diff --git a/AGENTS.md b/AGENTS.md
index 0d4e8e4..e88aeed 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -204,6 +204,10 @@ The repository does not currently feature automated test files. Testing is execu
   can be integrated by adding definitions to the `APP_THEMES` array in `src/data/themes.ts`.
 - **Proxy Endpoint Rerouting**: The Ollama upstream proxy route in `vite.config.ts` and
   `api/ollama-chat.js` can be adjusted to point to alternative LLM hosts or local server instances.
+- **Motion Language**: Shared animation durations and the standard ease-out curve live in
+  `src/lib/motion.ts` (`VIEW_TRANSITION`, `MODAL_TRANSITION`, `TOAST_TRANSITION`, `TILE_TRANSITION`).
+  The root tree is wrapped in `MotionConfig reducedMotion="user"` (`src/main.tsx`), and `src/index.css`
+  carries the global `prefers-reduced-motion` neutralizer plus the shared hover/press interaction rules.
 - **Configurable Environment Parameters**:
   - `VITE_APPWRITE_ENDPOINT` – Base URL for the Appwrite API server.
   - `VITE_APPWRITE_PROJECT_ID` – The Appwrite project instance identifier.
diff --git a/src/App.tsx b/src/App.tsx
index bc71aeb..9f37d95 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -43,6 +43,7 @@ import { SettingsView } from "./components/views/SettingsView";
 import { TrendsView } from "./components/views/TrendsView";
 import { buildDashboard, buildInsights } from "./lib/dashboard";
 import { applyFilters, DEFAULT_FILTERS } from "./lib/filters";
+import { VIEW_TRANSITION } from "./lib/motion";
 import {
   evaluateLimits,
   limitStatusMessage,
@@ -659,7 +660,7 @@ function App() {
               initial={{ opacity: 0, y: 10 }}
               animate={{ opacity: 1, y: 0 }}
               exit={{ opacity: 0, y: -8 }}
-              transition={{ duration: 0.2 }}
+              transition={VIEW_TRANSITION}
               className="app-view"
             >
               {activeView === "overview" && (
diff --git a/src/components/BarcodeScannerModal.tsx b/src/components/BarcodeScannerModal.tsx
index 7fc1312..fa3582a 100644
--- a/src/components/BarcodeScannerModal.tsx
+++ b/src/components/BarcodeScannerModal.tsx
@@ -26,6 +26,7 @@ import {
 } from "../lib/barcodeScanner";
 import { listBarcodeCatalog, upsertCloudUserBarcodeMapping } from "../lib/appwriteBarcodes";
 import { caffeinePerCan, currency, defaultPriceForSize, wholeNumber } from "../lib/metrics";
+import { MODAL_TRANSITION } from "../lib/motion";
 import {
   loadUserBarcodeMappings,
   upsertUserBarcodeMapping,
@@ -311,7 +312,7 @@ export function BarcodeScannerModal({
           initial={{ opacity: 0, y: 18, scale: 0.98 }}
           animate={{ opacity: 1, y: 0, scale: 1 }}
           exit={{ opacity: 0, y: 14, scale: 0.98 }}
-          transition={{ duration: 0.22 }}
+          transition={MODAL_TRANSITION}
         >
           <div className="mb-5 flex items-start justify-between gap-4">
             <div>
diff --git a/src/components/ConfirmDialog.tsx b/src/components/ConfirmDialog.tsx
index d6720fb..1119344 100644
--- a/src/components/ConfirmDialog.tsx
+++ b/src/components/ConfirmDialog.tsx
@@ -1,5 +1,6 @@
 import { motion } from "framer-motion";
 import { AlertTriangle, Loader2, Trash2 } from "lucide-react";
+import { MODAL_TRANSITION } from "../lib/motion";
 import { Modal } from "./Modal";
 
