diff --git a/frontend/src/components/ui/Layout.jsx b/frontend/src/components/ui/Layout.jsx
index 8ce11da..0b03099 100644
--- a/frontend/src/components/ui/Layout.jsx
+++ b/frontend/src/components/ui/Layout.jsx
@@ -1,13 +1,13 @@
 import { useEffect, useState } from 'react'
-import { Outlet, NavLink, useNavigate } from 'react-router-dom'
+import { Outlet, NavLink, useNavigate, useLocation } from 'react-router-dom'
 import { useAuthStore } from '../../hooks/useAuth'
 import { useSyncStore, syncProgressPct } from '../../hooks/useSync'
 
 const nav = [
-  { to: '/', label: 'Dashboard', icon: '📊', exact: true },
-  { to: '/activities', label: 'Activities', icon: '🏃' },
-  { to: '/health', label: 'Health', icon: '❤️' },
-  { to: '/routes', label: 'Routes', icon: '🗺️' },
+  { to: '/', label: 'Dashboard', icon: '📊', exact: true, mobilePrimary: true },
+  { to: '/activities', label: 'Activities', icon: '🏃', mobilePrimary: true },
+  { to: '/health', label: 'Health', icon: '❤️', mobilePrimary: true },
+  { to: '/routes', label: 'Routes', icon: '🗺️', mobilePrimary: true },
   { to: '/records', label: 'Records', icon: '🏆' },
   { to: '/upload', label: 'Import', icon: '⬆️' },
   { to: '/profile', label: 'Profile', icon: '⚙️' },
@@ -17,14 +17,19 @@ const nav = [
 export default function Layout() {
   const { user, logout } = useAuthStore()
   const navigate = useNavigate()
+  const location = useLocation()
   const { inProgress, status, startPolling, stopPolling } = useSyncStore()
   const [collapsed, setCollapsed] = useState(() => localStorage.getItem('navCollapsed') === '1')
+  const [moreOpen, setMoreOpen] = useState(false)
 
   useEffect(() => {
     startPolling()
     return () => stopPolling()
   }, [])
 
+  // Close the mobile "More" sheet on navigation
+  useEffect(() => { setMoreOpen(false) }, [location.pathname])
+
   const toggleCollapsed = () => {
     setCollapsed(c => {
       const next = !c
@@ -39,10 +44,28 @@ export default function Layout() {
   }
 
   const role = user?.is_admin ? 'Administrator' : 'Member'
+  const visibleNav = nav.filter(({ adminOnly }) => !adminOnly || user?.is_admin)
+  const primaryNav = visibleNav.filter(i => i.mobilePrimary)
+  const moreNav = visibleNav.filter(i => !i.mobilePrimary)
+  const moreActive = moreNav.some(i => location.pathname.startsWith(i.to))
+
+  const syncProgress = (
+    <div className="space-y-1.5">
+      <div className="flex items-center gap-2 text-xs text-blue-400">
+        <span className="inline-block w-2 h-2 rounded-full bg-blue-400 animate-pulse" />
+        Garmin sync
+      </div>
+      <div className="h-1.5 bg-gray-800 rounded-full overflow-hidden">
+        <div className="h-full bg-blue-500 rounded-full transition-all duration-700"
+          style={{ width: `${syncProgressPct(status)}%` }} />
+      </div>
+      <p className="text-xs text-gray-500 truncate">{status || 'Starting sync…'}</p>
+    </div>
+  )
 
   return (
-    <div className="flex h-screen overflow-hidden bg-gray-950">
-      <aside className={`${collapsed ? 'w-16' : 'w-56'} flex-shrink-0 bg-gray-900 border-r border-gray-800 flex flex-col transition-[width] duration-200`}>
+    <div className="flex flex-col md:flex-row h-dvh overflow-hidden bg-gray-950">
+      <aside className={`${collapsed ? 'w-16' : 'w-56'} hidden md:flex flex-shrink-0 bg-gray-900 border-r border-gray-800 flex-col transition-[width] duration-200`}>
         <div className={`flex items-center border-b border-gray-800 px-3 py-5 ${collapsed ? 'justify-center' : 'justify-between'}`}>
           {!collapsed && (
             <h1 className="text-lg font-bold text-white tracking-tight">
@@ -57,7 +80,7 @@ export default function Layout() {
         </div>
 
