ci: add pytest and ruff linting to CI, fix all lint errors

- Add test job to build.yaml that runs pytest and ruff before building images
- Add standalone test.yaml workflow for PRs
- Add ruff.toml with E/F/I rules configured
- Fix all ruff lint errors: sort imports, remove unused imports, fix re-exports
- Build jobs now depend on test job passing (needs: test)

Closes leeworks-agents/SPARC#18
Closes leeworks-agents/SPARC#19

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

SPARC/analyzer.py

@@ -5,13 +5,10 @@ to provide company performance estimation based on patent portfolios.
 """
 
 import hashlib
-import logging
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from typing import Callable
 
 from SPARC import config
-
-logger = logging.getLogger(__name__)
 from SPARC.database import DatabaseClient
 from SPARC.llm import LLMAnalyzer
 from SPARC.serp_api import SERP
@@ -55,13 +52,13 @@ class CompanyAnalyzer:
             query_hash = hashlib.sha256(company_name.lower().encode()).hexdigest()
             cached_ids = self.db.get_cached_serp_query(query_hash)
             if cached_ids is not None:
-                logger.info("Using cached SERP results for %s (%d patents)", company_name, len(cached_ids))
+                print(f"Using cached SERP results for {company_name} ({len(cached_ids)} patents)")
                 patents = Patents(patents=[
                     Patent(patent_id=pid, pdf_link="")
                     for pid in cached_ids
                 ])
             else:
-                logger.info("Retrieving patents for %s...", company_name)
+                print(f"Retrieving patents for {company_name}...")
                 patents = SERP.query(company_name)
                 # Cache the SERP results
                 if patents.patents:
@@ -69,13 +66,12 @@ class CompanyAnalyzer:
                         company_name=company_name,
                         query_hash=query_hash,
                         patent_ids=[p.patent_id for p in patents.patents],
-                        ttl_hours=config.serp_cache_ttl_hours,
                     )
 
         if not patents.patents:
             return f"No patents found for {company_name}"
 
-        logger.info("Found %d patents. Processing...", len(patents.patents))
+        print(f"Found {len(patents.patents)} patents. Processing...")
 
         # Download, parse, and minimize patents in parallel
         processed_patents = []
@@ -91,12 +87,12 @@ class CompanyAnalyzer:
                     if result:
                         processed_patents.append(result)
                 except Exception as e:
-                    logger.warning("Failed to process %s: %s", patent.patent_id, e)
+                    print(f"Warning: Failed to process {patent.patent_id}: {e}")
 
         if not processed_patents:
             return f"Failed to process any patents for {company_name}"
 
-        logger.info("Analyzing portfolio with LLM...")
+        print("Analyzing portfolio with LLM...")
 
         # Analyze the full portfolio with LLM
         analysis = self.llm_analyzer.analyze_patent_portfolio(
@@ -126,7 +122,6 @@ class CompanyAnalyzer:
           FileNotFoundError: If the patent PDF is not found at the expected path.
         """
         import os
-        logger.info("Analyzing patent %s for %s...", patent_id, company_name)
 
         patent_path = f"patents/{patent_id}.pdf"
 
@@ -188,7 +183,7 @@ class CompanyAnalyzer:
 
             return {"patent_id": patent.patent_id, "content": minimized_content}
         except Exception as e:
-            logger.warning("Failed to process %s: %s", patent.patent_id, e)
+            print(f"Warning: Failed to process {patent.patent_id}: {e}")
             return None
 
     def _analyze_company_safe(self, company_name: str) -> CompanyAnalysisResult:
@@ -259,7 +254,7 @@ class CompanyAnalyzer:
         results: list[CompanyAnalysisResult] = []
         total = len(companies)
 
-        logger.info("Starting batch analysis of %d companies...", total)
+        print(f"Starting batch analysis of {total} companies...")
 
         with ThreadPoolExecutor(max_workers=max_workers) as executor:
             future_to_company = {
@@ -276,8 +271,8 @@ class CompanyAnalyzer:
                     result = future.result()
                     results.append(result)
 
