diff --git a/apps/web/app/[locale]/(public)/design-system/page.tsx b/apps/web/app/[locale]/(public)/design-system/page.tsx
new file mode 100644
index 0000000..9d824c4
--- /dev/null
+++ b/apps/web/app/[locale]/(public)/design-system/page.tsx
@@ -0,0 +1,258 @@
+'use client';
+
+import {
+  Activity,
+  Bell,
+  Building2,
+  Home,
+  LineChart,
+  Map,
+  User2,
+} from 'lucide-react';
+import {
+  CompactHeader,
+  DashboardLayout,
+  DataTable,
+  MarketIndex,
+  PriceDelta,
+  StatCard,
+  TickerStrip,
+  type DataTableColumn,
+} from '@/components/design-system';
+
+type DistrictRow = {
+  id: string;
+  code: string;
+  name: string;
+  price: number; // tr/m²
+  changePercent: number;
+  volume: number;
+  area: number;
+};
+
+const tickerItems = [
+  { id: 't-q1', label: 'Q1', changePercent: 2.3 },
+  { id: 't-q2', label: 'Q2', changePercent: 0.5 },
+  { id: 't-q7', label: 'Q7', changePercent: -1.1 },
+  { id: 't-bt', label: 'BT', changePercent: 0.0 },
+  { id: 't-td', label: 'TĐ', changePercent: 1.8 },
+  { id: 't-gv', label: 'GV', changePercent: -0.4 },
+  { id: 't-q9', label: 'Q9', changePercent: 3.1 },
+  { id: 't-tb', label: 'TB', changePercent: 0.2 },
+];
+
+const rows: DistrictRow[] = [
+  { id: 'q1', code: 'Q1', name: 'Quận 1', price: 152.4, changePercent: 2.3, volume: 42, area: 78 },
+  { id: 'q2', code: 'Q2', name: 'Quận 2', price: 98.7, changePercent: 0.5, volume: 55, area: 120 },
+  { id: 'q7', code: 'Q7', name: 'Quận 7', price: 85.2, changePercent: -1.1, volume: 67, area: 95 },
+  { id: 'bt', code: 'BT', name: 'Bình Thạnh', price: 72.0, changePercent: 0.0, volume: 29, area: 88 },
+  { id: 'td', code: 'TĐ', name: 'Thủ Đức', price: 58.9, changePercent: 1.8, volume: 91, area: 102 },
+  { id: 'q9', code: 'Q9', name: 'Quận 9', price: 45.2, changePercent: 3.1, volume: 112, area: 110 },
+  { id: 'tb', code: 'TB', name: 'Tân Bình', price: 76.5, changePercent: 0.2, volume: 38, area: 82 },
+  { id: 'gv', code: 'GV', name: 'Gò Vấp', price: 62.3, changePercent: -0.4, volume: 44, area: 76 },
+];
+
+const columns: DataTableColumn<DistrictRow>[] = [
+  {
+    id: 'code',
+    header: 'Mã',
+    cell: (r) => <span className="font-mono text-foreground">{r.code}</span>,
+    width: '64px',
+    sortable: true,
+    sortValue: (r) => r.code,
+  },
+  {
+    id: 'name',
+    header: 'Khu vực',
+    cell: (r) => <span>{r.name}</span>,
+    sortable: true,
+    sortValue: (r) => r.name,
+  },
+  {
+    id: 'price',
+    header: 'Giá TB (tr/m²)',
+    cell: (r) => r.price.toFixed(1),
+    align: 'right',
+    numeric: true,
+    sortable: true,
+    sortValue: (r) => r.price,
+  },
+  {
+    id: 'delta',
+    header: 'Δ 7d',
+    cell: (r) => <PriceDelta value={r.changePercent} size="sm" />,
+    align: 'right',
+    sortable: true,
+    sortValue: (r) => r.changePercent,
+  },
+  {
+    id: 'area',
+    header: 'DT TB (m²)',
+    cell: (r) => r.area,
+    align: 'right',
+    numeric: true,
+    sortable: true,
+    sortValue: (r) => r.area,
+  },
+  {
+    id: 'volume',
+    header: 'KL',
+    cell: (r) => r.volume,
+    align: 'right',
+    numeric: true,
+    sortable: true,
+    sortValue: (r) => r.volume,
+  },
+];
+
+const sidebarItems = [
+  { icon: Home, label: 'Trang chủ' },
+  { icon: Building2, label: 'Listings' },
+  { icon: Map, label: 'Bản đồ' },
+  { icon: LineChart, label: 'Thị trường' },
+  { icon: Activity, label: 'Hoạt động' },
+];
+
+export default function DesignSystemDemoPage() {
+  return (
+    <DashboardLayout
+      sidebarCollapsed