         <nav className="flex-1 py-4 overflow-y-auto">
-          {nav.filter(({ adminOnly }) => !adminOnly || user?.is_admin).map(({ to, label, icon, exact }) => (
+          {visibleNav.map(({ to, label, icon, exact }) => (
             <NavLink key={to} to={to} end={exact} title={collapsed ? label : undefined}
               className={({ isActive }) =>
                 `flex items-center gap-3 py-2.5 text-sm transition-colors ${collapsed ? 'justify-center px-0' : 'px-4'} ${
@@ -73,16 +96,8 @@ export default function Layout() {
         </nav>
 
         {inProgress && !collapsed && (
-          <div className="px-4 py-3 border-t border-gray-800 space-y-1.5">
-            <div className="flex items-center gap-2 text-xs text-blue-400">
-              <span className="inline-block w-2 h-2 rounded-full bg-blue-400 animate-pulse" />
-              Garmin sync
-            </div>
-            <div className="h-1.5 bg-gray-800 rounded-full overflow-hidden">
-              <div className="h-full bg-blue-500 rounded-full transition-all duration-700"
-                style={{ width: `${syncProgressPct(status)}%` }} />
-            </div>
-            <p className="text-xs text-gray-500 truncate">{status || 'Starting sync…'}</p>
+          <div className="px-4 py-3 border-t border-gray-800">
+            {syncProgress}
           </div>
         )}
         {inProgress && collapsed && (
@@ -125,9 +140,97 @@ export default function Layout() {
         </div>
       </aside>
 
