diff --git a/client_app/assets/fonts/BricolageGrotesque-Variable.ttf b/client_app/assets/fonts/BricolageGrotesque-Variable.ttf
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diff --git a/client_app/assets/fonts/JetBrainsMono-Variable.ttf b/client_app/assets/fonts/JetBrainsMono-Variable.ttf
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diff --git a/client_app/assets/fonts/Poppins-Bold.ttf b/client_app/assets/fonts/Poppins-Bold.ttf
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diff --git a/client_app/assets/fonts/Poppins-Medium.ttf b/client_app/assets/fonts/Poppins-Medium.ttf
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diff --git a/client_app/assets/fonts/Poppins-Regular.ttf b/client_app/assets/fonts/Poppins-Regular.ttf
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index 0000000..0bda228
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diff --git a/client_app/assets/fonts/Poppins-SemiBold.ttf b/client_app/assets/fonts/Poppins-SemiBold.ttf
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diff --git a/client_app/assets/fonts/README.md b/client_app/assets/fonts/README.md
new file mode 100644
index 0000000..5421108
--- /dev/null
+++ b/client_app/assets/fonts/README.md
@@ -0,0 +1,15 @@
+# HaloBestie font assets
+
+Stage 0 design-system fonts. All licensed under the SIL Open Font License.
+
+| File                              | Source |
+|-----------------------------------|--------|
+| `BricolageGrotesque-Variable.ttf` | https://github.com/google/fonts/tree/main/ofl/bricolagegrotesque |
+| `Poppins-Regular.ttf`             | https://github.com/google/fonts/tree/main/ofl/poppins |
+| `Poppins-Medium.ttf`              | https://github.com/google/fonts/tree/main/ofl/poppins |
+| `Poppins-SemiBold.ttf`            | https://github.com/google/fonts/tree/main/ofl/poppins |
+| `Poppins-Bold.ttf`                | https://github.com/google/fonts/tree/main/ofl/poppins |
+| `JetBrainsMono-Variable.ttf`      | https://github.com/google/fonts/tree/main/ofl/jetbrainsmono |
+
+Wired into `client_app/pubspec.yaml` and consumed via `HaloTokens.fontDisplay`,
+`fontBody`, `fontMono` in `client_app/lib/core/theme/halo_tokens.dart`.
diff --git a/client_app/lib/core/theme/_preview.dart b/client_app/lib/core/theme/_preview.dart
new file mode 100644
index 0000000..6cb52b9
--- /dev/null
+++ b/client_app/lib/core/theme/_preview.dart
@@ -0,0 +1,289 @@
+import 'package:flutter/material.dart';
+import 'halo_tokens.dart';
+import 'widgets/widgets.dart';
+
+const bool kThemePreviewEnabled = bool.fromEnvironment(
+  'THEME_PREVIEW',
+  defaultValue: false,
+);
+
+class ThemePreviewScreen extends StatefulWidget {
+  const ThemePreviewScreen({super.key});
+
+  @override
+  State<ThemePreviewScreen> createState() => _ThemePreviewScreenState();
+}
+
+class _ThemePreviewScreenState extends State<ThemePreviewScreen> {
+  final Set<String> _selectedChips = {'gak nyenyak'};
+  bool _disablePrimary = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final text = Theme.of(context).textTheme;
+    return Scaffold(
+      appBar: AppBar(title: const Text('Halo theme preview')),
+      body: ListView(
+        padding: const EdgeInsets.all(HaloSpacing.s20),
+        children: [
+          _section('Typography'),
+          Text('display large 36/700', style: text.displayLarge),
+          const SizedBox(height: HaloSpacing.s8),
+          Text('title large 22/700', style: text.titleLarge),
+          const SizedBox(height: HaloSpacing.s8),
+          Text(
+            'body medium 15/400 — Poppins',
+            style: text.bodyMedium,
+          ),
+          const SizedBox(height: HaloSpacing.s8),
+          Text(
+            'label small 10/600 — caption tracking',
+            style: text.labelSmall,
+          ),
+          _divider(),
+
+          _section('Color tokens'),
+          const Wrap(
+            spacing: HaloSpacing.s8,
+            runSpacing: HaloSpacing.s8,
+            children: [
+              _Swatch('brand', HaloTokens.brand),
+              _Swatch('brandDark', HaloTokens.brandDark),
+              _Swatch('brandSoft', HaloTokens.brandSoft),
+              _Swatch('accent', HaloTokens.accent),
+              _Swatch('mint', HaloTokens.mint),
+              _Swatch('lilac', HaloTokens.lilac),
+              _Swatch('success', HaloTokens.success),
+              _Swatch('danger', HaloTokens.danger),
+              _Swatch('ink', HaloTokens.ink, label: Colors.white),
+              _Swatch('inkSoft', HaloTokens.inkSoft, label: Colors.white),
+            ],
+          ),
+          _divider(),
+
+          _section('HaloButton'),
+          Wrap(
+            spacing: HaloSpacing.s8,
+            runSpacing: HaloSpacing.s8,
+            children: [
+              HaloButton(
+                label: 'primary md',
+                onPressed: _disablePrimary ? null : () {},
+              ),
+              HaloButton(
+                label: 'secondary',
+                variant: HaloButtonVariant.secondary,
+                onPressed: () {},
+              ),
+              HaloButton(
+                label: 'ghost',
+                variant: HaloButtonVariant.ghost,
+                onPressed: () {},
+              ),
+              HaloButton(
+                label: 'small',
+                size: HaloButtonSize.sm,
+                onPressed: () {},
+              ),
+              HaloButton(
+                label: 'large with icon',
+                size: HaloButtonSize.lg,
+                icon: const Icon(Icons.send_rounded),
+                onPressed: () {},
+              ),
+              const HaloButton(
+                label: 'disabled',
+                onPressed: null,
+              ),
+            ],
+          ),
+          const SizedBox(height: HaloSpacing.s12),
+          Row(
+            children: [
+              Switch(
+                value: _disablePrimary,