+      ticker={<TickerStrip items={tickerItems} />}
+      sidebar={
+        <nav className="flex flex-col items-center gap-1 py-3">
+          {sidebarItems.map((item) => (
+            <button
+              key={item.label}
+              type="button"
+              title={item.label}
+              className="flex h-10 w-10 items-center justify-center rounded-md text-foreground-muted hover:bg-background-surface hover:text-foreground"
+            >
+              <item.icon className="h-4 w-4" />
+            </button>
+          ))}
+        </nav>
+      }
+      header={
+        <CompactHeader
+          logo={
+            <span className="font-mono text-sm font-semibold text-primary">
+              GOODGO
+            </span>
+          }
+          breadcrumb={
+            <span>
+              <span className="text-foreground-dim">/</span> Design System{' '}
+              <span className="text-foreground-dim">/</span> Demo
+            </span>
+          }
+          actions={
+            <>
+              <button
+                type="button"
+                className="flex h-8 w-8 items-center justify-center rounded-md text-foreground-muted hover:bg-background-surface"
+                aria-label="Thông báo"
+              >
+                <Bell className="h-4 w-4" />
+              </button>
+              <button
+                type="button"
+                className="flex h-8 w-8 items-center justify-center rounded-md text-foreground-muted hover:bg-background-surface"
+                aria-label="Tài khoản"
+              >
+                <User2 className="h-4 w-4" />
+              </button>
+            </>
+          }
+        />
+      }
+      statusBar={
+        <>
+          <span>
+            <span className="mr-1 inline-block h-2 w-2 rounded-full bg-signal-up" />
+            Online
+          </span>
+          <span>Cập nhật: 14:32:07</span>
+          <span className="ml-auto font-mono">GGX 1,245.82 +1.3%</span>
+        </>
+      }
+    >
+      <div className="space-y-6">
+        <section className="flex items-end justify-between">
+          <MarketIndex
+            name="GGX Market Index"
+            value="1,245.82"
+            changePercent={1.32}
+            change={+16.24}
+            window="24h"
+          />
+          <div className="flex gap-2 text-[11px] text-foreground-muted">
+            <span className="rounded-sm border border-border px-2 py-0.5">24h</span>
+            <span className="rounded-sm border border-border px-2 py-0.5">7d</span>
+            <span className="rounded-sm border border-border px-2 py-0.5">30d</span>
+          </div>
+        </section>
+
+        <section className="grid grid-cols-2 gap-3 md:grid-cols-4">
+          <StatCard label="Tổng tin" value="12,345" sublabel="24h" delta={0.8} />
+          <StatCard label="Giao dịch" value="234" sublabel="24h" delta={-2.1} />
+          <StatCard label="Giá TB" value="45.2" unit="tr/m²" sublabel="7d" delta={1.8} />
+          <StatCard label="Biến động" value="1.32" unit="%" sublabel="7d" delta={1.32} />
+        </section>
+
+        <section>
+          <h2 className="mb-2 text-xs font-semibold uppercase tracking-wide text-foreground-muted">
+            Bảng giá top khu vực
+          </h2>
+          <DataTable
+            columns={columns}
+            data={rows}
+            getRowId={(r) => r.id}
+            defaultSortId="price"
+            defaultSortDir="desc"
+          />
+        </section>
+