 type ConfirmDialogProps = {
@@ -31,6 +32,7 @@ export function ConfirmDialog({
         initial={{ opacity: 0, y: 16, scale: 0.98 }}
         animate={{ opacity: 1, y: 0, scale: 1 }}
         exit={{ opacity: 0, y: 12, scale: 0.98 }}
+        transition={MODAL_TRANSITION}
       >
         <h2 id="confirm-title" className="text-2xl font-semibold tracking-tight text-white">
           {title}
diff --git a/src/components/EntryModal.tsx b/src/components/EntryModal.tsx
index e32279a..09ad778 100644
--- a/src/components/EntryModal.tsx
+++ b/src/components/EntryModal.tsx
@@ -4,6 +4,7 @@ import { useEffect, useMemo, useRef, useState, type CSSProperties, type FormEven
 import { MATERIAL_ACCENTS } from "../data/accents";
 import { BUILT_IN_FLAVOURS, DEFAULT_FLAVOUR, accentForCustomFlavour, flavourMeta } from "../data/flavours";
 import { caffeinePerCan, defaultPriceForSize, formatLocalInput, wholeNumber } from "../lib/metrics";
+import { MODAL_TRANSITION } from "../lib/motion";
 import { Modal } from "./Modal";
 import { Field } from "./ui";
 import type { EntryDraft, Flavour, RedBullEntry } from "../types";
@@ -129,7 +130,7 @@ export function EntryModal({
         initial={{ opacity: 0, y: 18, scale: 0.98 }}
         animate={{ opacity: 1, y: 0, scale: 1 }}
         exit={{ opacity: 0, y: 14, scale: 0.98 }}
-        transition={{ duration: 0.22 }}
+        transition={MODAL_TRANSITION}
       >
         <div className="mb-6 flex items-start justify-between gap-4">
           <div>
diff --git a/src/components/ImportPreviewModal.tsx b/src/components/ImportPreviewModal.tsx
index e91b9c6..85bc05c 100644
--- a/src/components/ImportPreviewModal.tsx
+++ b/src/components/ImportPreviewModal.tsx
@@ -1,6 +1,7 @@
 import { motion } from "framer-motion";
 import { FileSpreadsheet, Loader2, X } from "lucide-react";
 import { humanDateTime } from "../lib/metrics";
+import { MODAL_TRANSITION } from "../lib/motion";
 import { MiniMetric } from "./MetricTiles";
 import { Modal } from "./Modal";
 import type { ImportPreview, ImportPreviewRow } from "../types";
@@ -30,6 +31,7 @@ export function ImportPreviewModal({
           initial={{ opacity: 0, y: 18, scale: 0.98 }}
           animate={{ opacity: 1, y: 0, scale: 1 }}
           exit={{ opacity: 0, y: 14, scale: 0.98 }}
+          transition={MODAL_TRANSITION}
         >
           <div className="mb-5 flex items-start justify-between gap-4">
             <div>
diff --git a/src/components/MetricTiles.tsx b/src/components/MetricTiles.tsx
index 69a3423..4e11047 100644
--- a/src/components/MetricTiles.tsx
+++ b/src/components/MetricTiles.tsx
@@ -1,5 +1,6 @@
 import { motion } from "framer-motion";
 import type { LucideIcon } from "lucide-react";
+import { TILE_TRANSITION } from "../lib/motion";
 import { StatHint } from "./StatHint";
 import { Card } from "./ui";
 
@@ -16,7 +17,7 @@ export function MetricTile({ icon: Icon, label, value, detail, accent }: MetricT
     <motion.div
       initial={{ opacity: 0, y: 10 }}
       animate={{ opacity: 1, y: 0 }}
-      transition={{ duration: 0.22 }}
+      transition={TILE_TRANSITION}
     >
       <Card className="metric-tile">
         <div className="flex items-start justify-between gap-3">
diff --git a/src/components/Modal.tsx b/src/components/Modal.tsx
index 9942d4d..93b9f77 100644
--- a/src/components/Modal.tsx
+++ b/src/components/Modal.tsx
@@ -1,5 +1,6 @@
 import { AnimatePresence, motion } from "framer-motion";
 import { useEffect, useRef, type ReactNode, type RefObject } from "react";
+import { MODAL_TRANSITION } from "../lib/motion";
 