+                onChanged: (v) => setState(() => _disablePrimary = v),
+              ),
+              const Text('disable primary'),
+            ],
+          ),
+          _divider(),
+
+          _section('HaloOrb'),
+          Wrap(
+            spacing: HaloSpacing.s12,
+            runSpacing: HaloSpacing.s12,
+            children: List.generate(
+              6,
+              (i) => HaloOrb(seed: i, label: 'ABCDEF'[i]),
+            ),
+          ),
+          _divider(),
+
+          _section('HaloStepDots'),
+          for (int c = 1; c <= 4; c++) ...[
+            Padding(
+              padding: const EdgeInsets.only(bottom: HaloSpacing.s8),
+              child: HaloStepDots(total: 4, current: c),
+            ),
+          ],
+          _divider(),
+
+          _section('HaloChip (ESP-style multi-select)'),
+          Wrap(
+            spacing: HaloSpacing.s8,
+            runSpacing: HaloSpacing.s8,
+            children: [
+              for (final t in const [
+                'gak nyenyak',
+                'overthinking',
+                'putus',
+                'kerjaan',
+                'keluarga',
+                'sendiri',
+              ])
+                HaloChip(
+                  label: t,
+                  selected: _selectedChips.contains(t),
+                  onTap: () => setState(() {
+                    if (!_selectedChips.add(t)) _selectedChips.remove(t);
+                  }),
+                ),
+            ],
+          ),
+          _divider(),
+
+          _section('HaloBottomSheet / HaloPopup / HaloSnackbar'),
+          Wrap(
+            spacing: HaloSpacing.s8,
+            runSpacing: HaloSpacing.s8,
+            children: [
+              HaloButton(
+                label: 'show bottom sheet',
+                variant: HaloButtonVariant.secondary,
+                onPressed: () => HaloBottomSheet.show<void>(
+                  context,
+                  child: Column(
+                    mainAxisSize: MainAxisSize.min,
+                    crossAxisAlignment: CrossAxisAlignment.stretch,
+                    children: [
+                      Text('halo bestie', style: text.titleLarge),
+                      const SizedBox(height: HaloSpacing.s8),
+                      Text(
+                        'mau verif nomor dulu, atau ngobrol anonim?',
+                        style: text.bodyMedium,
+                      ),
+                      const SizedBox(height: HaloSpacing.s24),
+                      HaloButton(
+                        label: 'verif nomor',
+                        fullWidth: true,
+                        onPressed: () => Navigator.of(context).pop(),
+                      ),
+                      const SizedBox(height: HaloSpacing.s8),
+                      HaloButton(
+                        label: 'lanjut anonim',
+                        variant: HaloButtonVariant.ghost,
+                        fullWidth: true,
+                        onPressed: () => Navigator.of(context).pop(),
+                      ),
+                    ],
+                  ),
+                ),
+              ),
+              HaloButton(
+                label: 'show popup',
+                variant: HaloButtonVariant.secondary,
+                onPressed: () => HaloPopup.show<void>(
+                  context,
+                  title: 'verif lagi penuh',
+                  body: 'coba lagi nanti, atau lanjut tanpa verif aja.',
+                  icon: const Icon(
+                    Icons.lock_clock_rounded,
+                    size: 40,
+                    color: HaloTokens.brand,
+                  ),
+                  primary: HaloPopupAction(
+                    label: 'lanjut tanpa verif',
+                    onPressed: () {},
+                  ),
+                  secondary: HaloPopupAction(
+                    label: 'hubungi admin',
+                    onPressed: () {},
+                  ),
+                ),
+              ),
+              HaloButton(
+                label: 'show snackbar',
+                variant: HaloButtonVariant.secondary,
+                onPressed: () => HaloSnackbar.show(
+                  context,
+                  'sisa 3 menit lagi ya',
+                  icon: '⏳',
+                ),
+              ),
+            ],
+          ),
+          _divider(),
+
+          _section('Input'),
+          const TextField(
+            decoration: InputDecoration(
+              hintText: 'mau dipanggil apa?',
+              labelText: 'nama panggilan',
+            ),
+          ),
+          const SizedBox(height: HaloSpacing.s48),
+        ],
+      ),
+    );
+  }
+
+  Widget _section(String title) => Padding(
+        padding: const EdgeInsets.only(top: HaloSpacing.s16, bottom: HaloSpacing.s8),
+        child: Text(
+          title,
+          style: const TextStyle(
+            fontFamily: HaloTokens.fontDisplay,
+            fontSize: 18,
+            fontWeight: FontWeight.w700,
+            color: HaloTokens.brandDark,
+          ),
+        ),
+      );
+
+  Widget _divider() => const Padding(
+        padding: EdgeInsets.symmetric(vertical: HaloSpacing.s16),
+        child: Divider(),
+      );
+}
+
+class _Swatch extends StatelessWidget {
+  const _Swatch(this.name, this.color, {this.label = HaloTokens.ink});
+  final String name;
+  final Color color;
+  final Color label;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      width: 110,
+      height: 64,
+      padding: const EdgeInsets.all(HaloSpacing.s8),
+      alignment: Alignment.bottomLeft,
+      decoration: BoxDecoration(
+        color: color,
+        borderRadius: HaloRadius.md,
+        border: Border.all(color: HaloTokens.border),
+      ),
+      child: Text(
+        name,
+        style: TextStyle(
+          fontFamily: HaloTokens.fontBody,
+          fontSize: 12,
