diff --git a/src/App.tsx b/src/App.tsx
index 052b459..7db9ea4 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -103,7 +103,7 @@ export default function App() {
       // 'checking' / 'redirecting' — brief blank while we check preferences
       // or hand off to the WebView.
       return (
-        <div style={{ background: '#09090b', height: '100dvh', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
+        <div className="app-splash">
           <div className="spinner" />
         </div>
       );
diff --git a/src/BiometricLock.tsx b/src/BiometricLock.tsx
index 06de442..bc480c1 100644
--- a/src/BiometricLock.tsx
+++ b/src/BiometricLock.tsx
@@ -46,7 +46,7 @@ export default function BiometricLock({ onUnlocked, onFallback }: Props) {
 
   return (
     <div className="setup-root">
-      <div className="setup-card" style={{ alignItems: 'center', textAlign: 'center' }}>
+      <div className="setup-card center">
         {checking ? (
           <div className="spinner" />
         ) : (
diff --git a/src/BiometricSetup.tsx b/src/BiometricSetup.tsx
index 306ff14..dcf2800 100644
--- a/src/BiometricSetup.tsx
+++ b/src/BiometricSetup.tsx
@@ -35,13 +35,13 @@ export default function BiometricSetup({ onDone }: Props) {
 
   return (
     <div className="setup-root">
-      <div className="setup-card" style={{ alignItems: 'center', textAlign: 'center' }}>
-        <div className="logo-mark" aria-hidden="true">
+      <div className="setup-card center">
+        <div className="logo-mark icon-accent" aria-hidden="true">
           <svg viewBox="0 0 40 40" fill="none" xmlns="http://www.w3.org/2000/svg">
-            <rect width="40" height="40" rx="10" fill="#6366f1" fillOpacity="0.15" />
+            <rect width="40" height="40" rx="10" fill="currentColor" fillOpacity="0.15" />
             <path
               d="M20 12a6 6 0 0 0-6 6v2a6 6 0 0 0 .5 2.4M20 12a6 6 0 0 1 6 6v2c0 3-1 5-2 6.5M14 20v2c0 2.5.7 4.3 1.8 5.8M26 20v2c0 1.3-.2 2.6-.6 3.8M17.5 27.5c.8.9 1.8 1.7 2.9 2.2M11 14a9 9 0 0 1 18 0"
-              stroke="#6366f1"
+              stroke="currentColor"
               strokeWidth="1.6"
               strokeLinecap="round"
               strokeLinejoin="round"
diff --git a/src/LoadingScreen.tsx b/src/LoadingScreen.tsx
index 2dd3e67..aa0bf45 100644
--- a/src/LoadingScreen.tsx
+++ b/src/LoadingScreen.tsx
@@ -86,7 +86,7 @@ export default function LoadingScreen({ onReady }: Props) {
 
   return (
     <div className="setup-root">
-      <div className="setup-card" style={{ alignItems: 'center', textAlign: 'center' }}>
+      <div className="setup-card center">
         {error ? (
           <>
             <h1 className="setup-title">Couldn't start local server</h1>
diff --git a/src/LogoMark.tsx b/src/LogoMark.tsx
new file mode 100644
index 0000000..7a38823
--- /dev/null
+++ b/src/LogoMark.tsx
@@ -0,0 +1,36 @@
+interface Props {
+  /** Pixel size of the (square) mark. Defaults to the CSS .logo-mark size. */
+  size?: number;
+  className?: string;
+}
+
+/**
+ * The Bill Tracker brand mark — a calm green bar chart with a checkmark.
+ * Single source for the logo across the native shell (kept in sync with the web
+ * app's client/public/brand/mark.svg). Shared so no screen hand-inlines the SVG.
+ */
+export default function LogoMark({ size, className = 'logo-mark' }: Props) {
+  return (
+    <span className={className} style={size ? { width: size, height: size } : undefined} aria-hidden="true">
+      <svg viewBox="0 0 256 256" xmlns="http://www.w3.org/2000/svg" role="img" aria-label="Bill Tracker">
+        <defs>
+          <linearGradient id="bt-bars" x1="48" x2="206" y1="210" y2="50" gradientUnits="userSpaceOnUse">
+            <stop offset="0" stopColor="#1e9f93" />
+            <stop offset="0.58" stopColor="#40c878" />
+            <stop offset="1" stopColor="#96e6a1" />
+          </linearGradient>
+          <linearGradient id="bt-ink" x1="34" x2="222" y1="34" y2="222" gradientUnits="userSpaceOnUse">
+            <stop offset="0" stopColor="#172025" />
+            <stop offset="1" stopColor="#0f1417" />
+          </linearGradient>
+        </defs>
+        <rect width="256" height="256" rx="58" fill="url(#bt-ink)" />
+        <rect x="61" y="123" width="28" height="59" rx="8" fill="url(#bt-bars)" opacity="0.86" />
+        <rect x="101" y="95" width="28" height="87" rx="8" fill="url(#bt-bars)" opacity="0.94" />
+        <rect x="141" y="69" width="28" height="113" rx="8" fill="url(#bt-bars)" />
+        <path d="M62 80.5 97.5 116 190 45" fill="none" stroke="#96e6a1" strokeLinecap="round" strokeLinejoin="round" strokeWidth="18" />
+        <path d="M62 80.5 97.5 116 190 45" fill="none" stroke="#40c878" strokeLinecap="round" strokeLinejoin="round" strokeWidth="10" />
+      </svg>
+    </span>
+  );
+}
diff --git a/src/SetupScreen.tsx b/src/SetupScreen.tsx
index 8147667..4acaa9d 100644
--- a/src/SetupScreen.tsx
+++ b/src/SetupScreen.tsx
@@ -1,4 +1,5 @@
 import { useState } from 'react';
+import LogoMark from './LogoMark';
 