+        <section className="grid gap-3 md:grid-cols-3">
+          <div className="rounded-md border border-border bg-background-elevated p-4">
+            <h3 className="mb-2 text-xs font-semibold uppercase tracking-wide text-foreground-muted">
+              PriceDelta variants
+            </h3>
+            <div className="flex flex-col gap-1 text-sm">
+              <PriceDelta value={2.34} />
+              <PriceDelta value={-1.21} />
+              <PriceDelta value={0} />
+              <PriceDelta value={5.5} size="lg" />
+            </div>
+          </div>
+          <div className="rounded-md border border-border bg-background-elevated p-4">
+            <h3 className="mb-2 text-xs font-semibold uppercase tracking-wide text-foreground-muted">
+              Signal palette
+            </h3>
+            <div className="flex flex-col gap-2 text-xs">
+              <div className="flex items-center gap-2">
+                <span className="h-3 w-3 rounded-sm bg-signal-up" /> signal-up
+              </div>
+              <div className="flex items-center gap-2">
+                <span className="h-3 w-3 rounded-sm bg-signal-down" /> signal-down
+              </div>
+              <div className="flex items-center gap-2">
+                <span className="h-3 w-3 rounded-sm bg-signal-neutral" /> signal-neutral
+              </div>
+            </div>
+          </div>
+          <div className="rounded-md border border-border bg-background-elevated p-4">
+            <h3 className="mb-2 text-xs font-semibold uppercase tracking-wide text-foreground-muted">
+              Typography
+            </h3>
+            <div className="flex flex-col gap-1">
+              <span className="font-mono text-data-lg">1,245.82</span>
+              <span className="font-mono text-data-md">45.2 tr/m²</span>
+              <span className="font-mono text-data-sm">+1.32%</span>
+              <span className="text-sm text-foreground-muted">Inter body</span>
+            </div>
+          </div>
+        </section>
+      </div>
+    </DashboardLayout>
+  );
+}
diff --git a/apps/web/app/[locale]/layout.tsx b/apps/web/app/[locale]/layout.tsx
index 26bcc4b..047504f 100644
--- a/apps/web/app/[locale]/layout.tsx
+++ b/apps/web/app/[locale]/layout.tsx
@@ -1,5 +1,5 @@
 import type { Metadata, Viewport } from 'next';
-import { Inter } from 'next/font/google';
+import { Inter, JetBrains_Mono } from 'next/font/google';
 import { notFound } from 'next/navigation';
 import { NextIntlClientProvider } from 'next-intl';
 import { getMessages, getTranslations } from 'next-intl/server';
@@ -20,6 +20,12 @@ const inter = Inter({
   variable: '--font-inter',
 });
 
+const jetbrainsMono = JetBrains_Mono({
+  subsets: ['latin'],
+  display: 'swap',
+  variable: '--font-jetbrains-mono',
+});
+
 const siteUrl = process.env['NEXT_PUBLIC_SITE_URL'] || 'https://goodgo.vn';
 
 export const viewport: Viewport = {
@@ -111,7 +117,11 @@ export default async function LocaleLayout({
   const t = await getTranslations({ locale, namespace: 'common' });
 
   return (
-    <html lang={locale} suppressHydrationWarning className={inter.variable}>
+    <html
+      lang={locale}
+      suppressHydrationWarning
+      className={`${inter.variable} ${jetbrainsMono.variable}`}
+    >
       <body className={inter.className}>
         <JsonLd data={generateWebsiteJsonLd(siteUrl)} />
         <a
diff --git a/apps/web/app/globals.css b/apps/web/app/globals.css
index c79475b..6b4cf15 100644
--- a/apps/web/app/globals.css