+          fontWeight: FontWeight.w600,
+          color: label,
+        ),
+      ),
+    );
+  }
+}
diff --git a/client_app/lib/core/theme/halo_theme.dart b/client_app/lib/core/theme/halo_theme.dart
new file mode 100644
index 0000000..edd037b
--- /dev/null
+++ b/client_app/lib/core/theme/halo_theme.dart
@@ -0,0 +1,316 @@
+import 'package:flutter/material.dart';
+import 'halo_tokens.dart';
+
+ThemeData haloThemeData() {
+  final base = ColorScheme.fromSeed(
+    seedColor: HaloTokens.brand,
+    brightness: Brightness.light,
+  );
+
+  final colorScheme = base.copyWith(
+    primary: HaloTokens.brand,
+    onPrimary: Colors.white,
+    primaryContainer: HaloTokens.brandSoft,
+    onPrimaryContainer: HaloTokens.brandDark,
+    secondary: HaloTokens.accent,
+    onSecondary: HaloTokens.ink,
+    secondaryContainer: HaloTokens.accentSoft,
+    onSecondaryContainer: HaloTokens.brandDark,
+    surface: HaloTokens.surface,
+    onSurface: HaloTokens.ink,
+    surfaceContainerHighest: HaloTokens.bg,
+    error: HaloTokens.danger,
+    onError: Colors.white,
+    outline: HaloTokens.border,
+  );
+
+  const textTheme = TextTheme(
+    displayLarge: TextStyle(
+      fontFamily: HaloTokens.fontDisplay,
+      fontSize: 36,
+      height: 40 / 36,
+      fontWeight: FontWeight.w700,
+      letterSpacing: -0.5,
+      color: HaloTokens.ink,
+    ),
+    displayMedium: TextStyle(
+      fontFamily: HaloTokens.fontDisplay,
+      fontSize: 30,
+      height: 34 / 30,
+      fontWeight: FontWeight.w700,
+      letterSpacing: -0.4,
+      color: HaloTokens.ink,
+    ),
+    displaySmall: TextStyle(
+      fontFamily: HaloTokens.fontDisplay,
+      fontSize: 26,
+      height: 30 / 26,
+      fontWeight: FontWeight.w700,
+      letterSpacing: -0.3,
+      color: HaloTokens.ink,
+    ),
+    headlineMedium: TextStyle(
+      fontFamily: HaloTokens.fontDisplay,
+      fontSize: 22,
+      height: 28 / 22,
+      fontWeight: FontWeight.w700,
+      color: HaloTokens.ink,
+    ),
+    titleLarge: TextStyle(
+      fontFamily: HaloTokens.fontDisplay,
+      fontSize: 22,
+      height: 28 / 22,
+      fontWeight: FontWeight.w700,
+      color: HaloTokens.ink,
+    ),
+    titleMedium: TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: 18,
+      height: 24 / 18,
+      fontWeight: FontWeight.w600,
+      color: HaloTokens.ink,
+    ),
+    titleSmall: TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: 15,
+      height: 22 / 15,
+      fontWeight: FontWeight.w600,
+      color: HaloTokens.ink,
+    ),
+    bodyLarge: TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: 16,
+      height: 24 / 16,
+      fontWeight: FontWeight.w400,
+      color: HaloTokens.ink,
+    ),
+    bodyMedium: TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: 15,
+      height: 22 / 15,
+      fontWeight: FontWeight.w400,
+      color: HaloTokens.ink,
+    ),
+    bodySmall: TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: 13,
+      height: 18 / 13,
+      fontWeight: FontWeight.w500,
+      color: HaloTokens.inkSoft,
+    ),
+    labelLarge: TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: 15,
+      height: 22 / 15,
+      fontWeight: FontWeight.w600,
+      color: HaloTokens.ink,
+    ),
+    labelMedium: TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: 12,
+      height: 16 / 12,
+      fontWeight: FontWeight.w500,
+      color: HaloTokens.inkSoft,
+    ),
+    labelSmall: TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: 10,
+      height: 14 / 10,
+      fontWeight: FontWeight.w600,
+      letterSpacing: 0.4,
+      color: HaloTokens.inkMuted,
+    ),
+  );
+
+  return ThemeData(
+    useMaterial3: true,
+    colorScheme: colorScheme,
+    scaffoldBackgroundColor: HaloTokens.bg,
+    textTheme: textTheme,
+    fontFamily: HaloTokens.fontBody,
+    appBarTheme: const AppBarTheme(
+      backgroundColor: HaloTokens.bg,
+      foregroundColor: HaloTokens.ink,
+      elevation: 0,
+      scrolledUnderElevation: 0,
+      centerTitle: false,
+      titleTextStyle: TextStyle(
+        fontFamily: HaloTokens.fontDisplay,
+        fontSize: 22,
+        height: 28 / 22,
+        fontWeight: FontWeight.w700,
+        color: HaloTokens.ink,
+      ),
+    ),
+    elevatedButtonTheme: ElevatedButtonThemeData(
+      style: ElevatedButton.styleFrom(
+        backgroundColor: HaloTokens.brand,
+        foregroundColor: Colors.white,
+        disabledBackgroundColor: HaloTokens.brandSoft,
+        disabledForegroundColor: HaloTokens.inkMuted,
+        elevation: 0,
+        shadowColor: const Color(0x59E17A9D),
+        padding: const EdgeInsets.symmetric(
+          horizontal: HaloSpacing.s24,
+          vertical: HaloSpacing.s16,
+        ),
+        shape: const RoundedRectangleBorder(borderRadius: HaloRadius.pill),
+        textStyle: const TextStyle(
+          fontFamily: HaloTokens.fontBody,
+          fontSize: 15,
+          fontWeight: FontWeight.w600,
+        ),
+      ),
+    ),
+    outlinedButtonTheme: OutlinedButtonThemeData(
+      style: OutlinedButton.styleFrom(
+        foregroundColor: HaloTokens.brandDark,
+        side: const BorderSide(color: HaloTokens.border),
+        padding: const EdgeInsets.symmetric(
+          horizontal: HaloSpacing.s24,
+          vertical: HaloSpacing.s16,
+        ),
+        shape: const RoundedRectangleBorder(borderRadius: HaloRadius.pill),
+        textStyle: const TextStyle(
+          fontFamily: HaloTokens.fontBody,
+          fontSize: 15,
+          fontWeight: FontWeight.w600,
+        ),
+      ),
+    ),
+    textButtonTheme: TextButtonThemeData(
+      style: TextButton.styleFrom(
+        foregroundColor: HaloTokens.brandDark,
+        padding: const EdgeInsets.symmetric(
+          horizontal: HaloSpacing.s16,
+          vertical: HaloSpacing.s12,
+        ),
+        shape: const RoundedRectangleBorder(borderRadius: HaloRadius.pill),