 interface Props {
   onConnect: (url: string) => void;
@@ -33,7 +34,22 @@ function isInsecureUrl(url: string): boolean {
   }
 }
 
+const PhoneIcon = (
+  <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+    <rect x="6" y="2" width="12" height="20" rx="3" />
+    <path d="M11 18h2" />
+  </svg>
+);
+
+const ServerIcon = (
+  <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+    <rect x="3" y="4" width="18" height="12" rx="2" />
+    <path d="M8 20h8M12 16v4" />
+  </svg>
+);
+
 export default function SetupScreen({ onConnect, onLocalMode }: Props) {
+  const [mode, setMode] = useState<'choose' | 'server'>('choose');
   const [url, setUrl] = useState('');
   const [error, setError] = useState('');
   const [insecureAck, setInsecureAck] = useState(false);
@@ -63,71 +79,87 @@ export default function SetupScreen({ onConnect, onLocalMode }: Props) {
   return (
     <div className="setup-root">
       <div className="setup-card">
-        {/* Logo mark */}
-        <div className="logo-mark" aria-hidden="true">
-          <svg viewBox="0 0 40 40" fill="none" xmlns="http://www.w3.org/2000/svg">
-            <rect width="40" height="40" rx="10" fill="#6366f1" fillOpacity="0.15" />
-            <path d="M20 8v4M20 28v4M8 20h4M28 20h4" stroke="#6366f1" strokeWidth="2" strokeLinecap="round" />
-            <rect x="13" y="13" width="14" height="14" rx="3" stroke="#6366f1" strokeWidth="2" />
-            <path d="M16 20h8M20 16v8" stroke="#6366f1" strokeWidth="1.5" strokeLinecap="round" />
-          </svg>
+        <div className="brand">
+          <LogoMark />
+          <div className="wordmark">Bill <b>Tracker</b></div>
+          <p className="setup-subtitle">Calm command for household money.</p>
         </div>
 
-        <h1 className="setup-title">Bill Tracker</h1>
-        <p className="setup-subtitle">Connect to your server to get started.</p>
+        {mode === 'choose' ? (
+          <>
+            <div className="choices">
+              {/* Local first: the simplest, most private option is one tap. */}
+              <button type="button" className="door" onClick={onLocalMode}>
+                <span className="door__icon">{PhoneIcon}</span>
+                <span className="door__body">
+                  <span className="door__title">Run on this phone</span>
+                  <span className="door__desc">Private and offline. Nothing leaves your device.</span>
+                </span>
+                <span className="door__chev" aria-hidden="true">›</span>
+              </button>
 