+      {/* Mobile top header */}
+      <header className="md:hidden flex items-center justify-between px-4 py-3 bg-gray-900 border-b border-gray-800">
+        <h1 className="text-lg font-bold text-white tracking-tight">
+          <span className="text-blue-400">Mile</span>Vault
+        </h1>
+        <div className="flex items-center gap-3">
+          {inProgress && (
+            <span className="inline-block w-2.5 h-2.5 rounded-full bg-blue-400 animate-pulse"
+              title={`Garmin sync: ${status || 'starting…'}`} />
+          )}
+          {user && (
+            <span className="w-8 h-8 rounded-full bg-blue-600/20 text-blue-300 flex items-center justify-center text-sm font-semibold uppercase">
+              {user.username?.[0] || '?'}
+            </span>
+          )}
+        </div>
+      </header>
+
       <main className="flex-1 overflow-y-auto">
         <Outlet />
       </main>
+
+      {/* Mobile bottom tab bar — z above Leaflet controls (~1000) */}
+      <nav className="md:hidden relative z-[1100] flex items-stretch bg-gray-900 border-t border-gray-800 pb-[env(safe-area-inset-bottom)]">
+        {primaryNav.map(({ to, label, icon, exact }) => (
+          <NavLink key={to} to={to} end={exact}
+            className={({ isActive }) =>
+              `flex-1 flex flex-col items-center gap-0.5 py-2 text-[10px] transition-colors ${
+                isActive ? 'text-blue-400' : 'text-gray-500'
+              }`
+            }>
+            <span className="text-lg leading-none">{icon}</span>
+            {label}
+          </NavLink>
+        ))}
+        <button onClick={() => setMoreOpen(true)}
+          className={`relative flex-1 flex flex-col items-center gap-0.5 py-2 text-[10px] transition-colors ${
+            moreActive ? 'text-blue-400' : 'text-gray-500'
+          }`}>
+          <span className="text-lg leading-none">☰</span>
+          More
+          {inProgress && (
+            <span className="absolute top-1.5 right-1/2 translate-x-4 inline-block w-2 h-2 rounded-full bg-blue-400 animate-pulse" />
+          )}
+        </button>
+      </nav>
+
+      {/* Mobile "More" slide-up sheet */}
+      {moreOpen && (
+        <div className="md:hidden fixed inset-0 z-[1200]">
+          <div className="absolute inset-0 bg-black/60" onClick={() => setMoreOpen(false)} />
+          <div className="absolute bottom-0 inset-x-0 bg-gray-900 rounded-t-2xl border-t border-gray-800 p-4 pb-[calc(1rem+env(safe-area-inset-bottom))]">
+            <div className="flex justify-center mb-3">
+              <span className="w-10 h-1 rounded-full bg-gray-700" />
+            </div>
+            {moreNav.map(({ to, label, icon, exact }) => (
+              <NavLink key={to} to={to} end={exact} onClick={() => setMoreOpen(false)}
+                className={({ isActive }) =>
+                  `flex items-center gap-3 px-2 py-3 rounded-lg text-sm transition-colors ${
+                    isActive ? 'bg-blue-600/20 text-blue-400' : 'text-gray-300 hover:bg-gray-800'
+                  }`
+                }>
+                <span>{icon}</span>
+                {label}
+              </NavLink>
+            ))}
+
+            {inProgress && (
+              <div className="mt-3 pt-3 border-t border-gray-800">
+                {syncProgress}
+              </div>
+            )}
+
+            {user && (
+              <div className="mt-3 pt-3 border-t border-gray-800 flex items-center gap-2.5">
+                <span className="w-8 h-8 flex-shrink-0 rounded-full bg-blue-600/20 text-blue-300 flex items-center justify-center text-sm font-semibold uppercase">
+                  {user.username?.[0] || '?'}
+                </span>
+                <div className="min-w-0 flex-1">
+                  <p className="text-sm font-medium text-white truncate">{user.username}</p>
+                  <p className={`text-xs ${user.is_admin ? 'text-amber-400' : 'text-gray-500'}`}>{role}</p>
+                </div>
+                <button onClick={handleLogout}
+                  className="text-sm text-gray-400 hover:text-red-400 transition-colors px-2 py-1">
+                  Sign out
+                </button>
+              </div>
+            )}
+          </div>
+        </div>
+      )}
     </div>
   )
 }
diff --git a/frontend/src/hooks/useMediaQuery.js b/frontend/src/hooks/useMediaQuery.js
new file mode 100644
index 0000000..9490a6f
--- /dev/null
+++ b/frontend/src/hooks/useMediaQuery.js
@@ -0,0 +1,16 @@
+import { useState, useEffect } from 'react'
+
+export function useMediaQuery(query) {
+  const [matches, setMatches] = useState(() => window.matchMedia(query).matches)
+  useEffect(() => {
+    const mql = window.matchMedia(query)
+    const onChange = e => setMatches(e.matches)
+    mql.addEventListener('change', onChange)
+    setMatches(mql.matches)
+    return () => mql.removeEventListener('change', onChange)
+  }, [query])
+  return matches
+}
+
+// Matches Tailwind's md breakpoint — keep CSS (md:) and JS forks in agreement.
+export const useIsMobile = () => !useMediaQuery('(min-width: 768px)')
diff --git a/frontend/src/pages/ActivitiesPage.jsx b/frontend/src/pages/ActivitiesPage.jsx
index 9ed2aa7..5e4d7f0 100644
--- a/frontend/src/pages/ActivitiesPage.jsx
+++ b/frontend/src/pages/ActivitiesPage.jsx
@@ -41,7 +41,7 @@ export default function ActivitiesPage() {
   const clearDateFilter = () => navigate('/activities')
 
   return (
-    <div className="p-6">
+    <div className="p-4 md:p-6">
       <div className="flex items-center justify-between mb-4">
         <h1 className="text-2xl font-bold text-white">Activities</h1>
         <Link
@@ -54,7 +54,7 @@ export default function ActivitiesPage() {
 
       {/* YTD stats */}
       {ytdStats && (
-        <div className="flex gap-4 mb-4 text-sm">
+        <div className="flex flex-wrap gap-x-4 gap-y-1 mb-4 text-sm">
           {ytdStats.running_km > 0 && (
             <span className="text-blue-400">🏃 {ytdStats.running_km.toFixed(0)} km this year</span>
           )}
@@ -100,7 +100,7 @@ export default function ActivitiesPage() {
             <Link
               key={activity.id}
               to={`/activities/${activity.id}`}
-              className="flex items-center gap-4 bg-gray-900 hover:bg-gray-800 border border-gray-800 hover:border-gray-700 rounded-xl p-4 transition-all group"
+              className="flex items-center gap-3 p-3 sm:gap-4 sm:p-4 bg-gray-900 hover:bg-gray-800 border border-gray-800 hover:border-gray-700 rounded-xl transition-all group"
             >
               {/* Sport indicator */}
               <div
@@ -116,6 +116,10 @@ export default function ActivitiesPage() {
                   {activity.name}
                 </p>
                 <p className="text-xs text-gray-500 mt-0.5">{formatDate(activity.start_time)}</p>
+                {/* Compact metrics line — the full metrics column is hidden below sm */}
+                <p className="sm:hidden text-xs text-gray-400 mt-0.5 truncate">
+                  {formatDistance(activity.distance_m)} · {formatDuration(activity.duration_s)} · {formatPace(activity.avg_speed_ms, activity.sport_type)}
+                </p>
               </div>
 