+        textStyle: const TextStyle(
+          fontFamily: HaloTokens.fontBody,
+          fontSize: 15,
+          fontWeight: FontWeight.w600,
+        ),
+      ),
+    ),
+    inputDecorationTheme: const InputDecorationTheme(
+      filled: true,
+      fillColor: HaloTokens.surface,
+      contentPadding: EdgeInsets.symmetric(
+        horizontal: HaloSpacing.s20,
+        vertical: HaloSpacing.s20,
+      ),
+      constraints: BoxConstraints(minHeight: 64),
+      hintStyle: TextStyle(
+        fontFamily: HaloTokens.fontBody,
+        fontSize: 15,
+        color: HaloTokens.inkMuted,
+      ),
+      labelStyle: TextStyle(
+        fontFamily: HaloTokens.fontBody,
+        fontSize: 13,
+        color: HaloTokens.inkSoft,
+      ),
+      border: OutlineInputBorder(
+        borderRadius: HaloRadius.lg,
+        borderSide: BorderSide(color: HaloTokens.border),
+      ),
+      enabledBorder: OutlineInputBorder(
+        borderRadius: HaloRadius.lg,
+        borderSide: BorderSide(color: HaloTokens.border),
+      ),
+      focusedBorder: OutlineInputBorder(
+        borderRadius: HaloRadius.lg,
+        borderSide: BorderSide(color: HaloTokens.brand, width: 2),
+      ),
+      errorBorder: OutlineInputBorder(
+        borderRadius: HaloRadius.lg,
+        borderSide: BorderSide(color: HaloTokens.danger),
+      ),
+      focusedErrorBorder: OutlineInputBorder(
+        borderRadius: HaloRadius.lg,
+        borderSide: BorderSide(color: HaloTokens.danger, width: 2),
+      ),
+    ),
+    bottomSheetTheme: const BottomSheetThemeData(
+      backgroundColor: HaloTokens.surface,
+      surfaceTintColor: HaloTokens.surface,
+      modalBackgroundColor: HaloTokens.surface,
+      modalBarrierColor: Color(0x66000000),
+      elevation: 0,
+      modalElevation: 0,
+      showDragHandle: true,
+      dragHandleColor: HaloTokens.brandSoft,
+      shape: RoundedRectangleBorder(
+        borderRadius: BorderRadius.only(
+          topLeft: Radius.circular(24),
+          topRight: Radius.circular(24),
+        ),
+      ),
+      clipBehavior: Clip.antiAlias,
+    ),
+    dialogTheme: const DialogThemeData(
+      backgroundColor: HaloTokens.surface,
+      surfaceTintColor: HaloTokens.surface,
+      elevation: 0,
+      shape: RoundedRectangleBorder(borderRadius: HaloRadius.xl),
+      titleTextStyle: TextStyle(
+        fontFamily: HaloTokens.fontDisplay,
+        fontSize: 22,
+        fontWeight: FontWeight.w700,
+        color: HaloTokens.ink,
+      ),
+      contentTextStyle: TextStyle(
+        fontFamily: HaloTokens.fontBody,
+        fontSize: 15,
+        height: 22 / 15,
+        color: HaloTokens.inkSoft,
+      ),
+    ),
+    snackBarTheme: const SnackBarThemeData(
+      behavior: SnackBarBehavior.floating,
+      backgroundColor: HaloTokens.ink,
+      contentTextStyle: TextStyle(
+        fontFamily: HaloTokens.fontBody,
+        fontSize: 14,
+        fontWeight: FontWeight.w500,
+        color: Colors.white,
+      ),
+      shape: RoundedRectangleBorder(borderRadius: HaloRadius.pill),
+      elevation: 4,
+      insetPadding: EdgeInsets.symmetric(
+        horizontal: HaloSpacing.s16,
+        vertical: HaloSpacing.s12,
+      ),
+      actionTextColor: HaloTokens.brandSoft,
+    ),
+    chipTheme: ChipThemeData(
+      backgroundColor: HaloTokens.surface,
+      selectedColor: HaloTokens.brand,
+      disabledColor: HaloTokens.brandSoft.withValues(alpha: 0.5),
+      labelStyle: const TextStyle(
+        fontFamily: HaloTokens.fontBody,
+        fontSize: 14,
+        fontWeight: FontWeight.w500,
+        color: HaloTokens.ink,
+      ),
+      secondaryLabelStyle: const TextStyle(
+        fontFamily: HaloTokens.fontBody,
+        fontSize: 14,
+        fontWeight: FontWeight.w500,
+        color: Colors.white,
+      ),
+      padding: const EdgeInsets.symmetric(
+        horizontal: HaloSpacing.s16,
+        vertical: HaloSpacing.s8,
+      ),
+      side: const BorderSide(color: HaloTokens.border),
+      shape: const RoundedRectangleBorder(borderRadius: HaloRadius.pill),
+    ),
+    dividerTheme: const DividerThemeData(
+      color: HaloTokens.border,
+      thickness: 1,
+      space: 1,
+    ),
+  );
+}
diff --git a/client_app/lib/core/theme/halo_tokens.dart b/client_app/lib/core/theme/halo_tokens.dart
new file mode 100644
index 0000000..7816880
--- /dev/null
+++ b/client_app/lib/core/theme/halo_tokens.dart
@@ -0,0 +1,129 @@
+import 'package:flutter/material.dart';
+
+/// Design tokens for the HaloBestie warm palette.
+///
+/// Mirrors `requirement/Figma/handoff/tokens.json`. Three palettes
+/// (warm/calm/playful) exist in the source-of-truth JSON; only `warm`
+/// ships in code today — the others are stubbed for phase 5.
+///
+/// Naming convention: every token prefixed with `Halo*` and grouped into
+/// purpose classes (`HaloTokens` for colors, `HaloSpacing`, `HaloRadius`,
+/// `HaloMotion`, `HaloShadows`).
+class HaloTokens {
+  const HaloTokens._();
+
+  // Warm palette — default.
+  static const Color bg = Color(0xFFFDF7F4);
+  static const Color surface = Color(0xFFFFFFFF);
+  static const Color ink = Color(0xFF2A1820);
+  static const Color inkSoft = Color(0xFF6B5560);
+  static const Color inkMuted = Color(0xFF9C8590);
+  static const Color brand = Color(0xFFE17A9D);
+  static const Color brandDark = Color(0xFF8C3255);
+  static const Color brandSoft = Color(0xFFF7E4E9);
+  static const Color brandSofter = Color(0xFFFBEFF3);
+  static const Color accent = Color(0xFFF7B26A);
+  static const Color accentSoft = Color(0xFFFCEAD3);
+  static const Color mint = Color(0xFFB8DBC8);
+  static const Color lilac = Color(0xFFD4C5E8);
+  static const Color success = Color(0xFF5BA67F);
+  static const Color danger = Color(0xFFD86B6B);
+  static const Color border = Color(0xFFF0E4E8);
+
+  // Font family names — must match the `family:` entries in pubspec.yaml.
