diff --git a/app/[locale]/(app)/admin/invite/invite-user-form.tsx b/app/[locale]/(app)/admin/invite/invite-user-form.tsx
index b1bf3bf..820052f 100644
--- a/app/[locale]/(app)/admin/invite/invite-user-form.tsx
+++ b/app/[locale]/(app)/admin/invite/invite-user-form.tsx
@@ -36,6 +36,7 @@ import { inviteUserAction } from "./actions";
 
 export function InviteUserForm() {
   const t = useTranslations("admin.invite");
+  const tRoles = useTranslations("roles");
 
   const [state, dispatchAction, isPending] = useActionState<InviteUserState, FormData>(
     inviteUserAction,
@@ -120,7 +121,7 @@ export function InviteUserForm() {
           >
             {appRoles.map((r) => (
               <option key={r} value={r}>
-                {r}
+                {tRoles(r)}
               </option>
             ))}
           </select>
@@ -138,12 +139,7 @@ export function InviteUserForm() {
           </p>
         )}
 
-        <Button
-          type="submit"
-          className="w-full"
-          disabled={isPending || (!form.formState.isValid && form.formState.isDirty)}
-          aria-disabled={isPending}
-        >
+        <Button type="submit" size="lg" className="w-full" disabled={isPending}>
           {isPending ? t("submitting") : t("submit")}
         </Button>
       </form>
diff --git a/app/[locale]/(app)/dashboard/page.tsx b/app/[locale]/(app)/dashboard/page.tsx
index 5ec1bdc..385cbf4 100644
--- a/app/[locale]/(app)/dashboard/page.tsx
+++ b/app/[locale]/(app)/dashboard/page.tsx
@@ -13,20 +13,23 @@ export default async function DashboardPage({ params }: { params: Promise<{ loca
   await params;
 
   const t = await getTranslations("dashboard");
+  const tRoles = await getTranslations("roles");
   const session = await getServerSession();
 
   // session is guaranteed non-null by the parent (app)/layout.tsx gate,
   // but we guard here to satisfy TypeScript's strict null checks.
   const email = session?.user.email ?? "";
-  const role = session?.role ?? "";
+  const role = session?.role;
+  // Clinicians think in names, not emails — greet by full_name when set.
+  const name = session?.fullName || email;
 
   return (
     <div className="px-8 py-10">
-      <h1 className="text-foreground text-2xl font-semibold">{t("welcome", { email })}</h1>
+      <h1 className="text-foreground text-2xl font-semibold">{t("welcome", { name })}</h1>
       <p className="text-muted-foreground mt-2 text-sm">
         {t("roleLabel")}{" "}
         <span className="bg-muted text-foreground rounded px-1.5 py-0.5 text-xs font-medium">
-          {role}
+          {role ? tRoles(role) : ""}
         </span>
       </p>
       <p className="text-muted-foreground mt-6 text-sm">{t("placeholder")}</p>
diff --git a/app/[locale]/(app)/layout.tsx b/app/[locale]/(app)/layout.tsx
index b9d5082..55b0824 100644
--- a/app/[locale]/(app)/layout.tsx
+++ b/app/[locale]/(app)/layout.tsx
@@ -50,10 +50,10 @@ export default async function AppLayout({
     return null;
   }
 
-  const { user, role } = session;
+  const { user, role, fullName } = session;
 
   return (
-    <AppShell email={user.email ?? ""} role={role} locale={locale}>
+    <AppShell email={user.email ?? ""} fullName={fullName} role={role} locale={locale}>
       {children}
     </AppShell>
   );
diff --git a/app/[locale]/(auth)/sign-in/sign-in-form.tsx b/app/[locale]/(auth)/sign-in/sign-in-form.tsx
index 0277116..745eeba 100644
--- a/app/[locale]/(auth)/sign-in/sign-in-form.tsx
+++ b/app/[locale]/(auth)/sign-in/sign-in-form.tsx
@@ -14,10 +14,11 @@
  * side or server-side.
  */
 
