diff --git a/frontend/src/components/CreateContainerModal.tsx b/frontend/src/components/CreateContainerModal.tsx
index 358b33e..1a207cd 100644
--- a/frontend/src/components/CreateContainerModal.tsx
+++ b/frontend/src/components/CreateContainerModal.tsx
@@ -511,44 +511,46 @@ export default function CreateContainerModal({ isOpen, onClose, onSuccess, exist
             </Field>
           </div>
 
-          {/* Traffic control */}
-          <div>
-            <div className="flex items-center gap-3 mb-2">
-              <label className="text-sm font-medium text-gray-700">月流量</label>
-              <select
-                value={form.traffic_mode}
-                onChange={(e) => setForm({ ...form, traffic_mode: e.target.value })}
-                className="h-8 px-2 border border-gray-300 rounded text-xs text-gray-600 bg-white"
-              >
-                <option value="total">双向统计</option>
-                <option value="in_out">入/出分离</option>
-              </select>
+          <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
+            {/* Traffic control */}
+            <div>
+              <div className="flex items-center gap-3 mb-2">
+                <label className="text-sm font-medium text-gray-700">月流量</label>
+                <select
+                  value={form.traffic_mode}
+                  onChange={(e) => setForm({ ...form, traffic_mode: e.target.value })}
+                  className="h-8 px-2 border border-gray-300 rounded text-xs text-gray-600 bg-white"
+                >
+                  <option value="total">双向统计</option>
+                  <option value="in_out">入/出分离</option>
+                </select>
+              </div>
+              {form.traffic_mode === 'total' ? (
+                <div className="flex items-center gap-2">
+                  <NumberInput value={form.monthly_traffic_gb} min={0} onChange={(value) => setForm({ ...form, monthly_traffic_gb: value })} />
+                  <span className="text-xs text-gray-400">GB (0=不限制)</span>
+                </div>
+              ) : (
+                <div className="grid grid-cols-2 gap-3">
+                  <Field label="入站 (GB)">
+                    <NumberInput value={form.traffic_in_gb} min={0} onChange={(value) => setForm({ ...form, traffic_in_gb: value || 0 })} />
+                  </Field>
+                  <Field label="出站 (GB)">
+                    <NumberInput value={form.traffic_out_gb} min={0} onChange={(value) => setForm({ ...form, traffic_out_gb: value || 0 })} />
+                  </Field>
+                </div>
+              )}
             </div>
-            {form.traffic_mode === 'total' ? (
-              <div className="flex items-center gap-2">
-                <NumberInput value={form.monthly_traffic_gb} min={0} onChange={(value) => setForm({ ...form, monthly_traffic_gb: value })} />
-                <span className="text-xs text-gray-400">GB (0=不限制)</span>
-              </div>
-            ) : (
-              <div className="grid grid-cols-2 gap-3">
-                <Field label="入站 (GB)">
-                  <NumberInput value={form.traffic_in_gb} min={0} onChange={(value) => setForm({ ...form, traffic_in_gb: value || 0 })} />
-                </Field>
-                <Field label="出站 (GB)">
-                  <NumberInput value={form.traffic_out_gb} min={0} onChange={(value) => setForm({ ...form, traffic_out_gb: value || 0 })} />
-                </Field>
-              </div>
-            )}
-          </div>
 
-          <Field label="子用户快照上限">
-            <NumberInput
-              value={form.snapshot_limit}
-              min={1}
-              max={999}
-              onChange={(value) => setForm({ ...form, snapshot_limit: Math.max(1, Math.round(value || 1)) })}
-            />
-          </Field>
+            <Field label="子用户快照上限">
+              <NumberInput
+                value={form.snapshot_limit}
+                min={1}
+                max={999}
+                onChange={(value) => setForm({ ...form, snapshot_limit: Math.max(1, Math.round(value || 1)) })}
+              />
+            </Field>
+          </div>
 
