diff --git a/frontend/src/components/calendar/CalendarPage.tsx b/frontend/src/components/calendar/CalendarPage.tsx
index b4ee310..e547f56 100644
--- a/frontend/src/components/calendar/CalendarPage.tsx
+++ b/frontend/src/components/calendar/CalendarPage.tsx
@@ -17,7 +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 { Sheet, SheetContent, SheetClose } from '@/components/ui/sheet';
 import CalendarSidebar from './CalendarSidebar';
 import EventDetailPanel from './EventDetailPanel';
 import type { CreateDefaults } from './EventDetailPanel';
@@ -165,7 +165,6 @@ 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
@@ -484,9 +483,10 @@ export default function CalendarPage() {
         />
       </div>
 
-      {isMobile && (
+      {!isDesktop && (
         <Sheet open={mobileSidebarOpen} onOpenChange={setMobileSidebarOpen}>
           <SheetContent className="w-72 p-0">
+            <SheetClose onClick={() => setMobileSidebarOpen(false)} />
             <CalendarSidebar onUseTemplate={(tmpl) => { setMobileSidebarOpen(false); handleUseTemplate(tmpl); }} onSharedVisibilityChange={setVisibleSharedIds} width={288} />
           </SheetContent>
         </Sheet>
@@ -540,12 +540,12 @@ export default function CalendarPage() {
             ))}
           </div>
 
-          <h2 className="text-lg font-semibold font-heading hidden sm:block">{calendarTitle}</h2>
+          <h2 className="text-sm sm:text-lg font-semibold font-heading truncate">{calendarTitle}</h2>
 
           <div className="flex-1" />
 
           {/* Event search */}
-          <div className="relative hidden md:block">
+          <div className="relative">
             <Search className="absolute left-2.5 top-1/2 -translate-y-1/2 h-3.5 w-3.5 text-muted-foreground" />
             <Input
               placeholder="Search events..."
@@ -553,7 +553,7 @@ export default function CalendarPage() {
               onChange={(e) => setEventSearch(e.target.value)}
               onFocus={() => setSearchFocused(true)}
               onBlur={() => setTimeout(() => setSearchFocused(false), 200)}
-              className="w-52 h-8 pl-8 text-sm ring-inset"
+              className="w-32 sm:w-52 h-8 pl-8 text-sm ring-inset"
             />
             {searchFocused && searchResults.length > 0 && (
               <div className="absolute z-50 mt-1 w-72 right-0 rounded-md border bg-popover shadow-lg overflow-hidden">
@@ -644,7 +644,7 @@ export default function CalendarPage() {
           onClick={handlePanelClose}
         >
           <div
-            className="fixed inset-y-0 right-0 w-full sm:w-[400px] bg-card border-l border-border shadow-lg"
+            className="fixed inset-y-0 right-0 w-full sm:w-[400px] bg-card border-l border-border shadow-lg overflow-y-auto"
             onClick={(e) => e.stopPropagation()}
           >
             <EventDetailPanel
diff --git a/frontend/src/components/locations/LocationsPage.tsx b/frontend/src/components/locations/LocationsPage.tsx
index 36a7238..9a21eb6 100644
--- a/frontend/src/components/locations/LocationsPage.tsx
+++ b/frontend/src/components/locations/LocationsPage.tsx
@@ -360,7 +360,7 @@ export default function LocationsPage() {
                     <div className={`rounded-lg border p-3 transition-colors ${selectedLocationId === location.id ? 'border-accent/40 bg-accent/5' : 'border-border bg-card hover:bg-card-elevated'}`}>
                       <div className="flex items-center justify-between mb-1">
                         <span className="font-medium text-sm truncate flex-1">{location.name}</span>
-                        {location.category && <span className="text-[10px] text-muted-foreground">{location.category}</span>}
+                        {location.category && <span className="text-xs text-muted-foreground">{location.category}</span>}
                       </div>
                       {location.address && (
                         <p className="text-xs text-muted-foreground truncate">{location.address}</p>
diff --git a/frontend/src/components/people/PeoplePage.tsx b/frontend/src/components/people/PeoplePage.tsx
index d51cc3c..5fa89c8 100644
--- a/frontend/src/components/people/PeoplePage.tsx
+++ b/frontend/src/components/people/PeoplePage.tsx
@@ -748,7 +748,7 @@ export default function PeoplePage() {
                     <div className={`rounded-lg border p-3 transition-colors ${selectedPersonId === person.id ? 'border-accent/40 bg-accent/5' : 'border-border bg-card hover:bg-card-elevated'}`}>
                       <div className="flex items-center justify-between mb-1">
                         <span className="font-medium text-sm truncate flex-1">{person.name}</span>
-                        {person.category && <span className="text-[10px] text-muted-foreground">{person.category}</span>}
+                        {person.category && <span className="text-xs text-muted-foreground">{person.category}</span>}
                       </div>
                       <div className="flex items-center gap-2 text-xs text-muted-foreground">
                         {person.email && <span className="truncate">{person.email}</span>}
diff --git a/frontend/src/components/projects/KanbanBoard.tsx b/frontend/src/components/projects/KanbanBoard.tsx
index 6658dbc..91b258c 100644
--- a/frontend/src/components/projects/KanbanBoard.tsx
+++ b/frontend/src/components/projects/KanbanBoard.tsx
@@ -2,6 +2,7 @@ import {
   DndContext,
   closestCorners,
   PointerSensor,
+  TouchSensor,
   useSensor,
   useSensors,
   type DragEndEvent,
@@ -200,7 +201,7 @@ export default function KanbanBoard({
         collisionDetection={closestCorners}
         onDragEnd={handleDragEnd}
       >
-        <div className="flex gap-3 overflow-x-auto pb-2" style={{ WebkitOverflowScrolling: "touch" }}>
+        <div className="flex gap-3 overflow-x-auto pb-2">
           {tasksByStatus.map(({ column, tasks: colTasks }) => (
             <KanbanColumn
               key={column.id}
diff --git a/frontend/src/components/projects/ProjectsPage.tsx b/frontend/src/components/projects/ProjectsPage.tsx
index b172aa6..1b6b37c 100644
--- a/frontend/src/components/projects/ProjectsPage.tsx
+++ b/frontend/src/components/projects/ProjectsPage.tsx
@@ -105,13 +105,13 @@ export default function ProjectsPage() {
 