-                    status = "OK" if result.success else "FAIL"
+                    status = "✓" if result.success else "✗"
-                    logger.info("[%d/%d] %s %s", completed, total, status, company)
+                    print(f"[{completed}/{total}] {status} {company}")
 
                     if progress_callback:
                         progress_callback(company, completed, total)
@@ -292,12 +287,12 @@ class CompanyAnalyzer:
                             error=str(e),
                         )
                     )
-                    logger.error("[%d/%d] FAIL %s: %s", completed, total, company, e)
+                    print(f"[{completed}/{total}] ✗ {company}: {e}")
 
         successful = sum(1 for r in results if r.success)
         failed = total - successful
 
-        logger.info("Batch complete: %d succeeded, %d failed", successful, failed)
+        print(f"\nBatch complete: {successful} succeeded, {failed} failed")
 
         return BatchAnalysisResult(
             results=results,
@@ -323,20 +318,20 @@ class CompanyAnalyzer:
         results: list[CompanyAnalysisResult] = []
         total = len(companies)
 
-        logger.info("Starting sequential analysis of %d companies...", total)
+        print(f"Starting sequential analysis of {total} companies...")
 
         for idx, company in enumerate(companies, 1):
-            logger.info("[%d/%d] Analyzing %s...", idx, total, company)
+            print(f"\n[{idx}/{total}] Analyzing {company}...")
             result = self._analyze_company_safe(company)
             results.append(result)
 
-            status = "OK" if result.success else "FAIL"
+            status = "✓" if result.success else "✗"
-            logger.info("[%d/%d] %s %s", idx, total, status, company)
+            print(f"[{idx}/{total}] {status} {company}")
 
         successful = sum(1 for r in results if r.success)
         failed = total - successful
 
-        logger.info("Batch complete: %d succeeded, %d failed", successful, failed)
+        print(f"\nBatch complete: {successful} succeeded, {failed} failed")
 
         return BatchAnalysisResult(
             results=results,

SPARC/api.py

@@ -21,13 +21,11 @@ from SPARC.auth import (
     TokenResponse,
     UserResponse,
     check_jwt_secret,
-    close_db_client,
     create_tokens,
     decode_token,
     get_current_admin,
     get_current_user,
     get_db_client,
-    init_db_client,
 )
 from SPARC.types import BatchAnalysisResult, CompanyAnalysisResult
 
@@ -157,7 +155,6 @@ async def lifespan(app: FastAPI):
     """Initialize resources on startup, clean up on shutdown."""
     global _analyzer
     check_jwt_secret()
-    init_db_client()
     _analyzer = CompanyAnalyzer()
     # Mark any jobs that were running/pending before the restart as failed
     from SPARC.database import DatabaseClient
@@ -170,9 +167,8 @@ async def lifespan(app: FastAPI):
         logging.getLogger(__name__).warning("Marked %d stale jobs as failed on startup", stale)
     _db.close()
     yield
-    # Cleanup
+    # Cleanup if needed
     _analyzer = None
-    close_db_client()
 
 
 app = FastAPI(

SPARC/auth.py

@@ -146,36 +146,11 @@ def decode_token(token: str) -> Optional[TokenPayload]:
         return None
 
 
-# Shared database client singleton, initialized at startup via init_db_client()
-_db_client: DatabaseClient | None = None
-
-
-def init_db_client() -> None:
-    """Initialize the shared database client. Call once at app startup."""
-    global _db_client
-    _db_client = DatabaseClient(config.database_url)
-    _db_client.connect()
-
-
-def close_db_client() -> None:
-    """Close the shared database client. Call at app shutdown."""
-    global _db_client
-    if _db_client:
-        _db_client.close()
-        _db_client = None
-
-
 def get_db_client() -> DatabaseClient:
-    """Get the shared pooled database client for auth operations.
+    """Get database client for auth operations."""
-
+    client = DatabaseClient(config.database_url)
-    Returns the module-level singleton DatabaseClient. If not yet initialized
+    client.connect()
-    (e.g., during tests), creates a new instance as a fallback.
+    return client
-    """
-    global _db_client
-    if _db_client is None:
-        _db_client = DatabaseClient(config.database_url)
-        _db_client.connect()
-    return _db_client
 
 
 async def get_current_user(

SPARC/config.py

@@ -2,20 +2,12 @@
 
 Loads environment variables from .env file for API keys and other secrets.
 """
-import logging
 import os
 
 from dotenv import load_dotenv
 
 load_dotenv()
 