 const FOCUSABLE_SELECTOR =
   'a[href], button:not([disabled]), input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex="-1"])';
@@ -116,6 +117,7 @@ export function Modal({
           initial={{ opacity: 0 }}
           animate={{ opacity: 1 }}
           exit={{ opacity: 0 }}
+          transition={MODAL_TRANSITION}
           role="dialog"
           aria-modal="true"
           aria-labelledby={labelledBy}
diff --git a/src/components/Toasts.tsx b/src/components/Toasts.tsx
index 1a9b56b..367e6a8 100644
--- a/src/components/Toasts.tsx
+++ b/src/components/Toasts.tsx
@@ -1,6 +1,7 @@
 import { AnimatePresence, motion } from "framer-motion";
 import { AlertTriangle, CheckCircle2, Info, X } from "lucide-react";
 import { useCallback, useMemo, useRef, useState, type ReactNode } from "react";
+import { TOAST_TRANSITION } from "../lib/motion";
 import { ToastContext, type ToastInput, type ToastTone } from "../lib/toasts";
 
 const TOAST_DURATION_MS = 4500;
@@ -55,7 +56,7 @@ export function ToastProvider({ children }: { children: ReactNode }) {
                 initial={{ opacity: 0, y: -12, scale: 0.96 }}
                 animate={{ opacity: 1, y: 0, scale: 1 }}
                 exit={{ opacity: 0, y: -8, scale: 0.96 }}
-                transition={{ duration: 0.18 }}
+                transition={TOAST_TRANSITION}
               >
                 <ToneIcon className="toast-icon" size={18} aria-hidden="true" />
                 <p className="toast-message">{toast.message}</p>
diff --git a/src/components/TopBar.tsx b/src/components/TopBar.tsx
index 722b177..d6e6a18 100644
--- a/src/components/TopBar.tsx
+++ b/src/components/TopBar.tsx
@@ -36,7 +36,7 @@ export function TopBar({ activeView, busyAction, onAdd, onScan, className = "" }
 
       <div className="top-action-row">
         <button
-          className="secondary-button top-action-button justify-center active:scale-95"
+          className="secondary-button top-action-button justify-center"
           type="button"
           onClick={onScan}
           disabled={Boolean(busyAction)}
@@ -46,7 +46,7 @@ export function TopBar({ activeView, busyAction, onAdd, onScan, className = "" }
           <span className="top-action-label">Scan</span>
         </button>
         <button
-          className="primary-button top-action-button justify-center active:scale-95"
+          className="primary-button top-action-button justify-center"
           type="button"
           onClick={onAdd}
           disabled={Boolean(busyAction)}
diff --git a/src/index.css b/src/index.css
index af12618..d7a7e41 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1734,10 +1734,6 @@ textarea:focus-visible {
   background: color-mix(in srgb, var(--primary, #2563c7) 90%, #000000);
 }
 