               {/* Metrics */}
diff --git a/frontend/src/pages/ActivityDetailPage.jsx b/frontend/src/pages/ActivityDetailPage.jsx
index 826b719..4570d46 100644
--- a/frontend/src/pages/ActivityDetailPage.jsx
+++ b/frontend/src/pages/ActivityDetailPage.jsx
@@ -120,20 +120,20 @@ export default function ActivityDetailPage() {
   if (!activity) return null
 
   return (
-    <div className="p-6 space-y-6">
+    <div className="p-4 md:p-6 space-y-6">
       {/* Header */}
       <div className="flex items-start justify-between">
-        <div>
+        <div className="min-w-0">
           <div className="flex items-center gap-2 mb-1">
             <span className="text-2xl">{sportIcon(activity.sport_type)}</span>
-            <h1 className="text-2xl font-bold text-white">{activity.name}</h1>
+            <h1 className="text-2xl font-bold text-white break-words min-w-0">{activity.name}</h1>
           </div>
           <p className="text-sm text-gray-500">{formatDateTime(activity.start_time)}</p>
         </div>
       </div>
 
       {/* Stats — all on one row */}
-      <div className="grid grid-cols-5 lg:grid-cols-10 gap-3">
+      <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-5 lg:grid-cols-10 gap-3">
         <StatCard label="Distance" value={formatDistance(activity.distance_m)} />
         <StatCard label="Time" value={formatDuration(activity.moving_time_s ?? activity.duration_s)}
           sub={activity.moving_time_s ? 'moving' : undefined} />
@@ -164,8 +164,8 @@ export default function ActivityDetailPage() {
       {activity.polyline && activity.distance_m > 0 ? (
       <div className="bg-gray-900 rounded-xl overflow-hidden border border-gray-800">
         {/* Map toolbar */}
-        <div className="flex items-center justify-between px-4 py-2 border-b border-gray-800">
-          <div className="flex items-center gap-2">
+        <div className="flex flex-wrap items-center justify-between gap-y-2 px-4 py-2 border-b border-gray-800">
+          <div className="flex flex-wrap items-center gap-2">
             <span className="text-xs text-gray-500">Map style:</span>
             {['dark', 'street', 'satellite'].map(t => (
               <button
@@ -202,18 +202,20 @@ export default function ActivityDetailPage() {
                 {label}
               </button>
             ))}
-            <span className="text-xs text-gray-500 ml-2">Height:</span>
-            {[280, 420, 560].map(h => (
-              <button
-                key={h}
-                onClick={() => setMapHeight(h)}
-                className={`text-xs px-2.5 py-1 rounded-full transition-colors ${
-                  mapHeight === h ? 'bg-blue-600 text-white' : 'text-gray-400 hover:text-white bg-gray-800'
-                }`}
-              >
-                {h === 280 ? 'S' : h === 420 ? 'M' : 'L'}
-              </button>
-            ))}
+            <div className="hidden sm:flex items-center gap-2 ml-2">
+              <span className="text-xs text-gray-500">Height:</span>
+              {[280, 420, 560].map(h => (
+                <button
+                  key={h}
+                  onClick={() => setMapHeight(h)}
+                  className={`text-xs px-2.5 py-1 rounded-full transition-colors ${
+                    mapHeight === h ? 'bg-blue-600 text-white' : 'text-gray-400 hover:text-white bg-gray-800'
+                  }`}
+                >
+                  {h === 280 ? 'S' : h === 420 ? 'M' : 'L'}
+                </button>
+              ))}
+            </div>
           </div>
         </div>
         {segCreate && (
@@ -272,7 +274,7 @@ export default function ActivityDetailPage() {
 