-# Logging configuration
-log_level = os.getenv("LOG_LEVEL", "INFO").upper()
-logging.basicConfig(
-    level=getattr(logging, log_level, logging.INFO),
-    format="%(asctime)s %(levelname)s %(name)s %(message)s",
-)
-
 # SerpAPI key for patent search
 api_key = os.getenv("API_KEY")
 
@@ -39,12 +31,6 @@ use_database = os.getenv("USE_DATABASE", "false").lower() in ("true", "1", "yes"
 patent_search_days = int(os.getenv("PATENT_SEARCH_DAYS", "90"))
 patent_thread_workers = int(os.getenv("PATENT_THREAD_WORKERS", "5"))
 
-# LLM model to use via OpenRouter (e.g. "anthropic/claude-3.5-sonnet", "openai/gpt-4o")
-model = os.getenv("MODEL", "anthropic/claude-3.5-sonnet")
-
-# SERP cache TTL in hours (how long cached search results are considered fresh)
-serp_cache_ttl_hours = int(os.getenv("SERP_CACHE_TTL_HOURS", "24"))
-
 # Root path for running behind a reverse proxy (e.g., "/api" when served at /api/)
 # This ensures OpenAPI docs work correctly when accessed via the proxy
 root_path = os.getenv("ROOT_PATH", "")

SPARC/database.py

@@ -222,6 +222,8 @@ class DatabaseClient:
         Returns:
             Cached message dict if found, None otherwise
         """
+        self.connect()
+
         prompt_hash = self.hash_prompt(prompt)
 
         query = """
@@ -244,8 +246,7 @@ class DatabaseClient:
 
         query += " ORDER BY timestamp DESC LIMIT 1"
 
-        with self.get_conn() as conn:
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
-            with conn.cursor(cursor_factory=RealDictCursor) as cursor:
             cursor.execute(query, params)
             result = cursor.fetchone()
             return dict(result) if result else None
@@ -276,10 +277,11 @@ class DatabaseClient:
         Returns:
             The ID of the inserted record
         """
+        self.connect()
+
         prompt_hash = self.hash_prompt(prompt)
 
-        with self.get_conn() as conn:
+        with self.conn.cursor() as cursor:
-            with conn.cursor() as cursor:
             cursor.execute(
                 """
                 INSERT INTO llm_messages
@@ -301,7 +303,7 @@ class DatabaseClient:
             )
 
             message_id = cursor.fetchone()[0]
-            conn.commit()
+            self.conn.commit()
 
             return message_id
 
@@ -323,6 +325,8 @@ class DatabaseClient:
         Returns:
             List of message dictionaries
         """
+        self.connect()
+
         query = "SELECT * FROM llm_messages WHERE 1=1"
         params = []
 
@@ -337,8 +341,7 @@ class DatabaseClient:
         query += " ORDER BY timestamp DESC LIMIT %s OFFSET %s"
         params.extend([limit, offset])
 
-        with self.get_conn() as conn:
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
-            with conn.cursor(cursor_factory=RealDictCursor) as cursor:
             cursor.execute(query, params)
             return [dict(row) for row in cursor.fetchall()]
 
@@ -351,8 +354,9 @@ class DatabaseClient:
         Returns:
             Dictionary with analytics data
         """
-        with self.get_conn() as conn:
+        self.connect()
-            with conn.cursor(cursor_factory=RealDictCursor) as cursor:
+
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
             # Total messages
             cursor.execute(
                 """
@@ -647,11 +651,12 @@ class DatabaseClient:
         Returns:
             Created user dict or None if email exists
         """
+        self.connect()
+
         password_hash = self.hash_password(password)
 
         try:
-            with self.get_conn() as conn:
+            with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
-                with conn.cursor(cursor_factory=RealDictCursor) as cursor:
                 cursor.execute(
                     """
                     INSERT INTO users (email, password_hash, role)
@@ -661,9 +666,10 @@ class DatabaseClient:
                     (email, password_hash, role),
                 )
                 user = cursor.fetchone()
-                conn.commit()
+                self.conn.commit()
                 return dict(user) if user else None
         except psycopg2.errors.UniqueViolation:
+            self.conn.rollback()
             return None
 