+  // Falls back to system fonts when the .ttf assets are not bundled.
+  static const String fontDisplay = 'BricolageGrotesque';
+  static const String fontBody = 'Poppins';
+  static const String fontMono = 'JetBrainsMono';
+
+  // TODO: phase5 — calm palette
+  // static const Color calmBg = Color(0xFFF6F4F8);
+  // static const Color calmBrand = Color(0xFF9B8BC4);
+  // ...
+
+  // TODO: phase5 — playful palette
+  // static const Color playfulBg = Color(0xFFFFF5F8);
+  // static const Color playfulBrand = Color(0xFFFF69A0);
+  // ...
+}
+
+class HaloSpacing {
+  const HaloSpacing._();
+
+  static const double s0 = 0;
+  static const double s4 = 4;
+  static const double s8 = 8;
+  static const double s12 = 12;
+  static const double s16 = 16;
+  static const double s20 = 20;
+  static const double s24 = 24;
+  static const double s32 = 32;
+  static const double s40 = 40;
+  static const double s48 = 48;
+  static const double s64 = 64;
+  static const double s80 = 80;
+}
+
+class HaloRadius {
+  const HaloRadius._();
+
+  static const Radius _sm = Radius.circular(8);
+  static const Radius _md = Radius.circular(12);
+  static const Radius _lg = Radius.circular(16);
+  static const Radius _xl = Radius.circular(22);
+  static const Radius _pill = Radius.circular(9999);
+
+  static const BorderRadius sm = BorderRadius.all(_sm);
+  static const BorderRadius md = BorderRadius.all(_md);
+  static const BorderRadius lg = BorderRadius.all(_lg);
+  static const BorderRadius xl = BorderRadius.all(_xl);
+  static const BorderRadius pill = BorderRadius.all(_pill);
+}
+
+class HaloMotion {
+  const HaloMotion._();
+
+  static const Duration fast = Duration(milliseconds: 180);
+  static const Duration normal = Duration(milliseconds: 280);
+  static const Duration slow = Duration(milliseconds: 420);
+
+  static const Cubic ease = Cubic(0.2, 0.8, 0.2, 1);
+}
+
+class HaloShadows {
+  const HaloShadows._();
+
+  static const List<BoxShadow> soft = [
+    BoxShadow(
+      color: Color(0x0A8C3255),
+      offset: Offset(0, 1),
+      blurRadius: 2,
+    ),
+    BoxShadow(
+      color: Color(0x0F8C3255),
+      offset: Offset(0, 8),
+      blurRadius: 24,
+    ),
+  ];
+
+  static const List<BoxShadow> card = [
+    BoxShadow(
+      color: Color(0x0D8C3255),
+      offset: Offset(0, 2),
+      blurRadius: 6,
+    ),
+    BoxShadow(
+      color: Color(0x1A8C3255),
+      offset: Offset(0, 18),
+      blurRadius: 40,
+    ),
+  ];
+
+  static const List<BoxShadow> button = [
+    BoxShadow(
+      color: Color(0x59E17A9D),
+      offset: Offset(0, 4),
+      blurRadius: 14,
+    ),
+  ];
+}
diff --git a/client_app/lib/core/theme/widgets/halo_bottom_sheet.dart b/client_app/lib/core/theme/widgets/halo_bottom_sheet.dart
new file mode 100644
index 0000000..545d99b
--- /dev/null
+++ b/client_app/lib/core/theme/widgets/halo_bottom_sheet.dart
@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+import '../halo_tokens.dart';
+
+class HaloBottomSheet {
+  const HaloBottomSheet._();
+
+  static Future<T?> show<T>(
+    BuildContext context, {
+    required Widget child,
+    bool isDismissible = true,
+    bool enableDrag = true,
+    bool isScrollControlled = false,
+  }) {
+    return showModalBottomSheet<T>(
+      context: context,
+      isDismissible: isDismissible,
+      enableDrag: enableDrag,
+      isScrollControlled: isScrollControlled,
+      backgroundColor: HaloTokens.surface,
+      barrierColor: const Color(0x66000000),
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.only(
+          topLeft: Radius.circular(24),
+          topRight: Radius.circular(24),
+        ),
+      ),
+      showDragHandle: true,
+      builder: (ctx) => SafeArea(
+        top: false,
+        child: Padding(
+          padding: const EdgeInsets.fromLTRB(
+            HaloSpacing.s24,
+            HaloSpacing.s8,
+            HaloSpacing.s24,
+            HaloSpacing.s24,
+          ),
+          child: child,
+        ),
+      ),
+    );
+  }
+}
diff --git a/client_app/lib/core/theme/widgets/halo_button.dart b/client_app/lib/core/theme/widgets/halo_button.dart
new file mode 100644
index 0000000..65c5a9a
--- /dev/null
+++ b/client_app/lib/core/theme/widgets/halo_button.dart
@@ -0,0 +1,152 @@
+import 'package:flutter/material.dart';
+import '../halo_tokens.dart';
+
+enum HaloButtonVariant { primary, secondary, ghost }
+
+enum HaloButtonSize { sm, md, lg }
+
+class HaloButton extends StatelessWidget {
+  const HaloButton({
+    super.key,
+    required this.label,
+    required this.onPressed,
+    this.variant = HaloButtonVariant.primary,
+    this.size = HaloButtonSize.md,
+    this.icon,
+    this.fullWidth = false,
+  });
+
+  final String label;
+  final VoidCallback? onPressed;
+  final HaloButtonVariant variant;
+  final HaloButtonSize size;
+  final Widget? icon;
+  final bool fullWidth;
+
+  @override
+  Widget build(BuildContext context) {
+    final disabled = onPressed == null;
+    final padding = _padding();
+    final fontSize = _fontSize();
+    const shape = RoundedRectangleBorder(borderRadius: HaloRadius.pill);
+    final textStyle = TextStyle(
+      fontFamily: HaloTokens.fontBody,
+      fontSize: fontSize,
+      fontWeight: FontWeight.w600,
+    );
+
+    Widget child = _content(textStyle);
+
+    Widget button;
+    switch (variant) {
+      case HaloButtonVariant.primary:
+        button = Container(
+          decoration: disabled
+              ? null
+              : const BoxDecoration(
+                  borderRadius: HaloRadius.pill,
+                  boxShadow: HaloShadows.button,