       {/* Metric timeline */}
       <div className="bg-gray-900 rounded-xl border border-gray-800 p-4">
-        <div className="flex items-center justify-between mb-4">
+        <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-2 mb-4">
           <h3 className="text-sm font-medium text-gray-300">Activity Timeline</h3>
           <div className="flex flex-wrap gap-2">
             {METRICS.filter(m => availableMetrics.has(m.key)).map(({ key, label, color }) => (
diff --git a/frontend/src/pages/DashboardPage.jsx b/frontend/src/pages/DashboardPage.jsx
index 1ca497c..f5ea046 100644
--- a/frontend/src/pages/DashboardPage.jsx
+++ b/frontend/src/pages/DashboardPage.jsx
@@ -9,6 +9,7 @@ import 'react-grid-layout/css/styles.css'
 import 'react-resizable/css/styles.css'
 import { startOfWeek, format, subWeeks, eachWeekOfInterval, subDays, addDays } from 'date-fns'
 import api from '../utils/api'
+import { useIsMobile } from '../hooks/useMediaQuery'
 import StatCard from '../components/ui/StatCard'
 import ActivityMap from '../components/activity/ActivityMap'
 import {
@@ -513,6 +514,7 @@ export default function DashboardPage() {
   })
 
   // ── Layout state ──────────────────────────────────────────────────────────
+  const isMobile = useIsMobile()
   const [editMode, setEditMode] = useState(false)
   const [addOpen, setAddOpen] = useState(false)
   const [layout, setLayout] = useState(() => buildLayout(null))
@@ -554,6 +556,11 @@ export default function DashboardPage() {
   }
   const removeWidget = (id) => { const next = layout.filter(l => l.i !== id); setLayout(next); persist(next) }
 
+  // Editing is desktop-only; drop out of edit mode if the viewport shrinks mid-edit.
+  useEffect(() => {
+    if (isMobile && editMode) { setEditMode(false); setAddOpen(false) }
+  }, [isMobile])
+
   const finishEditing = () => { persist(layout); setEditMode(false); setAddOpen(false) }
   const resetLayout = () => { const def = attachMins(DEFAULT_LAYOUT); setLayout(def); persist(def) }
 
@@ -579,8 +586,40 @@ export default function DashboardPage() {
   const presentIds = new Set(layout.map(l => l.i))
   const available = Object.keys(WIDGETS).filter(id => !presentIds.has(id))
 
+  // Single-column stack for phones: saved desktop layout read top-to-bottom,
+  // left-to-right; consecutive stat cards pair up into a 2-column grid.
+  const renderMobileStack = () => {
+    const sorted = [...layout].filter(l => WIDGETS[l.i]).sort((a, b) => a.y - b.y || a.x - b.x)
+    const groups = []
+    for (const l of sorted) {
+      const last = groups[groups.length - 1]
+      if (STAT_DEFS[l.i] && last?.stats) last.items.push(l)
+      else groups.push({ stats: !!STAT_DEFS[l.i], items: [l] })
+    }
+    // Content-driven widgets size themselves; chart widgets need the explicit
+    // height the grid normally provides (rowHeight=80, margin=16) or their
+    // ResponsiveContainers collapse.
+    const autoHeight = new Set(['sleepDetail', 'prs'])
+    return (
+      <div className="space-y-4">
+        {groups.map((g, idx) =>
+          g.stats ? (
+            <div key={idx} className="grid grid-cols-2 gap-3">
+              {g.items.map(l => <div key={l.i}>{renderWidget(l.i)}</div>)}
+            </div>
+          ) : (
+            <div key={g.items[0].i}
+              style={autoHeight.has(g.items[0].i) ? undefined : { height: g.items[0].h * 80 + (g.items[0].h - 1) * 16 }}>
+              {renderWidget(g.items[0].i)}
+            </div>
+          )
+        )}
+      </div>
+    )
+  }
+
   return (
-    <div className="p-6">
+    <div className="p-4 md:p-6">
       <div className="flex items-center justify-between mb-4">
         <h1 className="text-2xl font-bold text-white">Dashboard</h1>
         <div className="flex items-center gap-3">
@@ -607,13 +646,15 @@ export default function DashboardPage() {
           {editMode && (
             <button onClick={resetLayout} className="text-xs text-gray-400 hover:text-white transition-colors">Reset layout</button>
           )}
-          <button
-            onClick={() => (editMode ? finishEditing() : setEditMode(true))}
-            className={`text-sm font-medium px-3 py-1.5 rounded-lg transition-colors ${
-              editMode ? 'bg-blue-600 hover:bg-blue-500 text-white' : 'bg-gray-800 hover:bg-gray-700 text-gray-200'
-            }`}>
-            {editMode ? '✓ Done' : '✎ Edit dashboard'}
-          </button>
+          {!isMobile && (
+            <button
+              onClick={() => (editMode ? finishEditing() : setEditMode(true))}
+              className={`text-sm font-medium px-3 py-1.5 rounded-lg transition-colors ${
+                editMode ? 'bg-blue-600 hover:bg-blue-500 text-white' : 'bg-gray-800 hover:bg-gray-700 text-gray-200'
+              }`}>
+              {editMode ? '✓ Done' : '✎ Edit dashboard'}
+            </button>
+          )}
           <Link to="/upload" className="text-sm text-blue-400 hover:text-blue-300 transition-colors">+ Import data</Link>
         </div>
       </div>
@@ -622,6 +663,7 @@ export default function DashboardPage() {
         <p className="text-xs text-gray-500 mb-3">Drag to move, drag a corner to resize, or remove a widget with ✕. Add widgets from the menu. Changes save automatically.</p>
       )}
 