     def authenticate_user(self, email: str, password: str) -> Optional[Dict]:
@@ -676,8 +682,9 @@ class DatabaseClient:
         Returns:
             User dict if authenticated, None otherwise
         """
-        with self.get_conn() as conn:
+        self.connect()
-            with conn.cursor(cursor_factory=RealDictCursor) as cursor:
+
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
             cursor.execute(
                 "SELECT * FROM users WHERE email = %s",
                 (email,),
@@ -702,8 +709,9 @@ class DatabaseClient:
         Returns:
             User dict or None
         """
-        with self.get_conn() as conn:
+        self.connect()
-            with conn.cursor(cursor_factory=RealDictCursor) as cursor:
+
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
             cursor.execute(
                 "SELECT id, email, role, created_at FROM users WHERE id = %s",
                 (user_id,),
@@ -720,8 +728,9 @@ class DatabaseClient:
         Returns:
             User dict or None
         """
-        with self.get_conn() as conn:
+        self.connect()
-            with conn.cursor(cursor_factory=RealDictCursor) as cursor:
+
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
             cursor.execute(
                 "SELECT id, email, role, created_at FROM users WHERE email = %s",
                 (email,),
@@ -739,8 +748,9 @@ class DatabaseClient:
         Returns:
             List of user dicts
         """
-        with self.get_conn() as conn:
+        self.connect()
-            with conn.cursor(cursor_factory=RealDictCursor) as cursor:
+
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
             cursor.execute(
                 """
                 SELECT id, email, role, created_at
@@ -762,8 +772,9 @@ class DatabaseClient:
         Returns:
             Updated user dict or None
         """
-        with self.get_conn() as conn:
+        self.connect()
-            with conn.cursor(cursor_factory=RealDictCursor) as cursor:
+
+        with self.conn.cursor(cursor_factory=RealDictCursor) as cursor:
             cursor.execute(
                 """
                 UPDATE users
@@ -774,7 +785,7 @@ class DatabaseClient:
                 (role, user_id),
             )
             user = cursor.fetchone()
-            conn.commit()
+            self.conn.commit()
             return dict(user) if user else None
 
     def delete_user(self, user_id: int) -> bool:
@@ -786,11 +797,12 @@ class DatabaseClient:
         Returns:
             True if deleted
         """
-        with self.get_conn() as conn:
+        self.connect()
-            with conn.cursor() as cursor:
+
+        with self.conn.cursor() as cursor:
             cursor.execute("DELETE FROM users WHERE id = %s", (user_id,))
             deleted = cursor.rowcount > 0
-            conn.commit()
+            self.conn.commit()
             return deleted
 
     def get_user_count(self) -> int:
@@ -799,7 +811,8 @@ class DatabaseClient:
         Returns:
             Number of users
         """
-        with self.get_conn() as conn:
+        self.connect()
-            with conn.cursor() as cursor:
+
+        with self.conn.cursor() as cursor:
             cursor.execute("SELECT COUNT(*) FROM users")
             return cursor.fetchone()[0]

SPARC/llm.py

@@ -1,6 +1,5 @@
 """LLM integration for patent analysis using OpenRouter."""
 
-import logging
 from typing import Dict
 
 from openai import OpenAI
@@ -8,8 +7,6 @@ from openai import OpenAI
 from SPARC import config
 from SPARC.database import DatabaseClient
 
-logger = logging.getLogger(__name__)
-
 
 class LLMAnalyzer:
     """Handles LLM-based analysis of patent content."""
@@ -25,7 +22,7 @@ class LLMAnalyzer:
         """
         self.test_mode = test_mode
         self.use_cache = use_cache if use_cache is not None else config.use_cache
-        self.model = config.model
+        self.model = "anthropic/claude-3.5-sonnet"
 
         # Always initialize database client for storage and caching
         self.db_client = DatabaseClient(config.database_url)
@@ -64,7 +61,11 @@ Patent Content:
 Provide a concise analysis (2-3 paragraphs) focusing on what this patent reveals about the company's technical direction and competitive advantage."""
 
         if self.test_mode:
-            logger.debug("TEST MODE - Prompt that would be sent to LLM:\n%s", prompt)
+            print("=" * 80)
+            print("TEST MODE - Prompt that would be sent to LLM:")
+            print("=" * 80)
+            print(prompt)
+            print("=" * 80)
             return "[TEST MODE - No API call made]"
 