+                ),
+          child: ElevatedButton(
+            onPressed: onPressed,
+            style: ElevatedButton.styleFrom(
+              backgroundColor: HaloTokens.brand,
+              foregroundColor: Colors.white,
+              disabledBackgroundColor: HaloTokens.brandSoft,
+              disabledForegroundColor: HaloTokens.inkMuted,
+              elevation: 0,
+              padding: padding,
+              shape: shape,
+              textStyle: textStyle,
+            ),
+            child: child,
+          ),
+        );
+        break;
+      case HaloButtonVariant.secondary:
+        button = OutlinedButton(
+          onPressed: onPressed,
+          style: OutlinedButton.styleFrom(
+            foregroundColor: HaloTokens.brandDark,
+            disabledForegroundColor: HaloTokens.inkMuted,
+            backgroundColor: HaloTokens.surface,
+            side: BorderSide(
+              color: disabled ? HaloTokens.border : HaloTokens.brandSoft,
+            ),
+            padding: padding,
+            shape: shape,
+            textStyle: textStyle,
+          ),
+          child: child,
+        );
+        break;
+      case HaloButtonVariant.ghost:
+        button = TextButton(
+          onPressed: onPressed,
+          style: TextButton.styleFrom(
+            foregroundColor: HaloTokens.brandDark,
+            disabledForegroundColor: HaloTokens.inkMuted,
+            padding: padding,
+            shape: shape,
+            textStyle: textStyle,
+          ),
+          child: child,
+        );
+        break;
+    }
+
+    if (fullWidth) {
+      return SizedBox(width: double.infinity, child: button);
+    }
+    return button;
+  }
+
+  Widget _content(TextStyle textStyle) {
+    if (icon == null) {
+      return Text(label, style: textStyle);
+    }
+    return Row(
+      mainAxisSize: MainAxisSize.min,
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: [
+        IconTheme(
+          data: IconThemeData(size: textStyle.fontSize! + 2),
+          child: icon!,
+        ),
+        const SizedBox(width: HaloSpacing.s8),
+        Text(label, style: textStyle),
+      ],
+    );
+  }
+
+  EdgeInsets _padding() {
+    switch (size) {
+      case HaloButtonSize.sm:
+        return const EdgeInsets.symmetric(
+          horizontal: HaloSpacing.s16,
+          vertical: HaloSpacing.s8,
+        );
+      case HaloButtonSize.md:
+        return const EdgeInsets.symmetric(
+          horizontal: HaloSpacing.s24,
+          vertical: HaloSpacing.s12,
+        );
+      case HaloButtonSize.lg:
+        return const EdgeInsets.symmetric(
+          horizontal: HaloSpacing.s32,
+          vertical: HaloSpacing.s16,
+        );
+    }
+  }
+
+  double _fontSize() {
+    switch (size) {
+      case HaloButtonSize.sm:
+        return 13;
+      case HaloButtonSize.md:
+        return 15;
+      case HaloButtonSize.lg:
+        return 16;
+    }
+  }
+}
diff --git a/client_app/lib/core/theme/widgets/halo_chip.dart b/client_app/lib/core/theme/widgets/halo_chip.dart
new file mode 100644
index 0000000..d6238cd
--- /dev/null
+++ b/client_app/lib/core/theme/widgets/halo_chip.dart
@@ -0,0 +1,75 @@
+import 'package:flutter/material.dart';
+import '../halo_tokens.dart';
+
+class HaloChip extends StatelessWidget {
+  const HaloChip({
+    super.key,
+    required this.label,
+    required this.selected,
+    required this.onTap,
+    this.icon,
+  });
+
+  final String label;
+  final bool selected;
+  final VoidCallback? onTap;
+  final Widget? icon;
+
+  @override
+  Widget build(BuildContext context) {
+    final disabled = onTap == null;
+    final bgColor = selected
+        ? HaloTokens.brand
+        : disabled
+            ? HaloTokens.brandSofter
+            : HaloTokens.surface;
+    final fgColor = selected
+        ? Colors.white
+        : disabled
+            ? HaloTokens.inkMuted
+            : HaloTokens.ink;
+    final borderColor = selected ? HaloTokens.brand : HaloTokens.border;
+
+    return Material(
+      color: bgColor,
+      borderRadius: HaloRadius.pill,
+      child: InkWell(
+        onTap: onTap,
+        borderRadius: HaloRadius.pill,
+        child: AnimatedContainer(
+          duration: HaloMotion.fast,
+          curve: HaloMotion.ease,
+          padding: const EdgeInsets.symmetric(
+            horizontal: HaloSpacing.s16,
+            vertical: HaloSpacing.s8,
+          ),
+          decoration: BoxDecoration(
+            border: Border.all(color: borderColor),
+            borderRadius: HaloRadius.pill,
+          ),
+          child: Row(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              if (icon != null) ...[
+                IconTheme(
+                  data: IconThemeData(size: 16, color: fgColor),
+                  child: icon!,
+                ),
+                const SizedBox(width: HaloSpacing.s8),
+              ],
+              Text(
+                label,
+                style: TextStyle(
+                  fontFamily: HaloTokens.fontBody,
+                  fontSize: 14,
+                  fontWeight: FontWeight.w500,
+                  color: fgColor,
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
diff --git a/client_app/lib/core/theme/widgets/halo_orb.dart b/client_app/lib/core/theme/widgets/halo_orb.dart
new file mode 100644
index 0000000..3ff68a9
--- /dev/null
+++ b/client_app/lib/core/theme/widgets/halo_orb.dart
@@ -0,0 +1,61 @@
+import 'package:flutter/material.dart';
+import '../halo_tokens.dart';
+
+/// A soft gradient circle used as an avatar/identity glyph.
