新增社区页面路由，更新底部导航以移除占位符，优化音量控制按钮样式和功能

client/src/App.tsx

@@ -18,6 +18,7 @@ import IOPage from "./pages/IOPage";
 import VUPage from "./pages/VUPage";
 import SelectPage from "./pages/SelectPage";
 import AIPage from "./pages/AIPage";
+import CommunityPage from "./pages/CommunityPage";
 
 function AppRouter() {
   return (
@@ -35,6 +36,7 @@ function AppRouter() {
       <Route path="/vu" component={VUPage} />
       <Route path="/select" component={SelectPage} />
       <Route path="/ai" component={AIPage} />
+      <Route path="/community" component={CommunityPage} />
       <Route path="/404" component={NotFound} />
       <Route component={NotFound} />
     </Switch>

client/src/components/BottomNav.tsx

@@ -19,11 +19,10 @@ interface NavItem {
   path: string;
   icon: React.ComponentType<{ size?: number; className?: string }>;
   label: string;
-  placeholder?: boolean;
 }
 
 const NAV_ITEMS: NavItem[] = [
-  { path: "/community", icon: MessageSquare, label: "社区", placeholder: true },
+  { path: "/community", icon: MessageSquare, label: "社区" },
   { path: "/eq", icon: Sliders, label: "HP-EQ" },
   { path: "/", icon: Home, label: "主页" },
   { path: "/effects", icon: Activity, label: "Effect" },
@@ -53,7 +52,7 @@ export default function BottomNav() {
           const Icon = item.icon;
 
           return (
-            <Link key={item.path} href={item.placeholder ? "#" : item.path}>
+            <Link key={item.path} href={item.path}>
               <div className="flex flex-col items-center justify-center relative pt-2.5 pb-1.5 px-3">
                 {/* Active indicator bar */}
                 <div

client/src/pages/CommunityPage.tsx

@@ -0,0 +1,32 @@
+import BottomNav from "@/components/BottomNav";
+import { MessageSquare } from "lucide-react";
+
+export default function CommunityPage() {
+  return (
+    <div
+      className="h-[100dvh] flex flex-col pb-[calc(env(safe-area-inset-bottom,0px)+56px)]"
+      style={{
+        background:
+          "radial-gradient(120% 80% at 50% 0%, rgba(12, 24, 30, 0.45) 0%, rgba(6, 9, 16, 0.92) 38%, #04060d 100%)",
+      }}
+    >
+      <main className="relative flex-1 flex items-center justify-center px-6">
+        <div className="flex flex-col items-center text-center -translate-y-8">
+          <div
+            className="w-[96px] h-[96px] rounded-full flex items-center justify-center mb-7"
+            style={{
+              background: "radial-gradient(circle at 35% 30%, rgba(0,255,246,0.18), rgba(0,255,246,0.07))",
+              boxShadow: "0 0 34px rgba(0,255,246,0.18), inset 0 0 24px rgba(0,255,246,0.08)",
+            }}
+          >
+            <MessageSquare size={38} className="text-[#00FFF6]" strokeWidth={2.2} />
+          </div>
+          <p className="text-white/85 text-[42px] leading-none font-semibold tracking-wide mb-3">Coming Soon</p>
+          <p className="text-white/40 text-[22px] leading-none">Community features are under development</p>
+        </div>
+
+      </main>
+      <BottomNav />
+    </div>
+  );
+}

client/src/pages/EQPage.tsx

@@ -289,12 +289,6 @@ function FreqChart({
           onClick={() => toast.info("已复制到 B")}>
           复制到 B
         </button>
-        <div className="flex-1" />
-        <button
-          className="px-2.5 py-1 rounded-[6px] text-[11px] font-bold"
-          style={{ background: "rgba(245,158,11,0.2)", border: "1px solid rgba(245,158,11,0.4)", color: "#f59e0b" }}>
-          DIFF
-        </button>
       </div>
 
       {/* SVG chart */}

client/src/pages/Home.tsx

@@ -46,7 +46,7 @@ type HomeLocale = NonNullable<(typeof localeZh)["home"]>;
 
 // ── Volume in dB (0-200 → -100dB to 0dB) ──
 function volToDB(v: number) {
-  if (v === 0) return "-∞";
+  if (v === 0) return "-100dB";
   const db = (v - 200) / 2;
   return `${db >= 0 ? "+" : ""}${db.toFixed(1)}dB`;
 }
@@ -165,6 +165,12 @@ export default function Home() {
   const vuLabel = `${homeText.vu ?? "VU表"}${(ds.vu ?? 0) + 1}`;
   const bypassOn = (ds.dsp_enable ?? 0) === 0;
 
+  // Home 的 volume 取值为 0..200，对应 dB = (v - 200) / 2
+  // 因此 1 个 volume 单位 = 0.5dB
+  // AudioPage 的 soundStep：0->0.5dB, 1->1dB, 2->2dB, 3->3dB
+  // 换算为 volume 单位：0.5/1/2/3 dB -> 1/2/4/6
+  const fineVolumeStep = [1, 2, 4, 6][ds.soundStep ?? 1] ?? 1;
+
   // Slider fill % (0-200 → 0-100%)
   const fillPct = (localVol / 200) * 100;
   // Knob angle (map 0..200 -> -135..+135 degrees)
@@ -369,10 +375,48 @@ export default function Home() {
           </button>
         </div>
         {/* dB value */}
-        <div className="text-center mt-1">
+        <div className="mt-[6px] flex items-center justify-center gap-3">
+          <button
+            type="button"
+            aria-label="Decrease volume"
+            disabled={localVol <= 0}
+            className="w-10 h-10 rounded-full flex items-center justify-center transition-all active:scale-95 disabled:opacity-30 disabled:cursor-not-allowed"
+            style={{
+              background: "rgba(44,44,46,0.6)",
+              border: "1px solid rgba(255,255,255,0.08)",
+              color: "rgba(255,255,255,0.55)",
+            }}
+            onClick={() => {
+              const next = Math.max(0, Math.min(200, localVol - fineVolumeStep));
+              setLocalVol(next);
+              setVolume(next);
+            }}
+          >
+            <span className="text-[20px] leading-none">-</span>
+          </button>
+
           <span className="text-[22px] font-bold tracking-tight" style={{ color: "#00FFF6" }}>
             {volToDB(localVol)}
           </span>
+
+          <button
+            type="button"
+            aria-label="Increase volume"
+            disabled={localVol >= 200}
+            className="w-10 h-10 rounded-full flex items-center justify-center transition-all active:scale-95 disabled:opacity-30 disabled:cursor-not-allowed"
+            style={{
+              background: "rgba(44,44,46,0.6)",
+              border: "1px solid rgba(255,255,255,0.08)",
+              color: "rgba(255,255,255,0.55)",
+            }}
+            onClick={() => {
+              const next = Math.max(0, Math.min(200, localVol + fineVolumeStep));
+              setLocalVol(next);
+              setVolume(next);
+            }}
+          >
+            <span className="text-[20px] leading-none">+</span>
+          </button>
         </div>
 
         {/* Bluetooth info */}