+      {isMobile ? renderMobileStack() : (
       <Grid
         className="layout"
         layout={layout}
@@ -647,6 +689,7 @@ export default function DashboardPage() {
           </div>
         ))}
       </Grid>
+      )}
     </div>
   )
 }
diff --git a/frontend/src/pages/HealthPage.jsx b/frontend/src/pages/HealthPage.jsx
index ac94ac5..cbf2671 100644
--- a/frontend/src/pages/HealthPage.jsx
+++ b/frontend/src/pages/HealthPage.jsx
@@ -488,7 +488,7 @@ function DailySnapshot({ day, snapshotWeight, avg30, intradayHr, bodyBattery, bb
               </span>
             )}
           </div>
-          <div className="flex items-end gap-3">
+          <div className="flex flex-wrap items-end gap-3">
             <span className="text-4xl font-bold text-white tracking-tight">
               {formatSleep(day.sleep_duration_s)}
             </span>
@@ -995,7 +995,7 @@ export default function HealthPage() {
   const selDateForCharts = selectedDay?.date
 
   return (
-    <div className="p-6 space-y-8">
+    <div className="p-4 md:p-6 space-y-6 md:space-y-8">
       <h1 className="text-2xl font-bold text-white">Health</h1>
 
       <DailySnapshot
@@ -1024,7 +1024,7 @@ export default function HealthPage() {
             <h2 className="text-base font-semibold text-gray-300">Trends</h2>
             <p className="text-xs text-gray-600">Click any point to load that day above</p>
           </div>
-          <div className="flex gap-1.5">
+          <div className="flex flex-wrap gap-1.5">
             {RANGES.map(({ label, days }, i) => {
               const disabled = i > maxEnabledRangeIdx
               return (
diff --git a/frontend/src/pages/LoginPage.jsx b/frontend/src/pages/LoginPage.jsx
index a548157..dca57ee 100644
--- a/frontend/src/pages/LoginPage.jsx
+++ b/frontend/src/pages/LoginPage.jsx
@@ -42,7 +42,7 @@ export default function LoginPage() {
   }
 
   return (
-    <div className="min-h-screen bg-gray-950 flex items-center justify-center px-4">
+    <div className="min-h-dvh bg-gray-950 flex items-center justify-center px-4">
       <div className="w-full max-w-sm">
         <div className="text-center mb-8">
           <h1 className="text-3xl font-bold text-white">
diff --git a/frontend/src/pages/ProfilePage.jsx b/frontend/src/pages/ProfilePage.jsx
index 3722416..e9ac3f9 100644
--- a/frontend/src/pages/ProfilePage.jsx
+++ b/frontend/src/pages/ProfilePage.jsx
@@ -189,7 +189,7 @@ export default function ProfilePage() {
   const effectiveMaxHr = profile?.max_heart_rate || profile?.estimated_max_hr
 
   return (
-    <div className="p-6 max-w-2xl space-y-6">
+    <div className="p-4 md:p-6 max-w-2xl space-y-6">
       <h1 className="text-2xl font-bold text-white">Profile & Settings</h1>
 
       {/* HR & Measurements */}
@@ -205,7 +205,7 @@ export default function ProfilePage() {
           )}
         </div>
 
