diff --git a/7project/frontend/src/appearance.ts b/7project/frontend/src/appearance.ts
new file mode 100644
index 0000000..2b14b99
--- /dev/null
+++ b/7project/frontend/src/appearance.ts
@@ -0,0 +1,39 @@
+export type Theme = 'system' | 'light' | 'dark';
+export type FontSize = 'small' | 'medium' | 'large';
+
+const THEME_KEY = 'app_theme';
+const FONT_KEY = 'app_font_size';
+
+export function applyTheme(theme: Theme) {
+  const root = document.documentElement;
+  const body = document.body;
+  const effective = theme === 'system' ? (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light') : theme;
+  body.setAttribute('data-theme', effective);
+}
+
+export function applyFontSize(size: FontSize) {
+  const root = document.documentElement;
+  const map: Record<FontSize, string> = {
+    small: '14px',
+    medium: '16px',
+    large: '18px',
+  };
+  root.style.fontSize = map[size];
+}
+
+export function saveAppearance(theme: Theme, size: FontSize) {
+  localStorage.setItem(THEME_KEY, theme);
+  localStorage.setItem(FONT_KEY, size);
+}
+
+export function loadAppearance(): { theme: Theme; size: FontSize } {
+  const theme = (localStorage.getItem(THEME_KEY) as Theme) || 'light';
+  const size = (localStorage.getItem(FONT_KEY) as FontSize) || 'medium';
+  return { theme, size };
+}
+
+export function applyAppearanceFromStorage() {
+  const { theme, size } = loadAppearance();
+  applyTheme(theme);
+  applyFontSize(size);
+}
diff --git a/7project/frontend/src/pages/AccountPage.tsx b/7project/frontend/src/pages/AccountPage.tsx
new file mode 100644
index 0000000..c31804f
--- /dev/null
+++ b/7project/frontend/src/pages/AccountPage.tsx
@@ -0,0 +1,87 @@
+import { useEffect, useState } from 'react';
+import { deleteMe, getMe, type UpdateMeInput, type User, updateMe } from '../api';
+
+export default function AccountPage({ onDeleted }: { onDeleted: () => void }) {
+  const [user, setUser] = useState<User | null>(null);
+  const [firstName, setFirstName] = useState('');
+  const [lastName, setLastName] = useState('');
+  const [loading, setLoading] = useState(true);
+  const [saving, setSaving] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    (async () => {
+      try {
+        const u = await getMe();
+        setUser(u);
+        setFirstName(u.first_name || '');
+        setLastName(u.last_name || '');
+      } catch (e: any) {
+        setError(e?.message || 'Failed to load account');
+      } finally {
+        setLoading(false);
+      }
+    })();
+  }, []);
+
+  async function handleSave(e: React.FormEvent) {
+    e.preventDefault();
+    setSaving(true);
+    setError(null);
+    try {
+      const payload: UpdateMeInput = { first_name: firstName || null as any, last_name: lastName || null as any };
+      const updated = await updateMe(payload);
+      setUser(updated);
+    } catch (e: any) {
+      setError(e?.message || 'Failed to update');
+    } finally {
+      setSaving(false);
+    }
+  }
+
+  async function handleDelete() {
+    if (!confirm('Are you sure you want to delete your account? This cannot be undone.')) return;
+    try {
+      await deleteMe();
+      onDeleted();
+    } catch (e: any) {
+      alert(e?.message || 'Failed to delete account');
+    }
+  }
+
+  return (
+    <section className="card">
+      <h3>Account</h3>
+      {loading ? (
+        <div>Loading…</div>
+      ) : error ? (
+        <div style={{ color: 'crimson' }}>{error}</div>
+      ) : !user ? (
+        <div>Not signed in</div>
+      ) : (
+        <div className="space-y">
+          <div className="muted">Email: <strong>{user.email}</strong></div>
+          <form onSubmit={handleSave} className="space-y">
+            <div className="form-row">
+              <div>
+                <label className="muted">First name</label>
+                <input className="input" value={firstName} onChange={(e) => setFirstName(e.target.value)} />
+              </div>
+              <div>
+                <label className="muted">Last name</label>
+                <input className="input" value={lastName} onChange={(e) => setLastName(e.target.value)} />
+              </div>
+            </div>
+            <div className="actions" style={{ justifyContent: 'flex-end' }}>
+              <button className="btn primary" type="submit" disabled={saving}>{saving ? 'Saving…' : 'Save changes'}</button>
+            </div>
+          </form>
+          <div className="actions" style={{ justifyContent: 'space-between' }}>
+            <div className="muted"></div>
+            <button className="btn" style={{ borderColor: 'crimson', color: 'crimson' }} onClick={handleDelete}>Delete account</button>
+          </div>
+        </div>
+      )}
+    </section>
+  );
+}
diff --git a/7project/frontend/src/pages/AppearancePage.tsx b/7project/frontend/src/pages/AppearancePage.tsx
new file mode 100644
index 0000000..3aeaa1f
--- /dev/null
+++ b/7project/frontend/src/pages/AppearancePage.tsx
@@ -0,0 +1,49 @@
+import { useEffect, useState } from 'react';
+import { applyFontSize, applyTheme, loadAppearance, saveAppearance, type FontSize, type Theme } from '../appearance';
+
+export default function AppearancePage() {
+  const [theme, setTheme] = useState<Theme>('light');