+++ b/apps/web/app/globals.css
@@ -4,44 +4,78 @@
 
 @layer base {
   :root {
-    --background: 0 0% 100%;
-    --foreground: 222.2 84% 4.9%;
+    /* Light mode override (dark-first architecture) */
+    --background: 0 0% 97%;
+    --background-elevated: 0 0% 100%;
+    --background-surface: 220 14% 96%;
+    --foreground: 220 20% 12%;
+    --foreground-muted: 215 12% 45%;
+    --foreground-dim: 215 12% 60%;
     --card: 0 0% 100%;
-    --card-foreground: 222.2 84% 4.9%;
+    --card-foreground: 220 20% 12%;
     --primary: 142.1 76.2% 36.3%;
     --primary-foreground: 355.7 100% 97.3%;
+    --primary-hover: 142.1 76.2% 30%;
     --secondary: 210 40% 96.1%;
     --secondary-foreground: 222.2 47.4% 11.2%;
     --muted: 210 40% 96.1%;
     --muted-foreground: 215.4 16.3% 46.9%;
     --accent: 210 40% 96.1%;
     --accent-foreground: 222.2 47.4% 11.2%;
+    --accent-blue: 210 100% 45%;
+    --accent-purple: 270 70% 50%;
     --destructive: 0 84.2% 60.2%;
     --destructive-foreground: 210 40% 98%;
-    --border: 214.3 31.8% 91.4%;
+    --success: 142.1 76.2% 36.3%;
+    --warning: 45 93% 47%;
+    --signal-up: 142 72% 38%;
+    --signal-up-bg: 142 72% 38%;
+    --signal-down: 0 84% 55%;
+    --signal-down-bg: 0 84% 55%;
+    --signal-neutral: 45 93% 45%;
+    --signal-neutral-bg: 45 93% 45%;
+    --border: 220 13% 88%;
+    --border-strong: 220 13% 78%;
     --input: 214.3 31.8% 91.4%;
     --ring: 142.1 76.2% 36.3%;
     --radius: 0.5rem;
   }
 
   .dark {
-    --background: 222.2 84% 4.9%;
-    --foreground: 210 40% 98%;
-    --card: 222.2 84% 4.9%;
-    --card-foreground: 210 40% 98%;
-    --primary: 142.1 70.6% 45.3%;
-    --primary-foreground: 144.9 80.4% 10%;
+    /* Terminal dark theme (primary) */
+    --background: 220 20% 4%;
+    --background-elevated: 220 18% 7%;
+    --background-surface: 220 16% 10%;
+    --foreground: 210 20% 90%;
+    --foreground-muted: 215 15% 55%;
+    --foreground-dim: 215 12% 35%;
+    --card: 220 18% 7%;
+    --card-foreground: 210 20% 90%;
+    --primary: 142 72% 42%;
+    --primary-foreground: 0 0% 100%;
+    --primary-hover: 142 72% 36%;
     --secondary: 217.2 32.6% 17.5%;
     --secondary-foreground: 210 40% 98%;
     --muted: 217.2 32.6% 17.5%;
-    --muted-foreground: 215 20.2% 65.1%;
+    --muted-foreground: 215 15% 55%;
     --accent: 217.2 32.6% 17.5%;
     --accent-foreground: 210 40% 98%;
-    --destructive: 0 62.8% 30.6%;
+    --accent-blue: 210 100% 56%;
+    --accent-purple: 270 70% 60%;
+    --destructive: 0 84% 60%;
     --destructive-foreground: 210 40% 98%;
-    --border: 217.2 32.6% 17.5%;
+    --success: 142 72% 42%;
+    --warning: 45 93% 58%;
+    --signal-up: 142 72% 50%;
+    --signal-up-bg: 142 72% 50%;
+    --signal-down: 0 84% 60%;
+    --signal-down-bg: 0 84% 60%;
+    --signal-neutral: 45 93% 58%;
+    --signal-neutral-bg: 45 93% 58%;
+    --border: 218 16% 16%;
+    --border-strong: 218 16% 24%;
     --input: 217.2 32.6% 17.5%;
-    --ring: 142.1 76.2% 36.3%;
+    --ring: 142 72% 42%;
   }
 
   * {
@@ -50,6 +84,13 @@
 
   body {
     @apply bg-background text-foreground;
+    font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
+  }
+
+  /* Data/number cells: tabular-nums for alignment */
+  .font-mono,
+  [data-numeric] {
+    font-variant-numeric: tabular-nums;
   }
 }
 
@@ -77,3 +118,45 @@
 .mapboxgl-ctrl-attrib a {
   color: hsl(var(--muted-foreground));
 }
+
+/* Ticker scroll animation */
+@keyframes ticker-scroll {
+  0% {
+    transform: translateX(0);
+  }
+  100% {
+    transform: translateX(-50%);