         <div className="flex-1" />
 
-        <div className="relative hidden md:block">
+        <div className="relative">
           <Search className="absolute left-2.5 top-1/2 -translate-y-1/2 h-3.5 w-3.5 text-muted-foreground" />
           <Input
             placeholder="Search..."
             value={search}
             onChange={(e) => setSearch(e.target.value)}
-            className="w-52 h-8 pl-8 text-sm"
+            className="w-32 sm:w-52 h-8 pl-8 text-sm"
           />
         </div>
 
diff --git a/frontend/src/components/reminders/RemindersPage.tsx b/frontend/src/components/reminders/RemindersPage.tsx
index 55f892a..e00b61d 100644
--- a/frontend/src/components/reminders/RemindersPage.tsx
+++ b/frontend/src/components/reminders/RemindersPage.tsx
@@ -135,13 +135,13 @@ export default function RemindersPage() {
 
         <div className="flex-1" />
 
-        <div className="relative hidden md:block">
+        <div className="relative">
           <Search className="absolute left-2.5 top-1/2 -translate-y-1/2 h-3.5 w-3.5 text-muted-foreground" />
           <Input
             placeholder="Search..."
             value={search}
             onChange={(e) => setSearch(e.target.value)}
-            className="w-52 h-8 pl-8 text-sm ring-inset"
+            className="w-32 sm:w-52 h-8 pl-8 text-sm ring-inset"
           />
         </div>
 