-import { useActionState, useEffect } from "react";
+import { useActionState, useEffect, useState } from "react";
 import { useForm } from "react-hook-form";
 import { zodResolver } from "@hookform/resolvers/zod";
 import { useTranslations } from "next-intl";
+import { Eye, EyeOff } from "lucide-react";
 
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
@@ -48,6 +49,10 @@ export function SignInForm() {
 
   const { errors: fieldErrors } = form.formState;
 
+  // Password reveal toggle — shared clinic PCs + VN keyboards make mistyped
+  // passwords common; letting the doctor verify what they typed cuts retries.
+  const [showPassword, setShowPassword] = useState(false);
+
   // Sync server-returned fieldErrors into RHF so the inline error UI is
   // consistent regardless of where the error originated.
   useEffect(() => {
@@ -83,6 +88,7 @@ export function SignInForm() {
           <Input
             id="email"
             type="email"
+            autoFocus
             autoComplete="email"
             autoCapitalize="none"
             spellCheck={false}
@@ -101,15 +107,28 @@ export function SignInForm() {
         {/* Password field */}
         <div className="space-y-1.5">
           <Label htmlFor="password">{t("passwordLabel")}</Label>
-          <Input
-            id="password"
-            type="password"
-            autoComplete="current-password"
-            disabled={isPending}
-            aria-invalid={!!fieldErrors.password}
-            aria-describedby={fieldErrors.password ? "password-error" : undefined}
-            {...form.register("password")}
-          />
+          <div className="relative">
+            <Input
+              id="password"
+              type={showPassword ? "text" : "password"}
+              autoComplete="current-password"
+              disabled={isPending}
+              className="pr-10"
+              aria-invalid={!!fieldErrors.password}
+              aria-describedby={fieldErrors.password ? "password-error" : undefined}
+              {...form.register("password")}
+            />
+            <button
+              type="button"
+              onClick={() => setShowPassword((v) => !v)}
+              disabled={isPending}
+              aria-label={showPassword ? t("hidePassword") : t("showPassword")}
+              aria-pressed={showPassword}
+              className="text-muted-foreground hover:text-foreground focus-visible:ring-ring absolute inset-y-0 right-0 flex w-10 items-center justify-center rounded-md focus:outline-none focus-visible:ring-2"
+            >
+              {showPassword ? <EyeOff className="size-4" /> : <Eye className="size-4" />}
+            </button>
+          </div>
           {fieldErrors.password && (
             <p id="password-error" className="text-destructive text-sm" role="alert">
               {fieldErrors.password.message}
@@ -125,12 +144,9 @@ export function SignInForm() {
         )}
 
         {/* Submit */}
-        <Button
-          type="submit"
-          className="w-full"
-          disabled={isPending || (!form.formState.isValid && form.formState.isDirty)}
-          aria-disabled={isPending}
-        >
+        {/* Submit stays enabled on partial/invalid input: a greyed-out primary
+            button reads as "app broken". Errors surface inline on submit. */}
+        <Button type="submit" size="lg" className="w-full" disabled={isPending}>
           {isPending ? t("submitting") : t("submit")}
         </Button>
       </form>
diff --git a/app/[locale]/layout.tsx b/app/[locale]/layout.tsx
index bf63721..3125a5f 100644
--- a/app/[locale]/layout.tsx
+++ b/app/[locale]/layout.tsx
@@ -4,6 +4,7 @@
 import { NextIntlClientProvider, hasLocale } from "next-intl";
 import { setRequestLocale } from "next-intl/server";
 import { notFound } from "next/navigation";
+import { Be_Vietnam_Pro } from "next/font/google";
 import type { Metadata, Viewport } from "next";
 import type { ReactNode } from "react";
 import { routing } from "@/i18n/routing";
@@ -12,6 +13,16 @@ import { SessionProvider } from "@/lib/auth/session-provider";
 import { Toaster } from "@/components/ui/sonner";
 import "../globals.css";
 