+///
+/// `seed` deterministically picks a hue blend from the warm palette.
+class HaloOrb extends StatelessWidget {
+  const HaloOrb({
+    super.key,
+    required this.seed,
+    this.size = 64,
+    this.label,
+  });
+
+  final int seed;
+  final double size;
+  final String? label;
+
+  static const List<List<Color>> _gradients = [
+    [HaloTokens.brand, HaloTokens.brandDark],
+    [HaloTokens.accent, HaloTokens.brand],
+    [HaloTokens.lilac, HaloTokens.brand],
+    [HaloTokens.mint, HaloTokens.accent],
+    [HaloTokens.brandSoft, HaloTokens.brand],
+    [HaloTokens.accentSoft, HaloTokens.accent],
+  ];
+
+  @override
+  Widget build(BuildContext context) {
+    final colors = _gradients[seed.abs() % _gradients.length];
+    final initial = (label ?? '').isNotEmpty
+        ? label!.substring(0, 1).toUpperCase()
+        : null;
+
+    return Container(
+      width: size,
+      height: size,
+      decoration: BoxDecoration(
+        shape: BoxShape.circle,
+        gradient: LinearGradient(
+          colors: colors,
+          begin: Alignment.topLeft,
+          end: Alignment.bottomRight,
+        ),
+        boxShadow: HaloShadows.soft,
+      ),
+      alignment: Alignment.center,
+      child: initial == null
+          ? null
+          : Text(
+              initial,
+              style: TextStyle(
+                fontFamily: HaloTokens.fontDisplay,
+                fontSize: size * 0.42,
+                fontWeight: FontWeight.w700,
+                color: Colors.white,
+              ),
+            ),
+    );
+  }
+}
diff --git a/client_app/lib/core/theme/widgets/halo_popup.dart b/client_app/lib/core/theme/widgets/halo_popup.dart
new file mode 100644
index 0000000..7c721ef
--- /dev/null
+++ b/client_app/lib/core/theme/widgets/halo_popup.dart
@@ -0,0 +1,94 @@
+import 'package:flutter/material.dart';
+import '../halo_tokens.dart';
+import 'halo_button.dart';
+
+class HaloPopupAction {
+  const HaloPopupAction({required this.label, required this.onPressed});
+  final String label;
+  final VoidCallback onPressed;
+}
+
+class HaloPopup {
+  const HaloPopup._();
+
+  static Future<T?> show<T>(
+    BuildContext context, {
+    required String title,
+    String? body,
+    Widget? icon,
+    HaloPopupAction? primary,
+    HaloPopupAction? secondary,
+    bool barrierDismissible = true,
+  }) {
+    return showDialog<T>(
+      context: context,
+      barrierDismissible: barrierDismissible,
+      barrierColor: const Color(0x66000000),
+      builder: (ctx) => Dialog(
+        backgroundColor: HaloTokens.surface,
+        elevation: 0,
+        shape: const RoundedRectangleBorder(borderRadius: HaloRadius.xl),
+        insetPadding: const EdgeInsets.symmetric(horizontal: HaloSpacing.s24),
+        child: Padding(
+          padding: const EdgeInsets.all(HaloSpacing.s24),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              if (icon != null) ...[
+                Center(child: icon),
+                const SizedBox(height: HaloSpacing.s16),
+              ],
+              Text(
+                title,
+                style: const TextStyle(
+                  fontFamily: HaloTokens.fontDisplay,
+                  fontSize: 22,
+                  height: 28 / 22,
+                  fontWeight: FontWeight.w700,
+                  color: HaloTokens.ink,
+                ),
+                textAlign: TextAlign.center,
+              ),
+              if (body != null) ...[
+                const SizedBox(height: HaloSpacing.s12),
+                Text(
+                  body,
+                  style: const TextStyle(
+                    fontFamily: HaloTokens.fontBody,
+                    fontSize: 15,
+                    height: 22 / 15,
+                    color: HaloTokens.inkSoft,
+                  ),
+                  textAlign: TextAlign.center,
+                ),
+              ],
+              const SizedBox(height: HaloSpacing.s24),
+              if (primary != null)
+                HaloButton(
+                  label: primary.label,
+                  fullWidth: true,
+                  onPressed: () {
+                    Navigator.of(ctx).pop();
+                    primary.onPressed();
+                  },
+                ),
+              if (secondary != null) ...[
+                const SizedBox(height: HaloSpacing.s8),
+                HaloButton(
+                  label: secondary.label,
+                  variant: HaloButtonVariant.ghost,
+                  fullWidth: true,
+                  onPressed: () {
+                    Navigator.of(ctx).pop();
+                    secondary.onPressed();
+                  },
+                ),
+              ],
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
diff --git a/client_app/lib/core/theme/widgets/halo_snackbar.dart b/client_app/lib/core/theme/widgets/halo_snackbar.dart
new file mode 100644
index 0000000..cc7197b
--- /dev/null
+++ b/client_app/lib/core/theme/widgets/halo_snackbar.dart
@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+import '../halo_tokens.dart';
+
+class HaloSnackbar {
+  const HaloSnackbar._();
+
+  static void show(
+    BuildContext context,
+    String message, {
+    String? icon,
+    Duration duration = const Duration(seconds: 4),
+  }) {
+    final messenger = ScaffoldMessenger.maybeOf(context);
+    if (messenger == null) return;
+    messenger
+      ..hideCurrentSnackBar()
+      ..showSnackBar(
+        SnackBar(
+          duration: duration,
+          behavior: SnackBarBehavior.floating,
+          backgroundColor: HaloTokens.ink,
+          elevation: 4,
+          shape: const RoundedRectangleBorder(borderRadius: HaloRadius.pill),
+          margin: const EdgeInsets.symmetric(
+            horizontal: HaloSpacing.s16,
+            vertical: HaloSpacing.s12,
+          ),
