diff --git a/frontend/src/components/calendar/CalendarPage.tsx b/frontend/src/components/calendar/CalendarPage.tsx
index c1cef0f..51262e8 100644
--- a/frontend/src/components/calendar/CalendarPage.tsx
+++ b/frontend/src/components/calendar/CalendarPage.tsx
@@ -8,7 +8,7 @@ import dayGridPlugin from '@fullcalendar/daygrid';
 import timeGridPlugin from '@fullcalendar/timegrid';
 import interactionPlugin from '@fullcalendar/interaction';
 import type { EventClickArg, DateSelectArg, EventDropArg, DatesSetArg } from '@fullcalendar/core';
-import { ChevronLeft, ChevronRight, Plus, Search } from 'lucide-react';
+import { ChevronLeft, ChevronRight, PanelLeft, Plus, Search } from 'lucide-react';
 import api, { getErrorMessage } from '@/lib/api';
 import axios from 'axios';
 import type { CalendarEvent, EventTemplate, Location as LocationType, CalendarPermission } from '@/types';
@@ -17,6 +17,7 @@ import { useSettings } from '@/hooks/useSettings';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
 import { Select } from '@/components/ui/select';
+import { Sheet, SheetContent } from '@/components/ui/sheet';
 import CalendarSidebar from './CalendarSidebar';
 import EventDetailPanel from './EventDetailPanel';
 import type { CreateDefaults } from './EventDetailPanel';
@@ -164,6 +165,8 @@ export default function CalendarPage() {
 
   // Track desktop breakpoint to prevent dual EventDetailPanel mount
   const isDesktop = useMediaQuery('(min-width: 1024px)');
+  const isMobile = useMediaQuery('(max-width: 1023px)');
+  const [mobileSidebarOpen, setMobileSidebarOpen] = useState(false);
 
   // Continuously resize calendar during panel open/close CSS transition
   useEffect(() => {
@@ -471,15 +474,28 @@ export default function CalendarPage() {
 
   return (
     <div className="flex h-full overflow-hidden animate-fade-in">
-      <CalendarSidebar ref={sidebarRef} onUseTemplate={handleUseTemplate} onSharedVisibilityChange={setVisibleSharedIds} width={sidebarWidth} />
-      <div
-        onMouseDown={handleSidebarMouseDown}
-        className="w-1 shrink-0 cursor-col-resize hover:bg-accent/30 active:bg-accent/50 transition-colors duration-150"
-      />
+      <div className="hidden lg:flex lg:flex-row shrink-0">
+        <CalendarSidebar ref={sidebarRef} onUseTemplate={handleUseTemplate} onSharedVisibilityChange={setVisibleSharedIds} width={sidebarWidth} />
+        <div
+          onMouseDown={handleSidebarMouseDown}
+          className="w-1 shrink-0 cursor-col-resize hover:bg-accent/30 active:bg-accent/50 transition-colors duration-150"
+        />
+      </div>
+
+      {isMobile && (
+        <Sheet open={mobileSidebarOpen} onOpenChange={setMobileSidebarOpen}>
+          <SheetContent className="w-72 p-0">
+            <CalendarSidebar onUseTemplate={(tmpl) => { setMobileSidebarOpen(false); handleUseTemplate(tmpl); }} onSharedVisibilityChange={setVisibleSharedIds} width={288} />
+          </SheetContent>
+        </Sheet>
+      )}
 
       <div ref={calendarContainerRef} className="flex-1 flex flex-col overflow-hidden">
         {/* Custom toolbar */}
         <div className="border-b bg-card px-4 md:px-6 min-h-[4rem] flex items-center gap-2 md:gap-4 flex-wrap py-2 md:py-0 md:h-16 md:flex-nowrap shrink-0">
+          <Button variant="ghost" size="icon" className="h-8 w-8 lg:hidden" onClick={() => setMobileSidebarOpen(true)}>
+            <PanelLeft className="h-4 w-4" />
+          </Button>
           <div className="flex items-center gap-1">
             <Button variant="ghost" size="icon" className="h-8 w-8" onClick={navigatePrev}>
               <ChevronLeft className="h-4 w-4" />
diff --git a/frontend/src/components/projects/KanbanBoard.tsx b/frontend/src/components/projects/KanbanBoard.tsx
index b6b629b..6658dbc 100644
--- a/frontend/src/components/projects/KanbanBoard.tsx
+++ b/frontend/src/components/projects/KanbanBoard.tsx
@@ -53,7 +53,7 @@ function KanbanColumn({
   return (
     <div
       ref={setNodeRef}
-      className={`flex-1 min-w-[200px] rounded-lg border transition-colors duration-150 ${
+      className={`flex-1 min-w-[160px] md:min-w-[200px] rounded-lg border transition-colors duration-150 ${
         isOver ? 'border-accent/40 bg-accent/5' : 'border-border bg-card/50'
       }`}
     >
@@ -200,7 +200,7 @@ export default function KanbanBoard({
         collisionDetection={closestCorners}
         onDragEnd={handleDragEnd}
       >
-        <div className="flex gap-3 overflow-x-auto pb-2">
+        <div className="flex gap-3 overflow-x-auto pb-2" style={{ WebkitOverflowScrolling: "touch" }}>
           {tasksByStatus.map(({ column, tasks: colTasks }) => (
             <KanbanColumn
               key={column.id}
diff --git a/frontend/src/components/ui/date-picker.tsx b/frontend/src/components/ui/date-picker.tsx
index b846ad2..f53ca6c 100644
--- a/frontend/src/components/ui/date-picker.tsx
+++ b/frontend/src/components/ui/date-picker.tsx
@@ -2,6 +2,7 @@ import * as React from 'react';
 import { createPortal } from 'react-dom';
 import { Calendar, ChevronLeft, ChevronRight, Clock } from 'lucide-react';
 import { cn } from '@/lib/utils';
+import { useMediaQuery } from '@/hooks/useMediaQuery';
 
 // ── Browser detection (stable — checked once at module load) ──
 
@@ -127,6 +128,7 @@ const DatePicker = React.forwardRef<HTMLButtonElement, DatePickerProps>(
     const blurTimeoutRef = React.useRef<ReturnType<typeof setTimeout>>();
 
     const [pos, setPos] = React.useState<{ top: number; left: number }>({ top: 0, left: 0 });
+    const isMobile = useMediaQuery('(max-width: 767px)');
 
     React.useImperativeHandle(ref, () => triggerRef.current!);