+// Vietnamese-complete web font. `vietnamese` subset covers stacked diacritics
+// (ế, ữ, ộ …) that render inconsistently across the low-end machines clinics
+// actually own. Exposed as a CSS variable consumed by --font-sans in globals.css.
+const beVietnamPro = Be_Vietnam_Pro({
+  subsets: ["latin", "vietnamese"],
+  weight: ["400", "500", "600", "700"],
+  variable: "--font-be-vietnam-pro",
+  display: "swap",
+});
+
 export const metadata: Metadata = {
   title: "BSK Clinic",
   description: "Educational clinic management rewrite",
@@ -58,7 +69,7 @@ export default async function LocaleLayout({
   // explicitly protected path prefixes (/dashboard, /admin).
 
   return (
-    <html lang={locale} suppressHydrationWarning>
+    <html lang={locale} className={beVietnamPro.variable} suppressHydrationWarning>
       <body>
         <NextIntlClientProvider>
           {/* Toaster is mounted once globally here so toast() calls from any
diff --git a/app/globals.css b/app/globals.css
index ee51281..db583e5 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -6,9 +6,10 @@
   --color-primary: oklch(0.205 0 0);
   --color-primary-foreground: oklch(0.985 0 0);
   --color-muted: oklch(0.97 0 0);
-  --color-muted-foreground: oklch(0.556 0 0);
+  /* Darkened from 0.556 → 0.50 for WCAG AA at small (text-xs) sizes. */
+  --color-muted-foreground: oklch(0.5 0 0);
   --color-border: oklch(0.922 0 0);
-  --font-sans: ui-sans-serif, system-ui, sans-serif;
+  --font-sans: var(--font-be-vietnam-pro), ui-sans-serif, system-ui, sans-serif;
   --font-mono: ui-monospace, "Courier New", monospace;
   --radius: 0.5rem;
 }
@@ -35,3 +36,15 @@ body {
   color: var(--color-foreground);
   font-family: var(--font-sans);
 }
+
+/* Respect users who ask the OS to reduce motion (vestibular safety). */
+@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;
+  }
+}
diff --git a/components/app-shell/app-shell-frame.tsx b/components/app-shell/app-shell-frame.tsx
new file mode 100644
index 0000000..09bdf64
--- /dev/null
+++ b/components/app-shell/app-shell-frame.tsx
@@ -0,0 +1,152 @@
+"use client";
+
+/**
+ * AppShellFrame — Client Component.
+ *
+ * Owns the responsive chrome: a persistent sidebar at `md+`, and an off-canvas
+ * drawer + hamburger top-bar below `md`. The (server-rendered) sidebar tree is
+ * passed in as the `sidebar` prop so this file stays free of data fetching.
+ *
+ * The mobile drawer is a proper modal: focus moves in on open, Tab is trapped,
+ * Esc closes it, body scroll is locked, and focus returns to the trigger on
+ * close. Uses `h-dvh` (not `h-screen`) so mobile browser chrome doesn't clip
+ * the layout. Drawer auto-closes on route change.
+ */
+
+import { useEffect, useRef, useState, type ReactNode } from "react";
+import { Menu } from "lucide-react";
+import { useTranslations } from "next-intl";
+import { usePathname } from "@/i18n/navigation";
+
+const DRAWER_ID = "app-mobile-drawer";
+const MAIN_ID = "main-content";
+
+type AppShellFrameProps = {
+  sidebar: ReactNode;
+  children: ReactNode;
+};
+
+export function AppShellFrame({ sidebar, children }: AppShellFrameProps) {
+  const [open, setOpen] = useState(false);
+  const pathname = usePathname();
+  const t = useTranslations("app");
+  const drawerRef = useRef<HTMLDivElement>(null);
+  const triggerRef = useRef<HTMLButtonElement>(null);
+
+  // Close the drawer on route change (nav tap, redirect). Adjusting state
+  // during render on a changed value is the React-recommended pattern — no
+  // effect, no cascading render.
+  const [lastPath, setLastPath] = useState(pathname);
+  if (pathname !== lastPath) {
+    setLastPath(pathname);
+    if (open) setOpen(false);
+  }
+
+  // Modal behaviors while the drawer is open: move focus in, trap Tab, Esc to
+  // close, lock body scroll, restore focus to the trigger on close. These are
+  // external-system syncs (DOM focus / listeners / body style), the legitimate
+  // use of an effect.
+  useEffect(() => {
+    if (!open) return;
+    const drawer = drawerRef.current;
+    if (!drawer) return;
+
+    const focusable = () =>
+      Array.from(
+        drawer.querySelectorAll<HTMLElement>(