+          padding: const EdgeInsets.symmetric(
+            horizontal: HaloSpacing.s20,
+            vertical: HaloSpacing.s12,
+          ),
+          content: Row(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              if (icon != null) ...[
+                Text(
+                  icon,
+                  style: const TextStyle(fontSize: 18),
+                ),
+                const SizedBox(width: HaloSpacing.s8),
+              ],
+              Flexible(
+                child: Text(
+                  message,
+                  style: const TextStyle(
+                    fontFamily: HaloTokens.fontBody,
+                    fontSize: 14,
+                    fontWeight: FontWeight.w500,
+                    color: Colors.white,
+                  ),
+                ),
+              ),
+            ],
+          ),
+        ),
+      );
+  }
+}
diff --git a/client_app/lib/core/theme/widgets/halo_step_dots.dart b/client_app/lib/core/theme/widgets/halo_step_dots.dart
new file mode 100644
index 0000000..34572b0
--- /dev/null
+++ b/client_app/lib/core/theme/widgets/halo_step_dots.dart
@@ -0,0 +1,43 @@
+import 'package:flutter/material.dart';
+import '../halo_tokens.dart';
+
+class HaloStepDots extends StatelessWidget {
+  const HaloStepDots({
+    super.key,
+    required this.total,
+    required this.current,
+  }) : assert(total > 0),
+       assert(current >= 1);
+
+  final int total;
+  final int current;
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      mainAxisSize: MainAxisSize.min,
+      children: List.generate(total, (index) {
+        final step = index + 1;
+        final active = step == current;
+        final past = step < current;
+        return Padding(
+          padding: EdgeInsets.only(right: index == total - 1 ? 0 : HaloSpacing.s8),
+          child: AnimatedContainer(
+            duration: HaloMotion.fast,
+            curve: HaloMotion.ease,
+            width: active ? 24 : 8,
+            height: 8,
+            decoration: BoxDecoration(
+              color: active
+                  ? HaloTokens.brand
+                  : past
+                      ? HaloTokens.brandSoft
+                      : HaloTokens.border,
+              borderRadius: HaloRadius.pill,
+            ),
+          ),
+        );
+      }),
+    );
+  }
+}
diff --git a/client_app/lib/core/theme/widgets/widgets.dart b/client_app/lib/core/theme/widgets/widgets.dart
new file mode 100644
index 0000000..62f5b85
--- /dev/null
+++ b/client_app/lib/core/theme/widgets/widgets.dart
@@ -0,0 +1,7 @@
+export 'halo_bottom_sheet.dart';
+export 'halo_button.dart';
+export 'halo_chip.dart';
+export 'halo_orb.dart';
+export 'halo_popup.dart';
+export 'halo_snackbar.dart';
+export 'halo_step_dots.dart';
diff --git a/client_app/lib/main.dart b/client_app/lib/main.dart
index dbcec72..9fe0ce7 100644
--- a/client_app/lib/main.dart
+++ b/client_app/lib/main.dart
@@ -7,6 +7,7 @@ import 'core/auth/auth_notifier.dart';
 import 'core/chat/active_session_notifier.dart';
 import 'core/chat/chat_notifier.dart';
 import 'core/notifications/notification_service.dart';
+import 'core/theme/halo_theme.dart';
 import 'firebase_options.dart';
 import 'router.dart';
 
@@ -83,6 +84,7 @@ class _AppState extends ConsumerState<App> {
 
     return MaterialApp.router(
       title: 'Halo Bestie',
+      theme: haloThemeData(),
       routerConfig: router,
     );
   }
diff --git a/client_app/lib/router.dart b/client_app/lib/router.dart
index 12bdb97..e188cf0 100644
--- a/client_app/lib/router.dart
+++ b/client_app/lib/router.dart
@@ -19,6 +19,7 @@ import 'features/chat/screens/chat_screen.dart';
 import 'features/chat/screens/chat_history_screen.dart';
 import 'features/chat/screens/chat_transcript_screen.dart';
 import 'features/payment/screens/payment_screen.dart';
+import 'core/theme/_preview.dart';
 
 class RouterNotifier extends ChangeNotifier {
   final Ref _ref;
@@ -47,9 +48,12 @@ GoRouter buildRouter(Ref ref) {
   final notifier = RouterNotifier(ref);
 
   return GoRouter(
-    initialLocation: '/splash',
+    initialLocation: kThemePreviewEnabled ? '/_theme_preview' : '/splash',
     refreshListenable: notifier,
     redirect: (context, state) {
+      // Theme preview is dev-only and intentionally bypasses auth + onboarding
+      // gates so it can be opened on any device build.
+      if (state.matchedLocation == '/_theme_preview') return null;
       final authState = ref.read(authProvider);
       final isSplash = state.matchedLocation == '/splash';
       final isOnboarding = state.matchedLocation == '/onboarding';
@@ -89,6 +93,8 @@ GoRouter buildRouter(Ref ref) {
       return null;
     },
     routes: [
+      if (kThemePreviewEnabled)
+        GoRoute(path: '/_theme_preview', builder: (_, __) => const ThemePreviewScreen()),
       GoRoute(path: '/splash', builder: (_, __) => const SplashScreen()),
       GoRoute(path: '/onboarding', builder: (_, __) => const OnboardingScreen()),
       GoRoute(path: '/welcome', builder: (_, __) => const WelcomeScreen()),
diff --git a/client_app/pubspec.yaml b/client_app/pubspec.yaml
index df19716..e80e5a2 100644
--- a/client_app/pubspec.yaml
+++ b/client_app/pubspec.yaml
@@ -52,3 +52,21 @@ flutter:
   assets:
     - assets/images/
     - assets/images/splash/
+    - assets/fonts/
+
+  fonts:
+    - family: BricolageGrotesque
+      fonts:
+        - asset: assets/fonts/BricolageGrotesque-Variable.ttf
+    - family: Poppins
+      fonts:
+        - asset: assets/fonts/Poppins-Regular.ttf
+        - asset: assets/fonts/Poppins-Medium.ttf
+          weight: 500
+        - asset: assets/fonts/Poppins-SemiBold.ttf
+          weight: 600
+        - asset: assets/fonts/Poppins-Bold.ttf
+          weight: 700
+    - family: JetBrainsMono
+      fonts:
+        - asset: assets/fonts/JetBrainsMono-Variable.ttf