-.fab-add:active {
-  transform: scale(0.94);
-}
-
 @media (min-width: 1024px) {
   .fab-add {
     display: none;
@@ -1975,3 +1971,104 @@ textarea:focus-visible {
   color: var(--text, #202124);
   background: color-mix(in srgb, var(--text, #202124) 6%, transparent);
 }
+
+/* --- Motion & interaction language (A6) --- */
+
+/* Neutralize CSS transitions/animations for reduced-motion users. */
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
+    scroll-behavior: auto !important;
+  }
+}
+
+/* Hover feedback for interactive classes that lacked it (fine pointers only). */
+@media (hover: hover) and (pointer: fine) {
+  .danger-button:hover {
+    background: color-mix(in srgb, var(--error-container, #fff3f1) 78%, var(--error, #ba1a1a));
+  }
+
+  .warning-button:hover {
+    background: color-mix(in srgb, var(--warning-container, #ffddb0) 78%, var(--warning, #8d5700));
+  }
+
+  .filter-bar-toggle:hover {
+    background: var(--surface-container-lowest, #ffffff);
+  }
+
+  .hero-search-button:hover {
+    background: var(--surface-container-low, #f7faff);
+    box-shadow: 0 4px 12px rgba(60, 64, 67, 0.14), 0 1px 2px rgba(60, 64, 67, 0.08);
+  }
+
+  .auth-mode-toggle button:hover {
+    color: var(--text, #202124);
+  }
+
+  .theme-tile:hover {
+    background: var(--surface-container-low, #f7faff);
+    border-color: color-mix(in srgb, var(--primary, #2563c7) 24%, var(--outline-variant, #d8e1ee));
+  }
+}
+
+/* Transform transitions so the shared press effect eases in and out. */
+.nav-item {
+  transition: background 0.16s ease, transform 0.16s ease;
+}
+
+.quick-add-button {
+  transition: background 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
+}
+
+.filter-bar-toggle,
+.theme-tile {
+  transition: background 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
+}
+
+.hero-search-button {
+  transition: background 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
+}
+
+.auth-mode-toggle button,
+.stat-hint-trigger,
+.password-toggle,
+.toast-dismiss {
+  transition: color 0.16s ease, background 0.16s ease, transform 0.16s ease;
+}
+
+/* Shared press effect; suppressed entirely under prefers-reduced-motion. */
+@media (prefers-reduced-motion: no-preference) {
+  .primary-button:active,
+  .drawer-primary-action:active,
+  .secondary-button:active,
+  .danger-button:active,
+  .warning-button:active,
+  .excel-button:active,
+  .list-button:active,
+  .icon-button:active,
+  .suggestion-chip:active,
+  .account-pill:active,
+  .quick-add-button:active,
+  .filter-bar-toggle:active,
+  .theme-tile:active,
+  .hero-search-button:active,
+  .auth-mode-toggle button:active,
+  .nav-item:active,
+  .mobile-nav-item:active,
+  .toast-dismiss:active,
+  .stat-hint-trigger:active {
+    transform: scale(0.97);
+  }
+
+  .password-toggle:active {
+    transform: translateY(-50%) scale(0.97);
+  }
+
+  .fab-add:active {
+    transform: scale(0.94);
+  }
+}
diff --git a/src/lib/motion.ts b/src/lib/motion.ts
new file mode 100644
index 0000000..368ec3b
--- /dev/null
+++ b/src/lib/motion.ts
@@ -0,0 +1,9 @@
+import type { Transition } from "framer-motion";
+
+// Standard ease-out curve shared by every animated surface (A6 motion language).
+export const EASE_OUT: [number, number, number, number] = [0.22, 1, 0.36, 1];
+
+export const VIEW_TRANSITION: Transition = { duration: 0.2, ease: EASE_OUT };
+export const MODAL_TRANSITION: Transition = { duration: 0.22, ease: EASE_OUT };
+export const TOAST_TRANSITION: Transition = { duration: 0.18, ease: EASE_OUT };
+export const TILE_TRANSITION: Transition = { duration: 0.22, ease: EASE_OUT };
diff --git a/src/main.tsx b/src/main.tsx
index 84baf62..07f9017 100644
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -1,3 +1,4 @@
+import { MotionConfig } from "framer-motion";
 import React from "react";
 import ReactDOM from "react-dom/client";
 import App from "./App";
@@ -6,8 +7,10 @@ import "./index.css";
 
 ReactDOM.createRoot(document.getElementById("root")!).render(
   <React.StrictMode>
-    <ToastProvider>
-      <App />
-    </ToastProvider>
+    <MotionConfig reducedMotion="user">
+      <ToastProvider>
+        <App />
+      </ToastProvider>
+    </MotionConfig>
   </React.StrictMode>,
 );