+          'a[href],button:not([disabled]),select,input,textarea,[tabindex]:not([tabindex="-1"])',
+        ),
+      );
+
+    focusable()[0]?.focus();
+
+    const trigger = triggerRef.current;
+    const prevOverflow = document.body.style.overflow;
+    document.body.style.overflow = "hidden";
+
+    function onKeyDown(e: KeyboardEvent) {
+      if (e.key === "Escape") {
+        setOpen(false);
+        return;
+      }
+      if (e.key !== "Tab") return;
+      const items = focusable();
+      const first = items[0];
+      const last = items[items.length - 1];
+      if (!first || !last) return;
+      if (e.shiftKey && document.activeElement === first) {
+        e.preventDefault();
+        last.focus();
+      } else if (!e.shiftKey && document.activeElement === last) {
+        e.preventDefault();
+        first.focus();
+      }
+    }
+
+    document.addEventListener("keydown", onKeyDown);
+    return () => {
+      document.removeEventListener("keydown", onKeyDown);
+      document.body.style.overflow = prevOverflow;
+      // focus the trigger captured at open-time (ref may have changed by now).
+      trigger?.focus();
+    };
+  }, [open]);
+
+  return (
+    <div className="flex h-dvh overflow-hidden">
+      {/* Skip-link: first focusable, jumps keyboard users past the nav. */}
+      <a
+        href={`#${MAIN_ID}`}
+        className="bg-background text-foreground focus-visible:ring-ring sr-only focus:not-sr-only focus:absolute focus:top-2 focus:left-2 focus:z-50 focus:rounded-md focus:px-3 focus:py-2 focus:shadow focus-visible:ring-2"
+      >
+        {t("skipToContent")}
+      </a>
+
+      {/* Persistent sidebar — desktop only. */}
+      <div className="hidden md:flex">{sidebar}</div>
+
+      {/* Off-canvas drawer — below md, only when opened. */}
+      {open && (
+        <div className="fixed inset-0 z-40 md:hidden">
+          <div
+            className="absolute inset-0 bg-black/40"
+            onClick={() => setOpen(false)}
+            aria-hidden="true"
+          />
+          <div
+            ref={drawerRef}
+            id={DRAWER_ID}
+            role="dialog"
+            aria-modal="true"
+            aria-label={t("menu")}
+            className="absolute inset-y-0 left-0 flex"
+          >
+            {sidebar}
+          </div>
+        </div>
+      )}
+
+      <div className="flex flex-1 flex-col overflow-hidden">
+        {/* Mobile top bar with hamburger — below md only. */}
+        <header className="border-border flex h-14 shrink-0 items-center gap-2 border-b px-3 md:hidden">
+          <button
+            ref={triggerRef}
+            type="button"
+            onClick={() => setOpen(true)}
+            aria-label={t("openMenu")}
+            aria-expanded={open}
+            aria-controls={DRAWER_ID}
+            className="text-foreground hover:bg-muted focus-visible:ring-ring flex size-11 items-center justify-center rounded-md focus:outline-none focus-visible:ring-2"
+          >
+            <Menu className="size-5" />
+          </button>
+          <span className="text-foreground text-lg font-bold tracking-tight">BSK</span>
+        </header>
+
+        <main id={MAIN_ID} tabIndex={-1} className="flex-1 overflow-y-auto outline-none">
+          {children}
+        </main>
+      </div>
+    </div>
+  );
+}
diff --git a/components/app-shell/app-shell.tsx b/components/app-shell/app-shell.tsx
index 1da9769..a9eec78 100644
--- a/components/app-shell/app-shell.tsx
+++ b/components/app-shell/app-shell.tsx
@@ -1,30 +1,30 @@
 /**
  * AppShell — Server Component.
  *
- * Composes the full authenticated layout: fixed sidebar on the left,
- * scrollable main content area on the right. Receives user info from the
- * (app) layout which has already validated session + role.
- *
- * No client state here — sidebar is server-rendered, top-bar lives inside
- * the sidebar's bottom section for Phase 1 simplicity.
+ * Renders the server-side Sidebar and hands it to AppShellFrame, which owns the
+ * responsive chrome (persistent at md+, off-canvas drawer below md). Receives
+ * user info from the (app) layout which has already validated session + role.
  */
 