diff --git a/frontend/src/components/shared/EntityTable.tsx b/frontend/src/components/shared/EntityTable.tsx
index e6ccf27..529493d 100644
--- a/frontend/src/components/shared/EntityTable.tsx
+++ b/frontend/src/components/shared/EntityTable.tsx
@@ -149,7 +149,7 @@ export function EntityTable<T extends { id: number }>({
               <>
                 <p className="text-[11px] uppercase tracking-wider text-muted-foreground font-medium pt-2">{pinnedLabel}</p>
                 {pinnedRows.map((item) => (
-                  <div key={item.id} onClick={() => onRowClick(item.id)} className="cursor-pointer">
+                  <div key={item.id} onClick={() => onRowClick(item.id)} className="cursor-pointer" role="button" tabIndex={0} onKeyDown={(e) => { if (e.key === "Enter" || e.key === " ") { e.preventDefault(); onRowClick(item.id); } }}>
                     {mobileCardRender(item)}
                   </div>
                 ))}
@@ -161,7 +161,7 @@ export function EntityTable<T extends { id: number }>({
                   <>
                     <p className="text-[11px] uppercase tracking-wider text-muted-foreground font-medium pt-2">{group.label}</p>
                     {group.rows.map((item) => (
-                      <div key={item.id} onClick={() => onRowClick(item.id)} className="cursor-pointer">
+                      <div key={item.id} onClick={() => onRowClick(item.id)} className="cursor-pointer" role="button" tabIndex={0} onKeyDown={(e) => { if (e.key === "Enter" || e.key === " ") { e.preventDefault(); onRowClick(item.id); } }}>
                         {mobileCardRender(item)}
                       </div>
                     ))}
diff --git a/frontend/src/components/ui/button.tsx b/frontend/src/components/ui/button.tsx
index 0a9968a..6d826aa 100644
--- a/frontend/src/components/ui/button.tsx
+++ b/frontend/src/components/ui/button.tsx
@@ -18,7 +18,7 @@ const buttonVariants = cva(
         default: 'h-10 px-4 py-2',
         sm: 'h-9 rounded-md px-3',
         lg: 'h-11 rounded-md px-8',
-        icon: 'h-11 w-11 md:h-10 md:w-10',
+        icon: 'h-10 w-10 min-h-[44px] min-w-[44px] md:min-h-0 md:min-w-0',
       },
     },
     defaultVariants: {
diff --git a/frontend/src/components/ui/date-picker.tsx b/frontend/src/components/ui/date-picker.tsx
index f53ca6c..4f9f7bb 100644
--- a/frontend/src/components/ui/date-picker.tsx
+++ b/frontend/src/components/ui/date-picker.tsx
@@ -326,8 +326,8 @@ const DatePicker = React.forwardRef<HTMLButtonElement, DatePickerProps>(
           <div
             ref={popupRef}
             onMouseDown={(e) => e.stopPropagation()}
-            style={{ position: 'fixed', top: pos.top, left: pos.left, zIndex: 60 }}
-            className="w-[280px] rounded-lg border border-input bg-card shadow-lg animate-fade-in"
+            style={isMobile ? { position: 'fixed', bottom: 0, left: 0, right: 0, zIndex: 60 } : { position: 'fixed', top: pos.top, left: pos.left, zIndex: 60 }}
+            className={isMobile ? 'w-full rounded-t-lg border border-input bg-card shadow-lg animate-fade-in pb-[env(safe-area-inset-bottom)]' : 'w-[280px] rounded-lg border border-input bg-card shadow-lg animate-fade-in'}
           >
             {/* Month/Year nav */}
             <div className="flex items-center justify-between px-3 pt-3 pb-2">
diff --git a/frontend/src/hooks/useMediaQuery.ts b/frontend/src/hooks/useMediaQuery.ts
index b3c4279..6fc4f90 100644
--- a/frontend/src/hooks/useMediaQuery.ts
+++ b/frontend/src/hooks/useMediaQuery.ts
@@ -1,7 +1,9 @@
 import { useState, useEffect } from 'react';
 
 export function useMediaQuery(query: string): boolean {
-  const [matches, setMatches] = useState(() => window.matchMedia(query).matches);
+  const [matches, setMatches] = useState(() =>
+    typeof window !== 'undefined' ? window.matchMedia(query).matches : false
+  );
 
   useEffect(() => {
     const mql = window.matchMedia(query);