-        <div className="grid grid-cols-2 gap-4">
+        <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
           <Field label="Max heart rate (bpm)" hint="Best from a sprint test or hard race">
             <Input type="number" value={hrForm.max_heart_rate} placeholder="e.g. 185" min={100} max={250}
               onChange={e => setHrForm(f => ({ ...f, max_heart_rate: e.target.value }))} />
@@ -235,7 +235,7 @@ export default function ProfilePage() {
           </Field>
         </div>
 
-        <div className="grid grid-cols-2 gap-4 pt-3 border-t border-gray-800">
+        <div className="grid grid-cols-1 sm:grid-cols-2 gap-4 pt-3 border-t border-gray-800">
           <Field label="Goal weight (kg)" hint="Shown as a target line on the weight trend chart">
             <Input type="number" value={hrForm.goal_weight_kg} placeholder="e.g. 72" min={20} max={500}
               onChange={e => setHrForm(f => ({ ...f, goal_weight_kg: e.target.value }))} />
diff --git a/frontend/src/pages/RecordsPage.jsx b/frontend/src/pages/RecordsPage.jsx
index adc800f..5fffb2b 100644
--- a/frontend/src/pages/RecordsPage.jsx
+++ b/frontend/src/pages/RecordsPage.jsx
@@ -44,7 +44,7 @@ function DistancePRs() {
 
   return (
     <div className="space-y-4">
-      <div className="flex gap-2">
+      <div className="flex flex-wrap gap-2">
         {SPORTS.map(s => (
           <button
             key={s}
@@ -69,6 +69,7 @@ function DistancePRs() {
 
       <div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
         <div className="bg-gray-900 rounded-xl border border-gray-800 overflow-hidden">
+          <div className="overflow-x-auto">
           <table className="w-full text-sm">
             <thead>
               <tr className="text-xs text-gray-500 border-b border-gray-800 bg-gray-900/80">
@@ -107,6 +108,7 @@ function DistancePRs() {
               ))}
             </tbody>
           </table>
+          </div>
         </div>
 
         <div className="bg-gray-900 rounded-xl border border-gray-800 p-4">
@@ -169,6 +171,7 @@ function RouteRecords() {
 
   return (
     <div className="bg-gray-900 rounded-xl border border-gray-800 overflow-hidden">
+      <div className="overflow-x-auto">
       <table className="w-full text-sm">
         <thead>
           <tr className="text-xs text-gray-500 border-b border-gray-800 bg-gray-900/80">
@@ -176,8 +179,8 @@ function RouteRecords() {
             <th className="text-left px-3 py-3 font-medium">Route</th>
             <th className="text-right px-3 py-3 font-medium">Distance</th>
             <th className="text-right px-3 py-3 font-medium">Best time</th>
-            <th className="text-right px-3 py-3 font-medium">Pace</th>
-            <th className="text-right px-3 py-3 font-medium">Date</th>
+            <th className="hidden sm:table-cell text-right px-3 py-3 font-medium">Pace</th>
+            <th className="hidden sm:table-cell text-right px-3 py-3 font-medium">Date</th>
           </tr>
         </thead>
         <tbody>
@@ -200,16 +203,17 @@ function RouteRecords() {
               <td className="px-3 py-3 text-right font-mono text-yellow-400 font-semibold">
                 {formatDuration(rec.duration_s)}
               </td>
-              <td className="px-3 py-3 text-right text-gray-400 text-xs">
+              <td className="hidden sm:table-cell px-3 py-3 text-right text-gray-400 text-xs">
                 {formatPace(rec.avg_speed_ms, rec.sport_type)}
               </td>
-              <td className="px-3 py-3 text-right text-gray-400 text-xs">
+              <td className="hidden sm:table-cell px-3 py-3 text-right text-gray-400 text-xs">
                 {formatDate(rec.start_time)}
               </td>
             </tr>
           ))}
         </tbody>
       </table>
+      </div>
     </div>
   )
 }
@@ -255,6 +259,7 @@ function SegmentRecords() {
 
   return (
     <div className="bg-gray-900 rounded-xl border border-gray-800 overflow-hidden">
+      <div className="overflow-x-auto">
       <table className="w-full text-sm">
         <thead>
           <tr className="text-xs text-gray-500 border-b border-gray-800 bg-gray-900/80">
@@ -302,6 +307,7 @@ function SegmentRecords() {
           ))}
         </tbody>
       </table>
+      </div>
     </div>
   )
 }
@@ -310,7 +316,7 @@ export default function RecordsPage() {
   const [tab, setTab] = useState('Distance PRs')
 
   return (
-    <div className="p-6 space-y-6">
+    <div className="p-4 md:p-6 space-y-6">
       <h1 className="text-2xl font-bold text-white">Records</h1>
 