 import type { ReactNode } from "react";
 import type { AppRole } from "@/lib/db/roles";
 import { Sidebar } from "@/components/app-shell/sidebar";
+import { AppShellFrame } from "@/components/app-shell/app-shell-frame";
 
 type AppShellProps = {
   email: string;
+  fullName: string | null;
   role: AppRole;
   locale: string;
   children: ReactNode;
 };
 
-export function AppShell({ email, role, locale, children }: AppShellProps) {
+export function AppShell({ email, fullName, role, locale, children }: AppShellProps) {
   return (
-    <div className="flex h-screen overflow-hidden">
-      <Sidebar email={email} role={role} locale={locale} />
-      <main className="flex-1 overflow-y-auto">{children}</main>
-    </div>
+    <AppShellFrame
+      sidebar={<Sidebar email={email} fullName={fullName} role={role} locale={locale} />}
+    >
+      {children}
+    </AppShellFrame>
   );
 }
diff --git a/components/app-shell/locale-switcher.tsx b/components/app-shell/locale-switcher.tsx
index 0e9432c..e58ae29 100644
--- a/components/app-shell/locale-switcher.tsx
+++ b/components/app-shell/locale-switcher.tsx
@@ -8,6 +8,7 @@
  * locale prefix rewriting transparently.
  */
 
+import { useId } from "react";
 import { useLocale, useTranslations } from "next-intl";
 import { usePathname, useRouter } from "@/i18n/navigation";
 import { routing } from "@/i18n/routing";
@@ -17,6 +18,9 @@ export function LocaleSwitcher() {
   const router = useRouter();
   const pathname = usePathname();
   const t = useTranslations("app.localeSwitcher");
+  // useId keeps the id unique even when the sidebar is rendered in two DOM
+  // slots (desktop rail + mobile drawer) — no duplicate id / label collision.
+  const selectId = useId();
 
   function handleChange(e: React.ChangeEvent<HTMLSelectElement>) {
     const nextLocale = e.target.value as (typeof routing.locales)[number];
@@ -25,15 +29,15 @@ export function LocaleSwitcher() {
 
