diff --git a/lib/view/pages/timetable/widgets/calendar/day_header.dart b/lib/view/pages/timetable/widgets/calendar/day_header.dart
index 57cb421..0d6545d 100644
--- a/lib/view/pages/timetable/widgets/calendar/day_header.dart
+++ b/lib/view/pages/timetable/widgets/calendar/day_header.dart
@@ -13,17 +13,19 @@ class _DayHeaderStrip extends StatelessWidget {
   });
 
   @override
-  Widget build(BuildContext context) => Row(
-    children: [
-      SizedBox(width: rulerWidth),
-      for (var d = 0; d < 5; d++)
-        Expanded(
-          child: _DayHeaderCell(
-            date: weekStart.addDays(d),
-            today: today,
+  // Fixed-height strip with a 28px day circle: unclamped accessibility
+  // sizes overflow it.
+  Widget build(BuildContext context) => MediaQuery.withClampedTextScaling(
+    maxScaleFactor: 1.3,
+    child: Row(
+      children: [
+        SizedBox(width: rulerWidth),
+        for (var d = 0; d < 5; d++)
+          Expanded(
+            child: _DayHeaderCell(date: weekStart.addDays(d), today: today),
           ),
-        ),
-    ],
+      ],
+    ),
   );
 }
 
diff --git a/lib/view/pages/timetable/widgets/calendar/week_grid.dart b/lib/view/pages/timetable/widgets/calendar/week_grid.dart
index e2c6e0e..7e36196 100644
--- a/lib/view/pages/timetable/widgets/calendar/week_grid.dart
+++ b/lib/view/pages/timetable/widgets/calendar/week_grid.dart
@@ -95,20 +95,24 @@ class _PeriodRuler extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
-    return SizedBox(
-      width: width,
-      child: Stack(
-        clipBehavior: Clip.none,
-        children: [
-          for (final period in schedule.periods)
-            Positioned(
-              top: layout.topOf(period),
-              height: layout.heightOf(period),
-              left: 0,
-              right: 0,
-              child: _PeriodLabel(period: period, theme: theme),
-            ),
-        ],
+    // Fixed ruler width and period heights: past this the labels overlap.
+    return MediaQuery.withClampedTextScaling(
+      maxScaleFactor: 1.3,
+      child: SizedBox(
+        width: width,
+        child: Stack(
+          clipBehavior: Clip.none,
+          children: [
+            for (final period in schedule.periods)
+              Positioned(
+                top: layout.topOf(period),
+                height: layout.heightOf(period),
+                left: 0,
+                right: 0,
+                child: _PeriodLabel(period: period, theme: theme),
+              ),
+          ],
+        ),
       ),
     );
   }
@@ -155,7 +159,11 @@ class _PeriodLabel extends StatelessWidget {
 
     return LayoutBuilder(
       builder: (context, constraints) {
-        final showTimes = constraints.maxHeight >= 38;
+        // Both times plus the number, at the current text scale (9 + 9 + 14
+        // plus the 3px insets and some air — 38px at scale 1).
+        final scaler = MediaQuery.textScalerOf(context);
+        final needed = 2 * scaler.scale(9) + scaler.scale(14) + 6;
+        final showTimes = constraints.maxHeight >= needed;
         return DecoratedBox(
           decoration: BoxDecoration(
             border: Border(top: BorderSide(color: dividerColor, width: 0.5)),
@@ -169,11 +177,10 @@ class _PeriodLabel extends StatelessWidget {
                   top: 3,
                   left: 0,
                   right: 0,
-                  child: Text(
+                  child: _timeText(
                     _format(period.start),
-                    style: timeStyle,
-                    textAlign: TextAlign.center,
-                    textHeightBehavior: tightTextHeight,
+                    timeStyle,
+                    tightTextHeight,
                   ),
                 ),
               Text(
@@ -191,11 +198,10 @@ class _PeriodLabel extends StatelessWidget {
                   bottom: 3,
                   left: 0,
                   right: 0,
-                  child: Text(
+                  child: _timeText(
                     _format(period.end),
-                    style: timeStyle,
-                    textAlign: TextAlign.center,
-                    textHeightBehavior: tightTextHeight,
+                    timeStyle,
+                    tightTextHeight,
                   ),
                 ),
             ],
@@ -205,6 +211,24 @@ class _PeriodLabel extends StatelessWidget {
     );
   }
 
+  /// The ruler is narrow: a scaled-up time must shrink, never wrap into the
+  /// period number.
+  static Widget _timeText(
+    String text,
+    TextStyle? style,
+    TextHeightBehavior heightBehavior,
+  ) => FittedBox(
+    fit: BoxFit.scaleDown,
+    child: Text(
+      text,
+      style: style,
+      maxLines: 1,
+      softWrap: false,
+      textAlign: TextAlign.center,
+      textHeightBehavior: heightBehavior,
+    ),
+  );
+
   static String _format(TimeOfDay t) =>
       '${t.hour.toString().padLeft(2, '0')}:${t.minute.toString().padLeft(2, '0')}';
 }