       <div className="flex gap-2 flex-wrap">
diff --git a/frontend/src/pages/RoutesPage.jsx b/frontend/src/pages/RoutesPage.jsx
index d48b774..b7db925 100644
--- a/frontend/src/pages/RoutesPage.jsx
+++ b/frontend/src/pages/RoutesPage.jsx
@@ -110,9 +110,9 @@ function RouteDetail({ selected, setSelected }) {
 
   return (
     <div className="col-span-full bg-gray-900 rounded-xl border border-gray-800 p-5 space-y-4">
-      <div className="flex items-start justify-between gap-4">
-        <div className="flex gap-4 items-start min-w-0">
-          <div className="w-56 h-40 flex-shrink-0 rounded-lg overflow-hidden border border-gray-800">
+      <div className="flex flex-col sm:flex-row sm:items-start sm:justify-between gap-3 sm:gap-4">
+        <div className="flex flex-col sm:flex-row gap-4 items-start min-w-0 w-full sm:w-auto">
+          <div className="w-full sm:w-56 h-40 flex-shrink-0 rounded-lg overflow-hidden border border-gray-800">
             {selected.reference_polyline
               ? <ActivityMap polyline={selected.reference_polyline} sportType={selected.sport_type} colorMode="solid" />
               : <RouteMap polyline={selected.reference_polyline} className="w-full h-full" sportType={selected.sport_type} />}
@@ -262,7 +262,7 @@ export default function RoutesPage() {
   })
 
   return (
-    <div className="p-6 space-y-6">
+    <div className="p-4 md:p-6 space-y-6">
       <div className="flex items-center justify-between">
         <div>
           <h1 className="text-2xl font-bold text-white">Named Routes</h1>
diff --git a/frontend/src/pages/UploadPage.jsx b/frontend/src/pages/UploadPage.jsx
index 5d04713..f387272 100644
--- a/frontend/src/pages/UploadPage.jsx
+++ b/frontend/src/pages/UploadPage.jsx
@@ -142,7 +142,7 @@ function UploadZone({ title, description, accept, endpoint, icon }) {
 
 export default function UploadPage() {
   return (
-    <div className="p-6 space-y-6">
+    <div className="p-4 md:p-6 space-y-6">
       <div>
         <h1 className="text-2xl font-bold text-white">Import Data</h1>
         <p className="text-gray-500 text-sm mt-1">
diff --git a/frontend/src/pages/UsersPage.jsx b/frontend/src/pages/UsersPage.jsx
index 2928c61..e1d4937 100644
--- a/frontend/src/pages/UsersPage.jsx
+++ b/frontend/src/pages/UsersPage.jsx
@@ -30,7 +30,7 @@ export default function UsersPage() {
   }
 
   return (
-    <div className="p-6 max-w-3xl space-y-6">
+    <div className="p-4 md:p-6 max-w-3xl space-y-6">
       <div>
         <h1 className="text-2xl font-bold text-white">Users</h1>
         <p className="text-xs text-gray-500 mt-1">
@@ -43,6 +43,7 @@ export default function UsersPage() {
         {isLoading ? (
           <p className="p-5 text-sm text-gray-500">Loading…</p>
         ) : (
+          <div className="overflow-x-auto">
           <table className="w-full text-sm">
             <thead>
               <tr className="text-left text-xs text-gray-500 border-b border-gray-800">
@@ -91,6 +92,7 @@ export default function UsersPage() {
               })}
             </tbody>
           </table>
+          </div>
         )}
       </div>
     </div>
diff --git a/frontend/vite.config.js b/frontend/vite.config.js
index d379536..608c541 100644
--- a/frontend/vite.config.js
+++ b/frontend/vite.config.js
@@ -6,7 +6,8 @@ export default defineConfig({
   server: {
     proxy: {
       '/api': {
-        target: 'http://backend:8000',
+        // 'backend' only resolves inside docker compose; override for host-side dev
+        target: process.env.VITE_PROXY_TARGET || 'http://backend:8000',
         changeOrigin: true,
       },
     },