   return (
     <div className="flex items-center gap-1.5">
-      <label htmlFor="locale-select" className="text-muted-foreground sr-only text-xs">
+      <label htmlFor={selectId} className="text-muted-foreground sr-only text-xs">
         {t("label")}
       </label>
       <select
-        id="locale-select"
+        id={selectId}
         value={locale}
         onChange={handleChange}
         aria-label={t("label")}
-        className="border-border bg-background text-foreground rounded-md border px-2 py-1 text-xs focus:outline-none"
+        className="border-border bg-background text-foreground focus-visible:ring-ring rounded-md border px-2 py-2 text-xs focus:outline-none focus-visible:ring-2"
       >
         {routing.locales.map((l) => (
           <option key={l} value={l}>
diff --git a/components/app-shell/sidebar-nav.tsx b/components/app-shell/sidebar-nav.tsx
new file mode 100644
index 0000000..dc30f17
--- /dev/null
+++ b/components/app-shell/sidebar-nav.tsx
@@ -0,0 +1,58 @@
+"use client";
+
+/**
+ * Sidebar navigation list — Client Component.
+ *
+ * Split out from the (Server) Sidebar so it can read the current pathname and
+ * mark the active route. It imports ROLE_MENU directly (icons are client-safe
+ * lucide components) rather than receiving menu items as props — component
+ * types can't cross the RSC boundary.
+ *
+ * Active detection: next-intl's usePathname() returns the locale-stripped
+ * pathname (e.g. "/dashboard"), matching the locale-relative item.href.
+ */
+
+import { useTranslations } from "next-intl";
+import { Link, usePathname } from "@/i18n/navigation";
+import { ROLE_MENU } from "@/lib/auth/role-menu";
+import type { AppRole } from "@/lib/db/roles";
+
+type SidebarNavProps = {
+  role: AppRole;
+  locale: string;
+};
+
+export function SidebarNav({ role, locale }: SidebarNavProps) {
+  const t = useTranslations();
+  const pathname = usePathname();
+  const items = ROLE_MENU[role];
+
+  return (
+    <nav className="flex-1 overflow-y-auto px-2 py-3" aria-label="Main navigation">
+      <ul className="space-y-0.5">
+        {items.map((item) => {
+          const Icon = item.icon;
+          const isActive =
+            pathname === item.href || pathname.startsWith(`${item.href}/`);
+          return (
+            <li key={item.href}>
+              <Link
+                href={item.href}
+                locale={locale as "vi" | "en"}
+                aria-current={isActive ? "page" : undefined}
+                className={`flex min-h-11 items-center gap-2.5 rounded-md px-2.5 py-2 text-sm transition-colors ${
+                  isActive
+                    ? "bg-muted text-foreground font-medium"
+                    : "text-foreground hover:bg-muted"
+                }`}
+              >
+                <Icon className="size-4 shrink-0" />
+                {t(item.labelKey as Parameters<typeof t>[0])}
+              </Link>
+            </li>
+          );
+        })}
+      </ul>
+    </nav>
+  );
+}
diff --git a/components/app-shell/sidebar.tsx b/components/app-shell/sidebar.tsx
index baf2acc..3d7e3ca 100644
--- a/components/app-shell/sidebar.tsx
+++ b/components/app-shell/sidebar.tsx
@@ -7,21 +7,20 @@
  */
 
 import { getTranslations } from "next-intl/server";
-import { Link } from "@/i18n/navigation";
-import { ROLE_MENU } from "@/lib/auth/role-menu";
 import type { AppRole } from "@/lib/db/roles";
+import { SidebarNav } from "@/components/app-shell/sidebar-nav";
 import { SignOutButton } from "@/components/app-shell/sign-out-button";
 import { LocaleSwitcher } from "@/components/app-shell/locale-switcher";
 
 type SidebarProps = {
   email: string;
+  fullName: string | null;
   role: AppRole;
   locale: string;
 };
 
-export async function Sidebar({ email, role, locale }: SidebarProps) {
-  const t = await getTranslations();
-  const items = ROLE_MENU[role];
+export async function Sidebar({ email, fullName, role, locale }: SidebarProps) {
+  const tRoles = await getTranslations("roles");
 
   return (
     <aside className="bg-background border-border flex h-full w-56 shrink-0 flex-col border-r">
@@ -31,34 +30,17 @@ export async function Sidebar({ email, role, locale }: SidebarProps) {
         <p className="text-muted-foreground text-xs">Clinic Management</p>
       </div>
 
-      {/* User info */}
+      {/* User info — greet by name when set; email drops to a secondary line. */}
       <div className="border-border border-b px-4 py-3">
-        <p className="text-foreground truncate text-sm font-medium">{email}</p>
-        <span className="bg-muted text-muted-foreground mt-1 inline-block rounded px-1.5 py-0.5 text-xs font-medium">
-          {role}
+        <p className="text-foreground truncate text-sm font-medium">{fullName || email}</p>
+        {fullName && <p className="text-muted-foreground truncate text-xs">{email}</p>}
+        <span className="bg-muted text-foreground mt-1 inline-block rounded px-1.5 py-0.5 text-xs font-medium">
+          {tRoles(role)}
         </span>
       </div>
 