           <Field label="到期时间">
             <div className="relative">
diff --git a/frontend/src/components/Sidebar.tsx b/frontend/src/components/Sidebar.tsx
index a5cbea8..d70edae 100644
--- a/frontend/src/components/Sidebar.tsx
+++ b/frontend/src/components/Sidebar.tsx
@@ -50,7 +50,7 @@ function LanguageIcon({ className = '' }: { className?: string }) {
   return (
     <svg className={className} viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
       <path
-        d="M213.333333 640v85.333333a85.333333 85.333333 0 0 0 78.933334 85.12L298.666667 810.666667h128v85.333333H298.666667a170.666667 170.666667 0 0 1-170.666667-170.666667v-85.333333h85.333333z m554.666667-213.333333l187.733333 469.333333h-91.946666l-51.242667-128h-174.506667l-51.157333 128h-91.904L682.666667 426.666667h85.333333z m-42.666667 123.093333L672.128 682.666667h106.325333L725.333333 549.76zM341.333333 85.333333v85.333334h170.666667v298.666666H341.333333v128H256v-128H85.333333V170.666667h170.666667V85.333333h85.333333z m384 42.666667a170.666667 170.666667 0 0 1 170.666667 170.666667v85.333333h-85.333333V298.666667a85.333333 85.333333 0 0 0-85.333334-85.333334h-128V128h128zM256 256H170.666667v128h85.333333V256z m170.666667 0H341.333333v128h85.333334V256z"
+        d="M128 170.6496A42.6496 42.6496 0 0 0 128 256V170.6496zM640 256a42.6496 42.6496 0 1 0 0-85.3504V256zM426.6496 128a42.6496 42.6496 0 0 0-85.2992 0h85.2992zM341.3504 213.3504a42.6496 42.6496 0 0 0 85.2992 0H341.3504z m56.6784 434.944a42.6496 42.6496 0 0 0 61.44-59.2896l-61.44 59.2896zM312.8832 367.4112a42.6496 42.6496 0 0 0-78.592 33.1776l78.592-33.1776z m220.4672 357.888a42.6496 42.6496 0 1 0 0 85.3504v-85.2992z m298.6496 85.3504a42.6496 42.6496 0 1 0 0-85.2992v85.2992z m-400.8448 66.2528a42.6496 42.6496 0 1 0 76.3392 38.1952l-76.288-38.1952z m251.4944-407.552l38.1952-19.0976a42.6496 42.6496 0 0 0-76.3392 0l38.144 19.0976z m175.2064 445.7472a42.6496 42.6496 0 1 0 76.288-38.1952l-76.288 38.1952zM586.1376 220.3648a42.6496 42.6496 0 1 0-84.1728-14.08l84.1728 14.08zM109.0048 735.2832a42.6496 42.6496 0 0 0 37.9904 76.4416l-37.9904-76.4416zM128 256h512V170.6496h-512V256z m213.3504-128v85.3504h85.2992V128H341.3504z m118.0672 461.0048a726.3232 726.3232 0 0 1-146.5344-221.5936l-78.592 33.1776a811.6224 811.6224 0 0 0 163.7376 247.7056l61.44-59.2896z m73.9328 221.696h298.6496v-85.3504h-298.6496v85.2992z m-25.856 104.3968l213.3504-426.7008-76.3392-38.144-213.3504 426.6496 76.3392 38.1952z m137.0112-426.7008l213.3504 426.7008 76.288-38.1952-213.2992-426.6496-76.3392 38.144zM501.9648 206.336C463.0016 438.6304 313.3952 633.7536 109.056 735.232l37.9904 76.4416c228.2496-113.4592 395.52-331.3152 439.1424-591.36L501.9648 206.336z"
         fill="currentColor"
       />
     </svg>
@@ -62,7 +62,7 @@ export default function Sidebar({ collapsed, onToggle }: SidebarProps) {
   const location = useLocation()
   const { logout, isSubUser } = useAuth()
   const { theme, toggleTheme } = useTheme()
-  const { language, toggleLanguage, t } = useLanguage()
+  const { toggleLanguage, t } = useLanguage()
   const [version, setVersion] = useState('')
 
   useEffect(() => {
@@ -282,10 +282,11 @@ export default function Sidebar({ collapsed, onToggle }: SidebarProps) {
 
           <button
             onClick={() => { void toggleLanguage() }}
-            className={`${collapsed ? 'w-full' : 'w-10'} flex items-center justify-center rounded-md px-2 py-2.5 text-sm text-gray-600 hover:bg-gray-100 transition-colors dark:text-gray-400 dark:hover:bg-gray-800`}
-            title={language === 'en' ? '切换中文' : 'Switch to English'}
+            className={`${collapsed ? 'w-full justify-center' : 'flex-1 justify-center'} flex items-center gap-2 rounded-md px-3 py-2.5 text-sm text-gray-600 hover:bg-gray-100 transition-colors dark:text-gray-400 dark:hover:bg-gray-800`}
+            title="Language"
           >
-            <LanguageIcon className="h-4 w-4" />
+            <LanguageIcon className="h-4 w-4 shrink-0" />
+            {!collapsed && <span>Language</span>}
           </button>
         </div>
 
diff --git a/frontend/src/pages/Routing.tsx b/frontend/src/pages/Routing.tsx
index 295586e..2d6e2bd 100644
--- a/frontend/src/pages/Routing.tsx
+++ b/frontend/src/pages/Routing.tsx
@@ -187,9 +187,9 @@ export default function Routing() {
       </div>
 