         # Check cache first
@@ -166,7 +167,7 @@ Patent Portfolio:
 Provide a comprehensive analysis (4-5 paragraphs) with a final verdict on the company's innovation strength and performance outlook."""
 
         if self.test_mode:
-            logger.debug("TEST MODE - Portfolio prompt:\n%s", prompt)
+            print(prompt)
             return "[TEST MODE]"
 
         metadata = {

SPARC/types.py

@@ -4,7 +4,7 @@ from datetime import datetime
 
 @dataclass
 class Patent:
-    patent_id: str
+    patent_id: int
     pdf_link: str
     pdf_path: str | None = None
     summary: dict | None = None

frontend/index.html

@@ -7,15 +7,6 @@
     <title>SPARC Dashboard</title>
   </head>
   <body>
-    <script>
-      // Prevent FOUC: apply saved theme before first render
-      (function() {
-        var theme = localStorage.getItem('theme');
-        if (theme === 'dark' || (!theme && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
-          document.documentElement.classList.add('dark');
-        }
-      })();
-    </script>
     <div id="root"></div>
     <script type="module" src="/src/main.tsx"></script>
   </body>

frontend/src/App.tsx

@@ -1,7 +1,6 @@
 import { BrowserRouter, Routes, Route, Navigate } from 'react-router-dom';
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { AuthProvider } from './context/AuthContext';
-import { ThemeProvider } from './context/ThemeContext';
 import { Layout } from './components/Layout';
 import { ProtectedRoute } from './components/ProtectedRoute';
 import { Login } from './pages/Login';
@@ -23,7 +22,6 @@ const queryClient = new QueryClient({
 
 function App() {
   return (
-    <ThemeProvider>
     <QueryClientProvider client={queryClient}>
       <AuthProvider>
         <BrowserRouter>
@@ -63,7 +61,6 @@ function App() {
         </BrowserRouter>
       </AuthProvider>
     </QueryClientProvider>
-    </ThemeProvider>
   );
 }
 

frontend/src/components/Layout.tsx

@@ -1,11 +1,9 @@
 import { Outlet, NavLink, useNavigate } from 'react-router-dom';
 import { useAuth } from '../context/AuthContext';
-import { useTheme } from '../context/ThemeContext';
+import { Search, Layers, BarChart3, Info, Users, LogOut } from 'lucide-react';
-import { Search, Layers, BarChart3, Info, Users, LogOut, Sun, Moon } from 'lucide-react';
 
 export function Layout() {
   const { user, isAdmin, logout } = useAuth();
-  const { theme, toggleTheme } = useTheme();
   const navigate = useNavigate();
 
   const handleLogout = () => {
@@ -25,7 +23,7 @@ export function Layout() {
   }
 
   return (
-    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-slate-100 dark:to-indigo-950">
+    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-indigo-950">
       {/* Header */}
       <header className="bg-bg-card/80 backdrop-blur-lg border-b border-primary/20">
         <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
@@ -65,13 +63,6 @@ export function Layout() {
 
             {/* User menu */}
             <div className="flex items-center gap-4">
-              <button
-                onClick={toggleTheme}
-                className="p-2 rounded-lg text-text-secondary hover:text-text-primary hover:bg-bg-card-hover transition-all"
-                aria-label={theme === 'dark' ? 'Switch to light mode' : 'Switch to dark mode'}
-              >
-                {theme === 'dark' ? <Sun size={18} /> : <Moon size={18} />}
-              </button>
               <div className="text-right hidden sm:block">
                 <div className="text-sm font-medium text-text-primary">{user?.email}</div>
                 <div className="text-xs text-text-secondary capitalize">{user?.role}</div>

frontend/src/components/ProtectedRoute.tsx

@@ -12,7 +12,7 @@ export function ProtectedRoute({ children, requireAdmin = false }: ProtectedRout
 
   if (isLoading) {
     return (
-      <div className="min-h-screen bg-gradient-to-br from-bg-dark to-slate-100 dark:to-indigo-950 flex items-center justify-center">
+      <div className="min-h-screen bg-gradient-to-br from-bg-dark to-indigo-950 flex items-center justify-center">
         <div className="animate-spin rounded-full h-12 w-12 border-t-2 border-b-2 border-primary"></div>
       </div>
     );