-      {/* Nav items */}
-      <nav className="flex-1 overflow-y-auto px-2 py-3" aria-label="Main navigation">
-        <ul className="space-y-0.5">
-          {items.map((item) => {
-            const Icon = item.icon;
-            return (
-              <li key={item.href}>
-                <Link
-                  href={item.href}
-                  locale={locale as "vi" | "en"}
-                  className="text-foreground hover:bg-muted flex items-center gap-2.5 rounded-md px-2.5 py-2 text-sm transition-colors"
-                >
-                  <Icon className="size-4 shrink-0" />
-                  {t(item.labelKey as Parameters<typeof t>[0])}
-                </Link>
-              </li>
-            );
-          })}
-        </ul>
-      </nav>
+      {/* Nav items (client component: marks the active route) */}
+      <SidebarNav role={role} locale={locale} />
 
       {/* Bottom actions */}
       <div className="border-border space-y-1 border-t px-2 py-3">
diff --git a/components/app-shell/sign-out-button.tsx b/components/app-shell/sign-out-button.tsx
index 289470f..a619e9b 100644
--- a/components/app-shell/sign-out-button.tsx
+++ b/components/app-shell/sign-out-button.tsx
@@ -22,7 +22,6 @@ function SignOutButtonInner() {
     <Button
       type="submit"
       variant="ghost"
-      size="sm"
       disabled={pending}
       className="w-full justify-start gap-2"
     >
diff --git a/components/ui/button.tsx b/components/ui/button.tsx
index 859fd11..c1e8996 100644
--- a/components/ui/button.tsx
+++ b/components/ui/button.tsx
@@ -22,7 +22,7 @@ const buttonVariants = cva(
         default: "h-9 px-4 py-2 has-[>svg]:px-3",
         xs: "h-6 gap-1 rounded-md px-2 text-xs has-[>svg]:px-1.5 [&_svg:not([class*='size-'])]:size-3",
         sm: "h-8 gap-1.5 rounded-md px-3 has-[>svg]:px-2.5",
-        lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
+        lg: "h-11 rounded-md px-6 has-[>svg]:px-4",
         icon: "size-9",
         "icon-xs": "size-6 rounded-md [&_svg:not([class*='size-'])]:size-3",
         "icon-sm": "size-8",
diff --git a/components/ui/input.tsx b/components/ui/input.tsx
index d99d717..98b0001 100644
--- a/components/ui/input.tsx
+++ b/components/ui/input.tsx
@@ -8,7 +8,7 @@ function Input({ className, type, ...props }: React.ComponentProps<"input">) {
       type={type}
       data-slot="input"
       className={cn(
-        "border-input selection:bg-primary selection:text-primary-foreground file:text-foreground placeholder:text-muted-foreground dark:bg-input/30 h-9 w-full min-w-0 rounded-md border bg-transparent px-3 py-1 text-base shadow-xs transition-[color,box-shadow] outline-none file:inline-flex file:h-7 file:border-0 file:bg-transparent file:text-sm file:font-medium disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
+        "border-input selection:bg-primary selection:text-primary-foreground file:text-foreground placeholder:text-muted-foreground dark:bg-input/30 h-10 w-full min-w-0 rounded-md border bg-transparent px-3 py-1 text-base shadow-xs transition-[color,box-shadow] outline-none file:inline-flex file:h-7 file:border-0 file:bg-transparent file:text-sm file:font-medium disabled:pointer-events-none disabled:cursor-not-allowed disabled:opacity-50 md:text-sm",
         "focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px]",
         "aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40",
         className,
diff --git a/messages/en.json b/messages/en.json
index 056b8a5..f88d144 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -18,18 +18,30 @@
       "success": "Invited {email}. If the email does not arrive within 5 minutes, copy the invite link from the Supabase dashboard under Authentication → Users.",
