendarForm');
     const daysContainer = document.getElementById('calendar-days');
     const locationFilter = document.getElementById('calendar-location-filter');
+    const repeatCountInput = document.getElementById('calendarRepeatCount');
+    const recurrenceRow = document.getElementById('calendarRecurrenceRow');
     const calendarModal = modalEl && window.bootstrap ? new bootstrap.Modal(modalEl) : null;
     if (calendarModal) {
       window.calendarModal = calendarModal;
     }
     let calendarHasLoaded = false;
 
+    const setRecurrenceMode = (isEditing) => {
+      if (!recurrenceRow) return;
+      recurrenceRow.style.display = isEditing ? 'none' : '';
+      if (!isEditing && repeatCountInput) {
+        repeatCountInput.value = '1';
+      }
+    };
+
     if (addBtn && calendarModal) {
       addBtn.addEventListener('click', () => {
         if (form) form.reset();
@@ -507,6 +561,7 @@
         const idInput = document.getElementById('calendarEntryId');
         if (idInput) idInput.value = '';
 
+        setRecurrenceMode(false);
         calendarModal.show();
       });
     }
@@ -523,14 +578,24 @@
           location: document.getElementById('calendarLocation')?.value,
           details: document.getElementById('calendarDetails')?.value
         };
+        const isEditing = Boolean(entry.id);
+        const repeatCount = (!isEditing && window._calendarIsAdmin && repeatCountInput)
+          ? Math.max(1, Math.min(52, parseInt(repeatCountInput.value, 10) || 1))
+          : 1;
 
         try {
-          if (entry.id) {
+          if (isEditing) {
             removeCalendarEntryFromUI(entry.id);
-          }
             const saved = await saveCalendarEntry(entry);
             addLocationOption(saved.location);
             addCalendarEntry(saved);
+          } else {
+            const savedEntries = await createRecurringEntries(entry, repeatCount);
+            savedEntries.forEach(saved => {
+              addLocationOption(saved.location);
+              addCalendarEntry(saved);
+            });
+          }
           calendarModal.hide();
         } catch (err) {
           console.error(err);
@@ -603,6 +668,7 @@
           document.getElementById('calendarTitle').value = entry.title || '';
           document.getElementById('calendarLocation').value = entry.location || '';
           document.getElementById('calendarDetails').value = entry.details || '';
+          setRecurrenceMode(true);
           if (calendarModal) calendarModal.show();
           return;
         }