-        <div className="form-group">
-          <label className="form-label" htmlFor="server-url">Server URL</label>
-          <input
-            id="server-url"
-            className="form-input"
-            type="url"
-            inputMode="url"
-            autoCapitalize="none"
-            autoCorrect="off"
-            spellCheck={false}
-            placeholder="https://bills.yourdomain.com"
-            value={url}
-            onChange={e => { setUrl(e.target.value); setError(''); setInsecureAck(false); }}
-            onKeyDown={handleKey}
-            disabled={connecting}
-          />
-          {error && <p className="form-error">{error}</p>}
-          {insecureAck && (
-            <p className="form-error">
-              This is an insecure <strong>http://</strong> address — your password will be sent
-              unencrypted. Only continue on a network you trust. Tap again to connect anyway.
-            </p>
-          )}
-          <p className="form-hint">
-            The address of your Bill Tracker server. Must be reachable from this device.
-          </p>
-        </div>
+              <button
+                type="button"
+                className="door"
+                onClick={() => { setMode('server'); setError(''); }}
+              >
+                <span className="door__icon">{ServerIcon}</span>
+                <span className="door__body">
+                  <span className="door__title">Connect to a server</span>
+                  <span className="door__desc">Your self-hosted Bill Tracker.</span>
+                </span>
+                <span className="door__chev" aria-hidden="true">›</span>
+              </button>
+            </div>
+            <p className="setup-footer">You can switch modes later by clearing the app's storage.</p>
+          </>
+        ) : (
+          <>
+            <div className="form-group">
+              <label className="form-label" htmlFor="server-url">Server URL</label>
+              <input
+                id="server-url"
+                className="form-input"
+                type="url"
+                inputMode="url"
+                autoCapitalize="none"
+                autoCorrect="off"
+                spellCheck={false}
+                placeholder="https://bills.yourdomain.com"
+                value={url}
+                onChange={e => { setUrl(e.target.value); setError(''); setInsecureAck(false); }}
+                onKeyDown={handleKey}
+                disabled={connecting}
+                autoFocus
+              />
+              {error && <p className="form-error">{error}</p>}
+              {insecureAck && (
+                <p className="form-error">
+                  This is an insecure <strong>http://</strong> address — your password will be sent
+                  unencrypted. Only continue on a network you trust. Tap again to connect anyway.
+                </p>
+              )}
+              <p className="form-hint">
+                The address of your Bill Tracker server. Must be reachable from this device.
+              </p>
+            </div>
 
-        <button
-          className="btn-primary"
-          onClick={handleConnect}
-          disabled={connecting || !url.trim()}
-        >
-          {connecting ? 'Connecting…' : insecureAck ? 'Connect anyway' : 'Continue'}
-        </button>
-
-        <div className="divider">
-          <span>or</span>
-        </div>
-
-        <button
-          className="btn-secondary"
-          style={{ cursor: 'pointer' }}
-          onClick={onLocalMode}
-          disabled={connecting}
-        >
-          <span>Run on this phone</span>
-        </button>
-
-        <p className="setup-footer">
-          To change your server later, go to <strong>Android Settings → Apps → Bill Tracker → Clear Storage</strong>.
-        </p>
+            <button
+              className="btn-primary"
+              onClick={handleConnect}
+              disabled={connecting || !url.trim()}
+            >
+              {connecting ? 'Connecting…' : insecureAck ? 'Connect anyway' : 'Continue'}
+            </button>
+            <button
+              className="btn-secondary"
+              onClick={() => { setMode('choose'); setError(''); setInsecureAck(false); }}
+              disabled={connecting}
+            >
+              Back
+            </button>
+          </>
+        )}
       </div>
     </div>
   );
diff --git a/src/index.css b/src/index.css
index d119c66..1b35fc1 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1,3 +1,9 @@
+@import './theme.css';
+
+/* Native shell styles. Every value below resolves to a token from theme.css —
+   no raw hex, so the whole shell rethemes from one place. All screens share
+   these classes, so a change here cascades to setup, login, loading, biometric. */
+
 *, *::before, *::after {
   box-sizing: border-box;
   margin: 0;
@@ -6,19 +12,28 @@
 
 html, body, #root {
   height: 100%;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
+  font-family: var(--font-sans);
   -webkit-font-smoothing: antialiased;
 }
 
-/* ── Setup screen ──────────────────────────────────────────────── */
+body {
+  background: var(--color-bg);
+  color: var(--color-text);
+}
 
-.setup-root {
+/* ── App shell / splash ─────────────────────────────────────────── */
+
+.setup-root,
+.app-splash {
   min-height: 100dvh;
-  background: #09090b;
+  background: var(--color-bg);
   display: flex;
   align-items: center;
   justify-content: center;
-  padding: 1.5rem;
+}
+
+.setup-root {
+  padding: var(--space-5) var(--space-4);
 }
 