       "errorForbidden": "You do not have permission to invite users.",
       "errorEmailTaken": "This user is already enrolled in BSK.",
-      "errorGeneric": "Something went wrong. Please try again."
+      "errorGeneric": "Something went wrong. Please try again.",
+      "tooManyRequests": "Too many invites sent. Please try again in a few minutes."
     }
   },
+  "roles": {
+    "admin": "Admin",
+    "doctor": "Doctor",
+    "nurse": "Nurse",
+    "receptionist": "Receptionist",
+    "cashier": "Cashier",
+    "patient": "Patient"
+  },
   "auth": {
     "signIn": {
       "title": "Sign in to BSK",
       "subtitle": "Enter your credentials to access the clinic system.",
       "emailLabel": "Email",
       "passwordLabel": "Password",
+      "showPassword": "Show password",
+      "hidePassword": "Hide password",
       "submit": "Sign in",
       "submitting": "Signing in…",
       "invalidCredentials": "Invalid email or password.",
+      "tooManyAttempts": "Too many attempts. Please try again in a few minutes.",
       "genericError": "Something went wrong. Please try again."
     }
   },
@@ -50,6 +62,9 @@
   },
   "app": {
     "signOut": "Sign out",
+    "openMenu": "Open navigation menu",
+    "menu": "Navigation menu",
+    "skipToContent": "Skip to content",
     "unenrolledError": "Your account is not enrolled. Please contact an administrator.",
     "localeSwitcher": {
       "label": "Language",
@@ -60,7 +75,7 @@
     }
   },
   "dashboard": {
-    "welcome": "Welcome, {email}",
+    "welcome": "Welcome, {name}",
     "roleLabel": "Your role:",
     "placeholder": "Dashboard content is coming in a future phase."
   }
diff --git a/messages/vi.json b/messages/vi.json
index 5a8e1b3..a9e44a6 100644
--- a/messages/vi.json
+++ b/messages/vi.json
@@ -18,18 +18,30 @@
       "success": "Đã mời {email}. Nếu email không đến trong vòng 5 phút, hãy sao chép liên kết mời từ bảng điều khiển Supabase tại Authentication → Users.",
       "errorForbidden": "Bạn không có quyền mời người dùng.",
       "errorEmailTaken": "Người dùng này đã được đăng ký trong BSK.",
-      "errorGeneric": "Đã xảy ra lỗi. Vui lòng thử lại."
+      "errorGeneric": "Đã xảy ra lỗi. Vui lòng thử lại.",
+      "tooManyRequests": "Bạn đã gửi quá nhiều lời mời. Vui lòng thử lại sau ít phút."
     }
   },
+  "roles": {
+    "admin": "Quản trị",
+    "doctor": "Bác sĩ",
+    "nurse": "Điều dưỡng",
+    "receptionist": "Lễ tân",
+    "cashier": "Thu ngân",
+    "patient": "Bệnh nhân"
+  },
   "auth": {
     "signIn": {
       "title": "Đăng nhập BSK",
       "subtitle": "Nhập thông tin đăng nhập để truy cập hệ thống phòng khám.",
       "emailLabel": "Email",
       "passwordLabel": "Mật khẩu",
+      "showPassword": "Hiện mật khẩu",
+      "hidePassword": "Ẩn mật khẩu",
       "submit": "Đăng nhập",
       "submitting": "Đang đăng nhập…",
       "invalidCredentials": "Email hoặc mật khẩu không đúng.",
+      "tooManyAttempts": "Quá nhiều lần thử. Vui lòng thử lại sau ít phút.",
       "genericError": "Đã xảy ra lỗi. Vui lòng thử lại."
     }
   },
@@ -50,6 +62,9 @@
   },
   "app": {
     "signOut": "Đăng xuất",
+    "openMenu": "Mở menu điều hướng",
+    "menu": "Menu điều hướng",
+    "skipToContent": "Bỏ qua đến nội dung",
     "unenrolledError": "Tài khoản của bạn chưa được đăng ký. Vui lòng liên hệ quản trị viên.",
     "localeSwitcher": {
       "label": "Ngôn ngữ",
@@ -60,7 +75,7 @@
     }
   },
   "dashboard": {
-    "welcome": "Xin chào, {email}",
+    "welcome": "Xin chào, {name}",
     "roleLabel": "Vai trò của bạn:",
     "placeholder": "Nội dung trang chủ sẽ được bổ sung trong giai đoạn tiếp theo."
   }