+  const [size, setSize] = useState<FontSize>('medium');
+
+  useEffect(() => {
+    const { theme, size } = loadAppearance();
+    setTheme(theme);
+    setSize(size);
+  }, []);
+
+  function onThemeChange(next: Theme) {
+    setTheme(next);
+    applyTheme(next);
+    saveAppearance(next, size);
+  }
+
+  function onSizeChange(next: FontSize) {
+    setSize(next);
+    applyFontSize(next);
+    saveAppearance(theme, next);
+  }
+
+  return (
+    <section className="card">
+      <h3>Appearance</h3>
+      <div className="space-y">
+        <div>
+          <div className="muted" style={{ marginBottom: 6 }}>Theme</div>
+          <div className="segmented">
+            <button className={theme === 'light' ? 'active' : ''} onClick={() => onThemeChange('light')}>Light</button>
+            <button className={theme === 'dark' ? 'active' : ''} onClick={() => onThemeChange('dark')}>Dark</button>
+            <button className={theme === 'system' ? 'active' : ''} onClick={() => onThemeChange('system')}>System</button>
+          </div>
+        </div>
+        <div>
+          <div className="muted" style={{ marginBottom: 6 }}>Font size</div>
+          <div className="segmented">
+            <button className={size === 'small' ? 'active' : ''} onClick={() => onSizeChange('small')}>Small</button>
+            <button className={size === 'medium' ? 'active' : ''} onClick={() => onSizeChange('medium')}>Medium</button>
+            <button className={size === 'large' ? 'active' : ''} onClick={() => onSizeChange('large')}>Large</button>
+          </div>
+        </div>
+      </div>
+    </section>
+  );
+}
diff --git a/7project/frontend/src/ui.css b/7project/frontend/src/ui.css
new file mode 100644
index 0000000..ec6092f
--- /dev/null
+++ b/7project/frontend/src/ui.css
@@ -0,0 +1,85 @@
+:root {
+  --bg: #f7f7fb;
+  --panel: #ffffff;
+  --text: #9aa3b2;
+  --muted: #6b7280;
+  --primary: #6f49fe;
+  --primary-600: #5a37fb;
+  --border: #e5e7eb;
+  --radius: 12px;
+  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.08);
+
+  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
+  color: var(--text);
+}
+
+* { box-sizing: border-box; }
+
+html, body, #root { height: 100%; }
+
+body { background: var(--bg); margin: 0; display: block; }
+
+/* Dark theme variables */
+body[data-theme="dark"] {
+  --bg: #161a2b;
+  --panel: #283046;
+  --text: #283046;
+  --muted: #cbd5e1;
+  --primary: #8b7bff;
+  --primary-600: #7b69ff;
+  --border: #283046;
+}
+
+/* Layout */
+.app-layout { display: grid; grid-template-columns: 260px 1fr; height: 100%; }
+.sidebar { background: #15172a; color: #e5e7eb; display: flex; flex-direction: column; padding: 20px 12px; }
+.sidebar .logo { color: #fff; font-weight: 700; font-size: 18px; padding: 12px 14px; display: flex; align-items: center; gap: 10px; }
+.nav { margin-top: 12px; display: grid; gap: 4px; }
+.nav a, .nav button { color: #cbd5e1; text-align: left; background: transparent; border: 0; padding: 10px 12px; border-radius: 8px; cursor: pointer; }
+.nav a.active, .nav a:hover, .nav button:hover { background: rgba(255,255,255,0.08); color: #fff; }
+
+.content { display: flex; flex-direction: column; height: 100%; }
+.topbar { height: 64px; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; background: var(--panel); border-bottom: 1px solid var(--border); }
+.topbar .user { color: var(--muted); }
+.page { padding: 24px; max-width: 1100px; margin: auto; }
+
+/* Cards */
+.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; }
+.card h3 { margin: 0 0 12px; }
+
+/* Forms */
+.input, select, textarea { width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: #fff; color: var(--text); }
+.input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); border-color: var(--primary); }
+.form-row { display: grid; gap: 8px; grid-template-columns: repeat(4, minmax(0,1fr)); }
+.form-row > * { min-width: 140px; }
+.actions { display: flex; align-items: center; gap: 8px; }
+
+/* Buttons */
+.btn { border: 1px solid var(--border); background: #fff; color: var(--text); padding: 10px 14px; border-radius: 10px; cursor: pointer; }
+.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
+.btn.primary:hover { background: var(--primary-600); }
+.btn.ghost { background: transparent; color: var(--muted); }
+
+/* Tables */
+.table { width: 100%; border-collapse: collapse; }
+.table th, .table td { padding: 10px; border-bottom: 1px solid var(--border); }
+.table th { text-align: left; color: var(--muted); font-weight: 600; }
+.table td.amount { text-align: right; font-variant-numeric: tabular-nums; }
+
+/* Segmented control */
+.segmented { display: inline-flex; background: #f1f5f9; border-radius: 10px; padding: 4px; border: 1px solid var(--border); }
+.segmented button { border: 0; background: transparent; padding: 8px 12px; border-radius: 8px; color: var(--muted); cursor: pointer; }
+.segmented button.active { background: #fff; color: var(--text); box-shadow: var(--shadow); }
+
+/* Auth layout */
+body.auth-page #root {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-height: 100vh;
+  width: 100%;
+}
+
+/* Utility */
+.muted { color: var(--muted); }
+.space-y > * + * { margin-top: 12px; }