 .setup-card {
@@ -26,33 +41,147 @@ html, body, #root {
   max-width: 400px;
   display: flex;
   flex-direction: column;
-  gap: 1.25rem;
+  gap: var(--space-4);
+}
+
+.setup-card.center {
+  align-items: center;
+  text-align: center;
+}
+
+/* ── Brand block ────────────────────────────────────────────────── */
+
+.brand {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: var(--space-2);
+  margin: var(--space-4) 0 var(--space-2);
 }
 
 .logo-mark {
   width: 56px;
   height: 56px;
-  margin: 0 auto 0.5rem;
+  border-radius: 26%;
+  overflow: hidden;
+  display: block;
 }
 
 .logo-mark svg {
   width: 100%;
   height: 100%;
+  display: block;
+}
+
+.wordmark {
+  font-size: 1.5rem;
+  font-weight: 800;
+  letter-spacing: -0.02em;
+  color: var(--color-text);
+}
+
+.wordmark b {
+  color: var(--color-primary);
+  font-weight: 800;
 }
 
 .setup-title {
   text-align: center;
   font-size: 1.5rem;
-  font-weight: 700;
-  color: #fafafa;
+  font-weight: 800;
+  color: var(--color-text);
   letter-spacing: -0.02em;
+  text-wrap: balance;
 }
 
 .setup-subtitle {
   text-align: center;
   font-size: 0.875rem;
-  color: #71717a;
-  margin-top: -0.75rem;
+  color: var(--color-text-muted);
+  line-height: 1.5;
+}
+
+/* Accent-colored icon wrapper (e.g. biometric fingerprint) */
+.icon-accent {
+  color: var(--color-primary);
+}
+
+/* ── Choice "doors" (first-run mode picker) ─────────────────────── */
+
+.choices {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-3);
+}
+
+.door {
+  display: flex;
+  align-items: center;
+  gap: var(--space-3);
+  width: 100%;
+  text-align: left;
+  background: var(--color-surface);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-lg);
+  padding: var(--space-4);
+  color: var(--color-text);
+  cursor: pointer;
+  transition: border-color 0.15s, background 0.15s, transform 0.05s;
+  -webkit-tap-highlight-color: transparent;
+}
+
+.door:hover {
+  border-color: var(--color-border-strong);
+}
+
+.door:active {
+  transform: scale(0.99);
+}
+
+.door:focus-visible {
+  outline: 2px solid var(--color-ring);
+  outline-offset: 2px;
+}
+
+.door__icon {
+  width: 42px;
+  height: 42px;
+  border-radius: var(--radius-md);
+  background: var(--color-primary-tint);
+  color: var(--color-primary);
+  display: grid;
+  place-items: center;
+  flex: 0 0 auto;
+}
+
+.door__icon svg {
+  width: 21px;
+  height: 21px;
+}
+
+.door__body {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.door__title {
+  font-size: 0.9375rem;
+  font-weight: 700;
+  color: var(--color-text);
+}
+
+.door__desc {
+  font-size: 0.8125rem;
+  color: var(--color-text-muted);
+  line-height: 1.4;
+}
+
+.door__chev {
+  margin-left: auto;
+  color: var(--color-text-faint);
+  font-size: 1.25rem;
+  line-height: 1;
 }
 
 /* ── Form ───────────────────────────────────────────────────────── */
@@ -60,7 +189,7 @@ html, body, #root {
 .form-group {
   display: flex;
   flex-direction: column;
-  gap: 0.375rem;
+  gap: var(--space-1);
 }
 
 .form-label {
@@ -68,29 +197,29 @@ html, body, #root {
   font-weight: 600;
   letter-spacing: 0.06em;
   text-transform: uppercase;
-  color: #a1a1aa;
+  color: var(--color-text-muted);
 }
 
 .form-input {
   width: 100%;
-  padding: 0.75rem 1rem;
-  background: #18181b;
-  border: 1px solid #27272a;
-  border-radius: 0.625rem;
-  color: #fafafa;
+  padding: var(--space-3) var(--space-4);
+  background: var(--color-surface-2);
+  border: 1px solid var(--color-border);
+  border-radius: var(--radius-md);
+  color: var(--color-text);
   font-size: 0.9375rem;
   outline: none;
-  transition: border-color 0.15s;
+  transition: border-color 0.15s, box-shadow 0.15s;
   -webkit-appearance: none;
 }
 