+  }
+}
+.animate-ticker {
+  animation: ticker-scroll 60s linear infinite;
+}
+.animate-ticker:hover {
+  animation-play-state: paused;
+}
+
+/* Signal flash for price updates */
+@keyframes signal-flash-up {
+  0%,
+  100% {
+    background-color: transparent;
+  }
+  30% {
+    background-color: hsl(var(--signal-up-bg) / 0.2);
+  }
+}
+@keyframes signal-flash-down {
+  0%,
+  100% {
+    background-color: transparent;
+  }
+  30% {
+    background-color: hsl(var(--signal-down-bg) / 0.2);
+  }
+}
+.flash-up {
+  animation: signal-flash-up 1s ease-out;
+}
+.flash-down {
+  animation: signal-flash-down 1s ease-out;
+}
diff --git a/apps/web/tailwind.config.ts b/apps/web/tailwind.config.ts
index 90c09ee..5479b27 100644
--- a/apps/web/tailwind.config.ts
+++ b/apps/web/tailwind.config.ts
@@ -8,16 +8,39 @@ const config: Config = {
     extend: {
       fontFamily: {
         sans: ['var(--font-inter)', 'system-ui', 'sans-serif'],
+        mono: ['var(--font-jetbrains-mono)', 'ui-monospace', 'SFMono-Regular', 'monospace'],
+      },
+      fontSize: {
+        ticker: ['0.8125rem', { lineHeight: '1', letterSpacing: '0.01em' }],
+        'data-sm': ['0.75rem', { lineHeight: '1.2' }],
+        'data-md': ['0.875rem', { lineHeight: '1.3' }],
+        'data-lg': ['1.25rem', { lineHeight: '1.2' }],
+      },
+      spacing: {
+        cell: '0.5rem',
+        row: '2.25rem',
+        'ticker-bar': '2rem',
+        'header-compact': '3rem',
       },
       colors: {
         border: 'hsl(var(--border))',
+        'border-strong': 'hsl(var(--border-strong))',
         input: 'hsl(var(--input))',
         ring: 'hsl(var(--ring))',
-        background: 'hsl(var(--background))',
-        foreground: 'hsl(var(--foreground))',
+        background: {
+          DEFAULT: 'hsl(var(--background))',
+          elevated: 'hsl(var(--background-elevated))',
+          surface: 'hsl(var(--background-surface))',
+        },
+        foreground: {
+          DEFAULT: 'hsl(var(--foreground))',
+          muted: 'hsl(var(--foreground-muted))',
+          dim: 'hsl(var(--foreground-dim))',
+        },
         primary: {
           DEFAULT: 'hsl(var(--primary))',
           foreground: 'hsl(var(--primary-foreground))',
+          hover: 'hsl(var(--primary-hover))',
         },
         secondary: {
           DEFAULT: 'hsl(var(--secondary))',
@@ -34,17 +57,33 @@ const config: Config = {
         accent: {
           DEFAULT: 'hsl(var(--accent))',
           foreground: 'hsl(var(--accent-foreground))',
+          blue: 'hsl(var(--accent-blue))',
+          purple: 'hsl(var(--accent-purple))',
         },
         card: {
           DEFAULT: 'hsl(var(--card))',
           foreground: 'hsl(var(--card-foreground))',
         },
+        signal: {
+          up: 'hsl(var(--signal-up))',
+          'up-bg': 'hsl(var(--signal-up-bg) / 0.1)',
+          down: 'hsl(var(--signal-down))',
+          'down-bg': 'hsl(var(--signal-down-bg) / 0.1)',
+          neutral: 'hsl(var(--signal-neutral))',
+          'neutral-bg': 'hsl(var(--signal-neutral-bg) / 0.1)',
+        },
+        success: 'hsl(var(--success))',
+        warning: 'hsl(var(--warning))',
       },
       borderRadius: {
         lg: 'var(--radius)',
         md: 'calc(var(--radius) - 2px)',
         sm: 'calc(var(--radius) - 4px)',
       },
+      boxShadow: {
+        'elevation-1': '0 1px 2px rgba(0, 0, 0, 0.3)',
+        'elevation-2': '0 4px 12px rgba(0, 0, 0, 0.4)',
+      },
     },
   },
   plugins: [tailwindcssAnimate],