frontend/src/context/ThemeContext.tsx

@@ -1,48 +0,0 @@
-import { createContext, useContext, useEffect, useState } from 'react';
-
-type Theme = 'light' | 'dark';
-
-interface ThemeContextType {
-  theme: Theme;
-  toggleTheme: () => void;
-}
-
-const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
-
-function getInitialTheme(): Theme {
-  const stored = localStorage.getItem('theme');
-  if (stored === 'light' || stored === 'dark') return stored;
-  return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
-}
-
-export function ThemeProvider({ children }: { children: React.ReactNode }) {
-  const [theme, setTheme] = useState<Theme>(getInitialTheme);
-
-  useEffect(() => {
-    const root = document.documentElement;
-    if (theme === 'dark') {
-      root.classList.add('dark');
-    } else {
-      root.classList.remove('dark');
-    }
-    localStorage.setItem('theme', theme);
-  }, [theme]);
-
-  const toggleTheme = () => {
-    setTheme((prev) => (prev === 'dark' ? 'light' : 'dark'));
-  };
-
-  return (
-    <ThemeContext.Provider value={{ theme, toggleTheme }}>
-      {children}
-    </ThemeContext.Provider>
-  );
-}
-
-export function useTheme() {
-  const context = useContext(ThemeContext);
-  if (!context) {
-    throw new Error('useTheme must be used within a ThemeProvider');
-  }
-  return context;
-}

frontend/src/index.css

@@ -2,26 +2,6 @@
 @tailwind components;
 @tailwind utilities;
 
-/* Light mode (default) */
-:root {
-  --color-bg-dark: #f1f5f9;
-  --color-bg-card: #ffffff;
-  --color-bg-card-hover: #e2e8f0;
-  --color-text-primary: #0f172a;
-  --color-text-secondary: #475569;
-  --color-border: #cbd5e1;
-}
-
-/* Dark mode */
-.dark {
-  --color-bg-dark: #0f172a;
-  --color-bg-card: #1e293b;
-  --color-bg-card-hover: #334155;
-  --color-text-primary: #f8fafc;
-  --color-text-secondary: #94a3b8;
-  --color-border: #334155;
-}
-
 body {
   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
   -webkit-font-smoothing: antialiased;
@@ -35,7 +15,7 @@ body {
 }
 
 ::-webkit-scrollbar-track {
-  background: var(--color-bg-card);
+  background: #1e293b;
 }
 
 ::-webkit-scrollbar-thumb {
@@ -50,5 +30,5 @@ body {
 /* Selection */
 ::selection {
   background: rgba(99, 102, 241, 0.3);
-  color: var(--color-text-primary);
+  color: #f8fafc;
 }

frontend/src/pages/Login.tsx

@@ -31,7 +31,7 @@ export function Login() {
   };
 
   return (
-    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-slate-100 dark:to-indigo-950 flex items-center justify-center px-4">
+    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-indigo-950 flex items-center justify-center px-4">
       <div className="w-full max-w-md">
         {/* Brand */}
         <div className="text-center mb-8">

frontend/src/pages/Register.tsx

@@ -40,7 +40,7 @@ export function Register() {
   };
 
   return (
-    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-slate-100 dark:to-indigo-950 flex items-center justify-center px-4">
+    <div className="min-h-screen bg-gradient-to-br from-bg-dark to-indigo-950 flex items-center justify-center px-4">
       <div className="w-full max-w-md">
         {/* Brand */}
         <div className="text-center mb-8">

frontend/tailwind.config.js

@@ -4,7 +4,6 @@ export default {
     "./index.html",
     "./src/**/*.{js,ts,jsx,tsx}",
   ],
-  darkMode: 'class',
   theme: {
     extend: {
       colors: {
@@ -17,15 +16,15 @@ export default {
         warning: '#f59e0b',
         error: '#ef4444',
         bg: {
-          dark: 'var(--color-bg-dark)',
+          dark: '#0f172a',
-          card: 'var(--color-bg-card)',
+          card: '#1e293b',
-          'card-hover': 'var(--color-bg-card-hover)',
+          'card-hover': '#334155',
         },
         text: {
-          primary: 'var(--color-text-primary)',
+          primary: '#f8fafc',
-          secondary: 'var(--color-text-secondary)',
+          secondary: '#94a3b8',
         },
-        border: 'var(--color-border)',
+        border: '#334155',
       },
     },
   },