 .form-input::placeholder {
-  color: #52525b;
+  color: var(--color-text-faint);
 }
 
 .form-input:focus {
-  border-color: #6366f1;
-  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
+  border-color: var(--color-primary);
+  box-shadow: 0 0 0 3px var(--color-ring);
 }
 
 .form-input:disabled {
@@ -99,37 +228,43 @@ html, body, #root {
 
 .form-error {
   font-size: 0.8125rem;
-  color: #f87171;
+  color: var(--color-danger);
+  line-height: 1.5;
 }
 
 .form-hint {
   font-size: 0.75rem;
-  color: #52525b;
+  color: var(--color-text-faint);
   line-height: 1.5;
 }
 
-/* ── Buttons ─────────────────────────────────────────────────────── */
+/* ── Buttons ────────────────────────────────────────────────────── */
 
-.btn-primary {
+.btn-primary,
+.btn-secondary {
   width: 100%;
   padding: 0.8125rem 1rem;
-  background: #6366f1;
-  color: #fff;
-  border: none;
-  border-radius: 0.625rem;
+  border-radius: var(--radius-md);
   font-size: 0.9375rem;
   font-weight: 600;
   cursor: pointer;
-  transition: background 0.15s, opacity 0.15s;
+  transition: background 0.15s, border-color 0.15s, color 0.15s, opacity 0.15s;
   -webkit-tap-highlight-color: transparent;
 }
 
+.btn-primary {
+  background: var(--color-primary);
+  color: var(--color-on-primary);
+  border: none;
+  font-weight: 700;
+}
+
 .btn-primary:hover:not(:disabled) {
-  background: #4f46e5;
+  background: var(--color-primary-hover);
 }
 
 .btn-primary:active:not(:disabled) {
-  background: #4338ca;
+  background: var(--color-primary-active);
 }
 
 .btn-primary:disabled {
@@ -138,26 +273,18 @@ html, body, #root {
 }
 
 .btn-secondary {
-  width: 100%;
-  padding: 0.8125rem 1rem;
   background: transparent;
-  color: #a1a1aa;
-  border: 1px solid #27272a;
-  border-radius: 0.625rem;
-  font-size: 0.9375rem;
-  font-weight: 500;
-  cursor: pointer;
+  color: var(--color-text-dim);
+  border: 1px solid var(--color-border);
   display: flex;
   align-items: center;
   justify-content: center;
-  gap: 0.625rem;
-  transition: border-color 0.15s, color 0.15s;
-  -webkit-tap-highlight-color: transparent;
+  gap: var(--space-2);
 }
 
 .btn-secondary:hover:not(:disabled) {
-  border-color: #3f3f46;
-  color: #d4d4d8;
+  border-color: var(--color-border-strong);
+  color: var(--color-text);
 }
 
 .btn-secondary:disabled {
@@ -165,63 +292,47 @@ html, body, #root {
   cursor: not-allowed;
 }
 
-.badge {
-  font-size: 0.6875rem;
-  font-weight: 600;
-  text-transform: uppercase;
-  letter-spacing: 0.05em;
-  background: #27272a;
-  color: #71717a;
-  padding: 0.1875rem 0.5rem;
-  border-radius: 9999px;
+.btn-primary:focus-visible,
+.btn-secondary:focus-visible,
+.form-input:focus-visible {
+  outline: 2px solid var(--color-ring);
+  outline-offset: 2px;
 }
 
-/* ── Divider ─────────────────────────────────────────────────────── */
-
-.divider {
-  display: flex;
-  align-items: center;
-  gap: 0.75rem;
-  color: #3f3f46;
-  font-size: 0.75rem;
-  text-transform: uppercase;
-  letter-spacing: 0.06em;
-}
-
-.divider::before,
-.divider::after {
-  content: '';
-  flex: 1;
-  height: 1px;
-  background: #27272a;
-}
-
-/* ── Footer note ─────────────────────────────────────────────────── */
+/* ── Footer note ────────────────────────────────────────────────── */
 
 .setup-footer {
   font-size: 0.75rem;
-  color: #3f3f46;
+  color: var(--color-text-faint);
   text-align: center;
   line-height: 1.6;
-  padding: 0 0.25rem;
+  padding: 0 var(--space-1);
 }
 
 .setup-footer strong {
-  color: #52525b;
+  color: var(--color-text-muted);
   font-weight: 500;
 }
 