       <div className="grid gap-4 md:grid-cols-3">
-        <CapacityCard title={text.nat4Ports} icon={<Network className="h-5 w-5" />} remaining={routing?.nat4.remaining || '0'} total={routing?.nat4.total || '0'} used={routing?.nat4.used || 0} label={text.remainingTotal} usedLabel={text.used} />
-        <CapacityCard title={text.publicIPv4} icon={<Globe2 className="h-5 w-5" />} remaining={routing?.ipv4.remaining || '0'} total={routing?.ipv4.total || '0'} used={routing?.ipv4.used || 0} label={formatPoolCount(publicIPv4s.length, language)} usedLabel={text.used} />
-        <CapacityCard title="IPv6" icon={<Router className="h-5 w-5" />} remaining={formatCapacity(routing?.ipv6.remaining || '0', language)} total={formatCapacity(routing?.ipv6.total || '0', language)} used={routing?.ipv6.used || 0} label={formatDetectedPrefixCount(ipv6Prefixes.length, language)} usedLabel={text.used} />
+        <CapacityCard title={text.nat4Ports} watermark="NAT4" remaining={routing?.nat4.remaining || '0'} total={routing?.nat4.total || '0'} used={routing?.nat4.used || 0} label={text.remainingTotal} usedLabel={text.used} />
+        <CapacityCard title={text.publicIPv4} watermark="IPv4" remaining={routing?.ipv4.remaining || '0'} total={routing?.ipv4.total || '0'} used={routing?.ipv4.used || 0} label={formatPoolCount(publicIPv4s.length, language)} usedLabel={text.used} />
+        <CapacityCard title="IPv6" watermark="IPv6" remaining={formatCapacity(routing?.ipv6.remaining || '0', language)} total={formatCapacity(routing?.ipv6.total || '0', language)} used={routing?.ipv6.used || 0} label={formatDetectedPrefixCount(ipv6Prefixes.length, language)} usedLabel={text.used} />
       </div>
 
       <Panel
@@ -525,9 +525,9 @@ function Pagination({ page, totalPages, totalItems, pageSize, onPageChange, lang
   )
 }
 
-function CapacityCard({ title, icon, remaining, total, used, label, usedLabel }: {
+function CapacityCard({ title, watermark, remaining, total, used, label, usedLabel }: {
   title: string
-  icon: ReactNode
+  watermark: string
   remaining: string
   total: string
   used: number
@@ -535,8 +535,11 @@ function CapacityCard({ title, icon, remaining, total, used, label, usedLabel }:
   usedLabel: string
 }) {
   return (
-    <div className="rounded-lg border border-gray-200 bg-white p-4">
-      <div className="flex items-center justify-between gap-3">
+    <div className="relative overflow-hidden rounded-lg border border-gray-200 bg-white p-4">
+      <div className="pointer-events-none absolute bottom-1 right-3 select-none bg-gradient-to-br from-black via-gray-600 to-gray-300 bg-clip-text text-[44px] font-black italic tracking-wide text-transparent opacity-25 -skew-x-12">
+        {watermark}
+      </div>
+      <div className="relative z-10">
         <div>
           <div className="text-sm font-medium text-gray-700">{title}</div>
           <div className="mt-2 flex items-end gap-2">
@@ -544,10 +547,9 @@ function CapacityCard({ title, icon, remaining, total, used, label, usedLabel }:
             <span className="pb-1 text-sm text-gray-400">/ {total}</span>
           </div>
         </div>
-        <div className="flex h-10 w-10 items-center justify-center rounded-md bg-gray-100 text-gray-700">{icon}</div>
       </div>
-      <div className="mt-3 text-xs text-gray-500">{label}</div>
-      <div className="mt-1 text-xs text-gray-400">{usedLabel} {used}</div>
+      <div className="relative z-10 mt-3 text-xs text-gray-500">{label}</div>
+      <div className="relative z-10 mt-1 text-xs text-gray-400">{usedLabel} {used}</div>
     </div>
   )
 }