-/* ── Spinner (shown briefly while checking preferences) ─────────── */
+/* ── Spinner ────────────────────────────────────────────────────── */
 
 .spinner {
   width: 28px;
   height: 28px;
-  border: 2px solid #27272a;
-  border-top-color: #6366f1;
+  border: 2px solid var(--color-border);
+  border-top-color: var(--color-primary);
   border-radius: 50%;
   animation: spin 0.7s linear infinite;
 }
 
-@keyframes spin {
-  to { transform: rotate(360deg); }
+@media (prefers-reduced-motion: reduce) {
+  .spinner {
+    animation-duration: 1.6s;
+  }
+}
+
+@keyframes spin {
+  to {
+    transform: rotate(360deg);
+  }
 }
diff --git a/src/theme.css b/src/theme.css
new file mode 100644
index 0000000..6b418e9
--- /dev/null
+++ b/src/theme.css
@@ -0,0 +1,73 @@
+/* ─────────────────────────────────────────────────────────────────────────────
+   Design tokens — the single source of truth for the native shell's look.
+   Change the brand HERE and every screen updates; components never hard-code a
+   raw color, radius, or spacing value. Two tiers:
+     1. primitives — the raw brand ramp (from the web app's mark.svg) + neutrals
+     2. semantic   — the roles components actually reference (--color-*, --radius-*, --space-*)
+   The "Seamless" direction: the web app's dark ink ground + spring-green accent,
+   so the native shell and the app it opens read as one product.
+   ───────────────────────────────────────────────────────────────────────────── */
+:root {
+  /* ── 1. Primitives ───────────────────────────────────────────────────────── */
+  /* Brand ramp — the greens straight out of client/public/brand/mark.svg */
+  --bt-green-300: #96e6a1; /* mint highlight   */
+  --bt-green-400: #57e08e;
+  --bt-green-500: #40c878; /* spring — primary */
+  --bt-green-600: #2fae67;
+  --bt-green-700: #1e9f93; /* teal depth       */
+
+  /* Green-tinted neutrals (chosen, not a default grey — biased toward the ink in mark.svg) */
+  --bt-ink-900: #0e1315; /* app background   */
+  --bt-ink-850: #111917; /* raised surface   */
+  --bt-ink-800: #141b1e;
+  --bt-ink-750: #182024; /* input field      */
+  --bt-line-800: #1e2925;
+  --bt-line-700: #25322e; /* hairline border  */
+  --bt-line-600: #2b3934; /* stronger border  */
+  --bt-fg:      #eef3f0;
+  --bt-fg-dim:  #b6c7be;
+  --bt-fg-muted:#8ea69c;
+  --bt-fg-faint:#5c6d66;
+
+  --bt-red-400:   #f2777a; /* danger  */
+  --bt-amber-400: #e0b64b; /* warning */
+
+  /* ── 2. Semantic roles (what components use) ─────────────────────────────── */
+  --color-bg:            var(--bt-ink-900);
+  --color-surface:       var(--bt-ink-850);
+  --color-surface-2:     var(--bt-ink-750);
+  --color-border:        var(--bt-line-700);
+  --color-border-strong: var(--bt-line-600);
+
+  --color-text:        var(--bt-fg);
+  --color-text-dim:    var(--bt-fg-dim);
+  --color-text-muted:  var(--bt-fg-muted);
+  --color-text-faint:  var(--bt-fg-faint);
+
+  --color-primary:       var(--bt-green-500);
+  --color-primary-hover: var(--bt-green-600);
+  --color-primary-active: var(--bt-green-700);
+  --color-on-primary:    #052012;
+  --color-primary-tint:  color-mix(in srgb, var(--bt-green-500) 14%, transparent);
+  --color-ring:          color-mix(in srgb, var(--bt-green-500) 32%, transparent);
+
+  --color-danger: var(--bt-red-400);
+  --color-warn:   var(--bt-amber-400);
+
+  /* ── Shape & rhythm ──────────────────────────────────────────────────────── */
+  --radius-sm:   0.5rem;
+  --radius-md:   0.75rem;
+  --radius-lg:   1rem;
+  --radius-pill: 999px;
+
+  --space-1: 0.375rem;
+  --space-2: 0.625rem;
+  --space-3: 0.875rem;
+  --space-4: 1.25rem;
+  --space-5: 1.75rem;
+  --space-6: 2.25rem;
+
+  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
+
+  color-scheme: dark;
+}